The World of Ham Radio CD-ROM From Unknown Fri Jan 05 12:35:23 1996 Path: news.epix.net!news.sprintlink.net!news1.cris.com!news From: tcmedlin@cris.com Newsgroups: rec.radio.amateur.homebrew Subject: Need VTO's Date: 1 Jan 1996 01:48:03 GMT Organization: Concentric Internet Services Lines: 13 Message-ID: <4c7egj$n3h@spectator.cris.com> NNTP-Posting-Host: cnc086036.concentric.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2 (Windows; U; 16bit) Does anyone know where i can find some inexpensive voltage tuned osc's? I have built several shortwave receiving converters to be used with the car radio. these have used crystals to date but i want to substitute the vto"s. vto's need to have outputs around 4-6 mhz, 6-8 mhz, etc or possibly a single one that would tune maybe 4-15 mhz or so. i am using a simple conversion and mixing this so output is connected to the car radios antenna and it is tuned to around 1000 khz. the mixer is either a simple transistor or the ne-602. thanks, Tom Medlin, WA5KUB email: tcmedlin@cris.com From Unknown Fri Jan 05 12:35:24 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!torn!dns.humberc.on.ca!westonia!ppp-16 From: joe@westonia.com (Joseph Cooper) Subject: Heathkit Active Antenna X-Nntp-Posting-Host: ppp-16.ppp.westonia.com Message-ID: Sender: news@westonia.com Organization: Westonia X-Newsreader: News Xpress Version 1.0 Beta #3 Date: Mon, 1 Jan 1996 01:58:23 GMT Lines: 14 I am repairing a Heathkit Active Antenna model HGD-1424-A I need the replacement part numbers for the MOSFET and Transistor 417-290 MOSFET 417-931 Transistor Thanks in Advance * Joseph Cooper:-VE3FMQ-QTH-East York-near Toronto Ontario Canada * * Interests are:- BCB and VLF Radio-Woodworking-Steam Railroads - * * -Nikola Tesla-Antique Radios-Crystal Radios-Travel-Burmese Cats * * FAX (416) 423-7782 9:00pm to 5:00pm EDST Monday To Friday Only * From Unknown Fri Jan 05 12:35:25 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!news.duke.edu!newshost.convex.com!news.onramp.net!usenet From: wayne ashcraft Newsgroups: rec.radio.amateur.homebrew Subject: Re: Mods for the Yaesu FRG-7 receiver needed Date: 1 Jan 1996 04:04:01 GMT Organization: On-Ramp; Individual Internet Connections; Dallas/Ft Worth/Houston, TX USA Lines: 6 Message-ID: <4c7mfi$f5o@news.onramp.net> References: <4c43sa$9m9@ddi2.digital.net> NNTP-Posting-Host: dal35.onramp.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) To: russ@gslink.net You might want to try the radio mod section on my web page. I have three links there that might help. Look under AMATEUR RADIO section,radio mods at . wayne////N5UDE From Unknown Fri Jan 05 12:35:26 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!lll-winken.llnl.gov!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.sas.ab.ca!fn1.freenet.edmonton.ab.ca!mwilde From: mwilde@fn1.freenet.edmonton.ab.ca () Newsgroups: rec.radio.amateur.homebrew Subject: NUTS AND BOLTS Date: 1 Jan 1996 07:49:09 GMT Organization: Edmonton Freenet, Edmonton, Alberta, Canada Lines: 14 Message-ID: <4c83ll$h27@news.sas.ab.ca> NNTP-Posting-Host: fn1.freenet.edmonton.ab.ca X-Newsreader: TIN [version 1.2 PL2.3] I saw a posting that referenced a magazine or store (not sure what exactly) with the name Nuts and Bolts. The reference was with Electronic Test Equipment. If anyone knows who they are and where I can find out more about them I would appreciate knowing. Please reply to my email (unless you think everyone would bennefit) 73's VE6MML -- M WILDE email: mwilde@freenet.edmonton.ab.ca 7708 181 STREET phone: 403-481-4756 EDMONTON, AB, T5T 1Z7 From Unknown Fri Jan 05 12:35:27 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!jmatk.tiac.net!user From: jmatk@tscm.com (James M. Atkinson, Communications Engineer) Newsgroups: alt.law-enforcement,rec.radio.scanner,rec.radio.shortwave,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew Subject: TSCM Counter Surveillance, Privacy, & Security Page Date: Mon, 01 Jan 1996 08:43:00 -0500 Organization: tscm.com Lines: 10 Message-ID: Reply-To: jmatk@tscm.com NNTP-Posting-Host: jmatk.tiac.net Keywords: Security Counterintelligence Debugging Surviellance Wiretap X-Newsreader: Yet Another NewsWatcher 2.1.3 Xref: news.epix.net alt.law-enforcement:40324 rec.radio.scanner:42966 rec.radio.shortwave:68249 rec.radio.amateur.digital.misc:13425 rec.radio.amateur.homebrew:12483 Happy New Year!!!!! TSCM, Counter Surveillance and Debugging Page new materials... Check it out... http://www.tscm.com/ Large section on TSCM test equipment Large section on TSCM training and career paths - James M. Atkinson "...shaken, not stirred" From Unknown Fri Jan 05 12:35:27 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!aegis.nitco.com!moe16 From: jrsmith@nitco.com (James R. Smith) Newsgroups: rec.radio.amateur.homebrew Subject: Scheduler With Output Function Date: Mon, 01 Jan 96 10:19:43 GMT Organization: Northwest Indiana Telephone Company Lines: 9 Message-ID: <4c7r6h$r2v@aegis.nitco.com> NNTP-Posting-Host: moe16.nitco.com X-Newsreader: News Xpress Version 1.0 Beta #4 I would like to know if the Creative Labs Soundblaster card, along with Scheduler, can be equipped with an output function. You know, to turn something on and off with. If not, do you know where I can obtain such a card and software? Thanks Jim From Unknown Fri Jan 05 12:35:29 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!ifwtech.demon.co.uk From: Ian G3SEK Newsgroups: rec.radio.amateur.homebrew Subject: Re: silver plating, help Date: Mon, 01 Jan 1996 10:55:39 +0000 Organization: IFWtech Lines: 79 Message-ID: <642326134wnr@ifwtech.demon.co.uk> References: <4c6na7$68j@ren.cei.net> Reply-To: G3SEK@ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk X-Newsreader: Newswin Alpha 0.9.1 X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!ifwtech.demon.co.uk In article: <4c6na7$68j@ren.cei.net> dallen@cei.net (Allen Finne) writes: : I dimly remember reading an article once describing the use of exhausted : black and white photographic fixer as the electrolyte for silver plating. : I do a bit of photograhy and have old fixer available. The fact I can't : find the article only made me determined to figure out what the method : outlined was. I have played around a bit and found that I can sucessfully : deposit a nice even coat of silver on a piece of brass. My problem is : mixed results getting the silver to adhere well. I have managed to get : what I'd consider proper plating on an object, but later using the same : parameters the silver film can be rubbed off. I have played with varying : voltages, currents, and methods of cleaning the brass prior to plating. : Here are the parameters I'm using: : 1) Voltage source is a 1.5v dry cell. : 2) Series resistance of 12k in circuit giving a current flow of 1 : milliamp or so. : 3) Fixer saturated by loading it up with old photographic paper prior to : plating. : 4) Silver donor is an old piece of solid silver silverware. : 5) Cleaning the brass with a scotch-brite pad then wiping down with : alcohol to de-grease. The article was "Safe, Sensible Silverplating" by J S Gurske, K9EYY in 'Ham Radio', February 1985. It works very well for copper and brass. The main feature of K9EYY's method is that it doesn't use a conventional bath of electrolyte. The plating is applied using electrolyte soaked into a sponge which is tied onto the end of a carbon rod. The rod is connected to the positive supply and the metal to be plated is connected to the negative. The plating is then "rubbed on" using the sponge. If the work-piece is really clean, the silver goes on easily to any desired thickness until the electrolyte is depleted. Then you re-soak the sponge with fresh electrolyte and carry on. The most important electrical parameter is the current. K9EYY used 50mA from a 6V battery in series with a 10k pot. He specifically warns against using lower currents because the plating does not adhere reliably. For the same reason, do not allow the sponge to touch the work-piece without the power supply connected. The rubbing action helps to consolidate the coating. The harder you rub, the better the plating seems to be. Obviously you need a drip tray to catch the electrolyte as it runs off the work-piece, but there is no need for an assortment of plating baths of special shapes and sizes. This is a huge advantage if your main hobby is amateur radio, not amateur electroplating! You can also save silver by plating the inside of coaxial cavities etc but not the outside. To plate the inside of a long tube, connect the carbon rod to an insulated wire, and tape the rod onto a stick. It is important to waterproof any bare copper connections, to avoid creating unwanted electrolytic cells. K9EYY also describes how to regenerate the used electrolyte by dipping the carbon rod into the container and using some silver item as the anode (connections reversed, current 75mA). If anybody in Continental Europe is reading this, the same electroplating technique works even better using the "Anreibe-Silber" mixture which you can buy at hamfests in Germany. This proprietary mixture is a tamer version of the cyanide solutions that the professionals use, so although the quality of plating is excellent I would not recommend it for anybody who is not trained in chemical laboratory techniques. Unfortunately neither of these processes will plate over tin-lead solder without an electrolytic pre-treatment using cyanide solutions. You have to either use hard solder or plate the individual parts before assembly. Hope this helps, Allen - happy plating! -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From Unknown Fri Jan 05 12:35:30 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: lrware@aol.com (Lrware) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NUTS AND BOLTS Date: 1 Jan 1996 11:31:15 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 6 Sender: root@newsbf02.news.aol.com Message-ID: <4c928j$p19@newsbf02.news.aol.com> References: <4c83ll$h27@news.sas.ab.ca> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi: It's called "Nuts & Volts" Subscriptions at: 1-800-783-4624 BTW: I like it a lot, good deals on suplus, and some good tech. articles.. -larry From Unknown Fri Jan 05 12:35:31 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!prodigy.com!usenet From: TSJV87A@prodigy.com (Ernest Hansen) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NUTS AND BOLTS Date: 1 Jan 1996 14:49:08 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 12 Distribution: world Message-ID: <4c8s94$ld8@usenetp1.news.prodigy.com> References: <4c83ll$h27@news.sas.ab.ca> NNTP-Posting-Host: inugap4.news.prodigy.com X-Newsreader: Version 1.2 First, I have no connection with the magazine other than to enjoy reading it once in a while. It is published monthly by T & L Publications, Inc. 430 Princeland Court, Corona, Ca 91719 Pnone 909-371-8497 Fax 909-371- 3052 Internet Address 74262.3664@compuserve.com Subscription line 1-800-783-4624 Hope this helps you. They send me a free copy about once a year. I enjoy receiving it to the point that I am concidering subscribing. Ernie Hansen, K3VVV, tsjv87a@prodigy.com From Unknown Fri Jan 05 12:35:33 1996 Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!caen!news.umass.edu!news.hampshire.edu!hamp!aswNS From: aswNS@hamp.hampshire.edu (4) Subject: Re: Atlas 210X power output Question Message-ID: <117cc$9351.1c3@news.hampshire.edu> Date: Mon, 01 Jan 1996 14:53:01 GMT FollowUp: rec.radio.amateur.equipment,rec.radio.amateur.homebrew References: <4bsigj$o4j@vista.hevanet.com> Organization: Hampshire College, Amherst MA X-Newsreader: TIN [version 1.2 PL2] Lines: 72 Xref: news.epix.net rec.radio.amateur.equipment:23294 rec.radio.amateur.homebrew:12486 On 27 Dec 1995 22:48:51 GMT Michael G. Reiney (mreiney@hevanet.com) wrote in rec.radio.amateur.homebrew: : I have an Atlas 210X that works fine on 40 meters and up. On 75 meters, I can only : get about 40W out of it. : I hypothesize that if the high freq power out is ok, the transistors are good. : The 80M filters are not tunable, so they've probably not been tweeked. I obtained a 210X a couple of years ago, before a year-long trip to Nicaragua (where I operated as YN1ASW). I thought an older simpler rig might be more reliable and maintainable in a situation where I would have little test equipment and parts accessibility would be difficult. I checked the rig out at home with a regulated power supply, but when I got to Nicaragua I had a number of unexpected problems. First, my power source was a 12V battery charged by a solar panel, and I found the Atlas really needed the extra voltage available when the battery was under charge, the output power would fall off a lot when the voltage fell from 13.6 down to 12V. More seriously, I found that there were serious instability problems if the rig looked into a reactive load. It would work fine directly into a dummy load, but through a tuner into the load or into a real antenna, whether through the tuner or not, it would break into parasitic oscillations as the drive was brought up to a critical level. I don't know exactly what frequency the oscillations were, but they tended to wipe out my housemates' VHF TV reception, and this put major constraints on my operating schedule. I was able to get some control over the situation by putting a high resistive load (I think I used something like 1000 ohms, 2 watts -- I had a limited stock of resistors) across the input of the tuner. The idea was to have a high enough value that it would take a negligible amount of power at frequencies where the load looked like 50 ohms, but at other frequencies where presumably the antenna and/or the tuner looked like some kind of high-Q circuit this might damp it enough to suppress the parasitics. I was able to operate at reduced power levels this way, but any attempt to go for full power would result in parasitics again. My operation was mostly on 20 meters, sometimes on 15 when it would support my skeds back to the US. I never was able to get more than about 50 watts out of the rig. When I first obtained the rig I got a packet of info from Hi Manuals, which included a lot of info on various mods in early production versions of the Atlas, some of which I recall had to do with power output or stability problems. As far as I could tell my own Atlas was a late enough model to incorporate all the fixes, but it still gave me a lot of problems. My conclusion is that it just pushed too hard at the limits of the technology of its day, and that variations in the semiconductors probably weren't adequately protected against. I don't know if any of this is relevant to your problems, but maybe there are some connections. I would definitely look for parasitics that may be robbing power from the operating frequency. If anyone reading this has any comments on the problems I experienced I would appreciate hearing them. When I left Nicaragua in Dec. 94 I put the rig in storage there, as I expect to return there for another extended stint in the next year or two. But it would be nice if I could go back armed with some ideas about how to get the 210X to behave a bit better. 73, Al N1AW -- Al Woodhull awoodhull@hamp.hampshire.edu n1aw@k1mea.#wma.ma.usa.na n1aw@ka1jy.ampr.org From Unknown Fri Jan 05 12:35:34 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!pop.gnn.com!JOHNWHITE From: JOHNWHITE@gnn.com (William White) Newsgroups: rec.radio.amateur.homebrew Subject: 2M T/R relay plans? Date: Mon, 01 Jan 1996 18:10:21 Organization: Megaweb Lines: 7 Message-ID: <4c9phd$9g8@news-e1a.megaweb.com> NNTP-Posting-Host: @www-22-116.gnn.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" X-GNN-NewsServer-Posting-Date: 1 Jan 1996 23:08:29 GMT X-Mailer: GNNmessenger 1.2 I am looking for construction details for a 2 Meter T/R relay. Any help? Thanks, John KD4YRB From Unknown Fri Jan 05 12:35:35 1996 Path: news.epix.net!news.sprintlink.net!news.rmci.net!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!news.ksu.ksu.edu!news.cis.okstate.edu!master.ceat.okstate.edu!gcouger From: gcouger@master.ceat.okstate.edu (COUGER GORDON) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Transmitting 300baud data on 27/49Mhz Date: 1 Jan 1996 22:36:21 GMT Organization: CEAT at Oklahoma State University, Stillwater Lines: 43 Message-ID: <4c9nl5$8of@news.cis.okstate.edu> References: <4c49gn$6a3@newsbf02.news.aol.com> Reply-To: Gordon Couger NNTP-Posting-Host: master.ceat.okstate.edu In article <4c49gn$6a3@newsbf02.news.aol.com>, Warhurst wrote: >Julian Warhurst >warhurst@aol.com > >I am in the process of designing a low baud rate data link for a remote >instrumentation station. I had considered using the 49Mhz RC/Cordless >Telephone or the 27Mhz "Citizens Band" frequencies simply because of the >availability and low cost of the hardware. However the range of about 2 >miles proved inadequate for a 100mW 49Mhz transmitter, but a 3 watt 27Mhz >hand held transceiver worked perfectly. >Here are my questions: > >Are there any restrictions on transmitting data (300 baud FSK) on 27Mhz >above the 100mW power threshold? > A couple of years ago I looked into this fairly extensively. 27 MHz CB is a no - no as is commercial 50 150 and 450 MHZ bands. We ended up using the 4?? MHz GMARS citizens band and I am not sure that this is stirctly leagle. If you are building a personal deveice I would look in to using directional antennas you only need 5 db gain over the antenna you are using on 27 MHz a 3 element Yagi-Uda on each end might do. This is not leagle for part 15 of the FCC rules as it is no longer defined as 100 mw but defined volts per square meter and a derictional antenna will exced these levels. If it is for personal use a ham licence is easy to get and 220 & 440 are leagle at any power level. For a commercial device I don't know of a solution. For and expermential device of any kind the FCC issues expermanetal licences for one year at a time that are easy to renue. As I recall you need to fill out a form and include a letter explaining what you are doing. Good luck Gordon AB%DG Gordon Couger senior software specialist Biosystems & Agricultural Engineering. 114 AG Hall Stillwater, OK 74075 gcouger@master.ceat.okstate.edu 405 744 8392 day 625-2855 evenings From Unknown Fri Jan 05 12:35:37 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!ns1.iamerica.net!usenet From: Darrell Barabash Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Subject: Re: 90 ohm cable on 300 ohm antenna Date: Mon, 01 Jan 1996 23:25:57 -0600 Organization: iAmerica, Inc. Lines: 20 Message-ID: <30E8C1E5.7304@iamerica.net> References: <4beib0$892@concave.convex.com> NNTP-Posting-Host: iad_ppp0221.iamerica.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) To: Loren Coe Xref: news.epix.net rec.radio.amateur.homebrew:12491 rec.radio.amateur.antenna:18183 Loren Coe wrote: > > what determines the impedance of an antenna? is there anything i can do > to mitigate the need for a matching xfmr. > Virtually every physical aspect of an antenna affects its impedance. Generally , though, a yagi type antenna is designed with a dipole as the driven element. Y our antenna is 300 ohms because the driven element is (probably) a "folded dipole" . A folded dipole looks like a rather narrow an elongated rectangle. One property of a folded dipole is that the "folding" is usually designed to cause a 4:1 impedan ce increase. Thus, a dipole which is typically about 73 ohms is transformed to ab out 292 ohms (300 ohms effectively). Replacing the driven element with a conventional dipole is one way of avoiding the matching transformer. But, you should still use a 1:1 coaxial balun to convert from unbalanced to balanced. Darrell Grapevine, TX From Unknown Fri Jan 05 12:35:37 1996 Path: news.epix.net!news.sprintlink.net!news.interport.net!usenet From: Michael Neidich Newsgroups: rec.radio.amateur.homebrew Subject: FREE: Zenith Trans-O Model Nubmers vs. Features Date: 2 Jan 1996 03:51:51 GMT Organization: Interport Communications Corp. Lines: 3 Message-ID: <4caa4n$9t3@park.interport.net> NNTP-Posting-Host: neidich.port.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Request via email 73, K2ENN From Unknown Fri Jan 05 12:35:39 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: HF Amplifiers Date: Tue, 02 Jan 96 07:57:58 GMT Lines: 24 Message-ID: <820613191.12472@pinetree.microserve.com> References: <4cc0i0$16lj@news.cuny.edu> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 Edouard Elizee wrote: >I am trying to assemble my own HF medium power amplifier. You might want to contact R.F. Electronics. They sell amplifier kits with power ratings of 300, 600 and 1,200 watts. You can buy them as kits or assembled, or just buy certain parts. For example, they list the PC board with parts list and instructions for $25.00 (300W). The 600W amplifier uses two boards ($45.00); the 1,200W uses four ($85.00). They also sell the various size heat sinks, 5-pole Chebyshev filter kit ($40.00 - covers 160, 80, 40, 20, 15 & 10M), and other parts. I haven't done business with this company myself, but you can reach them at: R.F. Electronics Lee Martin KD4YBC 197 Chickasaw Lane Myrtle Beach, SC 29577 (803) 236-2640 (10:00AM-9:00PM EST) 73, Jack WB3U From Unknown Fri Jan 05 12:35:40 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!in-news.erinet.com!ragnarok.oar.net!malgudi.oar.net!watt.oedison.com!usenet From: wagnerj@watt.oedison.com (John Wagner) Newsgroups: rec.radio.amateur.homebrew Subject: Re: ECP/EPP bidirectional PC parallel ports Date: Tue, 02 Jan 1996 14:58:59 GMT Organization: Ohio Edison Company, Akron OH Lines: 26 Message-ID: <4cbgv1$l9i@watt.oedison.com> References: <4bck80$sbp@news.orst.edu> <4c71v4$r52@Twain.MO.NET> NNTP-Posting-Host: go-bus-appl-4-8x.oedison.com X-Newsreader: Forte Free Agent 1.0.82 >Johan Forrer (forrerj@ucs.orst.edu) wrote: >: Hi all, >: Does anyone perhaps know how to use/program the new ECP/EPP parallel >: ports that one see nowadays on PC parallel interface cards? >: I understand that they support the older nybble-based printer standard, >: but in addition also support a full bidirectional interface, which of >: course will make them that much more attractive for interfacing to >: ham-radio projects. >: Any information or pointers would be much appreciated. >: --Johan Forrer, KC7WW I just ran across the mother of all PC port interface pages: http://www.paranoia.com/~filipg/HTML/LINK/PORTS/F_Parallel.html There is info on Parallel, Serial, Joystick (analog), etc. ------------------------------------------------------------------- John Wagner wagnerj@watt.oedison.com For Encrypted Mail: PGP Public Key Available upon Request From Unknown Fri Jan 05 12:35:41 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!eerie.acsu.buffalo.edu!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news3.digex.net!bab00110.slip.digex.net!user From: cps@access.digex.net (Chris Smolinski) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics Subject: Mid-Atlantic Hamfests Date: Tue, 02 Jan 1996 18:22:34 -0500 Organization: Smolinski Scientific Systems, Inc. Lines: 22 Message-ID: NNTP-Posting-Host: bab00110.slip.digex.net X-Newsreader: Yet Another NewsWatcher 2.1.1 Xref: news.epix.net rec.radio.amateur.homebrew:12497 rec.radio.amateur.misc:96413 sci.electronics:164651 I used to keep a schedule online of upcoming hamfests in the Mid-Atlantic (roughly Northern Virginia to New York) area. I'd like to do the same thing this upcoming hamfest season. I would appreciate it if anyone who knows of an upcoming hamfest would email me with the details, and I'll add it to the list. Even though hamfest season is still some time away, it's never too early to start! Thanks, Chris N3JLY -- ---------------------------------------------------------------------------- |Check out my WWW page at http://www.access.digex.net/~cps/ for scientific | |software for the Mac, Free Radio, Shortwave Radio, and Spy Numbers Stations | |information. | |Finger me (cps@access.digex.net) for my PGP Public Key | ---------------------------------------------------------------------------- From Unknown Fri Jan 05 12:35:42 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!minfox!tom.alldread From: tom.alldread@minfox.com (Tom Alldread) Newsgroups: rec.radio.amateur.homebrew Subject: CMOS SUPERKEYER II CURRENTS Date: Tue, 2 Jan 1996 19:17:00 GMT Message-ID: <9601031820348672@minfox.com> Organization: MINFOX Courtenay, BC (604)-337-2023 Distribution: world Lines: 51 Greetings: Further to earlier post on this subject I have recorded the current drawn by my CMOS SUPERKEYER II in various modes. I connected a digital mA meter in series with my keyer battery to measure the current drain and the following is the test results (with the sidetone monitor speaker turned off): KEYER MODE SENDING DASHES: 3.35 milli Amperes KEYER MODE SENDING DITS: 3.22 milli Amperes KEYER MODE IDLE-FIRST 3 SECS: 2.64 milli Amperes KEYER MODE IDLE-AFTER 5 SECS: 0.9 micro Amperes (IE: 0.0009 milli Amperes) HAND KEY MODE - KEY DOWN 3.45 milli Amperes HAND KEY MODE - KEY UP 2.53 milli Amperes continuous FUNCTION MODE 2.61 milli Amperes continuous TRANSMIT TUNE 3.19 milli Amperes continuous ? INTERROGATE MODE 2.72 milli Amperes continuous With the monitor speaker on in the ~hand key~ mode and key down the current increased to 18.45 milli Amperes. As shown the only time my keyer will go into its power down sequence is when it is in the regular ~keyer~ mode. Generally the CMOS SUPERKEYER II has served me very well and I am pleased with it. Now that I am aware of its power down characteristics I will be careful to ensure that I leave it in the ~keyer mode~ when not in use to preserve the battery life. In the event that a new version of firmware is written possibly a suitable watch dog timer could be incorporated to kick the keyer out of the special modes after an appropriate delay. To help preserve battery longevity for those that regularly use the keyer in the ~hand key~ mode possibly a second power down sleep sequence could also be provided for that mode of operation. It would be interesting to hear from others that make similar power drain measurements on their CMOS SUPERKEYER II keyers to determine if the characteristics were improved in later versions. Mine is probably has the first firmware release as I built it shortly after the article was published in November 1990 QST. 73 de VE7TMA --- * QMPro 1.53 * Very Best Regards, tom.alldread@minfox.com From Unknown Fri Jan 05 12:35:43 1996 Path: news.epix.net!news.sprintlink.net!service-2.agate.net!usenet From: John Wilcox/NS1Z Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: 2 Jan 1996 23:56:36 GMT Organization: Agate Internet Services (AIS) Lines: 15 Message-ID: <4ccgnl$kav@service-2.agate.net> References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> NNTP-Posting-Host: ns1z.sdi.agate.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) I built the kit and was quite impressed with it. Works as advertised and only glitch was inserted by myself. It is now installed in the Jimmy under the IC-706 and working against a mobile 4 band Hustler style antenna on the rear bumper. What's the big deal, haven't seen anyone complain about Yaesu, Kenwood or Icom not giving their stuff away..... -- John Wilcox / NS1Z 44.118.6.4 ns1z@ns1z.ampr.org 204.117.6.48 ns1z@rumford.agate.net ns1z @ kb1bsc.fn44rn.me.usa.noam From Unknown Fri Jan 05 12:35:44 1996 Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!van-bc!unixg.ubc.ca!nntp.cs.ubc.ca!newsxfer.itd.umich.edu!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!gulseth From: gulseth@spk.hp.com (Marty Gulseth) Newsgroups: rec.radio.amateur.homebrew Subject: ATV CAMERA CONNECTIONS Date: 3 Jan 1996 00:16:13 GMT Organization: Hewlett Packard Corvallis Site Lines: 18 Message-ID: <4cchsd$79s@hpcvsnz.cv.hp.com> NNTP-Posting-Host: hpspkeb.spk.hp.com X-Newsreader: TIN [version 1.2 PL2.2] Hello All, If I have posted this to the wrong newsgroup, please don't flame me - I am new at this! I have an older video camera left over from the family entertainment center which another local ham wants to use for ATV work. The camera is (for reference) a Minolta K-520S, and is the kind with the cord which connects to a separate VHS tape deck. The connector is ten pins. I understand that the above connector arrangement was "semi-standard" for this sort of camera. Does anyone have information on the pinout for this camera, or know where I could find same? Please reply to me at gulseth@spk.hp.com. Thanks to all! 73 DE W7LEJ - Marty Gulseth, Spokane, WA From Unknown Fri Jan 05 12:35:45 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!nntp-hub2.barrnet.net!news.Stanford.EDU!w6yx.stanford.edu!stevem From: stevem@w6yx.stanford.edu (Steve Muther) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need AA-size dummy cell/bridge Date: 3 Jan 1996 00:34:47 GMT Organization: Stanford Amateur Radio Club Lines: 18 Message-ID: <4cciv7$sd3@nntp.Stanford.EDU> References: NNTP-Posting-Host: w6yx.stanford.edu In article dgf@netcom.com (David Feldman) writes: >I'm looking for a source of dummy cells, AA size. These would be used when >(for example) you want to use 6 alkaline (1.5V) cells in lieu of 7 nicad >(1.2V) cells and need to bypass one of the cells in a way that's mechanically >sound. Has anyone seen these for sale anywhere? > >73 Dave WB0GAZ dgf@netcom.com I just cut the head off an old steel bolt or cut a length of brass rod stock whenever I wanted to do this. Some heat shrink around the rod keeps things insulated if needed. Steve Muther WF6R stevem@w6yx.stanford.edu From Unknown Fri Jan 05 12:35:46 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news.isp.net!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!prodigy.com!usenet From: TSJV87A@prodigy.com (Ernest Hansen) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Sending digital data on 27/49Mhz Date: 3 Jan 1996 02:36:53 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 10 Distribution: world Message-ID: <4ccq45$2d26@usenetp1.news.prodigy.com> References: <4c4kkd$9s4@newsbf02.news.aol.com> NNTP-Posting-Host: inugap4.news.prodigy.com X-Newsreader: Version 1.2 If this device is being used in the Amateur Radio Service there is frequencies in the 6 meter band reserved for radio control aircraft (if that is what you are doing). Also check frequency listings for garage door opener and etc freqencies (up about 300mhz) - ERNIE TSJV87A@prodigy.com (K3VVV) From Unknown Fri Jan 05 12:35:47 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news-feed.mci.newscorp.com!usenet From: jtriolo@mci.newscorp.com (Jason D. Triolo) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,sci.electronics Subject: Re: Mid-Atlantic Hamfests Date: Wed, 03 Jan 1996 05:21:41 GMT Organization: News Corp./MCI Online Ventures Lines: 39 Message-ID: <4cd3q4$j5i@merlin.delphi.com> References: NNTP-Posting-Host: slip163-188.bb.delphi.com X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.amateur.homebrew:12505 rec.radio.amateur.misc:96430 sci.electronics:164707 cps@access.digex.net (Chris Smolinski) wrote: >I used to keep a schedule online of upcoming hamfests in the Mid-Atlantic >(roughly Northern Virginia to New York) area. I'd like to do the same >thing this upcoming hamfest season. >I would appreciate it if anyone who knows of an upcoming hamfest would >email me with the details, and I'll add it to the list. >Even though hamfest season is still some time away, it's never too early >to start! Well...about 90 miles south of Metro DC is the annual Frostfest in Richmond. Held at the Showplace...3000 Mechanicsville Tpk, Richmond, VA Sunday, 1/21/96 from 8:30 to 3:30. Take I-95 south to I-64 East (Exit 75) to US 360 East (Exit 192). Showplace is 1/2 mile on the left. Parking is free, admission is $5.00. No discounts for advance tickets. Licensing exams are usually conducted the day before. Not sure what is planned for this year. Info is available through the voice mail service of the Richmond Amateur Telecommunications Society at 804/739-2269. Enter box number 3378 (FEST) for general information and table reservations. Major retailers are expected there (most notably HRO, but there are many others), a number of manufacturers (not sure who has committed yet), and ample flea market space. Computer vendors will also be there. Hope to see you there! E-Mail me if you need more info. 73 de Jason, KD4ACG jtriolo@mci.newscorp.com From Unknown Fri Jan 05 12:35:48 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!miwok!well!pacbell.com!ihnp4.ucsd.edu!swrinde!newsfeed.internetmci.com!in1.uu.net!news.iij.ad.jp!super.win.or.jp!usenet From: oguma@super.win.or.jp (Akihiro Oguma) Newsgroups: rec.radio.amateur.homebrew Subject: Looking for crystal controlled transmitter Date: 3 Jan 1996 05:26:03 GMT Organization: Your Organization Lines: 21 Message-ID: <4cd41b$mg@super.win.or.jp> NNTP-Posting-Host: ppp3347.win.or.jp Mime-Version: 1.0 X-Newsreader: WinVN 0.99.3J I would really like to find transmitter. If possible,it is crytal controlled one and batteryis supplied with AC. Because... There are a few types,so we can easily find it bug. Could you tell me the fax number or E-mail address of the shop ? Thanks much! Akihiro Oguma oguma@super.win.or.jp  From Unknown Fri Jan 05 12:35:49 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!elendir From: elendir@enst.fr (Elendir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: HF Amplifiers Date: 3 Jan 1996 11:35:37 GMT Organization: ENST - Telecom Paris Lines: 11 Message-ID: <4cdpm9$p61@tempo.univ-lyon1.fr> References: <4cc0i0$16lj@news.cuny.edu> <820613191.12472@pinetree.microserve.com> NNTP-Posting-Host: julia.enst.fr X-Newsreader: TIN [version 1.2 PL2] WB3U (jackl@pinetree.microserve.com) wrote: : Edouard Elizee wrote: : >I am trying to assemble my own HF medium power amplifier. : You might want to contact R.F. Electronics. They sell amplifier kits : with power ratings of 300, 600 and 1,200 watts. You can buy them as HI. You call a 300 W amplifier "medium power" ? It is already more than we are authorized here ! (in France : 250 W max.) Just frightened :-) Vince, F5RCS From Unknown Fri Jan 05 12:35:50 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet From: Jim Strohm Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need AA-size dummy cell/bridge Date: 3 Jan 1996 15:30:40 GMT Organization: Semiconductor Products Sector Lines: 4 Message-ID: <4ce7f0$gu2@newsgate.sps.mot.com> References: NNTP-Posting-Host: 222.229.249.169 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; PPC) X-URL: news:dgfDKKss7.L9K@netcom.com Wrap a dead AA cell in tinfoil, and insulate with masking tape if necessary. Can't get much cheaper and simpler thna that. From Unknown Fri Jan 05 12:35:51 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!ns3.iamerica.net!ias_ppp0103.iamerica.net!user From: jttravis@iamerica.net (J. Travis) Newsgroups: rec.radio.amateur.homebrew Subject: Need headphone switching circuit Date: Wed, 03 Jan 1996 15:33:25 -0600 Organization: Anesthesia Associates Lines: 14 Message-ID: NNTP-Posting-Host: ias_ppp0103.iamerica.net Hi, I need help designing a simple circuit. I have two audio outs (A and B). A is stereo and primary, B is infrequently used. I'd like a circuit that would allow me to plug in one set of earphones and monitor A, but when B comes on to switch to it then back when B is silent - it could be to just one channel of the headphones to simplify. I'd like it to be self powered. Thanks in advance. KC5DWU -- J.T.Travis | jttravis@iamerica.net '93 EX-500 From Unknown Fri Jan 05 12:35:52 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!news.agt.net!news From: smason@agt.net (Steve Mason) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Wed, 03 Jan 1996 17:21:47 GMT Organization: AGT Ltd. Lines: 13 Message-ID: <30eab764.4581982@news.agt.net> References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4ccgnl$kav@service-2.agate.net> NNTP-Posting-Host: clgrpt02-port-15.agt.net X-Newsreader: Forte Agent .99c/16.141 On 2 Jan 1996 23:56:36 GMT, John Wilcox/NS1Z wrote: :>I built the kit and was quite impressed with it. Works as advertised and :>only glitch was inserted by myself. It is now installed in the Jimmy :>under the IC-706 and working against a mobile 4 band Hustler style >antenna on the rear bumper. What's the big deal, haven't seen anyone >complain about Yaesu, Kenwood or Icom not giving their stuff away..... I missed the start of this thread, which QST was this in? Thanks, Steve VE6STV From Unknown Fri Jan 05 12:35:53 1996 Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!HiWAAY.net!imci2!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: lelanda@atcon.COM (Leland Anderson) Newsgroups: rec.radio.amateur.homebrew Subject: (none) Date: 3 Jan 96 17:25:55 GMT Organization: ucsd usenet gateway Lines: 3 Message-ID: <199601031725.NAA26149@loki.atcon.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu unsub lelanda@atcon.com Lee Anderson. From Unknown Fri Jan 05 12:35:54 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!news-relay.us.dell.com!pmafire!net.ricks.edu!usenet From: griffithj@ricks.edu (James Griffith) Subject: Re: QST Automatic Tuner Article Message-ID: Sender: usenet@ricks.edu (usenet) Organization: Ricks College X-Newsreader: WinVN 0.93.11 References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> Mime-Version: 1.0 Date: Wed, 3 Jan 1996 18:29:55 GMT Lines: 88 In article <4c6es2$394@mgate.arrl.org>, ehare@arrl.org says... > >griffithj@ricks.edu (James Griffith) wrote: > >>>QST is sold at most major news stands and magazine racks now. You might >>want to try that. The artical is not that big a deal. It's an >>advertisment so its writer can make money. It would be difficult to >>duplicate without buying their kit. QST is going same way Popular >>Electroncs went years ago, selling kits with articles. > >Hello, Jim, > >I don't kwow if I would go *that* far. First, ARRL doesn't sell the >kits; the authors do. From the feedback we have received from readers, >most readers *prefer* construction articles that have kits. And, in most >cases, even if a construction project has a kit, the builder can still >dead-bug it, if he or she chooses. This tuner article is almost an >exception to the rule, in that it requires a part that is available only >from the author. However, the author will gladly sell the >progrmammed IC only for those who want to locate all the other >parts themselves. (I wonder if *anyone* will take him up on the >offer; I want the kit! :-) ). > > >> > >I don't mean to sound like a "wet blanket", and I don't know your age, mine is 52. But, I remember the exciting time when, with almost nothing at all, one could get on the air with something he or she built. Or, if you were intrested in just building an electronic project from Ppopular Electronics, you were able, because at the age of 12 or 13 you didn't have the money to by that one part that could only be bought from that special place, who ever or were ever it might be. Have you ever longed to build something electronic at the age of 12 or so, and had no money, but the author gave you a way to do in in the article, like the code for the chip, or the turns count and size of the coil. I believe,(This is only me talking.) and I am a member of ARRL and you have published 2 very popular articles I wrote, at least my fan mail said so, that QST is no longer a member publication devoted to ham radio, FOR THE LOVE OF IT, but has gone into business, targeting those people who would buy more magazines, (Your on the news stand now.) books, and other offers the ARRL has, and has geared it QST publication toward them. Who are those people, (Me talking again.) thay are people who never grew up in ham radio scrounging a part or a who rig full of parts to get on the air, and if the truth be known, computer have the interest of the young people, not ham radio. I can talk any were in the world on internet who needs a radio. Those are the people targeted by QST. We all see the QRP articales, about the only rig that can be built any more, if one can find a variable capacitor. Have you even seen a dealer advertise a line of variable capacitors in QST or any were elce. I have been in hard electronic repair for 35 years, and I can fix hundreds of things not made anymore, or will never be made again. Why, becasue it all gone to software, and QST won't publish it so we can use are new skills and try and program our EPROM or processor chip, we have to buy it, just like Popular Electronics. When is the last time we saw a 75 watt Novice rig in QST built and presented by the ARRL lab. Packet is the revolution for those with interest in computers. I can use computers, and repair them, thank you. I tried packet and sold it. My time is better spent on something that is real time then waiting on the postman. I, and people like me, are no longer the interest of the ARRL, or QST. I love ham radio. It has gotten me good jobs from the skills it has given me. I have talked to lots of people. Years ago thay all built something, today most do not even own a good soldering iron. QST know that. I, and the 12 and 13 year olds are no longer the target, the kit builder, and the buyer of new equipment is because there in no money in me and a 12 year old. There never has been any money in me and my kind in ham radio because we build from parts, which there is no money in. We are the ones that some QST articles have made fun of because we see a good deal in a broken radio, and can fix it, or see the value in a pile of junk that know one elce can recognize, and are no longer recongnized by QST. That is why the missing chip code to the ATU article is importent. Not because you can build the unit by odering the part, but because you can not say, on the air, I programed the chip myself from and article in QST. From Unknown Fri Jan 05 12:35:55 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!in2.uu.net!skypoint.com!usenet From: "Neil A. Gjere" Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,sci.engr.television.broadcast Subject: HELP!! Ham Needs WR-42 Waveguide Components Date: 3 Jan 1996 20:30:51 GMT Organization: GjereRig Inc. Lines: 18 Message-ID: <4cep1r$jog@stratus.skypoint.net> NNTP-Posting-Host: dial013.skypoint.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Xref: news.epix.net rec.radio.amateur.misc:96451 rec.radio.amateur.equipment:23373 rec.radio.amateur.homebrew:12512 sci.engr.television.broadcast:1146 I am in desperate need of a 50 or 60 db WR-42 fixed Waveguide attenuator as well as a 0 to 40 or 50 db WR-42 variable Waveguide attenuator. These are being used to set up some 18 Ghz Microwave Radios. My usual source for these type of components has gotten out of the as they put it, "Plumbing Business" I only need them for a short period of time, I will pay for shipping in both directions and will reward you both financially and with unending gratitude!!! Please respond via: ngjere@ktca.org 73s Neil A. Gjere N0PFZ From Unknown Fri Jan 05 12:35:56 1996 Path: news.epix.net!news.sprintlink.net!service-2.agate.net!usenet From: John Wilcox/NS1Z Newsgroups: rec.radio.amateur.homebrew Subject: Reselling the home brew equipment Date: 4 Jan 1996 00:05:20 GMT Organization: Agate Internet Services (AIS) Lines: 19 Message-ID: <4cf5k1$4dd@service-2.agate.net> NNTP-Posting-Host: ns1z.sdi.agate.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Was talking with my buddy this evening on the subject of buying and selling home brew gear. It was my opinion that home brew gear took such a beating at the sales table/tailgate due to the fact that most hams believe that no other ham has any construction skills and therefore, any equipment built by Mr. No Skill is worthless, except for the parts (which may or may not be any good!). Is this the way it is in your area of the world? What would make a piece of HB gear more valuable to the astute buyer? -- John Wilcox / NS1Z 44.118.6.4 ns1z@ns1z.ampr.org 204.117.6.48 ns1z@rumford.agate.net ns1z @ kb1bsc.fn44rn.me.usa.noam From Unknown Fri Jan 05 12:35:57 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!multiverse!en.com!wariat.org!usenet.ins.cwru.edu!agate!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news.kei.com!uhog.mit.edu!news.mtholyoke.edu!news.umass.edu!rcfnews.cs.umass.edu!usenet From: heckers@db.erau.edu (Shawn Hecker) Newsgroups: rec.radio.amateur.homebrew Subject: 14.230 MHz receiver? Date: Thu, 04 Jan 1996 00:29:51 GMT Organization: CS Dept., Umass-Amherst Lines: 16 Message-ID: <4ces60$53n@kernighan.cs.umass.edu> NNTP-Posting-Host: erau.db.erau.edu X-Newsreader: Forte Free Agent 1.0.82 I was wondering if anyone could help me out here. A couple weeks ago I was given a scanner (Bearcat 210). The scanner doesn't pick up 14.230 MHz (the main frequency for SSTV transmissions). Could anyone give me a simple schematic that would receive this frequency, or a mod for my scanner? I read an earlier message about altering a Radio Shack weather radio to receive 144 MHz, would this same mod work for 14.230 MHz? If so, how is it done? Thanks in advance. Shawn (heckers@db.erau.edu) P.S. Please respond via e-mail if possible (or at least send a CC to my e-mail address). From Unknown Fri Jan 05 12:35:58 1996 Path: news.epix.net!news.sprintlink.net!news1.cris.com!news From: tcmedlin@cris.com Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: SIMPLE SIMPLEX REPEATER....HELP Date: 4 Jan 1996 00:33:55 GMT Organization: Concentric Internet Services Lines: 23 Message-ID: <4cf79j$559@spectator.cris.com> NNTP-Posting-Host: cnc086035.concentric.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2 (Windows; U; 16bit) Xref: news.epix.net rec.radio.amateur.misc:96463 rec.radio.amateur.equipment:23384 rec.radio.amateur.homebrew:12522 I recently built the simple simplex repeater as described in 73 Amateur Radio Today, nov 1995 issue but i have one problem that i need help resolving. if the receiver receives a signal for about one half second or less, the simplex repeater keys up for the entire 20 second period then drops out. any received signal more than about a half second operates it correctly. example: if the receiver receives a signal for 5 seconds, after the rec signal drops, it then retransmits this signal for 5 seconds and then resets or drops out. it is only the very quick keying pulses that lock this thing up. the repeater is based on the ISD1000A voice record/playback IC which can be found at radio shack and about 30 simple parts. this chip is designed to record a maximun of 20 seconds. there are 2 rc delay circuits which i have tried to adjust but this does not seem to help. I dont think the problem is power related as i have a good supply, and plenty of filtering and bypassing on it. If anyone can help, please email me at tcmedlin@cris.com thanks, Tom WA5KUB email: tcmedlin@cris.com From Unknown Fri Jan 05 12:36:00 1996 Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!chi-news.cic.net!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!in1.uu.net!prodigy.com!usenet From: TSJV87A@prodigy.com (Ernest Hansen) Newsgroups: rec.radio.amateur.homebrew Subject: Converting Cellular to 902MHZ band Date: 4 Jan 1996 00:39:44 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 19 Distribution: world Message-ID: <4cf7kg$l7s@usenetp1.news.prodigy.com> NNTP-Posting-Host: inugap4.news.prodigy.com X-Newsreader: Version 1.2 rec.radio.amateur.homebrew [1] Converting Cellular to 902MHZ band TSJV87A@prodigy.com Does anyone have any advice, recomendations, information or pointers to information on converting cellular telephone equipment to the 902 MHZ amateur band? Is it possible? Post or Email me at TSJV87A@prodigy.com. Thank You Very Much. - ERNIE TSJV87A@prodigy.com From Unknown Fri Jan 05 12:36:01 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!news.cc.swarthmore.edu!psuvax1!news.math.psu.edu!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!dgf From: dgf@netcom.com (David Feldman) Subject: Re: Reselling the home brew equipment Message-ID: Organization: Organization? Me? References: <4cf5k1$4dd@service-2.agate.net> Date: Thu, 4 Jan 1996 00:44:10 GMT Lines: 36 Sender: dgf@netcom17.netcom.com In article <4cf5k1$4dd@service-2.agate.net> John Wilcox/NS1Z writes: >Was talking with my buddy this evening on the subject of buying and >selling home brew gear. It was my opinion that home brew gear took such a ... >world? What would make a piece of HB gear more valuable to the astute >buyer? I have bought several homebrew amplifiers. Usually projects derived from publications (my interest is in VHF/UHF high power amps). In this case there is little alternative to homebrew. Power amps are simple enough you can visually tell the condition (except for tubes), and it's not too hard to figure out the value of parts and labor and get documentation (in the form of original publications). A project faithfully built to published docs (such as a K2RIW amplifier) I think is worth a good price. Homebrew solid state gear has for me generally been a disappointment and I tend to avoid it unless it's a specialty for me (tiny QRP, etc., again with some related documentation). I _always_ avoid "homebrew" computers and related parts - too hard to know if it's working without GOOD recourse. 73 Dave WB0GAZ dgf@netcom.com > >-- >John Wilcox / NS1Z >44.118.6.4 >ns1z@ns1z.ampr.org >204.117.6.48 >ns1z@rumford.agate.net > >ns1z @ kb1bsc.fn44rn.me.usa.noam > > From Unknown Fri Jan 05 12:36:02 1996 Path: news.epix.net!news.sprintlink.net!news.inc.net!novia!news.dpc.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!van-bc!news.mindlink.net!agate!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Re: Reselling the home brew equipment Date: 4 Jan 1996 02:53:53 GMT Organization: Los Alamos National Laboratory Lines: 27 Message-ID: <4cffg1$bt6@newshost.lanl.gov> References: <4cf5k1$4dd@service-2.agate.net> NNTP-Posting-Host: jdport.lanl.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) To: ns1z@rumford.agate.net HB gear is next to worthless resale-wise because it IS homebrew. There is no factory to contact regarding parts, design, schematics, or service information. I'm not trying to belittle homebrew gear, I'm a very avid homebrewer myself but facts are facts. Buying a hb circuit for the parts is a bad deal too since it is so labor intensive to try to salvage out parts. About the only exception to this might be well made RF amplifiers which use common designs as well as universally available parts (usually). Thus, my advice would be for you to hang on to your homebrew projects and show them to your grandkids or something or just drag them out and sigh over them in later years. Don't even salvage them for new projects. You will doubtless someday wish you still had those projects around. I sure wish I had followed this advice for so many of my projects of years ago that were then (and would be still) useless to most would-be buyers but priceless to the original builder or his family. -- |-------------------------------------------------------| |Jim Devenport WB5AOX | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |-------------------------------------------------------| From Unknown Fri Jan 05 12:36:03 1996 Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design Path: news.epix.net!news.sprintlink.net!newshub.cts.com!usc!chi-news.cic.net!nntp.coast.net!zombie.ncsc.mil!news.mathworks.com!news.kei.com!newsfeed.internetmci.com!in1.uu.net!news.ak.net!not-for-mail From: opworld@worldnet.fr (Hello) Subject: PCB for RF and linear ? Message-ID: <137cc$16cf.282@news.ak.net> Date: Thu, 04 Jan 1996 03:09:40 GMT Lines: 21 Xref: news.epix.net rec.radio.amateur.homebrew:12518 sci.electronics.design:1007 Hello, I bought a few years ago LAYO. I followed (and paid a lot) every upgrade. Today I think I made a wrong choice. The evolution of this product is poor. It's very borring to use because you have to translate between two products (one product for drawing and another for design PCB). For linear circuits with ground plane... I stop here, it's become incredible ! 1) I have linear and RF circuit to design : Is there a freeware, I can download to quickly do my work ? 2) Is there an interesting product ? (with a concurrential offer ?) Thanks for help Email opworld@worldnet.fr Happy New opworld@worldnet.fr Year From Unknown Fri Jan 05 12:36:03 1996 Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newshub.cts.com!usc!elroy.jpl.nasa.gov!swrinde!newsfeed.internetmci.com!in1.uu.net!news.ak.net!not-for-mail From: opworld@worldnet.fr (Hello) Subject: MC1496/1596 obsolete ? Message-ID: <137cc$16c20.255@news.ak.net> Date: Thu, 04 Jan 1996 03:09:57 GMT Lines: 10 Xref: news.epix.net sci.electronics.components:984 rec.radio.amateur.homebrew:12520 Hello, Is there a remplacement for this chips ? Happy New Year. opworld@worldnet.fr Happy New opworld@worldnet.fr Year From Unknown Fri Jan 05 12:36:04 1996 Newsgroups: sci.electronics,rec.radio.amateur.homebrew,sci.electronics.components Path: news.epix.net!news.sprintlink.net!newshub.cts.com!usc!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.ak.net!not-for-mail From: opworld@worldnet.fr (Hello) Subject: Need POS150 VCO spec's or quality VCO Message-ID: <137cc$16c35.2f5@news.ak.net> Date: Thu, 04 Jan 1996 03:10:20 GMT Lines: 11 Xref: news.epix.net sci.electronics:164790 rec.radio.amateur.homebrew:12521 sci.electronics.components:985 Hi, Looking for POS150 spec's. It's a VCO. All informations about VCO for 80-110 frequencies with very low distortion and low harmonics are welcome. Happy New opworld@worldnet.fr Year From Unknown Fri Jan 05 12:36:05 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!bcm.tmc.edu!news.msfc.nasa.gov!elroy.jpl.nasa.gov!usc!chi-news.cic.net!news.uiowa.edu!uunet!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet From: Jim Devenport Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: SIMPLE SIMPLEX REPEATER....HELP Date: 4 Jan 1996 03:17:09 GMT Organization: Los Alamos National Laboratory Lines: 28 Message-ID: <4cfgrl$bt6@newshost.lanl.gov> References: <4cf79j$559@spectator.cris.com> NNTP-Posting-Host: jdport.lanl.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) To: tcmedlin@cris.com Xref: news.epix.net rec.radio.amateur.misc:96500 rec.radio.amateur.equipment:23413 rec.radio.amateur.homebrew:12544 I couldn't believe I had this issue of 73 right in a small pile at my fingertips. Your description of the problem plus a perusal of the schematic makes me suspect some "squirrelies". I note the COS input line is bypassed with C3, a .22 uf capacitor. Is this in place and is it close to U4? If it is, I recommend the following: -Try installing .1 or .2 uf capacitors physically close to pins 4&5 of U3, pins 9 and 10 of U3, and pin 27 of U1. -I don't see it in the circuit but all your IC's, especially the logics (U3 and U4) should have the VCC pins bypassed with a 1 to 1 uf or so electrolytic mounted as close to the IC's as possible and with as short a connection to circuit ground or the IC ground as possible. I'd suggest this as your first priority. -You may also be experiencing RFI from your attached transceiver. It probably should be mounted in a good rf-proof box with incoming and outgoing wiring bypassed and/or choked with ferrite shells and other RFI reducing techniques. Good luck with the project. Hope some of this helps! -- |-------------------------------------------------------| |Jim Devenport WB5AOX | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |-------------------------------------------------------| From Unknown Fri Jan 05 12:36:07 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!hookup!noc.tor.hookup.net!news From: cstimson@hookup.net (Craig Stimson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need AA-size dummy cell/bridge Date: Thu, 04 Jan 1996 04:12:33 GMT Organization: HookUp Communication Corporation, Oakville, Ontario, CANADA Lines: 18 Message-ID: <4cfk6r$h43@noc.tor.hookup.net> References: NNTP-Posting-Host: cstimson.tor.hookup.net X-Newsreader: Forte Free Agent 1.0.82 Hi David, Radio Shack may carry these as a replacement part to their TRC series 11M GRS HT's. I Have an old TRC-201 that supplied two of these "dummy" batteries to use when you filled up the battery case with regular 1.5V AA cells instead of Ni-Cads. They probably wouldn't have them in the store but you could get them special ordered. Hope this helps. 73 Craig ++++++++++++++++++++++++++++++++++++++++++ + Craig Stimson + + E-mail: cstimson@hookup.net + + AX.25 : VA3DCS@VE3ZRD.#SCON.ON.CA.NA + ++++++++++++++++++++++++++++++++++++++++++ From Unknown Fri Jan 05 12:36:07 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: 4 Jan 1996 08:39:55 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 18 Sender: root@newsbf02.news.aol.com Message-ID: <4cglbb$m5l@newsbf02.news.aol.com> References: <30eab764.4581982@news.agt.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader >I built the kit and was quite impressed with it. Works as advertised and >only glitch was inserted by myself. It is now installed in the Jimmy >under the IC-706 and working against a mobile 4 band Hustler style >antenna on the rear bumper. What's the big deal, haven't seen anyone >complain about Yaesu, Kenwood or Icom not giving their stuff away..... > Hi, I'm curious how the software works. Does it just change something at random and see what happens, and if SWR gets better keep going in that direction? If you make a large load or band change how long does it take to tune? 73 Tom From Unknown Fri Jan 05 12:36:08 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!overload.lbl.gov!agate!howland.reston.ans.net!swrinde!cssun.mathcs.emory.edu!atglab.bls.com!usenet From: Gary@Techstds.al.bst.bls.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Thu, 04 Jan 96 10:01:51 PDT Organization: BellSouth ATG lab Lines: 30 Message-ID: References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> NNTP-Posting-Host: bstfirewall.atglab.bls.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage > > That is why the missing chip code to the ATU article is importent. Not > because you can build the unit by odering the part, but because you can > not say, on the air, I programed the chip myself from and article in QST. > > > Excellent comments. I, too, am one of those people who grew up scrounging parts from old TV's and radios. I enjoy thinking about, planning, obtaining parts for, and building things much more than operating them. I have been contemplating, for a few years, a home-brew ATU. Coincidentally, I planned to use the Motorola 68HC11 micro-controller chip, just like the one in QST, because I have the development board for it. The stimulating exercize, in my opinion, is developing the algorithm to iterate to the match (with the L network, there's only one). I had thought that both the phase and magnitude of the impedance (seen by the ATU) would be needed to drive the iteration routine for both the capacitance and inductance. Not having the 6811 source code, I don't know how the ATU in the article works, but it looks like only the SWR is used. One can only guess that a 'brute-force' search is used until an acceptable value of SWR is found. So, when I saw the article, the first thing I looked for was the source code. When I saw that it wasn't available, I was no longer interested. KO4CY From Unknown Fri Jan 05 12:36:10 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.west.net!usenet From: mark@reson.com (qrk) Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MC1496/1596 obsolete ? Date: Thu, 04 Jan 1996 10:41:06 GMT Organization: Marginal Lines: 10 Message-ID: <4cgb3t$cqg@daffy.sb.west.net> References: <137cc$16c20.255@news.ak.net> NNTP-Posting-Host: term1-15.sb.west.net X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net sci.electronics.components:990 rec.radio.amateur.homebrew:12523 opworld@worldnet.fr (Hello) wrote: >Is there a remplacement for this chips ? You might try the LM1496 from National Semiconductor. According to a new parts catalog, it is still available from National Semiconductor. - Mark Chun | mark@reson.com | Santa Barbara, CA From Unknown Fri Jan 05 12:36:11 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!dog.ee.lbl.gov!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: MUENZLERK@uthscsa.EDU (Muenzler, Kevin) Newsgroups: rec.radio.amateur.homebrew Subject: Converting Cellular to 902MHZ band Date: 4 Jan 96 13:28:00 GMT Organization: ucsd usenet gateway Lines: 30 Message-ID: <01HZLTSHAXQQ004YS6@uthscsa.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu on 4 Jan 1996 00:39:44 GMT TSJV87A@prodigy.com (Ernest Hansen) writes: -Does anyone have any advice, recomendations, information or pointers to -information on converting cellular telephone equipment to the 902 MHZ -amateur band? Is it possible? Post or Email me at TSJV87A@prodigy.com. -Thank You Very Much. - - ERNIE TSJV87A@prodigy.com Difficult and expensive. It would be cheaper to just buy the 900MHz rig. You have the problems with the very sharp filtering in the transmit and receive portions of the phone. Remember, the transmit and receive at the same time just like a repeater. They have VERY sharp bandpass filters to prevent the transmitter from desensing the receiver. You would have to change both of these filters. You would then have to change out the transmit module that is specifically designed to transmit in the 830MHz band. Most of these modules use direct digital synthesis that is controlled by CPU by specific "memory addresses." ie. 10100111 might mean "transmit on 832.875MHz" so the transmit module transmits on only a specific set of frequencies. The same is true for the receive module. Now if you can find one of the old (10+years) phones you might be able to modify one of those. They had a separate digital synthesizer and signal generator. Many of them used Z80 CPUs. Good luck Kevin, WB5RUE muenzlerk@uthscsa.edu From Unknown Fri Jan 05 12:36:12 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!eff!news.duke.edu!agate!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: MUENZLERK@uthscsa.EDU (Muenzler, Kevin) Newsgroups: rec.radio.amateur.homebrew Subject: Linear Transverters Date: 4 Jan 96 14:12:00 GMT Organization: ucsd usenet gateway Lines: 10 Message-ID: <01HZLVDOBBNM005MMF@uthscsa.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I am planning to buy a transverter (2 meter) that requires 1mw to 10mw input. My rig can be turned down to about 5 watts output. Should I just build a 20db attenuator or is there a better way? thanks Kevin, WB5RUE muenzlerk@uthscsa.edu From Unknown Fri Jan 05 12:36:12 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!oleane!tank.news.pipex.net!pipex!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!in1.uu.net!winternet.com!guitar.sound.net!news From: artus@sound.net (artus) Newsgroups: rec.radio.amateur.homebrew Subject: "Shooter" EPROMMER Date: Thu, 04 Jan 1996 15:48:07 GMT Organization: Sound Advice Limited's Internet Access for KC Lines: 5 Message-ID: <4cglm3$qho@guitar.sound.net> NNTP-Posting-Host: max1-27.sound.net X-Newsreader: Forte Free Agent 1.0.82 I have a Prompro PP4 (SN 5278) Shooter programmer, but no configurator chips. Does anyone know how these chips work? I assume they may just be shorting jumpers for the various PROMs. I've dropped a couple EMails to Logical Devices but no response. Thanks. From Unknown Fri Jan 05 12:36:14 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.inc.net!news.uoregon.edu!news.u.washington.edu!news.alt.net!news1.alt.net!news.exodus.net!aimnet.com!news.ossi.com!agate!howland.reston.ans.net!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Reselling the home brew equipment Message-ID: <1996Jan4.163659.21155@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4cf5k1$4dd@service-2.agate.net> Date: Thu, 4 Jan 1996 16:36:59 GMT Lines: 53 In article <4cf5k1$4dd@service-2.agate.net> John Wilcox/NS1Z writes: >Was talking with my buddy this evening on the subject of buying and >selling home brew gear. It was my opinion that home brew gear took such a >beating at the sales table/tailgate due to the fact that most hams >believe that no other ham has any construction skills and therefore, any >equipment built by Mr. No Skill is worthless, except for the parts (which >may or may not be any good!). Is this the way it is in your area of the >world? What would make a piece of HB gear more valuable to the astute >buyer? Most homebrew gear has no documentation, no support, and may be one of a kind. Now used commercial gear may have no documentation too, but you can usually find some, either from the manufacturer or from other users. If the commercial gear is relatively recent, it may also still have manufacturer support and parts available. Even if it is old, there are likely thousands of other units out there as points of potential salvage (see Micor or GE Mastr). Your homebrew offering has none of this. It is like an orphaned piece of equipment from a defunct company. Unless there's some collector value, people won't usually pay more than salvage prices for that type of gear. Now that should give you an idea how to increase the value of your homebrew gear on the market. Make sure there is full documentation, operating instructions, schematics, theory of operation, parts lists, and even X-ray view board layouts if applicable. This should all be nicely organized and bound, and included with the equipment. The equipment will still be an orphan, but it will be a more valuable orphan because of the information that would otherwise have to be puzzled out by the buyer. (This is *very* important to me.) As to builder skill, I treat this somewhat the same way I would when buying a used Heathkit. I look at the unit and see how professional it looks. Someone who has taken the time to make up professional looking panels, who has soldered neatly, and who has paid attention to wiring dress, probably also took some care in design. Therefore I'm more likely to pay a good price for something that *looks* like quality equipment than I am for something that looks like Rube Goldberg haywire junk. If the seller will additionally be willing to demonstrate the equipment, and/or offer a brief warranty period, then I'm *much* more likely to pay him a better price. In short, the closer your homebrew gear approaches commercial standards and practices, the closer I'm willing to pay comercial prices. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From Unknown Fri Jan 05 12:36:15 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: 4 Jan 1996 17:15:13 GMT Organization: Hewlett Packard Corvallis Site Lines: 51 Message-ID: <4ch1v1$qi1@hpcvsnz.cv.hp.com> References: NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Gary@Techstds.al.bst.bls.com wrote: : I have been contemplating, for a few years, a home-brew ATU. Coincidentally , : I planned to use the Motorola 68HC11 micro-controller chip, just like the on e : in QST, because I have the development board for it. : The stimulating exercize, in my opinion, is developing the algorithm to : iterate to the match (with the L network, there's only one). I had thought : that both the phase and magnitude of the impedance (seen by the ATU) would b e : needed to drive the iteration routine for both the capacitance and inductanc e. Over 25 years ago, I worked on the Collins 490T antenna tuner when I was in the Navy. That box will tune a "random wire" antenna pretty much anywhere in the 2-30MHz range. It has no processor: it uses a rather small array of silicon controlled switches to sequence through its procedure. It is rated to tune a new load within 5 seconds, but our rule of thumb was that if it took over a second and a half, it likely had a problem. It used motor-driven vacuum variables and inductors. It did have both phase and SWR sensors. Anyway, the point is that you don't really need a processor to accomplish the tuning procedure, though that's probably the easiest way to do it these days. But clearly, in the case of the 490T, the algorithm wasn't terribly complex, and AT LEAST there should be no reason for not providing plenty of detail about the procedure, if not the code itself. : So, when I saw the article, the first thing I looked for was the source code . : When I saw that it wasn't available, I was no longer interested. (Moved from the beginning of Gary's post...) : Excellent comments. I, too, am one of those people who grew up scrounging : parts from old TV's and radios. I enjoy thinking about, planning, obtaining : parts for, and building things much more than operating them. Me too. In fact, I still have no trouble scrounging all the parts I would need to do any of the basics of getting on the air, though I'm also interested in playing with things like DSPs, and I'm willing to pay for inexpensive evaluation boards that provide assemblers and similar tools. But on the other side of the coin: I sometimes get printed circuit boards that are loaded with parts that would be quite useful to someone homebrewing RF or audio equipment. I've found that I have trouble even _giving_ these things away. My conclusion is that there must just not be _that_ many people experimenting with electronics and homebrewing things, or else all those that are are getting all the free parts they need. -- Cheers, Tom tomb@lsid.hp.com From Unknown Fri Jan 05 12:36:17 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need AA-size dummy cell/bridge Date: Thu, 4 Jan 1996 17:43:00 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 13 Message-ID: References: NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Dave....why buy???? A proper sized wooden dowel and a piece of wire will do! Cliff Buttschardt W6HDO On Tue, 2 Jan 1996, David Feldman wrote: > I'm looking for a source of dummy cells, AA size. These would be used when > (for example) you want to use 6 alkaline (1.5V) cells in lieu of 7 nicad > (1.2V) cells and need to bypass one of the cells in a way that's mechanicall y > sound. Has anyone seen these for sale anywhere? > > 73 Dave WB0GAZ dgf@netcom.com > > From Unknown Fri Jan 05 12:36:18 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Thu, 4 Jan 1996 18:02:05 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 2 Message-ID: References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4ccgnl$kav@service-2.agate.net> <4ch6fi$hr7@ixnews8.ix.netcom.com> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4ch6fi$hr7@ixnews8.ix.netcom.com> Your comments and observations regarding the automatic antenna tuner article is right, spot on the money! 73 Cliff Buttschardt W6HDO From Unknown Fri Jan 05 12:36:18 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: ko4qc@ix.netcom.com(Joel Gamble ) Newsgroups: rec.radio.amateur.homebrew Subject: FT757GXII filter mod HELP!! Date: 4 Jan 1996 18:29:04 GMT Organization: Netcom Lines: 6 Message-ID: <4ch69g$ffg@cloner3.netcom.com> NNTP-Posting-Host: ix-cht-tn1-20.ix.netcom.com X-NETCOM-Date: Thu Jan 04 10:29:08 AM PST 1996 Can anyone help me with the modification that enables the Narrow CW filter to work on SSB?The rig is the FT757GXII.I understand it is different from the other FT757 models.Any help/suggestions/comments are welcomed. Thanks! Ko4qC From Unknown Fri Jan 05 12:36:20 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: mjsilva@ix.netcom.com(michael silva) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: 4 Jan 1996 18:32:18 GMT Organization: Netcom Lines: 33 Message-ID: <4ch6fi$hr7@ixnews8.ix.netcom.com> References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4ccgnl$kav@service-2.agate.net> NNTP-Posting-Host: val-ca1-21.ix.netcom.com X-NETCOM-Date: Thu Jan 04 10:32:18 AM PST 1996 In <4ccgnl$kav@service-2.agate.net> John Wilcox/NS1Z writes: >...What's the big deal, haven't seen anyone >complain about Yaesu, Kenwood or Icom not giving their stuff away..... The "big deal" to some of us is that the tuner was presented in a build-it-yourself article, not in a product review. It's disengenuous to publish a schematic for the whole world to see and at the same time decide the source code must be kept secret. In fact, some magazines require that source code be made available, via BBS or other methods. The greatest value in DIY articles is probably not in the constructing of exact clones, but in seeing how somebody else solved a problem, and in providing a starting point for trying something new. Many people might be interested in trying a similar circuit with a different micro installed, or in running the tuner from a PC, just as others would use different relays or other components. However, with the micro presented as a black box, we learn nothing of how the device works. We are presented with a hardware schematic but not with a software schematic. For those who say that it's unlikely that anbody would program their own chip, I'd just say look at the number of assemblers, compilers and programming devices on the market, compared to, say, the number of sources for toroid cores. The ability is there. I believe one of the authors has written that they did offer a detailed flowchart when they submitted their article, but QST chose not to print it. If that is the case then I think the authors are partially exonerated and QST is partially to blame. As I said, if they wanted to do a product review they should have called it a product review. 73, Mike, KK6GM From Unknown Fri Jan 05 12:36:21 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!prodigy.com!usenet From: CBAX63A@prodigy.com (Roland Geter sr) Newsgroups: rec.radio.amateur.homebrew Subject: "%%% WANTED COLLINS SC-101 %%%" Date: 4 Jan 1996 18:37:46 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 8 Distribution: world Message-ID: <4ch6pq$1d8k@usenetp1.news.prodigy.com> NNTP-Posting-Host: inugap4.news.prodigy.com X-Newsreader: Version 1.2 Will pay cash and shipping for "dead or alive" unit ANY CONDITION!! Call me @ 800-399-4383 x765 24hrs. - ROLAND S GETER SR WB6LNA CBAX63A@prodigy.com From Unknown Fri Jan 05 12:36:22 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!weld.news.pipex.net!pipex!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!lade.news.pipex.net!pipex!news.ftech.net!news From: Niels Montanana Newsgroups: rec.radio.amateur.homebrew Subject: 116 Oscillator Date: 4 Jan 1996 19:07:02 GMT Organization: Frontier Internet Services Lines: 3 Message-ID: <4ch8gm$1s1@alpha.ftech.net> NNTP-Posting-Host: lcpub.ftech.co.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) To: all Does anyone have a good circuit design for a 116Mhz oscillator with +17dbM output suitable for a 2m - HF transverter ? From Unknown Fri Jan 05 12:36:22 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!news.deltanet.com!usenet From: mikek@deltanet.com (Michael J. Krueger) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: Re: Motorola Handie-Talkie freqs? Date: Thu, 04 Jan 1996 21:39:47 GMT Organization: Delta Internet Services, Anaheim, CA Lines: 18 Message-ID: <4chkuj$ju0@news2.deltanet.com> References: NNTP-Posting-Host: delta1.deltanet.com X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.amateur.homebrew:12541 rec.radio.amateur.equipment:23411 Since you didn,t state the model #, They could be anywhere...... Best thing (and least expensive) is to borrow a frequency counter and check it out. Don't be suprised if you can't find the right PL tone on your Standard. HT-600's have non-standard and digital PL's. Good luck..... -Mike mfogarty@netcom.com (Michael Fogarty) wrote: >A friend has a pair of Motorola HT600's. They're two channel, commercial >grade HTs. Trouble is, they don't seem to say on which frequencies they >xmt and rcv. I'd like to be able to tune in with my Standard HT. Does >anyone have this information? >Thanks, >mfogarty From Unknown Fri Jan 05 12:36:23 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!istar.net!news1.ottawa.istar.net!fonorola!news.ottawa.istar.net!news.cyberplus.ca!not-for-mail From: Marcos Antonio Gallego Subject: How to build a TNC? Message-ID: <147cc$1471d.259@news.cyberplus.ca> Date: Fri, 05 Jan 1996 01:07:29 GMT X-Mailer: Mozilla 1.1N (Windows; I; 16bit) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii Lines: 8 Hi all, I'm looking for an article that can help me in how to build a TNC... Regards, Marcos From Unknown Fri Jan 05 12:36:24 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!europa.chnt.gtegsc.com!ra.nrl.navy.mil!lamarck.sura.net!newsfeed.internetmci.com!swrinde!news-relay.us.dell.com!pmafire!usenet From: Jack Mott Subject: 900 MHz Security Sender: usenet@pmafire.inel.gov (usenet guy) Message-ID: Date: Fri, 5 Jan 96 02:11:00 GMT MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Organization: WINCO Lines: 9 This posting is off-subject for this newsgroup, but I wanted access to the technical knowledge available here. I have a 900 MHz digital cordless phone (ATT 9100), and I am interested in how secure this type of phone is with respect to over-the-air eavesdropping. Please give a specific, technical answer addressing issues such as RF modulation and digital encoding. If you post a response, please also send e-mail. Charles Mott From Unknown Tue Jan 09 18:26:58 1996 Path: news.epix.net!news.sprintlink.net!quiknet3.quiknet.com!calweb!pagesat.net!netserv.com!aimnet.com!news.ossi.com!agate!howland.reston.ans.net!swrinde!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Question: RF Speech Processing Date: Fri, 05 Jan 96 08:23:25 GMT Lines: 22 Message-ID: <820873939.12121@pinetree.microserve.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 Rf speech processors normally use the SSB signal already present inside a transmitter. They clip this signal, then filter it with a second IF filter. In a 9 MHz IF, the harmonics generated by the clipping process fall around 18 MHz, 27 MHz etc., so they're easily removed by the second filter. I'm beginning to wonder if this is really necessary though, particularly if the processor is an outboard accessory. For example, say the outboard unit used a 6 MHz carrier oscillator, fed to a balanced modulator, in order to produce a 6 MHz double sideband signal. If that signal was clipped, won't the harmonics fall on 12 MHz and above? If so, the clipped signal could be filtered with an L/C low-pass filter, then converted back to baseband (audio) using a product detector and the same 6 MHz oscillator. This would eliminate the cost of two expensive filters. I've never seen this done, so maybe I'm overlooking something. Anyone know of a reason it won't work? 73, Jack WB3U From Unknown Tue Jan 09 18:26:59 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Tuner article Date: 5 Jan 96 15:13:45 GMT Organization: ucsd usenet gateway Lines: 36 Message-ID: <9600058208.AA820863233@mails.imed.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I foolishly posted several opinions on this subject over on qrp-l (or was it boat anchors?) just before the holidays. I had only scanned the article with the Christmas rush coming. Many of the posts criticizing the authors and QST have lamented not being able to take the article and produce a project ranging from totally built from scrounged parts to bought the kit from the authors and put it together. I find that this article allows exactly this range! I finally read the article carefully yesterday and found that, to the credit of the authors, the algorithm for setting the tuning is quite clearly described in the text in very general terms. I wish that QST had let them put in the flow chart (yech! We professional software types haven't used those in years) or other description of the algorithm to more precisely describe what is going on, but the prose is sufficient to do the job. I found that what a few others suggested is quite possible. There is enough information to use another processor or a PC to do the job. An old XT class machine that is otherwise only useful as a door stop would work quite well. You only need 16 DC control lines to run the relays so you could easily do it from the parallel port of any PC with just a few latches and decode circuitry. Then you need some sort of A/D converter to do the VSWR data collection. The board that is available could easily be modified to bring out the I/O lines for use with another controller if you don't want to roll your own. Gee. All that bandwidth! Ray Mack WD5IFS mack@mails.imed.com From Unknown Tue Jan 09 18:27:01 1996 Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!msunews!agate!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Fri, 05 Jan 96 16:36:20 PDT Organization: Northwest Nexus Inc. Lines: 19 Message-ID: References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> NNTP-Posting-Host: blv-pm10-ip5.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage I guess that I missed the start of this thread, but I've seen the article and like many of you, I was disappointed that the source code was hidden. It actually doesn't look like it would be all that difficult to duplicate the software, from the description in the article, I got the impression that the software varies the inductor for closest match and then varies the cap over all the combinations. In any case, I have to agree with the idea that it should have been called a product review instead of construction - and QST is doing this far too often. It isn't just software. A few months ago they published an article for an ATV transmitter and receiver (don't remember the exact frequency band) but the pcb pattern was not available for one of the components. Too bad you say, well with stripline components on the board it would be difficult to build without this additional information. 73 de KI7RH (Jay) From Unknown Tue Jan 09 18:27:02 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: MUENZLERK@uthscsa.EDU (Muenzler, Kevin) Newsgroups: rec.radio.amateur.homebrew Subject: 900 MHz Security Date: 5 Jan 96 17:14:00 GMT Organization: ucsd usenet gateway Lines: 42 Message-ID: <01HZNG0MNNJ6006G5K@uthscsa.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Fri, 5 Jan 96 02:11:00 GMT From: Jack Mott writes: - -This posting is off-subject for this newsgroup, but I wanted access to -the technical knowledge available here. I have a 900 MHz digital -cordless phone (ATT 9100), and I am interested in how secure this type of -phone is with respect to over-the-air eavesdropping. Please give a -specific, technical answer addressing issues such as RF modulation and -digital encoding. If you post a response, please also send e-mail. - -Charles Mott If you are worried about someone on their scanner listening in then there isn't a problem. All they will hear is a sound like a high speed modem. Your phone might also be spread-spectrum. If this is the case then anyone would be hard-pressed to lock in on your signal. As far as RF modulation, it is probably FM with 5kHz deviation. The digital sampling is sent in a packet form, short sections of encoded data with CRC error checking/correction. The handset and base "lock" onto each other with a specific "code" each time the handset is hung on the base and removed. This prevents someone, your neighbor for instance, from accidentally using your phone line with his ATT 9100 phone. This code changes each time the handset is placed on the base. This "code" is a 16 bit data word so there are 65536 combinations. The base will (should) ignore any handset that doesn't have the right code in the digital data stream. There is probably no encryption of the data. Since your phone and base are communicating back and forth with a digital signal it would be very unlikely that someone, even with the same model phone, would be able to tap into your conversation since the bogus handset would not be able to "lock" onto the data stream because the base would either ignore it (not the original caller) or would cause your handset to change channels because of interference from the bogus handset. Now I suppose someone could build a receiver that would decode the data stream in a "listen only" mode. They would have to know the exact encoding scheme that ATT used for that model phone. I hope this helps. Kevin, WB5RUE muenzlerk@uthscsa.edu From Unknown Tue Jan 09 18:27:04 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr7ip21.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Profitting from QST articles (long) Date: Fri, 5 Jan 1996 19:09:19 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 70 Distribution: world Message-ID: References: <4chf6s$gl9@mirrors.cellnet.com> <4cjkod$o1b@morgan.vf.mmc.com> NNTP-Posting-Host: usr7ip21.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4cjkod$o1b@morgan.vf.mmc.com> hbrown@ew0203.resd (Harry H. Brown) writes: >From: hbrown@ew0203.resd (Harry H. Brown) >Subject: Re: Profitting from QST articles (was QST Automatic Tuner Article) >Date: 5 Jan 1996 16:48:13 GMT >Does anyone know of anyone that has ever made money from an article in any ha m >magazine? I know several guys that have written several articles and they lik ely >have only increased the amount of time that they have donated back to the hob by. >I don't think they ever expected to make a cent. >As far as I am concerned, if one of them has the luck to make anything then >that's great. I'll be surprised though if it's anything close to minimum wage . >73, Harry, W3IIT I don't know what my position is on this thread; I can see it from both sides. I can tell you a personal story, however, which in my mind answers the profit question. I wrote and had published in the September 1979 issue of Ham Radio Magazine an article titled "Split-band Speach Processor". I was pleased to have it be the lead article and be featured on the cover. The article ran eight pages and I was paid $350. On a time and materials basis, I probably made well under a dollar an hour. The article included complete schematics, PC board artwork and parts placement drawings as well as design equations. I paid a friend $100 to lay out the boards and tape the artwork. This was in the days before word processors and auto-routers BTW. I offered no kits or PC boards. Shortly after publication, I began receiving requests for PC boards and I was forced to reply that I did not have a supply. I casually mentioned this to another friend who allowed that he would put up the funds to have some made and we could sell them and split the profit(?). So off we went and ordered 100 sets of boards at a cost of a shade over $700. No sooner having done this, and before taking delivery, I received a board in the mail from Circuit Board Specialists, along with a letter informing me that they would be selling boards for my project. I also noted that the boards were Hi-Fi; they even included the hr logo and MY call sign. Seeing our $700 suddenly go down the tube, I placed a call to Jim Fisk, Editor of hr. I naively thought that maybe he would use Copyright to prevent further production. He basically said he didn't care and "Oh, by the way, there will be a kit for your processor introduced shortly." What he didn't mention was that it would be introduced by Radiokit, his new company. Ethics. He did suggest that I run a classified ad in hr; which I did. We ultimately sold the 100 boards and another hundred too. I also sold, at cost, a Plessey IC that was readily available locally, but nowhere else in the world. We got $12 for the boards that cost a bit over seven. After figuring the time spent addressing envelopes, answering letters, etc., this was a loosing proposition too. Was it rewarding otherwise? You bet! I got letters and orders literaly from around the world. I learned how things are delivered into some foreign countries so the post office worker doesn't get them. I made some friends. One Australian club made it a club project, over ten years later. I got some deserved criticism, which I might add was dutifully published in hr along with my response. I got some glowing testimonials. I even got to answer questions from folks that bought from Radiokit. I hope I added a little something to the hobby. All in all, it was a great experience. Profitable monetarily? No way. Would I do it again? I dunno. I have some other article ideas. Would QST publish them? Probably not. If they did, would I try to make a buck? No. Do I have a problem with those that do? Ethically, yes. Pragmatically, no. End of story, thanks for listening. Regards, Wes -- N7WS From Unknown Tue Jan 09 18:27:05 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!usenet From: James Garland Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: 5 Jan 1996 20:47:33 GMT Organization: The Ohio State University Lines: 9 Message-ID: <4ck2p5$kup@pacific.mps.ohio-state.edu> References: <820873939.12121@pinetree.microserve.com> NNTP-Posting-Host: maps1.mps.ohio-state.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) That's a great idea, Jack, but I'm afraid you're not the first to think of it. As I recall, there were several audio processors on the market during the 70's which used the basic idea: mix an audio-derived DSB signal up to an IF (usually 50-500KhZ), clip it, then mix it back to audio. ETO sold one of these units, if I remember correctly, as did VOMAX. I also recall reading a do-it-yourself article on the concept in one of the ham mags -- probably Ham Radio. Jim W8ZR From Unknown Tue Jan 09 18:27:07 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr7ip52.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: Fri, 5 Jan 1996 21:28:28 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 36 Message-ID: References: <820873939.12121@pinetree.microserve.com> <4ck2p5$kup@pacific.mps.ohio-state.edu> NNTP-Posting-Host: usr7ip52.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4ck2p5$kup@pacific.mps.ohio-state.edu> James Garland writes: >From: James Garland >Subject: Re: Question: RF Speech Processing >Date: 5 Jan 1996 20:47:33 GMT >That's a great idea, Jack, but I'm afraid you're not the first to think >of it. As I recall, there were several audio processors on the market >during the 70's which used the basic idea: mix an audio-derived DSB >signal up to an IF (usually 50-500KhZ), clip it, then mix it back to >audio. ETO sold one of these units, if I remember correctly, as did >VOMAX. I also recall reading a do-it-yourself article on the concept in >one of the ham mags -- probably Ham Radio. >Jim W8ZR The Comdel CSP-11 was another one. There are some intermodulation products to contend with tho. Maybe Bill Sabin will help us here. Some references: "R.F. Clippers for S.S.B." by William Sabin, W0IYH, QST, July 1967. "Ordinary and Processed Speech In S.S.B. Application" by Harold Collins, W6JES, QST, Jan 1969. "Speech Clipping in Single-sideband Equipment" by Walter Schreuer, K1YZW, ham radio magazine, Feb 1971. "Performance of RF SPeech Clippers" by Leslie Moxon, G6XN, ham radio magazine, Nov 1972. "Split-band Speech Processor" by Wes Stewart, N7WS, ham radio magazine, Sept 1979. From Unknown Tue Jan 09 18:27:08 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech!newsjunkie.ans.net!news.agt.net!news From: smason@agt.net (Steve Mason) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Fri, 05 Jan 1996 21:36:33 GMT Organization: AGT Ltd. Lines: 15 Message-ID: <30ed97c4.2898071@news.agt.net> References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <1996Jan5.154927.25538@ke4zv.atl.ga.us> NNTP-Posting-Host: clgrpt06-port-30.agt.net X-Newsreader: Forte Agent .99c/16.141 On Fri, 5 Jan 1996 15:49:27 GMT, gary@ke4zv.atl.ga.us (Gary Coffman) wrote: >I reread the article carefully last night. From the author's description, >the algorithm *is* just a brute force search. First the L is stepped for >lowest VSWR, >That seems horribly crude, and only works at all because the L network > The assumption seems to be that as long as the VSWR is below 1.5:1 > the no-tune transceiver will be happy so that's "good enough". Does anyone know if the SGC autotuners do it differently, and are any better? Steve VE6STV From Unknown Tue Jan 09 18:27:09 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Question: RF Speech Processing Message-ID: <1996Jan6.001036.28036@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <820873939.12121@pinetree.microserve.com> Date: Sat, 6 Jan 1996 00:10:36 GMT Lines: 32 In article <820873939.12121@pinetree.microserve.com> jackl@pinetree.microserve .com (WB3U) writes: > >Rf speech processors normally use the SSB signal already present >inside a transmitter. They clip this signal, then filter it with >a second IF filter. In a 9 MHz IF, the harmonics generated by the >clipping process fall around 18 MHz, 27 MHz etc., so they're easily >removed by the second filter. I'm beginning to wonder if this is >really necessary though, particularly if the processor is an outboard >accessory. > >For example, say the outboard unit used a 6 MHz carrier oscillator, >fed to a balanced modulator, in order to produce a 6 MHz double >sideband signal. If that signal was clipped, won't the harmonics >fall on 12 MHz and above? If so, the clipped signal could be >filtered with an L/C low-pass filter, then converted back to >baseband (audio) using a product detector and the same 6 MHz >oscillator. This would eliminate the cost of two expensive filters. > >I've never seen this done, so maybe I'm overlooking something. >Anyone know of a reason it won't work? I haven't worked through the math, but I think the problem is with clipping DSB. If the clipping isn't perfectly symmetric, IE both positive and negative frequency, some horrible *in-band* distortion products are likely to be produced. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From Unknown Tue Jan 09 18:27:10 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!in2.uu.net!EU.net!Belgium.EU.net!ping.be!news From: Geert.Pirens@ping.be (Geert Pirens) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help with a phonetap! - phone.txt [01/01] Date: Sat, 06 Jan 1996 02:38:55 GMT Organization: PING Belgium Lines: 2 Message-ID: <4ckn5l$lg8@ping1.ping.be> References: <42pjbb$crg@news2.deltanet.com> NNTP-Posting-Host: dialup58.hasselt.eunet.be X-Newsreader: Forte Free Agent 1.0.82 From Unknown Tue Jan 09 18:27:11 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!EU.net!howland.reston.ans.net!math.ohio-state.edu!jussieu.fr!fdn.fr!uunet!in2.uu.net!news.compuserve.com!news.production.compuserve.com!news From: Dave'Doc'Reid <101454.3715@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,uk.radio.amateur Subject: DRCP ham radio kits on WWW Date: 6 Jan 1996 04:10:37 GMT Organization: D.R.Computer Products Lines: 27 Message-ID: <4cksnt$ib0$3@mhade.production.compuserve.com> Xref: news.epix.net rec.radio.amateur.homebrew:12561 rec.radio.amateur.misc:96535 uk.radio.amateur:9940 Hi all, a new update to the pages of D.R.Computer products radio related kits is now available on the WWW. http://ourworld.compuserve.com/homepages/drcp we have an Iambic Keyer on a 1 inch PCB.... and a morse tutor on a 1 inch PCB... and details of other developments... Have a wander around and enjoy.... If you want more detail - I can email direct text versions for those of you without WWW access... just ask 73 de Dave'Doc'Reid email 101454.3715@compuserve.com packet G0BZF @ GB7DEO (not for business) cheers -- Dave 'Doc'Reid Owner and proprieoter of D.R.Computer Products Bringing radio amateurs everywhere into the digital age Callsign G0BZF GQRP # 3677 RSGB (UK organiser of LY96BDX) From Unknown Tue Jan 09 18:27:12 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!usenet From: "C. J. Hawley Jr." Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Sat, 06 Jan 1996 10:45:08 -0600 Organization: University of Illinois, Urbana-Champaign Lines: 37 Message-ID: <30EEA714.218E@aries.scs.uiuc.edu> References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4ccgnl$kav@service-2.agate.net> <4ch6fi$hr7@ixnews8.ix.netcom.com> <30ec4d95.101599064@news.agt.net> <1996Jan5.182946.26351@ke4zv.atl.ga.us> NNTP-Posting-Host: antwerp-1.slip.uiuc.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) Gary Coffman wrote: snip > Upon reflection, I frankly don't fault the author at all. I think that > it is the editors of QST who have committed a serious error of judgement > here, and who have authorized payment of League funds for the privilege > of printing what amounts to an *advertisement*. That's not the way it's > supposed to work. The company is supposed to pay QST for carrying its > ads. (I'm assuming QST paid the regular feature article rate for this ad. > If they didn't pay, then I'm only upset by them misleading us that this > is a real construction article rather than what amounts to a reprint of > a kit assembly manual.) > > Gary I agree with you (and others) completely. The issue here is with OUR publicati on QST and how we want it to be run. I think the authors are nice persons and are just taking advantage of the free advertising. It's interesting how many have changed the subject when they reply to this pos ition on QST and what we thought QST was about. I have gotten beat over the head wit h everything from "smatter...you too cheap to pay a few bucks for the three cent s per hour hard work of the authors?" to "lighten up...big deal...if you don't like it don't buy it" to "there are a lot of people out there who will gain all sorts of benefit from building this kit, and if you think you're so above it go write y our own code". Someone even wrote that the authors have been swamped with orders ( which sounded like an endorsement of the decision to publish the article). Well, I'm not surprised. Five full pages in the magazine is a lot of coverage. Well, none of these arguments are the issue. There is nothing practical about the real issue, and nothing needs to be solved for me. This is about the concept o f a member publication of an organization run for the sake of the art. If no one i s interested in the art of amateur radio to write an article with no strings att ached for the sake of sharing the knowledge, then no one is interested. Period. I do n't think that the editors should approach that problem by changing the rules (I k now that I am assuming that I we agreed on some rules....maybe not). Chuck, KE9UW From Unknown Tue Jan 09 18:27:13 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: paul1@wizard.ucs.sfu.CA (Paul Erickson) Newsgroups: rec.radio.amateur.homebrew Subject: computer interface for qrp plus Date: 6 Jan 96 12:10:43 GMT Organization: ucsd usenet gateway Lines: 9 Message-ID: <9601061210.AA13272@wizard.ucs.sfu.ca> References: <199601041230.EAA10748@mail.ucsd.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I recently spoke with Bruce at Index labs and he said that he had heard that someone had built an interface for the qrp plus. Dose anyone know anything about this? cheers, Paul ve7cqk email: paul1@wizard.ucs.sfu.ca From Unknown Tue Jan 09 18:27:14 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!newsjunkie.ans.net!inet.d48.lilly.com!inet.d48.lilly.com!nntp Newsgroups: rec.radio.amateur.homebrew Subject: Re: Converting Cellular to 902MHZ band Message-ID: <1996Jan6.152610.7342@inet.d48.lilly.com> From: Michael Brown Date: 6 Jan 96 15:26:09 EST References: <4cf7kg$l7s@usenetp1.news.prodigy.com> Distribution: world Organization: Eli Lilly & Company, Inc. Nntp-Posting-Host: cis069.d51.lilly.com X-Mailer: Mozilla 1.22 (Windows; I; 32bit) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii Lines: 10 A local ham told me just the other day that he took an old cell phone apart, pulled out the final amplifier and is planning on using it for 900MHz. I don't have the details, and we haven't put in on the spectrum analyzer yet, but it should be able to be done. Michael Brown KG9DW From Unknown Tue Jan 09 18:27:15 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: Profitting from QST articles (long) Date: Sat, 06 Jan 96 15:29:43 PDT Organization: Northwest Nexus Inc. Lines: 26 Message-ID: References: <4chf6s$gl9@mirrors.cellnet.com> <4cjkod$o1b@morgan.vf.mmc.com> NNTP-Posting-Host: blv-pm2-ip29.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage In article , writes: > I wrote and had published in the September 1979 issue of Ham Radio > Magazine an article titled "Split-band Speach Processor". I was pleased > to have it be the lead article and be featured on the cover. The > article ran eight pages and I was paid $350. On a time and materials > basis, I probably made well under a dollar an hour. The article > included complete schematics, PC board artwork and parts placement > drawings as well as design equations. I paid a friend $100 to lay out > the boards and tape the artwork. This was in the days before word > processors and auto-routers BTW. I offered no kits or PC boards. > > Shortly after publication, I began receiving requests for PC boards and > I was forced to reply that I did not have a supply. I casuall mentioned > this to another friend who allowed that he would put up the funds to > have some made and we could sell them and split the profit(?). So off > we went and ordered 100 sets of boards at a cost of a shade over $700. > Interesting story Wes, I would guess that some magazines are more ethical than others. I also notice that may companies put Copyright notices on their PCBs, and I have adopted that practice. I don't know how much protection that would provide, but its worth a shot.... 73 de KI7RH (Jay) From Unknown Tue Jan 09 18:27:16 1996 Path: news.epix.net!news.sprintlink.net!ddi2.digital.net!usenet From: Jeff Hutchinson Newsgroups: rec.radio.amateur.homebrew Subject: Need Icom R-71A circuit board Date: Sat, 06 Jan 1996 16:23:11 -0500 Organization: Marine Electronics Services Lines: 3 Message-ID: <30EEE83F.45F0@digital.net> NNTP-Posting-Host: @pm8_18.digital.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) I'm restoring a sick R-71A receiver, and need a logic board. Anyone out there with one for sale or swap? Will buy a basket-case R-71 if the logic board is okay. Vy 73, from Jeff From Unknown Tue Jan 09 18:27:17 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!tank.news.pipex.net!pipex!newsfeed.internetmci.com!in1.uu.net!world!coopnews.coop.net!news.den.mmc.com!news.vf.mmc.com!ew0203!hbrown From: hbrown@ew0203.resd (Harry H. Brown) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Low Noise Linear Power Supplies Date: 6 Jan 1996 17:24:44 GMT Organization: Sun Microsystems Lines: 9 Distribution: world Message-ID: <4cmb8s$6b@morgan.vf.mmc.com> References: Reply-To: hbrown@ew0203.resd NNTP-Posting-Host: ew0203.resd.vf.ge.com A friend of mine used to design phase locked oscillators for communications sa tellites. These oscillators operated in the 400 or 500 MHz range and used a very high Q cavity. The power supply to the oscillator that they used was made by using a couple of series zener diodes with a fet as the "load resistor". This provided the re ference voltage to a current source that provided the power to the oscillator. The key was the zener diodes. The ones they used have very sharp knees and we re made by TRW at the time. I'm not aware of TRW still being in the business b ut other companies provide sharp knee zeners that may provide the characterist ics needed. My friend said that the zeners had a very steep slope of voltage v s current which resulted in a very stable reference source. There are other parameters to consider obviously since at least one design of a noise bridge back in the early 70's used a zener as the noise source. 73, Harry, W3IIT From Unknown Tue Jan 09 18:27:18 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!tank.news.pipex.net!pipex!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!slip3-3.acs.ohio-state.edu!user From: rlong@magnus.acs.ohio-state.edu (Ron Long) Newsgroups: rec.radio.amateur.homebrew Subject: Help with MC68HC705C8 Programming Date: 6 Jan 1996 17:59:12 GMT Organization: The Ohio State University Lines: 14 Message-ID: NNTP-Posting-Host: slip3-3.acs.ohio-state.edu Hello, I want to program a OTP (one time programmable) Motorola microcontroller MC68HC705C8 using a circuit given in the Motorola manual which transfers data from a 2764 eprom into the controller. The question is the data book is unclear about the programming voltage (Vpp). At one place it says 16 V maximum but it never gives a typical or 'correct' voltage? 12 Vdc? Is 13.8 Vdc ok? Thanks for any help. Ron, w8gus. From Unknown Tue Jan 09 18:27:19 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!ohstpy.mps.ohio-state.edu!garland From: garland@ohstpy.mps.ohio-state.edu (JIM GARLAND) Newsgroups: rec.radio.amateur.homebrew Subject: QST Antenna Tuner Kit-First Impressions Message-ID: <1996Jan6.185503.8669@ohstpy> Date: 6 Jan 96 18:55:03 -0500 Organization: The Ohio State University, Department of Physics Lines: 45 Having started all the commotion about the QST automatic tuner article with my posting several weeks ago, I decided to buy the "kit" and take a first-hand look at the product. I haven't wired it yet, but thought I'd offer my first impressions on the unassembled components and documentation, since there seems to be a great deal of interest in the tuner. What arrived is, in fact, a full-fledged kit, with an eleven page assembly manual that includes a parts list, parts placement drawing, suggested front panel layout, and carefully drawn sketches on wiring up the toroids. A schematic is included, as is a bloc k diagram and a front panel wiring diagram. The manual is nicely written with step-by-step instructions that fall only slightly short of Heathkit quality. Predictably, no information is given about the software, but it is noted that future upgrades will ba available for about $10, with trade-in of the old 68HC11 chip. The parts are packaged nicely, with the eight toroid cores comprising most of the weight. All the components are off-the-shelf pieces, that one could buy at Digikey or similar suppliers. Two SO239 connectors are also supplied. My only quibble with the kit is the printed circuit board. The board itself is of high quality. It is double-sided, with thru-plated holes, green solder-masking, and silk-screened component outlines shown in white. My concer n about the board is that the large majority of the traces seem to be extremely thin. I couldn't measure them, but I'd guess a maximum width of 10 mil, and probably less, perhaps even 6-7 mil. (all the relay control lines are wired this way.) Further, the pad sizes seem too small relative to the holes in the pad. I'm not an expert at PCB layout, but I'd think that a pad should have a minimum of 10-15mil of metal around each hole. The majority of holes on the board have significantly less metal than this. In fact, a majority of the holes were drilled slightly off-center in the pads, so that there is no metal at all on one side of the hole! IMHO it is regretable that the board was laid out this way, since components a re quite widely spaced and significantly thicker traces could have been specified. I'm worried that the slightest flexing of the board (as might occur in mobile service) may break hairline traces. I'm also worried that pads may come loose at soldering temperatues, since there is so little metal adhering t o the board. If you're thinking about buying the kit, you might want to keep these points in mind. It's a shame, really, because a great deal of care and thought went into putting the kit together. More, when I have the kit up and running. Jim W8ZR From Unknown Tue Jan 09 18:27:20 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: Sun, 07 Jan 1996 05:34:29 GMT Organization: Arizona Daily Star - AZSTARNET Lines: 88 Message-ID: <4cnm2u$cdd@news.azstarnet.com> References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <4cmp0n$2fb@newsbf02.news.aol.com> NNTP-Posting-Host: usr1ip12.azstarnet.com X-Newsreader: Forte Free Agent 1.0.82 w8jitom@aol.com (W8JI Tom) wrote: >In article <4ck2p5$kup@pacific.mps.ohio-state.edu>, James Garland > writes: >>That's a great idea, Jack, but I'm afraid you're not the first to think >>of it. As I recall, there were several audio processors on the market >>during the 70's which used the basic idea: mix an audio-derived DSB >>signal up to an IF (usually 50-500KhZ), clip it, then mix it back to >>audio. ETO sold one of these units, if I remember correctly, as did >>VOMAX. I also recall reading a do-it-yourself article on the concept in >>one of the ham mags -- probably Ham Radio. >>Jim W8ZR >> >> >Hi Jim, >The Vomax was a split band audio processor which is superior to RF >processing. I still use a modified VOMAX with my 751A. >Wes N7WS had a nice article in some magazine years ago, it was good enough >to be copied (hopefully he was compensated) and sold by two other >companies. I wish! >I see Gary's point. If an unfiltered DSB signal is clipped and re-mixed to >audio, it will have extra unnecessary distortion products in the output. >But I have no feel for the level. I posted on this before, but hadn't read Jack' s post carefully enough to see that he was talking about a *DSB* signal. The Comdel approach that I mentioned was an *SSB* processor. As Gary and Tom note, there will probably be a distortion penalty to pay. You also have to be very careful to have the clipping occur only in the clipping circuit, not elsewhere where it is uncontrolled. >Splitting into sub-bands, processing, filtering, and re-combining is >always the best approach. As long as correct phase between signal channels >is maintained. Hopefully Wes will show up, since he designed a system. I'm here! I agree, although, you must be very careful to minimize lower frequency distortion ahead of the first band-splitting filters. Distortion products are harmonics and if the input signal contains them, they can pass into one of the higher frequency filters, where if they are small enough, they remain unclipped. Meanwhile, the higher amplitude, lower frequency signal is clipped, ie. its amplitude is reduced. Coming out of the second set of filters, the two signals are combined and... oops; compared to the fundamental, the harmonic amplitude has actually increased. The distortion has increased by the clipping ratio; exactly what we don't want. Of course, we usually analyze these things under steady-state conditions. With speech, this is much less of a problem. >73 Tom 73, Wes Some references: "R.F. Clippers for S.S.B." by William Sabin, W0IYH, QST, July 1967. "Ordinary and Processed Speech In S.S.B. Application" by Harold Collins, W6JES, QST, Jan 1969. "Speech Clipping in Single-sideband Equipment" by Walter Schreuer, K1YZW, ham radio magazine, Feb 1971. "Performance of RF SPeech Clippers" by Leslie Moxon, G6XN, ham radio magazine, Nov 1972. Letter to ham radio magazine, by L. R. Newsome, VK4LR, May 1975, pp 75-76. "Split-band Speech Processor" by Wes Stewart, N7WS, ham radio magazine, Sept 1979. Letter to ham radio magazine, by W. Schreuer, with response by W. Stewart, N7WS, Feb, 1980, From Unknown Tue Jan 09 18:27:22 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: lrware@aol.com (Lrware) Newsgroups: rec.radio.amateur.homebrew Subject: Ham Gods and Spectrum Analyzers (Was interesting question...) Date: 7 Jan 1996 06:52:18 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 20 Sender: root@newsbf02.news.aol.com Message-ID: <4coc5i$kpq@newsbf02.news.aol.com> References: <9600058208.AA820863233@mails.imed.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4chl02$1te@soap.news.pipex.net> fj91@dial.pipex.com (Andy Green) writes: >Things I know: > information posted by: >Gary Coffman KE4ZV >Destructive Testing Systems >534 Shannon Way >Lawrenceville, GA 30244 >gary@ke4zv.att.ga.us Bravo! Do we have an ex spectrum analyzer designer among us? Concise discription of why a good spectrum analyzer is... -Larry Ware R&D Engineer GTI Telecom lrware@aol.com From Unknown Tue Jan 09 18:27:22 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!newsfeed.direct.ca!usenet From: duan klettke Newsgroups: rec.radio.amateur.homebrew Subject: INFO on Dumont 301-a oscilloscope Date: 7 Jan 1996 07:19:06 GMT Organization: Internet Direct Lines: 5 Message-ID: <4cns5a$7a@grid.direct.ca> NNTP-Posting-Host: 204.174.242.31 I have aquired a Dumont type 301-A Oscilloscope (ser. 6X81). If anyone has any info on this scope, ie. schematics,manual etc. I would very much appreciate you contacting me. Thank you. Duan From Unknown Tue Jan 09 18:27:24 1996 Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!van-bc!news.mindlink.net!agate!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: 7 Jan 1996 07:38:37 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 24 Sender: root@newsbf02.news.aol.com Message-ID: <4coesd$mg7@newsbf02.news.aol.com> References: NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article , Jay Wicklund writes: >The difference between the 20A and the 20B seems to be that the 20B has a >somewhat better spec on clamping resistance and slightly lower clamp >volt. > >My book doesn't show the other two parts, but I would guess that the LA13 >is inbetween the LA10 and LA20. > >If anyone would like, I could fax a copy of this page of the book to you. > >73.....KI7RH (Jay) I wonder if anyone looked at the voltage a MOV requires before the resistance really drops a lot, and compared that to the current the device you are protecting would be drawing at the same voltage. It's been a while since I looked at them, but when I did they almost were worthless for power line protection. 73 Tom From Unknown Tue Jan 09 18:27:25 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!nntp.coast.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: steveclby@aol.com (Steve Clby) Newsgroups: rec.radio.amateur.homebrew Subject: E-V Microphone FS Date: 7 Jan 1996 13:03:52 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 14 Sender: root@newsbf02.news.aol.com Message-ID: <4cp1u8$ic@newsbf02.news.aol.com> Reply-To: steveclby@aol.com (Steve Clby) NNTP-Posting-Host: newsbf02.mail.aol.com For Sale: ELECTRO-VOICE #664 Variable-D* Dynamic Cardioid Microphone, Variable Impedance Wired HI-Z, with original box. Has boom mount attachment (permanent) and includes adjustable boom (Appears to have been made from an adj. desk lamp base). Appears to be in VG-EX cond. Cable also included. I don't know the value of this mic and would appreciate your input or offer. Thanks for your consideration, Steve From Unknown Tue Jan 09 18:27:26 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!overload.lbl.gov!agate!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: steveclby@aol.com (Steve Clby) Newsgroups: rec.radio.amateur.homebrew Subject: Power Supplies FS Date: 7 Jan 1996 13:35:09 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 41 Sender: root@newsbf02.news.aol.com Message-ID: <4cp3ot$17v@newsbf02.news.aol.com> Reply-To: steveclby@aol.com (Steve Clby) NNTP-Posting-Host: newsbf02.mail.aol.com For Sale: (2) ELPAC OLV30-12 Power Supplies, 12v, 4.0A (Adj. 4v,6A. to 28v, 1.7A.) With Remote Sensing, (Instructions/Spec. Sheet Included) Guaranteed Specs: 1. Line Regulation: +/- .1% Output For +/- 10% Input Variation 2. Load Regulation: +/- .1% Output for No Load to Rated Load 3. Ripple: .1% P-P Output For No Load to Rated Load 4. Ambient Temperature: 0-55 degrees C Input: 120vac or 240vac I'm selling the (2) units together. One has been wired for 120VAC and is putting out 12V. The other unit appears to have been worked on and the AC cord has been removed. It may or may not work, so I'm selling it as is. $25.00 plus shipping for both. Also available: Variac V10-G3/POWER SUPPLY in steel cabinet with whisper fan and Simpson DC volt and amp. meters. Marked "General Radio" on handwritten tag inside case. 115v. Input 10a. 50-60 ~ I checked the output with a meter and it seems to range from 1 or 2v. to approx. 30v. Dial is calibrated from 0 to 130. It appears to be set up as a battery charger or transformer as it has (2) heavy output leads with battery style spring clamps. $75.00 plus shipping (heavy) Thanks for your consideration, Steve From Unknown Tue Jan 09 18:27:27 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: steveclby@aol.com (Steve Clby) Newsgroups: rec.radio.amateur.homebrew Subject: Multi-Pin Connectors FS Date: 7 Jan 1996 13:59:42 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 10 Sender: root@newsbf02.news.aol.com Message-ID: <4cp56u$1l5@newsbf02.news.aol.com> Reply-To: steveclby@aol.com (Steve Clby) NNTP-Posting-Host: newsbf02.mail.aol.com For Sale: I have picked up a number of military type multi-pin connector kits (female) with the connector housing and separate container of gold (plated?) pins. Ther are various manufacturers and some kits carry part numbers like "Bendix CE-10-185002-202" Assembled July, 1966. Anyone have any interest in these? Thanks, Steve From Unknown Tue Jan 09 18:27:28 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail From: gmfoster@cpcnet.com (Garry Foster) Subject: Re: QST Automatic Tuner Article Message-ID: <177cc$d1339.97@luzskru.cpcnet.com> Date: Sun, 07 Jan 1996 18:22:47 GMT Reply-To: gmfoster@cpcnet.com References: <128@bdam.win.net> <1996Jan5.154927.25538@ke4zv.atl.ga.us> <4cn0lc$dp7@hpscit.sc.hp.com> X-Newsreader: Forte Free Agent 1.0.82 Lines: 99 rkarlqu@scd.hp.com (Richard Karlquist) wrote: >In article <1996Jan5.154927.25538@ke4zv.atl.ga.us>, >Gary Coffman wrote: >> >>More interesting now would be a circuit that would yield both vector >>magnitude and phase for the uP to work with. Then we could optimize >>the network quickly for *best* match. Anyone have any candidate >>circuits that could be retrofitted to the design? >> >>Gary Due to all the intrest in the QST antenna tunner article I have generated a list of related articles I have on file. If any one has any others not listed I'd like to hear about them and try to obtain a copy. Electronics Dec 1951 "Automatic Impedance Matcher" by Virgil True This is a servo driven circuit that uses the Phase Magnitude detector that was standard in commerical military applications for years to come. Qst July 1952 "A Phase Detector for RF Transmission Lines" by Robert Mezger W2BLL A description of the Phase detector with vector diagrams ect. QST August 1952 "Automatic Tunning of the Antenna Coupler" by Walter A. Knoop. This is a stab of an Auto tunne for a link coupler for ballanced lines. Uses a phase detector and addresses the problem of the link keeping the circuit from exact reasonance. Serries capacitor in serries with the Link. Inresting reading for those of you using balanced feed. CQ December " 1952 "The True Matcher" by Capt. R. R. Hay USN W4LW This is a description of a phase magnitude indicator. CQ July 1953 " Additional Notes on the True Matcher." by Capt R.R. Hay Capt. USN W4LW CQ January 1954 "Problems in Automatic Antenna Tunner Design" by Capt R.R. Hay USN W4LW. CQ June 1954 "The Automatic Match" by Capt R.R. Hay Capt. USN W4LW. Capt Hay puts his Phase magnitude detector to work driving servos to match his system. CQ Feb 1956 "RF Phase Sensing Unit and Impedance Magnitude Indicator" M.K. Brooks and W. Brooks QST Dec. 1956 "Automatic Antenna Tunning for the Amateur" by Lois Hutton W0BQF. He did it right way back then.....Look Ma no Transistors.....My words not his CQ Jan 1962 "Building and Using the Coax Phase Detector" by David Geiser Wa2ANU. Good article on building a phase detector principle. CQ August 1962 "How The Coax Phase Detector Works" by David T. Geiser. A folowup article digging in to the theory of an earlier constructon article. 73 July 1979 "Tennamatic: An Auto-Tuning Mobile Antenna System" B.F. Brown W6TWW This isn't a tunner per say but resonants the Antenna. Is still used on the popular screwdriver types of antennas however you must move the coil to the proper band as it ignores the impedence. Great article. QST April 1980 "A T-Network Semi-automatic Antenna Tunner" Bill Imamura JA8GW This is a VSWR only driven tunner. QST July 1980 "The Impedance Match Indicator" by David Geiser " WA2ANU Another tutorial on the phase and Magnitude detector with a good construction article. QST October 1982 " Mobile Antenna Matching --Automatically!" Don Johnson W6AAQ This is a re write of the July 1979 "73" article. Also both articles are in the book"40 +5 years of HF Mobileing" by Don Johnson. Published by World Radio . CQ April 1987 "CQ Reviews the Icom AH-2 HF Mobile Antenna System" Lew McCoy W1ICP This is a review but includes the schamatic. Notice it is Phase and Impedance driven. Very similar to the current QST article. If anyone looks at this circuit I'd like thier opinion on the purpose C165-167. Is this only so they can advertise it as a pie tunner? QST January 1996 "An Automatic Antenna Tunner: The AT-11" by Dewayne Kincaid WD8OYG This is the first digitial based tunner article I have on file. (Except for the review if the Icom AH-2) . It is also the first construction article that witholds information on the operation of the unit. It is also the first construction article that gives the project a product type name the "AT-11" Lots of firsts here and not all of them good IMHO> Garry WB0NNO From Unknown Tue Jan 09 18:27:31 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail From: gmfoster@cpcnet.com (Garry Foster) Subject: Re: QST Automatic Tuner Article Message-ID: <177cc$d141.101@luzskru.cpcnet.com> Date: Sun, 07 Jan 1996 18:22:52 GMT Reply-To: gmfoster@cpcnet.com References: <128@bdam.win.net> <1996Jan5.154927.25538@ke4zv.atl.ga.us> <4cn0lc$dp7@hpscit.sc.hp.com> X-Newsreader: Forte Free Agent 1.0.82 Lines: 64 rkarlqu@scd.hp.com (Richard Karlquist) wrote: >In article <1996Jan5.154927.25538@ke4zv.atl.ga.us>, >Gary Coffman wrote: >> >>More interesting now would be a circuit that would yield both vector >>magnitude and phase for the uP to work with. Then we could optimize >>the network quickly for *best* match. Anyone have any candidate >>circuits that could be retrofitted to the design? >> >>Gary >There have been a handful of articles in ham publications over the >years on automatic antenna tuners and most have used a standard >design of a phase and magnitude indicator. This standard design >is very similar to wattmeter designs that involve passing the center >conductor of a transmission line thru a big toroid to sense line >current, then take the dot product of it with the line voltage >(easily sensed with a capacitive voltage divider). By a slight >rearrangement of things you can instead get an indication of >phase (capacitive or inductive) and magnitude (greater or less than >z-zero). The resulting device is sort of a cross between a wattmeter >and a VSWR meter, in terms of constructional characteristics. >Anyone have a non-obscure article citation that describes one of these? >A dumb old analog control circuit using one of these >phase/magnitude sensors can run rings around most VSWR only circuits, >even if they use a secret digital algorithm. I know of a commercial >tuner that could lock up in less than 1/2 second to any matchable >load, without presetting from a look up table. Didn't even have >a microprocessor either. I don't understand all the excitement about >the QST article. I wouldn't want the design if it was free. >Rick Karlquist N6RK >rkarlqu@scd.hp.com Well I have seen several servo tuners but never seen one that could move very far in 1/2 second. Most took several seconds to turn a rolller inductor thru a gear head motor. However they all did use a phase magnitude detector. I do have to say that I have a great deal of respect for the circuit in this article as I haven't seen anyone else publish anything better. And a few years ago QST published a servo driven VSWR driven circuit that was just awfull. Also the magnitude detectors usually try and determine if the load is greater than or less than 50 ohms. Several of the circuits in the ham publications over the years have only used phase detectors which required you to manually get in the band. The Ten a Matic for example. Other wise they will tune you to the equivalent of a 1/2 wave or any other resonant length. A good description of the phase detector is in a couple of articles by David Geiser Wa2anu CQ Aug 1962 and then in the July 1980 QST. In the Qst article he also covers the magnitude(impedence) detector(indicator). In another message is a list of the related articles I have if any one is intrested. Garry WB0NNO From Unknown Tue Jan 09 18:27:32 1996 Path: news.epix.net!plum.epix.net!gmfoster From: Garry Foster Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Sun, 7 Jan 1996 21:15:05 -0500 Organization: epix.net Lines: 19 Message-ID: References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4ccgnl$kav@service-2.agate.net> NNTP-Posting-Host: plum.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4ccgnl$kav@service-2.agate.net> Snip. > antenna on the rear bumper. What's the big deal, haven't seen anyone > complain about Yaesu, Kenwood or Icom not giving their stuff away..... > -- > John Wilcox / NS1Z > 44.118.6.4 > ns1z@ns1z.ampr.org > 204.117.6.48 > ns1z@rumford.agate.net > > ns1z @ kb1bsc.fn44rn.me.usa.noam What was the last Yaesu, Kenwood or Icom project you saw as a lead howto article. In fact what was the last article on one of these manfg. products that wasn't a review or paid advertisment? And you really should move the unit to the base of the antenna or as close as you can get it. Garry WB0NNO From Unknown Tue Jan 09 18:27:34 1996 Path: news.epix.net!plum.epix.net!gmfoster From: Garry Foster Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Sun, 7 Jan 1996 21:26:09 -0500 Organization: epix.net Lines: 105 Message-ID: References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> NNTP-Posting-Host: plum.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Well Stated ! In fact all the ARRL rigs are now big comerical units from what I have heard. More like a coastal station for ships at sea. The ARRL has all the tools to do board design and maybe even fab. Why isn't this offered as a service to the members for projects such as this tunner? Why aren't the lab services in general more available to the membership or are they and I'm just unaware of it? Garry WB0NNO On Wed, 3 Jan 1996, James Griffith wrote: > In article <4c6es2$394@mgate.arrl.org>, ehare@arrl.org says... > > > >griffithj@ricks.edu (James Griffith) wrote: > > > >>>QST is sold at most major news stands and magazine racks now. You > might > >>want to try that. The artical is not that big a deal. It's an > >>advertisment so its writer can make money. It would be difficult to > >>duplicate without buying their kit. QST is going same way Popular > >>Electroncs went years ago, selling kits with articles. > > > >Hello, Jim, > > > >I don't kwow if I would go *that* far. First, ARRL doesn't sell the > >kits; the authors do. From the feedback we have received from readers, > >most readers *prefer* construction articles that have kits. And, in > most > >cases, even if a construction project has a kit, the builder can still > >dead-bug it, if he or she chooses. This tuner article is almost an > >exception to the rule, in that it requires a part that is available only > >from the author. However, the author will gladly sell the > >progrmammed IC only for those who want to locate all the other > >parts themselves. (I wonder if *anyone* will take him up on the > >offer; I want the kit! :-) ). > > > > > >> > > > >I don't mean to sound like a "wet blanket", and I don't know your age, > mine is 52. But, I remember the exciting time when, with almost nothing > at all, one could get on the air with something he or she built. Or, if > you were intrested in just building an electronic project from Ppopular > Electronics, you were able, because at the age of 12 or 13 you didn't > have the money to by that one part that could only be bought from that > special place, who ever or were ever it might be. > > Have you ever longed to build something electronic at the age of 12 or > so, and had no money, but the author gave you a way to do in in the > article, like the code for the chip, or the turns count and size of the > coil. > > I believe,(This is only me talking.) and I am a member of ARRL and you > have published 2 very popular articles I wrote, at least my fan mail said > so, that QST is no longer a member publication devoted to ham radio, FOR > THE LOVE OF IT, but has gone into business, targeting those people who > would buy more magazines, (Your on the news stand now.) books, and other > offers the ARRL has, and has geared it QST publication toward them. > > Who are those people, (Me talking again.) thay are people who never grew > up in ham radio scrounging a part or a who rig full of parts to get on > the air, and if the truth be known, computer have the interest of the > young people, not ham radio. I can talk any were in the world on internet > who needs a radio. > > Those are the people targeted by QST. We all see the QRP articales, about > the only rig that can be built any more, if one can find a variable > capacitor. Have you even seen a dealer advertise a line of variable > capacitors in QST or any were elce. I have been in hard electronic repair > for 35 years, and I can fix hundreds of things not made anymore, or will > never be made again. Why, becasue it all gone to software, and QST won't > publish it so we can use are new skills and try and program our EPROM or > processor chip, we have to buy it, just like Popular Electronics. > > When is the last time we saw a 75 watt Novice rig in QST built and > presented by the ARRL lab. Packet is the revolution for those with > interest in computers. I can use computers, and repair them, thank you. I > tried packet and sold it. My time is better spent on something that is > real time then waiting on the postman. > > I, and people like me, are no longer the interest of the ARRL, or QST. I > love ham radio. It has gotten me good jobs from the skills it has given > me. I have talked to lots of people. Years ago thay all built something, > today most do not even own a good soldering iron. QST know that. I, and > the 12 and 13 year olds are no longer the target, the kit builder, and > the buyer of new equipment is because there in no money in me and a 12 > year old. There never has been any money in me and my kind in ham radio > because we build from parts, which there is no money in. > > We are the ones that some QST articles have made fun of because we see a > good deal in a broken radio, and can fix it, or see the value in a pile > of junk that know one elce can recognize, and are no longer recongnized > by QST. > > That is why the missing chip code to the ATU article is importent. Not > because you can build the unit by odering the part, but because you can > not say, on the air, I programed the chip myself from and article in QST. > > > > From Unknown Tue Jan 09 18:27:35 1996 Path: news.epix.net!peach.epix.net!gmfoster From: Garry Foster Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Sun, 7 Jan 1996 21:40:14 -0500 Organization: epix.net Lines: 21 Message-ID: References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> NNTP-Posting-Host: peach.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: On Fri, 5 Jan 1996, Jay Wicklund wrote: Snip > > In any case, I have to agree with the idea that it should have been > called a product review instead of construction - and QST is doing this > far too often. It isn't just software. A few months ago they published And if its aproduct review should the company be doing the review? Garry WB0NNO Snip > 73 de KI7RH (Jay) > > > > From Unknown Tue Jan 09 18:27:36 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: Sun, 07 Jan 96 22:52:27 GMT Lines: 55 Message-ID: <821098902.19663@pinetree.microserve.com> References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <4cmp0n$2fb@newsbf02.news.aol.com> <820988469.19749@pinetree.microserve.com> <1996Jan7.200411.6084@ke4zv.atl.ga.us> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 First, thanks to everyone for their comments on this subject. The RF processor in my previous rig was very effective and I'm looking for a way to build an inexpensive outboard replacement. Criticisms of the technique that I described are exactly what is needed. I think it would be useful to explore the various points that have been made in greater depth. gary@ke4zv.atl.ga.us (Gary Coffman) wrote: >You know what AM sounds like under selective fading, well the same >thing is possible here if the clipping of the upper and lower >sidebands isn't precisely symmetrical in both the amplitude and >frequency domains. The latter is what's different about DSB. >My gut feel is that it's important to use a carrier as high in >frequency as possible for modulating and demodulating the DSB signal >so that the percentage bandwidth is minimized and possible >asymmetries in the frequency domain are reduced. This is the first thing to consider, because it relates specifically to the decision of whether to use DSB. As in the previous example, let's say the carrier oscillator is 6 MHz. The DSB passband for audio frequencies out to 3 KHz will be 6 KHz. Therefore, the passband is 0.1% of the frequency of operation. If there are no tuned circuits between the balanced modulator and the clipping diodes, will frequency response irregularities due to non-symmetrical clipping really be a consideration? To go a step further, let's raise the carrier oscillator to something around 30 MHz. Now the passband width is only 0.02% of the frequency. Surely that would prevent this type of problem? Looking at this somewhat empirically, the RF processor in my previous rig clipped the SSB signal at an IF frequency of 3.18 MHz. Because it was SSB, the passband width was approximately 3 KHz. That means the passband width was 0.094%, only slightly less than the 0.1% for the DSB processor at 6 MHz. If this percentage bandwidth can be symmetrically clipped for SSB at 3.18 MHz, would you agree that non- symmetrical clipping probably won't be a factor with DSB at 6 MHz, assuming the circuitry is otherwise similar? >Another potential problem is reciprocal mixing in the demodulator. >The obvious solution to this problem is a lowpass filter between the >clipper and the demodulator. >A clean DSB clipper thus may need a filter of 34 db. Assuming the worst-case scenario of 34 dB is correct, the second harmonic products at 12 MHz are still a good distance away from the fundamental. Wouldn't something like a 7- or 9-element Chebyshev low-pass filter provide this degree of rejection? 73, Jack WB3U From Unknown Tue Jan 09 18:27:38 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: Sun, 07 Jan 96 22:54:32 GMT Lines: 52 Message-ID: <821099029.19663@pinetree.microserve.com> References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <4cmp0n$2fb@newsbf02.news.aol.com> <4cnm2u$cdd@news.azstarnet.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 n7ws@azstarnet.com (Wes Stewart) wrote: > ... you must be very careful to minimize lower frequency distortion >ahead of the first band-splitting filters. Distortion products are >harmonics and if the input signal contains them, they can pass into >one of the higher frequency filters, where if they are small enough, >they remain unclipped. w8jitom@aol.com (W8JI Tom) wrote: >Splitting into sub-bands, processing, filtering, and re-combining is >always the best approach. As long as correct phase between signal >channels is maintained. This points out some shortcomings in the split-band scheme that I hadn't thought of. I do have a few comments. First, maintaining the correct phase at the output of each filter is probably impossible because the shift will vary across each filter's passband. I'm not sure how significant this phase shift will be in terms of the percieved quality of the recovered audio, but having been in the audio business a number of years, it's a troublesome concept. Multiple-band phase shift is one of the characteristics of graphic equalizers said by many (including yours truly) to degrade their sound quality. This may not be a significant issue in this application, but I'd be very interested in a critical listening test of the audio quality of one of these processors (with the filters active but the clipping turned off). To clarify this a little, I'm not just referring to the amplitude cancellation that takes place as a result of phase shift, but also to the audible effects of the phase shift itself. Second, the possibility that the split-band processor might increase the overall percentage of harmonic distortion in the manner described above can't be overlooked simply by virtue of a low-distortion preamp/filter circuit. Most harmonic distortion encountered in audio is produced in microphones and speakers, not in the electronics. In this application, THD of the microphone will be impacted in the same manner as harmonic distortion produced in the input circuitry. Again, I don't know just how significant this factor is. In double-blind A/B tests, it's been shown that listeners often cannot identify harmonic distortion in music until it is above 5%. Below that level, most listeners detect a difference between the pure and intentionally-distorted programming, but they fail to identify it as distortion. In many cases, they will describe a signal with 1% or 2% THD as sounding louder than the original, but not as being distorted. Given the fact that speech lacks the sustained tones found in music, I suspect it is affected even less in terms of perceived distortion. 73, Jack WB3U From Unknown Tue Jan 09 18:27:39 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!usenet.logical.net!news From: ko2e@Pko2e.capital.net Subject: Re: Making PC boards from laser printer Sender: news@logical.net Message-ID: Date: Sun, 7 Jan 1996 23:13:39 GMT X-Nntp-Posting-Host: dialup087.colnny1.capital.net Content-Type: TEXT/PLAIN; charset=US-ASCII References: <4bd8a1$t1n@newsbf02.news.aol.com> <30da564f.89541169@news.solo.pipex.co.za> <4bv1to$97f@news.third-wave.com> Mime-Version: 1.0 X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage Lines: 5 I jumped in the group late and missed the original posting. Whats the story about laser print / circuit boards. I have used Tek Film with fair results. Please let me know... Ernie.. From Unknown Tue Jan 09 18:27:40 1996 Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet From: wave@mindspring.com (Pieter Ibelings) Newsgroups: rec.radio.amateur.homebrew Subject: FS. HP141T with 8552B IF UNIT. Date: 7 Jan 1996 23:42:16 GMT Organization: -.-. --.- -.. -..- Lines: 6 Message-ID: <4cploo$53u@brickbat.mindspring.com> NNTP-Posting-Host: wave.mindspring.com Mime-Version: 1.0 X-Newsreader: WinVN 0.93.11 Asking $500+Sh. Works great and it is in very good condition. Pieter Ibelings AC4OP From Unknown Tue Jan 09 18:27:41 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!newshost.convex.com!news.dfw.net!news From: David Mclean Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space Subject: Web Page with MODs, Calls lookup, Ham links, Swap page, and more!! Date: 8 Jan 1996 00:34:53 GMT Organization: Road Kill Cafe! Lines: 17 Message-ID: <4cpord$gok@fnord.dfw.net> NNTP-Posting-Host: dfw.dfw.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Xref: news.epix.net rec.radio.amateur.misc:96612 rec.radio.amateur.antenna:18314 rec.radio.amateur.digital.misc:13531 rec.radio.amateur.equipment:23497 rec.radio.amateur.homebrew:12589 rec.radio.amateur.policy:32440 rec.radio.amateur.space:6094 I would like to welcome all of you to my web page. The address of my web page is "http://www.dfw.net/~dmclean". I have many links that you will like. Here is a list of things that I have on my Web page: 1. Swap Page 2. Mods page 3. QRZ call lookup 4. Repeters freqs. 5. Links to F.C.C, A.R.R.L, and many more. Check it out. You will like it. -- David Mclean From The World of Hamradio KC5NNV is Clear! _________________________________________________________________________ ------------------------------------------------------------------------- From Unknown Tue Jan 09 18:27:42 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!ames!waikato!comp.vuw.ac.nz!central.co.nz!usenet From: barryl@central.co.nz@central.co.nz (Barry Lennox) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Eddystone SW radio won't work - Need help. Date: 8 Jan 1996 07:12:18 GMT Organization: Personal Lines: 17 Message-ID: <4cqg4i$1nb@central.co.nz> References: NNTP-Posting-Host: barryl.central.co.nz X-Newsreader: WinVN 0.93.14 In article , ai657@freenet.toronto.on.ca says... > > >I have recently aquired an Eddystone EC-10 SW radio. >It doesn't work. Snip Can't speak for the Toronto area as it's a bit ouside my shopping area ! However, if you get really stuck I can provide a circuit diagram for this set. They are good radios, given their age. E-Mail me with your postal address Barry Lennox From Unknown Tue Jan 09 18:27:43 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!ames!waikato!comp.vuw.ac.nz!central.co.nz!usenet From: barryl@central.co.nz@central.co.nz (Barry Lennox) Newsgroups: rec.radio.amateur.homebrew Subject: SDA 4213 Date: 8 Jan 1996 07:13:50 GMT Organization: Personal Lines: 4 Message-ID: <4cqg7e$1nb@central.co.nz> NNTP-Posting-Host: barryl.central.co.nz X-Newsreader: WinVN 0.93.14 Has anybody got any data on a SDA-4213 pre-scaler IC made by Siemens TIA, Barry Lennox From Unknown Tue Jan 09 18:27:44 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help with MC68HC705C8 Programming Date: Mon, 8 Jan 1996 12:55:07 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 27 Message-ID: References: NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Hi Ron...Hey it has been some time since we talked. I'll bet you are laughing at some of my efforts with the old TRS80 model 100, but the fool thing still works!! Regarding the MC68HC705C8, you might look in QEX starting at issue number 107 for Jan 1991. After that issue there were others in which contained terminals for RTTY, AMTOR were written up. The programming was difficult for those chips, three of which I still have not programmed effectively, but therein might be a clue for further investigation. Cliff Buttschardt W6HDO On 6 Jan 1996, Ron Long wrote: > Hello, > > I want to program a OTP (one time programmable) Motorola > microcontroller MC68HC705C8 using a circuit given in the > Motorola manual which transfers data from a 2764 eprom into > the controller. > > The question is the data book is unclear about the programming > voltage (Vpp). At one place it says 16 V maximum but it never gives > a typical or 'correct' voltage? 12 Vdc? Is 13.8 Vdc ok? > > Thanks for any help. > > Ron, w8gus. > > From Unknown Tue Jan 09 18:27:45 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!dsinc!newsfeed.pitt.edu!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Ham Gods and Spectrum Analyzers (Was interesting question...) Message-ID: <1996Jan8.145012.9602@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <9600058208.AA820863233@mails.imed.com> <4coc5i$kpq@newsbf02.news.aol.com> Date: Mon, 8 Jan 1996 14:50:12 GMT Lines: 13 In article <4coc5i$kpq@newsbf02.news.aol.com> lrware@aol.com (Lrware) writes: > >Bravo! Do we have an ex spectrum analyzer designer among us? No, just a spectrum analyzer user, and sometimes repairman. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From Unknown Tue Jan 09 18:27:47 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!dgf From: dgf@netcom.com (David Feldman) Subject: OLD 20M HB SSB/CW XCVR - early 60s? Message-ID: Organization: Organization? Me? Date: Mon, 8 Jan 1996 16:43:52 GMT Lines: 13 Sender: dgf@netcom9.netcom.com Somewhere in the 1960s (I believe) there was published a design article for construction of a SSB transceiver. It was all solid state, was intended for 20 meters, was about 1/4 watt output power, and specifically was designed to run from a 6 (not 12) volt power supply. It was about the size of a cigar box as I recall, and the author had intended to use it in his Volkswagen bug, hence the 6 volt power supply limitation. I'm trying to track down the article with this limited information. If you recall seeing something like that in one of your old magazines or handbooks, could you let me know the reference, or even better yet make a copy of the article? I think it was the first published design for a all solid-state transceiver for SSB, and I'm interested in duplicating it. 73 Dave WB0GAZ dgf@netcom.com From Unknown Tue Jan 09 18:27:49 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr5ip27.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: Mon, 8 Jan 1996 17:14:21 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 81 Message-ID: References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <4cmp0n$2fb@newsbf02.news.aol.com> <820988469.19749@pinetree.microserve.com> <4cs3ht$q0@mksrv1.dseg.ti.com> NNTP-Posting-Host: usr5ip27.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4cs3ht$q0@mksrv1.dseg.ti.com> bill.sorsby@dlep1.itg.ti.com (Bill S orsby) writes: >From: bill.sorsby@dlep1.itg.ti.com (Bill Sorsby) >Subject: Re: Question: RF Speech Processing >Date: 8 Jan 1996 21:49:49 GMT [snip] >I've still got a VOMAX which I used for years. In the tests I ran with it I >was never convinced that it accomplished nearly as much as was claimed for >it. I used it for whatever marginal benefit it might provide and because it >didn't distort my signal too badly (although some people complained!) As the designer of a unit similar to the VOMAX, I feel compelled to respond. The literature I have on VOMAX claims 10-12 dB improvement. One might ask what is meant by "improvement", to which I would respond, based on Schreuer's February 1971, Ham Radio Magazine article: intelligibility gain. OK, what does this mean, you ask. Good question. Difficult to answer. >The concept of speech compression is a fascinating subject. It is easy to >compress a signal so that the average power is increased, but improving >comprehension (the desired end result) is another matter; the two don't >necessarily go together. Well, it isn't easy to do it correctly:-) Increased average power and improved readability are not necessarily mutually exclusive though. I normally dislike anecdotal testimonials, but I don't know how to avoid them in this case, so a couple of personal examples. When I first tried my processor, I was using a 100W transceiver. I didn't own a linear amplifier, but I had the loan of one. I ran a number of on-the-air tests whereby I would ask the other op to compare signal strengths and intelligibility. I would first use the 100W with no processing. I would then turn on the amplifier (SB220) and get a report just to verify how much signal strength change he reported. I would then tell the other guy I was trying out this new audio filter design and I would like to know what he thought. I would turn on the processor and TURN OFF the amp and ask for a report. Almost invariably, the signal strength report was the same and the comments would be something like "The audio has more punch" or "You sound a little bassier" or "You're not quite so natural sounding", etc. I never got a report that suggested that I had dropped power by 10 dB. I serendipitously chanced upon another fellow, who was using my design, on one of those old ten meter paths where the signal is S1 but Q5. I asked him to turn off the processor so I could get a feel for how it sounded in the other direction. When he did, he was GONE. I mean gone. There was nothing. He had to turn it back on to tell me to go ahead. We did this several times in both directions with the same result. Again the disclaimer. I do mostly weak signal VHF work and I have no lab data to back this up, but I'm convinced, that a good processor, intelligently operated, is equivalent to adding a linear amplifier. > In some instances compression can be >counterproductive to comprehension or intelligibility. What happens is that >compression of mid-band speech frequencies (generally not critical to >comprehension) can drown out some of the higher speech frequencies (which are >critical to comprehension). I believe this to be one of the shortcomings with >the VOMAX and the reason why the on-air tests I ran never gave a decisive >advantage to the VOMAX. I'm not clear on what you mean by this. Advantage over what? There was one letter to Ham Radio Magazine from K3ND which discussed comparative tests between the VOMAX and my design. Gale reported a preference for my design in 90% of the cases. Most of his respondents believed that the VOMAX frequency response was too narrow. Perhaps this is the problem in your case. There is a trend to narrower and narrower filters in modern radios. Coupling these with further BW limiting in an outboard processor might cause problems. >I've never had the occasion to use RF processing (other than simple ALC) so I >can't provide a measure of comparison here. >For what it's worth. >Regards, >Bill Sorsby, N5BU 73, Wes -- N7WS From Unknown Tue Jan 09 18:27:50 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!warwick!news.herts.ac.uk!usenet From: Michael Petzold Newsgroups: rec.radio.amateur.homebrew Subject: Question: Neosid filters Date: 8 Jan 1996 18:01:34 GMT Organization: University of Hertfordshire Lines: 20 Message-ID: <4crm5u$171@helios.herts.ac.uk> NNTP-Posting-Host: 147.197.202.5 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Hi there! I've got a problem with so-called Neosid filters. I'm constructing at the time a weather satellite receiver, and I found a suitable description in "vhf communications", a British journal. Unfortunately it is a German development, so some country-specific components were seemingly used. In the schematic there are two different adjustable inductors (with core), and the author calls them Neosid filters. They have the notations 'BV 5056' and 'BV 5061', respectively. Does someone know where I can get those filters (?) in the *UK* ? Or, of like importance, does someone know what values these devices have in order to replace them? For suggestions or solutions, please e-mail to: M.Petzold@herts.ac.uk Thank you! From Unknown Tue Jan 09 18:27:51 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!newshost.convex.com!convex!tonyp From: tonyp@convex.com (Tony J. Podrasky) Newsgroups: rec.radio.amateur.homebrew Subject: Schematic of FQY Synthesizer Date: 8 Jan 1996 18:03:39 GMT Organization: CONVEX Computer Corporation, Richardson, TX USA Lines: 18 Message-ID: <4crm9r$kh8@convex.convex.com> NNTP-Posting-Host: convex1.convex.com GE I need to build a frequency synthesizer that has an output to 100Mhz. It seems to me that QST had one a year or two ago, but I give my old issues away so I'm not sure. Anyone know where I can get a schematic? 73, WA2EAA - tony -- The Coyote's | I'm the voice of all the Wildest West, the Patti of the Plain s; Song | I'm a wild Wagnerian opera of diabolic strains; Ernest Thompson| I'm a roaring, ranting orchestra with lunatics becrammed; Seton, 1913 | I'm a vocalized tornado - I'm the shrieking of the damned! From Unknown Tue Jan 09 18:27:52 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news.nic.surfnet.nl!tuegate.tue.nl!etprs!joopv From: joopv@etprs.seas.ucla.edu () Newsgroups: rec.radio.amateur.homebrew Subject: Re: Accurate Clock for Digital Circuits Date: 8 Jan 1996 18:44:49 GMT Organization: Eindhoven University of Technology, The Netherlands Lines: 20 Message-ID: <4cron1$1jl@tuegate.tue.nl> References: <4cjesa$j4s@linus.mitre.org> NNTP-Posting-Host: etprs.phys.tue.nl X-Newsreader: TIN [version 1.2 PL2] CARDS User (mhr@aol.com) wrote: > I am looking for a very accuarte clock (10 to 20 Mhz) to drive digital > circuits. The accuarcy should be roughly +/- 5 ppm at room temperatures. > If possible the circuit should be buildable with common electronic parts. > Please let me know if anyone has knowledge of an appropriate design. > Thanks to all in advance. > Mark R. Mark, There are TCXO's on the market (Temperature Compensated Crystal Oscillators) in a DIL-14 house. A simpeler solution is to solder a PTC disc to a crystal house. That way the xtal is stabilized at 60 degrees or so. Siemens has appropriate PTC disks for this purpose. Joop From Unknown Tue Jan 09 18:27:53 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: drted@ix.netcom.com(Ted Viens) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Bi-Directional Amplifiers Date: 8 Jan 1996 19:51:30 GMT Organization: Netcom Lines: 45 Message-ID: <4crsk2$h38@cloner3.netcom.com> References: NNTP-Posting-Host: ix-hou7-13.ix.netcom.com X-NETCOM-Date: Mon Jan 08 11:51:30 AM PST 1996 In Jack Mott writes: > >I have a question of the technical experts in this group, although the >subbject matter is slightly off-topic for this newsgroup. I have heard >that cable television systems will need bi-directional amplifiers in order >to support high-speed two-way communications by cable modems. Is this >correct? Also, how would one design a bi-directional amplifier over a >50-800 MHz frequency range (my guess as to what the cable spectrum is)? > >At higher microwave frequencies, I would design a bi-directional >amplifier using two conventional amplifiers tied together with >ferromagnetic circulators. However, this design approach really does not >work at lower frequencies (have you ever heard of a circulator covering >50 to 800 MHz?). > >If you post a response, please also send e-mail. > >Charles Mott > > > > It is not as complicated as some would imagine. The amplifiers are not truly hybrid bidirectional. A split system is used with diplexers at each side of the amplifiers. The most commom split is the sub split. 50-Max in the forward direction and 5-45 in the reverse direction. There are also two accepted standards in mid split systems. One is split at around 120 mHz and the other at around 250 mHz. These systems are mostly used in private campus situations where much of the bandwidth is used for telephony, networks and other forms of truly bidirectional communications. Currently, only about 10 percent of the cable systems in the US have return signals and those that don't are very reluctant to upgrade. The current Dog and Pony shows about widespread high speed interactive cable services are dancing on thin ice... -- Bye... Ted.. Deep in the Heart of the Armpits of Houston, Texas... From Unknown Tue Jan 09 18:27:54 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Antenna Tuner Kit-First Impressions Date: 8 Jan 1996 20:07:56 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 37 Sender: root@newsbf02.news.aol.com Message-ID: <4csf5c$b0o@newsbf02.news.aol.com> References: <1996Jan6.185503.8669@ohstpy> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <1996Jan6.185503.8669@ohstpy>, garland@ohstpy.mps.ohio-state.edu (JIM GARLAND) writes: >My only quibble with the kit is the printed circuit board. The board itself >is >of high quality. It is double-sided, with thru-plated holes, green >solder-masking, and silk-screened component outlines shown in white. My >concern >about the board is that the large majority of the traces seem to be extremely >thin. I couldn't measure them, but I'd guess a maximum width of 10 mil, and >probably less, perhaps even 6-7 mil. (all the relay control lines are wired >this way.) Further, the pad sizes seem too small >relative to the holes in the pad. I'm not an expert at PCB layout, but I'd >think that a pad should have a minimum of 10-15mil of metal around each hole. >The majority of holes on the board have significantly less metal than this. >In >fact, a majority of the holes were drilled slightly off-center in the pads, >so >that there is no metal at all on one side of the hole! > > Hi Jim, This sounds like the boards I get from out of house layout shops that never work with RF. That's too bad. Maybe you could point that out to the kit supplier, because your observations illustrate a big problem. Somewhere I heard the rhyme short and thick does the trick. I assume that meant RF traces. 73 Tom From Unknown Tue Jan 09 18:27:55 1996 Path: news.epix.net!news.sprintlink.net!service-2.agate.net!usenet From: John Wilcox/NS1Z Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Antenna Tuner Kit-First Impressions Date: 8 Jan 1996 21:14:37 GMT Organization: Agate Internet Services (AIS) Lines: 19 Message-ID: <4cs1fu$394@service-2.agate.net> References: <1996Jan6.185503.8669@ohstpy> NNTP-Posting-Host: ns1z.sdi.agate.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Well, I built the kit and was very happy with it. I had no problems with solder connections. The traces are fine (as in thin!) but seem to work for my setup. I run the tuner under my ICOM IC-706 in my old S-15 Jimmy and have had it in there for a few weeks now with not one problem. Time heals all wounds and, in the case of the tuner, may open some... I have had some correspondence with Dwayne and expect if a problem were to develeop I could count on him to provide any assistance possible. I would not only built another (if I needed it) but have heartily recommended it to my friends locally. It sure beats the old MFJs! -- John Wilcox / NS1Z INTERNET :204.117.6.48 ns1z@agate.net Work :5018901@mcimail.com TCP/IP :44.118.6.4 ns1z@ns1z.ampr.org AX-25 :ns1z@kb1bsc.fn44rn.me.usa.noam From Unknown Tue Jan 09 18:27:56 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!in2.uu.net!daver!UB.com!kaiwan.kaiwan.com!not-for-mail From: alf@kaiwan.com (Alfred Lee) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: Re: Using HP8690 with HP8410 Network Analyzer ??? Date: 8 Jan 1996 21:20:26 -0800 Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338) Lines: 21 Sender: alf@kaiwan009.kaiwan.com Message-ID: References: <4c1moh$a1d@nntp3.news.primenet.com> <4c22uj$mfg@nntp3.news.primenet.com> <820869685snz@microvst.demon.co.uk> NNTP-Posting-Host: kaiwan009.kaiwan.com Xref: news.epix.net rec.radio.amateur.homebrew:12602 rec.radio.amateur.equipment:23530 Sorry but I couldn't help. Enjoy. In article , Jay Wicklund wrote: > > Have you tried HP. I've purchased photocopies of old HP gear direct from ^^^^^^^^^^^^^^^^^^^^^^^^^^ Gee, I guess it will be real portable if you fold photocopy of 8620C and put it in your shirt pocket. > HP. It's not cheap, but it is reasonable. I don't have the number > handy, but if you have trouble finding it email me, and I'll look it up. > HP also has a web site that probably has phone numbers. > 73, --- Alfred Lee alf@kaiwan.co m KE6KGV 'The answer is (e^iã + 1) ? "No" : "Yes"' From Unknown Tue Jan 09 18:27:58 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Question: RF Speech Processing Message-ID: <1996Jan9.161003.15384@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <4cmp0n$2fb@newsbf02.news.aol.com> <820988469.19749@pinetree.microserve.com> <1996Jan7.200411.6084@ke4zv.atl.ga.us> Date: Tue, 9 Jan 1996 16:10:03 GMT Lines: 87 In article n7ws@azstarnet.com (Wes Stewart) w rites: >In article <1996Jan7.200411.6084@ke4zv.atl.ga.us> gary@ke4zv.atl.ga.us (Gary Coffman) writes: >>Ok, here's the problem. When you go to demodulate DSB back to >>audio, the output is the vector sum of *both* sidebands with the >>reintroduced carrier. You know what AM sounds like under selective >>fading, well the same thing is possible here if the clipping of >>the upper and lower sidebands isn't precisely symmetrical in both >>the amplitude and frequency domains. The latter is what's different >>about DSB. The sidebands are *mirror* images in the frequency domain, >>so the clipping also has to be mirror imaged in the frequency domain. >>That's not necessary with SSB. > >I have this crazy way of looking at things sometimes. I just said to myself, >"Self, if you *wanted* to clip each sideband in this DSB signal independently , >what is the likelyhood that you could do it with a simple clipping >circuit?" And I answered, "Beats me :-)" Well, I don't know of any deliberate simple controlled way to do it either, but what I'm talking about is unintentional and undesired behavior. In broadcast we call it incidental phase modulation, and it's the result of sending the signal through a somewhat non-linear system. The phase shift induced in the two sidebands is different, because they are on different frequencies, and varies with signal level. When they recombine in the demodulator, their vector sum is different from the input signal too. Through a system that deliberately operates non-linearly, the effect should be much greater. >>Depending on how the clipper is implemented, there can be considerable >>differences induced in the phase/amplitude envelopes of one sideband and >>its mirror image. Those differences will show up as in-band distortion >>products. I don't have a feel for how great a problem this may be, but >>I'm sure it is a problem (it is for AM broadcast transmitters using >>compression), and there's no way to simply filter out these components. >>My gut feel is that it's important to use a carrier as high in frequency >>as possible for modulating and demodulating the DSB signal so that >>the percentage bandwidth is minimized and possible asymmetries in >>the frequency domain are reduced. >>Another potential problem is reciprocal mixing in the demodulator. >>The clipped sidebands will generate a *pair* of harmonics for each >>audio generated product. To take the steady state example you pose, >>the LSB will have a harmonic at 11.998 MHz while the USB will have >>a harmonic at 12.002 MHz. Those two can *also* mix in the demodulator >>yielding a difference product of 4 kHz which will be in the output >>audio passband. Now that particular product is high enough to be >>audio filtered in the output, but consider if there is a 500 Hz >>component present in the input audio, its product will fall on >>2 kHz in the output, and that's in the speech band. The obvious >>solution to this problem is a lowpass filter between the clipper >>and the demodulator. But that lowpass filter has to be pretty >>good to eliminate sensible products in the output. The lowpass >>in a SSB clipper doesn't have to be quite as good since it doesn't >>have to deal with paired products, IE there are only half as many >>potential mixing products that can fall in the speech bandwidth >>of the output with SSB *and* they are unrelated in phase, so >>there's a potential for at least 6 db worse distortion products >>out of a DSB clipper than a SSB clipper. > >I think it's too late to use a low-pass after the clipper. The intermod >products can (will) be generated in the clipper. After all, it's a >highly non-linear device, perfectly suited for mixing. For example: > >Two audio tones, 500 and 1000 Hz applied to the balanced mixer along with >a 6 MHz carrier. Output is 6 MHz (suppressed), 5.999, 5.9995, 6.0005 and >6.001 MHz. Assume an USB filter. Output is now 6.0005 and 6.001 MHz. >Clip the hell out of it and get 6.0005, 6.001, 12.001, 12.002, 18.0015, >18.003... Also, get (12.002-6.0005 = 6.0015) and (18.003-12.001 = 6.002) >which both fall in the passband of the following LPF and BPF. It might be >argued that if the clipping is perfectly symmetrical, there won't be a 12.001 >and 12.002, but (18.0015-6.0005 = 12.001) and (18.003-6.001 = 12.002) so ther e >they are. The split-band approach doesn't suffer this particular problem. I agree with this, of course, but I think this high order multiple mix will be of considerably lower amplitude than the straight products the filter would remove. You'd need some sort of circulating tank to keep the base products around to remix with each other to form tertiary products sensible to the demodulator. I don't think most clipper circuits have enough tank to do that to any significant degree, but perhaps the very filter I'm suggesting might supply that tank. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Jan 12 14:12:23 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 900 MHz Security Date: 5 Jan 1996 19:43:32 GMT Organization: SunSoft South, Los Angeles, CA Lines: 24 Message-ID: <4cjv14$naq@abyss.West.Sun.COM> References: NNTP-Posting-Host: sunspot.west.sun.com In article , Jack Mott wrote: >This posting is off-subject for this newsgroup, but I wanted access to >the technical knowledge available here. I have a 900 MHz digital >cordless phone (ATT 9100), and I am interested in how secure this type of >phone is with respect to over-the-air eavesdropping. Please give a >specific, technical answer addressing issues such as RF modulation and >digital encoding. If you post a response, please also send e-mail. The ATT 9100 uses wideband FM, modulated with the CVSD data produced by a Motorola MC3418. I suppose someone could build a receiver or tweak another 9100 to eavesdrop, but, as far as I can tell, this is impractical enough to be of little concern. Certainly it is much more secure than a conventional analog FM phone, and even much more secure than a frequency-inversion scrambled phone. It isn't encrypted, but I would say it is essentially secure. I'm not a security expert, though ;-) -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Fri Jan 12 14:12:25 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!mr.net!news.mr.net!inet-serv.com!n0jcf.com!not-for-mail From: chrise@n0jcf.com (Chris Elmquist) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 900 MHz Security Date: 11 Jan 1996 13:31:34 -0600 Organization: The Basement of N0JCF Lines: 52 Message-ID: <4d3oim$tse@n0jcf.com> References: <4cjv14$naq@abyss.West.Sun.COM> NNTP-Posting-Host: n0jcf.com In article <4cjv14$naq@abyss.West.Sun.COM>, Dana Myers wrote: >In article , >Jack Mott wrote: >>This posting is off-subject for this newsgroup, but I wanted access to >>the technical knowledge available here. I have a 900 MHz digital >>cordless phone (ATT 9100), and I am interested in how secure this type of >>phone is with respect to over-the-air eavesdropping. Please give a >>specific, technical answer addressing issues such as RF modulation and >>digital encoding. If you post a response, please also send e-mail. > >The ATT 9100 uses wideband FM, modulated with the CVSD data produced >by a Motorola MC3418. I suppose someone could build a receiver >or tweak another 9100 to eavesdrop, but, as far as I can tell, this >is impractical enough to be of little concern. > >Certainly it is much more secure than a conventional analog FM >phone, and even much more secure than a frequency-inversion >scrambled phone. It isn't encrypted, but I would say it is >essentially secure. I'm not a security expert, though ;-) > However-- my Tropez 900DL (of which the ATT9100 is a clone) transmits a fairly powerful "image" in the clear on roughly 435 MHz. I discovered this about a year ago and made a posting or two about it. I even contacted Tropez and had a dialog going with someone (a ham even) in their engineering group. He promised to look into it and get back to me... well, surprise... no response. I probably could start pestering again but currently it's not bothering me too much. I'm down on 432 where I don't hear it. OSCAR ops would be another story. I first noticed it as a periodic chirp... and was annoyed enough to strap the R7000 onto my belt :-) and go sniffing around the house looking for it. It was hottest right at the handset... and went away if the handset was placed into the base. Turns out the periodic chirp is the handset pinging the base checking signal integrity or whatever. So, whenever the handset was off the base... like, sitting on the coffee table... it was making bad noises on 435 MHz. I then placed a call with the Tropez and tuned around where the chirps where heard on 435... sure enough-- I could hear both the incoming and outgoing telephone audio (somewhat garbled but still easy to copy) in the clear. Not sure if every unit does it-- but a friend checked his and found the same behavior. Your mileage may vary. Chris -- Chris Elmquist, N0JCF chrise@n0jcf.com n0jcf@amsat.org From lwbyppp@epix.net Fri Jan 12 14:12:26 1996 Path: news.epix.net!news.sprintlink.net!bristlecone.together.net!sequoia!fflynn From: fflynn@together.net (Francis Flynn) Newsgroups: rec.radio.amateur.homebrew Subject: Amidon? Date: 11 Jan 1996 15:53:39 GMT Organization: TGF Internet Services Lines: 13 Message-ID: <4d3bq3$8bm@bristlecone.together.net> NNTP-Posting-Host: sequoia.together.net X-Newsreader: TIN [version 1.2 PL2] Does anyone have a current address and phone number for Amidon Associates? The phone number I have is 213 763 5770, it's disconnnected. Directory assistance was no help either. If they are gone, does anyone have a good source of toroids? TIA 72/73 -- http://together.net/~fflynn Francis Flynn, fflynn@together.net ARS:KM1Z From lwbyppp@epix.net Fri Jan 12 14:12:27 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!zippy.intcom.net!imci3!imci2!newsfeed.internetmci.com!in2.uu.net!nntp.news.primenet.com!news.primenet.com!ip201.msp.primenet.com!user From: gregp@primenet.com (Greg Putrich) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Amidon? Date: 11 Jan 1996 17:56:01 -0700 Organization: Primenet Services for the Internet Lines: 27 Sender: root@primenet.com Message-ID: References: <4d3bq3$8bm@bristlecone.together.net> X-Posted-By: ip201.msp.primenet.com In article <4d3bq3$8bm@bristlecone.together.net>, fflynn@together.net (Francis Flynn) wrote: > Does anyone have a current address and phone number for Amidon Associates? > > The phone number I have is 213 763 5770, it's disconnnected. Directory > assistance was no help either. > > If they are gone, does anyone have a good source of toroids? > > TIA 72/73 > > -- > http://together.net/~fflynn > Francis Flynn, fflynn@together.net > ARS:KM1Z Try: PO Box 25867 Santa Ana, CA 92799 714-850-4660 ------------------------------------------------------------------ Greg Putrich / gregp@primenet.com [II] PGP-Key 27E97EBD = 62 0E B9 A2 45 D2 64 AC 8A B4 6D 9D 5B 23 90 1F So little to do, so much time. From lwbyppp@epix.net Fri Jan 12 14:12:28 1996 Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.netzone.com!usenet From: "Brian C. Dolan" Newsgroups: rec.radio.amateur.homebrew Subject: BFO Project Questions ????? Date: 11 Jan 1996 02:13:18 GMT Organization: NetZone, Inc. (602) 991-4NET Lines: 41 Message-ID: <4d1rnv$81i@news1.netzone.com> NNTP-Posting-Host: p9.netwest.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) I recently downloaded a small schematic for a BFO synthesizer add-on for SW receivers, that I found on a QRP related site. Within the brief text associated with the schematic, it states: "The heart of this project is a 455 kHz IF transformer: go to your closest junked broadcast radio receiver and steal one from there." Not knowing what a "455 kHz IF transformer" is, and being an inquisitive guy, I pried open the nearest cheapo AM radio and found some things I recognized, and some I didn't. Process of elimination led me to rule out the resistors, capacitors, coils (chokes?) and transistors. This left the metal "cubes" (7 in this case),each with a hole in the top. In the hole is something with a flatbladed screwdriver slot in it. Is this an IF transformer? If it is, can someone briefly explain what it does? Additionally, each one has a different color in it; what does the color signify? (...maybe the 455 kHz aspect ???) Later in the text, it states: "Adjust the transformer slug until it resonates at 455 kHz, which can be accomplished using a receiver or GDO. AS you tune the slug (using the receiver) you should hear the heterodyne note of the BFO lowering in pitch until it eventually zero- beats." This section left me scrathing my head. I assume it has something to do with those screwdriver slots, but I have no idea what it's trying to get me to do. How would I use a receiver to do this? What is a GDO? What is "zero-beats"? Answers to the above questions, as well as any general advice would be greatly appreciated. Thanks in advance for helping a new ham, Brian KC7JRT From lwbyppp@epix.net Fri Jan 12 14:12:30 1996 From: Dave_Covert@msn.com (David Covert) Subject: DC/AC (Inverter) Schematic? Date: 11 Jan 96 17:36:36 -0800 Message-ID: <00001fee+0000123e@msn.com> Path: news.epix.net!news.sprintlink.net!news.msn.com!msn.com Newsgroups: rec.radio.amateur.homebrew Organization: The Microsoft Network (msn.com) Lines: 14 I am looking for schematics for a high amp DC/AC converter to use in the field. It should take 12VDC in and produce 120VAC 60Hz out at 1600 watts. I realize the best way to do this is to have a design with a single 'signal' card and multiple 'driver' cards. Each 'driver' card could procude 100W and take it's 60Hz from a common source. Anybody have an expandable design like this? Dave Covert, KB5GOG From lwbyppp@epix.net Fri Jan 12 14:12:31 1996 Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!calweb!calweb!usenet From: billj@calweb.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: DC/AC (Inverter) Schematic? Date: 12 Jan 1996 00:10:45 GMT Organization: CalWeb Internet Services, Inc. Lines: 7 Message-ID: <4d48u5$elv@news.calweb.com> References: <00001fee+0000123e@msn.com> NNTP-Posting-Host: sac2-67.calweb.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) Dave I beleive the way its done these days is to us an DC to AC converter operating at a frequency such as 50 KHz. Convert this to DC and then switch the DC to generate the AC at the desired frequency. This uses smaller transformers that going directly to 60 Hz or whatever. Bill K7NOM From lwbyppp@epix.net Fri Jan 12 14:12:32 1996 Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Zack Lau Newsgroups: rec.radio.amateur.homebrew Subject: Re: Design for a 1W PA for 1296MHz Date: Thu, 11 Jan 1996 12:26:41 -0800 Organization: American Radio Relay League Lines: 20 Message-ID: <30F57281.7A59@arrl.org> References: <4cg887$15f@hawk.pix.za> NNTP-Posting-Host: zlau.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win16; I) Danie Brynard wrote: > I am looking for a design or references to a design for a PA of > about 1W for my 1296MHz transverter. Tough power level. Cheap plastic case devices only seem to do 500 to 600 mW output. Most people seem to settle for that and run this into a surplus GaAs FET or expensive hybrid module to get 4 to 10 watts output. The 1995 Microwave Update Proceedings (ARRL #5366) has a +28 dBm design by AA5C using the Siemans CLY-5. Many GaAs FETs will work just fine lower in frequency, but the impedance matched ones never seem to tune up the same way. No problem for the "real experimenter," make sufficiently long 50 ohm input/output lines and tune till it works! Of course, the M67715 hybrid will easily put out a watt linear, but I don't think this is what you want. Zack KH6CP/1 From lwbyppp@epix.net Fri Jan 12 14:12:33 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.dfn.de!Germany.EU.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Funky bias setup in VHF linear amps? Date: 9 Jan 1996 06:47:05 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 24 Sender: root@newsbf02.news.aol.com Message-ID: <4ctkjp$pop@newsbf02.news.aol.com> References: NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Jim, In article , jdc@cci.com (James D. Cronin) writes: >The schematic for a Mirage 2-meter linear amp shows a bias arrangement >that looks peculiar. >There is the usual rectifier diode from transistor base to ground >with a fixed resistor and trimmer potentiometer in parallel. This part >looks normal. >What was odd was the bias supply: Instead of being fed by a DC voltage >it was connected to the transistors collector through (here's the wierd >part) a series resistor, capacitor and choke. Don't depend on the schematic to be absolutely correct. What Mirage amp is it? I'll look at one and tell you how the circuit works. 73 Tom > >How is this supposed to work? Are they siphoning off some of the output >signal and letting the parallel diode rectify it? > >73..Jim N2VNO From lwbyppp@epix.net Fri Jan 12 14:12:34 1996 Date: 10 Jan 1996 16:53:38 EDT Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!istar.net!infoshare!whome!gts!feline!humnet.humberc.on.ca!hduff Newsgroups: rec.radio.amateur.homebrew From: hduff@humnet.humberc.on.ca (Hugh Duff) Message-ID: <8213108211903@lss.humnet.humberc.on.ca> Organization: HumberNet LSS, Humber College, Canada References: <1996Jan8.145012.9602@ke4zv.atl.ga.us> Subject: Re: Ham Gods and Spectrum Analyzers (Was interesti Lines: 22 > In article <4coc5i$kpq@newsbf02.news.aol.com> lrware@aol.com (Lrware) writes : >>Bravo! Do we have an ex spectrum analyzer designer among us? > > No, just a spectrum analyzer user, and sometimes repairman. > > Gary > > Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Gary...Just wondering if you are getting your e-mail ? I sent you 2 messages within the past few weeks. Zack Lau tells me that you were messing with a 222 MHz TX strip design. I'm working on something similar...wondering if you care to share info ? Thanks..Hugh Duff VA3TO Toronto --- þ NFX v1.3 [000] From lwbyppp@epix.net Fri Jan 12 14:12:35 1996 Path: news.epix.net!news.sprintlink.net!uunet!in2.uu.net!newsfeed.internetmci.com!info.ucla.edu!unixg.ubc.ca!rover.ucs.ualberta.ca!cancer From: garyb@psych.ualberta.ca (Gary Burchett) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help with MC68HC705C8 Programming Date: Tue, 09 Jan 96 16:56:31 GMT Organization: University of Alberta Lines: 31 Message-ID: <4cu2oa$frc@pulp.ucs.ualberta.ca> References: NNTP-Posting-Host: cancer.psych.ualberta.ca X-Newsreader: News Xpress Version 1.0 Beta #4 In article , rlong@magnus.acs.ohio-state.edu (Ron Long) wrote: >Hello, > >I want to program a OTP (one time programmable) Motorola >microcontroller MC68HC705C8 using a circuit given in the >Motorola manual which transfers data from a 2764 eprom into >the controller. > >The question is the data book is unclear about the programming >voltage (Vpp). At one place it says 16 V maximum but it never gives >a typical or 'correct' voltage? 12 Vdc? Is 13.8 Vdc ok? > >Thanks for any help. > >Ron, w8gus. You are right, I could not find that spec in the data book, either. However, another source is the Technical Documentation, available on the Web at http://design-net.com/csic/Tech_data.html , one of Motorola's many resources. You have to register, which is not much of a chore. The documents are in PDF format, so you need to get the Acrobat reader from the Adobe site. There is a link at Motorola. Make sure you get version 2.1 . The spec you need is : @Vdd = 5 volts and Vss = 0 volts, Vpp = 14.5 volts min. , 14.75 volts typ. , and 15.0 volts max. Thes figures are from the electrical specifications section. The document is also much more descriptive of the various features of the processor. Regards, Gary VE6BBD From lwbyppp@epix.net Fri Jan 12 14:12:36 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Help With MOV's Message-ID: <1996Jan10.154150.19780@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4coesd$mg7@newsbf02.news.aol.com> Date: Wed, 10 Jan 1996 15:41:50 GMT Lines: 29 In article <4coesd$mg7@newsbf02.news.aol.com> w8jitom@aol.com (W8JI Tom) writ es: >I wonder if anyone looked at the voltage a MOV requires before the >resistance really drops a lot, and compared that to the current the device >you are protecting would be drawing at the same voltage. It's been a while >since I looked at them, but when I did they almost were worthless for >power line protection. Typically a MOV will be in hard conduction at 150% to 200% of its rated working voltage, IE for a V130 that would be 195 to 260 volts. It'll reach hard conduction a few nanoseconds after a transient reaches that value, and remain so until the transient decays (up to the peak joule rating of the device). Now assuming the PS being protected has a dV/dt longer than a few nanoseconds, the transient will be safely clamped before damaging voltage can pass through. Remember a MOV isn't intended to be an overvoltage protector, it's a *transient* surge protector. It won't protect a PS if the line voltage rises to 140 volts for a sustained time, but it will keep transient peaks below values that could punch a junction or an electrolytic cap in the supply. (It is assumed that a good PS design will use parts rated for peaks at least 150% to 200% of their planned sustained voltage.) Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Jan 12 14:12:37 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: 12 Jan 1996 05:26:28 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 43 Sender: root@newsbf02.news.aol.com Message-ID: <4d5d0k$8vm@newsbf02.news.aol.com> References: NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Gary, You wrote: >Typically a MOV will be in hard conduction at 150% to 200% of its >rated working voltage, IE for a V130 that would be 195 to 260 volts. >It'll reach hard conduction a few nanoseconds after a transient reaches >that value, and remain so until the transient decays (up to the peak> >joule rating of the device). Could you please give me an example of what the "hard conduction" resistance is? What is the "on" resistance at say...300 volts peak for a MOV that will safely opeate on a normal 120 volt power line (say 180 volt peaks). Do you have the exact specs? The last time I looked at the data from manufacturers of MOV's, they were about worthless! Transformers would have been into saturation way before the MOV conducted, and the transformer's saturated impedance would have been several times lower than even a very large MOV's "on" resistance. Maybe that has changed in the past few years. Do you have data that indicates a MOV that can protect a transformer operated supply? I understand MOV's help on line operated devices without a transformer (they are better than nothing), but what about if a transforer is used? 73 Tom Now assuming the PS being protected has a dV/dt longer than a few nanoseconds, the transient will be safely clamped before damaging voltage can pass through. Remember a MOV isn't intended to be an overvoltage protector, it's a *transient* surge protector. It won't protect a PS if the line voltage rises to 140 volts for a sustained time, but it will keep transient peaks below values that could punch a junction or an electrolytic cap in the supply. (It is assumed that a good PS design will use parts rated for peaks at least 150% to 200% of their planned sustained voltage.) Gary -- From lwbyppp@epix.net Fri Jan 12 14:12:38 1996 Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!news.bc.net!news.uoregon.edu!psgrain!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!newspeak.ultratech.net!worldlinx.com!news.worldlinx.com!news From: evincent@mediom.qc.ca (Eric Vincent) Newsgroups: rec.radio.amateur.homebrew Subject: How make a (T/R Swich) ??? Date: 10 Jan 1996 04:53:49 GMT Organization: Personnel Lines: 7 Message-ID: <4cvgot$8p6@news.worldlinx.com> NNTP-Posting-Host: 204.101.89.39 Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 I have a TH-78A, I want to drive a T/R Swich with my radio and I don't have any idea to make that. Please help me!!! Thanks, Eric VE2-VXT (evincent@mediom.qc.ca) From lwbyppp@epix.net Fri Jan 12 14:12:39 1996 From: Glenn.Schultz@f100.n282.z1.fidonet.org (Glenn Schultz) Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.corpcomm.net!news.uoregon.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!newsfeed.internetmci.com!mr.net!news.mr.net!medtronic.com!rosevax!hamlink!fredmail Newsgroups: rec.radio.amateur.homebrew Subject: Re: Kenwood on internet? Message-ID: <821225582.AA04923@hamlink.mn.org> Date: Tue, 09 Jan 1996 20:35:45 -0100 X-FTN-To: Cybercop@com18.com Lines: 6 Try their dial-up BBS at: 1-310-761-8284 Good Luck! Glenn n0vyk@n0vyk.ampr.org [44.94.248.210] From lwbyppp@epix.net Fri Jan 12 14:12:40 1996 Path: news.epix.net!uunet!in2.uu.net!in-news.erinet.com!bug.rahul.net!a2i!sierra.net!squaw-d121.sierra.net!user From: rst@tetrault.com (Bob T.) Newsgroups: rec.radio.amateur.homebrew Subject: Low Noise Linear Power Supplies Date: Wed, 03 Jan 1996 13:56:49 -0800 Organization: Engineered Solutions Lines: 22 Message-ID: NNTP-Posting-Host: squaw-d121.sierra.net Recent postings about the 723 et al looking for low noise regulators, prompted me to go back into the databooks. Looking at the National specs for the LM723, while RMS noise is specified, it is only spec'd as typical, with no maximum. The Motorola databook for their TL431 claims low noise, and even gives a Noise Spectral Density graph, but nowhere do they actually specify even the typical noise characteristics, much less the max values. On the other hand, the National LM369 series of precision references is fully spec'd and guaranteed 30 microVolts RMS maximum, typically 10 microVolts, unfiltered. Adding a .1uF film cap brings it down to 4 microVolts, and more is better, up to 1uF. Also, the LM369 has ppm stability for line, load and tempco. Unless there is hard data that no 723 exceeds their typical noise spec, ever, my money will continue to go with the LM369, though it is more expensive and dictates a discrete design to the regulator, for low current demand oscillators, a 30 milliampere buffer is a trivial exercise... Bob T From lwbyppp@epix.net Fri Jan 12 14:12:41 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Zack Lau Newsgroups: rec.radio.amateur.homebrew Subject: Re: Low Noise Linear Power Supplies Date: Wed, 10 Jan 1996 17:02:04 -0800 Organization: American Radio Relay League Lines: 10 Message-ID: <30F4618C.2E3B@arrl.org> References: <4cf4hd$lrb@abyss.West.Sun.COM> NNTP-Posting-Host: zlau.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win16; I) To: Dana Myers Dana Myers wrote: > Is the LM723 spec taken using the integral pass transistor? As I understand the specs, they refer to Fig 1 on page 1-185 of the Power IC's Databook. Presumably, a load is attached to draw 1 mA from a 5 volt regulator running off 12 volts. Thus, the answer appears to be "yes." Zack KH6CP/1 zlau@arrl.org From lwbyppp@epix.net Fri Jan 12 14:12:42 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!news.uoregon.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: John&Suzie_Rollins@pmug.ORG (John&Suzie Rollins) Newsgroups: rec.radio.amateur.homebrew Subject: Mailing list in Digest format vs. ??? Date: 10 Jan 96 22:32:14 GMT Organization: Portland Mac Users Group Lines: 5 Message-ID: <607453150.59331179@pmug.org> Reply-To: John&Suzie_Rollins@pmug.org NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I am currently recieving this mailing list in digest format, and I was wondering how to change it to normal eMail, as I find the messages difficult to read when in gigest form. TIA and 73 -JR From lwbyppp@epix.net Fri Jan 12 14:12:43 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!news.mathworks.com!zombie.ncsc.mil!nntp.coast.net!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MC1496/1596 obsolete ? Date: 4 Jan 1996 19:00:29 GMT Organization: SunSoft South, Los Angeles, CA Lines: 13 Message-ID: <4ch84d$5ie@abyss.West.Sun.COM> References: <137cc$16c20.255@news.ak.net> NNTP-Posting-Host: sunspot.west.sun.com Xref: news.epix.net sci.electronics.components:1107 rec.radio.amateur.homebrew:12608 In article <137cc$16c20.255@news.ak.net>, Hello wrote: >Hello, > >Is there a remplacement for this chips ? The NE602 is very popular, with an on-board oscillator that can be bypassed. -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Fri Jan 12 14:12:44 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!howland.reston.ans.net!usc!sdd.hp.com!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!hpuerci.atl.hp.com!news From: Rahul Patel Newsgroups: rec.radio.amateur.homebrew Subject: Need Mod for KENWOOD TR-7850 Date: 10 Jan 1996 20:10:00 GMT Organization: HEWLETT-PACKARD CO. Lines: 6 Distribution: world Message-ID: <4d16eo$lu5@hpuerci.atl.hp.com> NNTP-Posting-Host: f3142rhp.ssr.hp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) I know this a older Kenwood 2m radio. I would like to get all/any modification that anyone has come across for the radio. Thanks a lot in advance. 73, Rahul Patel - N4RWZ From lwbyppp@epix.net Fri Jan 12 14:12:45 1996 Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news From: "Thomas C. J. Sefranek" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Pinout 4CX250K (coaxial base) Date: 10 Jan 1996 00:48:25 GMT Organization: SRC Lines: 13 Message-ID: <4cv2dc$a14@news.iii.net> References: <4ctd2m$m76@newsbf02.news.aol.com> NNTP-Posting-Host: wa1rhp.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: tantonr@aol.com Hey! You actually have an amplifier that uses the 4CX250Rs??? I have about 50 of the tubes still in the sealed cans. I have the varian spec sheet for the tubes too. What freq. range was the amplifier built for? Tom WA1RHP From lwbyppp@epix.net Fri Jan 12 14:12:46 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.datasync.com!news From: "G.D.Fender" Newsgroups: rec.radio.amateur.homebrew Subject: Need voltages for Heathkit HA-14 Linear Date: 9 Jan 1996 18:52:26 GMT Organization: Eureka Labs Lines: 10 Message-ID: <4cudha$rvj@osh2.datasync.com> NNTP-Posting-Host: os-ppp8.datasync.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Does anyone know the voltages needed for the Heathkit HA-14 linear amp? I particularily need the bias voltage... Please send e-mail to eureka@datasync.com Thanks es 73, Gary - W6SZX From lwbyppp@epix.net Fri Jan 12 14:12:46 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!atlantis.utmb.edu!news.tamu.edu!news.utdallas.edu!news01.aud.alcatel.com!gatech!udel!faatcrl.faa.gov!faatcrl.faa.gov!usenet From: "Paul D. Seyler" Newsgroups: rec.radio.amateur.homebrew Subject: NiCAD Charger Schematic? Date: Wed, 10 Jan 1996 09:51:47 -0800 Organization: Federal Aviation Administration Lines: 2 Message-ID: <30F3FCB3.2EA8@admin.tc.faa.gov> NNTP-Posting-Host: 155.178.52.141 X-Mailer: Mozilla 2.0b3 (Win16; I) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Has anyone built or designed a peak detector type NiCad battery charger? If so, are the schematics (or construction acticle) available? From lwbyppp@epix.net Fri Jan 12 14:12:48 1996 Path: news.epix.net!news.sprintlink.net!news.inc.net!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!usc!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NiCAD Charger Schematic? Date: 10 Jan 1996 20:19:48 GMT Organization: Hewlett Packard Corvallis Site Lines: 18 Message-ID: <4d1714$grd@hpcvsnz.cv.hp.com> References: <30F3FCB3.2EA8@admin.tc.faa.gov> NNTP-Posting-Host: hplsnb.lsid.hp.com Paul D. Seyler (Paul_Seyler_at_AOS500@admin.tc.faa.gov) wrote: : Has anyone built or designed a peak detector type NiCad battery charger? : If so, are the schematics (or construction acticle) available? There are several manufacturers of ICs that do most of the job. For example, if you just follow the circuits in the Maxim data sheet for the MAX712/713, you can build a "universal" charger that you switch the number of cells on, or a "custom" charger for a fixed battery size. They show both switching and linear types of circuits; the linear is far simpler and I'd say to go with that unless you really need the power efficiency. DigiKey lists these parts at just over $6 each. I couldn't say if the Maxim parts are the "best", but they should be available and seem to do a reasonable job. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Fri Jan 12 14:12:48 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!paperboy.osf.org!bone.think.com!blanket.mitre.org!agate!howland.reston.ans.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: OLD 20M HB SSB/CW XCVR - early 60s? Date: Tue, 09 Jan 96 18:45:50 GMT Lines: 21 Message-ID: <821256923.24518@pinetree.microserve.com> References: NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 dgf@netcom.com (David Feldman) wrote: >Somewhere in the 1960s (I believe) there was published a design >article for construction of a SSB transceiver. It was all solid >state, was intended for 20 meters, was about 1/4 watt output power, >and specifically was designed to run from a 6 (not 12) volt power >supply. It was about the size of a cigar box as I recall, . . . The article was titled "A Solid-Statte S.S.B. Transceiver" and the author was Benjamin H. Vester, W3TLN. The circuit design uses a combination of PNP and NPN bipolar transistors and an 8.55 MHz IF constructed around a homebrew crystal filter. I don't have the original QST this appeared in, but the article was reprinted in the 1970 edition of "Single Sideband for the Radio Amateur". E-mail your address and I'll send a photocopy. 73, Jack WB3U jackl@pinetree.microserve.com From lwbyppp@epix.net Fri Jan 12 14:12:49 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Antenna Tuner Kit-First Impressions Date: 10 Jan 1996 09:25:59 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 22 Sender: root@newsbf02.news.aol.com Message-ID: <4d0i9n$t2j@newsbf02.news.aol.com> References: <4cs1fu$394@service-2.agate.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4cs1fu$394@service-2.agate.net>, John Wilcox/NS1Z writes: > >Well, I built the kit and was very happy with it. I had no problems with >solder connections. The traces are fine (as in thin!) but seem to work >for my setup. I run the tuner under my ICOM IC-706 in my old S-15 Jimmy >and have had it in there for a few weeks now with not one problem. Time >heals all wounds and, in the case of the tuner, may open some... I have >had some correspondence with Dwayne and expect if a problem were to >develeop I could count on him to provide any assistance possible. I would >not only built another (if I needed it) but have heartily recommended it >to my friends locally. It sure beats the old MFJs! >-- >John Wilcox / NS1Z Hi John, Can you tell us how the software does it's thing? I'm curious about that. 73 Tom From lwbyppp@epix.net Fri Jan 12 14:12:51 1996 Path: news.epix.net!news.sprintlink.net!news.netnet.net!news.inc.net!news.uoregon.edu!cs.uoregon.edu!usenet.ee.pdx.edu!newsrelay.netins.net!solaris.cc.vt.edu!newsfeed.internetmci.com!netnews.nwnet.net!news.ohsu.edu!usenet From: "BICC Info. Center" Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: 9 Jan 1996 01:27:37 GMT Organization: OHSU Lines: 12 Message-ID: <4csga9$lrk@fremont.ohsu.edu> References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <1996Jan5.154927.25538@ke4zv.atl.ga.us> <30ed97c4.2898071@news.agt.net> NNTP-Posting-Host: 137.53.22.101 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) I have read all of the above mentioned comments and I agree with the just of what is being said. What I am wondering is does the tuner work as billed or would I be better of buying a AT-50 for my IC-706 I see one person had had good luck with this combo does anyone else have more to say ??? You can Email me at ashleyb@ohsu.edu if possible or just post it. Thanks Brad WB7TSO From lwbyppp@epix.net Fri Jan 12 14:12:53 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Ed Hare Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: 10 Jan 1996 21:56:13 GMT Organization: American Radio Relay League, Inc. Lines: 61 Message-ID: <4d1clt$c1q@mgate.arrl.org> References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> NNTP-Posting-Host: ehare.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) Mike Queally wrote: >I also don't understand why QST would publish an article for >a project that you can not get a part for from somewhere other then >the author at a high price. what if I already have a chip and the >ability to program it. I do not care to see the source code. If he >could have provided a binary file to download from arrl BBS at least >then I can program the chip myself. I would not characterize the charge for the chip as "high price" -- the author offered it with a socket for $20.00 -- perhaps a few dollars at most over the unprogrammed device cost. Don't get me wrong; I agree with those who are telling us all that a construction article is more valuable to the reader if it has source code. I agree with the relative few who will scrounge all the parts and program their own microprocessor that an article that is essentially a technical description of a kit is less valuable than one that is more complete. When the author offered the block diagram, I think we erred in not making the block diagram available somehow. I agree with those who feel that as a matter of principle QST should publish articles that are educational. I have to wonder, however, whether that principle should not be flexible. I have heard from a number of folks who are glad we ran the article, because even with its lack-of-full-information flaws, it was a useful article. Would it really be right for us to see a really neat construction-project article and decide that we were not going to share it with anyone because a relative handful of people who want to program their own IC think that we should not? For old construction pros like you and I, it is a big deal to program our own IC; for many of the newcomers, it is a big deal to pick up a soldering iron and build anything useful at all. Perhaps we can say that this article was written for them, and if we feel an aritcle is not useful because it is missing something, turn the page and move on to the next. I have been somewhat surprised to see some of the turns this thread has taken. I have seen a few posts that seem to imply that because QST *occasionally* has run an article that doesn't offer source code, that *none* of our articles are complete. In reality, over the past three years, QST has, if memory serves, offered two articles that didn't include source code. FWIW, those two have proved to be among the most popular construction projects, based on the semi-formal counts we always get from the authors. I think that tells me that we have chosen the exceptions to our informal "rules" wisely. (We *do* encourage all authors to make source code available, and will continue to do so. We have even changed a few minds along the way.) All in all, I think QST offers a good balance of articles, ranging from some higher-tech articles, lots of articles for the middle ground and a substantial section of articles that are chosen because they would interest newcomers. (Now, for me, the DXCC and contest results hold little interest, but I just assume they are there for someone else and let it go at that.) I would join the howls of protest if all of our articles became the "buy the kit" articles, but really don't mind seeing the occasional gem that is like the auto-tuner-kit article. 73 from ARRL HQ, Ed Hare, KA1CV, ARRL Laboratory Supervisor From lwbyppp@epix.net Fri Jan 12 14:12:54 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!nntp-hub2.barrnet.net!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Tuner article Date: 9 Jan 1996 01:55:23 GMT Organization: SunSoft South, Los Angeles, CA Lines: 29 Message-ID: <4cshub$k98@abyss.West.Sun.COM> References: <9600058208.AA820863233@mails.imed.com> NNTP-Posting-Host: sunspot.west.sun.com In article <9600058208.AA820863233@mails.imed.com>, wrote: >I foolishly posted several opinions on this subject over on qrp-l (or >was it boat anchors?) just before the holidays. I had only scanned >the article with the Christmas rush coming. > >Many of the posts criticizing the authors and QST have lamented not >being able to take the article and produce a project ranging from >totally built from scrounged parts to bought the kit from the authors >and put it together. I find that this article allows exactly this >range! My criticism, which I don't think I've tossed into this particular iteration of the "no source code available" discussion, is a little different. Just as any construction article contains a schematic of the hardware components, the source code is analgous to a schematic of the software components. Seeing the details of both can be quite educational; seeing the details of how one designer elected to split functionality between the two is especially useful. Making embedded code invisible discards a very important learning opportunity. -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Fri Jan 12 14:12:56 1996 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom4!faunt From: faunt@netcom4.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Subject: Re: Re:QST Tuner Article In-Reply-To: mack@mails.imed.COM's message of 11 Jan 96 14:29:13 GMT Message-ID: Sender: faunt@netcom4.netcom.com Organization: at home, in Oakland References: <9600118213.AA821378459@mails.imed.com> Date: Thu, 11 Jan 1996 17:15:59 GMT Lines: 59 Xref: news.epix.net rec.radio.amateur.homebrew:12646 rec.radio.amateur.antenna:18376 Does the copyleft protect the authors from someone else using the code in a commercial product, or just specify that all changes, as well as the original source must be made available? The article has got enough information to be useful as it is, both as a kit and as food for thought, and I don't fault the ARRL for publishing it, but it's frustrating that to do anything with that, you'd have to reconstruct the code, instead of being able to build on what's gone before. It looks to me as if the MC68HC811E2 is compatible with the -A1 part used in the article, and has 4 times as much EEPROM for the code. This would give lots of room for additional functions. Also, the PD0 and PD1 asynchronous serial port pins are just connected to each other, and with the addition of an RS-232 converter could perhaps be used to connect to a computer, or other remote controller. I also wonder why, apparently, the unit stops tuning when it gets to a specified level, and doesn't actually continue to find best match. In addition, there seem to be four more A/D ports available, and I wonder if a phase detector or other sensor could be added to make for an even more efficient match hunting algorithm. My preliminary checking indicates that developement hardware and software for these microprocessors are readily available and cheap. Check out "Nuts and Volts" or the 68HC11 microcontroller FAQ. Also, if you just doubled the values of the capacitors and/or the inductors, how much would you trade optimization of match for extended capability on 160M (how much extended capability)? This version doesn't require the code, BTW, just the kit, a couple of capacitors, and some wire. If you were willing to sacrifice some of the indicators (use an external SWR meter, say), or use the async port for control and status, you could, I think, extend the range on 160M, without sacrificing optimization, but this again requires modifying the code. I rather wonder if I'd have paid as much attention to the article if there hadn't been so much controversy about it. 73, doug From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Date: 11 Jan 96 14:29:13 GMT I would encourage authors to incorporate the "copyleft" of the Free Software Foundation. This is a more restrictive copyright. It says that if you modify the software for your personal use and make improvements, you must share those improvements freely with others. This is the spirit of amateur radio at its best, IMHO. BTW, the article was a really neat idea. I may build one similar soon. Ray Mack WD5IFS mack@mails.imed.com From lwbyppp@epix.net Fri Jan 12 14:12:57 1996 Path: news.epix.net!news.sprintlink.net!HiWAAY.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: 8 Jan 1996 21:14:05 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 21 Sender: root@newsbf02.news.aol.com Message-ID: <4csj1d$c92@newsbf02.news.aol.com> References: <820988469.19749@pinetree.microserve.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <820988469.19749@pinetree.microserve.com>, jackl@pinetree.microserve.com (WB3U) writes: >>The Vomax was a split band audio processor which is superior to RF >>processing. I still use a modified VOMAX with my 751A. > >Tom, could you elaborate on this? I was surprised by your statement, >given the 8 dB or so improvement possible with RF processing. Of >course, I can see how splitting the audio spectrum to enable effective >filtering of harmonics could be as effective, but not more so. I'll defer to Wes on this, but briefly when clipping is done at audio, you can process small bands that are are less than one octive wide. Harmonics from clipping not only fall outside the passband of channels, but mixing is reduced because there is little likelyhood two tones will appear in one clipping channel at any one time. RF clipping does not do this, unless the processor has several very narrow filters feeding separate clippers. 73 Tom From lwbyppp@epix.net Fri Jan 12 14:12:58 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Question: RF Speech Processing Message-ID: <1996Jan10.161525.19926@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <4cmp0n$2fb@newsbf02.news.aol.com> <820988469.19749@pinetree.microserve.com> <1996Jan7.200411.6084@ke4zv.atl.ga.us> <821098902.19663@pinetree.microserve.com> Date: Wed, 10 Jan 1996 16:15:25 GMT Lines: 52 In article <821098902.19663@pinetree.microserve.com> jackl@pinetree.microserve .com (WB3U) writes: > gary@ke4zv.atl.ga.us (Gary Coffman) wrote: > >>You know what AM sounds like under selective fading, well the same >>thing is possible here if the clipping of the upper and lower >>sidebands isn't precisely symmetrical in both the amplitude and >>frequency domains. The latter is what's different about DSB. > > >Looking at this somewhat empirically, the RF processor in my previous >rig clipped the SSB signal at an IF frequency of 3.18 MHz. Because it >was SSB, the passband width was approximately 3 KHz. That means the >passband width was 0.094%, only slightly less than the 0.1% for the >DSB processor at 6 MHz. If this percentage bandwidth can be >symmetrically clipped for SSB at 3.18 MHz, would you agree that non- >symmetrical clipping probably won't be a factor with DSB at 6 MHz, >assuming the circuitry is otherwise similar? I couldn't say, because one case is SSB and the other is DSB. There's more than just bandwidth at stake here. SSB demodulation is just a down-conversion mixing process. If there are phase shifts between the highest and lowest frequencies, you just get a little time distortion, IE the old click-boom effect familiar to users of horn speakers. But DSB demodulation is different. There, the output audio is the vector sum of the two sidebands with respect to the reinserted carrier. If one sideband is phase delayed with respect to the other, amplitude distortions and waveshape changes occur in the output. Any shaping done after modulation and before demodulation may result in a phase delay between the matching components of the sidebands, and that will in turn lead to amplitude and waveshape distortion in the output audio for DSB. I believe the correct factor we should be concerned about is called group delay. The classic example of this occurs in a VSB TV transmitter. You'll get a nasty spike on the tip of sync when you demodulate the signal because one sideband is delayed differently than the other through the transmitter. The cure requires *predistorting* the modulating waveform so that the incidental phase delay introduced by the system is cancelled out. The bandwidth for a channel 11 transmitter and H sync is 0.015%, but that's not the important measure. The important measure is the differential delay through the system. That only needs to be a few degrees at 200 MHz, a very small time difference indeed. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Jan 12 14:13:00 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!news.funet.fi!news.cc.tut.fi!proffa.cc.tut.fi!not-for-mail From: k23690@proffa.cc.tut.fi (Kein{nen Paul) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: 10 Jan 1996 17:09:21 +0200 Organization: Tampere University of Technology Lines: 88 Distribution: world Message-ID: <4d0kr1$1nl@proffa.cc.tut.fi> References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <4cmp0n$2fb@newsbf02.news.aol.com> <820988469.19749@pinetree.microserve.com> NNTP-Posting-Host: proffa.cc.tut.fi jackl@pinetree.microserve.com (WB3U) wrote: > w8jitom@aol.com (W8JI Tom) wrote: >>The Vomax was a split band audio processor which is superior to RF >>processing. I still use a modified VOMAX with my 751A. > > Tom, could you elaborate on this? I was surprised by your statement, > given the 8 dB or so improvement possible with RF processing. Of > course, I can see how splitting the audio spectrum to enable effective > filtering of harmonics could be as effective, but not more so. I have wondered about this too. I know that multi-band processors are used to reduce the dynamic range (eg. in Dolby A and in more modern variants), but usually it is about reducing the dynamic range from, say 60 dB to 40 dB for storage on tape etc. However, if you are going to use aggressive clipping to reduce the peak to average ratio, I do not see how tis would improve the situation a lot. If you split the signal into multiple subbands, clip each of them, filter out any out of band harmonics and combine the subbands into a single stream for transmission, you can still get some nasty high peaks, if the phase relationship is unfavorable. Think about a simple waveform consisting of frequencies f and 2f and both have the positive peak at the same time (this resemples the speech waveform). aAssume that f and 2f fall into different subbands as clean stable sinus signals with no need for clipping. Summing these signals and you get a positive peak twice as high as the individual signal. This corresponds to four time peak power in an SSB transmitter compared to a single tone. You have gained nothing with a multiband clipper. [About DSB clipping] > I thought about that too, but I don't see how the distortion products > could fall in the RF passband. For instance, let's say the balanced > modulator is operating at 6 MHz and that it's modulated with a 1 KHz > tone. The output will be two carriers (DSB), one at 5,999 KHz and > the other at 6,001 KHz. What combination of those two carriers > produces a distortion product that falls near the two fundamentals? How about third (and 5th) order intermodulation products ? 2*6001-5999 = 6003 kHz and 2*5999-6001=5997 kHz and after detection you have two signals at 3 kHz. However, a single tone is not a realistic test signal for a clipper. Assuming a simple two tone signal with 400 Hz and 1000 Hz tones, you get in addition to the 3rd order products for the 1000 Hz tones (as above) also the 3rd order products of the 400 Hz tones. Calculating all the intermodulation products up to the 5th order, will for the DSB case products produce within +/- 4 kHz of the DSB carrier: 3rd order 6.0002, 6.0010, 6.0012, 6.0016, 6.0018, 6.0024, 6.0030 MHz 5th order 6.0002, 6.0004, 6.0006, 6.0008, 6.0008, 6.0010, 6.0012, 6.0016, 6.0018, 6.0020, 6.0022, 6.0024, 6.0026, 6.0030, 6.0032, 6.0032, 6.0036, 6.0038 MHz After the product detector you get intermodulation products practically every 200 Hz. In SSB clipping the only intermodulation products that fall within 4/- 4 kHz of the carrier are: 3rd order 5.9998, 6.0016 MHz 5th order 5.9992, 6.0022 MHz if there is an USB filter after the clipper, the only audible IM products are 1.6 kHz and 2.2 kHz. If you run the test with more tones that are not harmonically related to each other, the difference is even more evident. Paul OH3LWR -- Phone : +358-31-213 3657 Mail: Hameenpuisto 42 A 26 Internet: Paul.Keinanen@cc.tut.fi FIN-33200 TAMPERE Telex : 58-100 1825 (ATTN: Keinanen Paul) FINLAND X.400 : G=Paul S=Keinanen O=Kotiposti A=ELISA C=FI From lwbyppp@epix.net Fri Jan 12 14:13:01 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!fdn.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!scsing.switch.ch!news.belwue.de!news.dfn.de!gs.dfn.de!uni-erlangen.de!lrz-muenchen.de!news.unibw-muenchen.de!bauv111!claude From: claude@bauv.unibw-muenchen.de (Claude Frantz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: 10 Jan 96 08:32:12 GMT Organization: University of the Federal Armed Forces Munich Lines: 8 Message-ID: References: <821099029.19663@pinetree.microserve.com> <4ctglh$ns2@newsbf02.news.aol.com> NNTP-Posting-Host: bauv111.bauv.unibw-muenchen.de X-Newsreader: NN version 6.5.0 #3 (NOV) w8jitom@aol.com (W8JI Tom) writes: >I'm working on a DSP based processor now, in between 999 other things. Can you give us more information about this work ? Thanks es 73, Claude From lwbyppp@epix.net Fri Jan 12 14:13:02 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: tantonr@aol.com (TANTONR) Newsgroups: rec.radio.amateur.homebrew Subject: Re: recommend good kids' crystal set? Date: 10 Jan 1996 17:40:40 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 2 Sender: root@newsbf02.news.aol.com Message-ID: <4d1f98$9js@newsbf02.news.aol.com> References: <30F0539E.5857@tiger.ab.ca> Reply-To: tantonr@aol.com (TANTONR) NNTP-Posting-Host: newsbf02.mail.aol.com Ramsey electronics markets one with a real piece of galena in it. You can reach them at (716) 924-4560 weekdays. From lwbyppp@epix.net Fri Jan 12 14:13:03 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!news.kei.com!newsfeed.internetmci.com!cdc2.cdc.net!news1.cris.com!news2.acs.oakland.edu!newshub.gmr.com!news.delcoelect.com!usenet From: Tom Pfaffenbach Newsgroups: rec.radio.amateur.homebrew Subject: Re: recommend good kids' crystal set? Date: 11 Jan 1996 18:56:01 GMT Organization: Delco Electronics Lines: 9 Distribution: usa Message-ID: <4d3mg1$4rt@kocrsv08.delcoelect.com> References: <30F0539E.5857@tiger.ab.ca> <4d1f98$9js@newsbf02.news.aol.com> NNTP-Posting-Host: koprpc05.delcoelect.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1 (Windows; I; 16bit) To: tantonr@aol.com When my boys were in scouts, the scout leader asked me about crystal sets. I o ffered a slightly different suggestion for a project. W e bought RadioShack "Flavor-Radio's for about 5$ apiece, disassembled them int o semi-kit form, ie: case, speaker, battery, and circuit board, and set up an oscillator, voltm eter and soldering station. We helped helped each of the boys with re-assembly, after letting them test the battery and the speaker and earphone. Over about 3 meetings each boy learn ed something about electronics, and had a real working radio that he had built and could sh ow off without a 100' outdoor antenna. From lwbyppp@epix.net Fri Jan 12 14:13:05 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!EU.net!Norway.EU.net!nntp-oslo.UNINETT.no!nntp-trd.UNINETT.no!oslonett.no!sn.no!newsfeed.tip.net!zorn.mnet.medstroms.se!everyday From: g_walles@maxinet.medstroms.se (Göran Walles) Newsgroups: rec.radio.amateur.homebrew Subject: REQ: RDS encoder Date: Thu, 11 Jan 96 22:48:00 GMT Lines: 9 Message-ID: <4d40tm$no3@zorn.mnet.medstroms.se> NNTP-Posting-Host: 2.ts1.mnet.medstroms.se Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: News Xpress Version 1.0 Beta #4 I'm looking for schematic diagrams to build a RDS(Radio Data System) encoder to be used with an FM-transmitter. Please e-mail any information to: g_walles@maxinet.medstroms.se Thanks ! SM0SUV - Göran From lwbyppp@epix.net Fri Jan 12 14:13:06 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!enews.sgi.com!decwrl!pa.dec.com!depot.mro.dec.com!mrnews.mro.dec.com!est.enet.dec.com!randolph From: randolph@est.enet.dec.com (Tom Randolph) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Reselling the home brew equipment Date: 10 JAN 96 14:11:43 Organization: Digital Equipment Corporation Lines: 20 Message-ID: <4d13uu$b01@mrnews.mro.dec.com> References: <4cf5k1$4dd@service-2.agate.net> <1996Jan4.163659.21155@ke4zv.atl.ga.us> NNTP-Posting-Host: pipa.enet.dec.com In article <1996Jan4.163659.21155@ke4zv.atl.ga.us>, gary@ke4zv.atl.ga.us (Gary Coffman) writes... >Now that should give you an idea how to increase the value of your >homebrew gear on the market. Make sure there is full documentation, >operating instructions, schematics, theory of operation, parts lists, >and even X-ray view board layouts if applicable. And, based on the Motorola Micor standard of documentation: test and alignment procedures, test equipment, circuit revision lists. The last thing I do for any homebrew project is to draw up a nice, neat schematic, by hand or Postscript. I put in a few annotations to help explain anything that might be good to know down the road. If possible, I also make a little bitty photocopy of this to tape inside the cover of the project itself. I have them all together in a 3-ring binder next to my workbench. If I want to modify a circuit, the schematic is in my hands in seconds. ============================================================================== Tom Randolph N1OOQ NE-QRP 419 QRP-L 87 ARRL randolph@est.enet.dec.com ============================================================================== From lwbyppp@epix.net Fri Jan 12 14:13:07 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!spool.mu.edu!news.sol.net!news.inc.net!uwm.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Re: Reselling the home brew equipment Date: 11 Jan 1996 03:22:45 GMT Organization: Los Alamos National Laboratory Lines: 15 Message-ID: <4d1vq5$o6p@newshost.lanl.gov> References: <4cf5k1$4dd@service-2.agate.net> <1996Jan4.163659.21155@ke4zv.atl.ga.us> <4d13uu$b01@mrnews.mro.dec.com> NNTP-Posting-Host: jdport.lanl.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) To: randolph@est.enet.dec.com I agree, I now create schematics and date of manufacture etc and tape them inside the cover of the project or enclose them inside somewhere.... that is mostly for my OWN benefit when something dies inside later. It's wonderful not having to try tracking down the original design, notes, etc, that may have been lost or misplaced. -- |-------------------------------------------------------| |Jim Devenport WB5AOX | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |-------------------------------------------------------| From lwbyppp@epix.net Fri Jan 12 14:13:08 1996 Path: news.epix.net!news.sprintlink.net!news.heurikon.com!news.ahc.ameritech.com!ddsw1!news.mcs.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!gatech!newsfeed.internetmci.com!solaris.cc.vt.edu!news.new-york.net!earth.njcc.com!usenet From: ahusik@pluto.njcc.com (Adam Husik) Newsgroups: rec.radio.amateur.homebrew Subject: Standard Modification Date: Wed, 10 Jan 1996 17:30:40 GMT Organization: New Jersey Computer Connection, Lawrenceville, NJ Lines: 13 Message-ID: <4d0ilt$s5k@earth.njcc.com> NNTP-Posting-Host: husik.njcc.com X-Newsreader: Forte Free Agent 1.0.82 Would anyone who has performed the Standard C508A modification be willing to answer a few questions for me via email. I can't figure out how to get the battery out (I tried a soldering iron but it wouldn't come out... is it really necesary to remove it?) Also, I I see the SMT component for cell rx (all the way in the upper-right corner?) but I cannot find the extended rx/tx one by the CPU. What CPU!?! I'm going out of my mind. Anyone out there that can help? Adam From lwbyppp@epix.net Fri Jan 12 14:13:09 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!fury.berkshire.net!op.net!news.fyionline.com!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!mozz.unh.edu!!moore From: moore@ (Andrew M. Moore) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ten Tec 2M Transceiver Kit Date: 10 Jan 1996 01:49:29 GMT Organization: UNH Space Science Center Lines: 11 Distribution: usa Message-ID: <4cv5v9$ilh@mozz.unh.edu> References: <1996Jan4.194321.18158@news.wrc.xerox.com> <8209313101901@lss.humnet.humberc.on.ca> NNTP-Posting-Host: moore.sr.unh.edu >> Does anyone knwo if Ten Tec ever intends to produce this kit or is >> it permanently "temporarily discontinued" ? >I was told that the 2-meter transceiver kit should be available >within the next month or 2. (They say that they will not release When I spoke with them around January 1, the expected release date was February 1. I'm really looking forward to the release of this kit. _ _ _ _ _ _ _ _ -Drew || o || NV1B CFO#963 CW || o || From lwbyppp@epix.net Fri Jan 12 14:13:10 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!jmatk.tiac.net!user From: jmatk@tscm.com (James M. Atkinson, Communications Engineer) Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,alt.radio.scanner Subject: TSCM Counter Surveillance & Technical Security Page Date: Wed, 10 Jan 1996 20:22:02 -0500 Organization: tscm.com Lines: 21 Message-ID: Reply-To: jmatk@tscm.com NNTP-Posting-Host: jmatk.tiac.net Keywords: Counterintelligence Debugging Surviellance Counter-Terrorism X-Newsreader: Yet Another NewsWatcher 2.1.3 Xref: news.epix.net rec.radio.amateur.digital.misc:13572 rec.radio.amateur.homebrew:12642 alt.radio.scanner:26421 We now have over 600 pages of materials on-line, over 200 photographs, hundreds of frequencies... and we're growing rapidly http://www.tscm.com/ Detailed listing of tools Comprehensive reviews of TSCM equipment Huge Publications listing Comments on TSCM training courses =============================================================== James M. Atkinson "...Shaken, not Stirred..." TSCM.COM 127 Eastern Avenue #291 Gloucester, MA 01931-8008 URL: http://www.tscm.com/ E-Mail: jmatk@tscm.com =============================================================== The First, The Largest, The Most Popular, and the Most Complete TSCM Counterintelligence Site on the Internet =============================================================== From lwbyppp@epix.net Fri Jan 12 14:13:10 1996 Path: news.epix.net!news.sprintlink.net!news.itsnet.com!a_wallace1.dtint.com!allen From: Allen Wallace Newsgroups: rec.radio.amateur.homebrew Subject: UHF noise source Date: 9 Jan 1996 23:32:29 GMT Organization: Digital Technology International Lines: 14 Distribution: world Message-ID: <4cutud$gc8@itchy.itsnet.com> NNTP-Posting-Host: gatekeeper0.wia.net X-UserAgent: Version 1.1.3 X-XXMessage-ID: X-XXDate: Tue, 9 Jan 96 23:11:14 GMT I've got a 1960's UHF noise source which I'd like some information. It has a tube labled TD-44/7988 and is about 18 inches long. The assembly has two UHF connectors, The tube has two wires. How did these old noise generators work? what voltages did they use? How much excess noise did the generate? Thanks, 73 Allen Wallace, N7CGH From lwbyppp@epix.net Fri Jan 12 14:13:12 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr3ip47.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: UHF noise source Date: Tue, 9 Jan 1996 21:05:30 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 33 Distribution: world Message-ID: References: <4cutud$gc8@itchy.itsnet.com> NNTP-Posting-Host: usr3ip47.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4cutud$gc8@itchy.itsnet.com> Allen Wallace writes: >From: Allen Wallace >Subject: UHF noise source >Date: 9 Jan 1996 23:32:29 GMT >I've got a 1960's UHF noise source which I'd like some information. >It has a tube labled TD-44/7988 and is about 18 inches long. The assembly >has two UHF connectors, The tube has two wires. >How did these old noise generators work? what voltages did they use? How >much excess noise did the generate? >Thanks, >73 >Allen Wallace, N7CGH Allen: I could be (and probably am) way off here, but this sort of sounds like a gas discharge system. In the ancient past, we used waveguide versions which had a gas filled tube inserted at an angle through a waveguide. One end was terminated and the other was the output spigot. I seem to remember ENRs of 15 dB or so. We had systems by both HP and AIL. If this is a gas tube, then it requires a high voltage pulse to fire it. I can't remember what "high" means any more though:( One caution: if it is a gas tube and you learn how to power it, these were very likely to generate voltage spikes at the output which would be instant death for modern solid-state devices. 73, Wes -- N7WS From lwbyppp@epix.net Fri Jan 12 14:13:13 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!wizard.pn.com!dns.crocker.com!calweb!usenet From: billj@calweb.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: UHF noise source Date: 10 Jan 1996 22:46:43 GMT Organization: CalWeb Internet Services, Inc. Lines: 23 Message-ID: <4d1fkj$9gb@news.calweb.com> References: <4cutud$gc8@itchy.itsnet.com> NNTP-Posting-Host: sac2-93.calweb.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) Allen Wallace wrote: >I've got a 1960's UHF noise source which I'd like some information. > >It has a tube labled TD-44/7988 and is about 18 inches long. The assembly >has two UHF connectors, The tube has two wires. > >How did these old noise generators work? what voltages did they use? How >much excess noise did the generate? > >Thanks, > > >73 > >Allen Wallace, N7CGH Ok I will make a fool of myself. Maybe someone can correct me but I seem to remember that a Mercury vapor lamp (florecent lamp) can be used as a noise generator. You can calculate the noise temperature from the lamp current. I seem to remember that DC was used to power the lamp. I think this design goes back to the 1950 - 1960 time frame. Bill K7NOM From lwbyppp@epix.net Fri Jan 12 14:13:14 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!wizard.pn.com!dns.crocker.com!calweb!usenet From: billj@calweb.com Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: Re: Using HP8690 with HP8410 Network Analyzer ??? Date: 10 Jan 1996 22:50:58 GMT Organization: CalWeb Internet Services, Inc. Lines: 15 Message-ID: <4d1fsi$9gb@news.calweb.com> References: <4c1moh$a1d@nntp3.news.primenet.com> <4c22uj$mfg@nntp3.news.primenet.com> <820869685snz@microvst.demon.co.uk> <4ct03i$482@composer.inav.net> NNTP-Posting-Host: sac2-93.calweb.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) Xref: news.epix.net rec.radio.amateur.homebrew:12639 rec.radio.amateur.equipment:23613 Steve Sawyers n0yvy wrote: > A cheaper alternative to paper copies is to get the micro >fiche. It is about 20% of paper and I got a nice fiche >reader at teh the local ham fest for $15. > >Now I just order the fiche and forget the paper.Takes up >less shelf space too. > >de steve n0yvy > I just go to the local library and use their viewer/printer to get my paper copies. The service from HP has been very good. Bill K7NOM From lwbyppp@epix.net Fri Jan 12 14:13:15 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: VCO power supply noise reduction Message-ID: <1996Jan10.161901.20012@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ch6gf$56k@abyss.West.Sun.COM> Date: Wed, 10 Jan 1996 16:19:01 GMT Lines: 23 In article <4ch6gf$56k@abyss.West.Sun.COM> myers@West.Sun.COM (Dana Myers) wri tes: >One technique I've used and seen used elsewhere to reduce the noise >on a power line is to insert an emitter follower into the >power line. The base of the emitter follower is biased from a >resistive voltage divider attached to the collector (which forms >the "input"), and a fairly large filter capacitor in parallel with >a smaller one is attached from the base to ground. I've never >actually measured the noise reduction of this arrangement, but >SPICE suggests it is significant. I believe it is fair to >analyze this circuit as an RC low pass filter with an emitter >follower added to reduce the output impedance. This circuit is normally treated as an electronically amplified capacitor, IE it is modeled as a capacitor with a value set to that of the actual base capacitor multiplied by the transistor beta. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Jan 12 14:13:16 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr2ip25.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VCO power supply noise reduction Date: Wed, 10 Jan 1996 20:32:10 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 51 Message-ID: References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> NNTP-Posting-Host: usr2ip25.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <1996Jan10.161901.20012@ke4zv.atl.ga.us> gary@ke4zv.atl.ga.us (Gary Coffman) writes: >From: gary@ke4zv.atl.ga.us (Gary Coffman) >Subject: Re: VCO power supply noise reduction >Date: Wed, 10 Jan 1996 16:19:01 GMT >In article <4ch6gf$56k@abyss.West.Sun.COM> myers@West.Sun.COM (Dana Myers) >writes: >>One technique I've used and seen used elsewhere to reduce the noise >>on a power line is to insert an emitter follower into the >>power line. The base of the emitter follower is biased from a >>resistive voltage divider attached to the collector (which forms >>the "input"), and a fairly large filter capacitor in parallel with >>a smaller one is attached from the base to ground. I've never >>actually measured the noise reduction of this arrangement, but >>SPICE suggests it is significant. I believe it is fair to >>analyze this circuit as an RC low pass filter with an emitter >>follower added to reduce the output impedance. >This circuit is normally treated as an electronically amplified >capacitor, IE it is modeled as a capacitor with a value set to >that of the actual base capacitor multiplied by the transistor >beta. Be really careful here. I recently had to perform a failure analysis on a VCO hybrid manufactured by a *very* well known semiconductor and hybrid house. For obvious reasons, I must be necessarily vague about some of this. Under certain conditions, of temperature, voltage and phase of the moon, we were experiencing severe spurious sidebands on the UHF output. This device used a Motorola 7812 chip as the voltage regulator and I pretty quickly ascertained that the regulator was oscillating and modulating the VCO. Because our application specified certain immunity to noise on the supply voltage to this device, the hybrid manufacturer used an emitter follower as described above to pick up a few dB of noise rejection. Because of space limitations, he had room for only one filter capacitor (.33 uF tantalum) so obviously, he used it on the emitter follower base. However, Motorola specifies a minimum of .33 uF on the input of the regulator chip for stability. Conversations with a Motorola application engineer confirmed this. By wire-bonding the cap directly to the regulator input, I was able to stabilize the regulator, confirming that this was the problem. Lesson learned: The capacitance multiplier idea may work sometimes, but without *very* careful analysis, you might get into real trouble. Regards, Wes -- N7WS From lwbyppp@epix.net Fri Jan 12 14:13:17 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!fdn.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!scsing.switch.ch!news.belwue.de!news.dfn.de!gs.dfn.de!uni-erlangen.de!lrz-muenchen.de!news.unibw-muenchen.de!bauv111!claude From: claude@bauv.unibw-muenchen.de (Claude Frantz) Newsgroups: rec.radio.amateur.homebrew Subject: VXO Date: 10 Jan 96 08:30:23 GMT Organization: University of the Federal Armed Forces Munich Lines: 5 Message-ID: NNTP-Posting-Host: bauv111.bauv.unibw-muenchen.de X-Newsreader: NN version 6.5.0 #3 (NOV) Can you give me information about good available VXO ? Many thanks. Claude From lwbyppp@epix.net Wed Jan 17 14:39:51 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news.cac.psu.edu!usenet From: John Passaneau Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space Subject: Re: ***Ham WEB page For all people to use! Give it a TRY*** Date: Tue, 16 Jan 1996 15:47:00 -0800 Organization: Penn State University Lines: 20 Message-ID: <30FC38F4.2EEC@leps.phys.psu.edu> References: <4df36s$3lt@fnord.dfw.net> NNTP-Posting-Host: thing-two.phys.psu.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win16; I) Xref: news.epix.net rec.radio.amateur.equipment:23827 rec.radio.amateur.antenna:18501 rec.radio.amateur.digital.misc:13643 rec.radio.amateur.homebrew:12755 rec.radio.amateur.misc:96988 rec.radio.amateur.policy:32577 rec.radio.amateur.space:6142 David Mclean wrote: > > Hello to all: > > Come a take a look at my new web page. I have been working on it for > the last 4 weeks. I have lots of thing that you will like. Some of the > things that I have are: MODs, Swap Shop, Dfw repeter list, comment page, > links to other good ham pages, call looks ups (updated by the sec), radio > pricing, Links to QRZ,FCC,HRO, and many more. If you are a ham and would > like you web page added to my list just send me e-mail. Please tell me > what you like and dislike about the page. I want all types of comments. > Hope you like what I have. > > -- > David Mclean > From The World of Hamradio > KC5NNV is Clear! > _________________________________________________________________________> - ------------------------------------------------------------------------ It might have been nice to put the address in the message. John Passaneau, WB8EIY, State College Pa. From lwbyppp@epix.net Wed Jan 17 14:39:53 1996 From: n0nas@hamlink.mn.org (Doug Reed) Path: news.epix.net!news.sprintlink.net!news.clark.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!rosevax!hamlink!fredmail Newsgroups: rec.radio.amateur.homebrew Subject: 10ghz Audio link Message-ID: <821642510.AA04980@hamlink.mn.org> Date: Sun, 14 Jan 1996 16:48:27 -0100 X-FTN-To: Mbrown@lilly.com Lines: 68 The basic method of using a 10 GHz motion detector or Gunnplexor for a full duplex audio link is quite simple. All you really do is set up the first Gunnplexor in the ham band and apply a small amount of audio to the voltage regulator feeding the Gunn diode. This causes the 10 GHz oscillator to be frequency modulated by the audio signal. Now at the other end, you connect a wideband receiver to the detector diode of the other Gunnplexor and tune the second Gunn oscillator to be higher or lower in frequency by whatever the receiver frequency is. For amateur 10 GHz voice, this is usually 30 MHz and about 75 KHz bandwidth. This is 1/2 of the full duplex link. To go back the other way you voice modulate the second Gunn oscillator and add another wideband FM receiver at the same 30 MHz receive offset to the detector diode of the first Gunn unit. You finish off the link by generating an AFC output from one receiver to adjust the static regulated voltage on its Gunn oscillator. Then, whenever the first unit drifts in frequency, the second unit will follow always keeping 30 MHz away. NOTE: there is nothing hard and fast about the IF frequency you use, just that ALL the stations must use the same IF in order to communicate. The limitations on this technique are primarily the low power from the Gunn oscillators, their wide frequency variation with temperature, and poor range due in part to the wideband FM modulation. Various articles have suggested anything up to 200 mile range using SSB and 50 to 100 mw with a dish on 10 GHz. The FM voice system would do well to get 10 miles with a 10 mw motion detector transmitter. The ARRL article will basically do the voice link if you drop the data specific stuff. If you want more info on using Gunnplexors and motion detectors for 10 GHz, the most recent info will be in the "Above and Beyond" column in 73 magazine during the last 5 years. And before that there were numerous articles about 10 GHz in Ham Radio and 73 Magazine in the 1980's. When you go looking for equipment, the best parts to find are the Microwave Associates Gunnplexor units. They were designed for communications and have a modulator diode along with the usual oscillator and detector diodes. This makes them more stable and easier to modulate but they generally sell for over $200. The cheap option is an old microwave motion detector from an alarm system. The 10 GHz section is an aluminum block about 1.2" by 1.8" by 2.5" with a feedhorn or square flange on one end. These only have the oscillator diode and detector diode. Modulation must be floated on the static operating voltage of the oscillator diode. They usually run about 10 mw output and cost under $25. Whatever model you choose it should have a standard waveguide flange so you can connect to different horns or mount it in front of a parabolic dish for maximum range. If you are really just playing around, some old X-band radar detectors can be stripped sometimes for this type of project but strictly as a backyard receiver project. I did some brain storming about this a few years ago. You might want to look for some old surplus low band FM receivers in the 30-40 MHz band. Many of them have wideband (30 KHz) IFs and all have excellent sensitivity. Every pair you find on one frequency can be another link. Lets say you find receiver pairs for 31, 32, 33, and 34 MHz. Build one site as the central site with four receivers and four separate remote sites each with one receiver. The remote sites are each tuned slightly different from the central site and is AGCed to lock to the central site. At the central site, add a low noise preamp to split the signal for all four receivers and you should have four working remote receiver voice links. I always thought this would be a cute repeater receiver linking system but never took it anywhere. Have fun with 10 GHZ. 73's. Doug Reed, N0NAS email: n0nas@hamlink.mn.org * SLMR 2.1a * Unable to locate Coffee -- Operator Halted! From lwbyppp@epix.net Wed Jan 17 14:39:54 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: 900 MHz Security Date: Fri, 12 Jan 96 08:00:20 PDT Organization: Northwest Nexus Inc. Lines: 20 Message-ID: References: <4cjv14$naq@abyss.West.Sun.COM> <4d3oim$tse@n0jcf.com> NNTP-Posting-Host: blv-pm2-ip2.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage In article <4d3oim$tse@n0jcf.com>, writes: > ---snip > However-- my Tropez 900DL (of which the ATT9100 is a clone) > transmits a fairly powerful "image" in the clear on roughly > 435 MHz. > ----snip > Chris Elmquist, N0JCF > chrise@n0jcf.com > n0jcf@amsat.org > Thanks for the information Chris. I have the Tropez 900DX and I suspect that it has the same problem. I hadn'd pursued it, but had noticed that it interfered with my handheld when they were in the same room. I'll have to check closer, I never tried to listen while the phone was in use. Jay From lwbyppp@epix.net Wed Jan 17 14:39:55 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!centralnews1.Central.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!usenet From: "Dana H. Myers" Newsgroups: rec.radio.amateur.homebrew Subject: Re: 900 MHz Security Date: 12 Jan 1996 17:26:17 GMT Organization: Sunsoft, Los Angeles Lines: 38 Message-ID: <4d65jp$p59@abyss.West.Sun.COM> References: <4cjv14$naq@abyss.West.Sun.COM> <4d3oim$tse@n0jcf.com> NNTP-Posting-Host: vr1000p.west.sun.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1 (X11; I; SunOS 5.5 i86pc) X-URL: news:4d3oim$tse@n0jcf.com chrise@n0jcf.com (Chris Elmquist) wrote: >In article <4cjv14$naq@abyss.West.Sun.COM>, >Dana Myers wrote: >>In article , >>Jack Mott wrote: >>>This posting is off-subject for this newsgroup, but I wanted access to >>>the technical knowledge available here. I have a 900 MHz digital >>>cordless phone (ATT 9100), and I am interested in how secure this type of >>>phone is with respect to over-the-air eavesdropping. Please give a >>>specific, technical answer addressing issues such as RF modulation and >>>digital encoding. If you post a response, please also send e-mail. >> >>The ATT 9100 uses wideband FM, modulated with the CVSD data produced >>by a Motorola MC3418. I suppose someone could build a receiver >>or tweak another 9100 to eavesdrop, but, as far as I can tell, this >>is impractical enough to be of little concern. >> >>Certainly it is much more secure than a conventional analog FM >>phone, and even much more secure than a frequency-inversion >>scrambled phone. It isn't encrypted, but I would say it is >>essentially secure. I'm not a security expert, though ;-) >> > >However-- my Tropez 900DL (of which the ATT9100 is a clone) transmits >a fairly powerful "image" in the clear on roughly 435 MHz. I discovered >this about a year ago and made a posting or two about it. I even >contacted Tropez and had a dialog going with someone (a ham even) in >their engineering group. He promised to look into it and get back >to me... well, surprise... no response. I probably could start >pestering again but currently it's not bothering me too much. I'm >down on 432 where I don't hear it. OSCAR ops would be another story. I listened for this on my 9100, and could not hear it. I did hear what appeared to be a very low level spur around 435MHz, but it was not modulated and it was only heard with the handset about 1 foot from the scanner antenna. I may have been overloading the scanner front end with the handset... From lwbyppp@epix.net Wed Jan 17 14:39:56 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: ? Vaacuum Capacitors Date: 15 Jan 1996 12:26:36 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 27 Sender: root@newsbf02.news.aol.com Message-ID: <4de2oc$1c9@newsbf02.news.aol.com> References: <30FAE357@SmtpGate.Oen1.Oen.Siemens.De> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <30FAE357@SmtpGate.Oen1.Oen.Siemens.De>, guenter.koellner@oen.siemens.DE (Koellner, Guenter) writes: >Are they tuned with pressing the axis or rotating it? If rotating, what is >the roation angle and what force has to be applied? Much more than a >standard >capacitor? > >Thanks for your answer! > >vy 73, Guenter, Hi Guenter, They are tuned by pulling (about 1/2 to 2 inches travel usually, depending on the size) the axis against the suction of the vacuum, or by rotating a screw shaft (5 to twenty turns, usually) that converts the motion to the pull required. The capacitors are internally like a series of alternating concentric cylinders. One connects to a bellows that allows movement while sealing the vacuum. It telescopes in and out to mesh and un-mesh. There are no friction contacts, and the internal leads are short and wide. So Q is very good. 73 Tom From lwbyppp@epix.net Wed Jan 17 14:39:57 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.minn.net!skypoint.com!news3.mr.net!mr.net!imci2!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: guenter.koellner@oen.siemens.DE (Koellner, Guenter) Newsgroups: rec.radio.amateur.homebrew Subject: ? Vaacuum Capacitors Date: 15 Jan 96 23:25:00 GMT Organization: ucsd usenet gateway Lines: 17 Message-ID: <30FAE357@SmtpGate.Oen1.Oen.Siemens.De> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Hello! a simple question, but can anyone tell me how to use vaacuum capacitors? These are often mentioned in stateside homebrew descriptions, maybe your surplus market is larger... Are they tuned with pressing the axis or rotating it? If rotating, what is the roation angle and what force has to be applied? Much more than a standard capacitor? Thanks for your answer! vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU (AX.25) DL4MEA@AMSAT.ORG (Internet) HTTP://WWW.SCN.DE/~KOELLNER (WWW) From lwbyppp@epix.net Wed Jan 17 14:39:58 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci2!newsfeed.internetmci.com!in1.uu.net!news.interlog.com!winternet.com!visi.com!usenet From: jmf@visi.com (Joe Fishbein) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Amidon? Date: Fri, 12 Jan 1996 02:38:57 GMT Organization: Vector Internet Services, Inc. Lines: 24 Message-ID: <4d4gqd$bpk@news.visi.com> References: <4d3bq3$8bm@bristlecone.together.net> Reply-To: jmf@visi.com NNTP-Posting-Host: ppp34.visi.com X-Newsreader: Forte Free Agent 1.0.82 fflynn@together.net (Francis Flynn) wrote: >Does anyone have a current address and phone number for Amidon Associates? >The phone number I have is 213 763 5770, it's disconnnected. Directory >assistance was no help either. >If they are gone, does anyone have a good source of toroids? I had some correspondence with ARRL's Technical Information Service last August, and they suggested the following as a source for toroids: Ocean State Electronics 6 Industrial Drive Westerny, RI 02891 (401) 596-3080 Hope this helps. -- Joe Fishbein jmf@visi.com From lwbyppp@epix.net Wed Jan 17 14:39:59 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!reeve.research.aa.wl.com!decwrl!pacbell.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: kogletre@kings.kings.k12.CA.US (Kent Ogletree) Newsgroups: rec.radio.amateur.homebrew Subject: Amidon? Date: 13 Jan 96 08:14:39 GMT Organization: ucsd usenet gateway Lines: 27 Message-ID: References: <199601130606.WAA19934@mail.ucsd.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu jeffd@coriolis.com (Jeff Duntemann) wrote: *fflynn@together.net (Francis Flynn) wrote: *>Does anyone have a current address and phone number for Amidon Associates? *>The phone number I have is 213 763 5770, it's disconnnected. Directory *>assistance was no help either. *>If they are gone, does anyone have a good source of toroids? *I've bought a lot of toroids from Johnson Shop Products, which I *believe is in Cupertino. I don't have the phone or address here at *the office, but he should be in the phone book. Amidon has moved to new digs, the address is: Amidon, Inc 3122 Alpine Avenue Santa Ana, CA 92704 Voice: (714) 850-4660 FAX: (715) 850-1163 73, Kent - KD6NHP From lwbyppp@epix.net Wed Jan 17 14:40:01 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newshost.ndhm.gtegsc.com!gtewd.mtv.gtegsc.com!agate!sunsite.doc.ic.ac.uk!demon!tank.news.pipex.net!pipex!newsfeed.internetmci.com!globe.indirect.com!usenet Newsgroups: rec.radio.amateur.homebrew Subject: Re: Amidon? Message-ID: <4d6th4$alv@globe.indirect.com> From: jeffd@coriolis.com (Jeff Duntemann) Date: Sat, 13 Jan 1996 00:12:58 GMT References: <4d3bq3$8bm@bristlecone.together.net> Organization: The Coriolis Group, Inc. NNTP-Posting-Host: s168.phxslip4.indirect.com X-Newsreader: Forte Free Agent v0.55 Lines: 18 fflynn@together.net (Francis Flynn) wrote: >Does anyone have a current address and phone number for Amidon Associates? >The phone number I have is 213 763 5770, it's disconnnected. Directory >assistance was no help either. >If they are gone, does anyone have a good source of toroids? I've bought a lot of toroids from Johnson Shop Products, which I believe is in Cupertino. I don't have the phone or address here at the office, but he should be in the phone book. --73-- --JD-- From lwbyppp@epix.net Wed Jan 17 14:40:02 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: guenter.koellner@oen.siemens.DE (Koellner, Guenter) Newsgroups: rec.radio.amateur.homebrew Subject: AW: Re: Baycom modem Date: 12 Jan 96 21:00:00 GMT Organization: ucsd usenet gateway Lines: 72 Message-ID: <30F6CDE1@SmtpGate.Oen1.Oen.Siemens.De> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu hello folks, since some time I follow the discussion about baycom e.g. As I am a little competent about baycom let me drop a few words: Regarding hardware: Do you know about the existing baycom plug-in-card? It is call USCC (User-SCC, SCC stands for the Z8530 beeing used). The card has two SCCs, so four ports. One port is a AM7910 modem for HF/VHF, one a TCM3105 for VHF, a DF9IC style 9600bd FSK modem and a straight forward port. It completly adapts to baycom user software, to the baycom node and the baycom mailbox. There is also a RMNC/Flexnet following software called PC/Flexnet as baycom node will no longer be serviced. There is also a card available which has eight ports (four SCCs) but without modems. Regarding software: Baycom L2.EXE offers possibilities to transmit the AX.25 over many kinds of interfaces: Best known is the RS232 modem with the TCM3105. But there are many others: You can use the RS232 also as interface to a kiss server, e.g. TNC2. As mentioned above the USCC card. There is also a IPX interface which runs over a installed network, worth which transmission type (e.g. ARCNET or Ethernet, you just need IPX) I have a baycom mailbox running which provides also network services using Novell Netware Lite, as I use a L2.EXE which also offers IPX support I can connect the mailbox via the network, too. PC/Flexnet, which will soon replace baycom's L2.EXE, also offers the support for IPX as far as I currently know. This is for your information. If you need more, please be shure to send a private copy for mee, too, as i do not always carefully watch the tcpip and packet radio groups. vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU (AX.25) DL4MEA@AMSAT.ORG (Internet) HTTP://WWW.SCN.DE/~KOELLNER (WWW) ---------- | Von: mwestfal | An: tcp-group | Betreff: Re: Baycom modem | Datum: Donnerstag, 11. Januar 1996 15:13 | | In a former treatise, Dennis Rosenauer spake thusly: | | -> Perhaps the Baycom could be subject to the same fate as a 3C501 Ethernet | -> card. That is smashed with a large hammer. :-) | | | "Could" be...? You mean SHOULD be.... | | | ---------------------------------------------------------------------------- --- | - | 73 de Mike, ax.25net: N6KUY@W6JBT.#SOCA.CA.USA.NOAM | amprnet: n6kuy@n6kuy.ampr.org [44.18.0.49] | internet: mwestfal@.csci.csusb.edu | web: http://orion.csci.csusb.edu:8080 | Linux: the Gates of Hell shall not prevail. | GCS/M { -d+ p+ c++ l u++ e+(*) m++(-) s/+ !n-(---) h-- !f g+ w+ t++ r-(--) y+ | } | ---------------------------------------------------------------------------- --- | - | From lwbyppp@epix.net Wed Jan 17 14:40:03 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: BFO Project Questions ????? Date: Fri, 12 Jan 96 08:07:10 PDT Organization: Northwest Nexus Inc. Lines: 60 Message-ID: References: <4d1rnv$81i@news1.netzone.com> NNTP-Posting-Host: blv-pm2-ip2.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage In article <4d1rnv$81i@news1.netzone.com>, ---snip > to get me to do. How would I use a receiver to do this? What is a GDO? > What is "zero-beats"? > > Answers to the above questions, as well as any general advice would be > greatly appreciated. > > Thanks in advance for helping a new ham, > > Brian > KC7JRT > Well, Brian, you may have a fun time of it. First, question... Yes the IF transformers will look like little metal cubes with a hole in them and a gray or black ferrite core inside that can be adjusted. The core is in the middle of a coil of wire and adjusts the inductance of it to tune the transformer. Some cores have a screwdriver slot and others have a hex shaped hole. I'm not sure why there would be seven if its just an AM only radio. I would only expect 4 or 5. They are not all identical, and are color coded for function, and or frequency. If the radio is an AM/FM radio then some of the transformers you see are probably for 10.7MHz instead of 455KHz. (usually FM receivers use 10.7MHz for IF, and AM uses 455KHz). For your case, I would expect that any of the 455KHz transformers should work in your application. The difference between the various 455KHz transformers is in the turns ratio and taps to couple into the next stage. I expect that the circuit that you are building only uses the primary winding on the transformer; so you may have to figure out which pins to use. You could use an ohm meter to determine which pins are part of the same coil of wire. As for the "beat". If you build up the circuit and connect it to a radio and then tune in an AM radio station; then when you turn on the BFO circuit you should hear a loud squeal (at least you will if the bfo is near the 455KHz if of your working radio). Then as you tune the bfo by turning the adjustment screw the squeal will move up or down in frequency. The squeal is the "beat" frequency - the difference in frequency between the bfo oscillator frequency and the radio's IF frequency. You want to adjust the bfo frequency until the beat frequency approaches zero (the squeal gets lower and lower until it disappears - if you keep tuning then it starts getting higher and higher again). The GDO is a Grid Dip Oscillator, which is a general purpose test instrument that can be used to check the resonant frequency of coils and circuits. Actually they aren't near as common as they were 20 years ago. Hope that helps...you will probably get some more hints from others....Jay (KI7RH) From lwbyppp@epix.net Wed Jan 17 14:40:04 1996 Path: news.epix.net!news.sprintlink.net!bristlecone.together.net!usenet From: Francis Flynn Newsgroups: rec.radio.amateur.homebrew Subject: Re: BFO Project Questions ????? Date: 17 Jan 1996 03:44:02 GMT Organization: TGF Internet Services Lines: 13 Message-ID: <4dhra2$84n@bristlecone.together.net> References: <4d1rnv$81i@news1.netzone.com> NNTP-Posting-Host: vtr144.ramp.together.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Generally, yellow is used to mark the 455khz IF Xformers, black is the IF output and red is the local oscillator. I used to work in a consumer electronics repair shop and this is how most japanese comsumer type receivers are. Every manufacturer can do as they please, so, take this advice with that grain of salt. One can also deduce the function of a transformer or coil by looking at it's position in the radio's circuit. If it looks like an intermediate stage, as in there are some circuits before and after it, then you most likely have an IF transformer. In most cheap radios there is bound to be an IF transformer somewhere, if the one you find at first doesn't work, try some others. Fran KM1Z From lwbyppp@epix.net Wed Jan 17 14:40:06 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!kaiwan.kaiwan.com!not-for-mail From: alf@kaiwan.com (Alfred Lee) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Circut req'd - telephone line in use indicator. Date: 15 Jan 1996 20:25:22 -0800 Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338) Lines: 25 Sender: alf@kaiwan009.kaiwan.com Message-ID: References: NNTP-Posting-Host: kaiwan009.kaiwan.com In article , ai657@freenet.toronto.on.ca (Paul Egan) wrote: > > I know it is a litle off topic but here goes. I need a circut diagram for a > "telephone line in use indicator". We have three modems on a single > telephone line here > and we are constantly cutting each other off. I guess it would have an > LED to indicate > line usage and would be plugged into the phone jack of our modems. I have > heard that > manufactured units exist but can't seem to find them here in Toronto. > Any help would be most appreciated. > Please e-mail. Thanks. > Paul Egan VE3GFY At least here in the US the easiest thing is to hook a volt meter to measure the voltage. It should be around 48 V when no one is on line and drop to < 10 V if the phone was in use. That what I do at the office. 73, --- Alfred Lee alf@kaiwan.co m KE6KGV 'The answer is (e^iã + 1) ? "No" : "Yes"' From lwbyppp@epix.net Wed Jan 17 14:40:06 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!overload.lbl.gov!news.emf.net!gatech!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail From: pcarter@freenet.columbus.oh.us (Philip Carter) Newsgroups: rec.radio.amateur.homebrew Subject: Commercial License Exams, Columbus OH Date: 13 Jan 1996 16:56:16 -0500 Organization: The Greater Columbus FreeNet Lines: 6 Message-ID: <4d99q0$sl6@acme.freenet.columbus.oh.us> NNTP-Posting-Host: acme.freenet.columbus.oh.us Keywords: GROL GMDSS RADAR 2T Commercial radio exams X-Newsreader: TIN [version 1.2 PL2] Commercial radio exams will be held in Columbus, Ohio January 20, 1996. For more information or to register, call 614-240-0059. -- pcarter@freenet.columbus.oh.us Philip L. Carter, WD8QWR wd8qwr@w8cqk.#cmh.oh.usa.na From lwbyppp@epix.net Wed Jan 17 14:40:07 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!skypoint.com!usenet From: Bill Risch Newsgroups: rec.radio.amateur.homebrew Subject: Convert UHF Micor to Ham Bands and 9K6 Date: 14 Jan 1996 15:22:18 GMT Organization: SkyPoint Communications, Inc. Lines: 6 Message-ID: <4db73a$61d@stratus.skypoint.net> NNTP-Posting-Host: dial012.skypoint.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1PE (Windows; I; 16bit) I need info on how to convert UHF Micors to the 440 ham band. I also need related info on converting to run 9K6. I saw a post not too long ago but I failed to keep in and lost the name of the party that had the info. Thanks in advance, Bill K0MVH brisch@skypoint.com From lwbyppp@epix.net Wed Jan 17 14:40:08 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: re:copyleft Date: 12 Jan 96 19:19:19 GMT Organization: ucsd usenet gateway Lines: 11 Message-ID: <9600128214.AA821481831@mails.imed.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Doug Faunt correctly caught my error in suggesting using "copyleft". If I remember correctly the "copyleft" of the FSF allows for commercial use, so the authors would have to morph it into a limited use license of their copyright. This would allow unlimited personal use, no commercial use, and require personal users to give back to the group. Do y'all think this would work? Ray Mack WD5IFS mack@mails.imed.com From lwbyppp@epix.net Wed Jan 17 14:40:09 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.corpcomm.net!news.pe.net!norconnect.no!news.ece.uc.edu!babbage.ece.uc.edu!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom2!faunt From: faunt@netcom2.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Subject: Re: re:copyleft In-Reply-To: mack@mails.imed.COM's message of 12 Jan 96 19:19:19 GMT Message-ID: Sender: faunt@netcom2.netcom.com Organization: at home, in Oakland References: <9600128214.AA821481831@mails.imed.com> Date: Sat, 13 Jan 1996 02:55:05 GMT Lines: 13 I believe Phil Karn has just this sort of protection on the KA9Q package. It's a much more vulnerable product, and I don't know how it's working for him. The more I learn about the 68HC11, the more frustrated I am about this. As near as I can figure, the antenna tuner could be its own developement system, with the addition of a pair of RS-232 converters, and software to run on a PC or Mac that's available as freeware. No EPROM programmer or eraser required. I'm still learning. I've been getting packages from Motorola on a daily basis, although that's slowing down. 73, doug From lwbyppp@epix.net Wed Jan 17 14:40:10 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.bc.net!rover.ucs.ualberta.ca!tribune.usask.ca!canopus.cc.umanitoba.ca!newsflash.concordia.ca!news.nstn.ca!news.cs.indiana.edu!umn.edu!skypoint.com!usenet From: Bill Risch Newsgroups: rec.radio.amateur.homebrew Subject: Re: Cushman Service Monitor Frequecy Expansion [cush.txt] (1/1) Date: 14 Jan 1996 00:59:14 GMT Organization: SkyPoint Communications, Inc. Lines: 4 Message-ID: <4d9kh2$qbr@stratus.skypoint.net> References: <4d7dt4$3qt@dobie.loop.com> NNTP-Posting-Host: dial033.skypoint.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1PE (Windows; I; 16bit) To: WB6HRO What did you use to zip this file? I can't seem to get unpacked with any of the utilities I have. Pkzip and the like. thanks in advance, Bill From lwbyppp@epix.net Wed Jan 17 14:40:12 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.nd.edu!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!dobie.loop.com!news From: WB6HRO Newsgroups: rec.radio.amateur.homebrew Subject: Cushman Service Monitor Frequecy Expansion [cush.txt] (1/1) Date: 13 Jan 1996 04:53:56 GMT Organization: The Loop Lines: 60 Distribution: world Message-ID: <4d7dt4$3qt@dobie.loop.com> NNTP-Posting-Host: pma104.loop.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) begin 644 CUSH.TXT M#0H-"E1H92!G2!R86YG92P@8G5T(&ET('=I;&P@ M<')O8F%B;'D@8V]S="!M;W)E#0IT:&%N('EO=7(@:&]U2!O=VX@82!#=7-H;6%N($-%+38@2!L:6UI="!O9B`Q,#`P M($U(6BP@:70@8F5C86UE(&9R=7-T2!T86MI;F<@=&AE('-U;2!O9B!T:&4@9G)E<75E;F-I97,N#0H-"D%S M(&ET('1U2P@=7-I;F<@=&AE(&EN=&5R;F%L($-U2!-:7AE0T*;6EG:'0@:&%V M92!A(')E=&ER960@=6YI="!O;B!A('-H96QF+@T*475E2!H86YD;&5S('-E References: <4d3541$nej@olivea.ATC.Olivetti.Com> <1996Jan12.171333.1@ttd.teradyne.com> NNTP-Posting-Host: ip-vanc2-05.teleport.com X-Newsreader: News Xpress Version 1.0 Beta #4 Xref: news.epix.net rec.radio.amateur.misc:96907 rec.radio.amateur.homebrew:12709 In article <1996Jan12.171333.1@ttd.teradyne.com>, rice@ttd.teradyne.com (John Rice) wrote: >In article <4d3541$nej@olivea.ATC.Olivetti.Com>, archive@flash.ATC.Olivetti.Com (DCG Mktg Docmnt (Ivrea)) writes: >> >> I have an electronic flash unit purchased in 1970. After being unused for >> many years, I find that now it does not function correctly. The lamp is >> powered by 250 Vcc and the flash is triggered by a pulse. I have >> checked the capacitor, which is in good condition. Has the lamp failed >> through again?? Does anybody have the answer? I've had trouble with the trigger transformer in several (cheap) flash units. Tthe transformer is supposed to develop an 1-2 kv pulse. I think the failure mode is an internal short (probably between layers of the secondary). A cheap (often free) replacement can be had from your local color print processor. Those throw-away cameras have complete flash units. Often, you can get a couple of cameras just for the asking. The trigger transformer is easy to identify. John D. Rhodes - AA7HL Vancouver, WA jrhodes@teleport.com From lwbyppp@epix.net Wed Jan 17 14:40:17 1996 Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!hookup!nntp.et.byu.edu!gatech!newsfeed.internetmci.com!newsrelay.netins.net!news.netins.net!composer.inav.net!news From: Steve Sawyers n0yvy Newsgroups: rec.radio.amateur.homebrew Subject: FS: Miniature Vaccum Relays 5KV 15A SPST Latching $20 Date: 9 Jan 1996 05:37:07 GMT Organization: Internet Navigator, Inc. Lines: 93 Message-ID: <4csuu3$482@composer.inav.net> NNTP-Posting-Host: dip49.inav.net Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) FS: Miniature Vaccum Relays 5KV 15A SPST Latching I am not sure this is appropriate for this newsgroup, but these are definitely builder’s parts and there has been a lot of discussion the QST antenna article which prompted me to buy them. New Miniature Vacuum Relays Manufacturer: Kilovac Model : K41P Contact: SPST Latching Contact Ratings: Freq Volts AMPS DC-60Hz 5,000 15 A 2.5MHz 4,500 12 A 16 MHz 3,500 8 A 32 MHz 2.800 6 A Contact Capacitance Between Open Contacts 1.2 pF Open Contacts to Ground 1.2 pF Coil Voltage: 26.5 VDC Momentary Coil Resistanc : 80 Ohms 6 ms minimum pulse Not for Continuous Duty Operate Time Max: 6 milli-seconds Shock load rating: 30 Peak G's Operating Temp.: -55 to +125 degrees C Mechanical Life: 1,000,000 Cycles Nominal Weight: 1 oz. These are approximately 1/2” in Diameter and 2” Long. They are designed for Mid body flange mounting, and mounting must be grounded. Note: There are two coils, one to open and one to close. Coils can only take a pulse, as continuous loading will fry them, but it only takes a 10 ms pulse to kick them on or off. They are used in military automatic tuning couplers. They are new in factory boxes of 42 each. I stumbled across about 1000 of these and had to buy them all to get what I wanted. So decided to sell the excess. I have about 300 of them left, but may be able to get more. Will sell any quantity. Price: $20 Each $5 Shipping and $5 COD (if applicable) per order Free shipping and COD of orders of 10 or more. I called KiloVac and they are quoting $75 each in quantity 100, Jennings has a similar part at $48 for quantity 100. Best installation is to mount thru a drilled aluminum plate to provide shielding between high voltage RF and control voltage. I am going to use them for a high power version of the QST automatic antenna tuner. Will need to beef the coils and caps, but the micro processor won't care. It does take a circuit mod to drive two coils on the transition rather than one via level, and the sensor needs to be redesigned. Am also going to use for tower mounted switch boxes using a 3 to 8 decoder and a little driver logic. I am sure other people have other ideas. Steve Sawyers (n0yvy) sawyers@inav.net 1822 Somerset Drive Marion IA 52302 evening phone(CST): (319) 377-2877 From lwbyppp@epix.net Wed Jan 17 14:40:18 1996 Path: news.epix.net!news.sprintlink.net!news.oz.net!news.wwa.com!news From: {Gary} KF9CM turtle@wwa.com Newsgroups: rec.radio.amateur.homebrew Subject: FS: Vhf High Power Duplexer Date: 13 Jan 1996 02:14:01 GMT Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com) Lines: 26 Message-ID: <4d74h9$gsp@kirin.wwa.com> NNTP-Posting-Host: vh1-035.wwa.com X-Newsreader: AIR News 3.X (SPRY, Inc.) I have for sale a Sinclair 4 cavity high power VHF duplexer Model# Q-202GC. T o my knowledge it's never been used. The cavities are inclosed in a steel cabnet w ith (3) three conectors on the side. The frequency tuning range is from 132 to 17 4 Mhz and I have the complete tuning manual. The Electrical Specifications are as follows: INSERTION LOSS= Tx 1.5 db Rx 1.5 db ISOLATION, Tx Noise at Rx frequency = 80 db Tx Frequency at Rx Terminal = 80db MINIMUM ISOLATION Between Tx and Rx Frequencies = 50db MINIMUM SEPARATION = 500Khz This is a top of the line duplexer and lists from Sinclair for $1730.... I wil l take $850 or best offer. This is for local pickup or I can deliver within a 100 mile rad ius of Chicago Il. You can "E" mail me at turtle@wwa.com From lwbyppp@epix.net Wed Jan 17 14:40:19 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!cornellcs!rochester!news.csug.rochester.edu!rit!sunsrvr6!jdc From: jdc@cci.com (James D. Cronin) Subject: Re: Funky bias setup in VHF linear amps? Message-ID: Sender: root@sunsrvr6.cci.com (Operator) Organization: Northern Telecom, Network Application Systems References: <4ctkjp$pop@newsbf02.news.aol.com> Date: Mon, 15 Jan 1996 18:03:24 GMT Lines: 35 Mystery solved: While perusing ATV Quarterly, I saw a couple of notes on power amps. The network in question is used to suppress low frequency oscillation. 73..Jim N2VNO In article <4ctkjp$pop@newsbf02.news.aol.com>, W8JI Tom wrote: >Hi Jim, >In article , jdc@cci.com (James D. Cronin) >writes: >>The schematic for a Mirage 2-meter linear amp shows a bias arrangement >>that looks peculiar. >>There is the usual rectifier diode from transistor base to ground >>with a fixed resistor and trimmer potentiometer in parallel. This part >>looks normal. >>What was odd was the bias supply: Instead of being fed by a DC voltage >>it was connected to the transistors collector through (here's the wierd >>part) a series resistor, capacitor and choke. > >Don't depend on the schematic to be absolutely correct. What Mirage amp is >it? I'll look at one and tell you how the circuit works. > >73 Tom > > >> >>How is this supposed to work? Are they siphoning off some of the output >>signal and letting the parallel diode rectify it? >> >>73..Jim N2VNO > From lwbyppp@epix.net Wed Jan 17 14:40:20 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!milano!news-relay.us.dell.com!swrinde!elroy.jpl.nasa.gov!llyene!news From: Bob.Zander@jpl.nasa.gov (Bob Zander) Subject: Grapefruit powered XMTR? Message-ID: <1996Jan16.194742.28225@llyene.jpl.nasa.gov> Sender: news@llyene.jpl.nasa.gov Organization: JPL X-Newsreader: WinVN 0.92.2 Date: Tue, 16 Jan 1996 19:47:42 GMT Lines: 11 Hi all... I remember as a school project my Grandfather and I built a XMTR that was powered by a penny and a quarter inserted into a grapefruit. Well, my son needs such a project for school and my Grandfather is no longer with us. Can some kind person point me in a direction where I might find plans for this XMTR? Thanks and 73 Bob KE6ZUF From lwbyppp@epix.net Wed Jan 17 14:40:21 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!milano!news-relay.us.dell.com!swrinde!elroy.jpl.nasa.gov!llyene!news From: Bob.Zander@jpl.nasa.gov (Bob Zander) Subject: Grapefruit powered XMTR? Message-ID: <1996Jan16.200331.28565@llyene.jpl.nasa.gov> Sender: news@llyene.jpl.nasa.gov Organization: JPL X-Newsreader: WinVN 0.92.2 Date: Tue, 16 Jan 1996 20:03:31 GMT Lines: 12 Hi all... I remember as a school project my Grandfather and I built a XMTR that was powered by a penny and a quarter inserted into a grapefruit. Well, my son needs such a project for school and my Grandfather is no longer with us. Can some kind person point me in a direction where I might find plans for this XMTR? Thanks and 73 Bob KE6ZUF From lwbyppp@epix.net Wed Jan 17 14:40:22 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.voicenet.com!uunet!in2.uu.net!newsfeed.internetmci.com!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Ham Gods and Spectrum Analyzers (Was interesti Message-ID: <1996Jan11.173249.24884@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <1996Jan8.145012.9602@ke4zv.atl.ga.us> <8213108211903@lss.humnet.humberc.on.ca> Date: Thu, 11 Jan 1996 17:32:49 GMT Lines: 33 In article <8213108211903@lss.humnet.humberc.on.ca> hduff@humnet.humberc.on.ca (Hugh Duff) writes: > >> In article <4coc5i$kpq@newsbf02.news.aol.com> lrware@aol.com (Lrware) write s: >>>Bravo! Do we have an ex spectrum analyzer designer among us? >> >> No, just a spectrum analyzer user, and sometimes repairman. >> >> Gary >> >> Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gar y > > >Gary...Just wondering if you are getting your e-mail ? >I sent you 2 messages within the past few weeks. >Zack Lau tells me that you were messing with a 222 MHz TX strip design. >I'm working on something similar...wondering if you care to share >info ? Hugh, my upstream smart host has been snarfed for nearly a month. I've finally got news posting working through it again, but Email is iffy. If you don't get a reply through the regular route, I've setup another mail drop. Try ke4zv@radio.org. I'm working on a transverter, but I don't think that applies to what you're doing. It's just your typical DBMs and crystal oscillator type of thing. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:40:23 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: EFBRYA@acxiom.COM Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ham-Homebrew Digest V96 #1 Date: 12 Jan 96 13:48:33 GMT Organization: ucsd usenet gateway Lines: 28 Message-ID: <0f666890@acxiom.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu >Ed Hare : > >I have been somewhat surprised to see some of the turns this thread >has >taken. I have seen a few posts that seem to imply that because QST >*occasionally* has run an article that doesn't offer source code, >that >*none* of our articles are complete. In reality, over the past three >years, QST has, if memory serves, offered two articles that didn't >include source code. FWIW, those two have proved to be among the >most >popular construction projects, based on the semi-formal counts we >always >get from the authors. I think that tells me that we have chosen the >exceptions to our informal "rules" wisely. (We *do* encourage all >authors >to make source code available, and will continue to do so. We have >even >changed a few minds along the way.) Not to take a cheap shot but couldn't the high number of responses be because the source was not printed? The authors have to be contacted to build the project. This would seem to be an indication of the number who DO want to program their own chips but couldn't because the source was not there! Eric Bryan KC5EBY From lwbyppp@epix.net Wed Jan 17 14:40:24 1996 Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help HP8654A sig.gen transistor substitute Date: 9 Jan 1996 04:42:11 GMT Organization: Hewlett-Packard Lines: 17 Message-ID: <4csrn3$lk5@hpscit.sc.hp.com> References: <199601082036.GAA17472@dyson.brisnet.org.au> NNTP-Posting-Host: hpscrj.scd.hp.com In article <199601082036.GAA17472@dyson.brisnet.org.au>, Peter L. Williamson wrote: >Hi, I am repairing a friend's HP8654A signal generator which has had a dose >of RF "up the tail". I have repaired the attenuator but it has two shot >transistors in the output amplifier, Q6 and Q7. These are numbered "35824A" >and according to local HP are part # 18-54-0696. Does anyone in this group >have a cross reference to a "real" transistor, eg Motorola Philips NS etc? >The HP spares are difficult to get and a dynamite price, too much for >experimenters pockets!. Any help appreciated. >Peter VK4AWP. 1854-0696 is a Philips BFQ22S, 4.2 GHz. F-sub-t at 30 mA. Hope that helps. Rick Karlquist, N6RK rkarlqu@scd.hp.com Hewlett-Packard Santa Clara Division From lwbyppp@epix.net Wed Jan 17 14:40:27 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!ub!news.kei.com!newsfeed.internetmci.com!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Help With MOV's Message-ID: <1996Jan13.104606.4572@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4d5d0k$8vm@newsbf02.news.aol.com> <4d7lvt$cea@newsbf02.news.aol.com> Date: Sat, 13 Jan 1996 10:46:06 GMT Lines: 73 In article <4d7lvt$cea@newsbf02.news.aol.com> w8jitom@aol.com (W8JI Tom) writ es: > >The on resistance between 6 and 20 ohms is about worthless across a power >line, unless the transient is pretty puny or comes from a high impedance >source. If the transcient is that frail, the transformer can handle it >fine. If the transient comes from a "stiff" or low impedance (high >current) source, the MOV has too high an impedance. The equipment is >history anyway! > >I'm not saying MOV's are usless in all applications. They are great in >some applications, such as telephone lines (where the goal is to protect >the customer or house). They can certainly help protect line operated >transformerless supplies, and can reduce the chance of arcing from >extremely high common mode voltages between the line and chassis. MOV's >just don't do much to help things on the secondary side of a transformer. >A six ohm clamp isn't what I would consider particularly "hard" compared >to the impedance of a 20 amp 120 volt supply line. You didn't read what I wrote, Tom. During the IEEE 8/20 transient, the MOV has an effective "on" resistance of 6.15e-6 ohm, that's *not* 6 ohms, that's 6 *millionths* of an ohm. This is dynamic behavior, of course, and only lasts for the 20 microseconds of the transient waveform. If the transient persists, steady state "on" resistance is around 20 ohms, but the device will self- destruct under that condition. MOVs certainly do work to protect transformer powered equipment, as the blown MOVs in my Astron supply attest. They gave their lives clamping the lightning transient, and the power supply survived. On reflection, MOVs of greater than 60 joule surge rating should have been in there. They wouldn't have died while doing their duty. You might think that the transformer would swallow the transient, but it won't. The core saturation has nothing to do with it. The transient will couple through the transformer via the inter-winding capacitance and puncture electrolytic capacitor junctions and solid state device junctions if the MOV is not present. The transient is very high frequency RF. A MOV can't be modeled as just a voltage dependent resistor. Its dynamic behavior is much more complex than that. It's made up of a sintered mix of electron donor and electron receptor materials. The 60 joule device for which I quoted specs has the ability to "eat" 3/4 of a coulomb of charge, and leak it away gradually and safely after the event. The best model for a MOV is that of a paralleled RC snubber, but that doesn't accurately portray the complete device physics either. Once the charge is "swallowed" it can't get out either way without going through the high "off" resistance of the device. Let me try a crude description of how a MOV works. Inside the MOV, picture a bunch of capacitor plates separated by insulating material. Initially, the "capacitors" have a neutral charge, and the insulation value is high enough to prevent sensible current flow. During a transient, the insulation breaks down, a non-destructive (if within device joule ratings) arc forms which rapidly charges the capacitor plates. This distributes charge throughout the device. The potential between one "capacitor" and another is small enough that the insulation doesn't break down, and the current can't get back out except by very slow leakage. It "eats" charge, up to 3/4 coulomb of it for the device I described. It can't do that indefinitely, of course, which is why it can only handle a transient of limited duration. Longer duration overvoltages will make the insulation arcing destructive rather than non-destructive and the device becomes conductive and destroys itself. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:40:28 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet From: QRP%mimi@magic.itg.ti.com (D W Hemphill KC5NG) Newsgroups: rec.radio.amateur.homebrew Subject: Re: How make a (T/R Swich) ??? Date: 15 Jan 1996 16:31:29 GMT Lines: 2 Message-ID: <4ddvh1$mbq@mksrv1.dseg.ti.com> References: <4cvgot$8p6@news.worldlinx.com> NNTP-Posting-Host: dhemphill.dseg.ti.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 The TH-78A is a 2m / 440 dual band handie-talkie. From lwbyppp@epix.net Wed Jan 17 14:40:29 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!cornellcs!rochester!rocksanne!news From: butte.wbst129@xerox.com Subject: How to add battery capacity to a vehicle? Content-Type: TEXT/PLAIN; charset=US-ASCII Message-ID: Lines: 30 Sender: news@news.wrc.xerox.com Organization: Xerox X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage Mime-Version: 1.0 Date: Mon, 15 Jan 1996 16:11:33 GMT I am interested in increasing the battery capacity in my pick up truck to permit it to run equipment for a longer period of time without the engine running. Specifically, I would like to be able to leave my remote controllable dual band rig on as a cross band repeater without coming back to a dead battery. I've considered the following options, but would like comment, feedback and suggestions. 1. Install a deep-cycle (e.g. marine) battery in place of the existing one. Would select one that fit in the available space and still had the "cold-cranking amps" rating of the existing one. 2. Install a second conventional battery in parallel with the existing one. Don't know what kind of balancing might have to be done here. 3. Install a second battery with a manual switch. High Current switch=$$?. Would it have to be at the battery instead of near the dashboard? 4. Power the rig from a separate lead-acid or gel-cell with trickle charger powered by an ignition-switched circuit. (I already have gel cells with about 20 amp-hours of capacity) Don't know how to construct this circuit to limit current if battery were discharged. (Yeah, I'm ignorant, but learning...) Thoughts anyone? Regards, Paul KB2TCG From lwbyppp@epix.net Wed Jan 17 14:40:29 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!ix.netcom.com!netnews From: Dan Davis Newsgroups: rec.radio.amateur.homebrew Subject: HR2510 Date: Fri, 12 Jan 1996 19:00:50 -0800 Organization: Netcom Lines: 4 Message-ID: <30F72062.7D2B@ix.netcom.com> NNTP-Posting-Host: irv-ca14-20.ix.netcom.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-NETCOM-Date: Fri Jan 12 7:01:02 PM PST 1996 X-Mailer: Mozilla 2.0b5 (Win16; I) need info about power mod and info on varible drive.send in to dan110@ix.netcom.com Thanks Dan Davis KD6UWC From lwbyppp@epix.net Wed Jan 17 14:40:30 1996 Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.asu.edu!news.eas.asu.edu!gatech!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom12!faunt From: faunt@netcom12.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Subject: Information on 74C945 and 74C947 Message-ID: Sender: faunt@netcom12.netcom.com Organization: at home, in Oakland Date: Sat, 13 Jan 1996 18:47:47 GMT Lines: 4 Xref: news.epix.net sci.electronics.components:1240 rec.radio.amateur.homebrew:12699 Is there any place on the net I can get information about these two IC's? If not on the net, another good source of information? Thanks, and 73, doug From lwbyppp@epix.net Wed Jan 17 14:40:32 1996 Path: news.epix.net!news.sprintlink.net!netnews.fast.net!news.fast.net!news.pgh.net!newsfeed.pitt.edu!gatech!newsfeed.internetmci.com!solaris.cc.vt.edu!news.new-york.net!earth.njcc.com!usenet From: ahusik@pluto.njcc.com (Adam Husik) Newsgroups: rec.radio.amateur.homebrew Subject: Kenwood TH79 Faster Scan Rate Date: Wed, 10 Jan 1996 04:28:06 GMT Organization: New Jersey Computer Connection, Lawrenceville, NJ Lines: 14 Message-ID: <4cv7od$f6v@earth.njcc.com> NNTP-Posting-Host: husik.njcc.com X-Newsreader: Forte Free Agent 1.0.82 The removal of diode modification certainly extends the TX/RX capabilities of the radio, however, I think the unit scans at a slow rate. Has anyone discovered a way (via swapping a part or other) which will change the rate? I will probaly end up calling Grove's to see if they know of a way to solve the problem, however, I wanted to ask here first. Thanks, Adam Husik KB2UTP From lwbyppp@epix.net Wed Jan 17 14:40:32 1996 Path: news.epix.net!news.sprintlink.net!newsat!engineer.mrg.uswest.com!news.uoregon.edu!hpg30a.csc.cuhk.hk!news.cuhk.edu.hk!agate!howland.reston.ans.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.sas.ab.ca!fn1.freenet.edmonton.ab.ca!morganp From: morganp@fn1.freenet.edmonton.ab.ca () Newsgroups: rec.radio.amateur.homebrew Subject: Kit for E-prom burner? Date: 12 Jan 1996 04:34:07 GMT Organization: Edmonton Freenet, Edmonton, Alberta, Canada Lines: 8 Message-ID: <4d4obv$ai5@news.sas.ab.ca> NNTP-Posting-Host: fn1.freenet.edmonton.ab.ca X-Newsreader: TIN [version 1.2 PL2.3] Is there a kit out there for an E-prom burner? Thanx in advance. -- 73 & ttyl Morgan Patterson \\/// Internet: morganp@freenet.edmonton.ab.ca (o o) Ham Radio: VE6MRP (_) "What, back up my hard drive! I can't find the reverse switch" ----oOO-----OOo--------------------------------------------------------------- From lwbyppp@epix.net Wed Jan 17 14:40:34 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: lofer transmitter Message-ID: <1996Jan16.200959.22962@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4devhq$o3i@news.rrz.uni-koeln.de> Date: Tue, 16 Jan 1996 20:09:59 GMT Lines: 24 In article <4devhq$o3i@news.rrz.uni-koeln.de> a2274990@athena.rrz.uni-koeln.de (Thilo Kootz) writes: >hi hams ! >i understand in usa there are longwave experimental frequencys. i >would be interested in transmitting proposals. >maybe using an audio amplifier ? >does anyone have idears also about the antenna matching ? >greetings, thilo dl9kce In the USA there is the Lowfer "experimental band" from 160 kHz to 190 kHz, 1 watt, maximum 50 foot antenna (and feedline if used), no license required. There is a fairly large and active group here. Also in the USA, no license is needed for operation below 8 kHz. I don't know of any real radio activity by experimenters down at ELF, but there is some activity with "Earth Radio", which is really just a sheet resistance method of sending signals. Performance can be surprisingly good if you can deal with the power line currents, IE *horrible* hum. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:40:35 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: lofer transmitter Date: Tue, 16 Jan 1996 16:51:34 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 29 Message-ID: References: <4dg7m4$f2i@news.rrz.uni-koeln.de> <4dh6in$dih@mirrors.cellnet.com> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4dh6in$dih@mirrors.cellnet.com> I think Jim, that you mean ten meters rather than ten feet for antenna length. Usually in the USA we refer to the antenna as fifty feet in total length including the top hat. LOWFER's are experimenters in the 160 to 190 KHz range. Lots of good work is being done in that region under some horrible conditions usually by hams but not necessarily so! Cliff Buttschardt W6HDO On 16 Jan 1996, Jim wrote: > This band is between 160 and 190 kHz. There have been quite a number of art icles > over the years on various construction projects. The law granting authority to use > this band limits power to one watt and antenna size to 10 feet. This size l imit > makes for some heavily loaded antennas! > > Jim, WU0I > > > a2274990@athena.rrz.uni-koeln.de (Thilo Kootz) wrote: > >hi hams ! > >i understand in usa there are longwave experimental frequencys. i > >would be interested in transmitting proposals. > >maybe using an audio amplifier ? > >does anyone have idears also about the antenna matching ? > >greetings, thilo dl9kce > > > > > > From lwbyppp@epix.net Wed Jan 17 14:40:36 1996 Path: news.epix.net!news.sprintlink.net!cheatum.frontiernet.net!Empire.Net!news.net99.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: n1ddzrjc@aol.com (N1DDZ RJC) Newsgroups: rec.radio.amateur.homebrew Subject: Looking for scope camera back Date: 15 Jan 1996 22:00:36 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 10 Sender: root@newsbf02.news.aol.com Message-ID: <4df4ck$g55@newsbf02.news.aol.com> Reply-To: n1ddzrjc@aol.com (N1DDZ RJC) NNTP-Posting-Host: newsbf02.mail.aol.com I used to see old scope cameras at Deerfield that had 4X5 "graflok" backs in them. There is a 4" X 5" opening and sometimes there is a ground glass in there. I really just need the frame - the whole shebang would be good too. Anyone got one kicking around? Bob Crowley, Staff Inventor AMBIT Corporation, Sudbury MA From lwbyppp@epix.net Wed Jan 17 14:40:37 1996 Path: news.epix.net!news.sprintlink.net!mhv.net!news.westnet.com!stevens-tech.edu!newsserver.jvnc.net!newsserver2.jvnc.net!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!amber1.ultranet.com!user From: acj@ultranet.com (Jon Goguen) Newsgroups: rec.radio.amateur.homebrew Subject: Low noise pre-amp for 900 MHz Date: 12 Jan 1996 01:19:47 GMT Organization: UltraNet Communications, Inc. Lines: 6 Message-ID: NNTP-Posting-Host: amber1.ultranet.com X-Newsreader: Value-Added NewsWatcher 2.0b22.0+ Can anyone suggest either a commercial source or plans and component sources for the above? Thanks in advance for all replies. Jon From lwbyppp@epix.net Wed Jan 17 14:40:38 1996 Path: news.epix.net!news.sprintlink.net!rjo02.embratel.net.br!news.unisys.com.br!news.ironhorse.com!fury.berkshire.net!op.net!news.fyionline.com!news.internetMCI.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!iafrica.com!ticsa.com!cstatd.cstat.co.za!aztec.co.za!usenet From: peralex@aztec.co.za (Tom Davies) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Making PC boards from laser printer Date: Thu, 11 Jan 1996 08:43:43 GMT Organization: Peralex Electronic Development Lines: 13 Message-ID: <4d2idc$1h9@aztec.co.za> References: <4bd8a1$t1n@newsbf02.news.aol.com> <30da564f.89541169@news.solo.pipex.co.za> <4bv1to$97f@news.third-wave.com> Reply-To: peralex@aztec.co.za NNTP-Posting-Host: peralex.aztec.co.za X-Newsreader: Forte Free Agent 1.0.82 ko2e@Pko2e.capital.net wrote: >I jumped in the group late and missed the original posting. Whats the story >about laser print / circuit boards. I have used Tek Film with fair results. >Please let me know... Ernie.. Use DejaNews, and search for the subject line. Tom From lwbyppp@epix.net Wed Jan 17 14:40:39 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!news.tacom.army.mil!ulowell.uml.edu!wang!news.kei.com!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!fido.asd.sgi.com!news.neu.sgi.com!eugate.sgi.com!imaginet.fr!rain.fr!world-net!usenet From: opworld@worldnet.fr Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MC1496/1596 obsolete ? Date: Sun, 14 Jan 1996 01:49:54 GMT Organization: World-Net information exchange, Internet provider. Lines: 12 Message-ID: <4d9nnl$fe8@aldebaran.sct.fr> References: <137cc$16c20.255@news.ak.net> <4ch84d$5ie@abyss.West.Sun.COM> NNTP-Posting-Host: client69.sct.fr X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net sci.electronics.components:1255 rec.radio.amateur.homebrew:12713 myers@West.Sun.COM (Dana Myers) wrote: Hi Dana, >The NE602 is very popular, with an on-board oscillator that can be >bypassed. I've heard that this chip was stopped. May I'm wrong ? Have a nice day Happy New opworld@worldnet.fr Year From lwbyppp@epix.net Wed Jan 17 14:40:40 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!demon!mail2news.demon.co.uk!lfheller.demon.co.uk From: Leon Heller Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MC1496/1596 obsolete ? Date: Sun, 14 Jan 96 13:31:38 GMT Organization: Home Lines: 13 Message-ID: <821626298snz@lfheller.demon.co.uk> References: <137cc$16c20.255@news.ak.net> <4ch84d$5ie@abyss.West.Sun.COM> <4d9nnl$fe8@aldebaran.sct.fr> Reply-To: Leon@lfheller.demon.co.uk X-NNTP-Posting-Host: lfheller.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!lfheller.demon.co.uk Xref: news.epix.net sci.electronics.components:1275 rec.radio.amateur.homebrew:12726 Elantec are advertising the EL4083C current-mode 4-quadrant multiplier which goes up to 200 MHz. It's in an 8-pin DIL package and looks quite easy to use. It should nake a good substitute for the Motorola devices. Samples are available from Elantec on (800) 333-6314 ext 311. I think that the NE602 has been replaced by the NE612. Leon -- Leon Heller, G1HSM | "Do not adjust your mind, there is E-mail leon@lfheller.demon.co.uk | a fault in reality": on a wall Phone: +44 (0)1734 266679 | many years ago in Oxford. From lwbyppp@epix.net Wed Jan 17 14:40:41 1996 Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!amber1.ultranet.com!user From: acj@ultranet.com (Jon Goguen) Newsgroups: alt.engineering.electrical,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: Modutec AC panel freq meter - available? Date: 16 Jan 1996 03:36:03 GMT Organization: UltraNet Communications, Inc. Lines: 15 Message-ID: References: <4ddq22$123k@sol.caps.maine.edu> NNTP-Posting-Host: amber1.ultranet.com X-Newsreader: Value-Added NewsWatcher 2.0b22.0+ Xref: news.epix.net alt.engineering.electrical:1497 sci.electronics.components:1323 sci.electronics.equipment:756 rec.radio.amateur.equipment:23832 rec.radio.amateur.homebrew:12760 In article <4ddq22$123k@sol.caps.maine.edu>, salomon@saturn.caps.maine.edu (Will Salomon) wrote: > I am looking for a panel meter for measuring AC line frequency for a > generator. Will: Shurite makes them. A recent H+R Rademan (1-800-848-8001) catalog lists two models with 55-65 hz range: S3-212 (2 1/2", $69.00), and S3-213 (3 1/2", $79.00). Cheers, Jon From lwbyppp@epix.net Wed Jan 17 14:40:42 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!academ!tcac!usenet From: doneal@tcac.com (Dave O'Neal) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: Re: Motorola Handie-Talkie freqs? Date: 12 Jan 1996 22:34:25 GMT Organization: TCA Communications of Texas Lines: 23 Message-ID: <4d6nlh$3pe@jupiter.tcac.com> References: NNTP-Posting-Host: lufkin-d2-port10.tcac.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 Xref: news.epix.net rec.radio.amateur.homebrew:12659 rec.radio.amateur.equipment:23668 In article , mfogarty@netcom.com says... > >A friend has a pair of Motorola HT600's. They're two channel, commercial >grade HTs. Trouble is, they don't seem to say on which frequencies they >xmt and rcv. I'd like to be able to tune in with my Standard HT. Does >anyone have this information? > >Thanks, >mfogarty That particular radio has several different models. The first three digits of the model number will tell a person which band it is on. To find the frequencies in the radio, you should look under the belt clip or remove the BACK cover and look underneath. If this does not produce a fequency list, you will need to take it to a radio shop and have the the prom read. You should know your own frequency and PL or DPL codes when you go. They can re-program the unit (probably for the same charge) at the same time (if the units are compatible). The shop I used to work at charged $35 to do this. You will probably have to go to a MOTOROLA shop to have this done. From lwbyppp@epix.net Wed Jan 17 14:40:43 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!gatech!usenet.eel.ufl.edu!psgrain!iafrica.com!ticsa.com!cstatd.cstat.co.za!aztec.co.za!workspc From: workshop@pcm.co.za (Workshop) Newsgroups: rec.radio.amateur.homebrew Subject: ne 602/612 Date: 15 Jan 1996 09:05:38 GMT Organization: Professional Computer Manufacturers Lines: 9 Message-ID: <3lau5n7$2i8_001@pcm.co.za> NNTP-Posting-Host: workspc.pcm.co.za X-Newsreader: News Xpress Version 1.0 Beta #3 Can anyone tell me if there is a site on the net where I can get application notes on the ne 602 or 612 chips.They are not in any of the data books that I have got. You can e-mail me at workshop@pcm.co.za , or post to this group. thanks Robin From lwbyppp@epix.net Wed Jan 17 14:40:44 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!mn6.swip.net!seunet!news2.swip.net!malin.foa.se!stazyr.lin.foa.se!user From: StaZyr@Lin.FOA.SE (Stan Zyra) Newsgroups: rec.radio.amateur.homebrew Subject: Re: ne 602/612 Date: 15 Jan 1996 17:39:51 GMT Organization: FOA Lines: 20 Message-ID: References: <3lau5n7$2i8_001@pcm.co.za> NNTP-Posting-Host: stazyr.lin.foa.se In article <3lau5n7$2i8_001@pcm.co.za>, workshop@pcm.co.za (Workshop) wrote: > Can anyone tell me if there is a site on the net where I can > get application notes on the ne 602 or 612 chips.They are not in any of > the data books that I have got. > > You can e-mail me at workshop@pcm.co.za , or post to this group. > thanks > Robin Well, if you can not afford to buy Philips IC17 "RF/Wireless Communications Data Handbook" take a look at: http://www.semiconductors.philips.com/ps/philips5.html#Search Although containing much information the site is only a complement to the handbook. 73 de SM7EIR Stan From lwbyppp@epix.net Wed Jan 17 14:40:45 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!mr.net!news.mr.net!uslink.net!usenet From: salinas@uslink.net (N0TTW) Newsgroups: rec.radio.amateur.homebrew Subject: Re: ne 602/612 Date: Mon, 15 Jan 1996 23:20:06 GMT Organization: For me to know. Lines: 17 Message-ID: <4dejup$7qc@link2.uslink.net> References: <3lau5n7$2i8_001@pcm.co.za> NNTP-Posting-Host: dial-114.uslink.net X-Newsreader: Forte Free Agent 1.0.82 workshop@pcm.co.za (Workshop) wrote: >Can anyone tell me if there is a site on the net where I can >get application notes on the ne 602 or 612 chips.They are not in any of >the data books that I have got. >You can e-mail me at workshop@pcm.co.za , or post to this group. >thanks >Robin Look in the ARRL handbook. My 95 has info on this chip. Chris N0TTW From lwbyppp@epix.net Wed Jan 17 14:40:46 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!yama.mcc.ac.uk!io.salford.ac.uk!ais-M1-024.salford.ac.uk!eeg132 From: eeg132@news.salford.ac.uk (A.VILCHES) Newsgroups: rec.radio.amateur.homebrew Subject: ne602 direct conv. Date: 15 Jan 1996 21:37:25 GMT Organization: University of Salford Lines: 26 Message-ID: NNTP-Posting-Host: ais-m1-024.salford.ac.uk Hi, I'm thinking of building a direct conversion Rx using the ne602 dual balanced mod. and a VCO made from shmitt logic (outputs squarewaves). The resistive load from the ne602's output will feed a high gain opamp (non- inv.) amplifier with a preset rolloff of -20db/dec and a -3db freq. of around 1 khz (i.e. any 741 set for a gain of about 1000), this in turn is followed by a small poweropamp output stage (gain of about 100). The questions I would like answered are: Can such a device detect FM as well as SSB and CW? Would the squarewave VCO cause too many harmonic problems in the mixer? Is -20db/dec sufficient to filter out any rf left at the output of the mixer? I intend to vary the frequency from about 1.5Mhz to 20MHz, any ideas on the best frequencies to monitor with such a rig? Please send any ideas / comments to my e-mail address (post also if you wish). Thanks, A.Vilches@eee.salford.ac.uk From lwbyppp@epix.net Wed Jan 17 14:40:47 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!hookup!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: rreames@ix.netcom.com(Randy Reames ) Newsgroups: rec.radio.amateur.homebrew Subject: Need 10 meter conversion info for Cobra 148gtl Date: 15 Jan 1996 18:47:40 GMT Organization: Netcom Lines: 10 Message-ID: <4de7gc$r2s@cloner3.netcom.com> NNTP-Posting-Host: ix-den11-26.ix.netcom.com X-NETCOM-Date: Mon Jan 15 10:47:44 AM PST 1996 I need some info on converting a Cobra 148gtl to the 28.3-28.5 portion of 10 meters. I've picked up some stuff about modifying the PLL (mb8719) circuit from some CB info but I'm not sure I trust it. Has anyone done this successfully? Also need to modify the RIT for both receive and xmit. Randy WA0TKO rreames@ix.netcom.com From lwbyppp@epix.net Wed Jan 17 14:40:47 1996 Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet From: wave@mindspring.com (Pieter Ibelings) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need 10 meter conversion info for Cobra 148gtl Date: 16 Jan 1996 18:48:54 GMT Organization: Mixrowave Inc. Lines: 29 Message-ID: <4dgrum$209@brickbat.mindspring.com> References: <4de7gc$r2s@cloner3.netcom.com> NNTP-Posting-Host: wave.mindspring.com Mime-Version: 1.0 X-Newsreader: WinVN 0.99.2 If remember correctly, I would float pin 10 of the MB8719 and then place a 1K pot on this pin to ground. By adjusting the pot, the pll would go thru 3 states. One is the normal state, one is a +640KHz and the other somewhere in between is +1280KHz which brings you to 28.685 on CH40. You need to readjust the VCO coil which is the one that contains wax and has red plastic until the vco oscillates at this new frequency range. Once this is done you need to retune the TX and TX coils to peak the RX and TX on the new range. 73's Hope this helps. AC4OP In article <4de7gc$r2s@cloner3.netcom.com>, rreames@ix.netcom.co says... > > > I need some info on converting a Cobra 148gtl to the 28.3-28.5 >portion of 10 meters. I've picked up some stuff about modifying the >PLL (mb8719) circuit from some CB info but I'm not sure I trust it. >Has anyone done this successfully? Also need to modify the RIT for >both receive and xmit. > >Randy >WA0TKO >rreames@ix.netcom.com From lwbyppp@epix.net Wed Jan 17 14:40:48 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!nntp.cntfl.com!usenet From: Jleikhim@nettally.com (Joe Leikhim) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Icom R-71A circuit board Date: Fri, 12 Jan 1996 03:38:48 GMT Organization: CMDS News machine Lines: 20 Message-ID: <4d4l93$92d@server.cntfl.com> References: <30EEE83F.45F0@digital.net> NNTP-Posting-Host: dns90.nettally.com X-Newsreader: Forte Free Agent 1.0.82 Jeff Hutchinson wrote: >I'm restoring a sick R-71A receiver, and need a logic board. Anyone out >there with one for sale or swap? Will buy a basket-case R-71 if the >logic board is okay. Vy 73, from Jeff Try contacting WILLCO electronics At PO box 788 New Lenox, il, 60451 Where; WA9fFVP Jack Albert was selling the icm1024 no fail memory for $149.95 he was also advertising to reload the memory in the IC R71 for $30.00. Please let me know if he's still in business. From lwbyppp@epix.net Wed Jan 17 14:40:49 1996 Path: news.epix.net!news.sprintlink.net!ns1.win.net!sellington!nfourlq Newsgroups: rec.radio.amateur.homebrew Message-ID: <10@sellington.win.net> Reply-To: nfourlq@sellington.win.net (Steve Ellington) From: nfourlq@sellington.win.net (Steve Ellington) Date: Sun, 14 Jan 1996 03:44:56 GMT Subject: Need: Transformer Lines: 8 Need an old power transformer to build a little tube type transmitter. It needs to have a secondary of about 600 to 800 volts and a filiment winding for 6.3 vac. Will be glad to pay for it and for shipping. Please send E mail to N4ZO@AOL.COM GUS N4ZO From lwbyppp@epix.net Wed Jan 17 14:40:50 1996 Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news From: "Thomas C. J. Sefranek" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need: Transformer Date: 15 Jan 1996 14:22:02 GMT Organization: SRC Lines: 5 Message-ID: <4ddnut$kue@news.iii.net> References: <10@sellington.win.net> NNTP-Posting-Host: wa1rhp.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: nfourlq@sellington.win.net You need to list what currents the secondaries need to be. Tom From lwbyppp@epix.net Wed Jan 17 14:40:51 1996 Path: news.epix.net!news.sprintlink.net!news.interserf.net!usenet From: "Nancy A. Sims" Newsgroups: rec.radio.amateur.homebrew Subject: New Meter Faces Date: Mon, 15 Jan 1996 23:34:02 -0800 Organization: Internet Services Of Fredericksburg Lines: 5 Message-ID: <30FB54EA.7C40@interserf.net> NNTP-Posting-Host: nasfred.interserf.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I; 16bit) Need software to make new meter faces. Have Power Point, etc., but can't seem to get the gradient lines perpendicular to the curved scale line. Don't want to do a free-hand, but would like a machine generated scale. Please send E mail to nasfred@interserf.net From lwbyppp@epix.net Wed Jan 17 14:40:52 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!sun!oucsboss!gw2.att.com!gw1.att.com!csn!ub!news.localnet.com!news2.net99.net!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!gatech!udel!faatcrl.faa.gov!faatcrl.faa.gov!usenet From: "Paul D. Seyler" Newsgroups: rec.radio.amateur.homebrew Subject: Re: NiCAD Charger Schematic? Date: Thu, 11 Jan 1996 12:50:26 -0800 Organization: Federal Aviation Administration Lines: 14 Message-ID: <30F57812.58DA@admin.tc.faa.gov> References: <30F3FCB3.2EA8@admin.tc.faa.gov> <4d1714$grd@hpcvsnz.cv.hp.com> NNTP-Posting-Host: 155.178.52.141 X-Mailer: Mozilla 2.0b3 (Win16; I) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Tom Bruhns wrote: > There are several manufacturers of ICs that do most of the job. For > example, if you just follow the circuits in the Maxim data sheet for > the MAX712/713, you can build a "universal" charger that you switch > the number of cells on, or a "custom" charger for a fixed battery ... > Cheers, > Tom > tomb@lsid.hp.com Thanks Tom, this is exactly what I was looking for. I have a couple MAX713's on the way. I looked through MAXIM's 1995 book, but I did'nt realize that thay dont reprint all their parts in the current data book. The MAX713 is in the 1994 data book. What other manufactures make this type of IC? From lwbyppp@epix.net Wed Jan 17 14:40:53 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!infoseek.com!uunet!in2.uu.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: socci@bns101.bng.ge.COM (Vincent Socci ph2828) Newsgroups: rec.radio.amateur.homebrew Subject: RE: Nuts and Volts Date: 15 Jan 96 12:12:02 GMT Organization: ucsd usenet gateway Lines: 33 Message-ID: <9601151212.AA16326@bns101.bng.ge.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I believe the magazine is called "Nuts and Volts", not "Nuts and Bolts" It's basicallly a classified ad magazine with a bunch of technical articles in it. I get it once in a while myself. The articles are usually pretty good . They have "build it yourself" as well as the "look what we did" articles. This month I read one about radio controlled robots. One key feature is that if you are looking for a piece of ham equipment, then someone in the classifie ds is selling it. V ____________________________________________________________________ / Vince Socci / Lockheed Martin Control Systems /| /==============================/====================================/ / / 600 Main Street / Systems Engineer / / / Johnson City, New York / Advanced Controls Engineering / / / 13790-1888 / Email: socci@bns101.bng.ge.com / / / / Callsign: KB2UXU / / / Tel (607) 770-2828 / Marcall Tel: 8*255-2828 / / / Fax (607) 770-2213 / Marcall Fax: 8*255-2213 / / /______________________________/____________________________________/ / |_____________________________/\____________________________________|/ __ __ ________ \ \ / / / ____ / \ \ / / / / /_/ \ \ / / / / \ \/ / \ \ \ / \ \ \/ \ \ /\ / / \ \ / / \ \/ / \ / \/ From lwbyppp@epix.net Wed Jan 17 14:40:55 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.minn.net!skypoint.com!news.cyberstore.ca!news.bctel.net!imci2!newsfeed.internetmci.com!in2.uu.net!news.dialnet.net!news From: Carter Brock Newsgroups: rec.radio.amateur.homebrew Subject: PC-Trace Date: Sat, 13 Jan 1996 15:32:53 -0600 Organization: Digital Internet Access Link, Inc. Springfield, MO 873-DIAL Lines: 8 Message-ID: <30F82505.70A9@dialnet.net> NNTP-Posting-Host: ds14.dialnet.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win95; I) The January issue of Nuts & Volts magazine has an article by T.J. Byers on circuit design software under $100. In this article there is referance to two shareware packages "PC-Trace" and "Schematic Plus" that are advalible from http://users.aol.com/spoulsen/index.htm. I have tried this URL and it goes nowhere. Does anyone have another source for this software? Thanx Carter Brock cbrock@dialnet.net From lwbyppp@epix.net Wed Jan 17 14:40:56 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.uoregon.edu!news.dacom.co.kr!vyzynz!news1.cris.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!news.itd.umich.edu!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: PC-Trace Message-ID: <1996Jan14.195016.12846@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <30F82505.70A9@dialnet.net> Date: Sun, 14 Jan 1996 19:50:16 GMT Lines: 29 In article <30F82505.70A9@dialnet.net> Carter Brock write s: >Content-Transfer-Encoding: 7bit >X-Mailer: Mozilla 2.0b5 (Win95; I) > >The January issue of Nuts & Volts magazine has an article by T.J. Byers >on circuit design software under $100. In this article there is >referance to two shareware packages "PC-Trace" and "Schematic Plus" that >are advalible from http://users.aol.com/spoulsen/index.htm. I have >tried this URL and it goes nowhere. Does anyone have another source for >this software? Back out a little, Carter, and it works, IE try http://users.aol.com/spoulsen/ and you'll get the home page. Click in the download section and you'll get the zip file. Apparently there is no index.htm on the server, and that's what's causing the problem. Note, there seems to be a missing gif on the homepage as well, ignore that too. Just go for the goodies. The zip contains a crippled version of the software, you've got to register it to get it to save and print, but the price is right. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:40:56 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news1!ind-003-236-131 From: mcline@iquest.net (Mike Cline) Subject: Re: PC-Trace X-Nntp-Posting-Host: ind-003-236-131.iquest.net Message-ID: Sender: news@iquest.net (News Admin) Organization: IQuest Internet, Inc. X-Newsreader: News Xpress Version 1.0 Beta #2.1 References: <30F82505.70A9@dialnet.net> Date: Tue, 16 Jan 1996 21:03:41 GMT Lines: 17 Carter Brock wrote: >The January issue of Nuts & Volts magazine has an article by T.J. Byers >on circuit design software under $100. In this article there is >referance to two shareware packages "PC-Trace" and "Schematic Plus" that >are advalible from http://users.aol.com/spoulsen/index.htm. I have >tried this URL and it goes nowhere. Does anyone have another source for >this software? > >Thanx Carter Brock cbrock@dialnet.net Try leaving the "index.html" off of the URL and you'll probably get through, I did. I don't know why, but that happens on ocasion. It was running VERRRRRY slow, and I aborted the download. Mike N9RJW From lwbyppp@epix.net Wed Jan 17 14:40:58 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: re:power inverters Date: 12 Jan 96 19:09:24 GMT Organization: ucsd usenet gateway Lines: 31 Message-ID: <9600128214.AA821481536@mails.imed.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Dave Covert was looking for schematics, etc. for a 12 VDC to 120VAC @1600 Watts inverter. Dave: I suggest that instead of building one, you should just buy one from either Damark or Crutchfield. I don't have either catalog at work today. Various manufacturers make models in power levels from 140 W up to 3000 W continuous duty. The 140W model is about $40 from Damark and the 1500W version is in the $400 to $500 range. You could build your own, of course, but it would probably cost as much as the ones you buy. I know I couldn't build a 140W one for $40. Call Damark @ (800)729-9000. They carry 4 models of inverters made by Recoton. They have a 140 watt unit ($40), a 300 watt unit ($80), a 600watt/1000 watt peak unit ($200), and a 1500 watt continuous/3000 watt peak unit ($450). You can drive a LOT of stuff with 3000 watts of peak power. You need VERY big cable to attach from the battery to the inverter. 3000 watts @ 12v is 265 Amps! It is interesting to note that the reason these have gotten so inexpensive is that they are the principle ingredient in the megawatt car stereo amplifiers! That's the only way they can get the power from a 12V car battery. Ray Mack WD5IFS mack@mails.imed.com From lwbyppp@epix.net Wed Jan 17 14:40:58 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Publishing Articles Date: 16 Jan 1996 19:56:04 GMT Organization: Dover Research Corp. Lines: 7 Message-ID: <4dgvsk$pvp$2@mhafc.production.compuserve.com> I agree with what you say "mostly". In my case of the DigiVFO the parts I cal led out are not easily subed out. One the HSP45102 is a problem for me to keep on hand so I have to tell people who call and write for info on where to buy them to please don't. I want em! Actualy that is not as big a problem as i t was at first but "some" parts are strange and weird. Most are not! -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Wed Jan 17 14:41:00 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Fri, 12 Jan 1996 16:47:00 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 31 Message-ID: References: <4d1clt$c1q@mgate.arrl.org> <4d5d2l$90g@newsbf02.news.aol.com> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4d5d2l$90g@newsbf02.news.aol.com> Yes, I would also like to see a flow diagram or something similar..W6HDO On 12 Jan 1996, W8JI Tom wrote: > In article <4d1clt$c1q@mgate.arrl.org>, Ed Hare writes: > > >All in all, I think QST offers a good balance of articles, ranging from > >some higher-tech articles, lots of articles for the middle ground and a > >substantial section of articles that are chosen because they would > >interest newcomers. (Now, for me, the DXCC and contest results hold > >little interest, but I just assume they are there for someone else and > >let it go at that.) I would join the howls of protest if all of our > >articles became the "buy the kit" articles, but really don't mind seeing > >the occasional gem that is like the auto-tuner-kit article. > > > >73 from ARRL HQ, Ed Hare, KA1CV, ARRL Laboratory Supervisor > > > > > > Nice response Ed! That's a tough job, to satisfy everyone. > > But I still have a question. Can anyone post or E-mail a flow chart of the > software? I am trying to find out how the author handled that interesting > part of the problem. Does anyone that built the tuner understand how the > software works enought to describe the basic idea behind it? > 73 Tom > > > > From lwbyppp@epix.net Wed Jan 17 14:41:01 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.voicenet.com!uunet!in2.uu.net!newsfeed.internetmci.com!gatech!pirates!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: QST Automatic Tuner Article Message-ID: <1996Jan11.172522.24768@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4d1clt$c1q@mgate.arrl.org> Date: Thu, 11 Jan 1996 17:25:22 GMT Lines: 47 In article <4d1clt$c1q@mgate.arrl.org> Ed Hare writes: >All in all, I think QST offers a good balance of articles, ranging from >some higher-tech articles, lots of articles for the middle ground and a >substantial section of articles that are chosen because they would >interest newcomers. (Now, for me, the DXCC and contest results hold >little interest, but I just assume they are there for someone else and >let it go at that.) I would join the howls of protest if all of our >articles became the "buy the kit" articles, but really don't mind seeing >the occasional gem that is like the auto-tuner-kit article. I think it is a good advertisement. But ads don't belong as the feature article in the *technical* section of the magazine. Perhaps you could stretch a point and put it in with the other *product reviews*, or give it coverage in the *New Products* section, but I really think it belongs in the back with all the other *paid* advertising by kit manufacturers. Whether this is a great kit or not isn't the point, whether it is a popular kit or not isn't the point, whether it is an economical kit or not isn't the point. The point is that this isn't a technical construction article because the primary information that makes it an *auto* tuner is hidden from the reader. It's an ad, and QST used member funds to *pay* to run this ad. That's not how it's supposed to work. The company is supposed to pay *QST* for advertising space. Firmware is virtual circuitry. Withholding information about the firmware in a construction article is no different from withholding schematic diagrams. Would you support paying for and publishing a construction article that required the reader to buy the schematic separately from the article author? (I might, that's essentially what you're doing when you use any commercial IC. If you want the internals, you have to buy the manufacturer's data book.) But more to the point here, should you print a construction article where you can't obtain the schematic, even from the author? I think not, that's like the magic antenna tuner which was just a glob of expoxy hiding a power resistor that QST correctly X-rayed and brought to public attention a number of years ago. (Note: that's not a totally bogus idea in certain special circumstances, but the way it was presented bordered on fraud because there was no way to determine how it worked thanks to the deliberately hidden internals.) Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:41:03 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!NEWS!not-for-mail From: ke3mf@atc.ameritel.net (Glenn Thorn) Subject: Re: QST Automatic Tuner Article Message-ID: <1e7cc$2171c.2ba@NEWS> Date: Sun, 14 Jan 1996 07:43:39 GMT References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4d1clt$c1q@mgate.arrl.org> <1996Jan11.172522.24768@ke4zv.atl.ga.us> X-Newsreader: Forte Free Agent 1.0.82 Lines: 59 gary@ke4zv.atl.ga.us (Gary Coffman) wrote: Snip >Firmware is virtual circuitry. Withholding information about the >firmware in a construction article is no different from withholding >schematic diagrams. Would you support paying for and publishing >a construction article that required the reader to buy the schematic >separately from the article author? (I might, that's essentially >what you're doing when you use any commercial IC. If you want the >internals, you have to buy the manufacturer's data book.) But more >to the point here, should you print a construction article where you >can't obtain the schematic, even from the author? I think not, that's >like the magic antenna tuner which was just a glob of expoxy hiding >a power resistor that QST correctly X-rayed and brought to public >attention a number of years ago. (Note: that's not a totally bogus >idea in certain special circumstances, but the way it was presented >bordered on fraud because there was no way to determine how it worked >thanks to the deliberately hidden internals.) >Gary >-- >Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary >Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary >534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us >Lawrenceville, GA 30244 | | The authors of the autotuner were a bit concerned since they didn't want 2 years of work to be stolen by another company and their code put to use in another "like product". A few other points: - The code is of no use to 90 percent of those who build the tuner, Assembly is not easy to sit down and understand. - You must have some way to burn the chip, the tuner doesn't have RS-232 capibility. - Dwayne will release the code for an SASE and a disk, call him! - The ARRL did not print the flow chart of the software, that was their choice. (My quess is it wouldn't mean much to the majority of the readers) I asked Dwayne to give me the .s19 file for posting here. It is the Hex dump to the chip so if you have a burner, you can upload it to the chip if you want to purchase it or already have one. I think he will do it, please post or E-mail if you want it (free, of course). In case anyone cares, I did the initial relay testing and final product testing... for no compensation. Great comments, everyone! 73, de Glenn, KE3MF From lwbyppp@epix.net Wed Jan 17 14:41:05 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom2!faunt From: faunt@netcom2.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Subject: Re: QST Automatic Tuner Article In-Reply-To: ke3mf@atc.ameritel.net's message of Sun, 14 Jan 1996 07:43:39 GMT Message-ID: Sender: faunt@netcom2.netcom.com Organization: at home, in Oakland References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4d1clt$c1q@mgate.arrl.org> <1996Jan11.172522.24768@ke4zv.atl.ga.us> <1e7cc$2171c.2ba@NEWS> Date: Sun, 14 Jan 1996 16:15:46 GMT Lines: 62 Newsgroups: rec.radio.amateur.homebrew From: ke3mf@atc.ameritel.net (Glenn Thorn) Date: Sun, 14 Jan 1996 07:43:39 GMT The authors of the autotuner were a bit concerned since they didn't want 2 years of work to be stolen by another company and their code put to use in another "like product". I'm not convinced this fear is realistic, but it is apparently there. Once again, I refer to the KA9Q code, and the protections it has. I'd also be willing to sign a non-commercial use agreement, myself, but that doesn't affect the education of the general ham population issue. A few other points: - The code is of no use to 90 percent of those who build the tuner, Assembly is not easy to sit down and understand. It's not that hard, either. And there are a lot of us who've done some of this at various times. The architecture of the 6800 is not complicated, and if there's a framework to build on, it's even easier. And, refering back to the KA9Q example, many people have contributed to that effort to the benefit of the whole community. But should the article be aimed at only those who build the tuner? How about those who would be able to learn from the article how such a thing is done? - You must have some way to burn the chip, the tuner doesn't have RS-232 capibility. Once again, adding this is not hard. I actually want to be able to control the tuner via RS-232, so it's got double usage. Software for this is freely available. I suspect that most of us who would make changes would have to replace the A1 version (512 bytes of EEPROM) of the uprocessor with the 8E2 (2048 bytes) version, to have some working room. This is the big expense. - Dwayne will release the code for an SASE and a disk, call him! Now this seems to be a new offer, that I plan to take up. - The ARRL did not print the flow chart of the software, that was their choice. (My quess is it wouldn't mean much to the majority of the readers) I've already sent a SASE for the flowchart. I asked Dwayne to give me the .s19 file for posting here. It is the Hex dump to the chip so if you have a burner, you can upload it to the chip if you want to purchase it or already have one. I think he will do it, please post or E-mail if you want it (free, of course). In case anyone cares, I did the initial relay testing and final product testing... for no compensation. Thnak you very much for this. This is one of the parts of the unit that makes it a worthwhile article as it is, and such a shame that it stopped when it did. Great comments, everyone! 73, de Glenn, KE3MF 73, doug From lwbyppp@epix.net Wed Jan 17 14:41:06 1996 Path: news.epix.net!news.sprintlink.net!news.isl.net!usenet From: tdrumm@sparc.isl.net (Tony Drumm) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Sun, 14 Jan 96 08:44:21 CST Organization: InfoNet Lines: 30 Message-ID: <4db5po$akn@news.isl.net> References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4d1clt$c1q@mgate.arrl <1e7cc$2171c.2ba@NEWS> NNTP-Posting-Host: ppp-08.isl.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.9 In article <1e7cc$2171c.2ba@NEWS>, ke3mf@atc.ameritel.net says... > >gary@ke4zv.atl.ga.us (Gary Coffman) wrote: >>Firmware is virtual circuitry. | | > > >- The code is of no use to 90 percent of those who build the tuner, >Assembly is not easy to sit down and understand. > >- The ARRL did not print the flow chart of the software, that was >their choice. (My quess is it wouldn't mean much to the majority of >the readers) > I have a lot of mixed emotions on this. It *is* 1996 and ICs are the way electronics are built today. I'd like to see more use of high-function ICs in home-build articles. On the other hand, it *is* 1996 and a lot of us make our living doing software. I view these articles as something to learn from. I was unhappy that there wasn't at least a flow chart. My guess is radio electronics may not mean much to a large portion of QST's readership - that's not the best excuse. The idea is to teach something. I like the idea of being able to get all the parts somewhere and get the parts that are tough to do at home (like the programmed IC). But, ever curious, I would like to know how it works. Tony AA0SM From lwbyppp@epix.net Wed Jan 17 14:41:07 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: 14 Jan 1996 10:36:36 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 15 Sender: root@newsbf02.news.aol.com Message-ID: <4db7u4$op8@newsbf02.news.aol.com> References: <4d7lvt$cea@newsbf02.news.aol.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader << The authors of the autotuner were a bit concerned since they didn't want 2 years of work to be stolen by another company and their code out to use in another "like product". >> That statement indicates data was withheld just to protect "two years of work" that went into the software. So which reason was it really? Was data accidently left out by QST as a mere oversight or space saving gesture, or did the author request it be left out as a favor to protect "two years" of work? This is begining to sound like someone danced around the truth a bit in the earlier replies. Tom From lwbyppp@epix.net Wed Jan 17 14:41:08 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!NEWS!not-for-mail From: ke3mf@atc.ameritel.net (Glenn Thorn) Subject: Re: QST Automatic Tuner Article Message-ID: <1f7cc$12f11.27a@NEWS> Date: Mon, 15 Jan 1996 07:07:23 GMT References: <4d7lvt$cea@newsbf02.news.aol.com> <4db7u4$op8@newsbf02.news.aol.com> X-Newsreader: Forte Free Agent 1.0.82 Lines: 36 w8jitom@aol.com (W8JI Tom) wrote: >So which reason was it really? Was data accidently left out by QST as a >mere oversight or space saving gesture, or did the author request it be >left out as a favor to protect "two years" of work? The source code wasn't submitted to QST, the software flow chart was, and they chose not to publish that. There was no accident. QST, being the fine journal that it is, wouldn't practice the ethics implied. They bench tested the unit to ensure it did what was claimed. They aren't going to stake their reputation on something as trivial. >This is begining to sound like someone danced around the truth a bit in >the earlier replies. I fail to understand the statement. Dwayne and Gene did a lot of pondering on the release of the source before they submitted the article. They (I can't speak for QST) didn't know peoples feelings on the source code release. That is why they are releasing the code... because people want it. All the comments posted and E-Mailed had a voice and it was listened to. I never know if I did something right or wrong unless there is feedback. Feedback is a good thing. There is no dancing, right, or wrong to the situation. What ever their reasons, they listen to comments. If someone doesn't like the article, turn the page. Any future articles will have source code (probley downloadable from the ARRL board). Thank you and everyone for the great comments! 73, Glenn From lwbyppp@epix.net Wed Jan 17 14:41:09 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!demon!ifwtech.demon.co.uk!G3SEK From: Ian White Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: Mon, 15 Jan 1996 07:31:27 +0000 Organization: IFW Technical Services Lines: 42 Distribution: world Message-ID: References: <128@bdam.win.net> <4c6es2$394@mgate.arrl.org> <4d1clt$c1q@mgate.arrl.org> <1996Jan11.172522.24768@ke4zv.atl.ga.us> <1e7cc$2171c.2ba@NEWS> <1996Jan14.192821.12600@ke4zv.atl.ga.us> NNTP-Posting-Host: ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL> In article <1996Jan14.192821.12600@ke4zv.atl.ga.us>, Gary Coffman wrote: >There's altogether too much fear among programmers (and inventors) >that their ideas will be stolen. It happens rarely in practice, and >when it does there are legal remedies. I don't want to fuel paranoia among programmers, but it certainly has happened that hardware designs (including items such as PC board layouts) are blatantly offered on a commercial basis without the author's permission. See the earlier postings by N7WS. Another example involved a hardware design by a VK amateur being ripped off and sold in the USA. By "ripped off" I mean that little or nothing was added to the original design, and the guy who'd done all the work never saw a red cent. In most of these amateur radio cases, the amount of money involved is only a few hundreds of dollars, or at most a few thousand. So although the legal remedy exists in principle, it isn't possible in practice. Unfortunately some cynical commercial dealers are completely aware of this. Even more serious is that after such an experience the victim is far less likely to publish anything again - and that is a loss to all of us. >It's far more important for >a QST technical article to teach by example than any fear that someone >may somehow benefit from the author's work. The only way pirating of >this code could benefit another company at the expense of the original >author is if they incorporated it into a better product at a better >price. Sadly, that's no longer true. If a popular homebrew project is ripped off and marketed as a ready-built product, it will sell like hot cakes. > 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From lwbyppp@epix.net Wed Jan 17 14:41:11 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: 16 Jan 1996 10:13:02 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 48 Sender: root@newsbf02.news.aol.com Message-ID: <4dgf9u$34g@newsbf02.news.aol.com> References: NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article , Ian White writes: > >Sadly, that's no longer true. If a popular homebrew project is ripped >off and marketed as a ready-built product, it will sell like hot cakes. > >> > >73 from Ian G3SEK Ian, I think we miss the point. When an article is published as a teaching aid, it is given away to everyone. The author should be prepared for that. For example, I designed some phased receiving loops for HF many years ago. Because I decided I wanted to market the design, I chose NOT to give any of the information to anyone. But if I published the idea and gave it away, it's gone. If someone copies it and makes money, I may not like it but....tough luck. I made my choice when I decided to give it away. I'll be damned if I would print part of it and make the readers come begging just to "protect my work". That decision is history when I decide to help others duplicate my work. I know you make choices like that Ian. You sent me a regulator board layout for HV supplies, and I make my living selling high power amplifier designs. I may make money from something that I "stole" from you. If you didn't want to run that risk, you wouldn't have sent me the board. I'm sure you knew I make money from projects like that, sometimes substantial money. And sometimes I give work away just to help people because I like to help. Especially when they help other people. I think articles are published to help people understand how something works. If you don't want your idea used by others, don't publicize it. Once you decide to share it, you've shared it. If someone wants to make money from it, more power to them. I wonder where we'd be if Ohm kept his work secret so people wouldn't steal it? Maybe it'd be Ian's law, eh?? ;-) How many of us have sent Ohm's desendents a Royality payment? How many of us watch someone else do something, and copy the idea? How about Edison? Come on now, if you don't want your idea "stolen" keep it to yourself. Don't print it under the guise of helping teach and then cry thief. 73 Tom From lwbyppp@epix.net Wed Jan 17 14:41:13 1996 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Re: QST Tuner Article Message-ID: <1996Jan12.182122.207@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <9600118213.AA821378459@mails.imed.com> Date: Fri, 12 Jan 1996 18:21:22 GMT Lines: 32 Xref: news.epix.net rec.radio.amateur.homebrew:12665 rec.radio.amateur.antenna:18398 In article faunt@netcom4.netcom.com ( Doug Faunt N6TQS +1-510-655-8604) writes: >Does the copyleft protect the authors from someone else using the code >in a commercial product, or just specify that all changes, as well as >the original source must be made available? The latter. It also prohibits charging for the code, though a media and distribution charge is allowed. Thus someone can't take your program and go sell it, but they can charge a media and distribution fee to *give* it away. Copyleft is a powerful idea, born of concepts of academic freedom. It encourages development by allowing access to the work of others so you don't have to constantly be reinventing the wheel, but can stand on the shoulders of giants while making your contribution. It also, due to the mandatory source availability, is a powerful teaching tool. It allows anyone to see how things work, and how a particular problem might be addressed by a practitioner in the field. This latter is particularly important to an organization like the ARRL which maintains its tax exempt status by claiming to be an educational organization. If they wish to teach us about *auto* tuners, then they'd better show us how the *auto* part works. Trade secrets have no place in a tax exempt educational organization's lead publication. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:41:14 1996 Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!ub!news.kei.com!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: Re:QST Tuner Article Date: 11 Jan 96 14:29:13 GMT Organization: ucsd usenet gateway Lines: 27 Message-ID: <9600118213.AA821378459@mails.imed.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu A thought occurred to me regarding the source code issue for this article. One of the problems is that it is so easy for a commercial outfit to simply lift the code as is and make profits from what was intended to be freely distributed. As a software professional, I would be really hot if something I wrote in order to give away for the benefit of the fraternity were used for profit by someone. There is a way to protect the rights of the authors and still allow free distribution for amateur personal use. All the author has to do is to copyright the source code for the program. QST should have the policy that they will publish articles containing copyrighted software ONLY if the copyright holder grants a license to use for personal use only. I would encourage authors to incorporate the "copyleft" of the Free Software Foundation. This is a more restrictive copyright. It says that if you modify the software for your personal use and make improvements, you must share those improvements freely with others. This is the spirit of amateur radio at its best, IMHO. BTW, the article was a really neat idea. I may build one similar soon. Ray Mack WD5IFS mack@mails.imed.com From lwbyppp@epix.net Wed Jan 17 14:41:15 1996 Path: news.epix.net!news.sprintlink.net!buffnet2.buffnet.net!bga.com!realtime.net!news.mindspring.com!news2.net99.net!agis!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: 9 Jan 1996 05:39:45 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 38 Sender: root@newsbf02.news.aol.com Message-ID: <4ctglh$ns2@newsbf02.news.aol.com> References: <821099029.19663@pinetree.microserve.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <821099029.19663@pinetree.microserve.com>, jackl@pinetree.microserve.com (WB3U) writes: > >First, maintaining the correct phase at the output of each filter is >probably impossible because the shift will vary across each filter's >passband. I'm not sure how significant this phase shift will be in >terms of the percieved quality of the recovered audio, but having been >in the audio business a number of years, it's a troublesome concept. >Multiple-band phase shift is one of the characteristics of graphic >equalizers said by many (including yours truly) to degrade their sound >quality. This may not be a significant issue in this application, >but I'd be very interested in a critical listening test of the audio >quality of one of these processors (with the filters active but the >clipping turned off). To clarify this a little, I'm not just referring >to the amplitude cancellation that takes place as a result of phase >shift, but also to the audible effects of the phase shift itself. > > Hi Jack, Vomax did this by having the "after clipping" filter shift the phase back at the same slope as the pre-clipping filter. At RF phase control would be easier, but the filter cost would be pretty high. I don't see how phase shift would be a problem with DSB as long as a narrow RF filter is avoided, but then the worry would become the lack of signal filtering. There must be some BW control before clipping. Perhaps an audio bandpass filter before the balanced modulator would help, since as Wes said, the lows should be rolled off a bit before clipping and we all know clipping out of band audio just adds needless distortion. I'm working on a DSP based processor now, in between 999 other things. 73 Tom From lwbyppp@epix.net Wed Jan 17 14:41:17 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!waikato!news.massey.ac.nz!sysadmin From: G.Moretti@massey.ac.nz Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: 11 Jan 1996 06:23:56 GMT Organization: Massey University, Palmerston North, NZ Lines: 16 Distribution: world Message-ID: <4d2ads$942@cc-server9.massey.ac.nz> References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <4cmp0n$2fb@newsbf02.news.aol.com> <820988469.19749@pinetree.microserve.com> <4cs3ht$q0@mksrv1.dseg.ti.com> Reply-To: G.Moretti@massey.ac.nz NNTP-Posting-Host: sis-pc10.massey.ac.nz X-Newsreader: IBM NewsReader/2 v1.03 Hi Interesting discussion ... I built one of Wes' Split band speech processors an d I'm still using it - works great - thanks Wes. An idle thought regarding comprehension. Has anyone tried using formant filte rs rather than just 300-3000 speechband filters? I'm mainly thinking about recei ve filtering but possibly in a processor as well. I vaguely remember a simple RC filter years ago (from NASA) that was supposed to put notches into the transmitted audio where there shouldn't be any speech info. Ring any bells? Cheers Giovanni ZL2BOI - currently discovering 40M after years with an 80/20 QRP SSB rig. From lwbyppp@epix.net Wed Jan 17 14:41:18 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!news.funet.fi!news.cc.tut.fi!proffa.cc.tut.fi!not-for-mail From: k23690@proffa.cc.tut.fi (Kein{nen Paul) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: 14 Jan 1996 13:55:38 +0200 Organization: Tampere University of Technology Lines: 48 Distribution: world Message-ID: <4daqvq$gi6@proffa.cc.tut.fi> References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <820988469.19749@pinetree.microserve.com> <4d0kr1$1nl@proffa.cc.tut.fi> NNTP-Posting-Host: proffa.cc.tut.fi Wes Stewart (n7ws@azstarnet.com) wrote: > In article <4d0kr1$1nl@proffa.cc.tut.fi> k23690@proffa.cc.tut.fi > (Kein{nen Paul) writes: >>Think about a simple waveform consisting of frequencies f and 2f and both >>have the positive peak at the same time (this resemples the speech >>waveform). aAssume that f and 2f fall into different subbands as clean >>stable sinus signals with no need for clipping. Summing these signals >>and you get a positive peak twice as high as the individual signal. This >>corresponds to four time peak power in an SSB transmitter compared >>to a single tone. > >This is what we call an amplifier with a gain of two. If this >overmodulates the transmitter, we can reduce the audio gain control >accordingly. > >> You have gained nothing with a multiband clipper. > >With your example, we can't call it a clipper because you specified no >clipping is occurring. Obviously, there is nothing gained until we *do* allow >clipping. That's what it's all about. Allowing clipping does not change the situation. If we set the clipping at +/- 1/2 the peak amplitude in each channel, we get square waves with half the amplitude of the pure tones (f and 2 f). Bandlimiting the channels, the harmonics of the square wave are filtered out and we get sine waves at 1/2 the original amplitude. Summing these signals, we get the original signal envelope which is attenuated by 6 dB. Since the envolope is still the same, there is not an improvement in peak-to-average ratio compared to the case of no clipping. I admit that assuming that the f and 2f tones of the original signal are a bit unrealistic. For typical voice signals the harmonics are weaker and the high frequency channels will not limit as easily as the low frequency channels. The net effect is a change in the spectral contents of the signal favoring the high frequencies. This is just a high-pass filter with the corner frequency controlled by the signal level :-) While it is interesting to debate the peak-to-average, readability is a much more complex subject. Other factors, such as the quality of the voice (male/female) the spectrum of the noise+interference at the receiving site affect the readability. Paul OH3LWR From lwbyppp@epix.net Wed Jan 17 14:41:20 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: 14 Jan 1996 10:37:44 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 28 Sender: root@newsbf02.news.aol.com Message-ID: <4db808$oq7@newsbf02.news.aol.com> References: <4daqvq$gi6@proffa.cc.tut.fi> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4daqvq$gi6@proffa.cc.tut.fi>, k23690@proffa.cc.tut.fi (Kein{nen Paul) writes: >If we set the clipping at +/- 1/2 the peak amplitude in each channel, >we get square waves with half the amplitude of the pure tones (f and 2 f). >Bandlimiting the channels, the harmonics of the square wave are filtered >out and we get sine waves at 1/2 the original amplitude. Summing these >signals, we get the original signal envelope which is attenuated by 6 dB. >Since the envolope is still the same, there is not an improvement in >peak-to-average ratio compared to the case of no clipping. > > No, what we get is a signal that has all the levels at different frequencies limited at the same threshold, exactly what we try to do in any processor! The result is instantaneous "compression" or limiting of each frequency sub-band to a predetermined level. It can then be re-mixed at the level we desire without the addition of unwanted intermodulation products or harmonics of the original input. We have simply removed all amplitude variations in individual sub-bands and re-combined them at the ratios that improve communications without adding unwanted byproducts. The improvement is very real on speech, but not on a two tone test. 73 Tom From lwbyppp@epix.net Wed Jan 17 14:41:21 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr5ip42.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: Sun, 14 Jan 1996 14:26:14 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 84 Distribution: world Message-ID: References: <4ck2p5$kup@pacific.mps.ohio-state.edu> <820988469.19749@pinetree.microserve.com> <4d0kr1$1nl@proffa.cc.tut.fi> <4daqvq$gi6@proffa.cc.tut.fi> NNTP-Posting-Host: usr5ip42.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4daqvq$gi6@proffa.cc.tut.fi> k23690@proffa.cc.tut.fi (Kein{nen Pau l) writes: >From: k23690@proffa.cc.tut.fi (Kein{nen Paul) >Subject: Re: Question: RF Speech Processing >Date: 14 Jan 1996 13:55:38 +0200 >Wes Stewart (n7ws@azstarnet.com) wrote: >> In article <4d0kr1$1nl@proffa.cc.tut.fi> k23690@proffa.cc.tut.fi >> (Kein{nen Paul) writes: >>>Think about a simple waveform consisting of frequencies f and 2f and both >>>have the positive peak at the same time (this resemples the speech >>>waveform). aAssume that f and 2f fall into different subbands as clean >>>stable sinus signals with no need for clipping. Summing these signals >>>and you get a positive peak twice as high as the individual signal. This >>>corresponds to four time peak power in an SSB transmitter compared >>>to a single tone. >> >>This is what we call an amplifier with a gain of two. If this >>overmodulates the transmitter, we can reduce the audio gain control >>accordingly. >> >>> You have gained nothing with a multiband clipper. >> >>With your example, we can't call it a clipper because you specified no >>clipping is occurring. Obviously, there is nothing gained until we *do* allo w >>clipping. That's what it's all about. >Allowing clipping does not change the situation. >If we set the clipping at +/- 1/2 the peak amplitude in each channel, >we get square waves with half the amplitude of the pure tones (f and 2 f). >Bandlimiting the channels, the harmonics of the square wave are filtered >out and we get sine waves at 1/2 the original amplitude. Summing these >signals, we get the original signal envelope which is attenuated by 6 dB. >Since the envolope is still the same, there is not an improvement in >peak-to-average ratio compared to the case of no clipping. Not quite correct but OK as far as it goes. If you have a perfect square wave, which you will approach in your example, the peak amplitude of the fundamental component is actually (4/pi)* square wave peak. But, you are focusing on just two frequency components, not the whole voice spectrum that is there simultaneously. There are many many components present that have amplitude below the clipping threshold. These pass through with unity gain while the higher amplitude components have their relative amplitude reduced. This DOES reduce the peak to average ratio. >I admit that assuming that the f and 2f tones of the original signal are >a bit unrealistic. For typical voice signals the harmonics are weaker >and the high frequency channels will not limit as easily as the low >frequency channels. The net effect is a change in the spectral contents >of the signal favoring the high frequencies. Actually, and this is somewhat counter to what I just stated, you might consider that the weaker high frequency components are riding on larger low frequency components. When the lows are clipped, the highs are suppressed too. This can also change the effective overall frequency response. The nice thing about the split-band approach is this: you don't necessarily have to have the same gain in each channel. The frequency response and degree of clipping can be tailored in a very flexible fashion. I have experimented with several dB of pre-clipping pre-emphasis and obtained reports of excellent "punch", admittedly at the expense of "naturalness". >This is just a high-pass filter with the corner frequency controlled >by the signal level :-) No. >While it is interesting to debate the peak-to-average, readability is a >much more complex subject. Other factors, such as the quality of the voice >(male/female) the spectrum of the noise+interference at the receiving >site affect the readability. Certainly. But this is not a valid criticism of processsing, just because it isn't the total answer. That is like saying don't bother with a better antenna or more power because the signal may still be noisy at the other end. If the difference is between noisy communication and no communication at all, which would you choose? > Paul OH3LWR Wes -- N7WS From lwbyppp@epix.net Wed Jan 17 14:41:22 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news.isp.net!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!DIALix!brisbane.DIALix.oz.au!not-for-mail From: mkelly@brisbane.DIALix.oz.au (Murray Kelly) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: RF Speech Processing Date: 12 Jan 1996 03:11:08 +1000 Organization: DIALix Services, Brisbane, Australia. Lines: 13 Sender: mkelly@brisbane.DIALix.oz.au Message-ID: <4d3gbc$4lp$1@brisbane.DIALix.oz.au> References: <821099029.19663@pinetree.microserve.com> <4ctglh$ns2@newsbf02.news.aol.com> NNTP-Posting-Host: mkelly@brisbane.dialix.oz.au I don't see how you can avoid the problem of the lower SB mixing with the upper SB of the 1st harmonic. Add em together and it looks like a clipped audio signal - the AF harmonics mix. The only way round this is to use side band (single) and/or very soft clipping. If one clips SSB the harmonics reflect away from the base band rapidly and the mixing products are removed by the very broad 2nd SSB filter after the clipper. No probs. Murray Kelly vk4aok. From lwbyppp@epix.net Wed Jan 17 14:41:23 1996 Path: news.epix.net!news.sprintlink.net!news.charm.net!news.cais.net!news.structured.net!nntp.teleport.com!psgrain!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!haven.umd.edu!cs.umd.edu!coopnews.coop.net!news.den.mmc.com!NewsWatcher!user From: thomas.g.booth@den.mmc.com (Booth, Thomas G) Newsgroups: rec.radio.amateur.homebrew Subject: R-1051 Frequency Standard Pinout, Anyone? Followup-To: rec.radio.amateur.homebrew Date: 11 Jan 1996 21:14:20 GMT Organization: A Turbulent One Lines: 12 Distribution: usa Message-ID: NNTP-Posting-Host: 160.205.101.24 A while back I picked up a surplus frequency standard unit from an R-1051 receiver for a little oscillator project. Now that I'm getting serious about using it, I've lost the pinout for it (of course, if I had a complete R-1051, I'd be able to figure it out myself...). Anyway, if you can followup w/ info on the A1 thru A6 coax pins & the seven single conductor pins on the P1 connector, I'd be much obliged. TIA, TGB \\ The opinions expressed herein are my own. // From lwbyppp@epix.net Wed Jan 17 14:41:25 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!agate!holonet!colossus.holonet.net!minfox!jim.horner From: jim.horner@minfox.com (Jim Horner) Newsgroups: rec.radio.amateur.homebrew Subject: Re: recommend good kids' Date: Fri, 12 Jan 1996 17:41:00 GMT Message-ID: <9601121820288902@minfox.com> Organization: MINFOX Courtenay, BC (604)-337-2023 Distribution: world References: <4d3mg1$4rt@kocrsv08.delcoelect.com> <30F0539E.5857@tiger.ab.ca> <4d1f98$9js@ne Lines: 93 TV>When my boys were in scouts, the scout leader asked me about crystal sets. I TV>fered a TV>slightly different suggestion for a project. W TV>e bought RadioShack "Flavor-Radio's for about 5$ apiece, disassembled them i TV> semi-kit form, TV>ie: case, speaker, battery, and circuit board, and set up an oscillator, vo l TV>ter and TV>soldering station. We helped helped each of the boys with re-assembly, aft e TV>etting them test TV>the battery and the speaker and earphone. Over about 3 meetings each boy le a TV>d something TV>about electronics, and had a real working radio that he had built and could TV>w off without a TV>100' outdoor antenna. along this same line... Here is a simple AM broadcast band, regenerative receiver. It uses the stick antenna and the tuning capacitor from a junked AM receiver. 47Kohm o-----R-----o | | .04uF stick antenna | ,---o---o--||--o----o u-make L3 L1 L2 .01uF | b ,/c | | | | ./^^^\ ./^^^^^^^^^^\./^^^^----||---o----< | | | | | | | | Q1 `\e | | R | | | | / | NPN | | R 22Kohm | +5-9v | o----||------o---------------------/' /' 1Kohm | | | / | o------o/' | | | | tuning cap --- | | | | | /// gnd | +5-9v----o------o | | | | o---pot1-------pot2-------||-----o o---<---------o regenerative^ .01uF | diode feedback loop | o----X-tal earphone----o | --- ///gnd Feedback Loop Detail 20K 1K pot1 pot2 / | \ / | \ to L3_________/ |_________/ | wiper | | .01uF | |---------||----from collector |____R___| 1K 1. o ' ` . represent continuity, not components. 2. L1 and L2 are part of the stick antenna. There are 4 leads on the stick. The bigger coil goes across the tuning cap. 3. L3 is made by wrapping a strip of light cardboard around the ferrite stick and taping it. The idea is to have a short tube that you can slide back and forth a little bit on the ferrite stick. L3 is 4-7 turns of hookup wire wound on this tube, and taped in place. It makes a difference which way current flows here. If you aren't getting oscillations, you can slip this cardboard/coil/tape assembly off the stick, flip it end for end, and slip it back on. 4. The circuit should be built over a sheet of conductive material connected to gnd. This `ground plane' helps the stability/performance quite a bit. I'm not sure why, but it does. Operation. The feedback control is very sensitive. Turn the coarse control (20K pot) very slowly and you should hear noise in the X-tal earphone. The noise only occurs at the point where the circuit starts to break into oscillation. You must be just below, (but very close to), this point to hear AM broadcasts. Feedback can also be controled by sliding L3 a little bit along the ferrite stick. When you find the point where oscillation starts back off a tiny tiny bit on the 20K, and sneak up on it with the fine control (1K pot). You have to operate the fine control pot with one hand, and the tuning cap with the other, to tune across the band. Lower frequencies need less feedback. If you can't get a noise in the earphone: 1. L3 is backwards. Turn it around 2. There is too much feedback even with pot 1 adjusted for max R. Remove turns from L3 I'm a beginning DIY electronics student, and not a ham, but I had a lot of fun and learned a lot from this circuit when I started trying to teach myself this stuff at almost 40 :). ...jim --- * OLX 2.1 TD * Binary tagline supplied on request. Some Assembly req'd. From lwbyppp@epix.net Wed Jan 17 14:41:26 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!news.dacom.co.kr!usenet.seri.re.kr!news.kreonet.re.kr!usenet.kornet.nm.kr!usenet From: Butch Weber Newsgroups: rec.radio.amateur.homebrew Subject: Remote Operating of HF station (VHF or Telephone)? Date: Tue, 16 Jan 1996 15:05:15 -0500 Organization: KORNET (Korea Telecom) Lines: 12 Message-ID: <30FC04FB.E47@soback.kornet.nm.kr> NNTP-Posting-Host: 168.126.195.21 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win16; I) Hello, I am looking for any information on remote operation of my HF rig. I have a Kenwood TS-440S/AT with a CL-36 with 40 meter attachment at work and live in an apartment. I know I have seen articles in the past about remote operations but I am in Korea and don't have access to all my past magazine articles. I am using a 486 DX2-66 and would like to interface the computer as well. I haven't seen anything on the Web that relates to remote operating. If there is and I missed it could someone please pass the information. Thanks, Butch HL9BW eMail = bweber@soback.kornet.nm.kr From lwbyppp@epix.net Wed Jan 17 14:41:27 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: Re:RF compression Date: 12 Jan 96 19:34:26 GMT Organization: ucsd usenet gateway Lines: 15 Message-ID: <9600128214.AA821482740@mails.imed.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu There has been a thread here for a few days regarding SSB processing, vs DSB processing vs split band baseband processing. It started me thinking about some products the Philips and others make called compandors (compression/expander like modem is modulator/demodulator). Does anyone know if these products do the kind of compression that we seek to do in the amateur service with RF kinds of things? I have never seen an amateur use of these devices that I can remember. The only thing close was the section in the 1985 Handbook on amplitude-compandored SSB. Ray Mack WD5IFS mack@mails.imed.com From lwbyppp@epix.net Wed Jan 17 14:41:28 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: RF compression Message-ID: <1996Jan13.093618.4054@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <9600128214.AA821482740@mails.imed.com> Date: Sat, 13 Jan 1996 09:36:18 GMT Lines: 29 In article <9600128214.AA821482740@mails.imed.com> mack@mails.imed.COM writes: >There has been a thread here for a few days regarding SSB processing, >vs DSB processing vs split band baseband processing. > >It started me thinking about some products the Philips and others make >called compandors (compression/expander like modem is >modulator/demodulator). Does anyone know if these products do the >kind of compression that we seek to do in the amateur service with RF >kinds of things? I have never seen an amateur use of these devices >that I can remember. The only thing close was the section in the 1985 >Handbook on amplitude-compandored SSB. Compressors are different from the clippers in purpose. A compressor is an AGC amplifier that responds to *average* speech level using a relatively slow time constant. Clipping is designed to remove momentary voice peaks so that the peak to average ratio of speech is reduced. This latter is important because it relaxes the constraints on the linear amplifiers since they don't need such a high linear peak power response. A compressor's time constant is much too slow to follow peaks, so it doesn't relax the peak to average ratio constraint on the linear amplifier, though it does increase the average demand on the amplifier. The two circuits are typically used *together* to increase "talk power". Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:41:29 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!sun!oucsboss!gw2.att.com!gw1.att.com!fnnews.fnal.gov!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re:RF compression Date: Fri, 12 Jan 96 18:18:16 GMT Lines: 18 Message-ID: <821514490.27821@pinetree.microserve.com> References: <9600128214.AA821482740@mails.imed.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 mack@mails.imed.COM wrote: >There has been a thread here for a few days regarding SSB processing, >vs DSB processing vs split band baseband processing. > >It started me thinking about some products the Philips and others make >called compandors (compression/expander like modem is >modulator/demodulator). Does anyone know if these products do the >kind of compression that we seek to do in the amateur service with RF >kinds of things? The problem with companders and numerous other schemes is that they require "inverse" processing at the receiver. In other words, they're only useful if you're communicating with a station similarly equipped. 73, Jack WB3U From lwbyppp@epix.net Wed Jan 17 14:41:30 1996 Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!grumpy.insinc.net!news.bconnex.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!jaring.my!astoria!phoa Newsgroups: rec.radio.amateur.homebrew Message-ID: <482@astoria.pc.my> Reply-To: phoa@astoria.pc.my (Phoa Kia Teck) From: phoa@astoria.pc.my (Phoa Kia Teck) Date: Tue, 16 Jan 1996 14:24:10 GMT Subject: small quantity extra components Lines: 40 Happy Days, I am a electronics hobbies.In the past I came across some components which I thought other with the same hobby might be interested.I am willing to trade for other components/books or other Electronics items. 1) dualgate mosfet 3SK122 2) small signal bipolar FAC-100X package/pins order code HXTR3101 NPN, Vcbo 30,Vceo 18, Ic 0.05,Pw 600mW,Ft 6000Mhz, hfe 50,Ice 10mA Application: High Freq Amp (RF/VHF/UHF) 3) Balance mixer Diode ring order code 50822830 & 50822831 4) other components!!! Interested kindly email. -- =========================================================== Phoa Kia Teck Postal address: 22 Tramway Road, Email: phoa@astoria.pc.my 10460 Penang. Fax : 04-361984 Malaysia. From lwbyppp@epix.net Wed Jan 17 14:41:31 1996 Path: news.epix.net!news.sprintlink.net!wizard.pn.com!brighton.openmarket.com!decwrl!fred.interval.com!burdick.interval.com!user From: wayne@interval.com (wayne burdick) Newsgroups: rec.radio.amateur.homebrew Subject: state-of-the-art in FSK demodulators for HF TTY? Date: Tue, 16 Jan 1996 15:35:36 -0800 Organization: interval research Lines: 10 Message-ID: NNTP-Posting-Host: burdick.interval.com What are Kantronics and others using for FSK demodulation? XR2211, LMC568, AMD2910? I'd like to find a non-DSP (that is, low-current) device that can really dig out the weak ones on HF TTY (Baudot and ASCII, mostly). Also, I'm looking for a TTY pen-pal/guru who can help with some technical issues in exchange for some no-charge alpha-test hardware. Please respond directly to burdick@interval.com. Thanks, Wayne Burdick, N6KR From lwbyppp@epix.net Wed Jan 17 14:41:32 1996 Path: news.epix.net!news.sprintlink.net!mercury.galstar.com!usenet From: greenac@galaxy.galstar.com Newsgroups: rec.radio.amateur.homebrew Subject: surplus police radar Date: 13 Jan 1996 02:46:13 GMT Organization: Galaxy Star - Northeastern Oklahoma Internet Lines: 14 Message-ID: <4d76dl$pk6@mercury.galstar.com> Reply-To: greenac@galaxy.galstar.com NNTP-Posting-Host: star215.galstar.com X-Newsreader: IBM NewsReader/2 v1.2.5 I am interested in building a perimeter security system using a surplus police radar unit. Any suggestions or leads? KE4GBJ -----BEGIN PGP PUBLIC KEY BLOCK----- Version: 2.6.2 mQCNAy2OQDgAAAEEAL4Qig6kd3+X+u1qBdpbJpYrQMhcKjMac7za/fVLu7jbbB6+ ZApN0WqfpmqFScBCzossOij9rJJeB4AdSJcQ3z2FhkySzU3FblVu4XOTDKpCUCiY KwOyj7xsxuoz0Z7L46LD0sGRu6EIOoFR3fTZeDY4JSw7Kf9QaQITS/daJ/71AAUR tCZLZW5kYWxsIEIuIEdyZWVuIDxncmVlbmFjQGdhbHN0YXIuY29tPg== =Bf5m -----END PGP PUBLIC KEY BLOCK----- From lwbyppp@epix.net Wed Jan 17 14:41:34 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.nuri.net!imci2!newsfeed.internetmci.com!swrinde!tank.news.pipex.net!pipex!demon!ifwtech.demon.co.uk!G3SEK From: Ian White Newsgroups: rec.radio.amateur.homebrew Subject: Re: TS440 and transverter Date: Sat, 13 Jan 1996 17:44:32 +0000 Organization: IFW Technical Services Lines: 72 Distribution: world Message-ID: References: <4d87d4$s57@peippo.cs.tut.fi> NNTP-Posting-Host: ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.10 <9qI82xurdT5+z2vSgnCPFcKgQL> In article <4d87d4$s57@peippo.cs.tut.fi>, Salonen Jukka wrote: >Hello >Have anyboby good tips for cnnecting transverter to >Kenwood TS-440SAT. My transverter is from 28MHz to 50MHz. >The TX-converted needs abt. 0dBm signal and my plan >was to take that 28MHz rf-signal before final unit. Yes, that's the best way - see later. >Another way is take signal from antenna-connector. >Then i must reduce output power of final unit by using >alc-voltage, but theres possibility for damage if my >alc-connector poorly connected: 100w to transverter input == >big cloud of beautiful blue smoke. Bad idea - and not only because of the possibility of losing the ALC signal. Even if there is a DC signal at the ALC socket to reduce the power to the required level, what happens when you apply RF drive? There will be a spike of high power for typically a few milliseconds, until the ALC system reduces the gain in the TX signal path. At best, these spikes will hugely overdrive your transverter and will make you very unpopular on 50MHz! At worst, there will be enough energy to damage your transverter (though probably not enough to make a cloud of blue smoke). >It is also possible to run power to the dummy load and >take signal from it by attenuator, but i dont want to >warm up my hamschack. That's not such a bad solution, maybe. >If i take power before final unit, then i must somehow >"kill" final unit or cut off the signalway from >driver to final. If only i cut signal, is it possible that >the final start to oscillate on its own? This is definitely the best solution. The signal from the TX driver will probably be quite close to the 0dBm level that you need. Use a small two-pole relay inside the transceiver to switch the RF signal at the input to the PA module, and also to break the +12V control line that activates the PA on transmit. If you do not switch the control line, the PA probably will not oscillate, but it will put out a several milliwatts at HF due to signal leakage across the relay. It's nice to activate the HF/transverter changeover from the transverter, so that the relay switches automatically when you power-up the transverter. You can route the DC supply through the TX coaxial cable. If your transceiver has a separate RX input socket, always use that for the transverter. If you use the main SO-239 socket, then sooner or later you *will* transmit 100W into the back-end of the receive converter. More blue smoke... >In ICOM IC-735 is connector for transverter, but i dont >know how it is done in that rig. I believe the IC-735 uses the same coax for both TX and RX, so you would need another TX/RX relay at the output of your transverter. Separate cables for TX and RX are much more versatile. For more information on transverter interfacing, see 'The VHF/UHF DX Book' (now obtainable world-wide from RSGB). 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From lwbyppp@epix.net Wed Jan 17 14:41:35 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!fnnews.fnal.gov!usenet From: "John T. Anderson" Newsgroups: rec.radio.amateur.homebrew Subject: Tubes, anyone? Date: 12 Jan 1996 18:48:29 GMT Organization: JPS Designs Lines: 6 Message-ID: <4d6adt$sfn@fnnews.fnal.gov> NNTP-Posting-Host: jtapc.fnal.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) I have recently acquired a box of tubes, all in cardboard boxes, many new, some used, as part of a bulk buy of other equipment. If anyone is looking to buy a tube, please send me an E-mail with the tube number and I'll check it against my list. If I have it, it's yours for $4.00 a tube plus shipping charges. From lwbyppp@epix.net Wed Jan 17 14:41:35 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsxfer.itd.umich.edu!news2.acs.oakland.edu!detroit.freenet.org!detroit.freenet.org!am024 From: am024@detroit.freenet.org (Robert Thomas Jackson) Newsgroups: rec.radio.amateur.homebrew Subject: tuning in CW/SSB stations w/ AM only radio? Date: 13 Jan 1996 04:55:07 GMT Organization: The Greater Detroit Free-Net Lines: 6 Message-ID: <4d7dvb$m8b@detroit.freenet.org> NNTP-Posting-Host: detroit.freenet.org I seem to remeber a few posts a while back about being able to tune in SSB stations with an AM radio (SW) by just running a 477 khz oscillator near it.... Is this true? Do crystals run down that low? If so I could just build a VXO in that area and be able to adjust it... Has anyone made this work? From lwbyppp@epix.net Wed Jan 17 14:41:37 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr6ip47.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: tuning in CW/SSB stations w/ AM only radio? Date: Sat, 13 Jan 1996 14:56:10 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 22 Message-ID: References: <4d7dvb$m8b@detroit.freenet.org> NNTP-Posting-Host: usr6ip47.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4d7dvb$m8b@detroit.freenet.org> am024@detroit.freenet.org (Robert Thomas Jackson) writes: >From: am024@detroit.freenet.org (Robert Thomas Jackson) >Subject: tuning in CW/SSB stations w/ AM only radio? >Date: 13 Jan 1996 04:55:07 GMT >I seem to remeber a few posts a while back about being able to >tune in SSB stations with an AM radio (SW) by just running a >477 khz oscillator near it.... Is this true? Do crystals run >down that low? If so I could just build a VXO in that area and >be able to adjust it... Has anyone made this work? The usual i-f is 455 KHz. Yes crystals can be had for this frequency. A vcxo would probably have very limited tuning range, however. This scheme will work after a fashion. The AM detector is used to mix the externally supplied carrier (BFO) with the SSB signal. The problems include; getting the BFO to i-f amplitude ratio correct, AGC system overload from the BFO, poor i-f selectivity, etc. Good luck. Wes -- N7WS From lwbyppp@epix.net Wed Jan 17 14:41:38 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: tuning in CW/SSB stations w/ AM only radio? Message-ID: <1996Jan14.182921.12217@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4d7dvb$m8b@detroit.freenet.org> Date: Sun, 14 Jan 1996 18:29:21 GMT Lines: 32 In article <4d7dvb$m8b@detroit.freenet.org> am024@detroit.freenet.org (Robert Thomas Jackson) writes: > >I seem to remeber a few posts a while back about being able to >tune in SSB stations with an AM radio (SW) by just running a >477 khz oscillator near it.... Is this true? Do crystals run >down that low? If so I could just build a VXO in that area and >be able to adjust it... Has anyone made this work? You *can* do this, though actually since the IF is 455 kHz, you'd want your oscillator to operate on either 453 or 457 kHz depending on whether you wanted to receive USB or LSB. There are serious problems with this approach, however. The AM set uses an *envelope* detector while a true SSB receiver will use a *product* detector. With an envelope detector, you have to be *very* careful to have just the right carrier reinsertion amplitude or severe distortion will result. Since the required carrier amplitude varies with the signal strength of the signals received, you need some way to continuously vary this, and that's neither simple nor easy. A much better approach is to build a product detector and go in and add it to the AM receiver in place of the envelope detector (a switch could be used to select the proper detector depending on whether you want to receive AM or SSB). A product detector is not a complex circuit, and can be built up on a small board that can be tucked inside the radio. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:41:39 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.dacom.co.kr!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: VCO power supply noise reduction Message-ID: <1996Jan12.180329.81@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> Date: Fri, 12 Jan 1996 18:03:29 GMT Lines: 27 In article n7ws@azstarnet.com (Wes Stewart) w rites: > >The capacitance multiplier idea may work sometimes, but without *very* carefu l >analysis, you might get into real trouble. The electronic capacitance amplifier always works, but it doesn't excuse one from good electronic practice. It is not a substitute for RF bypassing. In fact, due to the finite gain-bandwidth product of the emitter follower stage, it is mainly a method to reduce *low frequency* ripple in a DC voltage. It does that quite well. Good practice tells us to use *both* a large capacitance and a small value capacitance to bypass 3 terminal regulators. The former for low frequency bypassing, and the latter for high frequency bypassing. The electronically amplified capacitor can allow us to use a physically smaller capacitor for the low frequency bypassing, but it doesn't free us from the need to also supply a high frequency bypass for stages prone to parasitic oscillation, like the above mentioned 3 terminal regulator. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:41:40 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VCO power supply noise reduction Date: Sat, 13 Jan 1996 07:53:39 GMT Organization: Arizona Daily Star - AZSTARNET Lines: 63 Message-ID: <4d7ogd$t51@news.azstarnet.com> References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> <1996Jan12.180329.81@ke4zv.atl.ga.us> NNTP-Posting-Host: usr5ip19.azstarnet.com X-Newsreader: Forte Free Agent 1.0.82 gary@ke4zv.atl.ga.us (Gary Coffman) wrote: >In article n7ws@azstarnet.com (Wes Stewart) writes: >> >>The capacitance multiplier idea may work sometimes, but without *very* caref ul >>analysis, you might get into real trouble. >The electronic capacitance amplifier always works, but it doesn't >excuse one from good electronic practice. It is not a substitute >for RF bypassing. In fact, due to the finite gain-bandwidth product >of the emitter follower stage, it is mainly a method to reduce >*low frequency* ripple in a DC voltage. It does that quite well. >Good practice tells us to use *both* a large capacitance and a >small value capacitance to bypass 3 terminal regulators. The >former for low frequency bypassing, and the latter for high >frequency bypassing. The electronically amplified capacitor >can allow us to use a physically smaller capacitor for the >low frequency bypassing, but it doesn't free us from the need >to also supply a high frequency bypass for stages prone to >parasitic oscillation, like the above mentioned 3 terminal >regulator. >Gary Included in my very careful analysis caveat is the effect of additional capacitance on the emitter of the emitter-follower. Some other thoughts on the "If some are good, more are better" bypassing schemes. One should also consider that most "low-frequency" capacitor types have fairly low self-resonant frequencies (SRFs). Above SRF, the capacitor looks inductive. If this "inductor" is shunted with the appropriate value "high-frequency" bypass, it is possible to get a nice high impedance parallel tuned circuit right where you want the exact opposite. Sprinkle in a few more caps and you can have even more fun. For instance: Some years ago, I was approached by a new college grad who was trying to solve a problem with crosstalk in an i-f amplifier used in a monopulse radar. This consisted of three amplitude and phase-matched amplifiers that used matched everything; FET amplifiers, PIN diodes for AGC and matched Schottky diode bridges for blanking. Each amplifier board was installed in a fully shielded machined housing with feed-thru caps on each power supply and AGC lead. The wires to these caps were daisy-chained from one to the next. The problem was that despite all the precautions, there was inadequate isolation between channels and poor AGC tracking. Weeks were spent looking at device matching, grounding, etc. I suggested to this young man that he locate a grid dip meter and look for resonances in the decoupling circuit. ( His response was, "What's a grid dip meter", but that's another story). Sure enough, there was a resonance between the connecting lead lengths and the capacitors close to the i-f. A change in wire dress and feed-thru capacitor values moved the frequency enough to eleminate the problem. Here was a case where everything was done "right" and we still had a problem. 73, Wes From lwbyppp@epix.net Wed Jan 17 14:41:42 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr3ip36.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VCO power supply noise reduction Date: Sat, 13 Jan 1996 09:22:40 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 16 Message-ID: References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> <1996Jan12.180329.81@ke4zv.atl.ga.us> <4d7ogd$t51@news.azstarnet.com> <1996Jan13.100303.4285@ke4zv.atl.ga.us> NNTP-Posting-Host: usr3ip36.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <1996Jan13.100303.4285@ke4zv.atl.ga.us> gary@ke4zv.atl.ga.us (Gary Coffman) writes: >From: gary@ke4zv.atl.ga.us (Gary Coffman) >Subject: Re: VCO power supply noise reduction >Date: Sat, 13 Jan 1996 10:03:03 GMT [snip] >... A moment's work with a butane soldering iron, >and the suck-out magically disappeared. Case closed, >collect fee. :-) Good work! Except what's an STL? I'm on straight salary, although the way the defense biz is these days, it has a negative slope :(( 73, Wes From lwbyppp@epix.net Wed Jan 17 14:41:43 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: VCO power supply noise reduction Message-ID: <1996Jan13.175747.7610@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> <1996Jan12.180329.81@ke4zv.atl.ga.us> <4d7ogd$t51@news.azstarnet.com> <1996Jan13.100303.4285@ke4zv.atl.ga.us> Date: Sat, 13 Jan 1996 17:57:47 GMT Lines: 22 In article n7ws@azstarnet.com (Wes Stewart) w rites: >In article <1996Jan13.100303.4285@ke4zv.atl.ga.us> gary@ke4zv.atl.ga.us (Gary Coffman) writes: >>... A moment's work with a butane soldering iron, >>and the suck-out magically disappeared. Case closed, >>collect fee. :-) > >Good work! Except what's an STL? Studio to Transmitter Link. >I'm on straight salary, although the way the >defense biz is these days, it has a negative slope :(( Yeah, I heard that. The corporate jungle isn't quite so secure these days. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:41:44 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.netnet.net!news.inc.net!news.sol.net!spool.mu.edu!howland.reston.ans.net!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: VCO power supply noise reduction Message-ID: <1996Jan13.100303.4285@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> <1996Jan12.180329.81@ke4zv.atl.ga.us> <4d7ogd$t51@news.azstarnet.com> Date: Sat, 13 Jan 1996 10:03:03 GMT Lines: 45 In article <4d7ogd$t51@news.azstarnet.com> n7ws@azstarnet.com (Wes Stewart) wr ites: >I suggested to this young man that he locate a grid dip >meter and look for resonances in the decoupling circuit. > ( His response was, "What's a grid dip meter", but that's >another story). Sure enough, there was a resonance between >the connecting lead lengths and the capacitors close to the >i-f. A change in wire dress and feed-thru capacitor values >moved the frequency enough to eleminate the problem. Here >was a case where everything was done "right" and we still >had a problem. Sure, you bet, the non-obvious can bite you if you aren't careful. That doesn't detract from the value of the capacitance multiplier technique in general, however. It just means you have to use it in conjunction with the care you'd use with any other method. Since we're into war stories, I'll relate a recent incident which may highlight overlooking the obvious. I was called in to aid the chief engineer of a local television station with a problem he was having at his transmitter site. The symptom was very low chroma on the transmitted signal. He had swept the transmitter, and its response was fine. He had checked the output of the STL, it was fine. He had bypassed all the terminal equipment between the microwave and the transmitter, no help. He was stumped. I took one look and immediately saw the problem. The cable carrying the signal from the STL to the transmitter was roughly 1/4-wave at 3.58 MHz. Obviously it was acting as a suck-out trap. The only way that could happen would be for a ground to be broken. Sure enough, in the STL frame, the ground trace to the BNC was cracked. Thanks to good plant grounding, no hum was introduced that would have given the problem away, but the coax was acting as a trap for the 3.58. A moment's work with a butane soldering iron, and the suck-out magically disappeared. Case closed, collect fee. :-) Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:41:45 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail From: gmfoster@cpcnet.com (Garry Foster) Subject: Re: VCO power supply noise reduction Message-ID: <1107cc$8f33.2d7@luzskru.cpcnet.com> Date: Tue, 16 Jan 1996 13:18:25 GMT Reply-To: gmfoster@cpcnet.com References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> <1996Jan12.180329.81@ke4zv.atl.ga.us> <4d7ogd$t51@news.azstarnet.com> <1996Jan13.100303.4285@ke4zv.atl.ga.us> X-Newsreader: Forte Free Agent 1.0.82 Lines: 21 n7ws@azstarnet.com (Wes Stewart) wrote: >In article <1996Jan13.100303.4285@ke4zv.atl.ga.us> gary@ke4zv.atl.ga.us (Gary Coffman) writes: >>From: gary@ke4zv.atl.ga.us (Gary Coffman) >>Subject: Re: VCO power supply noise reduction >>Date: Sat, 13 Jan 1996 10:03:03 GMT >[snip] >>... A moment's work with a butane soldering iron, >>and the suck-out magically disappeared. Case closed, >>collect fee. :-) >Good work! Except what's an STL? >I'm on straight salary, although the way the >defense biz is these days, it has a negative slope :(( >73, Wes From lwbyppp@epix.net Wed Jan 17 14:41:47 1996 Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Zack Lau Newsgroups: rec.radio.amateur.homebrew Subject: Re: VCO power supply noise reduction Date: Tue, 16 Jan 1996 10:00:51 -0800 Organization: American Radio Relay League Lines: 15 Message-ID: <30FBE7D3.69B5@arrl.org> References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> <1996Jan12.180329.81@ke4zv.atl.ga.us> <4d7ogd$t51@news.azstarnet.com> NNTP-Posting-Host: zlau.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win16; I) Wes Stewart wrote: > i-f. A change in wire dress and feed-thru capacitor values > moved the frequency enough to eleminate the problem. Here > was a case where everything was done "right" and we still > had a problem. How would you attack the problem in a "DC to daylight" amplifier with no "safe frequencies" to move the resonances? I've been known to use resistive loading in the bias lines of low power amplifiers, but this isn't always practical. Zack KH6CP/1 From lwbyppp@epix.net Wed Jan 17 14:41:48 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr7ip10.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VCO power supply noise reduction Date: Tue, 16 Jan 1996 19:59:27 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 48 Message-ID: References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> <1996Jan12.180329.81@ke4zv.atl.ga.us> <4d7ogd$t51@news.azstarnet.com> <30FBE7D3.69B5@arrl.org> NNTP-Posting-Host: usr7ip10.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <30FBE7D3.69B5@arrl.org> Zack Lau writes: >From: Zack Lau >Subject: Re: VCO power supply noise reduction >Date: Tue, 16 Jan 1996 10:00:51 -0800 >Wes Stewart wrote: >> i-f. A change in wire dress and feed-thru capacitor values >> moved the frequency enough to eleminate the problem. Here >> was a case where everything was done "right" and we still >> had a problem. >How would you attack the problem in a "DC to daylight" >amplifier with no "safe frequencies" to move the >resonances? That's a lot of octaves! (Or decades even). >I've been known to use resistive loading in the bias >lines of low power amplifiers, but this isn't always >practical. Well, as you already know, ferrites are probably the best answer. You can get a |Z| real (resistive) part that is useful over a fairly wide frequency range while not presenting a DC resistance. Even if there are resonances somewhere, the Q is lowered and this often helps. The point I was trying to make was that the shotgun and more-the-merrier approaches often work, but not always. In ham stuff, this is often OK, because we build only one of something and can always fiddle with it. The problems arise when you want to build a bunch of something and normal tolerances bite you. As designer for the masses, you must be aware of this. Even in aerospace, we historically have thrown money at things by screening hardware (as the VCO vendor had done with the regulator chip, BTW) to improve yield and reduce variability. Now days, we are being forced to use Commercial-Off-The Shelf (COTS) stuff. This is for two reasons: one, the customer (that's you, Taxpayer) doesn't want the finest anymore and 2, no vendors want to put up with the paperwork necessary to build a handfull of parts, when they can build millions for other people. This scares the hell out of me, but nobody asked me. >Zack KH6CP/1 Regards, Wes -- N7WS From lwbyppp@epix.net Wed Jan 17 14:41:49 1996 Path: news.epix.net!news.sprintlink.net!news2.whytel.com!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in2.uu.net!news.ultranet.com!webb From: webb@ma.ultranet.com (Spencer & Chandra Webb) Newsgroups: rec.radio.amateur.homebrew Subject: Wanted: Repair Tech for SINGER FM-10CS Date: Mon, 15 Jan 96 03:35:03 GMT Organization: UltraNet Communications, Inc. Lines: 9 Message-ID: <4dcmas$jld@caesar.ultra.net> NNTP-Posting-Host: webb.ultranet.com X-Newsreader: News Xpress Version 1.0 Beta #4 If you know what a SINGER FM-10CS is, and you have repaired them before, I would like to speak with you. I have one that is need of some care. It is relatively recently calibrated, but has developed problems. I would like to use this gear in amateur work. E-mail to webb@ultranet.com -Spencer WA2BSR From lwbyppp@epix.net Wed Jan 17 14:41:50 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!brighton.openmarket.com!wizard.pn.com!news.zeitgeist.net!oracle.damerica.net!usenet From: daustin@community.net (Dave Austin) Newsgroups: rec.radio.amateur.homebrew Subject: XLR balanced to non ckt. is it easy ?? Date: 14 Jan 1996 19:06:03 GMT Organization: community.net Lines: 7 Message-ID: <4dbk6s$h0q@oracle.damerica.net> NNTP-Posting-Host: n110.napa.community.net X-Newsreader: WinVN 0.92.6+ Need to convert XLR (cannon) balanced inputs to standard line input. Do I j ust put one end to ground and use the other? XLR is a balanced audio input (for lowe r noise) Not sure of Z in ckt. Thanks Dave From lwbyppp@epix.net Wed Jan 17 14:41:51 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!oracle.damerica.net!usenet From: daustin@community.net (Dave Austin) Newsgroups: rec.radio.amateur.homebrew Subject: Re: XLR balanced to non ckt. is it easy ?? Date: 15 Jan 1996 06:23:12 GMT Organization: community.net Lines: 29 Message-ID: <4dcrsg$9fk@oracle.damerica.net> References: <4dbk6s$h0q@oracle.damerica.net> NNTP-Posting-Host: n118.napa.community.net X-Newsreader: WinVN 0.92.6+ >With any transformer-input circuit (many pro balanced ins still use >transformers), you should indeed ground one side of the balanced line, and cut cut > do you no good in some cases. > > >: John Seboldt rohrwerk@netcom.com / CW: It don't mean a thing >: K0JD... Minneapolis, MN / if it ain't got that swing! >: My R2/T2 station described in / Di dah, di dah, di dah, di dah... >> http://www.lehigh.edu/lists/qrp-l/k0jd/index.html < > Thanks. I found out much about XLR in searching the net. Thanks for your info. Found some good ref material form RANE company on the net. I have tried some things and below is what works ok. Xfmrs are not needed fo r high level stuff. Just mikes and other low level devices. The item under repair is a Sony DAT deck. 2300. Now I some in and outs to start my repair. Thanks much. Dave KD6BYV From lwbyppp@epix.net Wed Jan 17 14:41:52 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: XLR balanced to non ckt. is it easy ?? Message-ID: <1996Jan15.154210.16822@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4dbk6s$h0q@oracle.damerica.net> Date: Mon, 15 Jan 1996 15:42:10 GMT Lines: 28 In article <4dbk6s$h0q@oracle.damerica.net> daustin@community.net (Dave Austin ) writes: >Need to convert XLR (cannon) balanced inputs to standard line input. Do I just put >one end to ground and use the other? XLR is a balanced audio input (for low er noise) >Not sure of Z in ckt. Balanced XLR *is* standard, it's those funny phone jacks that are non-standard. :-) For microphone level (-55 dbm), the impedance is 150 ohms. For line level (used to be +8 dbm but the industry is switching to +4 dbm) the impedance is 600 ohms. You don't want to destroy the system balance by grounding one of the pair. You'll have hum pickup and other nasties. Standard transformer adaptors are available, XLR on one end, transformer in the middle, and 1/4 inch phone plug on the other. (Or sexed vice versa for use on the other end of the line.) If you're going into a high impedance unbalanced input, there are adaptors with a suitable step up ratio in the transformer, otherwise the transformer is just 1:1. It's a balun! Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:41:53 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: XLR balanced to non ckt. is it easy ?? Message-ID: <1996Jan15.161837.17011@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4dbk6s$h0q@oracle.damerica.net> Date: Mon, 15 Jan 1996 16:18:37 GMT Lines: 50 In article rohrwerk@netcom.com (John Seboldt) writes: >Surprisingly, you may not actually have a balanced input even with XLR >connectors -- I have a Yamaha board at work like this where the balanced >transformers are an *option*, and not installed. > >If it's NOT a transformer input, you should do what gives you best >results: just feed from ground to one of the balanced legs. In this >case, there's an active differential input, and grounding one side will >do you no good in some cases. That's because the differential pair input *is* balanced. The only reason you'd add the optional transformers in this case would be if you needed to break the DC continuity between the board and a distant piece of equipment that may not share common power (otherwise you'd get a nasty ground loop), or because the distant equipment may need phantom power fed down the cable. Unbalanced inputs have one side grounded *internally*, balanced inputs don't. The presence or absence of a transformer doesn't necessarily determine whether you're dealing with balanced or unbalanced audio. Pin 1 of the XLR is *shield* ground. You may not want to connect this at both ends, even in balanced systems, because it can cause a frame to frame ground loop. Grounding it only at the console end (or better at the patch field) is usually best. Pins 2 and 3 are the hot balanced pair, which is which doesn't matter except for phasing. Traditionally, pin 2 gets the red wire and pin 3 gets the black, but as long as you wire both ends the same, it won't matter (until somebody else has to come along later and repair one end, then he'll probably wire it standard and you'll have a phase reversal). With the 1/4 inch plugs, the tip is always hot and the ring is ground (which doubles as the shield connection). Obviously you can't isolate ground with this type connection, and ground loops, hum pickup, and RF pickup (at a radio station) will be commmon and infuriating problems. The solution, of course, is to insert a 1:1 transformer at the unbalanced end *before* the equipment connection. This offers DC isolation, breaking the ground loop and allowing you to single point the shield. These *baluns* are standard off the shelf items from any professional audio supplier. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Wed Jan 17 14:41:55 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!hodes.com!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!rohrwerk From: rohrwerk@netcom.com (John Seboldt) Subject: Re: XLR balanced to non ckt. is it easy ?? Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: <4dbk6s$h0q@oracle.damerica.net> <1996Jan15.154210.16822@ke4zv.atl.ga.us> Date: Mon, 15 Jan 1996 19:31:22 GMT Lines: 19 Sender: rohrwerk@netcom9.netcom.com gary@ke4zv.atl.ga.us (Gary Coffman) writes: >For microphone level (-55 dbm), the impedance is 150 ohms. For line >level (used to be +8 dbm but the industry is switching to +4 dbm) >the impedance is 600 ohms. Not quite, Gary... in the old days it *was* a matched 600 ohm ideal... today it's "lowest possible source impedance, highest possible load impedance" for balanced line level. Leads to a lot of confusion when defining dBm in audio practice, to say the least. But this ain't ham homebrew, unless we're talking' interfacing old radio consoles to AM transmitters modified for 160 meters ... : John Seboldt rohrwerk@netcom.com / CW: It don't mean a thing : K0JD... Minneapolis, MN / if it ain't got that swing! : My R2/T2 station described in / Di dah, di dah, di dah, di dah... > http://www.lehigh.edu/lists/qrp-l/k0jd/index.html < From lwbyppp@epix.net Wed Jan 17 14:41:55 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.nrv.net!usenet From: miker@nrv.net (Mike) Newsgroups: rec.radio.amateur.homebrew Subject: Re: XLR balanced to non ckt. is it easy ?? Date: 15 Jan 1996 18:01:45 GMT Organization: NRVnet Inc. Lines: 16 Message-ID: <4de4q9$u1t@kirk.nrv.net> References: <4dbk6s$h0q@oracle.damerica.net> NNTP-Posting-Host: port-15.server1.nrv.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 In article <4dbk6s$h0q@oracle.damerica.net>, daustin@community.net says... > >Need to convert XLR (cannon) balanced inputs to standard line input. Do I just put >one end to ground and use the other? XLR is a balanced audio input (for lower noise) >Not sure of Z in ckt. > >Thanks > >Dave I use the Henry Matchbox that converts it both ways although you can build one quite easy with opamps. From lwbyppp@epix.net Wed Jan 17 14:41:56 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!oracle.damerica.net!usenet From: daustin@community.net (Dave Austin) Newsgroups: rec.radio.amateur.homebrew Subject: Re: XLR balanced to non ckt. is it easy ?? IT IS. Date: 15 Jan 1996 06:27:44 GMT Organization: community.net Lines: 16 Message-ID: <4dcs50$9fk@oracle.damerica.net> References: <4dbk6s$h0q@oracle.damerica.net> NNTP-Posting-Host: n118.napa.community.net X-Newsreader: WinVN 0.92.6+ Woops , forgot to list what works. RCA unbalanced output (high level, standard stereo stuff ) to XLR 3 wire balanced input device. (DAT deck in this case) RCA XLR center pin ------------------------ pin 2 outside pin ------------------------ pin 3 ---shield of wire -- pin 1 Dave KD6BYV From lwbyppp@epix.net Wed Jan 17 14:41:57 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci2!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: pfzouave@aol.com (PFZouave) Newsgroups: rec.radio.amateur.homebrew Subject: Xpert Needed:Zener Diodes --- Can you make what you dont have? Date: 11 Jan 1996 21:56:00 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 36 Sender: root@newsbf02.news.aol.com Message-ID: <4d4ik0$po5@newsbf02.news.aol.com> Reply-To: pfzouave@aol.com (PFZouave) NNTP-Posting-Host: newsbf02.mail.aol.com Question: Im looking at a reset circuit (suggested by Microchip, the manufacturer of the 16C74 microcontroller) which is build around a PNP transistor, three resistors, and a zener diode. Basically, the zener is set up with a series resistor to form a voltage reference of sorts. It feeds the transistor, which in turn can activate the reset pin on the processor. The idea is this: If Vsuppy falls below the zener voltage + 0.7 volts (drop across the transistor, I presume), then the transistor will shut off and a pull-down resistor will yank the reset line to ground and reset the processor. So far so good. My problem is this: The processor is spec'd to work down to 2.5 volts. If I add a safety margin and say the minimum before reset should be 3.o volts, 3 - 0.7 leaves me with a required zener voltage of 2.3 volts. I have several catalogs laying around here, and can't find any zeners less than 3 volts. Can I synthesize the breakdown characteristics of a reverse biased 2.3 volt zener by replacing it with three *forward* biased switching diodes (like the 1n4148?). If the drop across each switching diode is, say 0.7 or 0.8 volts, then the total drop across the string should be 2.4 ----- very close to the zener voltage id like to see. Will this work? What practical problems are there with this approach? How consisent is the forward drop of a particular line of switching diodes from batch to batch? Please email any thoughts you might have, as my access to newsgroups is often less than reliable. Pete /=====================================================/ / PFZouave@aol.com / / The absurdity of a claim is not a valid measure of its probability / /=====================================================/ From lwbyppp@epix.net Wed Jan 17 14:41:58 1996 Path: news.epix.net!news.sprintlink.net!hideout.emanon.net!news.genesis.net!news.atlantic.net!netaxs.com!news.cais.net!primus.ac.net!news.serv.net!news.alt.net!news1.alt.net!news.exodus.net!news.internetMCI.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have? Date: 15 Jan 1996 23:04:39 GMT Organization: Hewlett Packard Corvallis Site Lines: 20 Message-ID: <4demi7$f0q@hpcvsnz.cv.hp.com> References: NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Mark Zenier (mzenier@netcom.com) wrote: : The TL431 shunt regulator IC (also called a programmable zener) is : good down to 2.5 volts. It doesn't like much parallel capacitance, : but otherwise looks like a zener. I recently discovered the "It doesn't like much parallel capacitance" thing, but it's really that it doesn't like a moderate amount of capacitance: it's stable for large capacitance (4.7uF and above) and small (4.7nF and below) but potentially not in between. The region of stability is shown in the TI databook. It's least stable for lowest voltage (Vka = Vref) and low currents (the capacitances given above), and unstable at 15 volts only at low current from about .06uF to 1uF. Note that type of capacitor and lead lengths (parasitic inductance and resistance) may affect the region of stability. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Wed Jan 17 14:42:00 1996 Path: news.epix.net!news.sprintlink.net!news.genesis.net!news.atlantic.net!netaxs.com!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews From: dakeltie@ix.netcom.com(Dale A. Keltie ) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have? Date: 15 Jan 1996 22:16:33 GMT Organization: Netcom Lines: 37 Message-ID: <4dejo1$s7s@cloner2.ix.netcom.com> References: <4d4ik0$po5@newsbf02.news.aol.com> <4d4pdu$bn@daffy.sb.west.net> NNTP-Posting-Host: ix-ren-nv1-12.ix.netcom.com X-NETCOM-Date: Mon Jan 15 2:16:33 PM PST 1996 In <4d4pdu$bn@daffy.sb.west.net> mark@reson.com (qrk) writes: > >pfzouave@aol.com (PFZouave) wrote: > >>Question: Im looking at a reset circuit (suggested by Microchip, the >>manufacturer of the 16C74 microcontroller) which is build around a PNP >>transistor, three resistors, and a zener diode. Basically, the zener is >>set up with a series resistor to form a voltage reference of sorts. It >>feeds the transistor, which in turn can activate the reset pin on the >>processor. [stuff deleted] > >Your best bet for a reliable reset circuit is something like the Maxim >MAX704T/S/R or the reset chip. The T/S/R suffix is the reset voltage >(3.06, 2.91, 2.61 respectively). Don't use the plain MAX704, it >resets at 4.65 volts. The one you describe has problems with temp >drift and good reliable operation when conditions become marginal or >you have a funky power supply during turn-on. Maxim and others have a >whole bunch of microprocessor reset circuits which work better than >any of the popular discrete designs. I think the cost is about $5.00 >each. > > > >- >Mark Chun | mark@reson.com | Santa Barbara, CA > Another possible source for these types of circuits is: Dallas Semiconductor 4350 Beltwood Pkwy. S. Tel: 214-450-0400 Regards, Dale From lwbyppp@epix.net Wed Jan 17 14:42:01 1996 Path: news.epix.net!news.sprintlink.net!noc.netcom.net!gate.centigram.com!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!howland.reston.ans.net!newsfeed.internetmci.com!news.west.net!usenet From: mark@reson.com (qrk) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have? Date: Fri, 12 Jan 1996 04:53:24 GMT Organization: Marginal Lines: 24 Message-ID: <4d4pdu$bn@daffy.sb.west.net> References: <4d4ik0$po5@newsbf02.news.aol.com> NNTP-Posting-Host: term2-26.sb.west.net X-Newsreader: Forte Free Agent 1.0.82 pfzouave@aol.com (PFZouave) wrote: >Question: Im looking at a reset circuit (suggested by Microchip, the >manufacturer of the 16C74 microcontroller) which is build around a PNP >transistor, three resistors, and a zener diode. Basically, the zener is >set up with a series resistor to form a voltage reference of sorts. It >feeds the transistor, which in turn can activate the reset pin on the >processor. [stuff deleted] Your best bet for a reliable reset circuit is something like the Maxim MAX704T/S/R or the reset chip. The T/S/R suffix is the reset voltage (3.06, 2.91, 2.61 respectively). Don't use the plain MAX704, it resets at 4.65 volts. The one you describe has problems with temp drift and good reliable operation when conditions become marginal or you have a funky power supply during turn-on. Maxim and others have a whole bunch of microprocessor reset circuits which work better than any of the popular discrete designs. I think the cost is about $5.00 each. - Mark Chun | mark@reson.com | Santa Barbara, CA From lwbyppp@epix.net Wed Jan 17 14:42:02 1996 Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!newsfeed.internetmci.com!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have? Date: 17 Jan 1996 03:10:27 GMT Organization: Hewlett-Packard Lines: 20 Message-ID: <4dhpb3$eej@hpscit.sc.hp.com> References: <4d4ik0$po5@newsbf02.news.aol.com> NNTP-Posting-Host: hpscrj.scd.hp.com In article , Mark Zenier wrote: >in <4d4ik0$po5@newsbf02.news.aol.com>, PFZouave wrote: >: My problem is this: The processor is spec'd to work down to 2.5 volts. If >: I add a safety margin and say the minimum before reset should be 3.o >: volts, 3 - 0.7 leaves me with a required zener voltage of 2.3 volts. I >: have several catalogs laying around here, and can't find any zeners less >: than 3 volts. > >The TL431 shunt regulator IC (also called a programmable zener) is >good down to 2.5 volts. It doesn't like much parallel capacitance, >but otherwise looks like a zener. Good suggestion. Let me add that the capacitance requirement is actually EITHER less than 1000 pF. OR MORE than 4.7 uF., according to the data sheet. I found that the 4.7 uF. MUST be a tantalum not a ceramic, or it will oscillate. It depends on the ESR of the tantalum for stability. Rick Karlquist N6RK rkarlqu@scd.hp.com From lwbyppp@epix.net Mon Jan 22 19:57:25 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news2.acs.oakland.edu!newshub.gmr.com!news.delcoelect.com!usenet From: Tom Pfaffenbach Newsgroups: rec.radio.amateur.homebrew Subject: Re: Balun Help Date: 22 Jan 1996 16:02:57 GMT Organization: Delco Electronics Lines: 5 Distribution: usa Message-ID: <4e0cfh$6la@kocrsv08.delcoelect.com> References: <199601191835.MAA19521@tri.net> NNTP-Posting-Host: koprpc05.delcoelect.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1 (Windows; I; 16bit) To: stoskopf@tri.NET Try 11 trifilar turns #14 formvar or TFE insulated wire. Connect the turns in series. Ground at the far end of the first turn. Balanced output at bottom and 2/3 tap. Unbalanc ed feed at top (to ground). Generally a 2.4 " dia Q-2 material 1/2 " thick is used, but your 1.12 5" thick material probably won't saturate at 1000w. From lwbyppp@epix.net Mon Jan 22 19:57:28 1996 Path: news.epix.net!news.sprintlink.net!chewy.vcx.net!uunet!in1.uu.net!bashful.einsteininfo.com!bashful.einsteininfo.com!not-for-mail From: steps@bashful.einsteininfo.com Newsgroups: rec.radio.amateur.homebrew Subject: dummy load? Date: 17 Jan 1996 12:04:26 -0500 Organization: # Sirius Cybernetics, Sirius City branch Lines: 5 Message-ID: <4dja6q$h4s@bashful.einsteininfo.com> NNTP-Posting-Host: bashful.einsteininfo.com X-Newsreader: TIN [version 1.2 PL2] Could someone either send me,or direct me to a site where I might find plans to construct an inexpensive dummy load (50 ohm).I don't need it to handle more than 10 to 15 watts maximum.Thanx! steps@bashful.einsteininfo.com From lwbyppp@epix.net Mon Jan 22 19:57:29 1996 Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!uwvax!frankensun.altair.com!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet From: Jim Potter Newsgroups: rec.radio.amateur.homebrew Subject: Re: dummy load? Date: Thu, 18 Jan 1996 00:19:14 -0700 Organization: JP Accelerator Works, Inc. Lines: 36 Message-ID: <30FDF472.663D@jpaw.com> References: <4dja6q$h4s@bashful.einsteininfo.com> NNTP-Posting-Host: dial130.roadrunner.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (WinNT; I) To: steps@bashful.einsteininfo.com steps@bashful.einsteininfo.com wrote: > > Could someone either send me,or direct me to a site where I might find plans > to construct an inexpensive dummy load (50 ohm).I don't need it to handle > more than 10 to 15 watts maximum.Thanx! > steps@bashful.einsteininfo.com Cheap depends on your ability to find resistors. I once made a dummy load by paralleling thirty 1500 ohm 2 W carbon composition resistors. I connected 10 in parallel side-by-side with a 12 guage (or so) wire along the grounded side. I then took three sets of 10 and connected them altogether, in a "Y" configuration, along a common #12 wire which went to the center of a coax connector. The three wires at the other end of the resistors were connected to the body of the connector. It worke OK at 50 MHz, although it had some noticeable reactive component at the frequency. These resistor now run $2.69 each with minimum purchase 25 from Newark. So if you go this route it will only be economical if you can find a cheap source of resistors. Of course you can use differing numbers of resistors, different resistance, differenct wattage. The point is if you need a load at 50 MHz or below you can get away with a lot. Probably a smaller one might even be adequate on 144 MHz. Or, find a Heath Cantenna somewhere. They were the size of a 1 gallon paint can and would meet your requirements without the oil, depending on what frequency your are planning to use. de K9GXC, Jim -- James M. Potter, President E-mail: jpotter@jpaw.com JP Accelerator Works, Inc. URL: http://www.jpaw.com/jpaw/ 2245 47th Street Voice: 505-662-5804 Los Alamos, NM 87544-1604 FAX: 505-662-5210 From lwbyppp@epix.net Mon Jan 22 19:57:30 1996 Path: news.epix.net!news.sprintlink.net!news.dorsai.org!news.ilx.com!psinntp!psinntp!psinntp!howland.reston.ans.net!newsfeed.internetmci.com!news.wco.com!news From: acopac@hope.netwizards.net Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Re: Electonic flash unit problem Date: Sun, 14 Jan 1996 16:16:17 GMT Organization: West Coast Online's News Server - Not responsible for content Lines: 30 Message-ID: <4dba3d$a9g@news.wco.com> References: <4d3541$nej@olivea.ATC.Olivetti.Com> NNTP-Posting-Host: 206.99.115.35 X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.amateur.misc:97074 rec.radio.amateur.homebrew:12810 Its possible the tube is bad - However are you sure the trigger is operating - the you might see if you can draw an arc from the trigger transformer (4kV) if you trigger the flash. Replacement tubes are usually available - but not cheap. In the US Mouser Electronics sells them... Also you might want to list on the rec.photo.misc ----- or other photo groups Noland archive@flash.ATC.Olivetti.Com (DCG Mktg Docmnt (Ivrea)) wrote: > > >I have an electronic flash unit purchased in 1970. After being unused for >many years, I find that now it does not function correctly. The lamp is >powered by 250 Vcc and the flash is triggered by a pulse. I have >checked the capacitor, which is in good condition. Has the lamp failed >through again?? Does anybody have the answer? > > > > > > > > From lwbyppp@epix.net Mon Jan 22 19:57:31 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!wizard.pn.com!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: jeffa@ix.netcom.com(Jeff Anderson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Grapefruit powered XMTR? Date: 17 Jan 1996 14:24:10 GMT Organization: Netcom Lines: 25 Message-ID: <4dj0qa$78a@ixnews5.ix.netcom.com> References: <1996Jan16.194742.28225@llyene.jpl.nasa.gov> <4di8v6$d37@maureen.teleport.com> NNTP-Posting-Host: pax-ca23-16.ix.netcom.com X-NETCOM-Date: Wed Jan 17 6:24:10 AM PST 1996 In <4di8v6$d37@maureen.teleport.com> w7el@teleport.com (Roy Lewallen) writes: > >Try "Lemonized QSO" by Bob Culter, N7FKI and Wes Hayward, W7ZOI >in QST, March 1992, p. 18. I dunno if I'd power it with a >grapefruit, though, it might put the squeeze on the transistor. > >73, >Roy Lewallen, W7EL > Then again, for long-winded QSO's I'd use a grapefruit. After all, it's well known that a grapefruit will supply more juice... >(Yes, I know what I'm probably starting here, and apologize in >advance. . .) > Apology insufficient. Please send money. - Jeff, WA6AHL From lwbyppp@epix.net Mon Jan 22 19:57:33 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!usc!ccnet.com!rahul.net!a2i!news.clark.net!starport!brian.carling Distribution: world Newsgroups: rec.radio.amateur.homebrew From: brian.carling@acenet.com (Brian Carling) References: <822129363snz@lfheller.demon.co.uk> Date: Sun, 21 Jan 1996 07:25:00 -0500 Organization: =ACE= ONLINE (301)942-2218 Subject: Re: Help needed repairing Message-ID: <2a6.7820.546@acenet.com> Lines: 46 Newsgroups: rec.radio.amateur.homebrew From: brian.carling@acenet.com.us "mail sometimes bounces here, please resend if needed!" Hello Leon. Perchance could you supply me the address and phone number(s) for Cricklewood Electronics? R.S.V.P. I keep a list of US/Canada/UK suppliers of parts and kits for amateur radio called MEGALIST.TXT and I could add them to the list. If you can't find it locally, try these: Updated copies downloadable from BBSes at: (301) 942-2218 (301) 417-6952, (301) 590-2981, (202) 619-1494, (202) 208-7679 FTP: lujce@hooch.cc.lehigh.edu FTP: adams@chuck.dallas.sgi.com WWW: http://qrp.cc.nd.edu/QRP-L/index.html URL: http://www.nd.edu/~shideg/ LE>> I am not well versed in electronics repair and am hoping that someone can LE>> put in the right direction. Should these transistors be replaced? If so, LE>> would they be commonly available here in Canada. (OC171) If not, then LE>> what would be a suitable substitution? I've noticed that these LE>> transistors have 4 leads. The fourth is labeled "S" and always goes to LE>> ground. Is this akin to grounding the case of the transistor? LE>> Looking forward to hearing from anyone who may be able to help. LE>> Please email. Thanks in advance. LE>> Paul. LE>The OC171 was made by Mullard (part of Philips) something like 30 years LE>ago. I used the similar OC170 in a simple reflex Rx in the 60s. You'll LE>probably have trouble finding them in Canada. If you need to replace LE>them, I can think of one or two places here in the UK that *might* have LE>them, like Cricklewood Electronics. The 170 was an RF amp, and the 171 an LE>IF amp, as I recall. Both were germanium, of course. The 4th lead was a LE>screen and was connected to the case. LE>73, Leon LE>-- LE>Leon Heller, G1HSM | "Do not adjust your mind, there is LE>E-mail leon@lfheller.demon.co.uk | a fault in reality": on a wall LE>Phone: +44 (0)1734 266679 | many years ago in Oxford. I am G3XLQ/W3 (!) brian.carling@acenet.com --- þ SLMR 2.1a þ From lwbyppp@epix.net Mon Jan 22 19:57:34 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: 16 Jan 1996 10:41:21 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 17 Sender: root@newsbf02.news.aol.com Message-ID: <4dggv1$3vm@newsbf02.news.aol.com> References: NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Gary, >As I noted, core saturation plays no part with 1 kV/nS pulses. They >*capacitively* couple between the transformer windings, unless you >use a ferroresonant or Faraday shielded transformer of course. Note >that's *nanosecond* not *millisecond*. Transients almost by definition >are *very* fast pulses. They usually don't pack a lot of energy (which >is good or little bitty MOVs would be of no value), and don't do the >damage themselves in line operated equipment. What they do is serve as >junction puncturers or "ignition" sources. It's the ordinary line current >that then does the damage by following the path created by the transient. > If the pulse is capacitively coupled, how does the turns ratio step it up? 73 Tom From lwbyppp@epix.net Mon Jan 22 19:57:35 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: 17 Jan 1996 14:09:21 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 12 Sender: root@newsbf02.news.aol.com Message-ID: <4djhh1$c9u@newsbf02.news.aol.com> References: <4dgqha$g86@maureen.teleport.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <1996Jan17.031054.24105@ke4zv.atl.ga.us>, gary@ke4zv.atl.ga.us (Gary Coffman) writes: >It doesn't, nor does it need to, a megavolt transient is quite sufficient >in itself. > > How does a megavolt ultra short rise time transient make it past the line bypass caps, terminal blocks outlet, fuse box and so on? 73 Tom From lwbyppp@epix.net Mon Jan 22 19:57:36 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!news.cinenet.net!news.cais.net!primus.ac.net!news.serv.net!solaris.cc.vt.edu!newsfeed.internetmci.com!in2.uu.net!csnews!coopnews.coop.net!news.den.mmc.com!NewsWatcher!user From: thomas.g.booth@den.mmc.com (Booth, Thomas G) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Followup-To: rec.radio.amateur.homebrew Date: 16 Jan 1996 03:03:45 GMT Organization: A Turbulent One Lines: 9 Distribution: usa Message-ID: References: <4d96v0$rkm@ixnews8.ix.netcom.com> <4danp1$kkc@newsbf02.news.aol.com> <1996Jan15.152809.16615@ke4zv.atl.ga.us> NNTP-Posting-Host: 160.205.101.24 FWIW the trademark for TransZorb (this is the correct spelling and use of upper and lower case characters) is held by General Semiconductor Industries, Inc. An alternate source of silicon transient voltage suppressors is Microsemi Corporation - the trademark for their product line is TAZ. TGB \\ The opinions expressed herein are my own. // From lwbyppp@epix.net Mon Jan 22 19:57:37 1996 Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!dsinc!newsfeed.pitt.edu!gatech!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: How to add battery capacity to a vehicle? Date: Tue, 16 Jan 96 19:33:11 GMT Organization: TSE Systems Lines: 40 Message-ID: <4dgu7i$71@solaris.cc.vt.edu> References: NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 In article , Jay Wicklund wrote: [...] >When I bought my truck it had two batteries installed as part of >a "camper" package. One battery is strictly for the engine, the >second battery powers the camper and is disconnected from the >truck battery when the engine is off. When the engine is >running both batteries charge. There is a module that controls >the interconnect between the batteries; I don't know if it is >any more than a simple relay. It may or maynot include some >form of current limiting. The most common method of doing this is a device called a "battery isolator", consisting of two power diodes on a heat sink. It has three terminals: Alternator, Battery 1, and Battery 2. The internal wiring is: |---->|---- Battery 1 Alternator -----| |---->|---- Battery 2 When the engine is not running, the two batteries are isolated since one or both of the diodes will be reverse-biased. Thus the auxilary battery can be run down without drawing any current from the engine battery. When the engine is running, power generated by the alternator forward-biases the diodes and charges both batteries, giving preference to the one with a lower voltage. Eventually, both batteries will charge to the same voltage. Usually the vehicle's voltage regulator remains connected to the Battery 1 circuit, so the voltage at that battery is regulated, and the alternator output voltage is able to rise to overcome the drop in the diode. The voltage available at Battery 2 is inherently also regulated, since the voltage drop in the two forward-biased diodes is about the same. Battery isolators are sold in different amperage ratings, or you can homebrew one from two suitable diodes and a heat sink. The diodes need to be rated for the full output of the vehicle's alternator, which can be more than 100 A in some cases. -Mike KD4QDM From lwbyppp@epix.net Mon Jan 22 19:57:38 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!peer-news.britain.eu.net!sunsite.doc.ic.ac.uk!qmw!orac.sunderland.ac.uk!usenet From: JURGEN.FECHNER@Sunderland.Ac.UK (JURGEN FECHNER) Newsgroups: rec.radio.amateur.homebrew Subject: Info needed on how to design UHF coils using pcb tracks instead of wire Date: 22 Jan 1996 11:52:31 GMT Organization: University of Sunderland Lines: 5 Message-ID: <4dvtpv$8tc@orac.sunderland.ac.uk> NNTP-Posting-Host: j_fechner_home.sunderland.ac.uk Mime-Version: 1.0 X-Newsreader: WinVN 0.99.4 Is there anyone who can help me with some information about printed inductors? Jurgen From lwbyppp@epix.net Mon Jan 22 19:57:39 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI ) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need 10 meter conversion info for Cobra 148gtl Date: 18 Jan 1996 03:33:20 GMT Organization: Netcom Lines: 7 Message-ID: <4dkf20$dju@cloner3.netcom.com> References: <4djt6j$32v$3@mhafn.production.compuserve.com> NNTP-Posting-Host: ix-pon-mi3-11.ix.netcom.com X-NETCOM-Date: Wed Jan 17 7:33:20 PM PST 1996 There is a guy in AZ somewhere that advertises a book called CB to 10 mtrs, I see the ad alot. I wrote for a catalog of his offerings about a year ago and he seemed to have alot of conversion information. Check the ham mags for his ad. 73, Tim From lwbyppp@epix.net Mon Jan 22 19:57:41 1996 Path: news.epix.net!news.sprintlink.net!news.wwa.com!news From: Gary KF9CM turtle@wwa.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need AA-size dummy cell/bridge Date: 18 Jan 1996 11:37:09 GMT Organization: WorldWide Access (tm) - Chicagoland Internet Services (http://www.wwa.com) Lines: 17 Message-ID: <4dlbd5$45@kirin.wwa.com> References: <4d2v4v$rdo@newsbf02.news.aol.com> NNTP-Posting-Host: vh1-054.wwa.com X-Newsreader: AIR News 3.X (SPRY, Inc.) > krin135@aol.com (Krin135) writes: > Radio Shack used to include two dummy bridges with each of its CB walkie > talkies just for this purpose. Don't know if they still have them- my vote > would be for a brass nut and bolt combination that has been cut to the > right size. > > "We must All hang together, else we most assuradly will Hang separately" > Benjamin Franklin, 1776 > Charles S. Krin, DO FAAFP KC5EVN > >>>> Go down to your local auto parts store and buy a 5/16 stud of a proper length. I think might fit the bill. Good luck....Gary KF9CM From lwbyppp@epix.net Mon Jan 22 19:57:42 1996 Path: news.epix.net!news.sprintlink.net!newsie.dmc.com!news.iii.net!news From: "Thomas C. J. Sefranek" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Help Indentifying Transistor Date: 22 Jan 1996 12:40:56 GMT Organization: SRC Lines: 11 Message-ID: <4e00lb$mv2@news.iii.net> References: <4du6dd$q9j@linet02.li.net> NNTP-Posting-Host: wa1rhp.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: thom@newshost.li.net Hi Thom The lead nearest the tab is the emitter, the lead farthest from the tab is the collector, the lead in between is the base. A 2N2222A is a better device, no one makes 2222's, only the A devices. Any specifications book (Motorola, Harris, National) has a wealth of information on transistors. Also, check the web sites for these guys. Tom WA1RHP From lwbyppp@epix.net Mon Jan 22 19:57:43 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!peer-news.britain.eu.net!psinntp!psinntp!psinntp!pipeline!news From: dsantoro@pipeline.com (Dave Santoro) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Subject: Needed: Eggbeater Plans Date: Tue, 16 Jan 1996 16:33:50 GMT Organization: JRP Securities, Inc. Lines: 12 Message-ID: <4dgk1d$see@news.nyc.pipeline.com> Reply-To: dsantoro@pipeline.com NNTP-Posting-Host: dsantoro.nyc.pipeline.com Xref: news.epix.net rec.radio.amateur.homebrew:12784 rec.radio.amateur.antenna:18522 Am looking to homebrew an Eggbeater Antenna dor Sarex/Mir operation. Can anyone point me to a site or file with plans? Thanks, & 73, _______________________________________________________________________ David H. Santoro | dsantoro@pipeline.com | Amateur Radio Systems Analyst | dsantoro@compuserve.com | Callsign JRP Securities, Inc. | dsantoro@msn.net | N2VYP ----------------------------------------------------------------------- ** From lwbyppp@epix.net Mon Jan 22 19:57:44 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!van-bc!news.cyberstore.ca!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.nd.edu!news.bsu.edu!figmnt.tayloru.edu!jhschutt From: jhschutt@figmnt.tayloru.edu (John Robert Schutt) Newsgroups: rec.radio.amateur.homebrew Subject: Pls Help With Keyer Circuit Question Message-ID: <1996Jan16.174315.2680@figmnt.tayloru.edu> Date: 16 Jan 96 17:43:15 -0500 Organization: Taylor University Lines: 33 Can you help a neophyte in electronics? I built a keyer that I saw described in the article "An Inexpensive Morse Code Keyer" which was published in 73 Amateur Radio Today in June 1995. Here are the questions. 1. Initially, one of the grounds was bad. This could be due to a mistake mad e by a rookie. But, maybe not. Has anyone else built this circuit and had any problems? 2. Now that it works, the volume is barely audible. Any idea what I shoul tr y to correct this? Here are some options: a. Would a bad 2N2222A cause this? That's the amplifier transistor. b. The parts list says to use a Radio Shack 273-091 Piezo Speaker. The author says that this is a 1200 ohm speaker, but the RS 273-091B is a 3500 ohm speaker. WOuld this cause the very low volume? c. Am I correct in mounting the electrolytic cap with the - side towards ground? I thought so, but someone told me that the "curves" side of teh symbol was the positive side. Every reference that I have shows it to be the negative side-- the side closer to the (-) of the battery (ie., ground. I'd really like to hear the keyer. I really appreciate your help. Because ou r News server crashes regularly, e-mail replies are preferred. THANKS. I know that it takes time and effort to reply to a post. John KB9KSM -- ______________________________________________________________________________ _ John Robert Schutt /\ jhschutt@tayloru.edu Taylor University- Fort Wayne //\\ (219) 456-9061 1025 W. Rudisill Blvd. ///\\\ FAX: (219) 456-2119 Fort Wayne, IN 46807 || ------------------------------------------------------------------------------ -  From lwbyppp@epix.net Mon Jan 22 19:57:46 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!nntp1.jpl.nasa.gov!news.alt.net!news1.alt.net!news.aros.net!usenet From: datwyler@aros.net (Douglas L. Datwyler) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Antenna Tuner Kit-First Impressions Date: 22 Jan 1996 13:15:27 GMT Organization: ArosNet Inc. Lines: 53 Message-ID: <4e02li$bov@news.aros.net> References: <1996Jan6.185503.8669@ohstpy> <4csf5c$b0o@newsbf02.news.aol.com> NNTP-Posting-Host: anp17.aros.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 In article <4csf5c$b0o@newsbf02.news.aol.com>, w8jitom@aol.com says... > >In article <1996Jan6.185503.8669@ohstpy>, >garland@ohstpy.mps.ohio-state.edu (JIM GARLAND) writes: > >>My only quibble with the kit is the printed circuit board. The board >itself >>is >>of high quality. It is double-sided, with thru-plated holes, green >>solder-masking, and silk-screened component outlines shown in white. My >>concern >>about the board is that the large majority of the traces seem to be >extremely >>thin. I couldn't measure them, but I'd guess a maximum width of 10 mil, >and >>probably less, perhaps even 6-7 mil. (all the relay control lines are >wired >>this way.) Further, the pad sizes seem too small >>relative to the holes in the pad. I'm not an expert at PCB layout, but >I'd >>think that a pad should have a minimum of 10-15mil of metal around each >hole. >>The majority of holes on the board have significantly less metal than >this. >>In >>fact, a majority of the holes were drilled slightly off-center in the >pads, >>so >>that there is no metal at all on one side of the hole! >> >> > >Hi Jim, This sounds like the boards I get from out of house layout shops >that never work with RF. That's too bad. Maybe you could point that out to >the kit supplier, because your observations illustrate a big problem. >Somewhere I heard the rhyme short and thick does the trick. I assume that >meant RF traces. > >73 Tom I hope I am happy when mine arrives. As for the short and thick, that depends on the signal in RF. Some microwave circuits depend on "controlled" length and thickness, though better called width here, since thick is the depth of the copper clad. In my designs (I design electronics for a few paying customers), width is important in power supply to reduce I-R losses, as well as some key analog traces. I will post as soon as I finish building my tuner to let others know what I think of it. Douglas L. Datwyler WR7O datwyler@aros.net From lwbyppp@epix.net Mon Jan 22 19:57:47 1996 Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!usenet.eel.ufl.edu!gatech!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Automatic Tuner Article Date: 15 Jan 1996 09:11:37 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 26 Sender: root@newsbf02.news.aol.com Message-ID: <4ddnap$q75@newsbf02.news.aol.com> References: <4db7u4$op8@newsbf02.news.aol.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Glen, In article <1f7cc$12f11.27a@NEWS>, ke3mf@atc.ameritel.net (Glenn Thorn) writes: I wrote: >>This is begining to sound like someone danced around the truth a bit in >>the earlier replies. you wrote: >I fail to understand the statement. Let me explain it then. Reading this thread, I first received the impression there was no reason the code was omited other than space and a lack of understanding people would be interested in it. I received the impression QST omitted the flow chart basically on it's own. As I understood your comments, you said the author was concerned about "giving away two years of work to a manufacturer". That leaves me with the impression the author's desire was to have the data left out. If that was even part of the reason for the omission, then everyone should have just said so instead of implying the omission was due to forgetfulness or ignorance. In my opinion, "protecting work" is a very poor reason to omit anything from an friendly helpful educational article. Tom From lwbyppp@epix.net Mon Jan 22 19:57:48 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.dorsai.org!agis!news.tacom.army.mil!news2.acs.oakland.edu!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom13!faunt From: faunt@netcom13.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Subject: Re: QST Automatic Tuner Article In-Reply-To: Jay Craswell's message of 16 Jan 1996 20:02:41 GMT Message-ID: Sender: faunt@netcom13.netcom.com Organization: at home, in Oakland References: <4dh091$pvp$3@mhafc.production.compuserve.com> Date: Tue, 16 Jan 1996 23:29:57 GMT Lines: 16 Given the response to me from LDG, I think they and the QST staff misread the audience. The flow chart and binary is available now, for SASE and formatted PC 3 1/2" floppy, and the source will be available when it's adequately commented. I've got the flow chart already, and suspect I could put the code into an 68HC811E2 (2K vs 512 bytes code space on the A1) with no problem, right now. I can also see why the QST staff didn't publish the flow chart. There are going to be more articles for devices using the MC68HC11 from Dwayne and LDG, with more information available. The article caused me to do some research on the 'HC11, and I think it's a cool IC with lots of potential for amateur radio projects. Check out the HC11 FAQ available at rtfm.mit.edu under sci.electronics, among other places. 73, doug From lwbyppp@epix.net Mon Jan 22 19:57:49 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: smaas@aol.com (SMaas) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Questions on the nature of Hetrodyning/Spectrum Analyser guts Date: 17 Jan 1996 14:19:04 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 20 Sender: root@newsbf02.news.aol.com Message-ID: <4dji38$clf@newsbf02.news.aol.com> References: <4chl02$1te@soap.news.pipex.net> Reply-To: smaas@aol.com (SMaas) NNTP-Posting-Host: newsbf02.mail.aol.com Re: > Why >can't I run the LO at the frequency I'm interested in, >slug the mixer output with some brutal filter that >suffocates anything past a few Hz and accept the result >as reflecting the RF energy at the frequency of >interest? (is it 'cos the output of the mixer is >AC-coupled internal to the mixer? :( ) The problem is noise: you will get downconverted AM noise from the LO, and you will have to deal with 1/f noise in the amplifiers following the mixer. you will also need a mixer that has an IF response to DC. but lots of mixers do this. Finally, there are spurious responses and images that will cause trouble at low IF frequencies. Steve (W5VHJ) From lwbyppp@epix.net Mon Jan 22 19:57:50 1996 From: simcock@adam.com.au (ian simcock) Subject: Radio circuit required Newsgroups: rec.radio.amateur.homebrew Summary: Keywords: Lines: 27 X-Newsreader: TIN [UNIX 1.3 950824BETA PL0] NNTP-Posting-Host: eve.adam.com.au Message-ID: <3102775e.0@eden.adam.com.au> Date: 21 Jan 96 17:26:54 GMT Path: news.epix.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.mel.aone.net.au!eden.adam.com.au!not-for-mail I'm hopeing that someone could point me to either 1) An Internet site with circuit diagrams 2) A book with appropriate circuits 3) A person who could design an appropriate circuit 4) A company that sells what I want. What I need is a small radio that fits the following specs - 1) Any frequency (preferably an unlicenced peice of spectrum) 2) Digital transmition of 500 bytes per second 3) 200 meter range under bad indoor conditions 4) Digital tuning 5) Runs on 4-6 volts 6) Low power consumption 7) Rapid startup/shut down for the transmiter 8) 10 channels If possible I'd like the following improvements 1) 1000+ bytes per second 2) 500+ meter range 3) Run on 3-6 Volts 4) 30+ channels 5) Able to easily transmit analogue (voice) signals Thanks for reading this far. I'll appriciate any help anyone can give me, Ian Simcock. From lwbyppp@epix.net Mon Jan 22 19:57:51 1996 From: simcock@adam.com.au (ian simcock) Subject: Re: Radio circuit required Newsgroups: rec.radio.amateur.homebrew References: <3102775e.0@eden.adam.com.au> Lines: 8 X-Newsreader: TIN [UNIX 1.3 950824BETA PL0] NNTP-Posting-Host: eve.adam.com.au Message-ID: <31027fb2.0@eden.adam.com.au> Date: 21 Jan 96 18:02:26 GMT Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.mel.aone.net.au!eden.adam.com.au!not-for-mail Sorry about this, but as I kind of expected, I forgot something. Under the list of things that would be nice but not essential I'd like to add another item - 6) Separate transmitter/reciever i.e. Able to transmit and recieve at the same time on different frequencies. Thanks again all, Ian Simcock. From lwbyppp@epix.net Mon Jan 22 19:57:52 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!gatech!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Radio REPAIR resource? Date: 17 Jan 1996 16:29:26 GMT Organization: Los Alamos National Laboratory Lines: 11 Message-ID: <4dj857$dbv@newshost.lanl.gov> NNTP-Posting-Host: jdport.lanl.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) Is there such a thing as a radio *repair* newsgroup ? I am particularly interested in a schematic/service info for a Uniden CR-2026 SW receiver at the moment. -- |-------------------------------------------------------| |Jim Devenport WB5AOX | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |-------------------------------------------------------| From lwbyppp@epix.net Mon Jan 22 19:57:52 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!sol.ctr.columbia.edu!news.mindlink.net!agate!cocoa.brown.edu!news From: bsw@cs.brown.edu (Brian R. Swann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Radio REPAIR resource? Date: Fri, 19 Jan 1996 01:13:23 GMT Organization: Brown University Lines: 12 Message-ID: <4dmr7m$iqe@cocoa.brown.edu> References: <4dj857$dbv@newshost.lanl.gov> NNTP-Posting-Host: rnpc1.cs.brown.edu X-Newsreader: Forte Free Agent 1.0.82 Jim Devenport wrote: >Is there such a thing as a radio *repair* newsgroup ? >I am particularly interested in a schematic/service info for >a Uniden CR-2026 SW receiver at the moment. Jim, try sci.electronics.repair 73, Brian WA1VUT From lwbyppp@epix.net Mon Jan 22 19:57:54 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Remote Operating of HF station (VHF or Telephone)? Message-ID: <1996Jan17.184525.27643@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <30FC04FB.E47@soback.kornet.nm.kr> Date: Wed, 17 Jan 1996 18:45:25 GMT Lines: 27 In article <30FC04FB.E47@soback.kornet.nm.kr> Butch Weber writes: >Hello, I am looking for any information on remote operation of my HF rig. >I have a Kenwood TS-440S/AT with a CL-36 with 40 meter attachment at >work and live in an apartment. I know I have seen articles in the past >about remote operations but I am in Korea and don't have access to all >my past magazine articles. I am using a 486 DX2-66 and would like to >interface the computer as well. I haven't seen anything on the Web that >relates to remote operating. If there is and I missed it could someone >please pass the information. Thanks, QST just did a feature on this very subject. I'll just give a quick condensed generic version. You need remote software for your PCs. You can use PCAnywhere or Remote2 or something similar. These programs let one computer control another just as if you were at the keyboard and screen of the controlled computer. Now all you need is rig and antenna control software. There are a number of packages to choose from. You run that on the controlled PC, just as if you were sitting at its console, and control the rig with the package. You'll need a second phone line and a phone patch to get audio in and out of the rig to you at home. That's it. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Mon Jan 22 19:57:55 1996 Path: news.epix.net!uunet!in2.uu.net!news.mindspring.com!usenet From: cwhiffen@atl.mindspring.com (Clay Whiffen) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Toroid permeability ??? Date: Sun, 21 Jan 1996 19:07:39 GMT Organization: MindSpring Enterprises, Inc. Lines: 56 Message-ID: <4du2sc$dle@stealth.mindspring.com> References: <8221045958701@lss.humnet.humberc.on.ca> Reply-To: cwhiffen@atl.mindspring.com NNTP-Posting-Host: user-168-121-82-155.dialup.mindspring.com X-Newsreader: Forte Free Agent 1.0.82 hduff@humnet.humberc.on.ca (Hugh Duff) wrote: >Does anyone know how to measure the permeability/loss of a toroid core >(without too much difficulty !) ? >They are difficult to get locally ( I usually have to order them from >Amidon in Cal.) but some surplus stores in Toronto have a wide >assortment of bins of unmarked toroids. It would be a nice >cost-effective altenative to having to order new ones if we knew what we >had sitting at our doorstep. >A friend on a local BBS originally posed this question to me... >I couldn't really answer him ...I am also curious ! >I thought that winding some wire onto them and taking impedance >measurements at various frequencies may work but how does one accomplish >this ? >Thanks.. >Hugh Duff VA3TO Toronto >--- > þ NFX v1.3 [000] OK, I'll give it a try. Measuring Permeability, Pb, isn't too difficult but it requires measuring inductance. I use a little unit from Jan '81 QST that, in turn, needs a frequency counter. So if you have these then the easy way is probably to measure the dimensions of the core and find it in the Amidon catalog. Then wind enough turns to cover about 3/4 of the core; with ferrites probably about 10 turns but more may be needed to get a good inductance measurement with powered iron cores. Measure inductance L in microhenries. Then calculate the ALratio by: Alratio=L(uH)x10000/N² where N is the number of turns. (If you measure inductance in millihenries use: ALratio=L(mH)x1000000/N²) You can then go back to the Amidon catalog and find the type of core closest to your unknown. . I f in Amidon you can't find a core of the size you are testing you can calculate Pb by: Pb=L(uH)/(.0319xN²xfactor) where: factor=Hx(OD-ID)/(¶x(OD+ID)). H is core height, OD is outside diameter and ID is inside diameter. The numbers you will get will not be exactly the same as the Pb in the catalog but the material types are sufficiently different that you can make a pretty good guess. (at least for the ferrites.) To identify powered cores exactly you need the loss data. Loss data is more difficult to get. You need to be able to measure the Q of the test windings. I won't attempt to get into that here. Good Luck OM, 73 Clay, KF4IX From lwbyppp@epix.net Mon Jan 22 19:57:56 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!spool.mu.edu!howland.reston.ans.net!lamarck.sura.net!fconvx.ncifcrf.gov!mack From: mack@ncifcrf.gov (Joe Mack) Subject: Re: tuning in CW/SSB stations w/ AM only radio? Message-ID: Organization: Frederick Cancer Research and Development Center References: <4d7dvb$m8b@detroit.freenet.org> Date: Mon, 22 Jan 1996 14:58:51 GMT Lines: 37 In article n7ws@azstarnet.com (Wes Stewart) w rites: >In article <4d7dvb$m8b@detroit.freenet.org> am024@detroit.freenet.org (Robert Thomas Jackson) writes: >>From: am024@detroit.freenet.org (Robert Thomas Jackson) >>Subject: tuning in CW/SSB stations w/ AM only radio? >>Date: 13 Jan 1996 04:55:07 GMT > > >>I seem to remeber a few posts a while back about being able to >>tune in SSB stations with an AM radio (SW) by just running a >>477 khz oscillator near it.... Is this true? Do crystals run >>down that low? If so I could just build a VXO in that area and >>be able to adjust it... Has anyone made this work? > >The usual i-f is 455 KHz. Yes crystals can be had for this frequency. A vcxo >would probably have very limited tuning range, however. This scheme will work >after a fashion. The AM detector is used to mix the externally supplied >carrier (BFO) with the SSB signal. The problems include; getting the BFO to >i-f amplitude ratio correct, AGC system overload from the BFO, poor i-f >selectivity, etc. > >Good luck. > >Wes -- N7WS I did this when I was a kid, tuning in hams on a SW receiver before I got my ham license. You don't need a crystal oscillator, any oscillator will do and I just draped a wire from the oscillator into the back of the box of the radio - no solid connection. Joe NA3T mack@ncifcrf.gov From lwbyppp@epix.net Mon Jan 22 19:57:57 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!eng.ufl.edu!usenet.eel.ufl.edu!news-feed-1.peachnet.edu!pirates!cssun.mathcs.emory.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: hts@thor.NET Newsgroups: rec.radio.amateur.homebrew Subject: tunning in CW/SSB W/ AM SW radio. Date: 22 Jan 96 02:01:11 GMT Organization: ucsd usenet gateway Lines: 15 Message-ID: <199601220201.UAA02036@odin.thor.net> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I have invented a kit that allow you to tune in CW/SSB with two SW AM radios. I have enjoyed SSB since a year ago. I have to return my Radio Shack DX-390 to t he store because of its poor quality compare to my receiver. I have bought many A M SW radio from thrift store since than and all of them work great, in fact, I should say excellent. I am willing to share my invention with everyone that does not afford to buy those expensive receiver and have no time to build complicated things. My kit just take you 2 minutes to hook up these two radios and ready to enjoy yea rs of fun in CW/SSB. No modification and no screw driver or soldering required. A ll you need is $5.00 to cover the cost of shipping and cost of the parts for the simple kits and instruction. email me at hts@thor.net for more info. I have 6 CW/SSB receivers now at my station. fun! and cheap but effective. 73 Richard.(hts@thor.net) From lwbyppp@epix.net Mon Jan 22 19:57:59 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!sunrise.gv.ssi1.com!oronet!news From: rst-engr@oro.net (Jim Weir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VCO power supply noise reduction Date: Thu, 18 Jan 1996 06:01:48 GMT Organization: RST Engineering Lines: 27 Message-ID: <4dkno3$i1n@hg.oro.net> References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> NNTP-Posting-Host: rst-engr.oro.net X-Newsreader: Forte Free Agent 1.0.82 >>insert an emitter follower into the >>power line. The base of the emitter follower is biased from a >>resistive voltage divider attached to the collector (which forms >>the "input"), and a fairly large filter capacitor in parallel with >>a smaller one is attached from the base to ground. [snips in consideration of bandwidth] And if the collector has the slightest bit of inductance to an AC short to ground (i.e. like a few inches of wire or board trace) you are gonna have the goldurndest grounded base oscillator you ever HAVE seen. Old trick is to put just a few ohms (like 20-50) of real resistor between the capacitors and the base. Cuts down the chance of oscillation to that of winning an argument with the spouse -- slim and none. Jim Jim Weir VP Engineering | "We seem to be standing on RST Engineering | the foreskin of technology." Grass Valley CA 95945 | (Gen. Chuck Yeager) voice/fax 916/272-1432 | rst-engr@oro.net AR Adv WB6BHI CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ From lwbyppp@epix.net Mon Jan 22 19:58:00 1996 Path: news.epix.net!uunet!in2.uu.net!news.sprintlink.net!news.azstarnet.com!usr10ip38.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VCO power supply noise reduction Date: Sun, 21 Jan 1996 12:02:23 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 38 Message-ID: References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> <1996Jan12.180329.81@ke4zv.atl.ga.us> <4d7ogd$t51@news.azstarnet.com> <30FBE7D3.69B5@arrl.org> NNTP-Posting-Host: usr10ip38.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4dsb1s$t64@globe.indirect.com> randol@indirect.com writes: >From: randol@indirect.com >Subject: Re: VCO power supply noise reduction >Date: 21 Jan 1996 03:14:04 GMT [snip] >So I'd disagree that using commercial parts necessarily means 2nd best. On >the contrary, a designer should be able to optimize a design with a highly >repeatable product. >73, >Mark My fears involve long term effects such as problems with moisture and plastic packaged ICs. This isn't exactly my area of expertise, however, in my department, we have materials people, chemists, and other components engineers that share my concern. I realize that some environments, particularly automotive, have conditions that may be worse than mil spec requirements. However, if you store your car for ten years in a bunker then ship it to Saudi Arabia and store it for a while at 140 degrees F and then ship it to Alaska and store it there for a while then take it out and try to start it with the first turn of the key, what happens? You probably will have six sigma (latest buzz word) repeatability; it fails 999,997 times out of 1,000,000. On a not too related subject, but one brought on by a not to well thought out edict: We have also been forced to eliminate the use of oxygen-depleting-chemicals (ODCs), such as the defluxing agents used to remove rosin flux. So, we use acid fluxes and water-based solvents. Of course, we are using surface mount components too. What are the long tern effects of less than perfect removal of the flux trapped under the components in moist environments. Your guess is as good as mine. But this is progress :-) >Airbag. n. 1) An automotive accessory designed to explode on impact. ALL of our products are designed to explode on impact. From lwbyppp@epix.net Mon Jan 22 19:58:03 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!gatech!newsfeed.internetmci.com!info.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: guenter.koellner@oen.siemens.DE (Koellner, Guenter) Newsgroups: rec.radio.amateur.homebrew Subject: RE: Want simple 0.5-1W amp design for 6m Date: 17 Jan 96 15:40:00 GMT Organization: ucsd usenet gateway Lines: 27 Message-ID: <30FD1C03@SmtpGate.Oen1.Oen.Siemens.De> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu hello, regarding to the message below: why don't you use the suiting mitsubishi module M57735, it is 0.2W in and 22W out. And you never saw a simpler design like this. The only thing you have to add is a TX/RX switch... If you really need a transistor design i can supply you one on request. vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU (AX.25) DL4MEA@AMSAT.ORG (Internet) HTTP://WWW.SCN.DE/~KOELLNER (WWW) | Date: Tue, 16 Jan 1996 10:58:48 +0000 (GMT) | From: CBS5LD@leeds.ac.uk (L. DE BRUIJN) | Subject: Want simple 0.5-1W amp design for 6m | | Hello, I would like a simple RF amp schmatics 0.5-1W for the 6m band. Any | designs? | | | Laurens | | P.S. I'm a beginner From lwbyppp@epix.net Mon Jan 22 19:58:04 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!gatech!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!Austria.EU.net!siemens.at!rdserv.sie.siemens.co.at!news From: josef.gergetz@siemens.at (Josef Gergetz) Newsgroups: rec.radio.amateur.homebrew Subject: Wanted: UHF-cavity TH327/TH347 Date: Wed, 17 Jan 1996 13:14:23 GMT Organization: Siemens AG Austria Lines: 14 Message-ID: <4disgr$p2i@rdserv.sie.siemens.co.at> NNTP-Posting-Host: pc6797.pseg.siemens.co.at X-Newsreader: Forte Free Agent 1.0.82 Hi there, for our moonbounce-work at OE6XHF we are looking for a UHF-cavity for the Thomson TH327 / TH347 power tubes. If you have any information please write to josef.gergetz@siemens.at oe6jgd @ oe6xhg.aut.eu Many thanks Josef, OE6JGD - op at OE6XHF From lwbyppp@epix.net Mon Jan 22 19:58:04 1996 Path: news.epix.net!news.sprintlink.net!jupiter.planet.net!news.ia.net!zeus.ia.net!kovar From: kovar@zeus.ia.net (Jack Kovar KE0AX) Newsgroups: rec.radio.amateur.homebrew Subject: WTB:Brown Bros Paddles for parts. Date: 18 Jan 1996 16:09:44 GMT Organization: InterAccess Networking Lines: 17 Message-ID: <4dlrc8$hb8@hera.ia.net> NNTP-Posting-Host: zeus.ia.net X-Newsreader: TIN [version 1.2 PL2] Hi there! My BROWN BRO BTL-A paddle got dropped and broke some parts on it. Need one paddle adjustment screw, 2 red paddles and red plastic paddle pivot block in rear. Please help me if you have parts so I can get DITTY BOPPING AGAIN! Jack Kovar Ke0AX 319-378-9852 Toddville,Ia From lwbyppp@epix.net Mon Jan 22 19:58:06 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!crl.dec.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!lfheller.demon.co.uk From: Leon Heller Newsgroups: rec.radio.amateur.homebrew Subject: Re: X-tal 1.36MHz - looking for Date: Wed, 17 Jan 96 09:25:41 GMT Organization: Home Lines: 17 Message-ID: <821870741snz@lfheller.demon.co.uk> References: Reply-To: Leon@lfheller.demon.co.uk X-NNTP-Posting-Host: lfheller.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 X-Mail2News-Path: lfheller.demon.co.uk In article fbures@alchemy.chem.utoronto.ca "Frank Bures" writes: > Desperately looking for 1.36MHz Crystal I need to repair a > mass spectrometer. If someone has one at home, please help. > Will pay. Close enough frequency acceptable. > I could also do with a 21.76MHz one. Getting crystals made isn't at all expensive. I can get custom crystals in about a week here in the UK for less than #10. Leon -- Leon Heller, G1HSM | "Do not adjust your mind, there is E-mail leon@lfheller.demon.co.uk | a fault in reality": on a wall Phone: +44 (0)1734 266679 | many years ago in Oxford. From lwbyppp@epix.net Mon Jan 22 19:58:07 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!hookup!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!sgiblab!news.spies.com!genmagic!bug.rahul.net!a2i!rahul.net!a2i!news.clark.net!starport!brian.carling Distribution: world Newsgroups: rec.radio.amateur.homebrew From: brian.carling@acenet.com (Brian Carling) References: <4dbk6s$h0q@oracle.damerica.net> Date: Wed, 17 Jan 1996 07:00:00 -0500 Organization: =ACE= ONLINE (301)942-2218 Subject: XLR balanced to non ckt. Message-ID: <2a6.7673.546@acenet.com> Lines: 19 Newsgroups: rec.radio.amateur.homebrew From: brian.carling@acenet.com "mail sometimes bounces here, please resend if needed!" Dave you really probably need the adapter that has a transformer built in to it... DA>Need to convert XLR (cannon) balanced inputs to standard line input. Do I DA>just put DA>one end to ground and use the other? XLR is a balanced audio input (for DA>lower noise) DA>Not sure of Z in ckt. DA>Thanks DA>Dave --- þ SLMR 2.1a þ From lwbyppp@epix.net Mon Jan 22 19:58:08 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.dorsai.org!news.ilx.com!psinntp!psinntp!psinntp!howland.reston.ans.net!ix.netcom.com!netcom.com!rohrwerk From: rohrwerk@netcom.com (John Seboldt) Subject: Re: XLR balanced to non ckt. is it easy ?? Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: <4dbk6s$h0q@oracle.damerica.net> Date: Sun, 14 Jan 1996 23:04:48 GMT Lines: 26 Sender: rohrwerk@netcom4.netcom.com daustin@community.net (Dave Austin) writes: >Need to convert XLR (cannon) balanced inputs to standard line input. Do >I just put one end to ground and use the other? XLR is a balanced audio >input (for lower noise) Not sure of Z in ckt. With any transformer-input circuit (many pro balanced ins still use transformers), you should indeed ground one side of the balanced line, and feed your unbalanced hot side to the other balanced pin. Usually for microphones, the phasing standard is "pin 2 high, pin 3 low". Surprisingly, you may not actually have a balanced input even with XLR connectors -- I have a Yamaha board at work like this where the balanced transformers are an *option*, and not installed. If it's NOT a transformer input, you should do what gives you best results: just feed from ground to one of the balanced legs. In this case, there's an active differential input, and grounding one side will do you no good in some cases. : John Seboldt rohrwerk@netcom.com / CW: It don't mean a thing : K0JD... Minneapolis, MN / if it ain't got that swing! : My R2/T2 station described in / Di dah, di dah, di dah, di dah... > http://www.lehigh.edu/lists/qrp-l/k0jd/index.html < From lwbyppp@epix.net Mon Jan 22 19:58:09 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: pfzouave@aol.com (PFZouave) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have? Date: 16 Jan 1996 17:26:07 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 22 Sender: root@newsbf02.news.aol.com Message-ID: <4dh8lv$cdo@newsbf02.news.aol.com> References: <4demi7$f0q@hpcvsnz.cv.hp.com> Reply-To: pfzouave@aol.com (PFZouave) NNTP-Posting-Host: newsbf02.mail.aol.com I was the original poster who created this "Xpert Needed: Zener Diodes" thread. I figured I'd take a moment to thank the dozens of individuals who took the trouble to respond. The composite answer appears to be this: Yes, the forward biased diodes can be used as a reverse biased zener might, and several individuals have done so in their designs, though there can be troubles related to temperature effects, and the fact that the forward "breakdown" does not exhibit the sharp "knee" that the zener would. For my particular application (as outlined in the original message), it seems the best route may be to forgo the zener/transistor discrete circuit in lieu of one of the many available 3-terminal supervisor IC's by maxim, panasonic, dallas, and even sony. Again, thanks to all for their help!! /=====================================================/ / PFZouave@aol.com / / The absurdity of a claim is not a valid measure of its probability / /=====================================================/ From lwbyppp@epix.net Mon Jan 22 19:58:10 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.netnet.net!news.inc.net!news.sol.net!uniserve!van-bc!news.mindlink.net!agate!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier From: mzenier@netcom.com (Mark Zenier) Subject: Re: Xpert Needed:Zener Diodes --- Can you make what you dont have? Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: <4d4ik0$po5@newsbf02.news.aol.com> Date: Mon, 15 Jan 1996 04:03:46 GMT Lines: 13 Sender: mzenier@netcom13.netcom.com in <4d4ik0$po5@newsbf02.news.aol.com>, PFZouave wrote: : My problem is this: The processor is spec'd to work down to 2.5 volts. If : I add a safety margin and say the minimum before reset should be 3.o : volts, 3 - 0.7 leaves me with a required zener voltage of 2.3 volts. I : have several catalogs laying around here, and can't find any zeners less : than 3 volts. The TL431 shunt regulator IC (also called a programmable zener) is good down to 2.5 volts. It doesn't like much parallel capacitance, but otherwise looks like a zener. Mark Zenier mzenier@eskimo.com mzenier@netcom.com From lwbyppp@epix.net Mon Jan 22 19:58:11 1996 Path: news.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!chi-news.cic.net!mr.net!news.mr.net!msc.edu!apctrc!paperboy.amoco.com!cronkite!usenet From: Chester Mccarter Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: Yaesu FIF-232c information and/or help Date: Mon, 22 Jan 1996 02:54:34 -0800 Organization: Amoco Corp Lines: 9 Message-ID: <31036CEA.5D9B@amoco.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (Win16; I) Xref: news.epix.net rec.radio.amateur.misc:97089 rec.radio.amateur.homebrew:12824 rec.radio.amateur.equipment:23916 I have a Yeasu FT747GX and am trying to find a diagram of the FIF-232c CAT cable. I'm sure that there is someone out there that has built a similiar type cable. Please reply via e-mail also. -- Chester Mccarter, CNE [Team OS/2] jcmccarter@amoco.com From lwbyppp@epix.net Mon Jan 22 19:58:12 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in1.uu.net!brighton.openmarket.com!decwrl!purdue!yuma!holly.ACNS.ColoState.EDU!drranu From: drranu@holly.ACNS.ColoState.EDU (Emarit Ranu) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: Re: Yaesu FIF-232c information and/or help Followup-To: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment Date: 22 Jan 1996 18:00:48 GMT Organization: Colorado State University, Fort Collins, CO 80523 Lines: 20 Message-ID: <4e0jcg$22kk@yuma.ACNS.ColoState.EDU> References: <31036CEA.5D9B@amoco.com> NNTP-Posting-Host: holly.acns.colostate.edu X-Newsreader: TIN [version 1.2 PL2] Xref: news.epix.net rec.radio.amateur.misc:97094 rec.radio.amateur.homebrew:12826 rec.radio.amateur.equipment:23919 Chester Mccarter (jcmccarter@amoco.com) wrote: : I have a Yeasu FT747GX and am trying to find a diagram of the FIF-232c : CAT cable. I'm sure that there is someone out there that has built a : similiar type cable. Please reply via e-mail also. Try February QST, 1993 page 37. Less than $10 to make and works damn well. : -- : Chester Mccarter, CNE : [Team OS/2] : jcmccarter@amoco.com -- -Emarit 73's drranu@holly.ColoState.EDU Electrical Engineering, Colorado State Univeristy KG0CQ _._ __. _____ _._. __._ Packet: KG0CQ@KF0UW.#NECO.USA.NOAM All generalizations are bad. Censorship: ###### From lwbyppp@epix.net Fri Jan 26 13:47:56 1996 Path: news.epix.net!uunet!in1.uu.net!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: MUENZLERK@uthscsa.EDU (Muenzler, Kevin) Newsgroups: rec.radio.amateur.homebrew Subject: @test Gateway 4l900 - 14:34Z Date: 24 Jan 96 13:37:00 GMT Organization: ucsd usenet gateway Lines: 2 Message-ID: <01I0DS14N8YA000SYX@uthscsa.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu test 01/24/96 14:34Z From lwbyppp@epix.net Fri Jan 26 13:47:57 1996 Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.fibr.net!news1.crl.com!nntp.crl.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom2!faunt From: faunt@netcom2.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Subject: Re: Adding lighting to Red Lion Controls counter modules In-Reply-To: faunt@netcom11.netcom.com's message of Tue, 23 Jan 1996 06:40:39 GMT Message-ID: Sender: faunt@netcom2.netcom.com Organization: at home, in Oakland References: Date: Wed, 24 Jan 1996 22:49:17 GMT Lines: 14 Xref: news.epix.net sci.electronics.components:1514 rec.radio.amateur.homebrew:12906 No response so far, but an alternative question. Does anyone have an address or other contact information for Red Lion Controls? 73, doug Newsgroups: sci.electronics.components From: faunt@netcom11.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Date: Tue, 23 Jan 1996 06:40:39 GMT Has anyone added lighting to Red Lion Controls counter modules, as sold by DigiKey? I want to use one in the car, but I want to be able to see it, night and day, easily. Are any of them easier to illuminate than others? 73, doug From lwbyppp@epix.net Fri Jan 26 13:47:58 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.kei.com!ub!csn!mesa5.mesa.colorado.edu!mesa5.mesa.colorado.edu!not-for-mail From: jrybak@mesa5.Mesa.Colorado.EDU (James P. Rybak) Newsgroups: rec.radio.amateur.homebrew Subject: Alpha-Delta Antennas Date: 21 Jan 1996 17:24:04 -0700 Organization: Mesa State College Lines: 5 Message-ID: <4dulf4$ftm@mesa5.mesa.colorado.edu> NNTP-Posting-Host: 198.233.35.99 X-Newsreader: TIN [version 1.2 PL2] Has anyone had any experiences (good or bad) with Alpha-Delta antennas? Jim Rybak W0KSD From lwbyppp@epix.net Fri Jan 26 13:47:59 1996 Path: news.epix.net!news.sprintlink.net!cc.iu.net!bb.iu.net!blombard From: blombard@bb.iu.net (Bob Lombardi) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Announcing FilDes 2.0 Date: 25 Jan 1996 13:03:10 GMT Organization: InternetU, Inc., Palm Bay, FL Lines: 26 Message-ID: <4e7v2e$ngb@cc.iu.net> References: <4e6pmh$f96@cc.iu.net> NNTP-Posting-Host: bb.iu.net X-Newsreader: TIN [version 1.2 PL2] Bob Lombardi (blombard@iu.net) wrote: deleting much of my post. : The program comes with a companion utility called Airwndl (Air Wound L) : which calculates the number of turns for an air-wound single-layer : solenoid coil. A complete description of Fildes2 is included in the : file FilDes2.doc, and also as a Windows 3.1 Write (r) file, FilDes2.wri. : Everything is in a zipped archive called FDS200.ZIP. It is available note this: ^^^^^^^^^^^ : at ftp.lehigh.edu where it is currently found in /pub/listserv/qrp-l/tools. : I have also uploaded it to ftp.ee.ualberta.ca in the directory : /pub/cookbook/softw/ibm. It should be available there shortly. I goofed. The name of the archive is fds200a.zip. You wouldn't find the other one anyway, but just in case you're using some sort of program to get it for you, you should have the exact name. -- Bob Lombardi WB4EHS in Melbourne, FL o \---\---\ blombard@iu.net or blombard@freenet.fsu.edu /\ | Telescope making, optics, astronomy, piano, bicycling -\ 7 & radio | I've run out of things I can say in 4 lines. (*)/(*) | From lwbyppp@epix.net Fri Jan 26 13:48:00 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!cs.umd.edu!coopnews.coop.net!news.den.mmc.com!news.vf.mmc.com!ew0203!hbrown From: hbrown@ew0203.resd (Harry H. Brown) Newsgroups: rec.radio.amateur.homebrew Subject: Re: ANY INFO ON AM912A/TRC? Date: 23 Jan 1996 16:26:48 GMT Organization: Sun Microsystems Lines: 11 Distribution: world Message-ID: <4e3288$p3h@morgan.vf.mmc.com> References: <4dplgm$k9h@miwok.nbn.com> Reply-To: hbrown@ew0203.resd NNTP-Posting-Host: ew0203.resd.vf.ge.com Gary, I would guess that the efficiency will be as good or better than a strip line or tuned line design. With the silver plating it will be a little better but n ot a whole lot. I would suggest using the 250. Use one of the 250 amp designs from an older ARRL handbook to determine the bias voltages required and how to key it on during transmit. I would expect somewhere around 55 to 60 % effeciency. I have an AM-6154 amp t hat uses an 8930 which is essentially a 250 but with a larger plate diameter a nd around 350 watts dissapation. It works very well and I have gotten 350 or s o watts out. I never bothered to calculate the efficiency. There is no reason why you shouldn't get 250 or so watts out. 73, Harry, W3IIT From lwbyppp@epix.net Fri Jan 26 13:48:01 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!agate!holonet!colossus.holonet.net!woodybbs!1-275-17-0!bill.ward From: Bill.Ward@f17.n275.z1.fidonet.org (Bill Ward) Date: 23 Jan 96 09:18:38 Newsgroups: rec.radio.amateur.homebrew Subject: ANY INFO ON AM912A/TRC? Message-ID: X-FTN-To: Gary Davidson Organization: WoodyWare Software, Inc. Lines: 18 The device that you're describing is presently being sold by a mil. surplus co. named Fair Radio, which is located in Lima Ohio. They may be able to supply you with some if not all of the schmatics of that unit. You can probably use a 4cx250 in it with no problems. One thing that you will to do is build a power supply for it,but if you look in any A.A.R.L. manuals, you be able to find a supply for vhf use using that tube. How you plan to use the amp also should be considered. Different modes require different voltages especially for ssb and fm. I hope this helps. --- WILDMAIL!/WC v4.10 # Origin: AR-NET: Excalibur BBS, 404-608-1907, (73:1501/2) (73:1501/2.0) -- |Fidonet: Bill Ward 1:275/17 |Internet: Bill.Ward@f17.n275.z1.fidonet.org | | Standard disclaimer: The views of this user are strictly his own. From lwbyppp@epix.net Fri Jan 26 13:48:02 1996 Path: news.epix.net!news.sprintlink.net!maggie.ionsys.com!news.corpcomm.net!news.gate.net!news-adm From: lslewis@gate.net (Larry Lewis) Newsgroups: rec.radio.amateur.homebrew Subject: Balum Loss Question Date: Fri, 26 Jan 1996 00:53:22 GMT Organization: CyberGate, Inc. Lines: 15 Message-ID: <4e98au$1dv6@news.gate.net> NNTP-Posting-Host: ftmfl2-13.gate.net X-Newsreader: Forte Free Agent 1.0.82 What is the loss (in db) of a 4:1 coax (assume 9913) balum at 144 mhz? or Where can I find the data (didn't see it in 1993 ARRL Handbook nor the RSGB VHF/UHF handbook)? or How to calculate the loss. or What is your guess? My guess is 0.2db??? Any guidance would be appreciated, your educated guess will also be appreciated. Thanks - Larry KN6WC Please reply via e-mail From lwbyppp@epix.net Fri Jan 26 13:48:03 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!agate!holonet!colossus.holonet.net!woodybbs!1-275-17-0!bill.ward From: Bill.Ward@f17.n275.z1.fidonet.org (Bill Ward) Date: 23 Jan 96 09:07:49 Newsgroups: rec.radio.amateur.homebrew Subject: Balun Help Message-ID: X-FTN-To: Lawrence Stoskopf Organization: WoodyWare Software, Inc. Lines: 13 I think what you're looking for can be found under the company named the"Wireman". He sella a unum 50 to 50 ohmns that is based on teflon coax with ferrite beads. His adress can be found in most ham radio mag. under that name. Gud luck. N4BLR --- WILDMAIL!/WC v4.10 # Origin: AR-NET: Excalibur BBS, 404-608-1907, (73:1501/2) (73:1501/2.0) -- |Fidonet: Bill Ward 1:275/17 |Internet: Bill.Ward@f17.n275.z1.fidonet.org | | Standard disclaimer: The views of this user are strictly his own. From lwbyppp@epix.net Fri Jan 26 13:48:06 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.sprintlink.net!eskimo!bgudgel From: bgudgel@eskimo.com (Bob Gudgel) Subject: Re: Circut req'd - telephone line in use indicator. X-Nntp-Posting-Host: eskimo.com Message-ID: Sender: news@eskimo.com (News User Id) Organization: Eskimo North (206) For-Ever X-Newsreader: TIN [version 1.2 PL2] References: Date: Sun, 21 Jan 1996 18:54:18 GMT Lines: 15 I understand that there is a device that can be connected in series with your modem or phone that inhibits off hook when another extension is in use. Here in Seattle it is supposedly available at Home Depot (a home hardware store). I think it is a thyristor type device that turns on when the voltage across it is larger than some preset value (20 volts maybe). Of course, if the voltage is somewhat low, then the line is already in use and it won't trigger. This is only a guess as to how it works, but hearing that it was a two terminal "diode looking" device, that's probably correct. Also, supposedly one of these things had an LED in series also. I would think though that you'd want to put a capacitor in parallel with that for less attenuated audio. Bob KI7IQ http://www.eskimo.com/~bgudgel From lwbyppp@epix.net Fri Jan 26 13:48:07 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet From: richard@andes.sps.mot.com (Richard Christensen) Newsgroups: rec.radio.amateur.homebrew Subject: coax and connectors Date: 23 Jan 1996 10:49:02 -0600 Organization: AutoSoft Corp., Bountiful, UT Lines: 15 Sender: richard@andes.sps.mot.com Message-ID: <4e33hv$mgt@newsgate.sps.mot.com> NNTP-Posting-Host: andes.sps.mot.com Where is a good place to get coax and connectors? I don't want to be more specific than this since I am interested in projects from HF to microwave. -- /\ /\ . /\____ _-_ / \ _/\ / \ /\ / \ /\ / \ / \ / \ /\/ \ / \_/\_/ Y \ /\/\/ \ u \/ \___/ \/ \ / \/ \ ----------------------------------v-------------------------------- Richard Christensen KC7JPQ richard@andes.sps.mot.com Go Cougars!! Beat Utah!!! richard@dolphin.autosoft.com Wk Ph. # (512) 891-6686 From lwbyppp@epix.net Fri Jan 26 13:48:08 1996 Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!rpi!gatech!newsfeed.pitt.edu!news From: Sandy Knepper Newsgroups: rec.radio.amateur.homebrew Subject: Collins KWM-380 Date: 23 Jan 1996 22:55:29 GMT Organization: University of Pittsburgh Lines: 10 Message-ID: <4e3p11$hb5@usenet.srv.cis.pitt.edu> NNTP-Posting-Host: jbddup-a-12.rmt.net.pitt.edu Does anyone know of someone who would repair my KWM-380. I have two circuit boards (control and synthesizer) that must have a bad chip. Are there any boards available or nonworking KWM-380s. Thanks, Dave, W3BJZ Publisher of the monthly Collins Journal (814) 487-7468 (eve.) From lwbyppp@epix.net Fri Jan 26 13:48:09 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Re: Collins KWM-380 Date: 24 Jan 1996 01:40:50 GMT Organization: Los Alamos National Laboratory Lines: 16 Message-ID: <4e42n2$7vl@newshost.lanl.gov> References: <4e3p11$hb5@usenet.srv.cis.pitt.edu> NNTP-Posting-Host: jdport.lanl.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) To: slkst29.@vms.cis.pitt.edu (This is a second try since your listed email address refused to respond) I maintain several KWM-380's and HF-380's and have a priceless service manual for them. I even have a junker or 2 but they are not for sale. How about some symptoms? Maybe we could narrow down which board it may likely be... and go from there. -- |-------------------------------------------------------| |Jim Devenport | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |-------------------------------------------------------| From lwbyppp@epix.net Fri Jan 26 13:48:10 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!news.supernet.net!nntp.cntfl.com!news.fsu.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!news.dfn.de!news.kfa-juelich.de!djukfa11!iff161 Organization: Forschungszentrum Juelich Date: Tue, 23 Jan 1996 21:11:55 +01 From: Bob Mueller Message-ID: <96023.211155IFF161@DJUKFA11.BITNET> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Custom meter scales! Lines: 21 Just a word of warning! You can just divide up an arc into equal segments and get a nice looking scale but it is likely to be inaccurate. To do a good job you should measure a bunch of angles versus current and construct a smooth scale by interpolation on the measured points (or measure ALL the places where there are to be scale divisions!). I would suggest 10 or so measured points. The problem is that the magnetic fild is not strictly uniform over the region used by the meter coil. There are various reasons for the nonuniform field but the end effect is a nonlinear scale which is dealt with in different ways by different commercial makers. One technique is to have several scales with different sorts of common nonlinearities built in. Then pick the one most nearly matching the movement. Hewlett Packard had a machine which could follow the needle as different currents were applied to the movement and construct a very nice scale from the measurements. (I suspect writing the scale onto a film.) This scale then belonged only to the tested meter. For one time only users, doing it by hand is not a bad job. I recently made a scale and the result was good (without any computer but working on an enlarged master followed by photcopy size reduction.) Bob From lwbyppp@epix.net Fri Jan 26 13:48:11 1996 Path: news.epix.net!uunet!in1.uu.net!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Custom meter scales! Date: 24 Jan 1996 08:38:41 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 36 Sender: root@newsbf02.news.aol.com Message-ID: <4e5cp1$r3v@newsbf02.news.aol.com> References: <96023.211155IFF161@DJUKFA11.BITNET> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <96023.211155IFF161@DJUKFA11.BITNET>, Bob Mueller writes: > >Just a word of warning! You can just divide up an arc into equal segments >and >get a nice looking scale but it is likely to be inaccurate. To do a good job >you should measure a bunch of angles versus current and construct a smooth >scale by interpolation on the measured points (or measure ALL the places >where >there are to be scale divisions!). I would suggest 10 or so measured points. I used to manage the D'Arsonval meter area of Prime Instruments. Our low quality "wigglers" had gross non-linearity over their measurement ranges, but the 90 degree deflection high quality movements were *very* linear. As an interesting note, some customers specified their meters caliberated up to 100% high, but 0% low. That way the charging equipment they sold never "looked bad". That tolerance was necessary on 39 cent wholesale price meters! Gross non-linearity was usually caused by non-linear spring pressure (the cheap meters either used magnetic zero return or a simple single turn spring), and the pole pieces being poorly constructed. The permanent magnet's poles did not surround the movable coil with a uniform air gap in the cheap meters, so flux density changed as the coil moved through it's arc. Check the scale linearity when working with unknown meters, especially if the movements are cheaply made! 73 Tom From lwbyppp@epix.net Fri Jan 26 13:48:12 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!agate!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!kerry.w..miller From: Kerry.W..Miller%1:2619/211.9 (Kerry W. Miller%1:2619/211.9) Date: 21 Jan 96 10:11:50 Newsgroups: rec.radio.amateur.homebrew Subject: Re: Does anyone have a design for a simple-ish radio transmitter/tra Message-ID: Organization: WoodyWare Software, Inc. Lines: 39 To: Kerry W. Miller%1:2619/211.9%12:320/100.666 From: kmiller@airmail.net (Kerry W. Miller) Subject: Re: Does anyone have a design for a simple-ish radio transmitter/transciever Organization: customer of Internet America mahon.murphy_dtti.team400.ie@internet-eireann.ie (Cian Murphy) wrote: >I have been surfing around for a while on the Net looking for a design >for a radio transmitter Range Does Not Matter. I'm just looking for a >starting point to radio - cheaply. I would be very grateful to anyone >who could mail one in ascii/ attached bitmap or otherwise directly to >the above address, using my name Cian Murphy, as the Subject. > Thanks Cian, As soon as I can get together with a friend who has a scanner, I'll scan in a few schematics and post them or e-mail them. We've been having problems getting our free times at the same times! I have a couple of qrp transmitters, a rx or two, and I think even a simple transceiver. I'll post something here when I get the scans done. There were several others who asked about them, so I'll drop a note here when I get them scanned. 73, Kerry kmiller@airmail.net # Origin: Usenet:customer of Internet America (1:2619/211.9) # Origin: Gateway ARNet <-> HamNet by HB9EBW (12:320/100.666) -- |Fidonet: Kerry W. Miller%1:2619/211.9 2:301/249.666 |Internet: Kerry.W..Miller%1:2619/211.9 | | Standard disclaimer: The views of this user are strictly his own. From lwbyppp@epix.net Fri Jan 26 13:48:13 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!sparky.wrlc.org!netnews.com!uhog.mit.edu!news.kei.com!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: Dry Cell sizes Date: 23 Jan 96 22:32:31 GMT Organization: ucsd usenet gateway Lines: 17 Message-ID: <9600238224.AA822443981@mails.imed.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu There has been a thread on Ham-Homebrew about how to put a "blank" AA dry cell in a pack when going from Nicad to Alkaline. This reminded me of something I saw when putting the kids' toys together at Christmas. Many of the toys use a reducer and a AA cell where there is intended to be a C cell during normal use! These are found primarily on the toys that scream "TRY ME" to the kids. (I'm a big kid at heart and it drives my wife nuts. "How can I teach the kids not to touch when you do?"). So the moral is: if you have something that uses C cells and you need an emergency supply, you can wrap something around a AA and get a C cell. Ray Mack WD5IFS mack@mails.imed.com From lwbyppp@epix.net Fri Jan 26 13:48:14 1996 Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!dns.crocker.com!calweb!usenet From: billj@calweb.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: dummy load? Date: 25 Jan 1996 16:09:52 GMT Organization: CalWeb Internet Services, Inc. Lines: 5 Message-ID: <4e8a0g$er6@news.calweb.com> References: <4dja6q$h4s@bashful.einsteininfo.com> <30FDF472.663D@jpaw.com> NNTP-Posting-Host: sac1-2.calweb.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) If ypu need to go to higher frequencies than 50 MHz then get as much RG58 as you can (50 to 100 feet) and use it as an attenuator with the dummy load as described by Jim W9GXC. Bill K7NOM From lwbyppp@epix.net Fri Jan 26 13:48:15 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!news.ntnet.nt.ca!gov.nt.ca!ve8ev From: ve8ev@gov.nt.ca (John Boudreau) Subject: Duplexer to Bandpass Filter Message-ID: <1996Jan24.235015.28694@gov.nt.ca> Organization: Government of the NWT, Canada Date: Wed, 24 Jan 1996 23:50:15 GMT Lines: 14 I have a 3 cavity mobile VHF duplexer that I would like to re-configure as a 2m bandpass filter. Is this possible? How would I go about it? Thanks for any info, please reply direct... 73 John VE8EV ================================================================ John Boudreau - VE8EV E-mail: ve8ev@amsat.org Inuvik, NWT Packet: VE8EV@VE8EV.#INU.NT.CAN.NOAM CANADA VE8EV@KO-23/KO-25 ================================================================ From lwbyppp@epix.net Fri Jan 26 13:48:15 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!blackbush.xlink.net!news.uni-mainz.de!news.th-darmstadt.de!uni-erlangen.de!rznews.rrze.uni-erlangen.de!news From: Richard Hieber Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew Subject: European archive site? Date: 25 Jan 1996 16:00:42 GMT Organization: RRZE Lines: 21 Message-ID: <4e89fa$41o@rznews.rrze.uni-erlangen.de> NNTP-Posting-Host: miraculix.rrze.uni-erlangen.de Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Xref: news.epix.net rec.radio.amateur.antenna:18654 rec.radio.amateur.homebrew:12921 Hi all, as I tend to use my Usenet browser quite unregulary, I'd prefer to retrieve the traffic of the last few months or so at an archive site. I know the official archive site of r.r.a.antenna and of r.r.a.homebrew somewhere at a stateside location, but the slowness of my access takes the fun out of it. I'd like to know an archive site for the rec.radio.amateur.* newsgroups somewhere in Europe. I don't need an FTP site for programms or stuff, just archived Usenet traffic. Do you know any, over here in the Old World? Vy 73, Richard -- Richard Hieber, DL8MFQ/AA8CP EMAIL: Richard.Hieber@rrze.uni-erlangen.de From lwbyppp@epix.net Fri Jan 26 13:48:17 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!ablecom!ns2.mainstreet.net!sloth.swcp.com!news.dgsys.com!usenet From: wcovexip@moose.ptialaska.net (Bruce & Debora Gordon) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Follow up vehicle battery question... Date: 22 Jan 1996 00:38:07 GMT Organization: wcovexip@ptialaska.net Lines: 15 Message-ID: <4dum9f$jt7@news.dgsys.com> NNTP-Posting-Host: juneau_15.dialups.ptialaska.net X-Posted-From: InterNews 1.0.6@juneau_15.dialups.ptialaska.net X-Authenticated: wcovexip on POP host moose.ptialaska.net Get ride of the gell cells if you leave your car out in freezing weather. They are very seceptable to freezing and will be distroyed if they do. Deep cycle marine batteries are a much better solution. I had real problems with gell cells in cold weather here, so I speak with realtime experience. Bruce Gordon * Debora Gordon R.N. Bruce's Trading Post P.O. Box EXI Excursion Inlet South Juneau, Alaska 99850 Excursion Inlet, Alaska 99850 University of Alaska Remote Weather Data Collection Site fnbeg@aurora.alaska.edu AL7AQ@KL7HFI * KL7WJ@KL7HFI wcovexip@ptialaska.net Wards Cove Packing Co. **** Have bandwidth and connection Will communicate **** From lwbyppp@epix.net Fri Jan 26 13:48:17 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!usc!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: wa8ulx@aol.com (WA8ULX) Newsgroups: rec.radio.amateur.homebrew Subject: FS 486 & 386 Processor Date: 23 Jan 1996 11:12:41 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 2 Sender: root@newsbf02.news.aol.com Message-ID: <4e31dp$id7@newsbf02.news.aol.com> NNTP-Posting-Host: newsbf02.mail.aol.com I have an Intel 486DX-25 processor and 386DX-25 processor for sale if interested I can be reached at WA8ULX@AOL.COM 73 bRUCE From lwbyppp@epix.net Fri Jan 26 13:48:18 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!plug.news.pipex.net!pipex!weld.news.pipex.net!pipex!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!news.sesqui.net!compassnet.com!usenet From: Spencer Petri Newsgroups: rec.radio.amateur.homebrew Subject: FS: HV supply diodes! Date: 25 Jan 1996 01:56:00 GMT Organization: Compass Net, Inc. Lines: 6 Message-ID: <4e6nvg$4b4@saratoga.compassnet.com> NNTP-Posting-Host: dial49.e-tex.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Great diodes for your big amp supply. These are 20,000 V and I ran a check at 1.2A for 6 hours, these babies can take it. $10 each or build a bridge at 4 for $35. $3 for priority mail. 73 de Pete WA5JCI EM-21 From lwbyppp@epix.net Fri Jan 26 13:48:19 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!uwm.edu!cs.utexas.edu!howland.reston.ans.net!usc!news.cerf.net!newsserver.sdsc.edu!acsc.com!news.trw.com!batman!out Newsgroups: rec.radio.amateur.homebrew Subject: FS:WCC100 Soldering Iron tips Message-ID: <1996Jan24.130405.1455@batman> From: byron_hellewell@out.trw.com (Byron) Date: Wed, 24 Jan 1996 20:01:17 GMT Reply-To: byron_hellewell@out.trw.com (Byron) Nntp-Posting-Host: 129.193.101.235 Lines: 6 For Sale 25 ETO long conical soldering tips. New and unused. For the Weller WCC100 temp controlled Iron. Sell all 25 for $25 Retail about $5 each. e-mail byron_hellewell@out.trw.com From lwbyppp@epix.net Fri Jan 26 13:48:20 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!mr.net!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!newsjunkie.ans.net!Rezonet.net!mixnews2!qbc-clic!com18!daniel.lacasse Newsgroups: rec.radio.amateur.homebrew In-Reply-To: all@com18.com Subject: Games or features on TM-742A? From: daniel.lacasse@com18.com Message-ID: Date: Mon, 22 Jan 96 11:53:00 EST Organization: Babillard COM18 BBS Lines: 11 Hi all, PLEASE, if you know any hidden features or have heard about it, please let me know! TM-741A has 3, does the TM-742A has at least one??? 73's de | Fido: 1:240/118 | Internet: Daniel.Lacasse@com18.com I)aniel | Franco: 101:155/118 | Packet: VE2DLX@VE2SJC.#QBC.PQ.CAN.NA From lwbyppp@epix.net Fri Jan 26 13:48:21 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!chi-news.cic.net!nntp.coast.net!news.dacom.co.kr!news.uoregon.edu!news.islandnet.com!salmon!clinton.peebles From: clinton.peebles@saloon.bcbbs.net (Clinton Peebles) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Grapefruit powered XMTR? Date: Sun, 21 Jan 1996 14:06:00 GMT Message-ID: <9601211428464864@saloon.bcbbs.net> Organization: Salmon Siding Saloon BBS 604-357-9942 Distribution: world References: <1996Jan16.194742.28225@llyene.jpl.nasa.gov> <4di8v6$ Lines: 7 B>re: grapefruit powered Transmitter, Did Gilligans Island know about it? Didn't the professor make a battery charger out of coconuts on one episode? They had to stir their coconuts. --- þ QMPro 1.53 þ Salmon Siding Saloon - Salmo B.C. (604) 357-9942 From lwbyppp@epix.net Fri Jan 26 13:48:21 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.minn.net!skypoint.com!news.cyberstore.ca!van-bc!news.rmii.com!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: pfzouave@aol.com (PFZouave) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Grapefruit powered XMTR? Date: 22 Jan 1996 13:02:38 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 12 Sender: root@newsbf02.news.aol.com Message-ID: <4e0jfu$cur@newsbf02.news.aol.com> References: <9601211428464864@saloon.bcbbs.net> Reply-To: pfzouave@aol.com (PFZouave) NNTP-Posting-Host: newsbf02.mail.aol.com The discussion of grapefruit powered whatever reminded me of an ad I saw in a trade rag five, maybe six years ago for a company making single board microcontrollers. The add was full color, back back spread featuring their board connected to an exercise wheel with a gerbil running in it. It looked like the had replaced one of the exercise wheel's bearings will a little dc motor (generator). /=====================================================/ / PFZouave@aol.com / / The absurdity of a claim is not a valid measure of its probability / /=====================================================/ From lwbyppp@epix.net Fri Jan 26 13:48:23 1996 Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!braintree!news.av.qnet.com!news.qnet.com!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!magnus.acs.ohio-state.edu!cgreenha From: cgreenha@magnus.acs.ohio-state.edu (Christopher K Greenhalgh) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Grapefruit powered XMTR? Date: 19 Jan 1996 19:27:13 GMT Organization: The Ohio State University Lines: 29 Message-ID: <4dorah$5aa@charm.magnus.acs.ohio-state.edu> References: <1996Jan16.194742.28225@llyene.jpl.nasa.gov> <4dj0qa$78a@ixnews5.ix.netcom.com> NNTP-Posting-Host: beauty.magnus.acs.ohio-state.edu In article , Don Bayomi wrote: >re: grapefruit powered Transmitter, Did Gilligans Island know about it? > >I will have to try that experiment with the grapefruit. Perhaps I missed the first part of this thread, but when I was in grade school, one of our science projects was making a battery out of an orange. We took pennys (copper) and nickles (zinc I think) and pushed them into the orange 3/4s the way down, alternating between them (penny, nickle, penny, nickle, penny, ect.), being very carfull not to let them touch...but getting them as close as you can. After going half way around (dont go any farther...it will slowly decrease the voltage), we were able to light a small lamp. I cant remember what voltage we got...but it did work...a basic 'acid' battery. Remember to end one side with a penny, and the other with a nickle (polarity). I also remember seeing a potatoe powered clock somewhere in a catalog...but cant remember where, but do remember it worked on the same principal. Take care all, & 73. -- Christopher K. Greenhalgh, N8WCT Computer/Electronic Tech. II at The Ohio State University E-Mail: ckg+@osu.edu (cgreenha@magnus.acs.ohio-state.edu) Radio : n8wct@w8cqk.#cmh.oh.usa.noam From lwbyppp@epix.net Fri Jan 26 13:48:24 1996 Path: news.epix.net!uunet!in1.uu.net!daver!news.cerf.net!qualcomm.com!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: wlfuqu00@service1.UKy.EDU (William L. Fuqua III) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ham-Homebrew Digest V96 #23 Date: 21 Jan 96 21:30:25 GMT Organization: ucsd usenet gateway Lines: 28 Message-ID: <199601212130.QAA23596@service1.cc.uky.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu At 08:22 PM 1/20/96 PST, you wrote: ---------------------------------------------------------------------- > >Date: Fri, 19 Jan 1996 17:39:11 GMT >From: bwhittem@mailgw.sanders.lockheed.com >Subject: 814 vacume tube > >does anyone know the use and value of these tubes? >a friend ahs a few that appear unused. >73 >barry >wb1edi > >------------------------------ It is about 1/2 the size of an 813. 73 Bill ko4ww William L. Fuqua III P.E. Department of Physics and Astronomy CP-177 Chem. Phys. Bldg. University of Kentucky Lexington, Ky 40506-0055 E-mail WLFUQU00@POP.UKY.EDU Phone (606) 257-4155 From lwbyppp@epix.net Fri Jan 26 13:48:25 1996 Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!huey.cadvision.com!uunet!in2.uu.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!news2.acs.oakland.edu!news1.cris.com!news From: wmkresl@townsquare.net (William Kresl) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help needed repairing eddystone SW rig. Date: Sat, 20 Jan 1996 23:39:28 GMT Organization: Concentric Internet Services Lines: 40 Message-ID: <4dru7g$9en@spectator.cris.com> References: NNTP-Posting-Host: crc3.cris.com X-Newsreader: Forte Free Agent 1.0.82 ai657@freenet.toronto.on.ca (Paul Egan) wrote: >I need some help repairing an Eddystone EC-10 SW rig. >I have the manual and have tested the transistors using the >figures in the "Voltage Analysis" section. >All seemed close to the values quoted except TR4 & TR5 (IF Amp). >TR4 should be 0.87v (E) 1.15(B) 5.6(C) but is 0.36(E) .64(B) 1.71(C) >TR5 should be 0.40v (E) 0.70(B) 7.5(C) but is 0.05(E) .28(B) 0.28(C) >I am not well versed in electronics repair and am hoping that someone can >put in the right direction. Should these transistors be replaced? If so, >would they be commonly available here in Canada. (OC171) If not, then >what would be a suitable substitution? I've noticed that these >transistors have 4 leads. The fourth is labeled "S" and always goes to >ground. Is this akin to grounding the case of the transistor? >Looking forward to hearing from anyone who may be able to help. >Please email. Thanks in advance. >Paul. The 'S" is for SHIELD, normally tied to ground. Based on the voltages you described between the BASE and EMITTER I would conclude these are old GERMANIUM type transistors...hard to come by. Also, based on your measured values, your collector values are quite low from what they shoould be.. I doubt the transistors are the cause but another stage (like AF AMPLIFIER transistor) shorting out that bogs everything else down...or a resistor or RF CHOKE that feeds your IF AMP. Very rarely do CLASS A amplifier stages operating at low DC levels just die, I would look at the HI-POWER stages...AF AMP, POWER SUPPLY and REGULATOR first...... -- Wm Kresl WB9BBC @KD9JK.WI.USA.NOAM -- Wm Kresl GE Medical Systems Milwaukee, WI From lwbyppp@epix.net Fri Jan 26 13:48:26 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!sdd.hp.com!hplabs!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock From: dstock@hpqmdla.sqf.hp.com (David Stockton) Subject: Re: Help needed repairing eddystone SW rig. Sender: news@hpqmoea.sqf.hp.com (SQF News Admin) Message-ID: Date: Thu, 25 Jan 1996 17:01:51 GMT References: Nntp-Posting-Host: hpqmocc.sqf.hp.com Organization: Hewlett-Packard LTD, South Queensferry, Scotland Lines: 29 Paul Egan (ai657@freenet.toronto.on.ca) wrote: : I need some help repairing an Eddystone EC-10 SW rig. : I have the manual and have tested the transistors using the : figures in the "Voltage Analysis" section. : All seemed close to the values quoted except TR4 & TR5 (IF Amp). : TR4 should be 0.87v (E) 1.15(B) 5.6(C) but is 0.36(E) .64(B) 1.71(C) : TR5 should be 0.40v (E) 0.70(B) 7.5(C) but is 0.05(E) .28(B) 0.28(C) Without a manual in front of a reader, this won't help much. I've fixed several EC10's though the last was some years ago. They're twee enough to want to fix, but not particularly good performers, though. What I found were loads of dead transistors. I suspect most of the OC170 OC171 devices have an age related silent failure mechanism. The AF115 or was it AF117 was notorious. A bit of artful recalculation of bias resistors and fitment of some fairly docile modern silicon devices ought to be possible. Reliability of resistors and larger values of capacitors of that period was a bit poor, too. A rebuild may make more sense than a repair. Cheers David From lwbyppp@epix.net Fri Jan 26 13:48:27 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!guardian.up.edu!gateway.sequent.com!news.orst.edu!news.uoregon.edu!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: 19 Jan 1996 10:47:56 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 19 Sender: root@newsbf02.news.aol.com Message-ID: <4doefc$jfu@newsbf02.news.aol.com> References: <4djhh1$c9u@newsbf02.news.aol.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <1996Jan19.142956.5916@ke4zv.atl.ga.us>, gary@ke4zv.atl.ga.us (Gary Coffman) writes: >It doesn't take much of an impedance for that >pulse to translate to a very high voltage (a megavolt is not uncommon), >which can then flash across ordinary insulation or air gaps. The purpose >of transient suppressors is to give the pulse a defined and controlled >place to discharge rather than depending on chance to allow it to flash >somewhere unpredicted. That's a lot of current, it almost sounds like a direct hit on the outlet! Are you saying the MOV you were describing would protect equipment from damage with that type of hit? Perhaps they are worthwhile! Can you run a model of the MOV you described in a typical line input circuit to see what happens? 73 Tom From lwbyppp@epix.net Fri Jan 26 13:48:28 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!arther.castle.net!news.netrail.net!imci2!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Help With MOV's Message-ID: <1996Jan19.142956.5916@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4dgqha$g86@maureen.teleport.com> <4djhh1$c9u@newsbf02.news.aol.com> Date: Fri, 19 Jan 1996 14:29:56 GMT Lines: 26 In article <4djhh1$c9u@newsbf02.news.aol.com> w8jitom@aol.com (W8JI Tom) writ es: >In article <1996Jan17.031054.24105@ke4zv.atl.ga.us>, gary@ke4zv.atl.ga.us >(Gary Coffman) writes: > >>It doesn't, nor does it need to, a megavolt transient is quite sufficient >>in itself. > >How does a megavolt ultra short rise time transient make it past the line >bypass caps, terminal blocks outlet, fuse box and so on? It often doesn't. The impedances across which it is expressed will determine whether it will flash over there or not. The transient, for the case of lightning, is a current pulse of up to 18,000 amperes, but of very short duration (so energy is low). It doesn't take much of an impedance for that pulse to translate to a very high voltage (a megavolt is not uncommon), which can then flash across ordinary insulation or air gaps. The purpose of transient suppressors is to give the pulse a defined and controlled place to discharge rather than depending on chance to allow it to flash somewhere unpredicted. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Jan 26 13:48:29 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!usc!newshub.cts.com!newshub.nosc.mil!news!horowitz From: horowitz@nosc.mil (Alan M. Horowitz) Subject: Re: How to add battery capacity to a vehicle? Message-ID: <1996Jan17.204946.3170@nosc.mil> Sender: news@nosc.mil Organization: NCCOSC RDT&E Division, San Diego, CA References: Date: Wed, 17 Jan 1996 20:49:46 GMT Lines: 4 The camper modules are a high-current diode, meant to ensure that the car's oem battery doesn't see the (separately wired) "camper" load. The purpose is to ensure that the battery which motivates the starter, doesn't get drained too low by camper use. From lwbyppp@epix.net Fri Jan 26 13:48:30 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: s3_0114@EFP.Poznan.PL (Tomek Burdziak) Newsgroups: rec.radio.amateur.homebrew Subject: How to expand the TX range of the Icom IC-T22 Date: 26 Jan 96 13:17:52 GMT Organization: ucsd usenet gateway Lines: 14 Message-ID: NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Hello everybody. I need my IC-T22 to transmit on 160MHz where paraglider pilots used to chat. If you know how to make my Icom do it, please, write to me. Maybe you know somebody who knows? You could make me happy giving me his address. Thank you in advance, Tomek From lwbyppp@epix.net Fri Jan 26 13:48:31 1996 Newsgroups: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!picker!central.picker.com!sam From: sam@stdavids.picker.com (Sam Goldwasser) Subject: Re: I found some old vacuum tubes ... In-Reply-To: solasaar@cc.Helsinki.FI's message of 25 Jan 1996 15:09:55 GMT Message-ID: Followup-To: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave Sender: news@picker.com Nntp-Posting-Host: 144.54.160.15 Organization: Picker International, Inc. References: <4e723n$8i2@nntp.Stanford.EDU> <4e86g3$86s@oravannahka.Helsinki.FI> Distribution: inet Date: Thu, 25 Jan 1996 23:22:37 GMT Lines: 39 Xref: news.epix.net sci.electronics.equipment:854 sci.electronics.components:1526 rec.radio.amateur.homebrew:12917 rec.radio.shortwave:69233 In article <4e86g3$86s@oravannahka.Helsinki.FI> solasaar@cc.Helsinki.FI (Juha Solasaari) writes: > Magnavox 12BA6 pentode (rf/if amplifier), 12 V filament > Magnavox 12BE6 heptode (frequency changer) > Magnavox 12AV6 double diode, triode (detector, first > af stage) > RCA Electron Tube 35C5 output pentode, 35 V filament (approx.) > Sentinel 12BE6 > TEN 12BE6 > General Electric MA? ? > ?? 12BA6 > ?? 12AV6 > ?? 35 W4 (2) ? Just now I can't find this type. > The nominal heater voltage for 12xxx types is 12.6 volts. > > Is there a simple way to tell if the tubes are good ? Not really but the two tests below will find most bad tubes. It will not pick up weak tubes but even then a repair shop replaced tubes, perhaps 20 % of the tubes they replaced were actually bad (I know because the local TV repair shop's trash can was a favorite hangout on trash day and nearly all the tubes I scrounged tested good on a real tube tester!) 1. Use an ohmmeter to test for filament continuity. The nice thing about tubes (aside from their cheery glow) is that you can see inside - you can locate the filametn by tracing from the pins - it will be the whitish fine wire in the center of each of the sections. Or, it is almost always pins 3,4 on a 7 pin tube and 4,5 on a 9 pin tube. 2. Look for a silvery metal spot inside the tube. If you see this, the vacuum is intact. If it is milky white or red, the tube has lost its vacuum. These are all very common tube types. Even today, they sell for less than $10 new. Years ago they were around $1-2. --- sam From lwbyppp@epix.net Fri Jan 26 13:48:33 1996 Path: news.epix.net!news.sprintlink.net!news.comm.net!imci3!imci4!imci5!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: smaas@aol.com (SMaas) Newsgroups: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave Subject: Re: I found some old vacuum tubes ... Date: 25 Jan 1996 20:16:21 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 23 Sender: root@newsbf02.news.aol.com Message-ID: <4e9a15$pcs@newsbf02.news.aol.com> References: <4e86g3$86s@oravannahka.Helsinki.FI> Reply-To: smaas@aol.com (SMaas) NNTP-Posting-Host: newsbf02.mail.aol.com Xref: news.epix.net sci.electronics.equipment:856 sci.electronics.components:1529 rec.radio.amateur.homebrew:12919 rec.radio.shortwave:69234 Mike Mackaplow (mike@chemeng.Stanford.EDU) wrote: > While helping clear my mom's garage, I found some > vacuum tubes: Magnavox 12BA6 pentode (rf/if amplifier), 12 V filament Magnavox 12BE6 heptode (frequency changer) Magnavox 12AV6 double diode, triode (detector, first af stage) RCA Electron Tube 35C5 output pentode, 35 V filament (approx.) Sentinel 12BE6 TEN 12BE6 General Electric MA? ? ?? 12BA6 ?? 12AV6 ?? 35 W4 (2) These are pretty common old tubes. Many are used in the classical "All American five" five-tube radio chassis. They're available from a few sources these days, mostly made in Easter Europe. Not worth squat. Sorry. Steve From lwbyppp@epix.net Fri Jan 26 13:48:34 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!news1.digital.com!pa.dec.com!decuac.dec.com!haven.umd.edu!news.umbc.edu!hookup!news.mathworks.com!news.kei.com!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!news.funet.fi!news.helsinki.fi!karhu.Helsinki.FI!solasaar From: solasaar@cc.Helsinki.FI (Juha Solasaari) Newsgroups: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave Subject: Re: I found some old vacuum tubes ... Followup-To: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave Date: 25 Jan 1996 15:09:55 GMT Organization: University of Helsinki Lines: 41 Distribution: inet Message-ID: <4e86g3$86s@oravannahka.Helsinki.FI> References: <4e723n$8i2@nntp.Stanford.EDU> NNTP-Posting-Host: karhu.helsinki.fi Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: TIN [version 1.2 PL0] Xref: news.epix.net sci.electronics.equipment:874 sci.electronics.components:1561 rec.radio.amateur.homebrew:12935 rec.radio.shortwave:69269 Mike Mackaplow (mike@chemeng.Stanford.EDU) wrote: > While helping clear my mom's garage, I found some > vacuum tubes: Magnavox 12BA6 pentode (rf/if amplifier), 12 V filament Magnavox 12BE6 heptode (frequency changer) Magnavox 12AV6 double diode, triode (detector, first af stage) RCA Electron Tube 35C5 output pentode, 35 V filament (approx.) Sentinel 12BE6 TEN 12BE6 General Electric MA? ? ?? 12BA6 ?? 12AV6 ?? 35 W4 (2) ? Just now I can't find this type. The nominal heater voltage for 12xxx types is 12.6 volts. > Is there a simple way to tell if the tubes are good ? How I think there is not. Filaments (heaters) can be checked with an ohm- meter (and possible shorts between electrodes). Were the tubes in their carton boxes or loose? Tubes without boxes are probably used - some of them can be good still. A tube tester would tell something, but it is hard to find one nowadays. (And even harder to find a person who knows how to use it.) > would I find out if they have any value ? How would one go about > or, more likely, donating them ? > Thanks, > Mike Mackaplow > mike@chemeng.stanford.edu > P.S. - I am in the southern San Francisco Bay area I am in southern Finland. Regards, Juha Solasaari From lwbyppp@epix.net Fri Jan 26 13:48:35 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!news.supernet.net!nntp.cntfl.com!news.internetMCI.com!newsfeed.internetmci.com!EU.net!sun4nl!geertj From: geertj@ripe.net (Geert Jan de Groot) Subject: Impedance of RG316 tefloncoax? X-Nntp-Posting-Host: belegen.ripe.net Message-ID: Sender: news@inter.NL.net (News at news) Organization: RIPE Network Coordination Centre Date: Tue, 23 Jan 1996 19:08:10 GMT Lines: 5 Does anyone know the impedance of RG316 tefloncoax? Thanks, Geert Jan From lwbyppp@epix.net Fri Jan 26 13:48:35 1996 Path: news.epix.net!news.sprintlink.net!cc.iu.net!news From: wnewkirk@iu.net (Bill Newkirk) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Impedance of RG316 tefloncoax? Date: 25 Jan 1996 02:33:35 GMT Organization: Space Coast Amateur Technical Group Lines: 15 Message-ID: <4e6q5v$f97@cc.iu.net> References: Reply-To: wnewkirk@iu.net (Bill Newkirk) NNTP-Posting-Host: netport-23.iu.net X-Newsreader: IBM NewsReader/2 v1.2 In , geertj@ripe.net (Geert Jan de Groot) writes: >Does anyone know the impedance of RG316 tefloncoax? > >Thanks, > >Geert Jan i believe it's 50 ohms (don't have my coax reference here tho...i could be mixing it up with RG-400..) Bill Newkirk WB9IVR The Space Coast Amateur Technical Group Melbourne, FL duty now for the future of amateur radio Lombardi's 1st Law of Business: Companies succeed in spite of their best effort. If they succeed at all. From lwbyppp@epix.net Fri Jan 26 13:48:36 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!sierra.net!squaw-d115.sierra.net!user From: rst@tetrault.com (Bob T.) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Impedance of RG316 tefloncoax? Date: Wed, 24 Jan 1996 07:37:49 -0800 Organization: Engineered Solutions Lines: 2 Message-ID: References: NNTP-Posting-Host: squaw-d115.sierra.net It is 50 Ohms. The main difference is that it is designed for 200C temperature applications. Heavy Duty stuff... From lwbyppp@epix.net Fri Jan 26 13:48:37 1996 Path: news.epix.net!news.sprintlink.net!ionews.ionet.net!usenet From: jforest@ionet.net (jim forest) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Impedance of RG316 tefloncoax? Date: 26 Jan 1996 14:55:57 GMT Organization: IONet Lines: 11 Message-ID: <4eaq1t$7f4@ionews.ionet.net> References: <4e6q5v$f97@cc.iu.net> NNTP-Posting-Host: tsip52.ionet.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 In article <4e6q5v$f97@cc.iu.net>, wnewkirk@iu.net says... > >In , geertj@ripe.net (Geert Jan de Groot) writes: >>Does anyone know the impedance of RG316 tefloncoax? >> >>Thanks, >> Its 50 ohms, I used tons of in the military. jim From lwbyppp@epix.net Fri Jan 26 13:48:38 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!news.bc.net!news.uoregon.edu!hpg30a.csc.cuhk.hk!news.cuhk.edu.hk!agate!howland.reston.ans.net!gatech!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!unixg.ubc.ca!van-bc!uniserve!news1.ottawa.istar.net!fonorola!news.ottawa.istar.net!news.cyberplus.ca!sp16 From: mgallego@br.homeshopping.com.br (Marcos Antonio Gallego) Subject: Information about building QRP tx/rx's... Message-ID: <1157cc$103b38.121@news.cyberplus.ca> Date: Sun, 21 Jan 1996 21:59:56 GMT X-Newsreader: News Xpress Version 1.0 Beta #4 Lines: 6 Hi all, I'm looking for an article that has some QRP circuits for SSB. I don't know if QST had published one. If anybody knows what issues, please let me know. Thanks to you all. 73's. Marcos (please, answer by email if possible) From lwbyppp@epix.net Fri Jan 26 13:48:40 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!sun!oucsboss!gw2.att.com!gw1.att.com!csn!ub!news.kei.com!newsfeed.internetmci.com!news.msfc.nasa.gov!cs.utk.edu!gaia.ns.utk.edu!usenet From: Mark Mansfield Newsgroups: rec.radio.amateur.homebrew Subject: Lowfer help. Date: Sun, 21 Jan 1996 21:03:18 -0600 Organization: Univ. of Tenn at Martin Lines: 6 Message-ID: <3102FE76.94B@UTM.Edu> NNTP-Posting-Host: dialup02.utm.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win95; I) CC: markman@utm.edu Does anyone know if there is a listserver for Lowfer stuff? I'm interested in any info and pointers to ftp sites that contain Lowfer related files. Thanks, Mark From lwbyppp@epix.net Fri Jan 26 13:48:41 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: Lowfer help. Date: Wed, 24 Jan 1996 16:53:36 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 14 Message-ID: References: <3102FE76.94B@UTM.Edu> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <3102FE76.94B@UTM.Edu> Mark, I do not know of any FTP servers but there is a LOWFER BBS run by John H. Davis who edits "The Notebook" column in the LOWDOWN. His BBS is: 706 672-0360. That is a good place to start. Cliff Buttschardt W6HDO On Sun, 21 Jan 1996, Mark Mansfield wrote: > Does anyone know if there is a listserver for Lowfer stuff? > I'm interested in any info and pointers to ftp sites that contain Lowfer > related files. > > Thanks, > Mark > > From lwbyppp@epix.net Fri Jan 26 13:48:42 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.cyberramp.net!uunet!in2.uu.net!istar.net!news1.vancouver.istar.net!news.vancouver.istar.net!van-bc!unixg.ubc.ca!news.bc.net!news.bcit.bc.ca!news From: Colin Schmutter Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MC1496/1596 obsolete ? Date: 19 Jan 1996 02:05:45 GMT Organization: BCIT Lines: 25 Message-ID: <4dmu9p$6vp@chopin.bcit.bc.ca> NNTP-Posting-Host: usr042.bcit.bc.ca X-Newsreader: Xref: news.epix.net sci.electronics.components:1416 rec.radio.amateur.homebrew:12827 In article <821626298snz@lfheller.demon.co.uk> Leon@lfheller.demon.co.uk write s: >Elantec are advertising the EL4083C current-mode 4-quadrant multiplier >which goes up to 200 MHz. It's in an 8-pin DIL package and looks quite >easy to use. It should nake a good substitute for the Motorola devices. >Samples are available from Elantec on (800) 333-6314 ext 311. > >I think that the NE602 has been replaced by the NE612. > >Leon >-- >Leon Heller, G1HSM | "Do not adjust your mind, there is >E-mail leon@lfheller.demon.co.uk | a fault in reality": on a wall >Phone: +44 (0)1734 266679 | many years ago in Oxford. The TL 442 would make a good alternative to the MC1496. Made by Texas Instruments, this chip requires a much lower component count. It has balanced 50 ohm and 600 ohm inputs and is ideal for product detector circuits. Colin cschmutter@bcit.bc.ca From lwbyppp@epix.net Fri Jan 26 13:48:43 1996 Path: news.epix.net!uunet!in2.uu.net!news.eng.convex.com!newsrelay.netins.net!news.netins.net!usenet From: MKubovic@trgnet.com (Mark Kubovich) Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MC1496/1596 obsolete ? Date: 21 Jan 1996 20:59:12 GMT Organization: Technology Resource Group Lines: 18 Message-ID: <4du9f0$6c5@insosf1.netins.net> References: <137cc$16c20.255@news.ak.net> <30FF1A2B.2F85@aps.anl.gov> NNTP-Posting-Host: s137.netins.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Xref: news.epix.net sci.electronics.components:1430 rec.radio.amateur.homebrew:12834 In article <30FF1A2B.2F85@aps.anl.gov>, wammack@aps.anl.gov says... > >ECG has a ECG973 or ECG973D for the MC1496, NTE has NTE973. For the >MC1596,I've found nothing. >Hello wrote: >> >> Hello, >> >> Is there a remplacement for this chips ? >> >> Happy New Year. >> opworld@worldnet.fr >> Happy >> New opworld@worldnet.fr >> Year Check National Semiconductor. Digi-Key (800)-344-4539 has the LM1496 listed i n various packages for sale. From lwbyppp@epix.net Fri Jan 26 13:48:44 1996 Path: news.epix.net!news.sprintlink.net!lori.albany.net!news1.cris.com!news2.acs.oakland.edu!newsxfer.itd.umich.edu!news.mathworks.com!news.kei.com!ub!csn!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!milo.mcs.anl.gov!usenet From: John Wammack Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MC1496/1596 obsolete ? Date: Thu, 18 Jan 1996 22:12:27 -0600 Organization: Argonne National Laboratory Lines: 13 Message-ID: <30FF1A2B.2F85@aps.anl.gov> References: <137cc$16c20.255@news.ak.net> NNTP-Posting-Host: ecp40.aps1.anl.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (Win95; I) Xref: news.epix.net sci.electronics.components:1449 rec.radio.amateur.homebrew:12850 ECG has a ECG973 or ECG973D for the MC1496, NTE has NTE973. For the MC1596,I've found nothing. Hello wrote: > > Hello, > > Is there a remplacement for this chips ? > > Happy New Year. > opworld@worldnet.fr > Happy > New opworld@worldnet.fr > Year From lwbyppp@epix.net Fri Jan 26 13:48:45 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!jussieu.fr!rain.fr!world-net!usenet From: opworld@worlnet.fr Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MC1496/1596 obsolete ? Date: Fri, 26 Jan 1996 11:03:55 GMT Organization: World-Net information exchange, Internet provider. Lines: 12 Message-ID: <4eacmg$2n8@aldebaran.sct.fr> References: <137cc$16c20.255@news.ak.net> <4ch84d$5ie@abyss.West.Sun.COM> NNTP-Posting-Host: client118.sct.fr X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net sci.electronics.components:1551 rec.radio.amateur.homebrew:12932 In article <137cc$16c20.255@news.ak.net>, Hello wrote: > >Is there a remplacement for this chips ?... Hello, Thanks for your answers. Have a nice opworld@worldnet.fr Day From lwbyppp@epix.net Fri Jan 26 13:48:46 1996 Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!rpi!gatech!newsfeed.internetmci.com!server2.ols.net!usenet From: Andy Brinkley Newsgroups: rec.radio.amateur.homebrew Subject: Re: MCX100 PROM programming ? Date: 25 Jan 1996 03:28:17 GMT Organization: Online South Incorporated Lines: 15 Message-ID: <4e6tch$83h@server2.ols.net> References: <8224331276601@lss.humnet.humberc.on.ca> NNTP-Posting-Host: brinkley.ols.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) To: hduff@humnet.humberc.on.ca hduff@humnet.humberc.on.ca (Hugh Duff) wrote: > > >I recently aquired a 16 channel Motorola MCX100 commercial VHF radio. >Wondering if anyone has any info on programming a PROM for it ? Hugh - I can't help much with the addressing of the PROM etc, but if you need a PROM burned I have the equipment to burn one for the MCX-100 Andy (N4ROX) "brinkley@ols.net" From lwbyppp@epix.net Fri Jan 26 13:48:47 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!unixg.ubc.ca!rover.ucs.ualberta.ca!tribune.usask.ca!news.uregina.ca!MERCURY.CS.UREGINA.CA!john From: john@MERCURY.CS.UREGINA.CA (John Rosloot) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc Subject: Morse code to text display wanted Date: 21 Jan 1996 19:45:49 GMT Organization: University of Regina Lines: 15 Message-ID: <4du55d$irl@sue.cc.uregina.ca> NNTP-Posting-Host: mercury.cs.uregina.ca Xref: news.epix.net rec.radio.amateur.homebrew:12829 rec.radio.amateur.equipment:23924 rec.radio.amateur.digital.misc:13688 Hi. My dad is a Ham operator, and asked me if there were some inexpensive way to have incoming Morse code automatically translated and displayed on a CRT. Since I know nothing about Ham radio, I thought I'd post here. I'm sure what he wants to do must be possible; don't know about the inexpensive part though. If anyone can help us out I'd appreciate it. I'd prefer that responses be sent in private email, as I usually don't read these groups. Thanks in advance. -- John Rosloot, technical analyst Dept. of Computer Science, University of Regina Regina, Saskatchewan, Canada http://www.cs.uregina.ca/~john/ john@cs.uregina.ca From lwbyppp@epix.net Fri Jan 26 13:48:48 1996 Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!paperboy.ids.net!chowda!bob.berlyn From: bob.berlyn@chowda.com (Bob Berlyn) Newsgroups: rec.radio.amateur.homebrew Subject: Motorola Conversion Help Date: Sat, 20 Jan 1996 04:55:35 GMT Message-ID: <9601201000172314@chowda.com> Organization: Chowdanet BBS - 401-331-2604 Distribution: world Lines: 14 Hello All, I am looking for information on converting Motorola Syntor business band radios to 2 meters. I thought I saw something about it some where but can't remember just where or when. If any of you have this info or know where I can find it please E-Mail me. Thanks Bob.Berlyn@Chowda.com From lwbyppp@epix.net Fri Jan 26 13:48:48 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!pacifier!rainrgnews0!news.proaxis.com!news From: boonek@proaxis.com (Kim Boone) Newsgroups: rec.radio.amateur.homebrew Subject: Motorola Micor Date: 23 Jan 1996 02:22:57 GMT Organization: ProAxis Communications, Inc. Lines: 6 Message-ID: <4e1gq1$qiq@news.proaxis.com> NNTP-Posting-Host: ppp66.proaxis.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Looking for info/parts for Motorola Micor radios. Please contact me by e-mail . Thanks, Kim, N0ZSF boonek@proaxis.com From lwbyppp@epix.net Fri Jan 26 13:48:49 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!EU.net!sun4nl!xs4all!usenet From: maxie@xs4all.nl (Max Baars) Newsgroups: rec.radio.amateur.homebrew Subject: Nature radio Date: Tue, 23 Jan 1996 02:13:37 GMT Organization: At home Lines: 17 Message-ID: <4e1g5d$bth@news.xs4all.nl> Reply-To: maxie@xs4all.nl NNTP-Posting-Host: asd05-06.dial.xs4all.nl X-Newsreader: Forte Agent .99b.112 Hello, I would like to read more about nature-radio. Can someone point me to information on the net of to recent magazine articles? Thank you, and 73.. --------------------------------------------------------- M. H. A. Baars = Max PA3GEC = e-mail maxie@xs4all.nl Interested in: = packet bbs pa3gec@pi8zaa Homebrew T&M and radio equipment, live music, girls, beer To invent, you need a good imagination and a pile of junk -- Thomas Edison --------------------------------------------------------- From lwbyppp@epix.net Fri Jan 26 13:48:50 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: ne 602/612 Date: Mon, 22 Jan 1996 17:45:30 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 27 Message-ID: References: <3lau5n7$2i8_001@pcm.co.za> <4dpeg0$b75@ixnews8.ix.netcom.com> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4dpeg0$b75@ixnews8.ix.netcom.com> If you have trouble with the http address and need to use the fax, try: 1-800-282-2000. There is a listing for the 602, but I have yet to find a listing for the 612. Like it does not exist! Cliff Buttschardt W6HDO On 20 Jan 1996, Wanda M Desmond wrote: > In <3lau5n7$2i8_001@pcm.co.za> workshop@pcm.co.za (Workshop) writes: > > > >Can anyone tell me if there is a site on the net where I can > >get application notes on the ne 602 or 612 chips.They are not in any > of > >the data books that I have got. > > > >You can e-mail me at workshop@pcm.co.za , or post to this group. > > > >thanks > > > >Robin > > The URL for Philips is Http://www.semiconductors.philips.com/ps/ > > You can download .pdf (Adobe Acrobat Reader) files of datasheets, > application notes and etc. > > John B. Lawrence > > From lwbyppp@epix.net Fri Jan 26 13:48:51 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: bigjon1@ix.netcom.com(Jon Shay ) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need 10 meter conversion info for Cobra 148gtl Date: 22 Jan 1996 18:16:03 GMT Organization: Netcom Lines: 16 Message-ID: <4e0k93$a9b@ixnews8.ix.netcom.com> References: <4djt6j$32v$3@mhafn.production.compuserve.com> <4dkf20$dju@cloner3.netcom.com> NNTP-Posting-Host: tuc-az1-22.ix.netcom.com X-NETCOM-Date: Mon Jan 22 10:16:03 AM PST 1996 In <4dkf20$dju@cloner3.netcom.com> timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI ) writes: > > >There is a guy in AZ somewhere that advertises a book called CB to 10 >mtrs, I see the ad alot. I wrote for a catalog of his offerings about a >year ago and he seemed to have alot of conversion information. Check >the ham mags for his ad. > >73, Tim His Email is LOU@CBCINTL.COM Good luck! KC5MOP From lwbyppp@epix.net Fri Jan 26 13:48:52 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!starbase1.ping.ch!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!jussieu.fr!oleane!tank.news.pipex.net!pipex!newsfeed.internetmci.com!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet From: QRP%mimi@magic.itg.ti.com (D W Hemphill KC5NG) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need 10 meter conversion info for Cobra 148gtl Date: 19 Jan 1996 20:21:00 GMT Lines: 23 Message-ID: <4doufc$okg@mksrv1.dseg.ti.com> References: <4djt6j$32v$3@mhafn.production.compuserve.com> <4dkf20$dju@cloner3.netcom.com> NNTP-Posting-Host: dhemphill.dseg.ti.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 *snip* >There is a guy in AZ somewhere that advertises a book called CB to 10 >mtrs, I see the ad alot. I wrote for a catalog of his offerings about a >year ago and he seemed to have alot of conversion information. Check >the ham mags for his ad. *snip* The company goes by "CBCI". That is an acronym for "CB City International" They've been around for years, catering to the bootleg CB market. They sort of "morphed" into the ham market via CB-to-Ten conversions, since the technology is the same. The owner of this establishment is Lou Franklin, K6NA, who is one of the most prominent CB writers. 73 de KC5NG PS... I saw his catalog a number of years ago. His prices were, IMHO, astronomical!!! From lwbyppp@epix.net Fri Jan 26 13:48:53 1996 Path: news.epix.net!news.sprintlink.net!mhv.net!news.westnet.com!stevens-tech.edu!newsserver.jvnc.net!newsserver2.jvnc.net!howland.reston.ans.net!newsfeed.internetmci.com!gatech!purdue!news.bu.edu!transfer.stratus.com!bigboote.WPI.EDU!res.WPI.EDU!hi From: ee formerly known as jeff feigin Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need 10 meter conversion info for Cobra 148gtl Date: Tue, 23 Jan 1996 23:16:05 -0500 Organization: Worcester Polytechnic Institute Lines: 3 Message-ID: References: <4djt6j$32v$3@mhafn.production.compuserve.com> <4dkf20$dju@cloner3.netcom.com> <4doufc$okg@mksrv1.dseg.ti.com> NNTP-Posting-Host: res.wpi.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4doufc$okg@mksrv1.dseg.ti.com> i've seen the "kits," its $50 for a crystal. jeff From lwbyppp@epix.net Fri Jan 26 13:48:54 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!spool.mu.edu!news.sol.net!daily-planet.execpc.com!homer.alpha.net!pacifier!rainrgnews0!psgrain!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!newshost.convex.com!news.onramp.net!usenet From: Bob Winingham Newsgroups: rec.radio.amateur.homebrew Subject: Re: NEED APRS setup help Date: 25 Jan 1996 07:08:11 GMT Organization: On-Ramp; Individual Internet Connections; Dallas/Ft Worth/Houston, TX USA Lines: 21 Message-ID: <4e7a8s$ibs@news.onramp.net> References: <4dv48g$5g2@delta.misha.net> NNTP-Posting-Host: dal14.onramp.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) To: rsellers@misha.net X-URL: news:4dv48g$5g2@delta.misha.net >>I need assistance in getting an ICOM Z1A HT configured to my Kantronics KPC- 3 >>and laptop computer. I'm anew HAM and don't understand some of the >>configuration requirements like UNPROTO. Some guys here are trying to help, but >>no one is yet shall we say an expert with it yet. MFJ should have a cable for your radio to TNC I use same one for my HTX-202 and IC-W21AT The APRS experts have a SIG on TAPR.ORG called aprssig ( I am not an expert but I do have a set of notes on using the KPC-3 with a GPS as a remote tracker) set unprot to RELAY to get started then to a APRS digi station in your area. Some of the setups for APRS (PC) or MACAPRS will do this for you. 73 kc5ejk@onramp.net From lwbyppp@epix.net Fri Jan 26 13:48:56 1996 Path: news.epix.net!uunet!in2.uu.net!li.net!thom From: thom@newshost.li.net (Thom) Newsgroups: rec.radio.amateur.homebrew Subject: Need Help Indentifying Transistor Date: 21 Jan 1996 20:07:09 GMT Organization: LI Net (Long Island Network) Lines: 30 Message-ID: <4du6dd$q9j@linet02.li.net> NNTP-Posting-Host: linet01.li.net X-Newsreader: TIN [version 1.2 PL2] Hi and thanks in advance for your help, I am in the process of building a keyer and it calls for a 2N2222 transistor....In my junk box I've come accross several 2N2222A's. First off, Am I right in making this assumption that these are OK to use? The transistors I found are in a metal case wich and came in a package which says NPN TO-18...So I guess TO-18 is the case type. Its a metal case with a small tab coming out of the bottom...I see similar cases called TO-18 in the 1996 ARRL Handbook so I'm OK on that score, I think. Anyway my question is how do identify the leads? If I look down to the underside of the transistor and position the tab at 4 O'clock, the 3 leads are at 12, 6 and 9 O'clock. If you can can tell me which leads are the emmitter, collector and base I'd appreciate it...more importantly, if you could tell me how to figure it out, myself, I woun't have to bother you the next time. As I said I look in the Handbook, got close but couldn't find the answere. Thanks for ypur help Tom WB2QDG thom@li.net From lwbyppp@epix.net Fri Jan 26 13:48:57 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Help Indentifying Transistor Date: Wed, 24 Jan 1996 16:49:19 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 37 Message-ID: References: <4du6dd$q9j@linet02.li.net> <4e00lb$mv2@news.iii.net> <1996Jan23.183415.27278@ke4zv.atl.ga.us> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <1996Jan23.183415.27278@ke4zv.atl.ga.us> Hi Thom and Gary. Noted your comments regarding the plastic 2N2222 and metal can devices. All true what was said. I do want to put up a warning and that is the lead configuration is NOT the same. Be careful when you subsititute!! 73 Cliff Buttschardt W6HDO On Tue, 23 Jan 1996, Gary Coffman wrote: > In article <4e00lb$mv2@news.iii.net> "Thomas C. J. Sefranek" writes: > >Hi Thom > > The lead nearest the tab is the emitter, the lead farthest from > >the tab is the collector, the lead in between is the base. > >A 2N2222A is a better device, no one makes 2222's, only the A devices. > >Any specifications book (Motorola, Harris, National) has a wealth of > >information on transistors. Also, check the web sites for these guys. > > > >Tom > >WA1RHP > > The 2N2222 is still available (in plastic packaging) as far as I > know. And I've seen 2N2222s in TO-5 packaging, but I don't think > those are made anymore. For metal can packaging, I believe you're > correct that only the 2N2222A is currently produced. The main > difference is that the A device has a tighter beta specification > and is offered in the TO-18 cans. > > The 2N2222 family is *the* generic NPN switching transistor, though > the 2N3904 and 2N3906 are also very popular. For most uses, any of > the generic devices will work. > > Gary > -- > Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary > Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary > 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us > Lawrenceville, GA 30244 | | > > From lwbyppp@epix.net Fri Jan 26 13:48:58 1996 Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.swap Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news1.isp.net!news.internetMCI.com!newsfeed.internetmci.com!newsserver.jvnc.net!jvnc.net!ka1kjz From: ka1kjz@tigger.jvnc.net (Ronald C. Barnes) Subject: Need Novatel 8305A cellphone info badly Message-ID: Sender: news@tigger.jvnc.net (Zee News Genie) Organization: JvNCnet X-Newsreader: News Xpress Version 1.0 Beta #4 Date: Thu, 18 Jan 1996 22:46:48 GMT Lines: 16 Xref: news.epix.net rec.radio.amateur.digital.misc:13698 rec.radio.amateur.equipment:23944 rec.radio.amateur.homebrew:12838 rec.radio.amateur.misc:97106 rec.radio.swap:55621 Well, here I go again, I've been looking for this information for some time now and hopefully SOMEONE has SOMETHING. I have a few Novatel model 8305A cellular phones that I wish to convert over to 900MHz. They are black, square, about 10" x 10" x 2". At the very least I need a schematic, but full service information would be nice too. I understand that there was a Novatel Amateur Radio Club at one time and they did just this, converted them over to 900MHz for packet. Any info would be appreciated and I of course will pay costs of copying and shipping if necessary. Please reply via e-mail... ka1kjz@ix.netcom.com 73zzz Ron From lwbyppp@epix.net Fri Jan 26 13:48:59 1996 Path: news.epix.net!uunet!in1.uu.net!sunrise.gv.ssi1.com!oronet!news From: rst-engr@oro.net (Jim Weir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need PCB trace size to current info . Date: Sun, 21 Jan 1996 22:36:41 GMT Organization: RST Engineering Lines: 25 Message-ID: <4duf63$jna@hg.oro.net> References: <4dqvjl$148@news.usit.net> NNTP-Posting-Host: rst-engr.oro.net X-Newsreader: Forte Free Agent 1.0.82 secure1@usit.net wrote: >I need info on what trace size can handle in amps. Email at >secure1@usit.net Thanks ! (a) If you can't take the time to read the newsgroups you post in, don't post. Asking for email answers in a newsgroup wastes all our times in reading. (b) It is a function of the thickness of the copper on the board. For "one ounce" copper board, I've generally used 15 mils of copper width for each 100 mA of current and never had a problem. I'm sure when you get to current measured in amperes this rule of thumb breaks down, but for medium currents (less than an amp) it has always been OK for me. Jim Jim Weir VP Engineering | "We seem to be standing on RST Engineering | the foreskin of technology." Grass Valley CA 95945 | (Gen. Chuck Yeager) voice/fax 916/272-1432 | rst-engr@oro.net AR Adv WB6BHI CFI A&G/Comml Inst A&G/A&P/C-182A N73CQ From lwbyppp@epix.net Fri Jan 26 13:49:00 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: need schematic for HP 3310 Date: Wed, 24 Jan 1996 17:23:03 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 8 Message-ID: References: <3lau5n7$2i8_001@pcm.co.za> <4dpeg0$b75@ixnews8.ix.netcom.com> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Does anyone have a schematic for the Hewlett Packard function generator HP 3310? As I understand it, there were not too many made. I assume that I can fix the device with just a schematic and would appreciate knowing where I might obtain one. 73 Cliff Buttschardt W6HDO Cuesta College--Engineering Tech P. O. Box 8106 San Luis Obispo, CA 93406 TNX From lwbyppp@epix.net Fri Jan 26 13:49:01 1996 Path: news.epix.net!news.sprintlink.net!news.crd.ge.com!rebecca!rpi!gatech!newsfeed.internetmci.com!panix!not-for-mail From: ekv@panix.com (Elmar Vaher) Newsgroups: rec.radio.amateur.homebrew Subject: Need Toshiba S-AV17 amp module source Date: 24 Jan 1996 12:33:11 -0500 Organization: PANIX Public Access Internet and Unix, NYC Lines: 11 Message-ID: <4e5qgn$c7c@panix.com> NNTP-Posting-Host: panix.com Summary: Need parts supplier for Toshiba S-AV17 amp module. Keywords: Amp module source Toshiba Cant seem to find this module anywhere. Digi-Key or Mouser does not have it. This is for building the 2M brick in the 1996 Handbook. Toshiba S-AV17 amp module. Any help in getting a source as well as hints on building the brick would be greatly appreciated. -- Elmar Vaher ********--------********** ekv@panix.com From lwbyppp@epix.net Fri Jan 26 13:49:02 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!news.cinenet.net!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!swrinde!sdd.hp.com!col.hp.com!canyon.sr.hp.com!glenne From: glenne@sr.hp.com (Glenn Elmore) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Toshiba S-AV17 amp module source Date: 24 Jan 1996 23:10:33 GMT Organization: Hewlett Packard Sonoma County Lines: 23 Message-ID: <4e6e99$fiu@canyon.sr.hp.com> References: <4e5qgn$c7c@panix.com> NNTP-Posting-Host: n6gn.sr.hp.com X-Newsreader: TIN [version 1.2 PL2.2] Elmar Vaher (ekv@panix.com) wrote: : Cant seem to find this module anywhere. Digi-Key or Mouser does not have : it. : This is for building the 2M brick in the 1996 Handbook. : Toshiba S-AV17 amp module. : Any help in getting a source as well as hints on building the brick would : be greatly appreciated. Try RF Parts Inc in San Marcos, CA. They advertize in most of the major amateur magazines. They may even have PIN switches and other supporting hardware modules that they don't advertize. My 'hint' would be to interface to the brick(s) with a PC board and to be careful about getting good grounds; both in the contact between the brick itself and your heatsink and in the back side ground of the PC board you use. You should be able to transition directly to 50 ohm microstrip from the brick that way. Also, be sure to bypass and decouple your supplies well. It may be possible with some bricks to destroy them with low frequency oscillations. Glenn Elmore n6gn From lwbyppp@epix.net Fri Jan 26 13:49:03 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!globe.indirect.com!usenet From: jeffd@coriolis.com (Jeff Duntemann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: New Meter Faces Date: Tue, 23 Jan 1996 16:56:04 GMT Organization: The Coriolis Group, Inc. Lines: 13 Message-ID: <4e341r$dit@globe.indirect.com> References: <30FB54EA.7C40@interserf.net> <822036910.4791@pinetree.microserve.com> NNTP-Posting-Host: 165.247.88.102 X-Newsreader: Forte Free Agent 1.0.82 Probably a better way to create meter faces and other scales is to draw them by a simple computer program. Borland's Delphi product makes drawing and printing Windows graphics under program control very easy, and you can calculate the spacing of the lines and so on if you know your graphics math. Just a thought. --73-- --Jeff Duntemann KG7JF Scottsdale, Arizona From lwbyppp@epix.net Fri Jan 26 13:49:04 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!primus.ac.net!news.internetMCI.com!newsfeed.internetmci.com!gatech!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: thebots@aol.com (TheBots) Newsgroups: rec.radio.amateur.homebrew Subject: pc boards Date: 23 Jan 1996 23:33:14 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 2 Sender: root@newsbf02.news.aol.com Message-ID: <4e4cqa$bv3@newsbf02.news.aol.com> Reply-To: thebots@aol.com (TheBots) NNTP-Posting-Host: newsbf02.mail.aol.com Does anyone know of a supplier for bare copper-clad pc boards in odd sizes? From lwbyppp@epix.net Fri Jan 26 13:49:05 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr4ip51.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST UHF Noise generator Date: Tue, 23 Jan 1996 23:19:19 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 36 Distribution: world Message-ID: References: <199601202149.PAA26226@tri.net> <4e33h0$rg4@itchy.itsnet.com> NNTP-Posting-Host: usr4ip51.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4e33h0$rg4@itchy.itsnet.com> Allen Wallace writes: >From: Allen Wallace >Subject: Re: QST UHF Noise generator >Date: 23 Jan 1996 16:48:32 GMT [snip] >Yes. I know I'm cheap and ought to use the NoiseCom diode, however I >haven't purchased one yet! I do have a few 1N21 diodes and I was >wondering the how they compare. Not even close. >I figure I need to amplify a noise source of 20 ENR about 40-50 db to use >this as a broad-band signal source to use in lue of a tracking generator >for my spectrum analyzer. I think we discussed this idea here before and decided it wasn't as easy as it looks, but my memory is dram without a refresh these days. >The Mini-Circuts MAR-4 (8 db gain) only drops 0.2 db from 100 Mhz to 1500 >Mhz, and drops only another 0.3 do to 2000 Mhz. If I cascade 6 of these >babies, I'll get about 50 db of gain, however any more and I'll exceep >the 1db compression. This would give me a flat noise source with less >than 2 db of dropoff. You better take a look at the effects of the mismatches between a handful of these things. The specified 1.6 in and 2.0 out SWRs look like cascaded ripple trouble to me. I have only the tabular data in front of me but I note that the figures are "typical". Your mileage (and gain) may vary. >Maybe I'll try a MAV-11 MMIC as the final amplifer, as it has a 18 dbm >max power, but it is not very flat. >Has any one had any experience with this sort of thing? From lwbyppp@epix.net Fri Jan 26 13:49:06 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!spool.mu.edu!howland.reston.ans.net!gatech!newsxfer2.itd.umich.edu!agate!holonet!colossus.holonet.net!woodybbs!9!1:2619/211!ian.simcock From: ian.simcock%1:2619/211.9 (ian simcock%1:2619/211.9) Date: 21 Jan 96 12:26:54 Newsgroups: rec.radio.amateur.homebrew Subject: Radio circuit required Message-ID: Organization: WoodyWare Software, Inc. Lines: 41 To: ian simcock%1:2619/211.9%12:320/100.666 From: simcock@adam.com.au (ian simcock) Subject: Radio circuit required I'm hopeing that someone could point me to either 1) An Internet site with circuit diagrams 2) A book with appropriate circuits 3) A person who could design an appropriate circuit 4) A company that sells what I want. What I need is a small radio that fits the following specs - 1) Any frequency (preferably an unlicenced peice of spectrum) 2) Digital transmition of 500 bytes per second 3) 200 meter range under bad indoor conditions 4) Digital tuning 5) Runs on 4-6 volts 6) Low power consumption 7) Rapid startup/shut down for the transmiter 8) 10 channels If possible I'd like the following improvements 1) 1000+ bytes per second 2) 500+ meter range 3) Run on 3-6 Volts 4) 30+ channels 5) Able to easily transmit analogue (voice) signals Thanks for reading this far. I'll appriciate any help anyone can give me, Ian Simcock. # Origin: WoodyWare Software, Inc. <-> Internet Gateway (1:2619/211.9) # Origin: Gateway ARNet <-> HamNet by HB9EBW (12:320/100.666) -- |Fidonet: ian simcock%1:2619/211.9 2:301/249.666 |Internet: ian.simcock%1:2619/211.9 | | Standard disclaimer: The views of this user are strictly his own. From lwbyppp@epix.net Fri Jan 26 13:49:07 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ksu.ksu.edu!hptemp1.cc.umr.edu!dstuart From: dstuart@saucer.cc.umr.edu (Dave Stuart (dstuart@umr.edu)) Newsgroups: rec.radio.amateur.homebrew Subject: Recieve Antenna Date: 24 Jan 1996 18:00:47 GMT Organization: UMR Missouri's Technological University Lines: 9 Message-ID: <4e5s4f$lk1@hptemp1.cc.umr.edu> NNTP-Posting-Host: saucer.cc.umr.edu X-Newsreader: TIN [version 1.2 PL2] For approximately 100 MHz, a good antenna would be around 1.5 m. Right? -- -- Dave Stuart dstuart@umr.edu University of Missouri -- Rolla KB0SLY From lwbyppp@epix.net Fri Jan 26 13:49:08 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!zippy.cais.net!news From: Jim Sutton/AC4CZ Newsgroups: rec.radio.amateur.homebrew Subject: Relays That Hum Date: 25 Jan 1996 19:19:44 GMT Organization: Capital Area Internet Service info@cais.com 703-448-4470 Lines: 8 Message-ID: <4e8l4g$qc@zippy.cais.net> NNTP-Posting-Host: pppb47.erols.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) I have several 115 ac relays that at times produce an objectional hum. The co il wire looks like #28 to perhaps #32 and the dc resistance varies from 75 to 85 ohms. Any thoughts on the voltage/current likely to required to operate on dc? Thanks for your help. 73/Jim Sutton/AC4CZ jsutton@erols.com From lwbyppp@epix.net Fri Jan 26 13:49:09 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news1!ind-005-236-207 From: mai@iquest.net (Patrick Croft) Subject: RG63/B COAX - OHMS=? X-Nntp-Posting-Host: ind-005-236-207.iquest.net Message-ID: Sender: news@iquest.net (News Admin) Organization: IQuest Network Services X-Newsreader: News Xpress Version 1.0 Beta #2.1 Date: Thu, 25 Jan 1996 17:07:11 GMT Lines: 6 Seeking a little help on tech spec's of this stuff. Have checked all handbook s, major manufacturer's catalogs back thru the 60's, can't find it! This is TI MES brand, but not in their catalog either. If you can shed some light I'd really apprec iate it! 73 Patrick WB9IQI From lwbyppp@epix.net Fri Jan 26 13:49:10 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!imci4!imci5!newsfeed.internetmci.com!in2.uu.net!jaxnet.jaxnet.com!usenet From: "John R. Moore" Newsgroups: rec.radio.amateur.homebrew Subject: Re: RG63/B COAX - OHMS=? Date: Thu, 25 Jan 1996 20:56:25 -0500 Organization: Southeast Network Services, Inc. Lines: 11 Message-ID: <310834C9.60C1@jaxnet.com> References: NNTP-Posting-Host: ts5-024.jaxnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6b (Win16; I) Patrick Croft wrote: > > Seeking a little help on tech spec's of this stuff. Have checked all handbo oks, > major manufacturer's catalogs back thru the 60's, can't find it! This is TIMES brand, > but not in their catalog either. If you can shed some light I'd really appr eciate it! > > 73 > Patrick WB9IQIPatrick according to my book RG-63B impedance is 125 ohms Capacitance is 10 pf/ft 6.4 db loss per 100 ft at 1000 mhz. John W5HUQ From lwbyppp@epix.net Fri Jan 26 13:49:11 1996 Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!news.zeitgeist.net!mycogen.terminus.com!usenet From: dhayes@seldon.terminus.com (Dave Hayes) Newsgroups: rec.radio.amateur.homebrew Subject: Re: RG63/B COAX - OHMS=? Date: Fri, 26 Jan 1996 01:21:30 GMT Organization: Second Foundation Internet, Lompoc, CA (805) 733-1849 Lines: 17 Message-ID: <3108270e.1429093@news> References: NNTP-Posting-Host: pm-lo-36.terminus.com X-Newsreader: Forte Agent .99c/16.141 mai@iquest.net (Patrick Croft) wrote: >Seeking a little help on tech spec's of this stuff. Have checked all handboo ks, > major manufacturer's catalogs back thru the 60's, can't find it! This is T IMES brand, >but not in their catalog either. If you can shed some light I'd really appre ciate it! > >73 >Patrick WB9IQI The 1956 edition of Reference Data for Engineers lists the following specifications for RG63B/U coaxial cable: Type - low capacitance single braid Nominal impedance - 125 ohms capacitance 10 pf/ft. dielectric material - air spaced polyethylene velocity .84c From lwbyppp@epix.net Fri Jan 26 13:49:12 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: jeffa@ix.netcom.com(Jeff Anderson) Newsgroups: rec.radio.amateur.homebrew Subject: Switch-mode audio amps Date: 24 Jan 1996 13:29:29 GMT Organization: Netcom Lines: 10 Message-ID: <4e5c7p$8rl@cloner2.ix.netcom.com> NNTP-Posting-Host: pax-ca3-15.ix.netcom.com X-NETCOM-Date: Wed Jan 24 5:29:29 AM PST 1996 I'd like to build a switch-mode amp that can deliver, say, about 2 watts to a 3.2 ohm speaker (it'll be powered by 12 volts). Does anyone know where to find articles or references discussing these types of amps? Ed Oxner's "Power FETs" book discusses them a bit, but I'd like more info. Thanks! - Jeff, WA6AHL From lwbyppp@epix.net Fri Jan 26 13:49:12 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!swrinde!news-relay.us.dell.com!pmafire!anlpub.anlw.anl.gov!borah.ebr.anlw.anl.gov!jmott From: Jack Mott Newsgroups: rec.radio.amateur.homebrew Subject: test Date: Wed, 24 Jan 1996 23:08:25 -0700 Organization: Argonne National Laboratory West Lines: 1 Message-ID: NNTP-Posting-Host: borah.ebr.anlw.anl.gov Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII This is only a test. From lwbyppp@epix.net Fri Jan 26 13:49:14 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!zippy.cais.net!news From: jsutton@erols.com Newsgroups: rec.radio.amateur.homebrew Subject: Test Posting Date: 25 Jan 1996 19:05:02 GMT Organization: Capital Area Internet Service info@cais.com 703-448-4470 Lines: 2 Message-ID: <4e8k8u$j6@zippy.cais.net> NNTP-Posting-Host: pppb47.erols.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) This is a test posting. Jim/AC4CZ From lwbyppp@epix.net Fri Jan 26 13:49:15 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!primus.ac.net!news.cais.net!zippy.cais.net!news From: jsutton@erols.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Test Posting Date: 25 Jan 1996 19:11:15 GMT Organization: Capital Area Internet Service info@cais.com 703-448-4470 Lines: 7 Message-ID: <4e8kkj$n0@zippy.cais.net> References: <4e8k8u$j6@zippy.cais.net> NNTP-Posting-Host: pppb47.erols.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) > jsutton@erols.com writes: > This is a test posting. > Jim/AC4CZ > >>>> Follow up to msg. JCS/AC4CZ From lwbyppp@epix.net Fri Jan 26 13:49:15 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!news.uoregon.edu!news.rio.com!usenet From: molsen@rio.com (Monte Olsen) Newsgroups: rec.radio.amateur.homebrew Subject: TNC for Kenwood th22a and/or 520S HF rig? Date: Sun, 21 Jan 1996 19:36:13 GMT Organization: Northwest Internet Services, Inc. Lines: 12 Message-ID: <31029569.53352539@206.96.130.1> Reply-To: molsen@rio.com NNTP-Posting-Host: p14.t0.rio.com X-Newsreader: Forte Agent .99c/16.141 Hi all, Does anyone know of a TNC and modem kit for a handheld TH22AT and a Kenwood TS-520S. One that might work with both? Packet radio sure sounds interesting. thanks for any info. Monte Olsen N7FFO From lwbyppp@epix.net Fri Jan 26 13:49:16 1996 Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet From: cwhiffen@atl.mindspring.com (Clay Whiffen) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Toroid permeability ??? Date: Tue, 23 Jan 1996 02:50:06 GMT Organization: MindSpring Enterprises, Inc. Lines: 15 Message-ID: <4e1ibe$ons@stealth.mindspring.com> References: <8221045958701@lss.humnet.humberc.on.ca> <4dvntf$mqi@info4.rus.uni-stuttgart.de> Reply-To: cwhiffen@atl.mindspring.com NNTP-Posting-Host: user-168-121-82-155.dialup.mindspring.com X-Newsreader: Forte Free Agent 1.0.82 moritz@ipers1.e-technik.uni-stuttgart.de () wrote: >>....but some surplus stores in Toronto have a wide >>assortment of bins of unmarked toroids. It would be a nice >>cost-effective altenative to having to order new ones if we knew what we >>had sitting at our doorstep. >May be I am wrong, But I expect that 99% of surplus toroids >are intended for frequencies below 1 MHz (switch mode PSU's?) >73, Moritz DL5UH > I have found lots of different kinds here. -43 ferrites, powered iron, etc. From lwbyppp@epix.net Fri Jan 26 13:49:17 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.netnet.net!en.com!wariat.org!eff!news.umbc.edu!europa.chnt.gtegsc.com!news.uoregon.edu!hpg30a.csc.cuhk.hk!news.cuhk.edu.hk!agate!spool.mu.edu!howland.reston.ans.net!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Toroid permeability ??? Message-ID: <1996Jan20.170525.12147@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <8221045958701@lss.humnet.humberc.on.ca> Date: Sat, 20 Jan 1996 17:05:25 GMT Lines: 40 In article <8221045958701@lss.humnet.humberc.on.ca> hduff@humnet.humberc.on.ca (Hugh Duff) writes: >Does anyone know how to measure the permeability/loss of a toroid core >(without too much difficulty !) ? >They are difficult to get locally ( I usually have to order them from >Amidon in Cal.) but some surplus stores in Toronto have a wide >assortment of bins of unmarked toroids. It would be a nice >cost-effective altenative to having to order new ones if we knew what we >had sitting at our doorstep. > >A friend on a local BBS originally posed this question to me... >I couldn't really answer him ...I am also curious ! >I thought that winding some wire onto them and taking impedance >measurements at various frequencies may work but how does one accomplish >this ? What you want to do, Hugh, is find the proportionality constant between the number of turns and inductance. Wind the core with several different numbers of turns, and measure the inductance for each. You can use an inductance meter, or just resonate the coil with a known capacitor and use a dip meter. Now graph the inductance versus the number of turns and devise an equation to fit the curve. The inductance should be proportional to the square of the number of turns, with the proportionality constant being the unkown you are trying to find. L = k * (N)^2 or k = L/(N)^2 To determine the suitability of the material for various frequencies, excite the coil at those frequencies and measure the Q of the coil. Actually, the size of the proportionality constant you found above should already give you a clue. A large proportionality constant indicates a core suitable for low frequencies while smaller proportionality constants will indicate the core is suitable for increasingly higher frequencies. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Jan 26 13:49:19 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: mjsilva@ix.netcom.com(michael silva) Newsgroups: rec.radio.amateur.homebrew Subject: Re: tuning in CW/SSB stations w/ AM only radio? Date: 22 Jan 1996 22:17:20 GMT Organization: Netcom Lines: 16 Message-ID: <4e12dg$18f@cloner3.netcom.com> References: <4d7dvb$m8b@detroit.freenet.org> <4dpacu$bjf@ixnews4.ix.netcom.com> <4e0skc$dm9@linus.mitre.org> NNTP-Posting-Host: ix-wc4-04.ix.netcom.com X-NETCOM-Date: Mon Jan 22 2:17:20 PM PST 1996 In <4e0skc$dm9@linus.mitre.org> Jason Douglas >Mike: You're far more ambitious than I. I used to just take a little >portable AM radio and vary the tuning until its LO was heterodyning >with something in the target receiver. I admit that's pretty lazy, >but it works. Regards, >John Kelly K4XC Well, I don't know about ambitious. I just had a lot more 6AU6s than portable radios :) I was one of those kids who became an old-TV magnet when I was growing up. So many tubes to pull, so many components to unsolder, so many rivets to drill out... 73, Mike, KK6GM From lwbyppp@epix.net Fri Jan 26 13:49:19 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!decwrl!tribune.usask.ca!rover.ucs.ualberta.ca!culserv1.cul.ca!missun.cus.cul.ca!usenet From: VillyM@cus.cul.ca Newsgroups: rec.radio.amateur.homebrew Subject: Re: tuning in CW/SSB stations w/ AM only radio? Date: 23 Jan 1996 18:51:01 GMT Organization: Canadian Utilities Ltd Lines: 14 Message-ID: <4e3aml$k8e@missun.cus.cul.ca> References: <4d7dvb$m8b@detroit.freenet.org> Reply-To: VillyM@cus.cul.ca NNTP-Posting-Host: 141.118.145.108 X-Newsreader: IBM NewsReader/2 v1.02 In , mack@ncifcrf.gov (Joe Mack) writes: >I did this when I was a kid, tuning in hams on a SW receiver >before I got my ham license. You don't need a crystal oscillator, >any oscillator will do and I just draped a wire from the oscillator >into the back of the box of the radio - no solid connection. > > I did it by adding regeneration to the last iF stage, and then advancing the gain until it just started to oscillate. Worked, and even dramatically increased the sel ectivity... Villy VE6SQ From lwbyppp@epix.net Fri Jan 26 13:49:20 1996 Path: news.epix.net!news.sprintlink.net!cc.iu.net!news From: blombard@iu.net (Bob Lombardi) Newsgroups: rec.radio.amateur.homebrew Subject: Re: tuning in CW/SSB stations w/ AM only radio? Date: 25 Jan 1996 01:44:03 GMT Organization: Organized? I can't even find my car keys Lines: 29 Message-ID: <4e6n93$e3b@cc.iu.net> References: <4d7dvb$m8b@detroit.freenet.org> <4e3aml$k8e@missun.cus.cul.ca> NNTP-Posting-Host: netport-45.iu.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 In article <4e3aml$k8e@missun.cus.cul.ca>, VillyM@cus.cul.ca says... > >In , mack@ncifcrf.gov (Joe Mack) writes: >>I did this when I was a kid, tuning in hams on a SW receiver >>before I got my ham license. You don't need a crystal oscillator, >>any oscillator will do and I just draped a wire from the oscillator >>into the back of the box of the radio - no solid connection. >> >> >I did it by adding regeneration to the last iF stage, and then advancing the gain until >it just started to oscillate. Worked, and even dramatically increased the selectivity... > > > > >Villy VE6SQ Sounds like my Heathkit Q Multiplier from 1967. Remember those? -- Bob Lombardi WB4EHS in Melbourne, FL o \---\---\ blombard@iu.net or blombard@freenet.fsu.edu /\ | Telescope making, optics, astronomy, piano, bicycling -\ 7 & radio | I've run out of things I can say in 4 lines. (*)/(*) | From lwbyppp@epix.net Fri Jan 26 13:49:21 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!enews.sgi.com!decwrl!news-server.ncren.net!news.duke.edu!usenet From: jimbob@acpub.duke.edu (James P. Meyer) Newsgroups: rec.radio.amateur.homebrew Subject: Re: varator diodes Date: Tue, 23 Jan 1996 03:24:27 GMT Organization: Duke University, Durham, NC, USA Lines: 18 Message-ID: <310453c0.7238895@news.duke.edu> References: <9601221149.AA09737@eagle.rtc-waterford.ie> NNTP-Posting-Host: async5.async.duke.edu X-Newsreader: Forte Agent .99c/16.141 daly@eagle.rtc-waterford.IE (progen et2) wrote: >Does anyone have a source of varator diodes. >I want to build tripler to 23cm, but cannot find definite source for >varator diodes. (BAY66???) any info would be appreciated! >Thanks in advance. This may sound crazy, but measurements with a network analyzer show that green LEDs make excellent, high Q, varactors. You should dip the LEDs in black paint to prevent ambient light from getting to the junction though. BTW, green LEDs are fabricated out of the same material that many microwave transistors and diodes are, gallium arsinide. Jim From lwbyppp@epix.net Fri Jan 26 13:49:22 1996 Path: news.epix.net!news.sprintlink.net!news-relay.eworld.com!uunet!in1.uu.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: daly@eagle.rtc-waterford.IE (progen et2) Newsgroups: rec.radio.amateur.homebrew Subject: varator diodes Date: 22 Jan 96 11:49:07 GMT Organization: ucsd usenet gateway Lines: 9 Message-ID: <9601221149.AA09737@eagle.rtc-waterford.ie> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Does anyone have a source of varator diodes. I want to build tripler to 23cm, but cannot find definite source for varator diodes. (BAY66???) any info would be appreciated! Thanks in advance. Warren EI6ETB daly@eagle.rtc-waterford.ie From lwbyppp@epix.net Fri Jan 26 13:49:23 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!zombie.ncsc.mil!news.duke.edu!godzilla5.acpub.duke.edu!jimbob From: "James P. Meyer" Newsgroups: rec.radio.amateur.homebrew Subject: Re: varator diodes Date: Tue, 23 Jan 1996 16:28:26 -0500 Organization: Duke University, Durham, NC, USA Lines: 29 Message-ID: References: <199601231923.AA164505001@hplsnb.lsid.hp.com> NNTP-Posting-Host: godzilla5.acpub.duke.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <199601231923.AA164505001@hplsnb.lsid.hp.com> On Tue, 23 Jan 1996, Tom Bruhns wrote: > : This may sound crazy, but measurements with a network analyzer show > : that green LEDs make excellent, high Q, varactors. You should dip the > : LEDs in black paint to prevent ambient light from getting to the junction > : though. > > Well, you're sure right, it sounds a bit crazy! Do you have more info on > this? My boss spent all night measuring "real" varactors and every other kind of diode he could find. Results showed green LEDs with the highest Q (lowest series R) of all. Cap ranges around 10 to 5 pF and useable to a reverse bias of 10 to 15 volts. I failed to make the connection between the varactor number given and the requirement for any real power. LEDs *would* be limited to the milliwatt range. We used them in VCOs and VCXOs. > range, centered in the VHF and UHF ranges, and finding low capacitance > varactors with good Q has been difficult. But I also suspect the green > LEDs will have large enough area that they won't be particularly low > capacitance. Try one and see. You may be as pleasantly surprised as I was. Jim From lwbyppp@epix.net Fri Jan 26 13:49:24 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!plug.news.pipex.net!pipex!weld.news.pipex.net!pipex!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!in1.uu.net!news.accessus.net!news From: dwentz@basenet.net (Dale Wentz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: varator diodes Date: 25 Jan 1996 01:30:08 GMT Organization: Me Myself And I Lines: 22 Message-ID: <4e6mf0$24l@news.accessus.net> References: <9601221149.AA09737@eagle.rtc-waterford.ie> NNTP-Posting-Host: bville-pm2-1/115.accessus.net Mime-Version: 1.0 X-Newsreader: WinVN 0.99.3 In article <9601221149.AA09737@eagle.rtc-waterford.ie>, daly@eagle.rtc-waterford.IE says... > >Does anyone have a source of varator diodes. >I want to build tripler to 23cm, but cannot find definite source for >varator diodes. (BAY66???) any info would be appreciated! >Thanks in advance. > >Warren EI6ETB > >daly@eagle.rtc-waterford.ie > Try Marlin P. Jones & Assoc. Inc. 1-800-652-6733 Thay have Matched Sets of 3 Varactors MV1662 Motorola 15VDC Max REv 400ma Nax forward I Capacitance 225pf min 250pf Norm @ 4.0 Vr, Cap ratio=2.3@vr2-15VDC The only Bad thing is that thay have a 15.00 Min order. Hope this help KB9JJA/Dale From lwbyppp@epix.net Fri Jan 26 13:49:25 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: smaas@aol.com (SMaas) Newsgroups: rec.radio.amateur.homebrew Subject: Re: varator diodes Date: 25 Jan 1996 20:15:15 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 17 Sender: root@newsbf02.news.aol.com Message-ID: <4e99v3$pcq@newsbf02.news.aol.com> References: <4e6mf0$24l@news.accessus.net> Reply-To: smaas@aol.com (SMaas) NNTP-Posting-Host: newsbf02.mail.aol.com In article <9601221149.AA09737@eagle.rtc-waterford.ie>, daly@eagle.rtc-waterford.IE says... > >Does anyone have a source of varator diodes. >I want to build tripler to 23cm, but cannot find definite source for >varator diodes. (BAY66???) any info would be appreciated! >Thanks in advance. > >Warren EI6ETB Why mess with varactors? They're a pain in the tush. Hard to get them working, and prone to weird oscillations. Build a bipolar tripler; lots of good devices at 1 GHz. Also, even better to start lower in frequency, if possible, and use two doublers. Steve W5VHJ From lwbyppp@epix.net Fri Jan 26 13:49:26 1996 Path: news.epix.net!news.sprintlink.net!cc.iu.net!news From: blombard@iu.net (Bob Lombardi) Newsgroups: rec.radio.amateur.homebrew Subject: Re: varator diodes Date: 26 Jan 1996 00:57:41 GMT Organization: Organized? I can't even find my car keys Lines: 37 Message-ID: <4e98u5$5mh@cc.iu.net> References: <9601221149.AA09737@eagle.rtc-waterford.ie> NNTP-Posting-Host: netport-52.iu.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 In article <9601221149.AA09737@eagle.rtc-waterford.ie>, daly@eagle.rtc-waterfo rd.IE says... > >Does anyone have a source of varator diodes. >I want to build tripler to 23cm, but cannot find definite source for >varator diodes. (BAY66???) any info would be appreciated! >Thanks in advance. > >Warren EI6ETB > >daly@eagle.rtc-waterford.ie > Don't have a source for those, but here's a thought for you. A guy who is more clever than I am decided that all diodes have those properties, and the only difference was that varactors were specially doped to emphasize them. So he made a "varactor" tripler out of some 1N914 diodes. Worked fine, but I think he said they were a little lossier. That was about 12 or 15 years ago, and I think it was even a commercial product, so it was repeatable. The guy was WA4GHK. 73, Bob -- Bob Lombardi WB4EHS in Melbourne, FL o \---\---\ blombard@iu.net or blombard@freenet.fsu.edu /\ | Telescope making, optics, astronomy, piano, bicycling -\ 7 & radio | I've run out of things I can say in 4 lines. (*)/(*) | From lwbyppp@epix.net Fri Jan 26 13:49:27 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!enews.sgi.com!decwrl!news-server.ncren.net!news.duke.edu!usenet From: jimbob@acpub.duke.edu (James P. Meyer) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WANTED: 72 ohm twinlead Date: Tue, 23 Jan 1996 03:28:08 GMT Organization: Duke University, Durham, NC, USA Lines: 18 Message-ID: <31045517.7581956@news.duke.edu> References: <4dueps$he1@venus.texoma.com> NNTP-Posting-Host: async5.async.duke.edu X-Newsreader: Forte Agent .99c/16.141 Gary Stone wrote: >My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead >for a balun on an antenna project. I know very little of the project, >but he does not have internet and I wanted to try and locate a source for >him. For just 3 feet, he would be better off making the twinlead himself out of copper or aluminum tubing. The diameter and spacing should be easy to calculate or adjust from measurements. In the olden days, that's the way *real* hams did everything. 8-) Jim From lwbyppp@epix.net Fri Jan 26 13:49:27 1996 Path: news.epix.net!uunet!in2.uu.net!news.texoma.com!usenet From: Gary Stone Newsgroups: rec.radio.amateur.homebrew Subject: WANTED: 72 ohm twinlead Date: 21 Jan 1996 22:30:20 GMT Organization: Internet Texoma, Inc. Lines: 24 Message-ID: <4dueps$he1@venus.texoma.com> NNTP-Posting-Host: ppp109.texoma.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Greetings, My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead for a balun on an antenna project. I know very little of the project, but he does not have internet and I wanted to try and locate a source for him. Any ideas? Please e-mail response if possible. Thanks and 73, Gary -- /\__/\ Gary and Karen Stone (Gary N5PHT) 0 0 E-Mail: garystone@texoma.com @ or karenstone@texoma.com (_/\_) Http://home.texoma.com/personal/garystone/ ~~ From lwbyppp@epix.net Fri Jan 26 13:49:29 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.crl.com!crl.crl.com!not-for-mail From: dmiller@crl.com (Donald J. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WANTED: 72 ohm twinlead Date: 24 Jan 1996 06:16:42 -0800 Organization: CRL Network Services (415) 705-6060 [Login: guest] Lines: 28 Message-ID: <4e5f0a$km6@crl.crl.com> References: <4dueps$he1@venus.texoma.com> <4e0h1c$shi@newshost.lanl.gov> NNTP-Posting-Host: crl.com X-Newsreader: TIN [version 1.2 PL2] Jim Devenport (jdevenport@lanl.gov) wrote: : 3 feet? I could mail him some but the postage would exceed the : value of the twinlead. We have found 72 ohm twinlead to be : fairly difficult to locate and when we finally did we bought a : spool. For short HF uses many varieties of common 2-wire AC : "ZIP" cord closely approach 72-75 ohms impedance. Perhaps that : would work for his application. Caution would need to be exercised if the application occurs at full legal power. If the design of the matching network is such that standing waves occur in the transmission line during normal operation, dielectric breakdown on the zipcord could occur. My previous post concerning the realizability of 72 ohm twinlead assummed an air dielectric. Zip cord, of course has some type of synthetic rubber or plastic with a dielectric constant greater than air. Later, -- ------------------------------------------------- Don Miller dmiller@crl.com ------------------------------------------------- From lwbyppp@epix.net Fri Jan 26 13:49:30 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: WANTED: 72 ohm twinlead Date: Tue, 23 Jan 1996 17:19:46 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 25 Message-ID: References: <4dueps$he1@venus.texoma.com> <31045517.7581956@news.duke.edu> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <31045517.7581956@news.duke.edu> Belden still makes this twinlead. They also make 150 ohm material which is also of use in baluns..73 Cliff Buttschardt W6HDO On Tue, 23 Jan 1996, James P. Meyer wrote: > Gary Stone wrote: > > >My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead > >for a balun on an antenna project. I know very little of the project, > >but he does not have internet and I wanted to try and locate a source for > >him. > > For just 3 feet, he would be better off making the twinlead > himself out of copper or aluminum tubing. The diameter and spacing should > be easy to calculate or adjust from measurements. > > In the olden days, that's the way *real* hams did everything. > > 8-) > > Jim > > > > From lwbyppp@epix.net Fri Jan 26 13:49:31 1996 Path: news.epix.net!news.sprintlink.net!whidbey.!usenet From: subbustr@whidbey.net (DAVE M . SCHERTZER) Newsgroups: rec.radio.amateur.homebrew Subject: WD-40 vice Contact/Tuner Spray!! Date: 25 Jan 1996 03:27:50 GMT Organization: DND CF DET Whidbey Is. WA Lines: 8 Message-ID: <4e6tbm$hdv@whidbey.whidbey.com> NNTP-Posting-Host: asn94.whidbey.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.11 Use WD-40 on my mobile rig to fix a LCD prob and it worked!!!! Tried contact/tuner spray and had to re-apply every 2 weeks, WD-40 no probs fer the last 6 months..works fine in a pinch..... de ve7-lfa From lwbyppp@epix.net Fri Jan 26 13:49:32 1996 Path: news.epix.net!news.sprintlink.net!i-2000.com!usenet From: dougrand@i-2000.com (Prowler) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WD-40 vice Contact/Tuner Spray!! Date: Fri, 26 Jan 1996 01:23:20 GMT Organization: I-2000 Inc. - Internet Services Lines: 28 Message-ID: <4e9a5d$c08@i-2000.com> References: <4e6tbm$hdv@whidbey.whidbey.com> NNTP-Posting-Host: dougrand.dh.i-2000.com X-Newsreader: Forte Free Agent 1.0.82 WD-40 is great stuff. I used to work building bridges and several times my walkie talkie (ham) fell into the salt water. My standard procedure was to leave it where it fell, remembering where it was. I would go back after work with SCUBA, retrieve the radio and put it into a bucket of water from the bay. Then upon returning home, I would dip the radio into alcohol and blow it out with air pressure. I did that several times until I was sure all the water I could get to was displaced. Then, I would spray it full of WD-40 and blow it out again, doing this at least two times to get the WD-40 into all the crevices. I never damaged a radio and did this at least 4 times with one unit. Only the battery wire from the terminal to the battery would burn out while it was under water. I would take the radio to work the next day. Doug KN2Y subbustr@whidbey.net (DAVE M . SCHERTZER) wrote: xxUse WD-40 on my mobile rig to fix a LCD prob and xxit worked!!!! Tried contact/tuner spray and had to xxre-apply every 2 weeks, WD-40 no probs fer the xxlast 6 months..works fine in a pinch..... xxde ve7-lfa xx From lwbyppp@epix.net Fri Jan 26 13:49:33 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!news.ums.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Winding torroids - wire gage? Message-ID: <1996Jan20.164504.12026@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4djt6j$32v$3@mhafn.production.compuserve.com> <4dmuoa$gi@ixnews6.ix.netcom.com> Date: Sat, 20 Jan 1996 16:45:04 GMT Lines: 41 In article <4dmuoa$gi@ixnews6.ix.netcom.com> timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI ) writes: > >Im looking at building several QRP projects, they all call for >different size wire on the torroids, usually #26,#28,#30 is there a >formula for figureing out different gage wire substitutes? > >I dont mind buying a spool or two of the different sizes but if the >spec calls for 30 turns of #28 on a T60-6 can you put more or less >turns of #26 and get the same results. Why the different sizes? For a *space* wound coil on a core, the size of the wire is determined primarily by the amount of current it must handle. Thus for higher currents, larger gage wire is chosen. (Note for RF it is skin effect resistance that counts here.) For a *close* wound coil on a core, it is the number of turns that will *fit* on the core that determines gage. Obviously, more turns of wire can be put on a given size core if the wire is of smaller diameter. (Multilayer and scramble wound cores are grossly different than the single layer type we're discussing of course.) If neither of these limits is a concern, then it is only the number of turns (and the core material of course) that determines inductance, not the wire gage. (There are, usually minor, factors beyond the number of turns that determine final inductance. The spacing of turns affects the turn to turn capacitance, so spreading or compressing turns on the core has the effect of varying effective inductance. Different gages may allow *room* for more or less of this spreading and compressing.) Air core coils have different constraints having to do with length to diameter ratios, flux leakage, and the like, which complicate the picture. You can largely ignore these issues with toroids as long as you use the specified core. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Jan 26 13:49:34 1996 Path: news.epix.net!news.sprintlink.net!news.netnet.net!en.com!in-news.erinet.com!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Winding torroids - wire gage? Date: 19 Jan 1996 18:38:46 GMT Organization: Hewlett Packard Corvallis Site Lines: 27 Message-ID: <4doofm$h48@hpcvsnz.cv.hp.com> References: <4dmuoa$gi@ixnews6.ix.netcom.com> NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Tim Hynde ka8ddz/qrp Rochester, MI (timhynde@ix.netcom.com) wrote: : Im looking at building several QRP projects, they all call for : different size wire on the torroids, usually #26,#28,#30 is there a : formula for figureing out different gage wire substitutes? : I dont mind buying a spool or two of the different sizes but if the : spec calls for 30 turns of #28 on a T60-6 can you put more or less : turns of #26 and get the same results. Why the different sizes? The wire size won't affect the inductance significantly. Inductance depends on the particular core, and in general, for a given core, the inductance increases as the square of the number of turns: double the number of turns and the inductance multiplies by 4. That's true for air- core coils, too, if you wind the wire in the same space..same diameter and length, but more turns (of smaller wire). But for toroid cores, you wouldn't want to try to put more turns through the center than will fit. For RF work, general practice seems to be to keep it to a single layer, so you'd want to go smaller in wire size if the original had things packed tight around the core already. If you get an information packet from Amidon, it will probably have a table of number of turns of various wire sizes versus core size. In general, you want to use the largest wire you can for a given core and winding geometry (i.e. single layer), to keep resistance low and Q high. But in air-core coils at RF, it's usually important to space the turns apart from eachother to keep distributed capacitance under control. From lwbyppp@epix.net Fri Jan 26 13:49:35 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!nntp.earthlink.net!usenet From: hepc@earthlink.net (Todd Owen) Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew Subject: WTB & FS UHF Crystals Date: Wed, 24 Jan 1996 01:34:51 GMT Organization: Earthlink Network, Inc. Lines: 21 Message-ID: <4e4254$p26@bolivia.it.earthlink.net> NNTP-Posting-Host: pool021.max8.washington.dc.dynip.alter.net X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.swap:55723 rec.radio.amateur.homebrew:12870 I have transmit and receive crystals for the following frequencies: 457.525, 457.550, 457.575, 457.600 MHz I am looking for a transmit and receive crystal for any frequency in a 440-450MHz simplex band such as 445.000, 445.100, 445.150 MHz, etc.... I will trade all of the 457 MHz crystals for the 445MHz set. --73, Todd KE4UDN ----------------------------------------------------------------- Todd Owen Hanover Engineers, P.C. Richmond, VA 804-730-0011 ke4udn@amsat.org ----------------------------------------------------------------- From lwbyppp@epix.net Fri Jan 26 13:49:36 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: rickn76227@aol.com (RickN76227) Newsgroups: rec.radio.amateur.homebrew Subject: WTB-Western Electric Date: 24 Jan 1996 11:12:29 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 4 Sender: root@newsbf02.news.aol.com Message-ID: <4e5lpd$23h@newsbf02.news.aol.com> Reply-To: rickn76227@aol.com (RickN76227) NNTP-Posting-Host: newsbf02.mail.aol.com I collect WE stuff. I am interested in buying nearly anything made by or for them. Please email me if you have anything to sell or trade. Thanks From lwbyppp@epix.net Fri Jan 26 13:49:37 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: michaelm@doruk.COM.TR (Michael C. McHugh (TA2ZG/W2AV)) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Yaesu FIF-232C information and/or help Date: 25 Jan 96 19:54:15 GMT Organization: ucsd usenet gateway Lines: 33 Message-ID: <9601251152.aa06172@bbs.doruk.com.tr> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Chester Mccarter wrote: >I have a Yeasu FT747GX and am trying to find a diagram of the FIF-232c >CAT cable. I'm sure that there is someone out there that has built a >similiar type cable. Please reply via e-mail also. Here is a circuit that we used at the local PRBBS for auto-QSY when we had an FT-747GX. Be warned: it is *crude*. It doesn't 'listen' to the radio and it has no provision to avoid sending a command if the radio is not 'ready'. OTOH it worked, I was able to build it into the DB25 computer connector, and it was dirt cheap. If your application is something like auto-QSY of a BBS for forwarding, give it a try. If you need a full- service CAT function, better stick with the FIF-232C or equivalent: 47 j 10 Kj |/ -----/\/\/\----- -------> FT-747GX >----/\/\/\------ --- ------| Si NPN | CAT input DB25-2 | | |\>-- ___ (+5v/680j) TXD ___ ___ | .01 ufd ___ Si ^ ___ .01 ufd ___ | | | /// | | | ___ ___ ___ /// /// /// The diode and transistor can be whatever you have in your junk box - not critical. Hope this helps - have fun and 73 - de Mike (TA2ZG/W2AV) Remote Sysop TA2EM BBS - first PRBBS in Turkiye Amateur Packet Radio: TA2ZG@TA2EM.#IST.TUR.EU Internet (email only): Michael C. McHugh From lwbyppp@epix.net Tue Jan 30 16:25:18 1996 Path: news.epix.net!uunet!in1.uu.net!istar.net!news1.ottawa.istar.net!fonorola!news.ottawa.istar.net!Rezonet.net!altitude!Stratus.CAM.ORG!not-for-mail From: jlyons@CAM.ORG (James Lyons) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space Subject: Re: ***ONE OF THE BEST HAM WEB PAGES ON THE INTERNET. TRY IT OUT!!*** Date: 22 Jan 1996 13:49:59 -0500 Organization: Communications Accessibles Montreal, Quebec Canada Lines: 24 Message-ID: <4e0m8n$gmh@stratus.CAM.ORG> References: <4dk7io$kd1@fnord.dfw.net> <4dlre7$mkr@superb.csc.ti.com> In-Reply-To: <4dlre7$mkr@superb.csc.ti.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Xref: news.epix.net rec.radio.amateur.misc:97408 rec.radio.amateur.antenna:18711 rec.radio.amateur.digital.misc:13825 rec.radio.amateur.equipment:24270 rec.radio.amateur.homebrew:13004 rec.radio.amateur.policy:32834 rec.radio.amateur.space:6217 On 18 Jan 1996, Ken Durham wrote: > In article <4dk7io$kd1@fnord.dfw.net>, dmclean@dfw.net says... > > > >Hello all: > > > > In the last message that I sent over usenet I forgot to include my > >url for my web site. The URL is "http://www.dfw.net/~dmclean". > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ` > I tried this URL yesterday and again this morning with no results. Netscsape > keeps contacting the host forever. Please try your page from another site an d > see if it can be accessed. > > Ken Durham K5MBV mbv@ti.com > > > I had no problem accessing it yesterday (Sunday) afternoon, twice ... once via Netscape and once via Lynx. Jim Lyons From lwbyppp@epix.net Tue Jan 30 16:25:19 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!sun!oucsboss!gw2.att.com!gw1.att.com!csn!ub!news.kei.com!newsfeed.internetmci.com!in1.uu.net!noc.nyx.net!nyx10.cs.du.edu!not-for-mail From: lekollar@nyx10.cs.du.edu (larry kollar) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Grapefruit powered XMTR? Date: 23 Jan 1996 13:52:49 -0700 Organization: University of Denver, Dept. of Math & Comp. Sci. Lines: 15 Message-ID: <4e3hr1$b5t@nyx10.cs.du.edu> References: <1996Jan16.194742.28225@llyene.jpl.nasa.gov> <4dj0qa$78a@ixnews5.ix.netcom.com> NNTP-Posting-Host: nyx10.nyx.net Thus spake Don Bayomi: >re: grapefruit powered Transmitter, Did Gilligans Island know about it? [...] >I don't recall if there was an episode on Gilligans Island where the >professor made a transmitter out of a fruit? I think you're remembering their transistor radio that was usually playing news reports... it was powered by a string of lemons. -- Larry Kollar, Dawsonville GA | *** Hatred is murder *** (1 Jn 3:15) lekollar@nyx.net | http://www.nyx.net/~lekollar/ "His third dimension done been re-VOKED!" From lwbyppp@epix.net Tue Jan 30 16:25:20 1996 Date: 23 Jan 1996 16:38:44 EDT Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!maggie.ionsys.com!newspeak.ultratech.net!worldlinx.com!clio.trends.ca!innuendo.tlug.org!telly!lethe!gts!feline!humnet.humberc.on.ca!hduff Newsgroups: rec.radio.amateur.homebrew From: hduff@humnet.humberc.on.ca (Hugh Duff) Message-ID: <8224331276601@lss.humnet.humberc.on.ca> Organization: HumberNet LSS, Humber College, Canada Subject: MCX100 PROM programming ? Lines: 24 I recently aquired a 16 channel Motorola MCX100 commercial VHF radio. Wondering if anyone has any info on programming a PROM for it ? This one has the "R2" VCO board...146 to 174 MHz. I see by the schematic that it uses 6 nibbles (4 bits wide) for the programming word. I also note that the PROM address is made up of the channel selector inputs AND a few bits from the phase comparator/ PLL chip. It appears that the Addressing from the phase detector/PLL gets clocked out and the data read back...6 times (for the 24 bit word). I'm wondering how the data relates to the desired frequencies and where the data should be placed (what addresses) ? Also wondering what the synthesizer step size is ? The easier solution to all this is to have someone program a PROM for me but thats too easy :) Curious....Hugh Duff VA3TO Toronto --- þ NFX v1.3 [000] From lwbyppp@epix.net Tue Jan 30 16:25:21 1996 Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!news.itsnet.com!a_wallace1.dtint.com!allen From: Allen Wallace Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST UHF Noise generator Date: 23 Jan 1996 16:48:32 GMT Organization: Digital Technology International Lines: 40 Distribution: world Message-ID: <4e33h0$rg4@itchy.itsnet.com> References: <199601202149.PAA26226@tri.net> NNTP-Posting-Host: gatekeeper0.wia.net X-UserAgent: Version 1.1.3 X-XXMessage-ID: X-XXDate: Tue, 23 Jan 96 16:21:42 GMT In article <199601202149.PAA26226@tri.net> Lawrence Stoskopf, stoskopf@tri.NET writes: >>I'm too cheap to buy a NoiseCom diode, and I!d like to try a 1N21 >>microwave diode instead. > >Come on. For all you have probably invested, what's a little bit more. And >besides, what other RF company can you call a probably have the company >owner answer the phone....he did for me twice. > * some stuff cut here * > >>The final use for the noise source is to amplify the noise with 6 or so >>MMIC amplifiers and use the noise with my spectrum analyzer to measure >>filter response, etc, up to 2 GHZ. The noise hopefully should be flat >>across the spectrum. > >How flat do you think that many MMICs will be? Yes. I know I'm cheap and ought to use the NoiseCom diode, however I haven't purchased one yet! I do have a few 1N21 diodes and I was wondering the how they compare. I figure I need to amplify a noise source of 20 ENR about 40-50 db to use this as a broad-band signal source to use in lue of a tracking generator for my spectrum analyzer. The Mini-Circuts MAR-4 (8 db gain) only drops 0.2 db from 100 Mhz to 1500 Mhz, and drops only another 0.3 do to 2000 Mhz. If I cascade 6 of these babies, I'll get about 50 db of gain, however any more and I'll exceep the 1db compression. This would give me a flat noise source with less than 2 db of dropoff. Maybe I'll try a MAV-11 MMIC as the final amplifer, as it has a 18 dbm max power, but it is not very flat. Has any one had any experience with this sort of thing? From lwbyppp@epix.net Tue Jan 30 16:25:22 1996 Path: news.epix.net!news.sprintlink.net!chewy.vcx.net!uunet!in2.uu.net!oronet!news From: rst-engr@oro.net (Jim Weir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: varator diodes Date: Tue, 23 Jan 1996 22:38:57 GMT Organization: RST Engineering Lines: 24 Message-ID: <4e3o2q$al0@hg.oro.net> References: <9601221149.AA09737@eagle.rtc-waterford.ie> <310453c0.7238895@news.duke.edu> NNTP-Posting-Host: rst-engr.oro.net X-Newsreader: Forte Free Agent 1.0.82 >>Does anyone have a source of varator diodes. > This may sound crazy, but measurements with a network analyzer show >that green LEDs make excellent, high Q, varactors. That's a great idea; I never even considered that possibility!! You wonder who thinks of this sort of thing, don't you? Has anybody done the same tests on the other colors? Any good RF transistor has a good varactor in the reverse-biased collector-base junction. If you want a low-power varactor, pick a low power transistor. High power, use a power RF device. Jim Jim Weir VP Engineering | You bet your sweet patootie I speak RST Engineering | for the company. I OWN the freakin' Grass Valley CA 95945 | company. voice/fax 916/272-1432 | AR Adv. WB6BHI Cessna 182A N73CQ rst-engr@oro.net | Comm'l Pilot & CFI Airplane/Glider A&P Mechanic From lwbyppp@epix.net Tue Jan 30 16:25:23 1996 Path: news.epix.net!news.sprintlink.net!news.dpc.net!news.heurikon.com!uwvax!uchinews!ncar!gatech!newsfeed.internetmci.com!news.kei.com!ub!dsinc!netnews.upenn.edu!blue.seas.upenn.edu!depolo From: depolo@blue.seas.upenn.edu (Jeff DePolo) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WANTED: 72 ohm twinlead Date: 24 Jan 1996 05:06:11 GMT Organization: University of Pennsylvania Lines: 54 Message-ID: <4e4eo3$1im@netnews.upenn.edu> NNTP-Posting-Host: blue.seas.upenn.edu Donald J. Miller wrote: > > Gary Stone (garystone@texoma.com) wrote: > > : My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead > : for a balun on an antenna project. I know very little of the project, > : but he does not have internet and I wanted to try and locate a source for > : him. > > You can't realize this transmission line with twinlead construction. > For an impedance that low, the diameter of the conductors is greater > than the spacing: > > s = center to center spacing > d = wire diameter > > Zo = 276 LOG(2s/d) This is not always true. 72 ohm transmitting line is a common item and is readily available from a number of sources. Either The Wireman, RF Connection, or Radio Works should have it. The above equation applies only directly to air-insulated parallel conductors. A non-air dielectric will lower the characteristic impedance, which is what yo u see with 72 ohm transmitting line, which uses something like 14 or 12 gauge wire close-spaced in solid dielectric. > You can still make a 72-ish ohm balanced transmission line, however, > if you use a different type of construction: > > Take four (4) sections of RG-59 (73 ohm coax) of equal length and > run them in parralell. Solder all the shields together on both > ends. Now, connect the center conductors together in pairs. > Cable A and B should have their center conductors connected > together on both ends, and cable C and D should have their > center conductors tied together. You now have a 73 ohm > shielded *balanced* transmission line. I will try to render it > in ascii: Probably easier to take four sections of 300 ohm twinlead and connect them in parallel. Just keep them safely separated. --- Jeff -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= - Jeff DePolo WN3A Twisted Pair: H:610-337-7383 W:215-387-3059 x30 0 depolo@eniac.seas.upenn.edu RF: 442.1 442.2 442.4 443.45 443.8 444.15 linked Claim to Fame: I got the first speeding ticket on the information superhighwa y -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= - Jeff DePolo WN3A Twisted Pair: H:610-337-7383 W:215-387-3059 x30 0 depolo@eniac.seas.upenn.edu RF: 442.1 442.2 442.4 443.45 443.8 444.15 linked Claim to Fame: I got the first speeding ticket on the information superhighwa y From lwbyppp@epix.net Tue Jan 30 16:25:25 1996 Path: news.epix.net!uunet!in1.uu.net!news.mailorder.com!news.avatar.com!avatar.avatar.com!kory From: Kory Hamzeh Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: Increasing the Power of the QST Antenna Tuner Date: Wed, 24 Jan 1996 19:32:39 -0800 Organization: Avatar Consultants, Inc. Lines: 28 Message-ID: References: <1996Jan14.184339.12423@ke4zv.atl.ga.us> NNTP-Posting-Host: avatar.avatar.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <1996Jan14.184339.12423@ke4zv.atl.ga.us> Xref: news.epix.net rec.radio.amateur.equipment:24183 rec.radio.amateur.homebrew:12971 On Sun, 14 Jan 1996, Gary Coffman wrote: > In article Kor y Hamzeh writes: > > > >I really liked the QST Antenna Tuner Project in the Jan 96 issue, but I > >need a tuner that can handle up to 600 watts. Can some kind soul explain > >to me what needs to be upgraded to handle 600 watts? > > The L network components, and the relays, need to be upgraded to handle > the higher power. The circuit board probably won't work either, traces > too thin and too close together, and the new parts probably won't fit > either. A new relay driver circuit will likely be needed too. You can > recalibrate the VSWR measuring circuit and use the custom microprocessor, > but everything else needs to be replaced. > > > Gary Hi Gary, The other problem I think I will defintly run into is all of the RF energy getting to the microprocessor. I'm not quite sure how to isolate it, other than shielding the microprocessor in a metal enclosure. Kory From lwbyppp@epix.net Tue Jan 30 16:25:26 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!gatech!swrinde!sdd.hp.com!hplabs!unix.sri.com!news.Stanford.EDU!w6yx.stanford.edu!stevem From: stevem@w6yx.stanford.edu (Steve Muther) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Toshiba S-AV17 amp module source Date: 24 Jan 1996 23:17:11 GMT Organization: Stanford Amateur Radio Club Lines: 18 Message-ID: <4e6eln$2pm@nntp.Stanford.EDU> References: <4e5qgn$c7c@panix.com> NNTP-Posting-Host: w6yx.stanford.edu Keywords: Amp module source Toshiba In article <4e5qgn$c7c@panix.com> ekv@panix.com (Elmar Vaher) writes: >Cant seem to find this module anywhere. Digi-Key or Mouser does not have >it. >This is for building the 2M brick in the 1996 Handbook. >Toshiba S-AV17 amp module. >Any help in getting a source as well as hints on building the brick would >be greatly appreciated. > > >-- > Elmar Vaher ********--------********** > ekv@panix.com Try RF PARTS. I think they are still advertising in QST. Steve Muther WF6R From lwbyppp@epix.net Tue Jan 30 16:25:26 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!psinntp!psinntp!psinntp!news1.h1.usa.pipeline.com!usenet From: kb7et@usa.pipeline.com(Jim Sheffield) Newsgroups: rec.radio.amateur.homebrew Subject: Opinions - Ramsey SX-20 Date: 24 Jan 1996 23:36:28 GMT Organization: Jim Sheffield Lines: 10 Message-ID: <4e6fps$2d8@news1.usa.pipeline.com> NNTP-Posting-Host: pipe10.h1.usa.pipeline.com X-Newsreader: Pipeline USA v3.2.0 I am contemplating diving into the kit-building experience with the Ramsey SX-20 20-meter SSB/CW transceiver. Anyone built and/or operated this rig? I am especially interested in the CW performance. Opinions welcome by posting or e-mail. Thanks and 73, Jim, KB7ET kb7et@usa.pipeline.com From lwbyppp@epix.net Tue Jan 30 16:25:27 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!news.gate.net!bcfreenet.seflin.lib.fl.us!dcfreenet!d018667c From: d018667c@dcfreenet.seflin.lib.fl.us (Ricardo Buch) Newsgroups: rec.radio.amateur.homebrew Subject: Cuban-German Geneological Club Date: 25 Jan 1996 00:14:51 GMT Organization: SEFLIN Free-Net - Dade Lines: 10 Message-ID: <4e6i1r$r8f@bcfreenet.seflin.lib.fl.us> NNTP-Posting-Host: dcfreenet.seflin.lib.fl.us X-Newsreader: TIN [version 1.2 PL2] Old school Pc 4 sale; I got an commodore 64 pc w/2 drives modem and printer. Was great for Packet. Locals only. thanks :> -- Ricardo Buch d018667c@dcfreenet.seflin.lib.fl.us From lwbyppp@epix.net Tue Jan 30 16:25:28 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!EU.net!Belgium.EU.net!ping.be!news From: Geert.Pirens@ping.be (Geert Pirens) Newsgroups: rec.radio.amateur.homebrew Subject: WANTED schematic of a IF-100 interface! Date: Thu, 25 Jan 1996 00:55:46 GMT Organization: PING Belgium Lines: 9 Message-ID: <4e6kcl$qp0@ping1.ping.be> NNTP-Posting-Host: dialup37.hasselt.eunet.be X-Newsreader: Forte Free Agent 1.0.82 Can someone help me on a schematic of an IF-100 interface ? All information is welkom ! Geert Pirens,ONL2057 From lwbyppp@epix.net Tue Jan 30 16:25:29 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.sprintlink.net!cc.iu.net!news From: blombard@iu.net (Bob Lombardi) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VCO power supply noise reduction Date: 25 Jan 1996 01:57:59 GMT Organization: Organized? I can't even find my car keys Lines: 57 Message-ID: <4e6o37$e3b@cc.iu.net> References: <4ch6gf$56k@abyss.West.Sun.COM> <1996Jan10.161901.20012@ke4zv.atl.ga.us> <1996Jan12.180329.81@ke4zv.atl.ga.us> <4d7ogd$t51@news.azstarnet.com> <30FBE7D3.69B5@arrl.org> NNTP-Posting-Host: netport-45.iu.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 In article , n7ws@azstarnet.com says... > snip out third party.... > >My fears involve long term effects such as problems with moisture and plastic >packaged ICs. This isn't exactly my area of expertise, however, in my >department, we have materials people, chemists, and other components engineer s >that share my concern. I realize that some environments, particularly >automotive, have conditions that may be worse than mil spec requirements. >However, if you store your car for ten years in a bunker then ship it to Saud i >Arabia and store it for a while at 140 degrees F and then ship it to Alaska >and store it there for a while then take it out and try to start it with >the first turn of the key, what happens? You probably will have six sigma >(latest buzz word) repeatability; it fails 999,997 times out of 1,000,000. Automotive is bad, but offshore oil rigs may be the worst, according to something I read. > >On a not too related subject, but one brought on by a not to well thought out >edict: > >We have also been forced to eliminate the use of oxygen-depleting-chemicals >(ODCs), such as the defluxing agents used to remove rosin flux. So, we use >acid fluxes and water-based solvents. Of course, we are using surface mount >components too. What are the long tern effects of less than perfect removal o f >the flux trapped under the components in moist environments. Your guess is as >good as mine. But this is progress :-) Personally, I think the obsession with removing rosin flux is cosmetic. My only measurement experience with this is from over 15 years ago when I was sti ll a technician. Used to work for a place that made very precise measurement equipment for computer control of all sorts of industrial stuff (everything from making chocolate at Hershey's to reclaiming silver at Kodak). The most sophisticated amplifier card we had, with a gain of 2048 in a system that read down to microvolts per bit, was sensitive to contamination. Skin oils would drive readings off, invalidate input bias current measurements, and other thin gs. Rosin flux was essentially inert. I saw cards come back from the field with flux on them for years and it was never a problem. I would guess that an activated flux might be a problem, but I've never seen studies on it, or had experience with it. > >>Airbag. n. 1) An automotive accessory designed to explode on impact. > >ALL of our products are designed to explode on impact. Too bad. Unless you make stuff for the construction/excavation industry. -- Bob Lombardi WB4EHS in Melbourne, FL o \---\---\ blombard@iu.net or blombard@freenet.fsu.edu /\ | Telescope making, optics, astronomy, piano, bicycling -\ 7 & radio | I've run out of things I can say in 4 lines. (*)/(*) | From lwbyppp@epix.net Tue Jan 30 16:25:31 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!nntp-hub2.barrnet.net!news.Stanford.EDU!chemeng.Stanford.EDU!mike From: mike@chemeng.Stanford.EDU (Mike Mackaplow) Newsgroups: sci.electronics.equipment,sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave Subject: I found some old vacuum tubes ... Date: 25 Jan 1996 04:48:55 GMT Organization: Department of Chemical Engineering, Stanford University Lines: 25 Distribution: inet Message-ID: <4e723n$8i2@nntp.Stanford.EDU> NNTP-Posting-Host: chemeng.stanford.edu Keywords: vacuum tubes Xref: news.epix.net sci.electronics.equipment:908 sci.electronics.components:1626 rec.radio.amateur.homebrew:12980 rec.radio.shortwave:69348 While helping clear my mom's garage, I found some vacuum tubes: Magnavox 12BA6 Magnavox 12BE6 Magnavox 12AV6 RCA Electron Tube 35C5 Sentinel 12BE6 TEN 12BE6 General Electric MA? ?? 12BA6 ?? 12AV6 ?? 35 W4 (2) Is there a simple way to tell if the tubes are good ? How would I find out if they have any value ? How would one go about or, more likely, donating them ? Thanks, Mike Mackaplow mike@chemeng.stanford.edu P.S. - I am in the southern San Francisco Bay area From lwbyppp@epix.net Tue Jan 30 16:25:32 1996 Path: news.epix.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm.tmc.edu!newsfeed.rice.edu!news.sesqui.net!compassnet.com!usenet From: Spencer Petri Newsgroups: rec.radio.amateur.homebrew Subject: FS: HV P..S. Diodes. Date: 25 Jan 1996 06:13:32 GMT Organization: Compass Net, Inc. Lines: 6 Message-ID: <4e772c$1nl@saratoga.compassnet.com> NNTP-Posting-Host: dial42.e-tex.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) These diodes are great for that big amp supply. 20KV and I did a test at 1.2 Amps for 6 hours, these babies can take it. $10 each or build a bridge at 4 for $35 and $3 for priority mail. 73 de Pete WA5JCI EM-21 From lwbyppp@epix.net Tue Jan 30 16:25:33 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!news.rhrz.uni-bonn.de!RRZ.Uni-Koeln.DE!wmwap1.math.uni-wuppertal.de!usenet From: Robert Schneider Newsgroups: rec.radio.amateur.homebrew Subject: Re: Lowfer help. Date: Thu, 25 Jan 1996 12:25:04 +0100 Organization: University of Wuppertal Lines: 4 Message-ID: <31076890.167E@rz.uni-wuppertal.de> References: <3102FE76.94B@UTM.Edu> NNTP-Posting-Host: wrds15.urz.uni-wuppertal.de Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b3 (X11; I; OSF1 V3.2 alpha) Try ftp://ftp.uni-wuppertal.de/pub/lowfer -- Robert Schneider 0202/4392244 schneide@wrds1.urz.uni-wuppertal.de From lwbyppp@epix.net Tue Jan 30 16:25:33 1996 Path: news.epix.net!uunet!in1.uu.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet From: QRP%mimi@magic.itg.ti.com (D W Hemphill KC5NG) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need 10 meter conversion info for Cobra 148gtl Date: 25 Jan 1996 13:22:51 GMT Lines: 11 Message-ID: <4e807b$mou@mksrv1.dseg.ti.com> References: <4djt6j$32v$3@mhafn.production.compuserve.com> <4dkf20$dju@cloner3.netcom.com> <4doufc$okg@mksrv1.dseg.ti.com> NNTP-Posting-Host: dhemphill.dseg.ti.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 > >i've seen the "kits," its $50 for a crystal. > >jeff Like I said earlier, his prices are astronomical! You can buy a crystal from JAN Crystals for $10, do the conversion yourself, and save big buxx! 73 de KC5NG From lwbyppp@epix.net Tue Jan 30 16:25:34 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!usenet From: louburke@indirect.com Newsgroups: rec.radio.amateur.homebrew Subject: *** CHECK OUT WHIZBANGS & GIZMOS *** Date: 25 Jan 1996 13:42:39 GMT Organization: Internet Direct, Inc. Lines: 10 Message-ID: <4e81cf$bjh@globe.indirect.com> NNTP-Posting-Host: s20.phxslip4.indirect.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) Check our NEW Homepage at http://www.versacom.com/www/louburke We sell circuits, PC Boards, Kits and Finished Products. Currently available are: Touchtone Decoder Audio Power Amp (10 watts) Electronic Thermometer with Alarm Circuit Audio Distribution Amp From lwbyppp@epix.net Tue Jan 30 16:25:35 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!overload.lbl.gov!news.emf.net!gatech!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WANTED: 72 ohm twinlead Date: 25 Jan 1996 19:22:12 GMT Organization: ELNEC/EZNEC Software Lines: 36 Message-ID: <4e8l94$ib3@maureen.teleport.com> References: <4e377j$ie1@crl.crl.com> NNTP-Posting-Host: ip-pdx14-14.teleport.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) ; dmiller@crl.com (Donald J. Miller) writes: ; Gary Stone (garystone@texoma.com) wrote: ; : My brother-n-law (KI7XQ) is looking for about 3 feet of 72 ohm twinlead ; : for a balun on an antenna project. I know very little of the project, ; : but he does not have internet and I wanted to try and locate a source for ; : him. ; You can't realize this transmission line with twinlead construction. ; For an impedance that low, the diameter of the conductors is greater ; than the spacing: ; s = center to center spacing ; d = wire diameter ; Zo = 276 LOG(2s/d) The formula you quote is an approximation, which falls apart with close spacing/large conductors, as you found. The correct formula is Zo = 120 cosh^-1 (s/d) where cosh^-1 is arc hyperbolic cosine. This is for air dielectric. The presence of other material between the conductors will lower the impedance. 72 ohm twinlead used to be common stuff, in two sizes, "receiving" and "transmitting". I've got a bit of the transmitting stuff in my junk box, but it's too large and stiff for practical use in a balun. In this day and age, I'd use twisted pair with thinnish insulation. Unless it's being used at a frequency where 3 feet is an appreciable fraction of a wavelength, the Zo of the line probably won't be very important. Roy Lewallen, W7EL From lwbyppp@epix.net Tue Jan 30 16:25:36 1996 Date: 25 Jan 1996 21:37:06 EDT Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!istar.net!infoshare!whome!gts!feline!humnet.humberc.on.ca!hduff Newsgroups: rec.radio.amateur.homebrew From: hduff@humnet.humberc.on.ca (Hugh Duff) Message-ID: <8226238295302@lss.humnet.humberc.on.ca> Organization: HumberNet LSS, Humber College, Canada References: <4e5qgn$c7c@panix.com> Subject: Re: Need Toshiba S-AV17 amp module source Lines: 20 > Cant seem to find this module anywhere. Digi-Key or Mouser does not have > it. > This is for building the 2M brick in the 1996 Handbook. > Toshiba S-AV17 amp module. > Any help in getting a source as well as hints on building the brick would > be greatly appreciated. > -- > Elmar Vaher ********--------********** > ekv@panix.com RF Parts in California sells these modules. Look em up in a recent 73, CQ or QST ad. Hugh Duff VA3TO Toronto --- þ NFX v1.3 [000] From lwbyppp@epix.net Tue Jan 30 16:25:38 1996 Date: 25 Jan 1996 21:37:14 EDT Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!hookup!noc.tor.hookup.net!ve3ied!gts!feline!humnet.humberc.on.ca!hduff Newsgroups: rec.radio.amateur.homebrew From: hduff@humnet.humberc.on.ca (Hugh Duff) Message-ID: <8226238376603@lss.humnet.humberc.on.ca> Organization: HumberNet LSS, Humber College, Canada References: <4e02li$bov@news.aros.net> Subject: Re: QST Antenna Tuner Kit-First Impressions Lines: 60 > In article <4csf5c$b0o@newsbf02.news.aol.com>, w8jitom@aol.com says... > > > >In article <1996Jan6.185503.8669@ohstpy>, > >garland@ohstpy.mps.ohio-state.edu (JIM GARLAND) writes: > > > >>My only quibble with the kit is the printed circuit board. The board > >>itself is of high quality. It is double-sided, with thru-plated holes, > >>green solder-masking, and silk-screened component outlines shown in > >>white. My concern about the board is that the large majority of the > >>traces seem to be extremely thin. I couldn't measure them, but I'd > >>guess a maximum width of 10 mil, and probably less, perhaps even > >>6-7 mil. (all the relay control lines are wired this way.) Further, > >>the pad sizes seem too small relative to the holes in the pad. I'm not > >>an expert at PCB layout, but I'd think that a pad should have a minimum > >>of 10-15mil of metal around each hole. > >>The majority of holes on the board have significantly less metal than > >this. In fact, a majority of the holes were drilled slightly off-center > >>in the pads, so that there is no metal at all on one side of the hole! > >> > > > >Hi Jim, This sounds like the boards I get from out of house layout shops > >that never work with RF. That's too bad. Maybe you could point that out to > >the kit supplier, because your observations illustrate a big problem. > >Somewhere I heard the rhyme short and thick does the trick. I assume that > >meant RF traces. > > > >73 Tom > > I hope I am happy when mine arrives. As for the short and thick, that depend s > on the signal in RF. Some microwave circuits depend on "controlled" length a n > thickness, though better called width here, since thick is the depth of the > copper clad. In my designs (I design electronics for a few paying customers) , > width is important in power supply to reduce I-R losses, as well as some key > analog traces. > > I will post as soon as I finish building my tuner to let others know what I > think of it. > > Douglas L. Datwyler WR7O > datwyler@aros.net > The mentioned "thin" traces on the board are for logic control and not RF (a typical width for digital circuitry). The RF lines, you will note are much thicker. My concern was that a groundplane was not utilized, instead...the unused copper was etched away. I would have kept the copper on any unused areas on either side of the board with lots of plated thru holes to help shield the digital control lines from the RF. Regards...Hugh Duff VA3TO Toronto --- þ NFX v1.3 [000] From lwbyppp@epix.net Tue Jan 30 16:25:39 1996 Date: 25 Jan 1996 21:37:22 EDT Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!istar.net!infoshare!whome!gts!feline!humnet.humberc.on.ca!hduff Newsgroups: rec.radio.amateur.homebrew From: hduff@humnet.humberc.on.ca (Hugh Duff) Message-ID: <8226238456204@lss.humnet.humberc.on.ca> Organization: HumberNet LSS, Humber College, Canada References: <4dvntf$mqi@info4.rus.uni-stuttgart.de> Subject: Re: Toroid permeability ??? Lines: 25 > >....but some surplus stores in Toronto have a wide > >assortment of bins of unmarked toroids. It would be a nice > >cost-effective altenative to having to order new ones if we knew what we > >had sitting at our doorstep. > > May be I am wrong, But I expect that 99% of surplus toroids > are intended for frequencies below 1 MHz (switch mode PSU's?) > > 73, Moritz DL5UH > I suspect that most of them are ferrite cores for noise suppression use however there are several bins at the surplus store with wound cores that look more like RF transformers. Nevertheless, I get the feeling that it is not worth the effort to try and salvage a small assortment of RF capable iron cores. Just a passing thought though ! Regards... Hugh Duff VA3TO Toronto --- þ NFX v1.3 [000] From lwbyppp@epix.net Tue Jan 30 16:25:40 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!lynx.unm.edu!bubba.NMSU.Edu!not-for-mail From: beard@acca.nmsu.edu (beard) Newsgroups: rec.radio.amateur.homebrew Subject: Need Antenna Design Program Date: 25 Jan 1996 22:10:23 GMT Organization: New Mexico State University Lines: 10 Message-ID: <4e8v4f$jhn@bubba.NMSU.Edu> NNTP-Posting-Host: acca.nmsu.edu X-Newsreader: TIN [UNIX 1.3 950621BETA PL0] I know of one antenna modeling program called "YagiMatch" Are there others out here? If there are how to I get the freeware or shareware versions? Thanks for any help you can give me. WA4QGA David Beard El Paso, Texas From lwbyppp@epix.net Tue Jan 30 16:25:41 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!hookup!tank.news.pipex.net!pipex!oleane!jussieu.fr!math.ohio-state.edu!uwm.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!news.join.ad.jp!wnoc-tyo-news!sinfony-news!sonygw2!oskgw!news From: Peter Shintani Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: 26 Jan 1996 05:48:37 GMT Organization: Sony Japan Lines: 10 Message-ID: <4e9pvl$si0@oskgw.osk.sony.co.jp> References: <4d5d0k$8vm@newsbf02.news.aol.com> <4d7lvt$cea@newsbf02.news.aol.com> <1996Jan13.104606.4572@ke4zv.atl.ga.us> NNTP-Posting-Host: 43.2.3.17 Mime-Version: 1.0 Content-Type: text/plain; charset=iso-2022-jp Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-URL: news:1996Jan13.104606.4572@ke4zv.atl.ga.us Hi: A company called Mitsubishi Material makes an awesome surge protector. It's fast and once it's clamping voltage is exceede it's holding voltage drops to nearly zero. This may provide better protection than a MOV for a radio's input and also for phone lines, and modems. The device incidenta lly has less than 1 pF of capacitance so it's easier to use than a MOV. It can tak e repeated hits and it's characteristics stay constant were as MOV can deteriora te. PS From lwbyppp@epix.net Tue Jan 30 16:25:42 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!ns1.aplatform.com!pagesat.net!netserv.com!aimnet.com!news.ossi.com!agate!howland.reston.ans.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!airwaves!rrb From: stobty@pacifier.com (Ty Stober) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.broadcasting,rec.radio.cb,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap Subject: Larsen Antennas Job Posting Followup-To: poster Date: 26 Jan 1996 07:35:11 GMT Organization: Pacifier Internet Server (360) 693-0325 Lines: 38 Approved: rrb@airwaves.chi.il.us Distribution: world Message-ID: <4ea07f$9a7@vixen.cso.uiuc.edu> Reply-To: stobty@pacifier.com NNTP-Posting-Host: clm.aiss.uiuc.edu Originator: rrb@clm.aiss.uiuc.edu Xref: news.epix.net rec.radio.amateur.antenna:18725 rec.radio.amateur.digital.misc:13837 rec.radio.amateur.equipment:24298 rec.radio.amateur.homebrew:13018 rec.radio.amateur.misc:97443 rec.radio.amateur.policy:32853 rec.radio.amateur.space:6220 rec.radio.broadcasting:20257 rec.radio.cb:25972 rec.radio.noncomm:5126 rec.radio.scanner:44621 rec.radio.shortwave:69433 rec.radio.swap:56275 MARKET MANAGER - ANTENNA PRODUCTS Larsen Electronics is an internationally recognized supplier of quality antenna products for two-way communications. We are seeking an experienced Market/Product Manager for Amateur and Commercial antennas. Successful candidates will have in-depth experience in radio related products up to 800 MHz. Direct experience with LMR and Amateur markets is preferred. Bachelor92s degree in Business or Marketing, or extensive related business experience required. Position responsibilities include: Product line management, pricing, sales programs, new products, training, and technical support. This position will also include a competitive compensation, incentive, and benefits plan. Interested candidates may respond by forwarding a resume92 including income history to: Larsen Electronics, Inc. ATT: Human Resources Manager P.O. Box 1799 Vancouver, WA. 98668-1799 FAX: 1-360-944-7556 Pre-employment drug screen required. Larsen Electronics is an Equal Opportunity Employer. -- ------------------------------------------------------------------------- - ---- Pacifier Online Data Service Dialup SLIP/PPP User To register: (360) 693-0325 or telnet pods.pacifier.com ------------------------------------------------------------------------- - ---- From lwbyppp@epix.net Tue Jan 30 16:25:44 1996 Path: news.epix.net!news.sprintlink.net!news.netrail.net!imci2!news.internetMCI.com!darwin.sura.net!babylon5.ccd.harris.com!not-for-email From: dsnowden@ccd.harris.com (Doug Snowden) Newsgroups: rec.radio.amateur.homebrew Subject: Swan XTAL Filter Impedance ? Date: 26 Jan 1996 08:44:34 -0500 Organization: Harris Controls Division Lines: 10 Message-ID: <4eals2$b51g@rs2.ccd.harris.com> NNTP-Posting-Host: rs2.ccd.harris.com X-Newsreader: TIN [version 1.2 PL2] I found an old Swan xtal filter the other day. I'd like to play around with it in a receiver circuit. It is a 487-024 freq = 9001.65 khz. I think I came from an old Swan Astro 100 transceiver. What is the in/out impedance ? Guess I could play until I got it matched if all else fails. Doug, N4IJ -- Doug Snowden dsnowden@ccd.harris.com From lwbyppp@epix.net Tue Jan 30 16:25:45 1996 Path: news.epix.net!news.sprintlink.net!chewy.vcx.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: davide70@aol.com (DavidE70) Newsgroups: rec.radio.amateur.homebrew Subject: Kit HF receivers Date: 26 Jan 1996 13:54:47 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 7 Sender: root@newsbf02.news.aol.com Message-ID: <4eb81n$a7l@newsbf02.news.aol.com> Reply-To: davide70@aol.com (DavidE70) NNTP-Posting-Host: newsbf02.mail.aol.com Do any manufacturers still make "low-tech" SW receivers or kits? I've seen one that MFJ sells (a regenerative set) -- does anyone know if it actually works? It claims CW and SSB as well as AM. Should I believe that? If it performs up to its claims it would be perfect for my purposes. Any suggestions for me? Thanks. Dave Ek From lwbyppp@epix.net Tue Jan 30 16:25:46 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!reeve.research.aa.wl.com!decwrl!sunsite.doc.ic.ac.uk!demon!ifwtech.demon.co.uk!G3SEK From: "Ian White, G3SEK" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Balum Loss Question Date: Fri, 26 Jan 1996 14:03:58 +0000 Organization: IFW Technical Services Lines: 30 Distribution: world Message-ID: References: <4e98au$1dv6@news.gate.net> NNTP-Posting-Host: ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL> In article <4e98au$1dv6@news.gate.net>, Larry Lewis wrote: >What is the loss (in db) of a 4:1 coax (assume 9913) balum at 144 mhz? >or >Where can I find the data (didn't see it in 1993 ARRL Handbook nor the >RSGB VHF/UHF handbook)? >or >How to calculate the loss. >or >What is your guess? My guess is 0.2db??? > 0.2dB is commonly used in EME and other path loss budgets for a balun made of low-loss cable. As well as dissipative losses in the half-wavelength of cable, this figure is usually taken to include losses due to phase errors and radiation losses in connecting to the folded dipole. In other words it is not directly measurable by methods such as connecting two identical baluns back-to-back. I guess it's really just a "wet-finger" allowance that people make when converting from computed gain to real-world gain. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From lwbyppp@epix.net Tue Jan 30 16:25:46 1996 Path: news.epix.net!news.sprintlink.net!usit.net!news From: sfritts@usit.net (Steven Fritts) Newsgroups: rec.radio.amateur.homebrew Subject: Need info on RG 62 Date: Fri, 26 Jan 1996 14:31:24 GMT Organization: United States Internet, Inc. Lines: 8 Message-ID: <4eaopo$of1@news.usit.net> Reply-To: sfritts@usit.net NNTP-Posting-Host: bway-slip71.dynamic.usit.net X-Newsreader: Forte Free Agent 1.0.82 Could someone tell me what the impedence of RG62 is? Thanks, Steve From lwbyppp@epix.net Tue Jan 30 16:25:47 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!msunews!netnews.upenn.edu!dsinc!ub!news.kei.com!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail From: jyazel@freenet.columbus.oh.us (Jack Yazel) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need info on RG 62 Date: 26 Jan 1996 14:40:12 -0500 Organization: The Greater Columbus FreeNet Lines: 12 Message-ID: <4ebams$ble@acme.freenet.columbus.oh.us> References: <4eaopo$of1@news.usit.net> NNTP-Posting-Host: acme.freenet.columbus.oh.us X-Newsreader: TIN [version 1.2 PL2] Steven Fritts (sfritts@usit.net) wrote: : Could someone tell me what the impedence of RG62 is? : Thanks, : Steve 93 ohms From lwbyppp@epix.net Tue Jan 30 16:25:48 1996 Newsgroups: sci.electronics.components,sci.electronics.equipment,rec.radio.amateur.homebrew,rec.radio.shortwave Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!hookup!news.mathworks.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!news.bhp.com.au!mel.dit.csiro.au!actcsiro!news.nsw.CSIRO.AU!seurat.syd.dit.csiro.au!not-for-mail From: ken@syd.dit.CSIRO.AU (Ken Yap) Subject: Re: I found some old vacuum tubes ... X-Nntp-Posting-Host: seurat.syd.dit.csiro.au Message-ID: <4eapgiINNq5o@seurat.syd.dit.csiro.au> X-Face: bak'McMAD{%JrA$mQ(j_Ex_o?a/F8/Ntng*t2KX(NcfGalVs^Ke^C61:F Sender: ken@syd.dit.csiro.au (Ken Yap) Reply-To: ken@syd.dit.csiro.au (Ken Yap) Organization: CSIRO Division of Information Technology References: <4e723n$8i2@nntp.stanford.edu> Distribution: inet Date: Fri, 26 Jan 1996 14:46:42 GMT Lines: 29 Xref: news.epix.net sci.electronics.components:1578 sci.electronics.equipment:886 rec.radio.amateur.homebrew:12946 rec.radio.shortwave:69290 |While helping clear my mom's garage, I found some |vacuum tubes: | | Magnavox 12BA6 | Magnavox 12BE6 | Magnavox 12AV6 | RCA Electron Tube 35C5 | Sentinel 12BE6 | TEN 12BE6 | General Electric MA? | ?? 12BA6 | ?? 12AV6 | ?? 35 W4 (2) | |Is there a simple way to tell if the tubes are good ? How |would I find out if they have any value ? How would one go about |or, more likely, donating them ? Hah, you probably have some tubes from those AC/DC line transformerless radios. The 35C5 is a power pentode or tetrode. The 35W4 is a rectifier. The 12BE6 is a converter. The 12AV6 is a dual triode. If I remember correctly the filament current is 0.15A. They were usually wired in series to make up 100-120V worth of voltage drop which is just right for US power standard. Just give them to a tube enthusiast. He/she will know what to do with them. Bothers me that I actually can remember this stuff. :-) From lwbyppp@epix.net Tue Jan 30 16:25:50 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news1!ind-008-237-85 From: mai@iquest.net (Patrick Croft) Subject: Re: RG63/B COAX - OHMS=? X-Nntp-Posting-Host: ind-008-237-85.iquest.net Message-ID: Sender: news@iquest.net (News Admin) Organization: IQuest Network Services X-Newsreader: News Xpress Version 1.0 Beta #2.1 References: <310834C9.60C1@jaxnet.com> Date: Fri, 26 Jan 1996 16:11:39 GMT Lines: 17 "John R. Moore" wrote: >Patrick Croft wrote: >> >> Seeking a little help on tech spec's of this stuff. Have checked all handb ooks, >> major manufacturer's catalogs back thru the 60's, can't find it! This is TIMES brand, >> but not in their catalog either. If you can shed some light I'd really app reciate it! >> >> 73 >> Patrick WB9IQIPatrick >according to my book RG-63B impedance is 125 ohms Capacitance is >10 pf/ft 6.4 db loss per 100 ft at 1000 mhz. >John W5HUQ Thanks to all for the info - many responded. Very informed group we have here ! 73 PAtrick WB9IQI From lwbyppp@epix.net Tue Jan 30 16:25:51 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: NiCAD Charger Schematic? Date: 26 Jan 1996 17:04:34 GMT Organization: Dover Research Corp. Lines: 5 Message-ID: <4eb1j2$sa7$3@mhafn.production.compuserve.com> There is also a schematic and PCB of WB0VGEs Nicad charger in CIRCAD format. If you have Compuserve access GO HAMNET. I think it is in lib 6 (or else 22) the Homebrew area. -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Tue Jan 30 16:25:52 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!news.larc.nasa.gov!lerc.nasa.gov!purdue!news.bu.edu!buphy.bu.edu!eburton From: eburton@buphy.bu.edu (Erich Burton) Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: Adding lighting to Red Lion Controls counter modules Date: 26 Jan 1996 18:41:51 GMT Organization: Boston University Physics Department Lines: 18 Message-ID: <4eb79f$efi@news.bu.edu> References: NNTP-Posting-Host: buphy.bu.edu Xref: news.epix.net sci.electronics.components:1590 rec.radio.amateur.homebrew:12954 faunt@netcom2.netcom.com (Doug Faunt N6TQS +1-510-655-8604) writes: :Does anyone have an address or other contact information for Red Lion :Controls? From the '95 eem guide: Red Lion Controls 20 Willow Springs Cir. York, PA 17402 Tel: 717-767-6511 Fax: 717-764-0839 Hope this helps. ____________________________________ Erich Burton 3-2602 eburton@bu.edu Boston University Physics Department From lwbyppp@epix.net Tue Jan 30 16:25:53 1996 Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!news.paonline.com!usenet From: buddy.sohl@shivasys.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Reselling the home brew equipment Date: Fri, 26 Jan 1996 20:54:42 GMT Organization: Pennsylvania Online [Usenet News Server for Hire] Lines: 30 Message-ID: <4ebek8$sas@news.paonline.com> References: <4cf5k1$4dd@service-2.agate.net> NNTP-Posting-Host: sl03.shivasys.com X-Newsreader: Forte Free Agent 1.0.82 John Wilcox/NS1Z wrote: >Was talking with my buddy this evening on the subject of buying and >selling home brew gear. It was my opinion that home brew gear took such a >beating at the sales table/tailgate due to the fact that most hams >believe that no other ham has any construction skills and therefore, any >equipment built by Mr. No Skill is worthless, except for the parts (which >may or may not be any good!). Is this the way it is in your area of the >world? What would make a piece of HB gear more valuable to the astute >buyer? Hi John....the very best way for homebrew gear to attain value, is 1. quality construction, 2. quality outward appearance, 3. documentation, 4. good salesmanship. As far as the average ham not being competent to build...that can be debated. Many hams are all thumbs, many are competent kit builders, lots are great from scratch but the final product looks awful (works great though). Then there is that few that can take a box of junk, build the best looking, functional and loaded with bells and whistles piece of equipment. So if you want a good piece of homebrew equipment, learn the principles behind the box, and either build it yourself or look deep into the construction of your potential purchase. 73 de KC4WQ BTW my stuff works but looks like @#$% From lwbyppp@epix.net Tue Jan 30 16:25:54 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.connectnet.com!usenet From: David Negaard Newsgroups: rec.radio.amateur.homebrew Subject: Looking for plans for transceiver for packet Date: Fri, 26 Jan 1996 21:17:34 -0800 Organization: Connectnet Lines: 14 Message-ID: <3109B56E.3A080BB4@connectnet.com> NNTP-Posting-Host: forge.connectnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (X11; I; Linux 1.3.22 i586) I'm looking for plans for a simple (probably crystal-controlled) transceiver that would be suitable for 9600 bps packet use. Does anyone know where I might obtain same? My hand-held won't cut it, of course (PM instead of true FM), and I can't really afford to buy another radio right now. Also, I assume that a radio suitable for 9600 bps would also function admirably at 1200? -- San Diego District Youth Leader David Negaard phone: (619) 761-0280 625 Shenandoah Avenue mailto:draagen@connectnet.com San Marcos, CA 92069 http://www3.graceland.edu/~jrmj/negaard From lwbyppp@epix.net Tue Jan 30 16:25:55 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!visi.com!news3.mr.net!mr.net!imci2!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: rmmiller@ix.netcom.com(Robert M. Miller ) Newsgroups: rec.radio.amateur.homebrew Subject: Re: League publishes yet another mpu article sans software Date: 26 Jan 1996 21:29:07 GMT Organization: Netcom Lines: 14 Message-ID: <4ebh33$1uj@ixnews6.ix.netcom.com> NNTP-Posting-Host: sac-ca8-13.ix.netcom.com X-NETCOM-Date: Fri Jan 26 1:29:07 PM PST 1996 Well unless my eyes have failed me, my December QEX just arrived complete with a feature article on a mpu based receiver controller that is cute and usable, but like the antenna tuner article this article does not offer any vehicle to obtain source code--but the author's company is willing to sell a kit; a kit which looks to be reasonably price, but a commercial product none the less. This again brings up the question of article vs. review. Perhaps a few letters to our elected Division Directors would bring this to the attention of League officials-- 73 Bob, KE6F From lwbyppp@epix.net Tue Jan 30 16:25:56 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr6ip5.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: aus.electronics,aus.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.components Subject: Re: Need VCO, 1-2 gHz - circuit or off-shelf Date: Fri, 26 Jan 1996 21:36:14 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 28 Message-ID: References: <4ebi51$qa8@oznet11.ozemail.com.au> NNTP-Posting-Host: usr6ip5.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] Xref: news.epix.net aus.electronics:1625 aus.radio.amateur.misc:399 rec.radio.amateur.homebrew:12942 sci.electronics.components:1576 In article <4ebi51$qa8@oznet11.ozemail.com.au> sjandrew@ozemail.com.au (Steve Andrew) writes: >From: sjandrew@ozemail.com.au (Steve Andrew) >Subject: Need VCO, 1-2 gHz - circuit or off-shelf >Date: Fri, 26 Jan 1996 21:42:58 GMT >Hi >I'm trying to obtain a VCO covering 1 - 2 gHz for use in a >spectrum analyser project. I know Minicircuits (USA) >manufacture a range of VCO modules but I am told that they >are un-available in Australia due to future production being >sold out. I doubt they're sold out, but my catalog shows their highest frequency model to be the POS-1025 which tunes from ~615 to 1050 MHz. >If you know of an outlet for these units, or any other >types, or have a proven circuit, please let me know. There are other USA vendors, such as HP/Avantek and VariL, however, if you only want one or two pieces, forget them. >Many thanks in advance... Steve Wes -- N7WS From lwbyppp@epix.net Tue Jan 30 16:25:57 1996 Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.asu.edu!news.eas.asu.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!harbinger.cc.monash.edu.au!news.mel.aone.net.au!OzEmail!usenet From: sjandrew@ozemail.com.au (Steve Andrew) Newsgroups: aus.electronics,aus.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.components Subject: Need VCO, 1-2 gHz - circuit or off-shelf Date: Fri, 26 Jan 1996 21:42:58 GMT Organization: OzEmail Pty Ltd - Australia Lines: 14 Message-ID: <4ebi51$qa8@oznet11.ozemail.com.au> Reply-To: sjandrew@ozemail.com.au NNTP-Posting-Host: slgol1p14.ozemail.com.au X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net aus.electronics:1634 aus.radio.amateur.misc:400 rec.radio.amateur.homebrew:12955 sci.electronics.components:1592 Hi I'm trying to obtain a VCO covering 1 - 2 gHz for use in a spectrum analyser project. I know Minicircuits (USA) manufacture a range of VCO modules but I am told that they are un-available in Australia due to future production being sold out. If you know of an outlet for these units, or any other types, or have a proven circuit, please let me know. Many thanks in advance... Steve From lwbyppp@epix.net Tue Jan 30 16:25:58 1996 Path: news.epix.net!news.sprintlink.net!news.rain.org!usenet From: allenm@rain.org (Allen) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.swap Subject: WTB-QRP equipment Date: Sat, 27 Jan 1996 04:52:41 GMT Organization: RAIN Public Access Internet (805) 967-RAIN Lines: 6 Message-ID: <4ecb70$3q9@news.rain.org> NNTP-Posting-Host: @user01.term1.ventura.rain.org X-Newsreader: Forte Agent .99.82 Xref: news.epix.net rec.radio.amateur.homebrew:12948 rec.radio.amateur.equipment:24136 rec.radio.swap:55990 Looking for some qrp equipment in any condition name a price for what you got... also looking for el cheapo straight keys for the group to use..donations also gratefully accepted..tnx 73 Kb6pqg.....allenm@rain.org From lwbyppp@epix.net Tue Jan 30 16:25:59 1996 Path: news.epix.net!news.sprintlink.net!news.frontiernet.net!Empire.Net!news.net99.net!news.monmouth.com!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WD-40 vice Contact/Tuner Spray!! Date: 27 Jan 1996 06:52:15 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 7 Sender: root@newsbf02.news.aol.com Message-ID: <4ed3lf$15j@newsbf02.news.aol.com> References: <4e9a5d$c08@i-2000.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4e9a5d$c08@i-2000.com>, dougrand@i-2000.com (Prowler) writes: >Then upon returning home, I >would dip the radio into alcohol and blow it out with air pressure. I do that with my egg sandwichs. My wife objects to the smell though. I never tried it with a radio. From lwbyppp@epix.net Tue Jan 30 16:26:00 1996 Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.asu.edu!news.eas.asu.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!netcom12!faunt From: faunt@netcom12.netcom.com (Doug Faunt N6TQS +1-510-655-8604) Subject: Re: Adding lighting to Red Lion Controls counter modules In-Reply-To: eburton@buphy.bu.edu's message of 26 Jan 1996 18:41:51 GMT Message-ID: Sender: faunt@netcom12.netcom.com Organization: at home, in Oakland References: <4eb79f$efi@news.bu.edu> Date: Sat, 27 Jan 1996 08:15:05 GMT Lines: 5 Xref: news.epix.net sci.electronics.components:1605 rec.radio.amateur.homebrew:12965 It helped, a lot. They make a counter module that's got a larger display, and is backlit, in red or yellow/green. I'm going to use one to keep track of the setting of a DK3 mobile antenna. 73, doug From lwbyppp@epix.net Tue Jan 30 16:26:01 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!math.ohio-state.edu!uwm.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: League publishes yet another mpu article sans software Message-ID: <1996Jan27.135707.1661@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ebh33$1uj@ixnews6.ix.netcom.com> Date: Sat, 27 Jan 1996 13:57:07 GMT Lines: 32 In article <4ebh33$1uj@ixnews6.ix.netcom.com> rmmiller@ix.netcom.com(Robert M. Miller ) writes: >Well unless my eyes have failed me, my December QEX just arrived >complete with a feature article on a mpu based receiver controller that >is cute and usable, but like the antenna tuner article this article >does not offer any vehicle to obtain source code--but the author's >company is willing to sell a kit; a kit which looks to be reasonably >price, but a commercial product none the less. This again brings up >the question of article vs. review. Perhaps a few letters to our >elected Division Directors would bring this to the attention of League >officials-- You think that's bad, look at the Feb 96 QST. There's a "feature" article that's nothing but an advertisement for the 96 Handbook. And one of the columns answers reader questions with instructions for ordering this League publication or that League publication rather than just giving a straight forward answer to the question. It appears that the feature and columnist pages of "the catalog" have now been co-opted to advertise League wares as well as the color ad section in the back. I don't know about you, but I find this distressing. I expect ads in QST, I expect ads for ARRL products in QST, but I don't expect the editorial content to be turned into nothing more than advertisements. I think it has become time to take a hard look at ARRL publication editorial policy. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Tue Jan 30 16:26:02 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: dcimp@aol.com (DCimp) Newsgroups: rec.radio.amateur.homebrew Subject: Syntor Manual Date: 27 Jan 1996 14:43:23 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 3 Sender: root@newsbf02.news.aol.com Message-ID: <4edv8r$h8m@newsbf02.news.aol.com> Reply-To: dcimp@aol.com (DCimp) NNTP-Posting-Host: newsbf02.mail.aol.com I am In need of a Syntor Manual, Not the X or the X9000 version, just the Plain old Syntor. I need one soon, anybody got one for sale? DCimp@AOL.COM From lwbyppp@epix.net Tue Jan 30 16:26:03 1996 Path: news.epix.net!news.sprintlink.net!news.yab.com!wierius!stat!uucp.primenet.com!nntp.news.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: mawyatt@ix.netcom.com(Michael A. Wyatt ) Newsgroups: aus.electronics,aus.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.components Subject: Re: Need VCO, 1-2 gHz - circuit or off-shelf Date: 27 Jan 1996 15:13:04 GMT Organization: Netcom Lines: 24 Message-ID: <4edfe0$d5i@ixnews4.ix.netcom.com> References: <4ebi51$qa8@oznet11.ozemail.com.au> NNTP-Posting-Host: ix-stp-fl3-12.ix.netcom.com X-NETCOM-Date: Sat Jan 27 7:13:04 AM PST 1996 Xref: news.epix.net aus.electronics:1642 aus.radio.amateur.misc:404 rec.radio.amateur.homebrew:12969 sci.electronics.components:1614 In <4ebi51$qa8@oznet11.ozemail.com.au> sjandrew@ozemail.com.au (Steve Andrew) writes: > >Hi >I'm trying to obtain a VCO covering 1 - 2 gHz for use in a >spectrum analyser project. I know Minicircuits (USA) >manufacture a range of VCO modules but I am told that they >are un-available in Australia due to future production being >sold out. > >If you know of an outlet for these units, or any other >types, or have a proven circuit, please let me know. > >Many thanks in advance... Steve > > > Steve, You might try Avantek or Z-Comm in the US. Hope this helps, Mike Wyatt From lwbyppp@epix.net Tue Jan 30 16:26:04 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!info.ucla.edu!agate!holonet!colossus.holonet.net!minfox!tom.alldread From: tom.alldread@minfox.com (Tom Alldread) Newsgroups: rec.radio.amateur.homebrew Subject: Duplexer to Bandpass Filter Date: Sat, 27 Jan 1996 15:26:00 GMT Message-ID: <9601271820359298@minfox.com> Organization: MINFOX Courtenay, BC (604)-337-2023 Distribution: world References: <1996Jan24.235015.28694@gov.nt.ca> Lines: 22 V>I have a 3 cavity mobile VHF duplexer that I would like to re-configure >as a 2m bandpass filter. Is this possible? How would I go about it? Hi John: You have made curious. I wonder what a 3 cavity mobile duplexer is used for? If the cavities are full size band pass/ band reject type you could possibly utilized one ~as is~ for a front end band pass filter but it probably will limit your operational band coverage on 2 meters. You would also need to make sure the band reject notch is tuned well away from the band segment of interest. BTW Sinclabs had a 2 meter two cavity bandpass filter designed for mobile operation available a couple of years ago. 73 de VE7TMA --- * QMPro 1.53 * Very Best Regards, tom.alldread@minfox.com From lwbyppp@epix.net Tue Jan 30 16:26:06 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!prodigy.com!usenet From: JLAN98A@prodigy.com (Kenneth Burtchaell) Newsgroups: rec.radio.amateur.homebrew Subject: PCB artwork transfer Date: 27 Jan 1996 15:38:04 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 8 Distribution: world Message-ID: <4edgss$1iha@useneta1.news.prodigy.com> NNTP-Posting-Host: inugap3.news.prodigy.com X-Newsreader: Version 1.2 I am looking for successful ways to transfer printed artwork to board for etch resist.I seem to have a lot of difficulty cleaning paper off the board after transfer without damaging traces.I can use transparencies with no problems but paper backed images is another story.Is there someother paper besides ordinary printer paper that can be used? 73 Ken Burtchaell W6GHV From lwbyppp@epix.net Tue Jan 30 16:26:07 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ksu.ksu.edu!cis.ksu.edu!mac From: mac@cis.ksu.edu (Myron A. Calhoun) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Grapefruit powered XMTR? Date: 27 Jan 96 17:48:02 GMT Organization: Kansas State University Lines: 19 Message-ID: References: <1996Jan16.194742.28225@llyene.jpl.nasa.gov> <4di8v6$ <9601211428464864@saloon.bcbbs.net> NNTP-Posting-Host: zaurak.cis.ksu.edu X-Newsreader: NN version 6.5.0 #6 (NOV) clinton.peebles@saloon.bcbbs.net (Clinton Peebles) writes: >B>re: grapefruit powered Transmitter, Did Gilligans Island know about it? >Didn't the professor make a battery charger out of coconuts on one >episode? They had to stir their coconuts. For a senior EE lab project many, many years ago, I powered a small receiver from what I called a "primary" cell, or "P-cell" for short.' Yes, the electrolyte was pee (urine, for the highly-educated). :-) Got an "A" on the Project, too! --Myron. -- # Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridg e # Myron A. Calhoun, PhD EE; Assoc. Prof. (913) 532-6350 work, 532-7353 fax # Amateur packet radio: W0PBV@N0ARY.#NOCAL.CA.USA.NOAM 539-4448 hom e # NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol ) From lwbyppp@epix.net Tue Jan 30 16:26:08 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: NiCAD Charger Schematic? Date: 27 Jan 1996 17:50:37 GMT Organization: Dover Research Corp. Lines: 6 Message-ID: <4edold$d4q$1@mhafn.production.compuserve.com> I should really get the growing batch of Circad schematics and Pcb files and put them someplace! There is the mobius.gmu.edu site that has the old demo but I'm not clear on what else can be plunked in that area. Any suggestions on a site everyone can use? -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Tue Jan 30 16:26:09 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ksu.ksu.edu!cis.ksu.edu!mac From: mac@cis.ksu.edu (Myron A. Calhoun) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QST Antenna Tuner Kit-First Impressions Date: 27 Jan 96 17:52:11 GMT Organization: Kansas State University Lines: 18 Message-ID: References: <1996Jan6.185503.8669@ohstpy> NNTP-Posting-Host: zaurak.cis.ksu.edu X-Newsreader: NN version 6.5.0 #6 (NOV) garland@ohstpy.mps.ohio-state.edu (JIM GARLAND) writes: >My only quibble with the kit is .... >the traces seem to be extremely thin.... My first PC board (quite some years ago) was for a "boxcar" (sample and hold) circuit, and it refused to work properly until we jumpered one particular trace with a wire to increase its current-carrying capacity. I learned a lot in that project! --Myron. -- # Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridg e # Myron A. Calhoun, PhD EE; Assoc. Prof. (913) 532-6350 work, 532-7353 fax # Amateur packet radio: W0PBV@N0ARY.#NOCAL.CA.USA.NOAM 539-4448 hom e # NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol ) From lwbyppp@epix.net Tue Jan 30 16:26:10 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!news.kei.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.ksu.ksu.edu!cis.ksu.edu!mac From: mac@cis.ksu.edu (Myron A. Calhoun) Newsgroups: rec.radio.amateur.homebrew Subject: What is an A59RX tube from Cetron? Date: 27 Jan 1996 18:10:18 GMT Organization: Kansas State Univ, Dept. of Computing and Information Sciences Lines: 16 Distribution: world Message-ID: NNTP-Posting-Host: zaurak.cis.ksu.edu Someone just gave me, the local certified "junk collector", a dozen A59RX tubes in boxes, plus a couple of loose ones. I can't find it in any of my many manuals. It LOOKS like some kind of photodetector, with a half-cylinder "reflector", but, instead of running down the axis, the "collector" wire is a square loop kinda runing around the edge of the half-cylinder. Can anyone tell me what it really is. I won't add it to the clutter if it doesn't have some potential use greater than a one-time rifle target. --Myron. -- # Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridg e # Myron A. Calhoun, PhD EE; Assoc. Prof. (913) 532-6350 work, 532-7353 fax # Amateur packet radio: W0PBV@N0ARY.#NOCAL.CA.USA.NOAM 539-4448 hom e # NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol ) From lwbyppp@epix.net Tue Jan 30 16:26:12 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!in1.uu.net!lexis-nexis!news From: mds@lexis-nexis.com (Mike Suhar) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PCB artwork transfer Date: 27 Jan 1996 18:27:16 GMT Organization: LEXIS-NEXIS Lines: 61 Distribution: world Message-ID: <4edqq4$jmc@meaddata.lexis-nexis.com> References: <4edgss$1iha@useneta1.news.prodigy.com> NNTP-Posting-Host: n2dhcp174.lexis-nexis.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 In article <4edgss$1iha@useneta1.news.prodigy.com>, JLAN98A@prodigy.com says.. . > >I am looking for successful ways to transfer printed artwork to board for >etch resist.I seem to have a lot of difficulty cleaning paper off the >board after transfer without damaging traces.I can use transparencies >with no problems but paper backed images is another story.Is there >someother paper besides ordinary printer paper that can be used? > > 73 Ken Burtchaell W6GHV > Ken, While I use the toner transfer method to make quick boards I still fall back t o the photographic method for more complicated boards or those that I want to be near perfect. I have not found a way to get a good transfer from a paper source. I have been able to do it with photographic methods. GC Electronics had a film (I guess they still do) that could be used to lift a n image from a printed source to create a negative. It is an interesting proces s that they used. They put the film on top of the paper immage. They used the reflectivity of the paper, white vs the black traces, to expose the film. The reflection caused more exposure over the white areas than the black traces. Yo u could create a positive or a negative. One required a second sheet of film to reverse the image. This is more work than using a transparency for the original artwork. I don't use this method unless I a using artwork from a magazine. Most of the time I create my own artwork and print it on transparency using my Laerjet 4+ printer. I then purchase presensitized (positive type) PC boards from PCB Kits. I gave up on "spray your own resist" since I never could get the stuff to stick or be consistant in thickness. Lay the transparency over the presensitized board between a piece of glass. Expose with a photoflood light. Develope the board in a developer from PCB Kits. Let dry and then dum p in the etch tank. It is actually easy to do and does not take much more time than the toner transfer method. You don't need a darkroom or any special equipment. I use a 40watt light bulb in my utility room when working with the sensitized board. The only "photograph" equipment I bought was the photoflood . A 3x6 single sided epoxy-glass board runs around $3.33, double sided is $3.81. These are year old prices so they may have changed slightly. Developer was $4.95/quart the last time I bought some. Standard board sizes range from 4x4 inches to 12x12. I never see this company advertise in any ham magazines. I ran across them at the Dayton Hamvention several years ago. I called them last week so I know they are still in business. Give them a call and request information if you want to try the photography method. PCB Kits 750 Mariday Lake Orion, MI 48362 (810) 693-0328 Owner: Steven Springstube Good Luck Mike Suhar, WB8GXB NOTE: I am not affilated with PCB Kits. I am just a customer that liked thei r product. From lwbyppp@epix.net Tue Jan 30 16:26:13 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.compuserve.com!newsmaster From: <73447.325@compuserve.com> Newsgroups: rec.radio.amateur.homebrew Subject: Baked Black Wrinkle Paint Date: 27 Jan 1996 19:25:22 GMT Organization: CompuServe Incorporated Lines: 5 Message-ID: <4edu72$k5e@dub-news-svc-2.compuserve.com> NNTP-Posting-Host: ad26-130.compuserve.com Content-Type: text/plain Content-length: 152 X-Newsreader: AIR Mosaic (16-bit) version 4.00.08.32 I'm looking for someone to replaint a small metal base in its original, black wrinkle color and finish. Anyone out there that can help? -Paul, N9AZ From lwbyppp@epix.net Tue Jan 30 16:26:13 1996 Path: news.epix.net!news.sprintlink.net!usit.net!news From: sfritts@usit.net (Steven Fritts) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Any Mods for TM-201? Date: Sun, 28 Jan 1996 00:28:05 GMT Organization: United States Internet, Inc. Lines: 9 Message-ID: <4eeg4l$97k@news.usit.net> Reply-To: sfritts@usit.net NNTP-Posting-Host: bway-slip71.dynamic.usit.net X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.amateur.equipment:24193 rec.radio.amateur.homebrew:12976 Just wondered if there are any mods for the Kenwood TM-201 2 meter rig. Thanks, Steve From lwbyppp@epix.net Tue Jan 30 16:26:14 1996 Path: news.epix.net!news.sprintlink.net!ddi2.digital.net!usenet From: russ@gslink.net (Russ LeBlanc) Newsgroups: rec.radio.amateur.homebrew Subject: Thermally conductive epoxy for heat sinking???? Date: 28 Jan 1996 00:42:15 GMT Organization: Central FL Listeners Group Lines: 14 Message-ID: <4eegp7$5ik@ddi2.digital.net> NNTP-Posting-Host: @ppp167.gslink.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.6 I have a need for heat sinking a TO-220 to the instrument case without using screws (dielectric breakdown/hi-pot test issues). Any folk out there know of such a compound? I heard it exists (and is $$$), any pointers out there would be much appreciated. If you could e-mail me a reply it would be best, as I can only access this group on weekends (and my server doesn't keep postings for more than a few days- might miss the replies). Thanks in advance, Russ russ@gslink.net From lwbyppp@epix.net Tue Jan 30 16:26:15 1996 Path: news.epix.net!news.sprintlink.net!news.netnet.net!kryten.awinc.com!news From: jenna.design@awinc.com Newsgroups: rec.radio.amateur.homebrew Subject: COIL WINDING PROGRAM (freeware Win95 only) Date: 28 Jan 1996 01:11:33 GMT Organization: QRP Central Lines: 24 Message-ID: <4eeig5$3qv@kryten.awinc.com> NNTP-Posting-Host: pme002.awinc.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 Coil Winding Program for Windows95 CBVSR1.ZIP COILBUILDER VSR can be found on the SimTel network 1 example...... ftp.coast.net /SimTel/Win95/HamRadio/cbvsr1.zip CBVSR1.ZIP allows the Amateur Radio homebrew enthusiast to design a variety of inductors for QRP Ham radio projects. Winding data for powdered-iron, ferrite, air and temperature-stable VFO core inductors can be designed with this software. In addition, CBVSR.ZIP can read, write and print ASCII files which are displayed in its integral text editor. A linked Help file is included. Special requirements: Windows 95 , mouse. FREEWARE Thanks From lwbyppp@epix.net Tue Jan 30 16:26:17 1996 Path: news.epix.net!news.sprintlink.net!usit.net!arcade-slip21.dynamic.usit.net!user From: kaboom@usit.net (Michael) Newsgroups: rec.radio.amateur.homebrew Subject: Help: MS230 Mini o'scope Date: 28 Jan 1996 05:17:52 GMT Organization: United States Internet, Inc. Lines: 12 Message-ID: NNTP-Posting-Host: 199.1.54.37 I just acquired a Non-Linear Systems MS230 mini oscilloscope at a hamfest. The thing works, but it has an oddity I can't figure out. With the trigger set to "internal," everything works as it should. When I set it to "auto," it free-runs, as it should. But, then it will not sync to a signal at all... it just continues to free-run. I went through the scope and tested and/or swapped out just about every semiconductor in it (luckily, the ICs are in sockets, and are common CMOS). Nothing helps. Anybody have one of these things? Is it possible it was designed that way? Anybody have a schematic for it? Please reply via email, and thanks for any help you can give me. For that matter, is NLS still in business? Michael From lwbyppp@epix.net Tue Jan 30 16:26:18 1996 Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!news.zeitgeist.net!news.pixi.com!pixihost From: djarrell@pixi.com (Dave Jarrell) Newsgroups: rec.radio.amateur.homebrew Subject: NEED BOOK FOR TIMEWAVE DSP-9 Date: Sun, 28 Jan 96 06:20:15 GMT Organization: Amateur Radio Station AH6OB Lines: 12 Message-ID: <4ef4js$eoa@rigel.pixi.com> NNTP-Posting-Host: gorgax18.pixi.com X-Newsreader: News Xpress Version 1.0 Beta #4 Need help finding book for a Timewave DSP-9 Digital Signal Processor. From the Desk of: Dave Jarrell Amateur Radio Station - AH6OB Honolulu, HI E-mail: djarrell@pixi.com From lwbyppp@epix.net Tue Jan 30 16:26:18 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!hookup!news.nstn.ca!coranto.ucs.mun.ca!InfoNET.st-johns.nf.ca!sba3020 From: sba3020@InfoNET.st-johns.nf.ca (Carl Hodder) Newsgroups: rec.radio.amateur.homebrew Subject: Golden Eagle Manual Date: 28 Jan 1996 08:19:39 GMT Organization: St. John's InfoNET Lines: 6 Message-ID: <4efbir$sl2@coranto.ucs.mun.ca> NNTP-Posting-Host: infonet.st-johns.nf.ca X-Newsreader: TIN [version 1.2 PL2] Wanted a Service Manual for a Browning Golden Eagle MK III tube type CB Radio. I am also trying to find out all about the Golden eagle radios and clubs, usergroups, etc. E-mail me if you have any info. Thanks, Carl. From lwbyppp@epix.net Tue Jan 30 16:26:20 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!news.west.net!usenet From: mark@reson.com (qrk) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Thermally conductive epoxy for heat sinking???? Date: Sun, 28 Jan 1996 09:02:56 GMT Organization: Marginal Lines: 20 Message-ID: <4efebc$9ed@daffy.sb.west.net> References: <4eegp7$5ik@ddi2.digital.net> Reply-To: mark@reson.com NNTP-Posting-Host: term1-26.sb.west.net X-Newsreader: Forte Free Agent 1.0.82 russ@gslink.net (Russ LeBlanc) wrote: >I have a need for heat sinking a TO-220 to the instrument case without >using screws (dielectric breakdown/hi-pot test issues). Any folk out >there know of such a compound? I heard it exists (and is $$$), any >pointers out there would be much appreciated. Omega Engineering makes thermally conductive epoxies. I suggest getting their catalog since they have a few different types. They are very good at responding to queries. Phone: (800) 826-6342 Fax: (203) 359-7990 You might want to check out Thermaloy (214) 243-4321 or Wakefield Engineering (617)245-5900. One of them also make a thermally conductive epoxy. - Mark Chun | mark@reson.com | Santa Barbara, California From lwbyppp@epix.net Tue Jan 30 16:26:20 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!hearst.acc.Virginia.EDU!freenet.vcu.edu!cabell.vcu.edu!not-for-mail From: jwill@cabell.vcu.edu (J. Sherwood Williams) Newsgroups: rec.radio.amateur.homebrew Subject: Re: tuning in CW/SSB stations w/ AM only radio? Date: 28 Jan 1996 14:46:52 -0500 Organization: Virginia Commonwealth University Lines: 15 Distribution: world Message-ID: <4egjrc$38d@cabell.vcu.edu> References: <4d7dvb$m8b@detroit.freenet.org> <4e3aml$k8e@missun.cus.cul.ca> NNTP-Posting-Host: cabell.vcu.edu There is a good article on adding a BFO to an AM transistor radio in the August 1985 issue on QST Page 34 ... try your local library for a copy of the article. I want to add a BFO to the tiny Sony SW1 .... first, I need to get hold of a copy of the schematics ... guess its another $15.00 to Sony for the service manual. I don't know if I will be able to fit the above circuit into the radio, because it requires a FT-50-43 toroid core and an IF transformer.; might be too bulky. Robert S. Williams: KD4ZPH From lwbyppp@epix.net Tue Jan 30 16:26:21 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!newsfeed.internetmci.com!EU.net!sun4nl!news.nic.surfnet.nl!news.pi.net!news From: c_struyk@pi.net Newsgroups: rec.radio.amateur.homebrew Subject: Needs: Power Module for 1299 Mhz TX homebrew Date: Sun, 28 Jan 96 15:26:45 PDT Organization: Planet Internet Lines: 20 Message-ID: NNTP-Posting-Host: bre45.pi.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage Hello dr. Om's, I need a power module for 23cm (1299 Mhz) applications I'm running here the PI1GTB interlink station for TCPIP packetradio in the Southern parts of the Netherlands... For this pupose i'v build myself an Interlink-I sem-duplex tranceiver (german design). The outputpower is only 600 mW I'm now looking for a power module and schematics to build a little amplifier for say 3 to 5 watts on 1299 Mhz.. Who can help.. Thanks for reading 73' pa0gtb, Cor From lwbyppp@epix.net Tue Jan 30 16:26:23 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!newsxfer.itd.umich.edu!news.mtu.edu!news.mtu.edu!not-for-mail From: cmlong@mtu.edu (mike) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.swap,rec.radio.amateur.digital.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.amateur.antenna Subject: Special Events Station!!! Date: 28 Jan 1996 17:04:14 -0500 Organization: Michigan Technological University Lines: 50 Message-ID: <4egrsu$rmm@techsrv1.tech> NNTP-Posting-Host: techsrv1.tech.mtu.edu X-Newsreader: TIN [version 1.2 PL1] Xref: news.epix.net rec.radio.amateur.equipment:24230 rec.radio.amateur.homebrew:12991 rec.radio.amateur.misc:97371 rec.radio.swap:56161 rec.radio.amateur.digital.misc:13813 rec.radio.amateur.policy:32810 rec.radio.amateur.space:6209 rec.radio.amateur.antenna:18699 Thank-you for reading this. My name is Michael Long (KB8WPE) and I am the Public Relations Manager for the Husky Amateur Radio Club (HARC) whose callsign is W8YY. The club is located on the Michigan Technological University campus. Starting on February 1, 6am EST, and continuing on until February 3, 6am EST, W8YY will be running a Special Events station for Michigan Tech's Winter Carnival '96. The frequencies listed below are the most likely place we will be operating. For this Special Events station we have 8"x11" certificates that would look great on anyones' wall! All you have to do is contact us and then send a QSL with a self addressed stamped envelope to receive the certificate. Here are the frequencies: Band Frequency Mode Time 160m 1.90 MHz LSB 8pm-8am 75m 3.90 MHz LSB 10pm-8am 40m 7.25 MHz LSB 7pm-10pm 20m 14.250 MHz USB majority of the day (8am-7pm) 17m 18.150 MHz USB if open 8am-7pm 15m 21.350 MHz USB if open 8am-7pm 10m 28.40 MHz USB if open 8am-7pm 2m 144.2 MHz USB All the time 146.58 MHz FM All the time 70cm 432.100 MHz USB All the time Again, thank-you for reading this message and all of us here hope to here from you during the Special Events station! For any more info. email me at cmlong@mtu.edu or the Club President, Dave Gillahan, at dmgillah@mtu.edu You can also check out our homepage at http://techsrv1.tech.mtu.edu:8080/harc.html Though it is just beginning it does have a little information on it. Sincerely, Mike Long -KB8WPE- -- /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ \ Michael Long || Public Relations Manager / / Callsign: KB8WPE || for HARC (W8YY) \ \ Email: cmlong@mtu.edu || Email: harc-l@mtu.edu / / Phone: (906)487-5664 || Majors: EET and EMT \ \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/ From lwbyppp@epix.net Tue Jan 30 16:26:25 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!gatech!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: vinyn1vc@aol.com (VINY N1VC) Newsgroups: rec.radio.amateur.homebrew Subject: WANT YIG Date: 28 Jan 1996 17:08:34 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 6 Sender: root@newsbf02.news.aol.com Message-ID: <4egs52$t58@newsbf02.news.aol.com> Reply-To: vinyn1vc@aol.com (VINY N1VC) NNTP-Posting-Host: newsbf02.mail.aol.com Need Yig Oscillator for BWO replacement in spectrum analyzer. VINYN1VC From lwbyppp@epix.net Tue Jan 30 16:26:26 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: WD-40 vice Contact/Tuner Spray!! Message-ID: <1996Jan28.204639.8744@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4e6tbm$hdv@whidbey.whidbey.com> <4e9a5d$c08@i-2000.com> Date: Sun, 28 Jan 1996 20:46:39 GMT Lines: 38 In article <4e9a5d$c08@i-2000.com> dougrand@i-2000.com (Prowler) writes: >WD-40 is great stuff. I used to work building bridges and several >times my walkie talkie (ham) fell into the salt water. My standard >procedure was to leave it where it fell, remembering where it was. I >would go back after work with SCUBA, retrieve the radio and put it >into a bucket of water from the bay. Then upon returning home, I >would dip the radio into alcohol and blow it out with air pressure. I >did that several times until I was sure all the water I could get to >was displaced. Then, I would spray it full of WD-40 and blow it out >again, doing this at least two times to get the WD-40 into all the >crevices. I never damaged a radio and did this at least 4 times with >one unit. Only the battery wire from the terminal to the battery >would burn out while it was under water. I would take the radio to >work the next day. WD-40 is a good water displacer (that's what the WD stands for), it's a fair penetrating oil, and a poor lubricant. It can leave a sticky residue which can accumulate and hold dirt. There are better products for each of its uses, though few are as universal. A better way to deal with electronic equipment dunked in salt water is to soak it in a warm fresh water bubble bath solution for an hour or two. Then rinse is throughly with clean warm water. This will remove the salt residue much more completely than using alcohol or WD-40, neither of which are solvents for salt. You can then blow out as much water as possible and let it air dry in a warm dry place overnight. This is what we do to cameras our photographers dunk in salt water. We avoid using WD-40 because of its residue's unfortunate tendency to accumulate and trap dirt, which isn't good for the optics or the recorder mechanism. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Tue Jan 30 16:26:27 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!crl11.crl.com!not-for-mail From: mbstone@crl.com (Michael Stone) Newsgroups: rec.radio.scanner,rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.policy Subject: Re: TSCM Counter Surveillance & Technical Security Page Followup-To: rec.radio.scanner,rec.radio.shortwave,misc.legal.computing,comp.security.unix,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.policy Date: 28 Jan 1996 21:13:08 -0800 Organization: CRL Dialup Internet Access Lines: 19 Message-ID: <4ehl14$sep@crl11.crl.com> References: NNTP-Posting-Host: crl11.crl.com X-Newsreader: TIN [version 1.2 PL2] Xref: news.epix.net rec.radio.scanner:44567 rec.radio.shortwave:69400 misc.legal.computing:19838 comp.security.unix:24081 rec.radio.amateur.antenna:18708 rec.radio.amateur.equipment:24256 rec.radio.amateur.misc:97399 rec.radio.amateur.digital.misc:13821 rec.radio.amateur.homebrew:12997 rec.radio.amateur.policy:32827 James M. Atkinson, Communications Engineer (jmatk@tscm.com) wrote: : Here is the current list of frequencies used for bugging, technical : surveillance and similar activities. : Outband Equipment : ANY Television broadcast or Cable TV frequency : ANY FM radio broadcast frequency : ANY Paging or Beeper frequency : ANY Cellular Telephone frequency : Keep in mind that the federal government can use virtually any : frequency between DC and light. : Summary (this will catch 99.99% of all Non-Intell/Diplomatic RF bugs) Gee whiz. From lwbyppp@epix.net Tue Jan 30 16:26:28 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!news.jersey.net!ns2.mainstreet.net!sloth.swcp.com!usenet From: bones@swcp.com (Gary Bonebrake) Newsgroups: rec.radio.amateur.homebrew Subject: FS: 3CX800A7 & More Date: 28 Jan 1996 21:38:20 GMT Organization: Southwest Cyberport Lines: 13 Message-ID: <4egqcc$825@sloth.swcp.com> NNTP-Posting-Host: ppp67.swcp.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 FOLLOWING ITEMS UP FOR GRABS: UNIT ITEM QTY PARTNO MANUF CONDITION PRICE ---- --- -------- -------- -------------------- ----- 1 1 3CX800A7 EIMAC NEW - SEALED BOX $300 2 2 811A SVETLANA NEW - WITH 15 SOCKETS & PLATE CAPS 3 2 4CX250B EIMAC BOX MARKED "SPARE" 20 4 2 4CX400A SVETLANA NEW - WITH 175 SOCKETS & PLATE CAPS ADDS UP TO $720 . . . WILL UNLOAD LOT FOR $450, INCL SHIPPING. CONTACT K8BI@SWCP.COM - NO PHONE CALLS PLEASE. From lwbyppp@epix.net Tue Jan 30 16:26:29 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!miwok!news.wco.com!m14 From: ecgallup@mlode.com (Ed Gallup) Newsgroups: rec.radio.amateur.homebrew Subject: wrinkle paint Date: Sun, 28 Jan 96 22:22:35 GMT Organization: Mother Lode InterNet Lines: 6 Message-ID: <4egsuk$40b@news.wco.com> NNTP-Posting-Host: m14.mlode.com X-Newsreader: News Xpress Version 1.0 Beta #4 Can anyone advise where wrinkle paint may be obtained, (such as black or gray), or how it may be made. Thanks. Ed ecgallup@mlode.com From lwbyppp@epix.net Tue Jan 30 16:26:30 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!hookup!tank.news.pipex.net!pipex!lade.news.pipex.net!pipex!news00.sunet.se!sunic!nntp.coast.net!zombie.ncsc.mil!news.duke.edu!usenet From: jimbob@acpub.duke.edu (James P. Meyer) Newsgroups: rec.radio.amateur.homebrew Subject: Re: tuning in CW/SSB stations w/ AM only radio? Date: Sun, 28 Jan 1996 23:19:07 GMT Organization: Duke University, Durham, NC, USA Lines: 12 Message-ID: <310c03fb.7626226@news.duke.edu> References: <4d7dvb$m8b@detroit.freenet.org> <4e3aml$k8e@missun.cus.cul.ca> <4egjrc$38d@cabell.vcu.edu> NNTP-Posting-Host: async139.async.duke.edu X-Newsreader: Forte Agent .99c/16.141 jwill@cabell.vcu.edu (J. Sherwood Williams) wrote: >I want to add a BFO to the tiny Sony SW1 .... first, I need to get >hold of a copy of the schematics ... guess its another $15.00 >to Sony for the service manual. I don't know if I will be able to fit >the above circuit into the radio, because it requires a FT-50-43 >toroid core and an IF transformer.; might be too bulky. No reason I know of why it *has* to be internal. Just build it in a small (plastic) box with its own battery and put it close to the SW1. Jim From lwbyppp@epix.net Tue Jan 30 16:26:31 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!vitro.com!usenet From: millerrj@vitro.com (Robert Miller) Newsgroups: rec.radio.amateur.homebrew Subject: Need help to reduce mobile Hf Rig noise from Jeep Wrangler computer module Date: 29 Jan 1996 13:13:28 GMT Organization: Vitro Corp Lines: 10 Message-ID: <4eih5o$b2o@gatekeeper.vitro.com> NNTP-Posting-Host: bmiller.ms.vitro.com Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 I have an Icom 706 in my 1994 Jeep Wangler and I get a great deal of QRM (s9) noise when the ignition switch is in the on position even when the motor is not running. If i pull the fuse for the car's computer module the noise goes away. Does anyone know of a way to reduce this noise problem. Thanks for any help. Bob (N3TXB) From lwbyppp@epix.net Tue Jan 30 16:26:32 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!gatech!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!tank.news.pipex.net!pipex!demon!survival.demon.co.uk From: bill@survival.demon.co.uk (Bill Wright) Newsgroups: rec.radio.amateur.homebrew Subject: Chip set for SSB Short Wave Transmitter/Receiver Date: Mon, 29 Jan 1996 14:28:02 GMT Organization: Survival Power Lines: 13 Message-ID: <822925679.1506@survival.demon.co.uk> Reply-To: Bill Wright NNTP-Posting-Host: survival.demon.co.uk X-NNTP-Posting-Host: survival.demon.co.uk X-Newsreader: Forte Free Agent 1.0.82 Chip set for SSB Short Wave Transmitter/Receiver I am initiating a new design for a SSB Short Wave Transmitter/Receiver operating at 4.005 Meg. A chip set is required to form the base of the design. Pre production prototype is scheduled for completion June 96. Would be grateful for any information or help. From lwbyppp@epix.net Tue Jan 30 16:26:33 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!caen!uwm.edu!math.ohio-state.edu!usc!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: wrinkle paint Message-ID: <1996Jan29.151709.13202@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4egsuk$40b@news.wco.com> Date: Mon, 29 Jan 1996 15:17:09 GMT Lines: 26 In article <4egsuk$40b@news.wco.com> ecgallup@mlode.com (Ed Gallup) writes: > > Can anyone advise where wrinkle paint may be obtained, (such as black or >gray), or how it may be made. Thanks. > > Ed ecgallup@mlode.com Most good hardware stores carry an extensive line of spray paints, including wrinkle finish black. Try an Ace Hardware, True Value Hardware, or Home Depot. I prefer Krylon brand but there are others. One trick to getting a good wrinkle finish is to make sure the item to be painted is warm, and warm it further after painting. I sit the object on top of the boiler jacket (about 120 F) of the buidling heating system. In about 45 minutes to an hour, you'll have a nice wrinkle finish. One caution, for some reason only black gives a good wrinkle finish. If you want a different color, get the wrinkle with black, and then top that with whatever color you want after the black dries and wrinkles. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Tue Jan 30 16:26:34 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Radio Amateur Microwave Groups Date: 29 Jan 1996 15:53:58 GMT Organization: Dover Research Corp. Lines: 4 Message-ID: <4eiqim$51g$2@mhadf.production.compuserve.com> I just made my first contact on 1296.1MHZ So if you find such an area sign me up as well! -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Tue Jan 30 16:26:35 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Baked Black Wrinkle Paint Date: 29 Jan 1996 15:57:09 GMT Organization: Dover Research Corp. Lines: 11 Message-ID: <4eiqol$51g$3@mhadf.production.compuserve.com> I asked this same question a few years back. I was told that Harly Davidson dealers can order black Crackle paint that should be exactly what you want. Note that you need to do more than paint it on. It needs to cure in an oven and I can't comment on that. If you are an ARRL member you might want to contact Member services and ask for any old pieces on doing this properly. I just know some old QST bit has to talk about this. BTW I've got an old J-36 Bug (WWII Era) that some nut painted lime green. I'm going to figure out how to do this as well. Just don't know when I will have the time,. GL 73 CUL -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Tue Jan 30 16:26:36 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: League publishes yet another mpu article sans software Date: 29 Jan 1996 16:02:25 GMT Organization: Dover Research Corp. Lines: 12 Message-ID: <4eir2h$51g$4@mhadf.production.compuserve.com> Hi Gary, I have to check that out and see what your talking about. I'm no doubt totaly off base but I often get calls about things that are in the user manual. When I say "uhh have you read the manual." some folk get really teed off at me. "Why should I do that when I have your home phone #?" Anyhow I wonder if suggesting another book, Say Bill Or handbook would get you ire up? Is it just the self promotion angle? Or the lack of answers? If it is self promotion remember what Grandma said, "The squeeky oil gets the greese!" Or, "If I don't toot my horn who will?" Uncle Wayne? Anyway stop breaking all that stuff!!! 73 CUL -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Tue Jan 30 16:26:37 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: WANTED schematic of a IF-100 interface! Date: 29 Jan 1996 16:03:34 GMT Organization: Dover Research Corp. Lines: 3 Message-ID: <4eir4m$51g$5@mhadf.production.compuserve.com> Is the IF-100 the Yeasu RS232 converter? -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Tue Jan 30 16:26:38 1996 Message-ID: <161305Z29011996@anon.penet.fi> Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!tank.news.pipex.net!pipex!newsfeed.internetmci.com!howland.reston.ans.net!EU.net!news.eunet.fi!anon.penet.fi Newsgroups: rec.radio.amateur.homebrew From: an142028@anon.penet.fi (sorbie) X-Anonymously-To: rec.radio.amateur.homebrew Organization: Anonymous forwarding service Reply-To: an142028@anon.penet.fi Date: Mon, 29 Jan 1996 16:12:58 UTC Subject: Need ferrite beads..... Lines: 14 Anyone know where I can find some ferrite beads suitable for "RF choking" #22/#24 wiring to a FP connector on my transceiver? E-mail direct to pbock@melpar.esys.com. TNX ES 73, Paul, K4MSG --****ATTENTION****--****ATTENTION****--****ATTENTION****--***ATTENTION*** Your e-mail reply to this message WILL be *automatically* ANONYMIZED. Please, report inappropriate use to abuse@anon.penet.fi For information (incl. non-anon reply) write to help@anon.penet.fi If you have any problems, address them to admin@anon.penet.fi From lwbyppp@epix.net Tue Jan 30 16:26:39 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!ncrgw2.ncr.com!ncrhub2!ncrcae!news From: Bob Archer Subject: Re: WD-40 vice Contact/Tuner Spray!! Message-ID: Sender: news@ncrcae.ColumbiaSC.ATTGIS.COM (news) Reply-To: Bob.Archer@columbiaSC.ncr.com (archer) Organization: NCR GPGSC, Columbia X-Newsreader: DiscussIT 2.5.1.3 for MS Windows [AT&T Software Products Division] References: <4eiks1$l4a@pacific.mps.ohio-state.edu> Date: Mon, 29 Jan 1996 16:17:07 GMT Lines: 39 Jim, I'm with you in regards to dunking. But back in the 1950's I watched my father wash out radio chassis's with mineral spirits followed by soapy(Tide) water. He never dunked them, used a paint brush & quick rinse. He would also set them in the sun for a few days before reassembly. These were ones he purchased, fixed & resold. I now collect some of the same type that he did that to, but I don't think I will ever wash any of mine that way. Thanks for reminding me of the memories.... >==========James Garland, 1/29/96========== > >The suggestion to soak dirty rigs in warm water with bubble bath >raises a >question I've wondered about for years. I recall reading a Tektronix >service note years ago, in which dirty Tek scopes were washed out with >warm soapy water, rinsed, and air dried at a warm (100 degree) >temp for a >day or so. If I recall correctly (I read this about 30 years ago), the >xfmrs were removed, and afterwards the paper caps were replaced, and >switches lubricated. > >I've never had the nerve to try this technique. I just can't bring >myself to dunk, say, my Central Electronics 100V in the bathtub and let >it soak. I'd be interested in knowing others' experience with this >cleaning method. Is it really necessary to remove the transformers? What >happens to the cardboard sleeves of IF transformers? Does it hopeless >ruin paper capacitors? Are there other precautions to take? > >Jim W8ZR > Bob Archer N4ECO From lwbyppp@epix.net Tue Jan 30 16:26:40 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm From: tgm@netcom.com (Thomas G. McWilliams) Subject: Re: Thermally conductive epoxy for heat sinking???? Message-ID: Organization: Jot-Em Down Store and Library X-Newsreader: TIN [version 1.2 PL1] References: <4eegp7$5ik@ddi2.digital.net> <4efebc$9ed@daffy.sb.west.net> Date: Mon, 29 Jan 1996 16:18:34 GMT Lines: 10 Sender: tgm@netcom21.netcom.com qrk (mark@reson.com) wrote: : Omega Engineering makes thermally conductive epoxies. I suggest : getting their catalog since they have a few different types. Since thermal compound is essentially zinc oxide mixed with grease, I wonder if zinc oxide powder mixed with a little epoxy as a binder would be an acceptable thermal epoxy? I suspect it would work fine for many applications. Thomas KI4N From lwbyppp@epix.net Tue Jan 30 16:26:41 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet From: QRP%mimi@magic.itg.ti.com (D W Hemphill KC5NG) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WTB: 9-pin plugs for EFJ Date: 29 Jan 1996 16:41:01 GMT Lines: 11 Message-ID: <4eitat$g4n@mksrv1.dseg.ti.com> References: NNTP-Posting-Host: dhemphill.dseg.ti.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 Are you talking about the 9-pin octal-type power plugs and jacks? If so, I probably have a couple of each in my junque-box. Please confirm that this is what you are looking for, describe EXACTLY the style you need, and I'll see if I have any. If I do, they're yours free, if you repay the postage. Reply via private e-mail. 73, Dean KC5NG QRP%mimi@magic.itg.ti.com From lwbyppp@epix.net Tue Jan 30 16:26:42 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet From: QRP%mimi@magic.itg.ti.com (D W Hemphill KC5NG) Newsgroups: rec.radio.amateur.homebrew Subject: Re: CMOS SUPERKEYER II CURRENTS Date: 29 Jan 1996 16:46:02 GMT Lines: 13 Message-ID: <4eitka$g4n@mksrv1.dseg.ti.com> References: <9601031820348672@minfox.com> <4cmpim$2hn@premier1.premier1.net> <4d9rgp$dcs@news-f.iadfw.net> NNTP-Posting-Host: dhemphill.dseg.ti.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 The Super Keyer II is referred to as the K-1 Logi-Key these days. It's a fantastic invention! I built the November, 1990 QST version back then, still have it, no problems ever, only needs batteries changed about once a year, and I use it heavily. This is such a good design that Kenwood included it in the new TS-870S as standard equipment, with six pages in the manual telling how to use it. Wonderful device! Gotta have it!! 73 de KC5NG From lwbyppp@epix.net Tue Jan 30 16:26:42 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm From: tgm@netcom.com (Thomas G. McWilliams) Subject: Re: wrinkle paint Message-ID: Organization: Jot-Em Down Store and Library X-Newsreader: TIN [version 1.2 PL1] References: <4egsuk$40b@news.wco.com> Date: Mon, 29 Jan 1996 17:10:14 GMT Lines: 25 Sender: tgm@netcom21.netcom.com Ed Gallup (ecgallup@mlode.com) wrote: : Can anyone advise where wrinkle paint may be obtained, (such as black : or gray), or how it may be made. Thanks. PEP Boys "Manny, Moe, and Jack" automotive stores sell black wrinkle finish spray paint. It works fine. But follow the instructions on the can for best results. The manufacturer and part number is: plasti-kote Wrinkle Finish No. 217 Black plasti-kote Co. Inc. Medina, Ohio 44256 As I recall, several other colors are also available. If you don't have a PEP Boys nearby, then a hobby shop, paint store or hardware store could probably order it for you. It is not expensive, about the same price as any spray paint. 73, Thomas KI4N From lwbyppp@epix.net Tue Jan 30 16:26:44 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr9ip18.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Re: Looking for mechanical filters. Date: Mon, 29 Jan 1996 19:14:51 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 39 Message-ID: References: <310C3942.40B4@UTM.Edu> NNTP-Posting-Host: usr9ip18.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] Xref: news.epix.net rec.radio.amateur.homebrew:13021 rec.radio.swap:56283 In article <310C3942.40B4@UTM.Edu> Mark Mansfield writes: >From: Mark Mansfield >Subject: Looking for mechanical filters. >Date: Sun, 28 Jan 1996 21:04:34 -0600 >I'm looking for a pair of Collins (or equiv.) mechanical filters for a >CW receiver which I'm building. I'm planning on using one of the filters >in the front of the IF and using another in the "tail-ended" mode after >the last IF amp. The filters should be the same frequency with the tail- >ended filter 100 to 200 hertz wider than the first filter (this was >recommended in a book by Doug DeMaw although the same bandwidth should >work as well if the filters have the same frequency). >If you have any of these critters, drop me a note with specifics such >as part number, bandwidth and price. >I would also like to hear from anyone else that has used this technique >in a home built receiver. Haven't used Collins filters but have used 9 MHz KVGs in this application. (XF9B input, XF9A output) I know there is a theoretical advantage to having the second filter, but I didn't note much improvement in my HB receiver. There can be a complication in the AGC system though. After conversation with Wes Haywood, I decided to move the AGC pickoff ahead of the second filter. The time delay through the second filter was causing severe AGC pumping. See KN5S's article in a recent QEX for more on this. Assuming no i-f overload and a decent product detector, you basically suffer no more than 3 dB extra noise at the audio amp without the second filter. Of course if the first filter has poor stopband rejection or there is leakage around it, the second filter can help. Good luck, Wes -- N7WS >Thanks, >Mark From lwbyppp@epix.net Tue Jan 30 16:26:45 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!in1.uu.net!fred.net!triack.fred.net!user From: triack@fred.net (John Stalnaker) Newsgroups: rec.radio.amateur.homebrew Subject: SOURCE Code for SSTV Date: Mon, 29 Jan 1996 23:42:10 -0500 Organization: FredNet - Frederick, Md. Lines: 5 Message-ID: NNTP-Posting-Host: triack.fred.net looking for any source code for sstv thanks N3VTV John Stalnaker From lwbyppp@epix.net Tue Jan 30 16:26:46 1996 Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news.epix.net!news.sprintlink.net!uunet!in1.uu.net!wb3ffv!ppp48.bcpl.lib.md.us!dbaker From: dbaker@mail.bcpl.lib.md.us (Donald I. Baker) Subject: Re: 82 Repeater in Kansas City Sender: usenet@abs.net Message-ID: Date: Tue, 30 Jan 1996 10:21:39 GMT X-Nntp-Posting-Host: ppp48.bcpl.lib.md.us References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> Organization: Reville Engineering Services X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] Lines: 47 Xref: news.epix.net rec.radio.amateur.policy:32876 rec.radio.amateur.antenna:18735 rec.radio.amateur.equipment:24320 rec.radio.amateur.homebrew:13023 rec.radio.amateur.digital.misc:13847 In article rob@pe1chl.ampr.org (Rob Janssen) writ es: >From: rob@pe1chl.ampr.org (Rob Janssen) >Subject: Re: 82 Repeater in Kansas City >Date: Tue, 30 Jan 1996 09:24:14 GMT >In <310B8C36.5D9@magnum.wpe.com> Eddie Caffray writ es: >> On the 146.85 repeater here in Central NY we had trouble with one user also . He made it that >>no one would even monitor the reapeater anymore. The club voted to ban him a nd we did. The >>reapeater is a great place to be again. >How do you manage to effectively ban malicious users from a repeater? >Of course this problem is known all over the world, but at least over >here we have not yet found an effective way of stopping them. How do >you do that? >Rob >-- >+------------------------------------+--------------------------------------+ >| Rob Janssen rob@knoware.nl | BBS: +31-302870036 (2300-0730 local) | >| AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU | >+------------------------------------+--------------------------------------+ Technical solutions do exist. Using a "TX-ID" board, which uniquely fingerprints each transmitter and a PC one can "slectively" include or preclude individual users. The board was not meant for that purpose, but with just a little Basic of C codes, it workd just fine. It is especially easy if you have a single or limited number of receive site. Good luck and Have fun. Don Donald I. Baker Reville Engineering Services 4619 Schenley Road Baltimore, MD 21210-2525 (410) 467-7163 Custon Harsh Environment Computers and RF Products "Where no PC has gone before..." From lwbyppp@epix.net Tue Jan 30 16:26:47 1996 Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Jon Bloom Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew Subject: CCITT fax via radio? Date: Tue, 30 Jan 1996 12:35:27 -0500 Organization: American Radio Relay League Lines: 13 Message-ID: <310E56DF.3AC3@arrl.org> NNTP-Posting-Host: mgate.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win95; I) Xref: news.epix.net rec.radio.amateur.digital.misc:13846 rec.radio.amateur.homebrew:13022 I'm looking for information from anyone who has developed a technique for transferring CCITT group-3 fax (i.e., standard office fax machine data) via radio. The "ideal" system would be one wherein a person at point A stuffs a document into a fax machine and it comes rolling out of a fax machine at point B, with the connection between the points being a radio link. But I'm interested in *any* techniques being used to achieve fax-via-radio. (Note: NOT WEFAX, APT or what-have-you. Just G3 fax!) Thanks. -- Jon Bloom, KE3Z | jbloom@arrl.org American Radio Relay League | 225 Main St., Newington CT 06111 | From lwbyppp@epix.net Mon Feb 05 21:32:20 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!usc!news.cerf.net!newsserver.sdsc.edu!newshub.csu.net!charnel.ecst.csuchico.edu!waldorf.csc.calpoly.edu!isnews.csc.calpoly.edu!farad.elee.calpoly.edu!ceustaqu From: Cal Eustaquio Newsgroups: rec.radio.amateur.homebrew Subject: WTB: 9-pin plugs for EFJ Date: Thu, 25 Jan 1996 16:40:57 -0800 Organization: Cal Poly, San Luis Obispo Lines: 3 Message-ID: NNTP-Posting-User: ceustaqu@farad.elee.calpoly.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Who still carries these? I would like to buy some for replacing some broken one on my Ranger/Invader/Valiant. I appreciate any assistance on this. 73's. Cal. From lwbyppp@epix.net Mon Feb 05 21:32:21 1996 Path: news.epix.net!news.sprintlink.net!guitar.sound.net!news.sprintlink.net!usit.net!arcade-slip21.dynamic.usit.net!user From: kaboom@usit.net (Michael) Newsgroups: rec.radio.amateur.homebrew Subject: Help: MS230 Mini o'scope Date: 28 Jan 1996 05:20:13 GMT Organization: United States Internet, Inc. Lines: 19 Message-ID: NNTP-Posting-Host: 199.1.54.37 I just acquired a Non-Linear Systems MS230 mini oscilloscope at a hamfest. The thing works, but it has an oddity I can't figure out. With the trigger set to "internal," everything works as it should. Of course, the trace goes out when the trigger is not locked. (It's supposed to do that.) When I set it to "auto," it free-runs, as it should. But, then it will not sync to a signal at all... it just continues to free-run, making the auto function useless. On all other scopes I've ever used, auto will make it free-run when unlocked, and then it reverts to a locked condition when the trigger syncs to the signal. I went through the scope and tested and/or swapped out just about every semiconductor in it (luckily, the ICs are in sockets, and are common CMOS). Nothing helps. Poking around with my other scope turned up nothing, either. Anybody have one of these things? Is it possible it was designed that way? Anybody have a schematic for it? Please reply via email, and thanks for any help you can give me. For that matter, is NLS still in business? Michael From lwbyppp@epix.net Mon Feb 05 21:32:23 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!visi.com!news3.mr.net!mr.net!chi-news.cic.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!microvst.demon.co.uk From: "Anthony R. Gold" Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: 82 Repeater in Kansas City Date: Sun, 28 Jan 96 17:22:55 GMT Organization: Microvest Limited, London Lines: 19 Message-ID: <822849775snz@microvst.demon.co.uk> References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> Reply-To: tgold@microvst.demon.co.uk X-NNTP-Posting-Host: microvst.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 X-Mail2News-Path: microvst.demon.co.uk Xref: news.epix.net rec.radio.amateur.policy:32944 rec.radio.amateur.antenna:18812 rec.radio.amateur.equipment:24433 rec.radio.amateur.homebrew:13071 rec.radio.amateur.digital.misc:13903 In article <310B8C36.5D9@magnum.wpe.com> caffraye@magnum.wpe.com "Eddie Caffray" writes: > On the 146.85 repeater here in Central NY we had trouble with one user > also. He made it that no one would even monitor the reapeater anymore. The > club voted to ban him and we did. The reapeater is a great place to be > again. That's a weird story. The jerk behaves badly enough to be banned but is obedient enough to obey your request that he voluntarily not transmit on the legally licensed (input) frequency. Were there some strong words of `encouragement' that went with the banning? Regards, -- Tony - G3SKR / AA2PM email: tgold@panix.com tgold@microvst.demon.co.uk packet: g3skr@n0ary.#nocal.ca.usa.na From lwbyppp@epix.net Mon Feb 05 21:32:24 1996 Path: news.epix.net!news.sprintlink.net!HiWAAY.net!imci2!news.internetMCI.com!darwin.sura.net!gaia.ns.utk.edu!usenet From: Mark Mansfield Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Looking for mechanical filters. Date: Sun, 28 Jan 1996 21:04:34 -0600 Organization: Univ. of Tenn at Martin Lines: 16 Message-ID: <310C3942.40B4@UTM.Edu> NNTP-Posting-Host: dialup08.utm.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win95; I) CC: markman@utm.edu Xref: news.epix.net rec.radio.amateur.homebrew:13066 rec.radio.swap:56515 I'm looking for a pair of Collins (or equiv.) mechanical filters for a CW receiver which I'm building. I'm planning on using one of the filters in the front of the IF and using another in the "tail-ended" mode after the last IF amp. The filters should be the same frequency with the tail- ended filter 100 to 200 hertz wider than the first filter (this was recommended in a book by Doug DeMaw although the same bandwidth should work as well if the filters have the same frequency). If you have any of these critters, drop me a note with specifics such as part number, bandwidth and price. I would also like to hear from anyone else that has used this technique in a home built receiver. Thanks, Mark From lwbyppp@epix.net Mon Feb 05 21:32:25 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!lynx.unm.edu!bubba.NMSU.Edu!not-for-mail From: beard@acca.nmsu.edu (beard) Newsgroups: rec.radio.amateur.homebrew Subject: Books for Sale Date: 29 Jan 1996 06:22:45 GMT Organization: New Mexico State University Lines: 11 Message-ID: <4ehp3l$5sm@bubba.NMSU.Edu> NNTP-Posting-Host: acca.nmsu.edu X-Newsreader: TIN [UNIX 1.3 950621BETA PL0] Hints and Kinks for the Radio Amateur Solid State Design for the Radio Amateur Solid State basics for the Radio Amateur I do very little of this type of thing now. If you want them they are yours for $1.00 each I'd rather you take all three for $3.00 + postage. David Beard WA4QGA From lwbyppp@epix.net Mon Feb 05 21:32:26 1996 Newsgroups: rec.antiques.radio+phono,rec.radio.amateur.homebrew,rec.radio.swap Path: news.epix.net!uunet!in2.uu.net!xenitec!nic.wat.hookup.net!noc.tor.hookup.net!baton.com!nobody From: wjohnson@baton.com (Wayne Johnson) Subject: Re: Eddystone receiver 4 sale Message-ID: Sender: nobody@gateway.baton.com Organization: Baton Broadcasting Date: Mon, 29 Jan 1996 14:42:20 GMT References: <3posdv$mml$1@mhade.production.compuserve.com> X-Newsreader: Forte Free Agent 1.0.82 Lines: 20 Xref: news.epix.net rec.antiques.radio+phono:15572 rec.radio.amateur.homebrew:13122 rec.radio.swap:56749 Old Man <70401.134@CompuServe.COM> wrote: >Eddystone 830/7 receiver in excellent condition. A few scratches >but very nice. Have a full set of spare tubes and manual. >This model last tube receiver made by Eddystone. Rare here in >USA. $600 OBO plus shipping. >Sandy W5TVW I subscribed to this newsgroup for the first time on Friday, and yours was the first post I read. I went home on the weekend and dusted off my Eddystone S750/1 which had been in storage for about 15 years, plugged it in and it still works like a charm. It's in excellent condition and includes the matching external speaker. Can anyone tell me anything about it's history, rarity, current value, etc.? Thanks Wayne Johnson Sudbury, Ontario From lwbyppp@epix.net Mon Feb 05 21:32:27 1996 Path: news.epix.net!uunet!in1.uu.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!usenet From: QRP%mimi@magic.itg.ti.com (D W Hemphill KC5NG) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Baked Black Wrinkle Paint Date: 29 Jan 1996 16:43:26 GMT Lines: 25 Message-ID: <4eitfe$g4n@mksrv1.dseg.ti.com> References: <4edu72$k5e@dub-news-svc-2.compuserve.com> NNTP-Posting-Host: dhemphill.dseg.ti.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 In article <4edu72$k5e@dub-news-svc-2.compuserve.com>, 73447.325@compuserve.com says... > > >I'm looking for someone to replaint a small metal base in its original, bla >ck wrinkle >color and finish. Anyone out there that can help? > >-Paul, N9AZ You can do this yourself, and get great results! The paint is sold at auto parts stores in spray cans. I use it frequently to paint radio cabinets and such. Baking isn't necessary if you wait 'til the summer and let the painted item sit in the hot sun for a few hours (works well in 100 degree Texas heat!). Much of the time, I don't even strip off the old paint, because the wrinkle finish is thick enough and coarse enough to hide imperfections in the old base coat. Be sure to read the directions on the spray can! Good luck! 73 de KC5NG From lwbyppp@epix.net Mon Feb 05 21:32:29 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!uunet!in1.uu.net!despina.neptune.com!news.jsums.edu!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: WD-40 vice Contact/Tuner Spray!! Message-ID: <1996Jan29.164551.13916@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4e6tbm$hdv@whidbey.whidbey.com> <4e9a5d$c08@i-2000.com> <1996Jan28.204639.8744@ke4zv.atl.ga.us> <4eiks1$l4a@pacific.mps.ohio-state.edu> Date: Mon, 29 Jan 1996 16:45:51 GMT Lines: 55 In article <4eiks1$l4a@pacific.mps.ohio-state.edu> James Garland writes: >The suggestion to soak dirty rigs in warm water with bubble bath raises a >question I've wondered about for years. I recall reading a Tektronix >service note years ago, in which dirty Tek scopes were washed out with >warm soapy water, rinsed, and air dried at a warm (100 degree) temp for a >day or so. If I recall correctly (I read this about 30 years ago), the >xfmrs were removed, and afterwards the paper caps were replaced, and >switches lubricated. > >I've never had the nerve to try this technique. I just can't bring >myself to dunk, say, my Central Electronics 100V in the bathtub and let >it soak. I'd be interested in knowing others' experience with this >cleaning method. Is it really necessary to remove the transformers? What >happens to the cardboard sleeves of IF transformers? Does it hopeless >ruin paper capacitors? Are there other precautions to take? Paper components can be a problem. They swell when wet, and won't go back to their original dimensions when dried. If the paper wrap of a power transformer is well varnished, it may not swell, but there is a risk. Paper capacitors, and electrolytic capacitors with paper sleeves, will be ruined. The tuning scales on some old radios are paper based, and they can be ruined too unless they are heavily oiled or waxed. The bubble bath method works well on modern equipment, which has little or no paper components, and warm water is about the only thing that's effective if salt water has been in the equipment, because you've *got* to get all the salt out or you'll have continuing corrosion problems, and besides, the salt water would have ruined any paper components anyway. I've put old WWII equipment in the dishwasher. Dishwasher detergent is really harsh, but boy does it clean well. You're going to have to replace the old paper capacitors in that equipment anyway, just due to age, so that's not much of a concern. And the hot water will soften or remove wax that may be used to seal adjustable coils, but the rig will probably need an alignment anyway, so that's not a big concern either. But the dishwasher detergent can etch aluminum, and aluminum parts can come out frosted instead of shiny, so you might think about that before pitching that old radio in the dishwasher. Any bare aluminum parts that will show should probably be removed. Painted or anodized aluminum is Ok to put in the dishwasher. Steel parts will do fine too, just don't use the dry cycle. There's heat and humidity during the dry cycle that'll rust bare steel for sure. Take the radio out after the wash cycle, blow out all the water you can, and leave the radio in a warm low humidity place overnight to finish drying (a very slightly warm oven can be used to hasten the process, but don't overdo the heat). Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Mon Feb 05 21:32:31 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!news.bu.edu!transfer.stratus.com!news3.near.net!yale!news-mail-gateway!daemon From: schiller@mv.us.adobe.com (Steve Schiller) Newsgroups: rec.radio.amateur.homebrew Subject: WTB: GR874 to type N cable or adapters Date: 29 Jan 1996 17:13:54 -0500 Organization: Yale CS Mail/News Gateway Lines: 13 Sender: daemon@cs.yale.edu Message-ID: <199601292208.OAA01745@missal.mv.us.adobe.com> NNTP-Posting-Host: babyblue.cs.yale.edu Hi, I am in the market for three GR874 to type N or SMA (preferably male) cables. 50 ohm. Any length from 6" to 2'. These cost about $64 each new (from Pasternack Enterprises), so I am looking for something considerably cheaper. In addition I need one GR874 to BNC adapter. I might not be reading e-mail again until Feb 5, but you can reach me by phone at (510) 581-3792 from 10am to 11pm PST. thanks, - Steve From lwbyppp@epix.net Mon Feb 05 21:32:31 1996 Path: news.epix.net!uunet!in2.uu.net!kiwi.crown.net!usenet From: jessica Newsgroups: rec.radio.amateur.homebrew Subject: ham software wanted Date: 29 Jan 1996 17:19:13 GMT Organization: Crown Net Inc. Lines: 6 Distribution: world Message-ID: <4eivih$d9v@kiwi.crown.net> NNTP-Posting-Host: crown12.crown.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) hi name is toby call is n9fdf. i new to the www. i would like to know where i can find a good place to donwload some ham software here on the net... 73 From lwbyppp@epix.net Mon Feb 05 21:32:33 1996 Path: news.epix.net!news.sprintlink.net!nntp.inc.net!novia!news.dpc.net!news.heurikon.com!uwvax!frankensun.altair.com!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.bctel.net!news.island.net!ham!rs From: rs@ham.island.net (Robert Smits) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WD-40 vice Contact/Tuner Spray!! Message-ID: <012996190937Rnf0.79b6@ham.island.net> Date: Mon, 29 Jan 1996 19:09:00 PST References: <4e6tbm$hdv@whidbey.whidbey.com> <4e9a5d$c08@i-2000.com> <1996Jan28.204639.8744@ke4zv.atl.ga.us> <4eiks1$l4a@pacific.mps.ohio-state.edu> Reply-To: rs@ham.island.net Distribution: world Organization: The Curmudgeon's Cottage X-Newsreader: Rnf 0.79b6 Lines: 35 James Garland writes: >The suggestion to soak dirty rigs in warm water with bubble bath raises a >question I've wondered about for years. I recall reading a Tektronix >service note years ago, in which dirty Tek scopes were washed out with >warm soapy water, rinsed, and air dried at a warm (100 degree) temp for a >day or so. If I recall correctly (I read this about 30 years ago), the >xfmrs were removed, and afterwards the paper caps were replaced, and >switches lubricated. > >I've never had the nerve to try this technique. I just can't bring >myself to dunk, say, my Central Electronics 100V in the bathtub and let >it soak. I'd be interested in knowing others' experience with this >cleaning method. Is it really necessary to remove the transformers? What >happens to the cardboard sleeves of IF transformers? Does it hopeless >ruin paper capacitors? Are there other precautions to take? Never tried it with a scope. I have tried it with an 8 track tape player (in their heyday) whose owner had tried to improve the grip of the rubber belt drive by liberally smearing it with honey. Naturally, it crystallized into a very hard lump. I soaked it for several hours, shook all the water off, and let it air dry in a stream of warm air from a nearby cooling fan for several days. After relubrication and a new belt, it was fine. I'd only do this if there was no other way to clean it, and removing the transformers is certainly advisable on AC equipment. Bob, VE7HS -- rs@ham.island.net In the first place God made idiots; this was for practice; then he made school boards - Mark Twain From lwbyppp@epix.net Mon Feb 05 21:32:34 1996 Path: news.epix.net!uunet!in1.uu.net!tank.news.pipex.net!pipex!demon!sunsite.doc.ic.ac.uk!yama.mcc.ac.uk!io.salford.ac.uk!aber!bath.ac.uk!morse.ukonline.co.uk!ukonline.co.uk!david.j2 From: David Johnson Newsgroups: rec.radio.amateur.homebrew Subject: JVFAX pcb layout ??? Date: Mon, 29 Jan 1996 19:31:15 +0000 Organization: (NON) Lines: 8 Distribution: world Message-ID: NNTP-Posting-Host: lon3-1.ukonline.co.uk Mime-Version: 1.0 X-Newsreader: Turnpike Version 1.11 Hi All, Does anyone have a pcb layout for the AM/FM JVfax interface? That's the one with the LTC1099 i/c on it. Thanks in advance David Johnson G4AON, e-mail to david.j2@ukonline.co.uk From lwbyppp@epix.net Mon Feb 05 21:32:35 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!paladin.american.edu!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: License Exams Date: 29 Jan 96 22:29:33 GMT Organization: ucsd usenet gateway Lines: 13 Message-ID: <9600298229.AA822962346@mails.imed.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Does anyone know of any license exam sessions in the Houston or southeast Texas area in the immediate future? I have my code speed up and I want to get to a test before I loose it again. The closest one I know of is Victoria on March 9. I'd rather not wait that long! Thanks. Ray Mack WD5IFS mack@mails.imed.com From lwbyppp@epix.net Mon Feb 05 21:32:36 1996 Path: news.epix.net!uunet!in2.uu.net!nntp.coast.net!news.sprintlink.net!news.interserf.net!usenet From: Mike Sims Newsgroups: rec.radio.amateur.homebrew Subject: 4CX1600B Amp. Date: Mon, 29 Jan 1996 22:58:51 -0500 Organization: Internet Services Of Fredericksburg Lines: 8 Message-ID: <310D977B.3E3E@interserf.net> NNTP-Posting-Host: nasfred.interserf.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (Win95; I) Just about finished building a 4CX1600B, 80 - 10 meter amp. using the informat ion from the Svetlana Specification Sheet and 4CX1600B amp. article of Marv Gonsior, W6FR, in the Winter 1995 edition of Communications Quarterly. Looking for suggestions, warnings, cauti ons, etc. regarding what I should lookout for the first time the 4CX1600B amp. is turned on or bef ore it is turned on. 73s, Mike Sims, K4GMH From lwbyppp@epix.net Mon Feb 05 21:32:37 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!news.ifu.net!ifu From: n2tnn@ifu.net (Dean N2TNN) Newsgroups: rec.radio.amateur.homebrew Subject: QRP Kits Date: 30 Jan 1996 00:30:56 GMT Organization: ifu.net Lines: 8 Message-ID: <4ejos0$lgp@news.ifu.net> NNTP-Posting-Host: ip62.ifu.net X-Newsreader: News Xpress Version 1.0 Beta #4 Any comments on qrp kits? I have constructed Ark40 and have a NorCal40 in the box. I was just looking for any comments to help justify buying another. 30 Meters is in desperate need of my tiny qrp signal but I don't know how to get it there. BTW, how abt the QRP Plus??? 72 Dean From lwbyppp@epix.net Mon Feb 05 21:32:38 1996 Path: news.epix.net!news.sprintlink.net!news.ecrc.de!news.space.net!news.muc.de!informatik.tu-muenchen.de!Germany.EU.net!howland.reston.ans.net!newsfeed.internetmci.com!news1.i1.net!news1.inlink.com!usenet From: raiar@inlink.com (Gary V. Deutschmann, Sr.) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Baked Black Wrinkle Paint Date: Tue, 30 Jan 1996 03:28:40 GMT Organization: Inlink Lines: 9 Message-ID: <4ek3jv$mon@news1.inlink.com> References: <4edu72$k5e@dub-news-svc-2.compuserve.com> NNTP-Posting-Host: slip108.inlink.com X-Newsreader: Forte Free Agent 1.0.82 Hi Paul Both J.C. Whitney and Warshowski & Co. Automotive suppliers in Chicago sell wrinkle finish paint in aerosols. TTUL Gary From lwbyppp@epix.net Mon Feb 05 21:32:39 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Swan XTAL Filter Impedance ? Date: 30 Jan 1996 03:31:47 GMT Organization: Hewlett-Packard Lines: 20 Message-ID: <4ek3f3$sou@hpscit.sc.hp.com> References: <4eals2$b51g@rs2.ccd.harris.com> NNTP-Posting-Host: hpscrj.scd.hp.com In article <4eals2$b51g@rs2.ccd.harris.com>, Doug Snowden wrote: >I found an old Swan xtal filter the other day. I'd like to play around >with it in a receiver circuit. It is a 487-024 freq = 9001.65 khz. I >think I came from an old Swan Astro 100 transceiver. What is the in/out >impedance ? Guess I could play until I got it matched if all else fails. > >Doug, N4IJ >-- >Doug Snowden >dsnowden@ccd.harris.com > It's probably in the neighborhood of 5000 ohms, if you want a starting point for experimenting. They typically require a few pF. (may be negative or positive) of shunt capacitance as well. Be sure to have 2 adjustments on each port, so you can do both R and C. Rick Karlquist N6RK rkarlqu@scd.hp.com From lwbyppp@epix.net Mon Feb 05 21:32:40 1996 Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!gatech!purdue!haven.umd.edu!news.ums.edu!crick.sura.net!thorn.cc.usm.edu!whale.st.usm.edu!tratliff From: tratliff@whale.st.usm.edu (Tina Marie Hatten Ratliff) Newsgroups: rec.radio.amateur.homebrew Subject: QSL Bureau in Egypt? Date: 30 Jan 1996 07:09:51 GMT Organization: University of Southern Mississippi Lines: 12 Message-ID: <4ekg7v$eia@thorn.cc.usm.edu> NNTP-Posting-Host: whale.st.usm.edu X-Newsreader: TIN [version 1.2 PL1] I am posting this for a friend living in Egypt so please forgive me if this is the wrong newsgroup. My friend wants to obtain an Eyptian radio license and needs a contact person. Does anyone have the address for the QSL bureau or the addresses of licensed operators in Egypt. Please respond to me at CACHS100@AUC-ACS.EUN.EG THANK YOU VERY MUCH, JEFF RATLIFF From lwbyppp@epix.net Mon Feb 05 21:32:41 1996 Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!EU.net!sun4nl!rnzll3!sys3.pe1chl!rob From: rob@pe1chl.ampr.org (Rob Janssen) Subject: Re: 82 Repeater in Kansas City Reply-To: pe1chl@wab-tis.rabobank.nl Organization: PE1CHL Message-ID: References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> Date: Tue, 30 Jan 1996 09:24:14 GMT Lines: 17 Xref: news.epix.net rec.radio.amateur.policy:33008 rec.radio.amateur.antenna:18907 rec.radio.amateur.equipment:24595 rec.radio.amateur.homebrew:13149 rec.radio.amateur.digital.misc:13973 In <310B8C36.5D9@magnum.wpe.com> Eddie Caffray write s: > On the 146.85 repeater here in Central NY we had trouble with one user also. He made it that >no one would even monitor the reapeater anymore. The club voted to ban him an d we did. The >reapeater is a great place to be again. How do you manage to effectively ban malicious users from a repeater? Of course this problem is known all over the world, but at least over here we have not yet found an effective way of stopping them. How do you do that? Rob -- +------------------------------------+--------------------------------------+ | Rob Janssen rob@knoware.nl | BBS: +31-302870036 (2300-0730 local) | | AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU | +------------------------------------+--------------------------------------+ From lwbyppp@epix.net Mon Feb 05 21:32:42 1996 Path: news.epix.net!news.sprintlink.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!in2.uu.net!nntp.news.primenet.com!news.primenet.com!news.primenet.com!not-for-mail From: sparkfel@primenet.com (Mark Fellhauer) Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: 82 Repeater in Kansas City/Repeater Use Date: 30 Jan 1996 09:26:00 -0700 Organization: Primenet Services for the Internet Lines: 43 Sender: root@primenet.com Message-ID: <4elgqo$q73@nnrp1.news.primenet.com> References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> X-Posted-By: ip200.phx.primenet.com X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.amateur.policy:32923 rec.radio.amateur.antenna:18785 rec.radio.amateur.equipment:24394 rec.radio.amateur.homebrew:13052 rec.radio.amateur.digital.misc:13884 rob@pe1chl.ampr.org (Rob Janssen) wrote: >In <310B8C36.5D9@magnum.wpe.com> Eddie Caffray writ es: >> On the 146.85 repeater here in Central NY we had trouble with one user also . He made it that >>no one would even monitor the reapeater anymore. The club voted to ban him a nd we did. The >>reapeater is a great place to be again. >How do you manage to effectively ban malicious users from a repeater? >Of course this problem is known all over the world, but at least over >here we have not yet found an effective way of stopping them. How do >you do that? Go to the Arizona Repeater Association's Home Page to see how this is done. It involves actively pursuing people who engage in such activity. The ARA, as a matter of routine, has an interference committee dedicated to tracking these people down. Despite reports to the contrary, the FCC does frown on this activity, and will enforce sanctions. Just ask the people here in Phoenix about that. An NAL, Notice of Apparant Liability, carries a stiff monetary fine, about $20,000 (US) worth and forfeiture of ALL broadcasting equipment and license(s). It has been reported to me, by Dan Ford, Commander of the SHERRIF'S Ham Radio Posse, that they also plan to actively engage in pursuing people misusing radio gear in Maricopa County. I strongly suggest that if you plan on jamming a repeater in Central Arizona, plan on getting caught. Unfortunately, the ARA has had, for the 3rd time its existence, had to remove a member, by board action, for misconduct involving repeaters. This "gentleman" is also facing stiff legal sanctions from the FCC. In 1995, the 3 biggest abusers of ARA repeaters WERE caught, and several others have been identified. 73, Mark Fellhauer KC7BXS From lwbyppp@epix.net Mon Feb 05 21:32:44 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!ifwtech.demon.co.uk!G3SEK From: "Ian White, G3SEK" Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Re: Looking for mechanical filters. Date: Tue, 30 Jan 1996 13:42:24 +0000 Organization: IFW Technical Services Lines: 64 Distribution: world Message-ID: <$GoHIDAABiDxEwi3@ifwtech.demon.co.uk> References: <310C3942.40B4@UTM.Edu> NNTP-Posting-Host: ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL> Xref: news.epix.net rec.radio.amateur.homebrew:13155 rec.radio.swap:56866 In article , Wes Stewart wrote: >In article <310C3942.40B4@UTM.Edu> Mark Mansfield writes: >>From: Mark Mansfield >>I'm looking for a pair of Collins (or equiv.) mechanical filters for a >>CW receiver which I'm building. I'm planning on using one of the filters >>in the front of the IF and using another in the "tail-ended" mode after >>the last IF amp. The filters should be the same frequency with the tail- >>ended filter 100 to 200 hertz wider than the first filter (this was >>recommended in a book by Doug DeMaw although the same bandwidth should >>work as well if the filters have the same frequency). > > >Haven't used Collins filters but have used 9 MHz KVGs in this application. >(XF9B input, XF9A output) I know there is a theoretical advantage to having >the second filter, but I didn't note much improvement in my HB receiver. Ther e >can be a complication in the AGC system though. After conversation with Wes >Haywood, I decided to move the AGC pickoff ahead of the second filter. The >time delay through the second filter was causing severe AGC pumping. See >KN5S's article in a recent QEX for more on this. > >Assuming no i-f overload and a decent product detector, you basically suffer >no more than 3 dB extra noise at the audio amp without the second filter. Of >course if the first filter has poor stopband rejection or there is leakage >around it, the second filter can help. Too much broadband IF gain can deliver enough noise power to overload the product detector and cause unwanted (>2nd-order) intermodulation. The effect is that additional noise becomes mixed with the signal, degrading the SNR way beyond the expected 3dB. This is a similar effect to the one mentioned some weeks ago in the discussion about measuring filter performance using a broadband high- power noise source and a spectrum analyzer. Except when limited by a narrow bandpass filter, the total integrated noise power overloads the analyzer so that the filter stopband fills up again with intermodulated noise. In an IF amplifier, even a very moderate amount of post-filter selectivity (simple tuned circuits) is usually enough to chop down the broadband noise from the earlier stages. This makes a big improvement to the SNR without introducing delays which could affect the AGC. In other words, you can have the best of both worlds without the expense of a second mechanical or xtal filter. Bring back IF transformers! > >Good luck, > >Wes -- N7WS > >>Thanks, >>Mark > 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From lwbyppp@epix.net Mon Feb 05 21:32:46 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!saluki-news.wham.siu.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!cdc2.cdc.net!uunet!in1.uu.net!hearye.mlb.semi.harris.com!babylon5.ccd.harris.com!not-for-email From: dsnowden@ccd.harris.com (Doug Snowden) Newsgroups: rec.radio.amateur.homebrew Subject: Need MC1648P I.C. Date: 30 Jan 1996 14:38:57 -0500 Organization: Harris Controls Division Lines: 10 Message-ID: <4els4h$c2uj@rs2.ccd.harris.com> NNTP-Posting-Host: rs2.ccd.harris.com X-Newsreader: TIN [version 1.2 PL2] I need 2 or more of these. Anyone know where I can get small quantities of these - some place without a minimum order? These are 16 pin DIP VCO s. Doug, N4IJ dsnowden@ccd.harris.com -- Doug Snowden dsnowden@ccd.harris.com From lwbyppp@epix.net Mon Feb 05 21:32:47 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!chi-news.cic.net!ddsw1!news.mcs.net!in-news.erinet.com!bug.rahul.net!a2i!rahul.net!a2i!news.clark.net!starport!brian.carling Distribution: world Newsgroups: rec.radio.amateur.homebrew From: brian.carling@acenet.com (Brian Carling) References: <1996Jan29.164551.13916@ke4zv.atl.ga.us> Date: Tue, 30 Jan 1996 16:00:00 -0500 Organization: =ACE= ONLINE (301)942-2218 Subject: Re: WD-40 vice Contact/Tu Message-ID: <2a6.8072.546@acenet.com> Lines: 12 GC>I've put old WWII equipment in the dishwasher. Dishwasher detergent GC>is really harsh, but boy does it clean well. You're going to have GC>to replace the old paper capacitors in that equipment anyway, just GC>due to age, so that's not much of a concern. And the hot water will GC>soften or remove wax that may be used to seal adjustable coils, but GC>the rig will probably need an alignment anyway, so that's not a big GC>concern either. But the dishwasher detergent can etch aluminum, and GC>aluminum parts can come out frosted instead of shiny, so you might Plays havoc with loudspeakers too! --- þ SLMR 2.1a þ From lwbyppp@epix.net Mon Feb 05 21:32:48 1996 Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!primus.ac.net!news.serv.net!news.alt.net!news1.alt.net!news.u.washington.edu!news.uoregon.edu!chi-news.cic.net!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!lerc.nasa.gov!grybicki.lerc.nasa.gov!seryb From: George Rybicki Newsgroups: rec.radio.amateur.homebrew Subject: yaesu ft101 mods? Date: 30 Jan 1996 18:05:33 GMT Organization: PV Branch Lines: 4 Distribution: world Message-ID: <4elmld$9bj@sulawesi.lerc.nasa.gov> NNTP-Posting-Host: grybicki.lerc.nasa.gov X-Newsreader: Nuntius Version 1.2 X-XXMessage-ID: X-XXDate: Wed, 31 Jan 1996 18:09:03 GMT Does anyone know about the WARC band mods for the FT101, I found the 30 meter mod and a reference to the 12 meter mod. What is the 12 meter mod? how is it done? thanks in advance for any help. 73 George From lwbyppp@epix.net Mon Feb 05 21:32:49 1996 Path: news.epix.net!news.sprintlink.net!news.ecrc.de!news.space.net!news.muc.de!informatik.tu-muenchen.de!Germany.EU.net!howland.reston.ans.net!newsfeed.internetmci.com!gatech!news-feed-1.peachnet.edu!hobbes.cc.uga.edu!news From: ignacy@num.ads.uga.edu (Ignacy Misztal) Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Re: Looking for mechanical filters. Date: 30 Jan 1996 18:32:26 GMT Organization: University of Georgia Lines: 23 Distribution: world Message-ID: <4elo7q$7ih@hobbes.cc.uga.edu> References: <310C3942.40B4@UTM.Edu> <$GoHIDAABiDxEwi3@ifwtech.demon.co.uk> Reply-To: ignacy@uga.cc.uga.edu (Ignacy Misztal) NNTP-Posting-Host: num.ads.uga.edu X-Newsreader: IBM NewsReader/2 v1.00 Xref: news.epix.net rec.radio.amateur.homebrew:13141 rec.radio.swap:56824 In <$GoHIDAABiDxEwi3@ifwtech.demon.co.uk>, "Ian White, G3SEK" writes: > >In an IF amplifier, even a very moderate amount of post-filter >selectivity (simple tuned circuits) is usually enough to chop down the >broadband noise from the earlier stages. This makes a big improvement to >the SNR without introducing delays which could affect the AGC. In other >words, you can have the best of both worlds without the expense of a >second mechanical or xtal filter. > The second filter eliminates noise from the other sideband (thus the 3db improvement) and eliminates the hiss. One can see a diffrence it makes when one compares CW reception with 1st IF with 2nd IF filters. Disregarding differences in slopes, the 2nd IF filter cuts the hiss and makes the signal sound more "professional". One can have a similar effect with a DSP, but good DSPs are not cheaper than the 2nd IF filter and the 3db advanatage is lost. Ignacy Misztal Ham radio: NO9E, SP8FWB E-mail: ignacy@uga.cc.uga.edu University Of Georgia, 203 L-P Bldg., Athens, GA 30602 tel. (706) 542-0951 From lwbyppp@epix.net Mon Feb 05 21:32:50 1996 Path: news.epix.net!news.sprintlink.net!news.scott.net!acara.snsnet.net!news5.crl.com!nntp.crl.com!howland.reston.ans.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!amden.demon.co.uk From: Keith Beddoe Newsgroups: rec.radio.amateur.homebrew Subject: Re: HELP Interference Date: Tue, 30 Jan 96 21:11:45 GMT Lines: 44 Message-ID: <9601302111.AA000o3@amden.demon.co.uk> References: <4el9nf$h@ns2.ptd.net> X-NNTP-Posting-Host: amden.demon.co.uk X-Newsreader: TIN [AMIGA 1.3 950726BETA PL0] X-Mail2News-Path: relay-4.mail.demon.net!post.demon.co.uk!amden.demon.co.uk George (georgef@postoffice.ptd.net) wrote: : I'm trying to use my AEAfax to receive FAX/RTTY. But My computer : generates too much interfercne. I know its not the : electrical system ground. I'm thinking of running a ground wire from : second floor wind and driving a rod in the ground. Will this help? I : know nothing about grounding. I had similar problems some years back using a homebrew computer. What I did was to use a noise-cancelling circuit. What I did was to erect a short aerial next to the offending equipment and connect this to one end of a loop. Then connect the main aerial to the other. By using a potential divider and variable capacitor I could use the noise picked up on the short aerial to cancel out the noise being picked up on the main aerial. ---|-----########---------- short | 1:1 main aerial | ######## aerial | | | | | | | RX 1000 ohm R C R C R C 200pf Variable R and C in parallel | | Ground or nearest copper water pipe! I hope the 'diagram' is clear. By careful adjustment of R and C it was possible to "phase" out most of the noise. The circuit did need adjustment if large changes in frequency were made. This circuit was also helpful in reducing TV Timebase interference on 160m. Hope this is of interest. 73 Keith G3YOM Southampton UK From lwbyppp@epix.net Mon Feb 05 21:32:51 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: alex948739@aol.com (Alex948739) Newsgroups: rec.radio.amateur.homebrew Subject: HELP WITH SELECTING FIRST HANHELD HAM Date: 30 Jan 1996 21:15:15 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 5 Sender: root@newsbf02.news.aol.com Message-ID: <4emjbj$sa5@newsbf02.news.aol.com> Reply-To: alex948739@aol.com (Alex948739) NNTP-Posting-Host: newsbf02.mail.aol.com HI, I JUST GOT MY LICENCE AND I WANT TO BUY A HANDHELD HAM RADIO BECAUSE I AM ALWAYS TRAVELING. CAN ANYONE HAVE ANY SUGGESTIONS? I WANT IT TO BE MODIFYABLE AND I WANT TO TALK TO PEOPLE IN RUSSIA. PLEASE INCLUDE THE PRICE ALONG WITH THE MODEL NUMBERS. THANK YOU From lwbyppp@epix.net Mon Feb 05 21:32:52 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr1ip8.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Re: Looking for mechanical filters. Date: Tue, 30 Jan 1996 22:01:32 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 42 Distribution: world Message-ID: References: <310C3942.40B4@UTM.Edu> <$GoHIDAABiDxEwi3@ifwtech.demon.co.uk> <4elo7q$7ih@hobbes.cc.uga.edu> NNTP-Posting-Host: usr1ip8.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] Xref: news.epix.net rec.radio.amateur.homebrew:13036 rec.radio.swap:56382 In article <4elo7q$7ih@hobbes.cc.uga.edu> ignacy@num.ads.uga.edu (Ignacy Miszt al) writes: >From: ignacy@num.ads.uga.edu (Ignacy Misztal) >Subject: Re: Looking for mechanical filters. >Date: 30 Jan 1996 18:32:26 GMT >In <$GoHIDAABiDxEwi3@ifwtech.demon.co.uk>, "Ian White, G3SEK" > writes: >> >>In an IF amplifier, even a very moderate amount of post-filter >>selectivity (simple tuned circuits) is usually enough to chop down the >>broadband noise from the earlier stages. This makes a big improvement to >>the SNR without introducing delays which could affect the AGC. In other >>words, you can have the best of both worlds without the expense of a >>second mechanical or xtal filter. >> >The second filter eliminates noise from the other sideband (thus >the 3db improvement) and eliminates the hiss. One can see a diffrence >it makes when one compares CW reception with 1st IF with 2nd IF >filters. Disregarding differences in slopes, the 2nd IF filter cuts >the hiss and makes the signal sound more "professional". One can have >a similar effect with a DSP, but good DSPs are not cheaper than >the 2nd IF filter and the 3db advanatage is lost. I agree with Ian. In my previous post, I neglected to mention the assumption that the i-f strip included some moderate tuned-circuit selectivity. As to the reduction of hiss (over and above the image sideband noise) I fail to see an advantage to the second filter, give my earlier assumptions. The product detector is just another mixer which can be followed with an audio BP filter (doesn't have to be DSP) to achieve the same BW reduction as the second mechanical or crystal filter. In other words, except for the fold over of the image sideband, you can't tell the difference. As to audio DSP, I must confess to being underwhelmed with my DSP-9. I consistently find that I'm using the 1.8 KHz BW even on EME strength CW. A trained ear is still a lot better (IMHO) than a box full of electronics. In the absence of QRM, I just don't see the necessity for "brick-wall" filters. A couple of synchronously-tuned passive LC circuits and a good pair of hi-fi phones work fine. No power supply, no hum, no hiss, no crossover distortion, no cost:-) Wes -- N7WS From lwbyppp@epix.net Mon Feb 05 21:32:54 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: PTO Temperature Compensation Date: Tue, 30 Jan 96 22:30:26 GMT Lines: 59 Message-ID: <823084973.2216@pinetree.microserve.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 I have four identical PTO's in solid-state rigs that I've been trying to stabilize, with only limited success. Maybe someone with more experience in this area can help me out. First, the oscillator is a JFET in the usual Colpitts configuration, operating from 5.0-5.5 MHz. From the factory, the two feedback capacitors are each 91 pf silver micas. The inductor is paralleled with approximately 140 pf. The latter is composed of three separate disc capacitors, ranging from N220 to N330 types. The problem I have with the PTO's is that they all drift upward as the temperature rises. Following a ten or fifteen minute warmup, I tracked the drift over a five or six hour period as the chassis of the rig(s) gradually warmed up. The first PTO (which probably had a bad component) would drift about 1.6 KHz. The second PTO drifted about 800 Hz, and the last two units both drifted about 300-400 Hz. I decided to tackle the worst ones first, and I began by replacing the oscillator transistors with MPF102's. This helped considerably. Next, following many, many hours of trial and error, I ended up replacing the silver micas with 100 pf polystyrene capacitors, and the remaining three compensation capacitors also with polystyrene units. Now the first two PTO's drift upward almost an identical amount, about 200-300 Hz during the same warmup period. This may not sound like much, but the problem is that when the rig is used to transmit, chassis temperature quickly rises another 10 or 15 degrees. This causes another drift to take place during the first hour or so of a QSO, and the drift amounts to approximately 200-300 Hz. This occurs in addition to the longer-term warmup drift, and it takes place no matter how long the rig is powered on prior to the QSO. One of the things that seems odd about this has to do with the capacitors I tried. First, as I gradually replaced the N220 and N330 capacitors with polystyrene units, the upward drift diminished. This has made me think that the PTO's were, in fact, over-compensated. Now, it's my understanding that polystyrene capacitors also exhibit a negative temperature coefficient, and that the coefficient is not particularly well controlled. Mallory states pretty wide variations for their capacitors, ranging from about -50 ppm to about -175 ppm. So, thinking that the PTO's were still over-compensated, I went back and replaced about 100 pf in one of them with NPO discs. However, rather than reducing the drift further, or causing a downward drift, this merely caused the initial extreme upward drift to return. There's not much left for me to do, other than trying to find some type of linear, positive-coefficient capacitor. Mallory does manufacturer them (disc type SL), but they're apparently difficult to come by. Also, I've already spent a considerable sum on polystyrene capacitors and I'm reluctant to buy additional specialized capacitors after my results with the NPO's. If anyone has any suggestions or can point out an error in my thinking on this work, I would certainly appreciate it. 73, Jack WB3U From lwbyppp@epix.net Mon Feb 05 21:32:55 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!guardian.up.edu!gateway.sequent.com!uunet!in1.uu.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Shielded Capacitors Date: Tue, 30 Jan 96 22:31:03 GMT Lines: 14 Message-ID: <823085007.2216@pinetree.microserve.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 I'm working on a problem that requires small, shielded, PC-mount bypass caps. I need values around 0.1 and 0.05 uf, and the capacitors need to be constructed in such a way that when the "negative" lead is grounded, the inner case of the cap will prevent the "hot" side from radiating. Can someone tell me if any of the inexpensive monolithic or tantalum capacitors are constructed this way? If so, will 0.1 uf tantalums provide satisfactory bypassing at 9 MHz? Any suggestions for other (affordable) types that will do the job? 73, Jack WB3U From lwbyppp@epix.net Mon Feb 05 21:32:56 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Swan XTAL Filter Impedance ? Date: Tue, 30 Jan 96 22:44:20 GMT Lines: 19 Message-ID: <823085803.2494@pinetree.microserve.com> References: <4eals2$b51g@rs2.ccd.harris.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 dsnowden@ccd.harris.com (Doug Snowden) wrote: >I found an old Swan xtal filter the other day. I'd like to play around >with it in a receiver circuit. It is a 487-024 freq = 9001.65 khz. I >think I came from an old Swan Astro 100 transceiver. What is the in/out >impedance ? Guess I could play until I got it matched if all else fails. That's a good 8-pole, 2.4 KHz filter. It was used in quite a few models of Swan and Swan-related gear, including the Astro 103 that I own. I don't need a new filter at the moment, but could I convince you not to play with that particular component? They're not made anymore and someday, someone might have to trash their rig for lack of a replacement. Just my $.02. :) 73, Jack WB3U From lwbyppp@epix.net Mon Feb 05 21:32:57 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 4CX1600B Amp. Date: Tue, 30 Jan 96 22:47:00 GMT Lines: 8 Message-ID: <823085990.2494@pinetree.microserve.com> References: <310D977B.3E3E@interserf.net> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 Mike Sims wrote: >Looking for suggestions, warnings, cautions, etc. regarding >what I should lookout for the first time the 4CX1600B amp. is >turned on Don't look into the output connector. :) From lwbyppp@epix.net Mon Feb 05 21:32:58 1996 Path: news.epix.net!news.sprintlink.net!news.comm.net!imci3!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!boulder!spot.Colorado.EDU!tiemann From: tiemann@spot.Colorado.EDU (TIEMANN BRUCE) Newsgroups: rec.radio.amateur.homebrew Subject: Does bubble bath ruin paper caps? Date: 31 Jan 1996 01:44:19 GMT Organization: University of Colorado, Boulder Lines: 31 Message-ID: <4emhhj$c8s@peabody.colorado.edu> References: <4e6tbm$hdv@whidbey.whidbey.com> <4e9a5d$c08@i-2000.com> <1996Jan28.204639.8744@ke4zv.atl.ga.us> <4eiks1$l4a@pacific.mps.ohio-state.edu> NNTP-Posting-Host: spot.colorado.edu Summary: Paper caps are _already_ ruined, probably. Keywords: Paper caps - yuck! I've never (intentionally!) washed out electronic equipment with soapy water, but the question whether this hoplessly ruins paper caps has arisen. I say they're probably already ruined, even before getting washed! (Even if the thing they're in works just fine.) I discovered two interesting things about paper caps. First, when posed with 30 volts, many had measurable leakage currents, implying leakage resistances in only the few hundred megohm range, making them totally unsuitable for some applications, and second, that some charged and discharged in a visco-elastic sort of way, in that the charging current only slowly went to zero with continued application of constant charging voltage, and then when the thing was disconnected from the charging voltage and shorted out, the voltage shot back up again in a rebound. The worst offenders were all paper caps, and some rebounded back up 7 or 8 volts when offered 30 volts and then shorted momentarily. This isn't a hazard at the 30 volts I tested them at, but what about at the 400 or 600 volts they're rated for? They'd rebound some 100 volts - no good! I discarded them. Some of them rebounded back to 2 volts after being shorted for the second time, and were still at 2 V two or three days later. Ceramic caps had no measurable leakage current by my simple VOM, and hardly 100 mV of rebound voltage at most. They're smaller too, and probably have lower ESR as well. 0.047 uF @ 2 kV discs are $0.15 each at the local store. I see no need to worry about the detrimental effects of soap suds on paper caps; I'd worry about them as they are! Bruce Tiemann N6URH From lwbyppp@epix.net Mon Feb 05 21:33:00 1996 Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: PTO Temperature Compensation Date: Wed, 31 Jan 96 02:11:07 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 58 Distribution: world Message-ID: <4enu4k$gom@crash.microserve.net> NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 I have four identical PTO's in solid-state rigs that I've been trying to stabilize, with only limited success. Maybe someone with more experience in this area can help me with this. First, the oscillator is a JFET in the usual Colpitts configuration, operating from 5.0-5.5 MHz. From the factory, the two feedback capacitors are each 91 pf silver micas. The inductor is paralleled with approximately 140 pf. The latter is composed of three separate disc capacitors, ranging from N220 to N330 types. The problem I have with the PTO's is that they all drift upward as the temperature rises. Following a ten or fifteen minute warmup, I tracked the drift over a five or six hour period as the chassis of the rig(s) gradually warmed up. The first PTO (which probably had a bad component) would drift about 1.6 KHz. The second PTO drifted about 800 Hz, and the last two units both drifted about 300-400 Hz. I decided to tackle the worst ones first, and I began by replacing the oscillator transistors with MPF102's. This helped considerably. Next, following many, many hours of trial and error, I ended up replacing the silver micas with 100 pf polystyrene capacitors, and the remaining three compensation capacitors also with polystyrene units. Now the first two PTO's drift upward almost an identical amount, about 200-300 Hz during the same warmup period. This may not sound like much, but the problem is that when the rig is used to transmit, chassis temperature quickly rises another 10 or 15 degrees. This causes another drift to take place during the first hour or so of a QSO, and the drift amounts to approximately 200-300 Hz. This occurs in addition to the longer-term warmup drift, and it takes place no matter how long the rig is powered on prior to the QSO. One of the things that seems odd about this has to do with the capacitors I tried. First, as I gradually replaced the N220 and N330 capacitors with polystyrene units, the upward drift diminished. This has made me think that the PTO's were, in fact, over-compensated. Now, it's my understanding that polystyrene capacitors also exhibit a negative temperature coefficient, and that the coefficient is not particularly well controlled. Mallory states pretty wide variations for their capacitors, ranging from about -50 ppm to about -175 ppm. So, thinking that the PTO's were still over-compensated, I went back and replaced about 100 pf in one of them with NPO discs. However, rather than reducing the drift further, or causing a downward drift, this merely caused the initial extreme upward drift to return. There's not much left for me to do, other than trying to find some type of linear, positive-coefficient capacitor. Mallory does manufacturer them (disc type SL), but they're apparently difficult to come by. Also, I've already spent a considerable sum on polystyrene capacitors and I'm reluctant to buy additional specialized capacitors after my results with the NPO's. If anyone has any suggestions or can point out an error in my thinking on this work, I would certainly appreciate it. 73, Jack WB3U From lwbyppp@epix.net Mon Feb 05 21:33:01 1996 Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Shielded Capacitors Date: Wed, 31 Jan 96 02:12:46 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 13 Distribution: world Message-ID: <4enu7k$gom@crash.microserve.net> NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 I'm working on a problem that requires small, shielded, PC-mount bypass caps. I need values around 0.1 and 0.05 uf and the capacitors need to be constructed in such a way that when the "negative" lead is grounded, the inner case of the cap will prevent the "hot" side from radiating. Can someone tell me if any of the inexpensive monolithic or tantalum capacitors are constructed this way? If so, will 0.1 uf tantalums provide satisfactory bypassing at 9 MHz? Any suggestions for other (affordable) types that will do the job? 73, Jack WB3U From lwbyppp@epix.net Mon Feb 05 21:33:02 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WD-40 vice Contact/Tuner Spray!! Date: 31 Jan 1996 02:15:17 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 25 Sender: root@newsbf02.news.aol.com Message-ID: <4en4u5$etm@newsbf02.news.aol.com> References: <4eiks1$l4a@pacific.mps.ohio-state.edu> X-Newsreader: AOL Offline Reader In article <4eiks1$l4a@pacific.mps.ohio-state.edu>, James Garland writes: >I've never had the nerve to try this technique. I just can't bring >myself to dunk, say, my Central Electronics 100V in the bathtub and let >it soak. I'd be interested in knowing others' experience with this >cleaning method. Is it really necessary to remove the transformers? What >happens to the cardboard sleeves of IF transformers? Does it hopeless >ruin paper capacitors? Are there other precautions to take? > >Jim W8ZR A bubble bath may be the only way to clean the signal up an old boatanchor! (Just kidding Jim, I couldn't resist) Seriously. I use a quick soapy water bath, a water hose bath, then a distilled water bath, then I use an airhose to blow em out, then I let the rig dry under a heatlamp for a few days, and last I put a light coating of WD-40 in the right spots. I did that to a Ranger, DX-100 and an Apache. My rigs now look very clean and still work, only the signals are dirty. 73 Tom From lwbyppp@epix.net Mon Feb 05 21:33:03 1996 Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Swan XTAL Filter Impedance ? Date: Wed, 31 Jan 96 02:16:50 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 21 Distribution: world Message-ID: <4enuf9$gom@crash.microserve.net> NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 dsnowden@ccd.harris.com (Doug Snowden) wrote: >I found an old Swan xtal filter the other day. I'd like to play >around with it in a receiver circuit. It is a 487-024 freq = 9001.65 >khz. I think I came from an old Swan Astro 100 transceiver. What is >the in/out impedance ? Guess I could play until I got it matched if >all else fails. That's a good 8-pole, 2.4 KHz filter. It was used in quite a few models of Swan and Swan-related gear, including the Astro 103 that I own. I don't need a new filter at the moment, but could I convince you not to play with that particular component? They're not made anymore and someday, someone will probably have to trash their rig for lack of a replacement. On the other hand, if you're really determined to do this, send me some e-mail. I'll outline the details of the circuitry surrounding that filter in the 103. It will undoubtedly save you lots of cut and try. 73, Jack WB3U From lwbyppp@epix.net Mon Feb 05 21:33:04 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: jastorm@ix.netcom.com (Jim Storm) Newsgroups: rec.radio.amateur.homebrew Subject: Re: HELP Interference Date: Wed, 31 Jan 1996 03:54:44 GMT Organization: ix.netcom.com Lines: 21 Message-ID: <4emp65$kk2@cloner3.netcom.com> References: <4el9nf$h@ns2.ptd.net> NNTP-Posting-Host: ix-smx-ca3-11.ix.netcom.com X-NETCOM-Date: Tue Jan 30 7:54:46 PM PST 1996 X-Newsreader: Forte Free Agent 1.0.82 georgef@postoffice.ptd.net (George) wrote: >I'm trying to use my AEAfax to receive FAX/RTTY. But My computer >generates too much interfercne. I know its not the >monitor,mouse,keyboard,&modem. I've removed all and powered up CPU and >still get noise. I've taken CPU to another room (on another electrical >circuit) and still get a +20dB noise level from CPU. Now I'm on the >second story of a townhouse and my radios are only grounded to the >electrical system ground. I'm thinking of running a ground wire from >second floor wind and driving a rod in the ground. Will this help? I >know nothing about grounding. >Tnx >George You might want to try the JPS ANC-4. Unlike other DSP's, it goes in the antenna lead and is designed specifically for local noise. According to what I've read in the newsgroups, it's remarkably effective. It was tested in the latest issue of QST. 73, Jim WB6LWS From lwbyppp@epix.net Mon Feb 05 21:33:06 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.exodus.net!aimnet.com!ns2.mainstreet.net!sloth.swcp.com!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Re: HELP WITH SELECTING FIRST HANHELD HAM Date: 31 Jan 1996 04:08:52 GMT Organization: Los Alamos National Laboratory Lines: 39 Message-ID: <4emq0k$ip9@newshost.lanl.gov> References: <4emjbj$sa5@newsbf02.news.aol.com> NNTP-Posting-Host: jdport.lanl.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) To: alex948739@aol.com I'm sure you're joking or just fishing for flames, but you really CAN "work Russia" with a handheld radio. If you happen to live in south Florida or Northern New Mexico or Southern California or the Wasatch Front in Utah or other of the several areas having publicly available crossband remote base / repeater systems you can get user touchtone command lists from the owners/sysops and work DX via HF remote base from your walkie-talkie. You'll need most likely a dual bander with PL memory functions to enjoy both local area contacts with 2 meters and the DX and other fun stuff available through your nearest 220 or 440 remote base system. You should ask around your area before buying. Rarely are 2 meter repeaters set up for such exotic remote base functions (to be legal they have to be controlled via 220 MHZ or higher frequencies) but I know in South Florida at least one system is set up so that users can talk out on HF SSB with a 2 meter FM radio only, no UHF required. I've talked to them several times with MY handi-talkie using MY remote HF base system from here in NM. Keep in mind, now, that depending on your license, you will need to have a control operator on duty for you to legally talk through a remote base from your VHF/UHF rig on a particular HF frequency. You will not be able to just dial up 20 meters, for example, unless you have a general or higher class license. A properly licensed control op can dial it for you and let you talk under his "remote supervision", so it isn't normally something you can just do on the spur of the moment without the proper license but it's still fun.... and gets even more fun as you upgrade so you can also become a control op. If you by chance happen to live in northern NM I'd be happy to email you a list of our system's touchtone users commands. |-------------------------------------------------------| |Jim Devenport WB5AOX | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |HTTP://nis-www.lanl.gov/~jdport/ | |-------------------------------------------------------| From lwbyppp@epix.net Mon Feb 05 21:33:07 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!news.gate.net!bcfreenet.seflin.lib.fl.us!bcfreenet!z007298b From: z007298b@bcfreenet.seflin.lib.fl.us (Eliot Fenton) Newsgroups: rec.radio.amateur.homebrew Subject: Stereo xmitter chip? Date: 31 Jan 1996 05:08:30 GMT Organization: SEFLIN Free-Net - Broward Lines: 18 Message-ID: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> NNTP-Posting-Host: bcfreenet.seflin.lib.fl.us Keywords: stereo transmitter X-Newsreader: TIN [version 1.2 PL2] Pardon my lack of stereo fundamentals............... But does anyone know of a chip manufactured by Motorola, National, etc. that will take left and right stereo audio outputs (from say a C.D. player) and produce an RF carrier suitable for reception and demod. on any stereo receiver? If not a single chip, does anyone know of any articles written on how to build such a thing? I would think the hardest part would be generating the subcarrier (a PLL?), but I would like to see what other people have come up with. Regards, -- Eliot Fenton z007298b@bcfreenet.seflin.lib.fl.us Compuserve: 72633.3247@compuserve.com From lwbyppp@epix.net Mon Feb 05 21:33:08 1996 Path: news.epix.net!news.sprintlink.net!cyberspace.com!news.uoregon.edu!newsxfer.itd.umich.edu!news2.acs.oakland.edu!news.tacom.army.mil!ulowell.uml.edu!wang!news.kei.com!newsfeed.internetmci.com!primus.ac.net!news.cais.net!news.sfo.com!news.zeitgeist.net!hilbert.dnai.com!usenet From: Stan Jacox Newsgroups: rec.radio.amateur.homebrew Subject: Source of crystals? Date: 31 Jan 1996 05:59:47 GMT Organization: Studio Maintenance Center Lines: 10 Message-ID: <4en0gj$la4@hilbert.dnai.com> NNTP-Posting-Host: isdn27-10.dnai.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) I'm in the process of refurbing a Motorola Micor T83RTA mobile rig after many years of not working on commercial gear and found that I don't have a source for xtals. Apparently the grinders I used to use aren't in business anymore. Who still makes crystals for the KN1005 and KN1007 TCXOs? Looking through QST didn't reveal a single ad, Stan Jacox KM6XZ http://www.studio-maint.com/~stanj From lwbyppp@epix.net Mon Feb 05 21:33:09 1996 Path: news.epix.net!news.sprintlink.net!siemens!news.ecn.bgu.edu!ts117.eiu.bgu.edu!cgfrj From: cgfrj@bgu.edu (Rick Jones) Newsgroups: rec.radio.amateur.homebrew Subject: trx designs (vac tube or transistor) help / beginner Date: Wed, 31 Jan 1996 06:41:00 +1000 Organization: Eastern Illinois University Lines: 7 Message-ID: NNTP-Posting-Host: ts117.eiu.bgu.edu Keywords: build tube transistor X-Newsreader: Trumpet for Windows [Version 1.0 Rev B] I'm interested in possibly getting started in ham .. but I'd like to build my own set. Unfortunately, the only resources I've found to this regard is an old 20W transmitter vac tube design.. and a corresponding reciever. As I am looking up info.. I still have a few questions. Which is better a vac tube or transistor design for performance? Are there any more current designs for someone wanting to build their own system (simple at first, but able to be improved upon)? From lwbyppp@epix.net Mon Feb 05 21:33:11 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!ifwtech.demon.co.uk!G3SEK From: "Ian White, G3SEK" Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Re: Looking for mechanical filters. Date: Wed, 31 Jan 1996 07:59:18 +0000 Organization: IFW Technical Services Lines: 47 Distribution: world Message-ID: References: <310C3942.40B4@UTM.Edu> <$GoHIDAABiDxEwi3@ifwtech.demon.co.uk> <4elo7q$7ih@hobbes.cc.uga.edu> NNTP-Posting-Host: ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL> Xref: news.epix.net rec.radio.amateur.homebrew:13078 rec.radio.swap:56565 In article , Wes Stewart wrote: >In article <4elo7q$7ih@hobbes.cc.uga.edu> ignacy@num.ads.uga.edu (Ignacy >Misztal) writes: > >>The second filter eliminates noise from the other sideband (thus >>the 3db improvement) and eliminates the hiss. One can see a diffrence >>it makes when one compares CW reception with 1st IF with 2nd IF >>filters. Disregarding differences in slopes, the 2nd IF filter cuts >>the hiss and makes the signal sound more "professional". One can have >>a similar effect with a DSP, but good DSPs are not cheaper than >>the 2nd IF filter and the 3db advanatage is lost. The 3dB advantage isd in *IF* signal-to-noise ratio only - but the IF noise should always be overridden by noise received from the antenna and further up the RX chain. Unless the product detector is being overloaded by broadband IF noise, you probably wouldn't hear the difference. Wes again: *WARNING - TOPIC DRIFT :-) >As to audio DSP, I must confess to being underwhelmed with my DSP-9. I >consistently find that I'm using the 1.8 KHz BW even on EME strength CW. A >trained ear is still a lot better (IMHO) than a box full of electronics. In >the absence of QRM, I just don't see the necessity for "brick-wall" filters. A >couple of synchronously-tuned passive LC circuits and a good pair of hi-fi >phones work fine. No power supply, no hum, no hiss, no crossover distortion, >no cost:-) I love my DSP-9+ for EME (same filters as the DSP-9). Like Wes, I don't find the brick-wall characteristic very useful when the application is detecting weak signals rather than rejecting QRM. But the suppression of noise on unwanted frequencies away from the signal tends to aid this pair of trained ears. By concentrating harder I could probably switch out the DSP filter and continue to copy in 1.8kHz, but it would break my brain to do that for a whole pass of the moon. Different folks, different filters - always has been. By the way, in the latest 432 and Above EME newsletter, HB9BBD gives a good preliminary report for the TS-870 on very weak signals. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From lwbyppp@epix.net Mon Feb 05 21:33:12 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Dec QEX "construction article??" Date: Wed, 31 Jan 96 09:33:59 PDT Organization: Northwest Nexus Inc. Lines: 28 Message-ID: NNTP-Posting-Host: blv-pm11-ip30.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage Hi all, I just read my December QEX. Is anybody else out there bothered by whats happening at ARRL? The lead article sounded great "A Microprocessor Controlled Multiband Transceiver", but turned out to be of very, VERY limited value. I thought QEX was supposed to be an experimenters magazine - where people regularly build and modify equipment to try out new things. Just how does a description of building a bunch of kits and tying them together with a microprocessor controlled DDS board that has to be purchased from the author (or totally redesigned from the ground up) end up in QEX?? I have no problem with the author selling kits, but only after fully disclosing the design. What if I want to add some features, or some additional control outputs to drive some different or additional RF boards? If this was just all about building kits, then I guess that Heath would still be in business. I subscribed to QEX for the exchange of ideas and more technical design information than appears in QST; but this article doesn't do it for me. What do you think?? Either way, if you're a QEX subscriber, let QEX (at qex@arrl.org) or the editor Jon Bloom (at jbloom@arrl.org) know how you feel. Maybe I'm the only one upset by this diversion into product reviews. 73 de KI7RH (Jay Wicklund) From lwbyppp@epix.net Mon Feb 05 21:33:15 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WD-40 vice Contact/Tu Date: 31 Jan 1996 10:33:58 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 25 Sender: root@newsbf02.news.aol.com Message-ID: <4eo257$p3j@newsbf02.news.aol.com> References: <2a6.8063.546@acenet.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <2a6.8063.546@acenet.com>, brian.carling@acenet.com (Brian Carling) writes: >I used WD-40 to fix my 1957 Chevrolet when the alternator went bad. A long time ago I took a girl to the drive-in movies in my dad's 57 Ford..... >I had been driving down the highway when the ignition light came on and A few weeks later I developed a problem.... >smoke poured out of the hood. There was a very bad burning smell. .....almost like you describe here...... >All I did was dip the alternator in WD40 and blowit out a few times and .....I did something similar..... >it was as good as new. .....you said it. WD-40 fixes ANYTHING. It's just what the doctor ordered! ;-) From lwbyppp@epix.net Mon Feb 05 21:33:16 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!rain.fr!world-net!usenet From: opworld@worlnet.fr Newsgroups: rec.radio.amateur.homebrew Subject: Re: COIL WINDING PROGRAM (freeware Win95 only) Date: Wed, 31 Jan 1996 12:24:55 GMT Organization: World-Net information exchange, Internet provider. Lines: 12 Message-ID: <4ennab$ia8@aldebaran.sct.fr> References: <4eeig5$3qv@kryten.awinc.com> NNTP-Posting-Host: client114.sct.fr X-Newsreader: Forte Free Agent 1.0.82 jenna.design@awinc.com wrote: > Coil Winding Program for Windows95 CBVSR1.ZIP Hi, Look for same freeware but for windows 3.1 or DOS. Any pointers ? Have a nice opworld@worldnet.fr Day From lwbyppp@epix.net Mon Feb 05 21:33:17 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Shielded Capacitors Date: 31 Jan 1996 12:38:46 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 33 Sender: root@newsbf02.news.aol.com Message-ID: <4eo9f6$sbn@newsbf02.news.aol.com> References: <4enu7k$gom@crash.microserve.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4enu7k$gom@crash.microserve.net>, jackl@pinetree.microserve.com (WB3U) writes: >I'm working on a problem that requires small, shielded, PC-mount >bypass caps. I need values around 0.1 and 0.05 uf and the capacitors >need to be constructed in such a way that when the "negative" lead is >grounded, the inner case of the cap will prevent the "hot" side from >radiating. > >Can someone tell me if any of the inexpensive monolithic or tantalum >capacitors are constructed this way? If so, will 0.1 uf tantalums >provide satisfactory bypassing at 9 MHz? Any suggestions for other >(affordable) types that will do the job? > >73, >Jack WB3U Hi Jack, The cap behaves like a very small transmission line. The "shield" does nothing if it doesn't carry an equal and opposite current. Since that an impossible accomplishment with a two terminal component, the only solution is to keep the leads and component very short. The biggest reduction in stray coupling or radiation would come from using a densely packaged cap, like a multi-layer chip. It makes almost no difference if the ground foil is on the outside or inside of the component. The exception would be if the reactance of the bypass capacitor is so high compared to the circuit impedance that almost no current flows through the cap. But in that case it would be a poor bypass anyway! Catch 22! 73 Tom From lwbyppp@epix.net Mon Feb 05 21:33:18 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: Stereo xmitter chip? Date: Wed, 31 Jan 1996 15:29:11 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 29 Message-ID: References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> Eliot, there was an article in Radio Electronics some fifteen years ago titled something like "An FM Stereo Signal Generator" It used three or so common chips and a 19 KHz oscillator, which of course, was doubled and run through a 1596 balanced modulator to form the left minus right 38 KHz signal. I wish I could be more specific but that is a start, even if complete modulator chips are not available. Cliff Buttschardt W6HDO On 31 Jan 1996, Eliot Fenton wrote: > Pardon my lack of stereo fundamentals............... > > But does anyone know of a chip manufactured by Motorola, National, etc. > that will take left and right stereo audio outputs (from say a C.D. > player) and produce an RF carrier suitable for reception and demod. on any > stereo receiver? If not a single chip, does anyone know of any articles > written on how to build such a thing? I would think the hardest part > would be generating the subcarrier (a PLL?), but I would like to see what > other people have come up with. > > Regards, > > -- > > Eliot Fenton > z007298b@bcfreenet.seflin.lib.fl.us > Compuserve: 72633.3247@compuserve.com > > > From lwbyppp@epix.net Mon Feb 05 21:33:19 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!newsfeed.internetmci.com!in2.uu.net!news.cybercomm.net!raven.cybercomm.net!richg From: richg@raven.cybercomm.net (Rich Griffiths) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Shielded Capacitors Date: 31 Jan 1996 16:03:50 GMT Organization: CyberComm Online Services Lines: 16 Distribution: world Message-ID: <4eo3t6$lue@crow.cybercomm.net> References: <4enu7k$gom@crash.microserve.net> NNTP-Posting-Host: raven.cybercomm.net X-Newsreader: TIN [version 1.2 PL2] WB3U (jackl@pinetree.microserve.com) wrote: : I'm working on a problem that requires small, shielded, PC-mount : bypass caps. I need values around 0.1 and 0.05 uf and the capacitors : need to be constructed in such a way that when the "negative" lead is : grounded, the inner case of the cap will prevent the "hot" side from : radiating. Feed-through caps fit your physical description, if you can tolerate have an end sticking through the other side of the board. I don't know about finding values as big as 0.1, though. ============================================================ Rich Griffiths richg@raven.cybercomm.net Red Bank, New Jersey W2RG Monmouth County FN20wi From lwbyppp@epix.net Mon Feb 05 21:33:21 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!news.fsu.edu!freenet3.scri.fsu.edu!freenet3.scri.fsu.edu!not-for-mail From: bmm1@freenet3.scri.fsu.edu (Bruce M. Marshall) Newsgroups: rec.radio.amateur.homebrew,rec.radio.scanner Subject: need 10 to 150 khz FM demodulator Date: 31 Jan 1996 16:29:31 -0500 Organization: Tallahassee Free-Net Lines: 12 Message-ID: <4eomvr$mbf@freenet3.scri.fsu.edu> NNTP-Posting-Host: fn3.freenet.tlh.fl.us Xref: news.epix.net rec.radio.amateur.homebrew:13049 rec.radio.scanner:44773 Does anyone know of a chip that is used to demodulate multiplexed signals such as FM sterio, secondary audio programming (SAP) on TV sound and SCA on FM broadcast? I thought I could use my HF radio in FM mode but I tried it and it didn't work. I finally figured out that although the readout goes down to 0 hz it actually won't receive anything less than 150 khz (the manual says so and I can hear the relay click out.) I'm sure there is a small, easy circuit to do this. Bruce -- Bruce M. Marshall bmm1@freenet.fsu.edu voice 423 481 0990 fax 423 481 8039 From lwbyppp@epix.net Mon Feb 05 21:33:23 1996 Path: news.epix.net!news.sprintlink.net!news.frontiernet.net!Empire.Net!news.net99.net!News.MO.NET!tattoo.sccsi.com!nuchat!lurch.sccsi.com!news.sccsi.com!news.uh.edu!swrinde!newsfeed.internetmci.com!news.bctel.net!kryten.awinc.com!news From: jenna.design@awinc.com (JENNA DESIGN) Newsgroups: rec.radio.amateur.homebrew Subject: Re: COIL WINDING PROGRAM (freeware Win95 only) Date: 31 Jan 1996 17:20:23 GMT Organization: QRP Central Lines: 67 Message-ID: <4eo8cn$ofj@kryten.awinc.com> References: <4eeig5$3qv@kryten.awinc.com> <4ennab$ia8@aldebaran.sct.fr> NNTP-Posting-Host: pme028.awinc.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 In article <4ennab$ia8@aldebaran.sct.fr>, opworld@worlnet.fr says... > >jenna.design@awinc.com wrote: > >> Coil Winding Program for Windows95 CBVSR1.ZIP > >Hi, >Look for same freeware but for windows 3.1 or DOS. >Any pointers ? > >Have >a nice opworld@worldnet.fr >Day > CBVSR1 was only done for Win 95 only as we only do 32-bit programming now. However, we released another 16-bit app called QRP HomeBuilder that runs on Windows 3.1 in the spring of 1995. QRPHB1 is exclusively for homebrewers and would be of no use to "non-building" HAMS. It is freeware. same sites (SimTel) - ftp.coast.net or oak.oakland.edu etc path = Simtel/win3/hamradio/qrphb1.zip This app is rather banal looking. It has no toolbar, statusbar or fancy graphi cs, but we have had a lot of good comments regarding it's code. It has a module called CoilBuilder, which is the father to the new 32-bit coil program we just released. NOTES FOR QRP HOMEBUILDER1: There is a "hidden" bitmap schematic. Access it by clicking on the picture of the 3 element low-pass filter in the SYSTEM Menu. This is a previously unpublished schemati c given to us by Wes HayWard. Many users have e-mailed us , stating they want to to PRINT results screens. Since QRPHB1 has no printing capabilities, you have to do it in a round about method. << METHOD >> When you have a results screen displayed press the ALT and the PRINTSCREEN key s simultaneously. This will capture the screen to the Windows Clipboard. Exit or minimize QRP HomeBuilder. Now, open the Windows PaintBrush program and from the Menu select EDIT and th en PASTE. You should have a bitmapped copy of your results screen present. Then select the PRINT menu item. After printing, delete or do-not-save the b mp image. Although this method is crude, it does work. If you have a third party screen -capture program you can always use it, otherwise the method described works fine. There is a statement in QRPHB1 stating we will not post release notices of our QRP HomeBuilder series in the UseNet Newsgroups. We thought about it and have "appended our policy" . We will only post FREEW ARE program releases to the News Groups. It is our firm's belief that commercial interests of any nature for financial gain do not belong in the UseNet Newsgroups. We presently, have no connection to the Amateur Radio industry whatsoever. T he QRP HomeBuilder releases are released as freeware to promote electronics as a hobby and to give us something "fun" to work on; that is our reward. Thanks Rod and Todly Jenna Design From lwbyppp@epix.net Mon Feb 05 21:33:24 1996 Path: news.epix.net!news.sprintlink.net!news.interstat.net!news.sprintlink.net!NEWS.RMCI.NET!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!chi-news.cic.net!newsxfer2.itd.umich.edu!gatech!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: hts@thor.NET Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ham-Homebrew Digest V96 #28 Date: 31 Jan 96 19:37:33 GMT Organization: ucsd usenet gateway Lines: 4 Message-ID: <199601311937.NAA17917@odin.thor.net> References: <199601241230.EAA16239@mail.ucsd.edu> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I want to make a homepage. I don't know how? Where can I read in the internet that teach how to construct a home page? KC5RBM. From lwbyppp@epix.net Mon Feb 05 21:33:25 1996 Path: news.epix.net!news.sprintlink.net!NEWS.RMCI.NET!novia!news.dpc.net!news.heurikon.com!uwvax!uwm.edu!caen!kuhub.cc.ukans.edu!avalon.chinalake.navy.mil!usenet Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: Increasing the Power of the QST Antenna Tuner Message-ID: From: Bill Harwood Date: Wed, 31 Jan 1996 19:53:17 GMT Sender: usenet@avalon.chinalake.navy.mil (NAWS news admin) References: <1996Jan14.184339.12423@ke4zv.atl.ga.us> Organization: NAWS, China Lake, CA Content-Type: text/plain; charset=us-ascii To: kory@avatar.com Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:Pine.BSD/.3.91.960124193059.28141A-100000@avatar.avatar.com Lines: 13 Xref: news.epix.net rec.radio.amateur.equipment:24466 rec.radio.amateur.homebrew:13090 That is the solution that SGC uses in the SGC-230. It has a metal box cover over the digital part and a groundplane in the circuit board. Good Luck \------------------------------------------------------/ \ Bill Harwood U play it, I'll dance it / \ AB6DY or / \ I'll play it, U dance it / \----------------------------------------------/ From lwbyppp@epix.net Mon Feb 05 21:33:26 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!news.ais.net!vixen.cso.uiuc.edu!uwm.edu!chi-news.cic.net!news.math.psu.edu!news.cac.psu.edu!drm6!drm6 From: drm6@psu.edu (Drew R. McGhee) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Stereo xmitter chip? Date: Wed, 31 Jan 1996 21:11:57 GMT Organization: CAC Lines: 17 Message-ID: References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> NNTP-Posting-Host: zag.aa.psu.edu Keywords: stereo transmitter X-Authinfo-User: drm6@psu.edu X-Newsreader: Trumpet for Windows [Version 1.0 Rev B] >But does anyone know of a chip manufactured by Motorola, National, etc. >that will take left and right stereo audio outputs (from say a C.D. >player) and produce an RF carrier suitable for reception and demod. on any >stereo receiver? If not a single chip, does anyone know of any articles >written on how to build such a thing? I would think the hardest part >would be generating the subcarrier (a PLL?), but I would like to see what >other people have come up with. Greetings to Eliot and the group, There is a chip that does what you want. Sorry, can't think of the manufacturer. Ramsey sells two complete kits that uses it and does what you want. I've seen the chip sold separatly but can't find a listing in a catalog just for the chip at the present time. Drew R. McGhee, KA3EJV Altoona, PA From lwbyppp@epix.net Mon Feb 05 21:33:27 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier From: mzenier@netcom.com (Mark Zenier) Subject: Re: Stereo xmitter chip? Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> Date: Wed, 31 Jan 1996 21:24:33 GMT Lines: 25 Sender: mzenier@netcom6.netcom.com in <4emtge$t1g@bcfreenet.seflin.lib.fl.us>, Eliot Fenton wrote: : But does anyone know of a chip manufactured by Motorola, National, etc. : that will take left and right stereo audio outputs (from say a C.D. : player) and produce an RF carrier suitable for reception and demod. on any : stereo receiver? A Japanese company has a single chip stereo transmitter, the Rohm Ba1404. For an example, see a construction article in Radio-Electronics magazine for July 1992 or one for the Ramsey FM-10 in Popular Electronics (date unknown, but more recent). A scanned version of the spec sheet is somewhere in ftp://dg-rtp.dg.com/fm10/archives/ . Unless you want to deal with a fairly quirky chip, you can get a preassembled stereo to RF converter at your local discount store for about $20 in the form of the FX Wave Fx-100. Hanging on the pegboard in the audio department. (I use one hooked to my VCR for wireless headphones.) It's just LC tuned, but seems stable enough. The main chip has the label sanded off. It doesn't have enough pins to be a BA1404, but I suspect it is a related chip. I hear Rohm makes a stero multiplexer chip without the transmitter section. The FX wave has a seperate 4 transistor RF section. Mark Zenier mzenier@eskimo.com mzenier@netcom.com From lwbyppp@epix.net Mon Feb 05 21:33:28 1996 Path: news.epix.net!news.sprintlink.net!news.heurikon.com!uwvax!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in1.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet From: randg@sps.mot.com (Rand Gray) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dec QEX "construction article??" Date: 31 Jan 1996 22:21:38 GMT Organization: Motorola Corp., Austin, Texas Lines: 20 Distribution: world Message-ID: <4eoq1i$c8t@newsgate.sps.mot.com> References: Reply-To: randg@sps.mot.com NNTP-Posting-Host: chianti.sps.mot.com Jay Wicklund made some comments about our article in QEX, as though there was no way of reproducing the design without purchasing one of our kits. We included in the article 100% of the board schematics -- what we omitted was the 179 page software listing, which was obviously inappropriate anyway. The design includes a DDS which is controlled either from a knob or a keypad, and includes switching control to support anyone's RF modules to make up to a 10-band radio. The bulk of the article most certainly is NOT a "kit review" as characterized by KI7RH. 73, Tim, WA5VQK and Rand, W1GXN From lwbyppp@epix.net Mon Feb 05 21:33:29 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.convex.com!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!news.bu.edu!transfer.stratus.com!xylogics.com!news.ultranet.com!amber1.ultranet.com!user From: acj@ultranet.com (Jon Goguen) Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MIL VCO Date: 31 Jan 1996 23:36:10 GMT Organization: UltraNet Communications, Inc. Lines: 15 Message-ID: References: <4el6f3$r7h@aldebaran.sct.fr> NNTP-Posting-Host: amber1.ultranet.com X-Newsreader: Value-Added NewsWatcher 2.0b22.0+ Xref: news.epix.net sci.electronics.components:1783 rec.radio.amateur.homebrew:13054 In article <4el6f3$r7h@aldebaran.sct.fr>, opworld@worlnet.fr wrote: > Hi, > > I've heard that a compagny name Avantek (I'm not shure) make high > quality VCO. > > Does anyone have a pointer of other usefull information ? > Avantek was acquired by Hewlett Packard. You can still get an catalog of the Avantek products, but you'll have to contact HP for it. Cheers, Jon From lwbyppp@epix.net Mon Feb 05 21:33:30 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.u.washington.edu!uw-beaver!nntp.cs.ubc.ca!cs.ubc.ca!unixg.ubc.ca!van-bc!news.cyberstore.ca!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!usenet.continental.com!usenet From: Paul Christensen Newsgroups: rec.radio.amateur.homebrew Subject: Re: wrinkle paint Date: 31 Jan 1996 23:54:54 GMT Organization: Continental Cablevision Lines: 10 Message-ID: <4eovge$n7m@usenet.continental.com> References: <4egsuk$40b@news.wco.com> <1996Jan29.151709.13202@ke4zv.atl.ga.us> NNTP-Posting-Host: 169.152.167.70 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: gary@ke4zv.atl.ga.us >One caution, for some reason only black gives a good wrinkle finish. >If you want a different color, get the wrinkle with black, and then >top that with whatever color you want after the black dries and >wrinkles. Thanks for the advice. I'll try it this weekend on an old Vibroplex Champion base. -Paul, N9AZ