The World of Ham Radio CD-ROM From amsoft@epix.net Fri Aug 04 16:48:30 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!venus.sun.com!male.EBay.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: CMOS Superkeyer 3 Date: 1 Aug 1995 19:18:49 GMT Organization: SunSoft South, Los Angeles, CA Lines: 48 Message-ID: <3vlump$get@abyss.West.Sun.COM> References: NNTP-Posting-Host: sunspot.west.sun.com In article , Jim Stafford-W4QO wrote: >While you guys argue the merits of the whole thing being in QST in >something other than a product review (I'm not sure how I find out about >it if it's not in there), several folks have ordered and constructed the >project. Our club used the orginal SK2 as a club project and had barrels >of fun making it. Out of about 30 I know were constructed, no one ever >brought up that they felt slighted because they didn't have the code. The >orginal was in 1990 ? QST and it is absolutely the best keyer I have ever >found. Of course, I made many constructional variations in the packaging >- 1 1/2 x 2 x 2 1/2 inch bud case polished off on a buffing wheel to shine >line a mirror. A set of 3 AAA batteries last about a year in regular >operating. We had about 30 variations on the packaging and everyone >enjoyed showing them off at the club. BTW I plan to order the SK3 and >install it in one of my QRP rigs. I suspect that the proceeds from the >SK2 of which I think about 5000 were sold, probably had something to do >with their producing the SK3. An occasional proprietary code project as >good as this one certainly seems fine to me. Certainly, as I am fond of pointing out, you don't have to know what is inside a black box to use it effectively. However, the Super Keyer II and III both frustrated me in that the internals are completely obscured. Most black boxes I use have data which, at the minimum, describes the internal architecture. I generally look at QST construction articles as a way to learn; I can learn much without building something by looking at the diagrams and reading the text. I learned nothing about building a CPU based keyer from reading how to use the SKII/III. I personally think one of the areas that amateurs are falling behind the most is in embedded system design and development. This is probably why the omission of any design notes at all for the SKII/III irritates me the most; here's a project that could spark interest and learning in many amateurs about a very important technology, but it won't spark any learning to speak of. If I had more time, I'd love to develop some ham widget and article for QST, which exposes how embedded processors are used, and how a design can be implemented partly in hardware and partly in software. I'd also love to see QST increase the standards for construction articles to always require a description of the internal operation of any "black box". -- * 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 amsoft@epix.net Fri Aug 04 16:48:31 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hp-pcd!news.vcd.hp.com!news From: Don Huff Newsgroups: rec.radio.amateur.homebrew Subject: Re: Do vacuum tubes have shelf life? Date: 1 Aug 1995 19:49:46 GMT Organization: Hewlett-Packard Lines: 17 Message-ID: <3vm0gq$t9c@news.vcd.hp.com> References: <3v9hah$1cu@clarknet.clark.net> NNTP-Posting-Host: hpvcldu.vcd.hp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; HP-UX A.09.05 9000/720) X-URL: news:3v9hah$1cu@clarknet.clark.net I have tested 450TL's built before WWII, and they are perfect. Also, other glass xmitting tubes, such as 100TH/TL, 813, etc, which have been lying around for decades and still unused. They were all perfect, and the transconductance and characteristic curves were within specs. I have also found new, unused (in original boxes) receiving tubes, such as as the 30, 41, etc. They likewise tested like new. I have concluded that the shelf life of these kinds of tubes is INDEFINITE. Tubesdo not normally become "gassy" except through the outgassing of the internal parts due to elevated temperature. That is why xmitting tubes are pumped down while their elements are red-hot (by passing large currents thru them). It is fun to test these tubes, and plot their characteristics. I have contemplated making my own tube out of parts from broken ones, and pumping it down and resealing the glass envelope. "Final here uses a W6JL-1 triode, OM".... 73, Don, W6JL From amsoft@epix.net Fri Aug 04 16:48:31 1995 Path: grape.epix.net!news.sprintlink.net!uunet!in1.uu.net!pipeline!not-for-mail From: acatalan@nyc.pipeline.com (Anthony G. Catalano) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Why variable BFO? Date: 2 Aug 1995 00:49:29 -0400 Organization: The Pipeline Lines: 27 Message-ID: <3vn04p$jhi@pipe4.nyc.pipeline.com> NNTP-Posting-Host: pipe4.nyc.pipeline.com X-Newsreader: The Pipeline v3.1.1 On 31 Jul 1995 in article , 'ian.mitchell@research.utas.edu.au (Ian Mitchell)' wrote: >Has anyone noticed that the low cost SW receivers use a variable >BFO for SSB reception, whilst the more expensive ones have a USB >LSB switch? > >Is this because of the bigger frequency tuning steps in the lower >cost receivers? Or does it have something to do with the bandwidth >of the IF filter for SSB? The el-cheapo BFO is simply a carrier injected into the AM detector. I did the equivilent with an AM only portable SONY simply by placing my grid-dip meter around 455khz nearby. Opposite sideband rejection was non-existent. A true USB/LSB receiver implements a narroband filter where the incoming 455khz signal is shifted a bit up or down acordingly by mixing one of two crystals (usb/lsb) to provide the needed selectivity to reject the opposite sideband. This method of true ssb reception is much more expensive to manufacture than the simple BFO method that usually works ok untill a nearby or opposite sideband signal appears. Anthony G. Catalano WW2W From amsoft@epix.net Fri Aug 04 16:48:32 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!alfa02.medio.net!guysmiley.blarg.com!eskimo!billb From: billb@eskimo.com (William Beaty) Subject: Vision by microwave X-Nntp-Posting-Host: eskimo.com Message-ID: Sender: usenet@eskimo.com (News User Id) Organization: Eskimo North (206) For-Ever X-Newsreader: TIN [version 1.2 PL2] Date: Wed, 2 Aug 1995 00:51:46 GMT Lines: 14 I'm working on a microwave camera using mechanical scanning and an old cop-radar detector. This is strictly at the hobbyist level. I hope to be able to record slowscan stills of conductive objects scattered about in a transparant insulating environment. Should be interesting. Anyone here ever heard of such a thing? Microwave mavens have any advice? I'd like to eventually try something better than 10GHZ, if I can find a source for emitter and detector devices. -- ....................uuuu / oo \ uuuu........,............................. William Beaty voice:206-781-3320 bbs:206-789-0775 cserv:71241,3623 EE/Programmer/Science exhibit designer http://www.eskimo.com/~billb/ Seattle, WA 98117 billb@eskimo.com SCIENCE HOBBYIST web page From amsoft@epix.net Fri Aug 04 16:48:33 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sgigate.sgi.com!genmagic!bug.rahul.net!a2i!news.erinet.com!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.homebrew Subject: Re: Easy 2m reciever? Date: 2 Aug 1995 02:41:38 GMT Organization: Los Alamos National Laboratory Lines: 14 Message-ID: <3vmol2$osr@newshost.lanl.gov> References: <3vm1sh$pps@news.doit.wisc.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 1.1N (Windows; I; 16bit) To: lumkes@cae.wisc.edu Ramsey Electronics has a 2M tunable FM receiver kit that would be difficult to purchase parts separately for the money: 29.95. 1-800-446-2295 item "FR-146" I built their 220 version and it works quite well. -- *********** Jim Devenport WB5AOX ************** * PO Box 445, McIntosh NM 87032 * * 505-832-1462 weekends, 667-1055 workdays * * http://nis-www.lanl.gov/~jdport/ * *********************************************** From amsoft@epix.net Fri Aug 04 16:48:34 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!howland.reston.ans.net!swrinde!tank.news.pipex.net!pipex!uunet!in2.uu.net!prodigy.com!usenet From: FJEX69A@prodigy.com (Jeffrey Hill) Newsgroups: rec.radio.amateur.homebrew Subject: GTO Thyristors/source needed Date: 2 Aug 1995 03:04:44 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 12 Distribution: world Message-ID: <3vmq0c$18l0@usenetw1.news.prodigy.com> NNTP-Posting-Host: inugap2.news.prodigy.com X-Newsreader: Version 1.2 I'm designing an off-line convertor to provide plate potential for several other devices and I need a source for gate turn-off SCRs. These need to be able to switch about 10 A avg and be able to tolerate at 750 V peak-reverse. If you know of a dealer or distributor which can sell these in small quantities, please reply by your choice of means. thank you for your attention. 73, Jeff AC4AQ/NNN0FBG From amsoft@epix.net Fri Aug 04 16:48:35 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!uop!csus.edu!netcom.com!snorris From: snorris@netcom.com (Sean Norris) Subject: Re: Vision by microwave Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: Date: Wed, 2 Aug 1995 03:36:26 GMT Lines: 42 Sender: snorris@netcom20.netcom.com In article , William Beaty wrote: >I'm working on a microwave camera using mechanical scanning and an old >cop-radar detector. This is strictly at the hobbyist level. I hope to be >able to record slowscan stills of conductive objects scattered about in a >transparant insulating environment. Should be interesting. Anyone here >ever heard of such a thing? Microwave mavens have any advice? I'd like >to eventually try something better than 10GHZ, if I can find a source for >emitter and detector devices. > > >-- >....................uuuu / oo \ uuuu........,............................. >William Beaty voice:206-781-3320 bbs:206-789-0775 cserv:71241,3623 >EE/Programmer/Science exhibit designer http://www.eskimo.com/~billb/ >Seattle, WA 98117 billb@eskimo.com SCIENCE HOBBYIST web page I've used one before. It was a 94GHz millimeter-wave imaging system. A little higher in frequency than you're doing, but the same idea. It also was a mechanical scanning design due to the single reciever design. At 10 GHz though, I don't think you'll see much. The 94 GHz system that I worked with used 94GHz frequency because of the fact that 94GHz happens to be a frequency that passes through normal atmospheric conditions with less attenuation than most other frequencies. Also the human body happens to emit in the 94GHz region as well. It is similiar to the 3-5 um and 8-12 um infrared-bands, but with far less resolution due to the lower frequency, but it can peneterate things that IR cannot, such as fog and even thin walls perhaps. The images that we got were very poor by todays CCD camera standards. You could make out forms such as people, cars, animals, and buildings but beyond that no further recognition was possible. So at 10 GHz I think your going to be very disappointed, but it does sound like a fun project and I wish you the best of luck. E-mail me if you want to know any further details, Sean ----------------------------------------------------------------------------- Sean Norris snorris@netcom.com RF Engineer --KE6BTE-- Loyalty, above all else. San Diego, CA ----------------------------------------------------------------------------- From amsoft@epix.net Fri Aug 04 16:48:36 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!EU.net!uunet!in2.uu.net!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet From: Grant H Youngman Newsgroups: rec.radio.amateur.homebrew Subject: Re: Why variable BFO? Date: 2 Aug 1995 03:47:56 GMT Organization: PSI Public Usenet Link Lines: 45 Message-ID: <3vmshc$elk@usenet1.interramp.com> References: <3vhlvb$7u0@franklin.cc.utas.edu.au> <3vka4f$c8b@usenet1.interramp.com> NNTP-Posting-Host: ip185.bakersfield.ca.interramp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b2 (Windows; I; 16bit) To: gmfoster@grape.epix.net Garry Foster wrote: > >This may all be true Grant but the question waas why do cheap recievers >have BFO and good recievers have selectable sidebands. >TYhe answer is that cheap recievers have cheap bfo because they are >cheaper and work better with limited recievers. They certianly don't have >bfo's because they are more complex and cost more. I don't understand. You don't need fixed frequency BFO's to have selectible sidebands. Many radios use one BFO and have TWO filters, one for LSB, one for USB. You kind of missed the point. At 455KHz (typical IF frequency) fixed frequency BFOs are more stable, but that doesn't mean there is something inherently more costly or "better"in a fixed frequency scheme. At lower IF frequencies (50,60 KHz) crystal controlled BFOs are not all that practical anyway -- and the BETTER gear that used these frequencies provided control over the BFO frequency. > >And switchable frequency beat oscilators don't work at all unless you >have very fine tunning steps 100 Hz min and 10 Hz preferable > Patently untrue. >The best selectable sidebands change the filters not the beat frequency. Some receivers do this as I stated above. BUT, there is still good reason to have the BFO frequency variable under operator control for the reasons of audio response setting that I stated in my first reply. > > Garry > WB0NNO >Actually anymore gome of the real expensive recievers change the software >to select the sidebands with a DSP unit running at the last IF. > Interesting, isn't it. We're back to the PHASING method of sideband generation/detection again. Only difference between these "real expensive" units and the early sideband rigs of the 50's is a wee more sophistication in the application of Norgaards principles of the phasing method. Grant From amsoft@epix.net Fri Aug 04 16:48:37 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!EU.net!sun4nl!news.zeelandnet.nl!news From: hremijn@zeelandnet.nl (Henk Remijn) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QEX Magazine Date: 2 Aug 1995 04:26:00 GMT Organization: Henk Remijn Lines: 20 Message-ID: <3vmuoo$29j@news.zeelandnet.nl> References: <3vm17a$kn7@vesta.chch.planet.co.nz> Reply-To: hremijn@zeelandnet.nl (Henk Remijn) NNTP-Posting-Host: slip6.zeelandnet.nl X-Newsreader: IBM NewsReader/2 v1.2 In <3vm17a$kn7@vesta.chch.planet.co.nz>, jonw@chch.planet.co.nz (Jonathon Woodward) writes: >I am looking for the address and fax number of QEX magazine so I can >subscribe. I am particularly interested in an article published in the >June 1993 edition on measuring SINAD with DSP. > >Any help would be appreciated. > >Cheers Jonathan > > QEX is published by the ARRL, I guess you can find their address somewhere. Henk Henk Remijn Systems engineer at PA3EOB (JO11WM) Cargill Wet Milling Hansweert, The Netherlands Bergen op Zoom E-mail: hremijn@zeelandnet.nl The Netherlands pa3eob@pi8goe.ampr.org From amsoft@epix.net Fri Aug 04 16:48:37 1995 Path: grape.epix.net!news.sprintlink.net!news.i.net!news.world.net!world.net!usenet From: Ference Kish Newsgroups: rec.radio.amateur.homebrew Subject: Re: Winding Coils Date: Wed, 02 Aug 95 08:15:12 PDT Lines: 22 Message-ID: References: <3v4gio$fjv@news.azstarnet.com> NNTP-Posting-Host: adel01.world.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage > > It seems to me that I recently read something in QST (Technical Correspondence, I think) about > this topic. Of course, I have a habit of bringing out the old issues and going over them > again, so it could have been in an older issue. The author developed some new equations for > calculating inductance and pointed out the errors in the old "reliable" formulas. > > Maybe Zack will read this and remember. Otherwise, say the word and I'll try to find it > again. > > Regards, Wes -- N7WS > YES, PLEASE regards, ference From amsoft@epix.net Fri Aug 04 16:48:39 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in1.uu.net!newsflash.concordia.ca!nstn.ns.ca!coranto.ucs.mun.ca!noah!dbeach From: dbeach@kean.ucs.mun.ca (David Beach, NorFam, Memorial University) Newsgroups: rec.radio.amateur.homebrew Subject: Re: August QST CMOS Keyer 3 Date: 2 Aug 95 11:04:32 -0330 NST Organization: Memorial University. St.John's Nfld, Canada Lines: 50 Message-ID: <1995Aug2.110432.1@noah> NNTP-Posting-Host: noah.ucs.mun.ca I realize that the 'CMOS Superkeyer III' exchange and QST bashing is almost reaching the flogging a dead horse stage so I think I will pursue a slightly different aspect - what I would like to see. I believe the Voice-Track Repeater Controller (QST June & July 95) is a example of what QST MPU-based 'construction' articles (product reviews are a different matter) should be like. Preprogrammed EPROMs, disks with the source code and and PCBs are available from the author at a reasonable cost. The code is also available from the ARRL as are the PCB templates. The code is free for personal, non-commercial use. Similar comments apply to the Talking Morse Code Practice Computer (QST July 94). Bravo to these authors for sharing their work with their amateur friends! I would bet that most people who construct these will likely buy parts from the authors anyway despite the availability of the code - $15-20 for the pre-programmed EPROM is not a bad deal. And, kits are a great convenience for those of us in the boonies. The experimenters among us still have the opportunity fiddle the code and blow EPROMs if they wish. How would I like things to be - ideally? 1) Take a specific project for a specific MPU (e.g. keyer with memory) 2) Make available algorithms as well as source code to aid understanding and to aid transfer to another MPU or modified hardware platform. 3) Write modularized code/algorithms so that one can more easily add/subtract features that one wants (You do want a programmed practice mode? You don't? OK- your choice!) 4) Post everything on the ARRL BBS for free distribution for non-commercial use and modification (heck, some people might even allow commercial use!) So, anybody out there willing to write public domain code for something like a simple keyer with memory, a more deluxe keyer, a Morse code 'de-coder' (as in a recent 73 Am Rad article) or even a keyer plus decoder plus digital freq display for QRP rigs? Who knows what someone might develop! Anyway, I can't 'put up' the code because I am not (at this point) a programmer so I will do my best to 'shut up' on further discussion - but no promises! David Beach VO2BD From amsoft@epix.net Fri Aug 04 16:48:40 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!uwm.edu!lll-winken.llnl.gov!uop!pacbell.com!gw2.att.com!nntpa!zeus!jkbe From: jkbe@zeus (John_Bednar) Subject: Re: August qst cmos keyer Message-ID: Sender: news@nntpa.cb.att.com (Netnews Administration) Nntp-Posting-Host: zeus.cnet.att.com Organization: AT&T X-Newsreader: TIN [version 1.2 PL2] References: <807202985.AA03054@hamlink.mn.org> <1995Aug1.142532.21874@ke4zv.atl.ga.us> Date: Wed, 2 Aug 1995 12:27:14 GMT Lines: 17 Gary Coffman (gary@ke4zv.atl.ga.us) wrote: : Speaking of keyers, has anyone built the keyer on the cover of the : June issue of 73? It's a alarm clock, keyer, and code reader all in : one, and it's also based on a preprogrammed microcontroller you have : to buy from the author. : Gary The question is...can you duplicate the microcontroller or get the eprom image from their BBS? That's what steams me the most about the QST article. Many can duplicate the QST keyer for much less than $55.00 but the author(s) and/or Idiom Press locked out that possibility. Having the source code isn't necessary to duplicating the keyer and that doesn't appear to be the prevailing issue of this thread. John From amsoft@epix.net Fri Aug 04 16:48:41 1995 Path: grape.epix.net!news.sprintlink.net!EU.net!Germany.EU.net!nntp.gmd.de!news.rwth-aachen.de!newsserver.rrzn.uni-hannover.de!tubsibr!duesentrieb!mkl From: mkl@rob.cs.tu-bs.de (Mario Klebsch DG1AM) Newsgroups: rec.radio.amateur.homebrew,alt.radio.digital,fido.ham-radio,rec.radio.amateur.digital.misc,uk.radio.amateur,de.comm.ham Subject: Re: need opinions&pointers: tech: PR in urban areas Date: 2 Aug 95 12:45:27 GMT Organization: TU Braunschweig, Informatik (Bueltenweg), Germany Lines: 24 Distribution: world Message-ID: References: <3v87uj$jkf@gina.zfn.uni-bremen.de> <3vb83o$b4p@nz12.rz.uni-karlsruhe.de> <806959469snz@mikebray.demon.co.uk> <3vcasq$pc8@parsifal.nando.net> NNTP-Posting-Host: duesentrieb.rob.cs.tu-bs.de X-Newsreader: NN version 6.5.0 #2 (NOV) Xref: grape.epix.net rec.radio.amateur.homebrew:8675 alt.radio.digital:954 rec.radio.amateur.digital.misc:9864 DB Wilhelm writes: >Tim@mikebray.demon.co.uk (Tim Bray) wrote: >> >> > Tricks gearbeitet und Du kommst auf max gesicherte 9600 Bit/s !!!!! >> Please tell me if I am wrong, but isn't this a uk.* group ???????? >Sorry Tim, this is a hr.* (that's Ham Radio) group, and it comes in >all languages. OTOH, my version of "Netequette" says that English >is the more commonly understood language and use of a newsgroup >should be in the most commonly understood form. To do otherwise >is a waste of bandwidth, and should have been sent as e-mail. This thread is crosposted to several newsgroups (rec.radio.amateur.homebrew, alt.radio.digital, fido.ham-radio, rec.radio.amateur.digital.misc, uk.radio.amateur,de.comm.ham) (where is the hr.* ? ). Not everybody realizes crossposting, and since there is a german newsgroup included, the original poster should expect responses in german, too. 73, Mario -- Mario Klebsch, DG1AM, M.Klebsch@tu-bs.de +49 531 / 391 - 7457 Institut fuer Robotik und Prozessinformatik der TU Braunschweig Hamburger Strasse 267, 38114 Braunschweig, Germany From amsoft@epix.net Fri Aug 04 16:48:41 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uunet!in2.uu.net!iglou!newton.cacky.com!rwilcox From: rwilcox@newton.cacky.com (Gary Wilcox) Subject: Old GE UHF HT X-Nntp-Posting-Host: m5.cacky.com Message-ID: Keywords: HT Convert Sender: news@iglou.com (News Administrator) Reply-To: rwilcox@newton.cacky.com (Gary Wilcox) Organization: Commonwealth Aluminum Date: Wed, 2 Aug 1995 13:14:55 GMT Lines: 12 All I have aquired an old GE UHF HT. It doesnt have a model number but it has the number 121A MP1 Series. It has 2 channels in the 450 Mhz range. Can this be converted to Amateur use? Is it as simple as changing crystals. How hard would it be to build a VFO to replace the crystal. Gary Wilcox KE4VUN rwilcox@newton.cacky.com From amsoft@epix.net Fri Aug 04 16:48:43 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.sprintlink.net!uunet!in1.uu.net!world!daw From: daw@world.std.com (David A Wallace) Subject: Re: Program for coil windings Message-ID: Organization: The World, Public Access Internet, Brookline, MA References: Date: Wed, 2 Aug 1995 13:28:49 GMT Lines: 129 10 REM SOLENOID COIL DESIGN 20 REM 30 REM FORMULA FROM ARRL HANDBOOK FOR AIR-WOUND COILS 40 REM 50 REM 60 REM 70 REM 80 REM 90 REM 100 DIM PT(40) 110 REM 120 REM Initialize wire table info (also from ARRL Handbook) 130 REM 140 PT(1) = 1 / .3 150 PT(2) = 1 / .265 160 PT(3) = 1 / .235 170 PT(4) = 1 / .215 180 PT(5) = 1 / .196 190 PT(6) = 1 / .175 200 PT(7) = 1 / .155 210 PT(8) = 7.6 220 PT(9) = 8.600001 230 PT(10) = 9.600001 240 PT(11) = 10.7 250 PT(12) = 12 260 PT(13) = 13.5 270 PT(14) = 15 280 PT(15) = 16.8 290 PT(16) = 18.9 300 PT(17) = 21.2 310 PT(18) = 23.6 320 PT(19) = 26.4 330 PT(20) = 29.4 340 PT(21) = 33.1 350 PT(22) = 37 360 PT(23) = 41.3 370 PT(24) = 46.3 380 PT(25) = 51.7 390 PT(26) = 58 400 PT(27) = 64.9 410 PT(28) = 72.7 420 PT(29) = 81.6 430 PT(30) = 90.5 440 PT(31) = 101 450 PT(32) = 113 460 PT(33) = 127 470 PT(34) = 143 480 PT(35) = 158 490 PT(36) = 175 500 PT(37) = 198 510 PT(38) = 224 520 PT(39) = 248 530 PT(40) = 282 540 REM 550 REM 560 REM 570 PI = 3.14159 580 REM 590 REM 600 INPUT "Do you need to calculate the inductance frist (y/n/q)"; A$ 601 IF A$ = "y" THEN A$ = "Y" 602 IF A$ = "n" THEN A$ = "N" 603 IF A$ = "q" THEN A$ = "Q" 610 IF A$ <> "Q" THEN GOTO 630 620 STOP 630 IF A$ <> "Y" THEN GOTO 700 640 INPUT "Capacitor (pf)"; C 650 INPUT "Frequency (mHz)"; F 660 L = 1000000! / (4 * PI * PI * F * F * C) 670 PRINT "Inductance ="; L; "microhenries." 680 GOTO 1010 690 REM 700 REM 710 REM 720 REM 730 REM 740 REM 750 REM 760 REM 770 REM 780 REM 790 REM 800 REM 810 REM 820 REM 830 REM 840 REM 850 REM 860 REM 870 REM 880 REM 890 REM 900 REM 910 REM 920 REM 930 REM 940 REM 950 REM 960 REM 970 REM 980 REM 990 REM 1000 INPUT "Desired Inductance (uHy) "; L 1010 INPUT "Coil diameter (inches) "; D 1020 INPUT "Turns per inch (or wire gauge if negative) "; P0 1030 IF P0 < 0 THEN P = PT(-P0): ELSE P = P0 1040 R = D / 2 1050 REM L = r * r * n * n / (9 * r + 10 * n / p) 1060 REM solved for n: 1070 REM 0 = r * r * n * n - L * 9 * r - L * 10 * n / p 1080 A = R * R 1090 B = -L * 10 / P 1100 C = -L * 9 * R 1110 REM solve quadratic equation (-b + sqr(b*b - 4 * a * c)) / (2 * a) 1120 N = -B / (2 * A) + SQR(B * B - 4 * A * C) / (2 * A) 1130 N = 10 * N 1140 N = INT(N) 1150 N = N / 10 1160 PRINT "For an inductance of"; L; "uHy on a"; D; "inch dia. form, wind"; N; 1170 PRINT "turns " 1180 IF P0 < 0 THEN PRINT "of #"; -P0; "wire."; 1181 ELSE PRINT "at"; P0; "turns per inch."; 1190 W = N / P 1200 W = W * 100 1210 W = INT(W) 1220 W = W / 100 1230 PRINT " Coil will be"; W; "inches long." 1240 GOTO 600 From amsoft@epix.net Fri Aug 04 16:48:43 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.starnet.net!wupost!news.utdallas.edu!corpgate!bcarh189.bnr.ca!bcarh8ab.bnr.ca!bkani23 From: kirkland@bnr.ca (Bill Kirkland) Newsgroups: rec.radio.amateur.homebrew Subject: Coil data for Rhode's QST article Date: 2 Aug 1995 13:31:47 GMT Organization: Bell Northern Research Ltd. Lines: 7 Message-ID: <3vnuo3$8tk@bcarh8ab.bnr.ca> NNTP-Posting-Host: bkani23.bnr.ca X-Newsreader: News Xpress Version 1.0 Beta #4 Does anyone know the coil data, i.e. coil forms, used in the circuits described by Rhode in his March 95 QST article "A High-Performance Hybrid Frequency Synthesizer"? The winding data is there but there is no information on the coil forms. Bill Kirkland VE3JHU From amsoft@epix.net Fri Aug 04 16:48:44 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.starnet.net!wupost!news.utdallas.edu!corpgate!bcarh189.bnr.ca!bcrkh13.bnr.ca!bwdlh591!ejacksch From: ejacksch@bnr.ca (Eric Jacksch) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: VHF/UHF XTAL CW XMITTER Date: 2 Aug 1995 13:51:19 GMT Organization: Bell Northern Research Lines: 17 Message-ID: <3vnvsn$85m@bcrkh13.bnr.ca> NNTP-Posting-Host: bwdlh591.bnr.ca X-Newsreader: TIN [version 1.2 PL1] Xref: grape.epix.net rec.radio.amateur.homebrew:8676 rec.radio.amateur.misc:84198 I'm interested in building a low power crystal controlled CW transmitter for for the 2m, 220 MHz, or 70cm bands. (radio to operate on one freqency only... the 220 band would be nice, but I'm interested in the others as well). The application is a low speed data link involving microcontrollers and PC's...I want to keep it as small, light, and inexpensive as possible. I'd appreciate any leads on schematics, plans, kits, etc. Thanks, Eric. VE3 XEJ (mail replies appreciated) ejacksch@entrust.com jacksch@tenebris.com From amsoft@epix.net Fri Aug 04 16:48:44 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!simtel!harbinger.cc.monash.edu.au!news.uwa.edu.au!bluering.cowan.edu.au!usenet From: st95169a@pilot.stu.cowan.edu.au (Gary Jones) Newsgroups: rec.radio.amateur.homebrew Subject: FM 900 Date: Wed, 02 Aug 1995 14:09:03 GMT Organization: Edith Cowan University Lines: 15 Message-ID: <3vo44e$10ch@bluering.cowan.edu.au> NNTP-Posting-Host: ppp32.cowan.edu.au X-Newsreader: Forte Free Agent v0.46 I'm posting this for a friend with no net access, excuse me if i'm vague (his topic, not mine) My friend is looking for the source code/file for a Philips FM 900 radio. He tells me to write that it's 8602 source code. Ring any bells with anyone? Please reply via email to st95169a@pilot.stu.cowan.edu.au Thanks, Gary. From amsoft@epix.net Fri Aug 04 16:48:45 1995 From: Bob.Liesenfeld@f100.n282.z1.fidonet.org (Bob Liesenfeld) Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!uunet!in1.uu.net!rosevax!hamlink!fredmail Newsgroups: rec.radio.amateur.homebrew Subject: Re: Super cmos iii keyer Message-ID: <807387649.AA03074@hamlink.mn.org> Date: Wed, 02 Aug 1995 14:19:10 -0100 X-FTN-To: Adams@chuck.dallas.sgi Lines: 6 No flames here. Could not have said it better myself. Bob WB0POQ Technology is *OUT* of control..... From amsoft@epix.net Fri Aug 04 16:48:46 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!newsfeed.internetmci.com!solaris.cc.vt.edu!news.netins.net!news.netins.net!negaard From: negaard@draagen.graceland.edu (David Negaard (Oberon-)) Newsgroups: rec.radio.amateur.homebrew Subject: Project idea (WAS: Re: CMOS Superkeyer 3) Date: 02 Aug 1995 14:49:31 GMT Organization: INS Information Services, Des Moines, Iowa, USA Lines: 43 Distribution: world Message-ID: References: <3vlump$get@abyss.West.Sun.COM> NNTP-Posting-Host: draagen.graceland.edu In-reply-to: myers@West.Sun.COM's message of 1 Aug 1995 19:18:49 GMT >>>>> "Dana" == Dana Myers writes: Dana> In article , Dana> Jim Stafford-W4QO wrote: >> [...] Dana> [...] I personally think one of the areas that amateurs are Dana> falling behind the most is in embedded system design and Dana> development. This is probably why the omission of any design Dana> notes at all for the SKII/III irritates me the most; here's a Dana> project that could spark interest and learning in many amateurs Dana> about a very important technology, but it won't spark any Dana> learning to speak of. On this note, I remember seeing a page or two on the Baycomm Web server discussing a modem that had been implemented with a microcontroller and software...three chips total, I think. I couldn't find it the last time I visited, but the idea intrigued me. If I only knew a _little_ more than I do, I'd be interested in using this method to implement the modems I'm hoping to need to go with the OptoSCC I'm hoping to have. In fact, I'd be interested in doing this even without knowing a little more: I can follow simple instructions... Dana> If I had more time, I'd love to develop some ham widget and Dana> article for QST, which exposes how embedded processors are used, Dana> and how a design can be implemented partly in hardware and Dana> partly in software. I'd also love to see QST increase the Dana> standards for construction articles to always require a Dana> description of the internal operation of any "black box". Ditto. And if anyone has any references that might point the way for a project like the one mentioned above (I'm especially interested in PSK satellite modes, but would be intrigued by almost any implementation), please let me know. Dana> * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * Dana> * (310) 348-6043 | mine and do not necessarily * Dana> * Dana.Myers@West.Sun.Com | reflect those of my employer * -- o David Negaard o negaard@graceland.edu o Help Desk Technician o http://www.graceland.edu/~negaard o 700 College Avenue o linux-phile o Lamoni, IA 50140 o 73 de KB0PXK From amsoft@epix.net Fri Aug 04 16:48:47 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!news.moneng.mei.com!news.ecn.bgu.edu!vixen.cso.uiuc.edu!sdd.hp.com!swrinde!emory!metro.atlanta.com!news.sprintlink.net!newsfeed.internetmci.com!uunet!in2.uu.net!news.iii.net!iii2.iii.net!not-for-mail From: sefranek@iii2.iii.net (Thomas C Sefranek) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Current balun Date: 2 Aug 1995 15:00:05 -0400 Organization: iii.net Lines: 17 Message-ID: <3vohvl$7n1@iii2.iii.net> References: <3vg7dp$mgl$1@brisbane.DIALix.oz.au> NNTP-Posting-Host: iii2.iii.net Keywords: Current baluns Well Murray, Do you expect the cable manufacturers to be : Should they "know" what frequency your going to use their cable for? Should they "know" what length to make your cable? Should they "know" what power level your going to use? Should they "know" what attenuation you consider adequate? The torroid materials have a frequency range! They have a finite power handling ability/volume! They have finite attenuation characteristics. Enough? Tom -- Thomas C. J. Sefranek WA1RHP Work: 508-425-2200 Home: 508-425-6672 From amsoft@epix.net Fri Aug 04 16:48:48 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!caen!usenet.cis.ufl.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.sprintlink.net!uunet!in2.uu.net!news.iii.net!iii2.iii.net!not-for-mail From: sefranek@iii2.iii.net (Thomas C Sefranek) Newsgroups: rec.radio.amateur.homebrew Subject: Re: August qst cmos keyer Date: 2 Aug 1995 15:03:50 -0400 Organization: iii.net Lines: 13 Message-ID: <3voi6m$7r4@iii2.iii.net> References: <807060001.AA03043@hamlink.mn.org> NNTP-Posting-Host: iii2.iii.net Hey clue-less ones! Read the archives! If you continue to clutter this group with the same old tired arguments... I'm gonna post a rumor I heard about Cregg Shargold, a dying boy... :) Tom -- Thomas C. J. Sefranek WA1RHP Work: 508-425-2200 Home: 508-425-6672 From amsoft@epix.net Fri Aug 04 16:48:49 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!delmarva.com!udel!rochester!cornellcs!travelers.mail.cornell.edu!news.tc.cornell.edu!newsserver.sdsc.edu!news.cerf.net!nntp-server.caltech.edu!ferrari.mst6.lanl.gov!newshost.lanl.gov!usenet From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Re: Old GE UHF HT Date: 2 Aug 1995 16:06:35 GMT Organization: Los Alamos National Laboratory Lines: 27 Message-ID: <3vo7qb$b5i@newshost.lanl.gov> References: NNTP-Posting-Host: jdport.lanl.gov Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: rwilcox@newton.cacky.com Yes, it is as easy as changing crystals.... but you will have to align the transmitter and receiver RF & oascillator/driver stages for best sensitivity and output. If the original frequency is between 450 and 460 MHZ this is likely all you'll have to do. If it is much above 460 MHZ you may well not be able to align it to specs without modifying it by changing capacitance values in various stages in which case you'll certainly want a repair manual for it. Depending on what model GE it is, it may be one of the series that employs a completely separate receiver and transmitter, that might make it easily made into a low power repeater. VFO's of course are possible but very hard to keep stable enough for satisfactory operation at these frequencies. The necessary VFO output might be as low as 36 MHZ but since it is multiplied in frequency by subsequent stages whatever instability or error occurs is also multiplied by a like amount. -- *********** Jim Devenport WB5AOX ************** * PO Box 445, McIntosh NM 87032 * * 505-832-1462 weekends, 667-1055 workdays * * http://nis-www.lanl.gov/~jdport/ * *********************************************** From amsoft@epix.net Fri Aug 04 16:48:49 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!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: Longwave Transmitter Date: 2 Aug 1995 18:50:47 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 11 Sender: root@newsbf02.news.aol.com Message-ID: <3vovg7$ju8@newsbf02.news.aol.com> Reply-To: pfzouave@aol.com (PFZouave) NNTP-Posting-Host: newsbf02.mail.aol.com It was my understanding that some segment of the longwave band had been set aside for license-free experimentation, provided you stayed under a certain power level. In fact, I have vague memories of an article for such a transmitter in a back issue of Radio Electronics (or some similar magazine). Does any one know the rules regarding longwave experimentation? Is there a web site for this sort of data? Please email any responses. PFZouave@aol.com Pete Friedrichs *** Common Sense Is Not That Common *** From amsoft@epix.net Fri Aug 04 16:48:50 1995 Path: grape.epix.net!news.sprintlink.net!psgrain!news.tek.com!gv-gate.gvg.tek.com!usenet From: Grover Cleveland Newsgroups: rec.radio.amateur.homebrew Subject: (no subject) Date: 2 Aug 1995 18:58:50 GMT Organization: The Grass Valley Group Inc. Lines: 5 Message-ID: <3vohta$q63@gv-gate.gvg.tek.com> NNTP-Posting-Host: grovmac.gvg.tek.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-URL: news:rec.radio.amateur.homebrew Can someone please point me to the qrp mailing list? 73 de WT6P From amsoft@epix.net Fri Aug 04 16:48:51 1995 Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon From: Leon Heller Newsgroups: rec.radio.amateur.homebrew Subject: Re: Easy 2m reciever? Date: Wed, 02 Aug 95 19:14:44 GMT Organization: Home Lines: 17 Message-ID: <807390884snz@lfheller.demon.co.uk> References: <3vm1sh$pps@news.doit.wisc.edu> Reply-To: Leon@lfheller.demon.co.uk X-NNTP-Posting-Host: lfheller.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 In article <3vm1sh$pps@news.doit.wisc.edu> lumkes@cae.wisc.edu "John Lumkes" writes: > Looking for an easy to build circuit plan for a 2m reciever. Just > something to get me started in homebrewing and such that I can monitor > the local repeater signals. References to mag articles, chips, anything... You can build a single chip 2m Rx with the Philips TDA7000. It will be out of spec. but I got one to receive 2m packet without any problems. They are intended for VHF/FM broadcast reception. 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 amsoft@epix.net Fri Aug 04 16:48:51 1995 Path: grape.epix.net!bman.uucom.com!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!not-for-mail From: skulyov@freenet.columbus.oh.us (Sergei Kulyov) Newsgroups: rec.radio.amateur.homebrew Subject: Need Cardwell Condensor Co. info Date: 2 Aug 1995 19:38:14 -0400 Organization: The Greater Columbus FreeNet Lines: 10 Message-ID: <3vp296$2mv@acme.freenet.columbus.oh.us> NNTP-Posting-Host: acme.freenet.columbus.oh.us X-Newsreader: TIN [version 1.2 PL2] Hi gang, I'm looking for the address or fax of Cardwell Condensor Co. which produced air vary capacitors. Appreciate for any help. 73! Sergei AA8OT, UA3AP From amsoft@epix.net Fri Aug 04 16:48:52 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!newsspool.doit.wisc.edu!koala.uwec.edu!usenet From: dan drumm Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment Subject: ROTOR - Channel master - old tv salvage Date: 2 Aug 1995 20:38:14 GMT Organization: University of Wisconsin Eau Claire Lines: 20 Message-ID: <3vonnm$3ho@koala.uwec.edu> NNTP-Posting-Host: lilith.uwec.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; OSF1 V3.2 alpha) X-URL: news:rec.radio.amateur.antenna/6586-6685#3vljh1$ipk@newsbf02.news.aol.com Xref: grape.epix.net rec.radio.amateur.antenna:12519 rec.radio.amateur.homebrew:8687 rec.radio.amateur.misc:84222 rec.radio.amateur.equipment:15344 Ground score! I found an antenna rotor, but have little not no info. Does anyone have/use/know about the channel master crown. I got it from someone who was reroofing --complete with tripod for the roof, but I do not have the controler, and I do not even know the voltage it needs (my guess is 12v). All I can see are the three wires used to control it. It is real old, but fits nicely into me new budget; it was free. ..any help or references appreciated. Dan Drumm N9VOX (general is comming real soon now, but I like this call!) drumm@uwec.edu Wishing you and extra hour each day. From amsoft@epix.net Fri Aug 04 16:48:53 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.sprintlink.net!cs.utexas.edu!convex!seas.smu.edu!scott From: scott@seas.smu.edu (Scott Carpenter) Newsgroups: rec.radio.amateur.homebrew Subject: Good SPICE book Date: 2 Aug 1995 21:10:52 GMT Organization: Southern Methodist University - School of Engineering and Applied Science Lines: 4 Sender: Scott Carpenter Distribution: world Message-ID: <3vopks$j7c@giant.seas.smu.edu> NNTP-Posting-Host: express.seas.smu.edu Keywords: SPICE Cc: carp@gpspc_rsc.comsys.rockwell.com Would someone please recommend a good book for a beginner SPICE user? Thanks! From amsoft@epix.net Fri Aug 04 16:48:53 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!EU.net!uknet!SoNet!news From: Robert Clegg Newsgroups: rec.radio.amateur.homebrew Subject: Radio Module Wanted Date: 2 Aug 1995 21:11:53 GMT Organization: SoNet - The first Internet provider on the south coast Lines: 3 Message-ID: <3vopmp$mqj@alpha.aladdin.co.uk> NNTP-Posting-Host: castle.aladdin.co.uk Wanted: The R/F Module (M57737) For Yaesu FT720R Send Via: castle@aladdin.co.uk From amsoft@epix.net Fri Aug 04 16:48:54 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.sprintlink.net!simtel!harbinger.cc.monash.edu.au!newsroom.utas.edu.au!news From: ian.mitchell@research.utas.edu.au (Ian Mitchell) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Why variable BFO? Date: 2 Aug 1995 23:39:20 GMT Organization: University of Tasmania Lines: 18 Message-ID: <3vp2b8$qpr@franklin.cc.utas.edu.au> References: <3vn04p$jhi@pipe4.nyc.pipeline.com> NNTP-Posting-Host: pc122.research.utas.edu.au Mime-Version: 1.0 X-Newsreader: WinVN 0.99.2 In article <3vn04p$jhi@pipe4.nyc.pipeline.com>, acatalan@nyc.pipeline.com says... >The el-cheapo BFO is simply a carrier injected into the AM detector. >This method of true ssb reception is much more expensive to manufacture >than the simple BFO method that usually works ok untill a nearby or opposite >sideband signal appears. >Anthony G. Catalano WW2W Ok, does that mean in a low cost receiver with a not so narrow IF filter, a fixed frequency BFO (frequency set to middle of IF) could be used to resolve an SSB signal, regardless of which side band the signal is on, as long as there are no other nearby signals? And presumably small tuning steps would be a necessity. Thanks, Ian From amsoft@epix.net Fri Aug 04 16:48:55 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!sonnet1.sonnet.com!news From: wyatt@moa.com (Wyatt Earp) Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew Subject: Anyone use and/or like the Ramsey TV-6 transmitter? Date: Thu, 03 Aug 1995 01:02:08 GMT Organization: SONNET Networking - Modesto Sonora Stockton (800)50-ONLINE Lines: 37 Message-ID: <3vp73l$7co@sonnet1.sonnet.com> NNTP-Posting-Host: ppp14.moa.com X-Newsreader: Forte Free Agent 1.0.82 Xref: grape.epix.net alt.radio.pirate:9431 sci.electronics:138055 rec.radio.amateur.homebrew:8693 I bought the Ramsey TV-6 kit and the LPA-1 1 watt amp with the hopes of transmitting my cable box / VCR to all the TV's in the house and not have to run coax. The kits went together with no problems, but the performance from the TV-6 transmitter is nothing to brag about. I have managed to get a crappy, rolling, wavy black and white picture with some audio. Doesn't matter if I use the TV-6 kit alone with the built in whip, an external 'dipole' of (2) 3.5 foot wires, or the LPA-1 and the dipole. It is looking like this will never replace running coax to every TV in the house. I plan to build a better antenna by tapeing the two wires of the dipole to a stick. Should my coax lead-in be a certain length? Right now it is an RCA plug with two 3.5 foot wires sticking out. I string them on the floor 180 deg apart. Adjusting coil L4 to tune the sucker to the right channel is not an easy process. I played with it for several hours, but never got a good picture with any antenna / tuning combo. It would seem to me that any good TV transmitter (or FM too) would have to have a crystal oscillator to work with modern digital tuners. To watch the picture I mainly used my Spectricon 12" portable with analog looking tuner (The old 2 knob type) with AFT and rabbit ears. It was on sale at Goodguys a few years ago and gets cable great. If you read the catalog, the unit should transmit hundreds of feet with the crummy whip antenna. When I bought the LPA-1 too, I was worried that I would transmit to a large chunk of my town! Does anyone use the TV-6 to actually watch TV? Or is it a toy? Should I design and build a crystal oscillator for it? I don't see why I would want to change channels much once I picked one. I live 30 miles from the nearest TV station, BTW. Thanks, Wyatt From amsoft@epix.net Fri Aug 04 16:48:56 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!!tvr From: tvr@les.CNMAT.Berkeley.EDU (Tovar) Newsgroups: alt.cad,aus.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Re: Data wanted on Motorola MRF571/MC Date: 03 Aug 1995 01:59:47 GMT Organization: CNMAT Lines: 20 Message-ID: References: <3vik3l$gql$1@perth.DIALix.oz.au> <3vj2cj$lq@cnn.exu.ericsson.se> NNTP-Posting-Host: les.cnmat.berkeley.edu In-reply-to: eus.eusmge@memo.ericsson.se's message of Mon, 31 Jul 1995 17:03:17 GMT Xref: grape.epix.net alt.cad:6382 rec.radio.amateur.homebrew:8694 daveb@perth.DIALix.oz.au (David Brooks) wrote: >Does anyone know of a site carrying data sheets and/or SPICE models for >Motorola RF power bipolars, specifically MRF571/MC ? Dave, try Motorola's WWW site. It is at http://motserv.indirect.com/ Lots of technical info and your requests for additional catalogs or info are promptly serviced. ---Mike I think you may need to use their fax-back service http://motserv.indirect.com/home2/fax_rqst.html as searching their (very preliminary set of) databooks for "MRF571" only yields hits on a higher voltage version of the MRF5711 (MRF0211LT1), a surface mount component. I have also had good experiences using their services. -- KD6PAG (networking old-timer, RF newbie) From amsoft@epix.net Fri Aug 04 16:48:57 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!nash.pubnix.net!usenet From: Mark Hillier Newsgroups: rec.radio.amateur.homebrew Subject: 2 Mbit/sec 10GHz Microwave link Date: 3 Aug 1995 02:03:54 GMT Organization: PubNIX Montreal Lines: 9 Distribution: inet Message-ID: <3vpaqa$5cg@nash.pubnix.net> NNTP-Posting-Host: port95.pubnix.net I am interested in the article in the 1990, 1991 ARRL Handbooks about a 10GHz high-speed data link. The Handbook mentions that the original article appears in the December 1989 issue of Ham Radio Magazine. Does anyone know where I might be able to get a copy of that article ? Thanks, Mark VE2HVW From amsoft@epix.net Fri Aug 04 16:48:57 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.dacom.co.kr!news.netins.net!usenet From: tkc@netins.net (TKC) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter Date: Thu, 03 Aug 1995 02:45:32 GMT Organization: INS Information Services, Des Moines, Iowa, USA Lines: 20 Message-ID: <3vpd7v$sfb@insosf1.netins.net> References: <3vovg7$ju8@newsbf02.news.aol.com> NNTP-Posting-Host: s2236.netins.net X-Newsreader: Forte Agent .99.82 pfzouave@aol.com (PFZouave) wrote: :>It was my understanding that some segment of the longwave band had been :>set aside for license-free experimentation, provided you stayed under a :>certain power level. In fact, I have vague memories of an article for such :>a transmitter in a back issue of Radio Electronics (or some similar :>magazine). :>Does any one know the rules regarding longwave experimentation? Is there a :>web site for this sort of data? Please email any responses. :>PFZouave@aol.com :>Pete Friedrichs :>*** Common Sense Is Not That Common *** Can't remember the freq. but the power was 100 mw with I think 50 ft antenna... The saving thing was that you have no restrictions on the receiving ant.. Make it BIG :) ************ TKC ************ From amsoft@epix.net Fri Aug 04 16:49:00 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!unixg.ubc.ca!info.ucla.edu!news.ucdavis.edu!csus.edu!netcom.com!dick From: dick@netcom.com (Richard Arnold) Subject: coil winding program Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) Date: Thu, 3 Aug 1995 04:37:37 GMT Lines: 123 Sender: dick@netcom.netcom.com Here is a simple C program I threw together a few years back to save me the trouble of iterative calculations on a hand calculator. What else is a computer good for? I also bemoan the fact that very few programs are posted for the unix environment, so here is a little contribution. I hope this saves at least one coil-winder a little time... /* A simple coil calculation program based on the inductance formula presented in the ARRL Handbook for many years. Artlessly coded by Dick Arnold, W5VEC. This program was written on a Sun workstation and compiles and runs on SunOS 3.5 thru 4.1.3. Hopefully Solaris as well. Close-wound single-layer coil calculation. To use, simply compile and run. It's interactive, asking for wire gage if known, and target inductance. It overshoots the target by one turn. You can fix this if you want (what's a turn between friends?). Totally standard disclaimers: not to be used in life-support systems, military or other applications where loss of life may be incurred. Change at will; don't ask for help -- I left customer support some time ago... */ #include FILE *wfd; char wfile[80] = {"coil.tmp"}; /* don't ya just hate hard coded stuff? */ main() { float dia, tgt, len; float r,n,l; int nmax, gauge, eflag; /* get the variables */ eflag = 0; printf("\nCoil Calculation Program\n\n"); printf("Enter:\n"); printf(" wire gauge: "); scanf("%d",&gauge); switch (gauge){ case 8: dia = 0.1285; break; case 9: dia = 0.1144; break; case 10: dia = 0.1019; break; case 11: dia = 0.0907; break; case 12: dia = 0.0808; break; case 13: dia = 0.0719; break; case 14: dia = 0.0640; break; case 15: dia = 0.0571; break; case 16: dia = 0.0508; break; case 17: dia = 0.0453; break; case 18: dia = 0.0403; break; case 19: dia = 0.0363; break; case 20: dia = 0.0320; break; case 21: dia = 0.0285; break; case 22: dia = 0.0254; break; case 23: dia = 0.0226; break; case 24: dia = 0.0201; break; case 25: dia = 0.0179; break; case 26: dia = 0.0159; break; case 27: dia = 0.0142; break; case 28: dia = 0.0126; break; case 29: dia = 0.0113; break; case 30: dia = 0.0100; break; default: printf("Not in wire table\n");eflag = 1; } if(eflag == 1){ printf(" diameter of wire,inches: "); scanf("%f",&dia); } printf(" target inductance, microhenries: "); scanf("%f",&tgt); printf(" coil radius, inches: "); scanf("%f",&r); printf("\n"); wfd = fopen(wfile,"w"); fprintf(wfd,"radius is %.2f wire dia = %.4f",r,dia); if(eflag == 0) fprintf(wfd," gauge = %d\n",gauge); else fprintf(wfd,"\n"); /* compute here */ nmax = 3000; n = 0; len=(dia*n); l = ((r*n)*(r*n)) / (9*r + 10*len); fprintf(wfd,"turns\t\tinductance\n"); while (tgt > l) { n++; len = (dia * n); l = ((r*n)*(r*n)) / (9*r + 10*len); fprintf(wfd,"%.0f\t\t%.2f\n",n,l); if (n >= nmax) { break; } } if (n < nmax) { printf("------------------------------------------------\n"); printf("number of turns:\t%.0f\n",n); printf("inductance:\t\t%.2f microhenries\n",l); printf("coil length:\t\t%.2f inches\n\n",len); } else printf("** values given are impractical **\n\n"); fclose(wfd); exit(0); } From amsoft@epix.net Fri Aug 04 16:49:01 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!simtel!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!centralnews1.Central.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter Date: 3 Aug 1995 06:24:11 GMT Organization: SunSoft South, Los Angeles, CA Lines: 30 Message-ID: <3vpq2b$cb9@abyss.West.Sun.COM> References: <3vovg7$ju8@newsbf02.news.aol.com> <3vpd7v$sfb@insosf1.netins.net> NNTP-Posting-Host: sunspot.west.sun.com In article <3vpd7v$sfb@insosf1.netins.net>, TKC wrote: >pfzouave@aol.com (PFZouave) wrote: > >:>It was my understanding that some segment of the longwave band had been >:>set aside for license-free experimentation, provided you stayed under a >:>certain power level. In fact, I have vague memories of an article for such >:>a transmitter in a back issue of Radio Electronics (or some similar >:>magazine). > >:>Does any one know the rules regarding longwave experimentation? Is there a >:>web site for this sort of data? Please email any responses. >:>PFZouave@aol.com >:>Pete Friedrichs >:>*** Common Sense Is Not That Common *** > >Can't remember the freq. but the power was 100 mw with I think 50 ft >antenna... Actually, the answer is 170-190KHz, maximum of 1W PA input, 15m total length of antenna, feedline and grounding system. >The saving thing was that you have no restrictions on the receiving >ant.. Make it BIG :) Or make it an active loop... -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From amsoft@epix.net Fri Aug 04 16:49:03 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!agate!!tvr From: tvr@les.CNMAT.Berkeley.EDU (Tovar) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter ['lowfer' band] Date: 03 Aug 1995 07:09:12 GMT Organization: CNMAT Lines: 88 Message-ID: References: <3vovg7$ju8@newsbf02.news.aol.com> <3vpd7v$sfb@insosf1.netins.net> NNTP-Posting-Host: les.cnmat.berkeley.edu In-reply-to: tkc@netins.net's message of Thu, 03 Aug 1995 02:45:32 GMT pfzouave@aol.com (PFZouave) wrote: :>It was my understanding that some segment of the longwave band had been :>set aside for license-free experimentation, provided you stayed under a :>certain power level. In fact, I have vague memories of an article for such :>a transmitter in a back issue of Radio Electronics (or some similar :>magazine). :>Does any one know the rules regarding longwave experimentation? Is there a :>web site for this sort of data? Please email any responses. :>PFZouave@aol.com :>Pete Friedrichs :>*** Common Sense Is Not That Common *** Can't remember the freq. but the power was 100 mw with I think 50 ft antenna... The saving thing was that you have no restrictions on the receiving ant.. Make it BIG :) ************ TKC ************ My recent poking around the Internet has let me to conclude that 1750 meters is governed by Part 15: Sec. 15.217 Operation in the band 160-190 kHz. (a) The total input power to the final radio frequency stage (exclusive of filament or heater power) shall not exceed one watt. (b) The total length of the transmission line, antenna, and ground lead (if used) shall not exceed 15 meters. (c) All emissions below 160 kHz or above 190 kHz shall be attenuated at least 20 dB below the level of the unmodulated carrier. Determination of compliance with the 20 dB attenuation specification may be based on measurements at the intentional radiator's antenna output terminal unless the intentional radiator uses a permanently attached antenna, in which case compliance shall be demonstrated by measuring the radiated emissions. and that experimenters like ourselves are governed by: Sec. 15.23 Home-built devices. (a) Equipment authorization is not required for devices that are not marketed, are not constructed from a kit, and are built in quantities of five or less for personal use. (b) It is recognized that the individual builder of home-built equipment may not possess the means to perform the measurements for determining compliance with the regulations. In this case, the builder is expected to employ good engineering practices to meet the specified technical standards to the greatest extent practicable. The provisions of Sec. 15.5 apply to this equipment. and the relevant part of that section reads: Sec. 15.5 General conditions of operation. ... (b) Operation of an intentional, unintentional, or incidental radiator is subject to the conditions that no harmful interference is caused and that interference must be accepted that may be caused by the operation of an authorized radio station, by another intentional or unintentional radiator, by industrial, scientific and medical (ISM) equipment, or by an incidental radiator. (c) The operator of a radio frequency device shall be required to cease operating the device upon notification by a Commission representative that the device is causing harmful interference. Operation shall not resume until the condition causing the harmful interference has been corrected. ... According to Part 15, we are talking about intentional radiators, and of course, you want to cease operating before 15.5(c) applies. Note also that Part 15 doesn't talk about receiving antennas; that's a matter between you and your local zoning authority... Please see: ftp://ftp.cs.buffalo.edu/pub/ham-radio/1750m.band for further details, including an organization and journal for the 'lowfer'. Part 15 is available from The U.S. House of Representatives Internet Law Library Code of Federal Regulations [http://www.pls.com:8001/his/cfr.html ask if you need help searching it]. -- KD6PAG P.S. I'd be interested in hearing from any S.F. Bay Area lowfer's, if there are any around who might help me get started. Anyone know which issue of "73" or "QST" had the 'lowfer' project in the past few years? I misplaced my copy. From amsoft@epix.net Fri Aug 04 16:49:04 1995 Path: grape.epix.net!news.sprintlink.net!news.gate.net!not-for-mail From: hrick@news.gate.net (Rick Harrison) Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew Subject: Re: Anyone use and/or like the Ramsey TV-6 transmitter? Date: 3 Aug 1995 07:50:04 -0400 Organization: Cybergate, Inc. Lines: 8 Message-ID: <3vqd5c$2186@navajo.gate.net> References: <3vp73l$7co@sonnet1.sonnet.com> NNTP-Posting-Host: navajo.gate.net Xref: grape.epix.net alt.radio.pirate:9434 sci.electronics:138105 rec.radio.amateur.homebrew:8704 There are better TV transmitter kits on the market. Read the Low Power Broadcasting FAQ on alt.radio.pirate, or send me an e-mail request for it and I will mail it to you. -- Rick Harrison (hrick@gate.net) PO Box 54-7014, Orlando FL 32854 USA From amsoft@epix.net Fri Aug 04 16:49:04 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!ix.netcom.com!netnews From: drted@ix.netcom.com (Ted Viens) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Looking for source of toroid cores & ferrite beads Date: 3 Aug 1995 08:41:08 GMT Organization: Netcom Lines: 31 Distribution: world Message-ID: <3vq234$sph@ixnews2.ix.netcom.com> References: NNTP-Posting-Host: ix-hou5-15.ix.netcom.com In herbr@netcom.com (Herb Rosenberg) writes: > >I am on amajor crusade to eliminate rfi coming from my computers that is >getting into the HF rigs. I am looking for a good source of toroid >beads, snap on chokes, and ferrite cores for fighting this stuff. > >I have some information on Palomar Engineering, and Radio Shack, but >there products seem to be over priced (I think). > >Does anyone out there know of any good sources for these types of >products with really good pricing? > >Any help would be appreaciated. > >Thanks. > >-- >herbr@netcom.com Surplus stores, Herb, surplus stores. I have bought small bags of large ferrite potting bobbins at surplus stores here in Houston at prices from .25 to 1.25 each. Probably 10 cents on the dollar or better. Then I put a small loop in the power cord or computer cable and push it over the core of the bobbin. I may tape a ferrite bar over the open end. Works fairly well. If you don't have a good selection in a local electronics surplus store, buy a couple of electronic hobbyist magazines and check the adds for the mail order surplus stores such as Allright and All Electronics etc., etc... -- Bye... Ted.. Deep in the Heart of the Armpits of Houston, Texas... From amsoft@epix.net Fri Aug 04 16:49:05 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news1.digex.net!news3.digex.net!digex.net!not-for-mail From: gc@universe.digex.net (Gary Chatters) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VARIALBE DC POWER SUPPLY Date: 3 Aug 1995 10:15:14 -0400 Organization: Universal Access by Digital Express. 800-969-9090 Lines: 20 Message-ID: <3vqlli$aqc@universe.digex.net> References: <3v3321$p75@kasey.umkc.edu> NNTP-Posting-Host: universe.digex.net Summary: consider heat dissipation in design Keywords: power heat heatsink In article <3v3321$p75@kasey.umkc.edu>, JOHNSON wrote: >I'd like to build a low-cost variable DC power supply that would produce >4-40 volts DC at about 2amps. Could anyone help me with this project? > When designing your power supply you must consider power dissipation requirements. Voltage regulator ICs are quite easy to use, but you must consider voltage and current AND power dissipation limits. For your requirements ( 4-40 VDC at 2 amps), suppose that the voltage input to the regulator is 42 volts. Then the worst case for power dissipation is (42 - 4 ) * 2 = 76 watts. That is a lot of power to dissipate in a TO-3 case and will require a large heat sink. I don't have my databooks here, so I am not sure that many regulator ICs can even handle that much power. Many regulator ICs are capable of shutting down in case of thermal overload, but external pass transistors aren't that smart. gc From amsoft@epix.net Fri Aug 04 16:49:06 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!psgrain!nntp.teleport.com!teleport.com!radio From: radio@teleport.com (FBenterprises) Newsgroups: rec.radio.amateur.homebrew Subject: FBenterprises Web Page Date: Thu, 3 Aug 1995 12:07:46 Organization: FBenterprises Lines: 14 Message-ID: NNTP-Posting-Host: ip-vanc2-27.teleport.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] Just a quick announcement of FBenterprises new Web Page. FBenterprises sells Amateur Radio Publications, including Repeater Maps, and the full line of ARRL Publications (at a DISCOUNT!). The URL for the page is: http://www.teleport.com/~radio/ham.html Thank you! 73! Bob Martin N7JXN FBenterprises From amsoft@epix.net Fri Aug 04 16:49:07 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!news.uh.edu!news.sccsi.com!nuchat!academia!john.dilks From: john.dilks@academia.com (John Dilks) Newsgroups: rec.radio.amateur.homebrew Subject: HF amp 4CX1000A help Message-ID: <3896.1041.uupcb@academia.com> Date: 3 Aug 95 13:15:00 GMT Distribution: world Organization: ACADEMIA BBS - Northfield, NJ - 609-383-9400 Reply-To: john.dilks@academia.com (John Dilks) References: <3v1ili$hi3@hermes.oanet.com> Lines: 16 Gerald Caouette asks: -> Am looking to home build a single tube 4CX1000A 160 - 6 Meter -> amplifier: Gerald, Your amp is in some of the older ARRL Handbooks, as I remember. I have a number of them. If you don't get help from others, send me some mail and I'll spend some time looking through them and I'll photocopy the article for you. But you might be better-off asking around your area for some of the older copies from your friends. You need to read more about amps if you are planning on building one. There is much to learn! ....>>> Be Careful! <<<.... 73', John Dilks, K2TQN::::: john.dilks@academia.com From amsoft@epix.net Fri Aug 04 16:49:07 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!unixg.ubc.ca!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: ptaber@xis.xerox.COM (Pat Taber) Newsgroups: rec.radio.amateur.homebrew Subject: August QST CMOS keyer Date: 3 Aug 95 14:43:56 GMT Organization: ucsd usenet gateway Lines: 24 Message-ID: <9507038074.AA807468194@xis.xerox.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I guess I have a hard time seeing the difference between a construction article that specs a Curtis keyer chip and one that specs a preprogrammed microcontroller. You have to buy it from a single source and you don't get to know what goes into that one part of the project. I don't see that as invalidating the actual constuction involved or make the article less "pure" than any other. So the guy who makes the chip tells you how to use it. Big deal. We should be so unlucky as to have the makers of other devices provide simple projects that use them. What if Motorolla were to slip in an article on how to use their power transistors? Or if TI were to sneak in an easy DSP project? WHAT A NIGHTMARE! We Gotta stop this! We gotta write to our Drictors and ARRL HQ and prevent this! On the other hand, if I developed the code for a project like this, I wouldn't publish it either. Not just for the millions and billions of dollars I'd make selling the part to helpless little hams, but because then I'd be limiting the complexity of the project and thus the support problems. Stop those useful articles now! >>>==>PStJTT From amsoft@epix.net Fri Aug 04 16:49:08 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VARIALBE DC POWER SUPPLY Date: Thu, 03 Aug 95 14:48:12 GMT Organization: TSE Systems Lines: 43 Message-ID: <3vqnm3$dri@solaris.cc.vt.edu> References: <3v3321$p75@kasey.umkc.edu> <3vqlli$aqc@universe.digex.net> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us Keywords: power heat heatsink X-Newsreader: News Xpress Version 1.0 Beta #4 In article <3vqlli$aqc@universe.digex.net>, gc@universe.digex.net (Gary Chatters) wrote: >In article <3v3321$p75@kasey.umkc.edu>, JOHNSON wrote: >>I'd like to build a low-cost variable DC power supply that would produce >>4-40 volts DC at about 2amps. Could anyone help me with this project? >> > >When designing your power supply you must consider power dissipation >requirements. Voltage regulator ICs are quite easy to use, >but you must consider voltage and current AND power dissipation limits. > >For your requirements ( 4-40 VDC at 2 amps), suppose that the >voltage input to the regulator is 42 volts. Then the worst case >for power dissipation is (42 - 4 ) * 2 = 76 watts. That is a lot >of power to dissipate in a TO-3 case and will require a large heat >sink. I don't have my databooks here, so I am not sure that many >regulator ICs can even handle that much power. > >Many regulator ICs are capable of shutting down in case of thermal >overload, but external pass transistors aren't that smart. If a wide range is desired, the series regulator dissipation problem is often solved by making the input voltage to the regulator change according to the aproximate output desired. This is most often done by changing taps on the 60Hz transformer that feeds the rectifier/filter at the input to the regulator section. The supply would then have at least two ranges: "high", which applies about 42V to the input of the regulator, and "low" using about 21V. The switch that selects the transformer tap would also select part of the feedback resistor so the output voltage is only adjustable to values apropriate for that range (4-19V Low, 19-40V High). Automatic selection could also be implemented, using a relay and a voltage comparator on the output. This has the additional advantage of returning to "low" input when the output is overloaded. Worst case dissipation would occur when the lowest setting of the high range is used, for example 19V. Then you have 2*(42-19) = 46W, which is a considerable improvement, and probably low enough to use the regulator alone with a good heat sink but with no need for a pass transistor. In case of a shorted output on the high range, the regulator could overheat, but its internal protection would prevent damage. -Mike KD4QDM From amsoft@epix.net Fri Aug 04 16:49:10 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: SmillieK@imb.ic.gc.CA (Wilson-Smillie, Kimberley: IMB) Newsgroups: rec.radio.amateur.homebrew Subject: Internet address Date: 3 Aug 95 16:21:00 GMT Organization: ucsd usenet gateway Lines: 44 Message-ID: <3020B139@mssmtp.istc.ca> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu We do not have a valid internet address at Industry Canada for Tony Komljanec. Thank you Kimberley Wilson-Smillie Corporate E-Mail Services Industry Canada ---------- From: Mailer-Daemon To: Postmaster Subject: Returned mail: User unknown Date: Wednesday, August 02, 1995 9:58AM ----- Transcript of session follows ----- <<< HELO mail.ucsd.edu <<< MAIL From: <<< RCPT To: 550 ... User unknown <<< DATA ----- Message header follows ----- Return-Path: Received: from mail.ucsd.edu (ucsd.edu) by ic.gc.ca (5.x/SMI-4.1) id AA15686; Wed, 2 Aug 1995 09:58:08 -0400 Errors-To: ham-homebrew-relay@ucsd.edu Received: by mail.ucsd.edu; id EAA11641 sendmail 8.6.12/UCSD-2.2-sun Wed, 2 Aug 1995 04:30:29 -0700 for ham-homebrew-list Errors-To: ham-homebrew-relay@ucsd.edu Sender: ham-homebrew-relay@ucsd.edu Precedence: List Received: by mail.ucsd.edu; id EAA11632 sendmail 8.6.12/UCSD-2.2-sun Wed, 2 Aug 1995 04:30:26 -0700 for ham-homebrew-ddist Message-Id: <199508021130.EAA11632@mail.ucsd.edu> Date: Wed, 2 Aug 95 04:30:25 PDT From: Ham-Homebrew Mailing List and Newsgroup Errors-To: Ham-Homebrew-Errors@ucsd.edu Reply-To: Ham-Homebrew@ucsd.edu Precedence: List Subject: Ham-Homebrew Digest V95 #232 To: Ham-Homebrew@ucsd.edu From amsoft@epix.net Fri Aug 04 16:49:10 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!uchinews!ncar!noao!CS.Arizona.EDU!news.Arizona.EDU!usenet From: jmiller@eyes.arizona.edu (Joseph M. Miller, M.D.) Newsgroups: rec.radio.amateur.homebrew Subject: ATV newsgroup Date: Thu, 03 Aug 95 16:22:02 MST Organization: Dept. of Ophthalmology, University of Arizona Lines: 4 Message-ID: <3vrlq8$u38@news.ccit.arizona.edu> NNTP-Posting-Host: mred.eyes.arizona.edu Mime-Version: 1.0 X-Newsreader: WinVN 0.93.6 Is there a newsgroup where ATV is discussed? Can't seem to find one. Tnx joe KI7WV From amsoft@epix.net Fri Aug 04 16:49:11 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!uchinews!ncar!noao!CS.Arizona.EDU!news.Arizona.EDU!usenet From: jmiller@eyes.arizona.edu (Joseph M. Miller, M.D.) Newsgroups: rec.radio.amateur.homebrew Subject: ATV Newsgroup Date: Thu, 03 Aug 95 16:23:42 MST Organization: Dept. of Ophthalmology, University of Arizona Lines: 4 Message-ID: <3vrlt8$u38@news.ccit.arizona.edu> NNTP-Posting-Host: mred.eyes.arizona.edu Mime-Version: 1.0 X-Newsreader: WinVN 0.93.6 Is there an ATV newsgroup being discussed? Joe KI7WV From amsoft@epix.net Fri Aug 04 16:49:11 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!uchinews!ncar!noao!CS.Arizona.EDU!news.Arizona.EDU!usenet From: jmiller@eyes.arizona.edu (Joseph M. Miller, M.D.) Newsgroups: rec.radio.amateur.homebrew Subject: ATV Newsgroup Date: Thu, 03 Aug 95 16:24:38 MST Organization: Dept. of Ophthalmology, University of Arizona Lines: 4 Message-ID: <3vrluo$u38@news.ccit.arizona.edu> NNTP-Posting-Host: mred.eyes.arizona.edu Mime-Version: 1.0 X-Newsreader: WinVN 0.93.6 Is there an ATV newsgroup being discussed? Joe KI7WV From amsoft@epix.net Fri Aug 04 16:49:12 1995 Path: grape.epix.net!news.sprintlink.net!gatech!swrinde!sgigate.sgi.com!genmagic!bug.rahul.net!a2i!news.erinet.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!mgate.arrl.org!not-for-mail From: mtracy@mgate.arrl.org (Mike Tracy) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Cardwell Condensor Co. info Date: 3 Aug 1995 16:47:18 -0400 Organization: American Radio Relay League Lines: 23 Message-ID: <3vrckm$j77@mgate.arrl.org> References: <3vp296$2mv@acme.freenet.columbus.oh.us> NNTP-Posting-Host: mgate.arrl.org X-Newsreader: TIN [version 1.2 PL2] Sergei Kulyov (skulyov@freenet.columbus.oh.us) wrote: : Hi gang, : I'm looking for the address or fax of Cardwell Condensor Co. : which produced air vary capacitors. : 73! Sergei : AA8OT, UA3AP Cardwell Condenser Corporation 80 East Montauk Highway Lindenhurst, Long Island, NY 11757 Phone: 516-957-7200 Fax: 516-957-7203 Best Regards, Michael Tracy, KC1SX, ARRL Technical Information Services ------------------------------------------------------------------------- American Radio Relay League, Inc. Tel: 1-203-594-0200 225 Main Street Fax: 1-203-594-0259 Newington, CT 06111 Email: mtracy@arrl.org ------------------------------------------------------------------------- From amsoft@epix.net Fri Aug 04 16:49:13 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.dacom.co.kr!news.netins.net!news.netins.net!negaard From: negaard@draagen.graceland.edu (David Negaard (Oberon-)) Newsgroups: rec.radio.amateur.homebrew Subject: Optoisolator cross-reference help and PAL programming information Date: 03 Aug 1995 17:26:25 GMT Organization: INS Info Services, Des Moines, Iowa, USA Lines: 24 Distribution: world Message-ID: NNTP-Posting-Host: draagen.graceland.edu I'm working on building the OptoSCC card designed by Henk Penk, PA0HZP, and intended for use with a variety of digital-mode modems. I've got the schematic, and I've located all the parts I need except for the optoisolator chip. It's specified in the bill of materials as a PC847, and I can't find this chip or an equivalent. I've e-mailed PA0HZP, but he may not be able to respond for any of a variety of reasons, so I'll try here. Can anyone help? The other part of the project that's missing is the PAL used to decode the PC bus logic. It's a 20L10 and I can get the part, but I don't know how to program it. Maybe I'm confused, but one must program Programmable Array Logic, mustn't one? I expect that I could figure what the program ought to be, given enough time and energy, but I thought I'd pursue a solution with those wiser, first (I hope you're all wiser than me, else the state of homebrew may be serious ;->= ). Is there any help available for me out there? -- o David Negaard o negaard@graceland.edu o Help Desk Technician o http://www.graceland.edu/~negaard o 700 College Avenue o linux-phile o Lamoni, IA 50140 o 73 de KB0PXK From amsoft@epix.net Fri Aug 04 16:49:14 1995 Path: grape.epix.net!news.sprintlink.net!uunet!in1.uu.net!DIALix!not-for-mail From: daveb@perth.DIALix.oz.au (David Brooks) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dipper Date: 3 Aug 1995 18:04:38 +0800 Organization: DIALix Services, Perth, Australia. Lines: 45 Sender: daveb@perth.DIALix.oz.au Message-ID: <3vq6vm$56v$1@perth.DIALix.oz.au> References: <807232235snz@lfheller.demon.co.uk> NNTP-Posting-Host: daveb@perth.dialix.oz.au Leon Heller writes: >In article > kell@mpac.jsc.nasa.gov "Ted Kell" writes: >> Saturday, at a local Hamfest/fleamarket I purchased a dipper. This thing >> is old, the markings on the box mention a frequency range of 400 Kcps to >> 280Mcps. It appears to have had a number of owners, one in Beaumont, TX >> and a another with a VK call that are obvious. It still works tho, and >> still has all of its coils. I have a couple of questions about its use. >> I know about the use of a dipper to check the resonant frequency of L-C >> circuits. I also know about using one as frequency source. What other >> neat uses of a dipmeter are there? Also, this unit has a place for audio >> out. It came with an earplug, It may be dead, but the jack is still >> live. What is the audio out for? >With the dipper power off, they can often be used as a wavemeter. The audio >out might be from an RF detector, so you can hear the modulation when using >it as a wavemeter. >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. Couple of points more... 1. The dipper can function as a rather rough super-regenerative receiver using that audio output (there's no regen control - I did write "rough" :) 2. On my dipper at least, the frequency calibration changes slightly between used powered, as an oscillator, and un-powered, as an absorption wavemeter. The scale is calibrated as an oscillator. But I still reckon they're an excellent thing to have around: not the last word in accuracy (tune up your unknown circuit with the dipper oscillating, then bring in the dipper on your main receiver to measure the frequency exactly), but you can do a great deal with them, and they're cheap. A lot of "bang for your buck". -- David R. Brooks Tel/fax. +61 9 434 4280 "Government is not reason. It is not eloquence. It is a force. Like fire, a dangerous servant and a fearful master." - G. Washington From amsoft@epix.net Fri Aug 04 16:49:15 1995 Path: grape.epix.net!news.sprintlink.net!EU.net!uknet!SoNet!news From: Robert Clegg Newsgroups: rec.radio.amateur.homebrew Subject: Radio Module Required Date: 3 Aug 1995 18:31:50 GMT Organization: SoNet - The first Internet provider on the south coast Lines: 5 Message-ID: <3vr4mm$2fk@alpha.aladdin.co.uk> NNTP-Posting-Host: castle.aladdin.co.uk Wanted: M57737 P.A. Module for Yaesu FT-720R This is also used as a 25w P.A. For a lot of marine VHF tx/rx's Reply to castle@aladdin.co.uk Cash Waiting. From amsoft@epix.net Fri Aug 04 16:49:15 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!EU.net!uknet!SoNet!news From: Robert Clegg Newsgroups: rec.radio.amateur.homebrew Subject: Tranciever Wanted Date: 3 Aug 1995 18:34:32 GMT Organization: SoNet - The first Internet provider on the south coast Lines: 5 Message-ID: <3vr4ro$2fk@alpha.aladdin.co.uk> NNTP-Posting-Host: castle.aladdin.co.uk Urgently required, 2 metre/70cms dual band tranciever. NOT Handheld. Also 2 metre radio with SSB & minimum 25Watts RMS. Reply to castle@aladdin.co.uk From amsoft@epix.net Fri Aug 04 16:49:16 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hp-pcd!hpcvsnz!tomb From: tomb@lsid.hp.com (Tom Bruhns) Subject: Wire formulas Sender: news@hpcvsnz.cv.hp.com (News ) Message-ID: Date: Thu, 3 Aug 1995 18:56:54 GMT Nntp-Posting-Host: hplsnb.lsid.hp.com Organization: Hewlett-Packard X-Newsreader: TIN [version 1.1 PL9.4] Lines: 33 Thanks to Richard Arnold for posting the c program to help figure coil winding info. I noted he used a case statement to access tabular wire info. Here are a couple formulas that folk might find useful to calculate wire diameter and approximate resistance in ohms per 1000 feet at 20C, as an alternative to entering a table. The diameter formula is accurate to better than 0.1% (I doubt that manufacturing tolerances are ever this good), and the resistance error, a couple percent max for gauges from 0 to 30 or so, is about the same as a 5 degree C change in temperature (and it's almost dead on at 12 gauge), so should be fine for practical work. d = 10^(-.05035*g - 0.4884) r1000 = 10^(0.1*g - 1) where d = wire diameter in inches r1000 = resistance of 1000 feet of wire at 20C, in ohms g = AWG gauge number, from 0 to 40. You can substitute -1 for 00, -2 for 000, etc., to extend to even larger diameters. (I guess they might even be fine for gauges finer than 40, but the table in front of me doesn't go that fine.) (It always amazes me how simple the constants in the R1000 formula are!) 73, K7ITM From amsoft@epix.net Fri Aug 04 16:49:17 1995 Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!news.funet.fi!news.csc.fi!vyh.fi!raateland From: raateland@vyh.fi (Arjen Raateland) Newsgroups: rec.radio.amateur.homebrew Subject: August QST construction article wanted Date: 3 Aug 95 22:14:24 EET Organization: National Board of Waters and the Environment Lines: 28 Message-ID: <1995Aug3.221424@vyh.fi> NNTP-Posting-Host: vyh1.vyh.fi So there is all this commotion about a construction article in the August 1995 issue of QST that wasn't a construction article, but read this: I don't get QST, but today I received an IDIOM Press Super CMOS Keyer III that I ordered after I read about it on the QRP-L list. Guess what, the Tutorial/Operating manual refers to 'the construction article', but all that is included in the manual is the schematic, no details about construction. Well, having some experience with these kind of things, I don't expect much difficulty in putting the thing together, but if anybody has actually read the 'construction article' and found interesting details that would be good to be aware of before connecting the PC-board to anything else, I would very much like to know. I'm also interested to know what there is in the QST article about the workings of the keyer. I have the 1994 ARRL Handbook, wherein there is a description (construction article?) of the CMOS Super Keyer II. The local public library doesn't have QST, so I can't have a look at the article myself. --... ...-- -.. . --- .... ..--- --.. .- --.. Arjen Raateland, SAS Support Finnish Environment Agency Helsinki, Finland .-.-. -.- From amsoft@epix.net Fri Aug 04 16:49:18 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!swrinde!sdd.hp.com!night.primate.wisc.edu!newsspool.doit.wisc.edu!koala.uwec.edu!usenet From: dan drumm Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Dentron tuner (instruction / pay too much?) Date: 3 Aug 1995 22:31:10 GMT Organization: University of Wisconsin Eau Claire Lines: 30 Message-ID: <3vrine$q44@koala.uwec.edu> NNTP-Posting-Host: lilith.uwec.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; OSF1 V3.2 alpha) To: drumm@uwec.edu X-URL: news:rec.radio.amateur.equipment Xref: grape.epix.net rec.radio.amateur.equipment:15381 rec.radio.amateur.misc:84293 rec.radio.amateur.homebrew:8715 I bought a Dentron (model jr.) antenna tuner for $30.00 US. at a hamfest. Did I pay too much? I was going to use it with a heath HW100, -- now I know I also need an swr meter. oops, here comes yet another purchase. Nevertheless, I would gratefully pay cost + postage + thank-you-very-very-much for the photocoppied manual. Other than that, I would like to just get a quick overview on how to get up and running with the thing. It has one meter, and two knobs: (and no instructions): #1 transmitter match a,b,c,d,e,f... switch. #2 antenna match variable. The back has tx in, ant out, ballenced out, and unballenced out. any help greatly appreciated. If you have the manual, please contact me at drumm@uwec.edu. Thanks! Dan Drumm N9VOX Wishing you an extra hour each day! From amsoft@epix.net Fri Aug 04 16:49:19 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: steve6920@aol.com (Steve6920) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Re: Dentron tuner (instruction / pay too much Date: 3 Aug 1995 22:47:21 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 26 Sender: root@newsbf02.news.aol.com Message-ID: <3vs1np$i65@newsbf02.news.aol.com> References: <3vrine$q44@koala.uwec.edu> Reply-To: steve6920@aol.com (Steve6920) NNTP-Posting-Host: newsbf02.mail.aol.com Xref: grape.epix.net rec.radio.amateur.equipment:15390 rec.radio.amateur.misc:84307 rec.radio.amateur.homebrew:8723 Hi Dan, If that is the tuner I am thinking about, it has a meter on the front which indicates relative power (with a pot on the back to adjust sensitivity. I have used the Dentron tuners for several years (both the Jr. Tuner and the much larger MT-2000A. I haven't had one bit of problems with them. To operate the tuner, you set the bandswitch and then adjust both the transmitter and antenna capacitors for the best match. You can get a rough idea by adjusting for maximum background receiver noise. The settings will obviously change depending on the antenna you are using. The only rule of thumb is the lower the letter setting on the bandswitch, the more inductor you are switching in and the lower the operating frequency. The is a post on the back for the single wire antenna to which you would hook a long wire or random wire antenna. If you are using balanced feedline, you would put a jumper between the single wire post and one post of the balanced output. There should be a dotted line on the back indicating where this jumper should be placed. In addition, if you are using the tuner on low frequencies and have a hard time matching the antenna, you may want to put this jumper in as the addition of the balun in the circuit will help tune low frequency long wires. If you will verifiy you have the Jr. Monitor tuner, I have the manual and can copy it for you. You can send me E-mail with an address. 73's Steve From amsoft@epix.net Fri Aug 04 16:49:20 1995 Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!ncar!noao!news.Arizona.EDU!news.Cerritos.edu!nic-nac.CSU.net!charnel.ecst.csuchico.edu!csusac!csus.edu!netcom.com!dilligaf From: dilligaf@netcom.com (Jonas Grumby) Subject: Re: Anyone use and/or like the Ramsey TV-6 transmitter? Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: <3vp73l$7co@sonnet1.sonnet.com> Date: Thu, 3 Aug 1995 23:08:18 GMT Lines: 26 Sender: dilligaf@netcom21.netcom.com Xref: grape.epix.net alt.radio.pirate:9445 sci.electronics:138216 rec.radio.amateur.homebrew:8727 In article <3vp73l$7co@sonnet1.sonnet.com>, Wyatt Earp wrote: >I bought the Ramsey TV-6 kit and the LPA-1 1 watt amp with the hopes >of transmitting my cable box / VCR to all the TV's in the house and >not have to run coax. The kits went together with no problems, but >the performance from the TV-6 transmitter is nothing to brag about. I >have managed to get a crappy, rolling, wavy black and white picture >with some audio. Doesn't matter if I use the TV-6 kit alone with the >built in whip, an external 'dipole' of (2) 3.5 foot wires, or the >LPA-1 and the dipole. It is looking like this will never replace >running coax to every TV in the house. > >Thanks, > >Wyatt > I've had about the same luck with mine although I have noticed that some receivers work better than others. Also, I could sometimes tune in a decent picture but the audio would be terrible and vice versa. Oh well.. Jonas From amsoft@epix.net Fri Aug 04 16:49:21 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!holonet!colossus.holonet.net!minfox!jim.horner From: jim.horner@minfox.com (Jim Horner) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter Date: Fri, 4 Aug 1995 00:23:00 GMT Message-ID: <9508031906236221@minfox.com> Organization: MINFOX Courtenay, BC (604)-337-2023 Distribution: world References: <3vpd7v$sfb@insosf1.netins.net> <3vovg7$ju8@newsbf02.news.aol.com> Lines: 29 TK>pfzouave@aol.com (PFZouave) wrote: TK>:>It was my understanding that some segment of the longwave band had been TK>:>set aside for license-free experimentation, provided you stayed under a TK>:>Does any one know the rules regarding longwave experimentation? From the article "Ground Zero" (Popular Electronics-Oct.'94): 1750-Meter Experimenters' Band: - 160-190 kHz - Max. power-1watt - Max. antenna length-50 ft. including ground lead and transmission line - Modulation-any - Out of band emissions must be supressed by 20 dB. The article suggests the following publication for further info: (says it contains equiptment designs) LOW and MEDIUM FREQUENCY SCRAPBOOK from-Ken Cornell 225 Baltimore Ave., 107 pages Point Pleasant Beach, $18.75 first class mail NJ 08742 haven't seen it myself tho........ jim --- * OLX 2.1 TD * Use the mouse Luke -Obi Wan Gates- From amsoft@epix.net Fri Aug 04 16:49:21 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!vivanews.vivanet.com!mulveyr From: mulveyr@vivanet.vivanet.com (Rich Mulvey) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can Schems/Diags be Posted here? *.uue?? Date: 4 Aug 1995 01:01:19 GMT Organization: Mulvey Lines: 19 Message-ID: <3vrrgv$k6@vivanews.vivanet.com> References: <3vhpu2$ffg@pipe2.nyc.pipeline.com> Reply-To: mulveyr@vivanet.vivanet.com NNTP-Posting-Host: ip140.vivanet.com X-Newsreader: TIN [version 1.2 PL2] Anthony G. Catalano (acatalan@nyc.pipeline.com) wrote: : I wonder If we can post scanned drawings, scematics etc. in this newsgroup? : I would post them as an attached *.uue file that would have to : be uue-decoded back into a pcx or a gif file. : Anthony G. Catalano WW2W No, this is a discussion group, and it would be considered rude, especially since a large number of the people reading the group have to pay for every byte that passes through their modems. The generally approved method is to place the files on a public FTP site, and post a notice in the relevant group as to its availability. Thank you, however, for asking. A lot of people wouldn't have gone to the trouble. :-) - Rich From amsoft@epix.net Fri Aug 04 16:49:22 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!news.iadfw.net!usenet From: Gene Mason Newsgroups: rec.radio.amateur.homebrew Subject: Re: Good SPICE book Date: 4 Aug 1995 02:03:37 GMT Organization: Internet America Lines: 5 Message-ID: <3vrv5p$35p@news.iadfw.net> References: <3vopks$j7c@giant.seas.smu.edu> NNTP-Posting-Host: dal06-04.ppp.iadfw.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 32bit) To: scott@seas.smu.edu Hi...Try Borders books at Preston and Royal Ln...Saw several there recently.Also Book stop at Preston/Forest Ln, although the Book Stop at Town East has the best selection of technical books in Dallas...And don't ask me why! Maybe has to do with AT&T being close by. Good Luck... Gene From amsoft@epix.net Fri Aug 04 16:49:23 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: dayj@ozemail.COM.AU (JOHN DAY) Newsgroups: rec.radio.amateur.homebrew Subject: Farnell SSG-2000 - help needed Date: 4 Aug 95 03:02:46 GMT Organization: OzEmail Pty Ltd Lines: 18 Sender: JOHN DAY Message-ID: <1995AUG4.6980@ozemail.com.au> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Hi, I have a Farnell (UK) SSG-2000 synthesized signal generator which I want to control from the HPIB port. Does anyone have a user manual? All I need is the programming info, I do not need the whole thing. But -- It would be nice! John Day VK3ZJF dayj@ozemail.com.au or 100236,2364@Compuserve.com Fax +61-3-9543-7238 Snail: PO Box 206, Oakleigh VIC 3166, Australia From amsoft@epix.net Fri Aug 04 16:49:23 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: dayj@ozemail.COM.AU (JOHN DAY) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ham-Homebrew Digest V95 #231 Date: 4 Aug 95 03:02:47 GMT Organization: OzEmail Pty Ltd Lines: 16 Sender: JOHN DAY Message-ID: <1995AUG4.6982@ozemail.com.au> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Herb, You give no indication of where you are! In the USA call AMIDON ASSOCIATES in the Orange County (Santa Ana) area on (714)850-4660. They have the best range aorund. John Day VK3ZJF From amsoft@epix.net Fri Aug 04 16:49:25 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.moneng.mei.com!news.sol.net!solaria.mil.wi.us!garyk9gs From: garyk9gs@solaria.mil.wi.us (Gary Schwartz) Newsgroups: rec.radio.amateur.homebrew Subject: Another Project Idea! Date: 4 Aug 1995 05:46:30 GMT Organization: Solaria Public Access UNIX - Milwaukee, WI Lines: 34 Message-ID: <3vsc7n$5c2@hummin.sol.net> NNTP-Posting-Host: solaria.mil.wi.us X-Newsreader: TIN [version 1.2 PL1] Here's another project idea. I, like thousands of other hams, have one of those cheap MFJ dual clocks that never seems to be able to keep the correct time. Plus, I'm tired of having to reset it all the time. My idea is a clock that runs by itself, but gets its time set via the serial or parallel port of a PC. Perhaps the clock would reset itself to the computer time when the PC is first turned on and then once a day for those that leave their computer on all the time. Some might argue that the clock in a PC is notoriously innaccurate. While this is certainly true, there are several shareware programs available that will set the PC clock to WWV or the naval observatory via modem. I use one such program about once a week. The call costs about fifteen cents. The clock would have dual (12 hour local/24 hour UTC) displays (LCD). Anyone want to take up the challenge?? 73, Gary K9GS -- ________________________________________________________________ | | | Gary Schwartz K9GS E-Mail: garyk9gs@solaria.sol.net | | Society of Midwest Contesters Packet:K9GS@WA9KEC.WI.USA.NOAM | | Greater Milwaukee DX Association Member | |________________________________________________________________| From amsoft@epix.net Fri Aug 04 16:49:26 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!interlog.com!not-for-mail From: jefman@interlog.com (Jeff Mann) Newsgroups: rec.radio.amateur.homebrew Subject: Touch-tone DTMF interface to Macintosh needed Date: 4 Aug 1995 06:30:56 -0400 Organization: InterLog Internet Services (416) 975-2655 internet@interlog.com Lines: 19 Message-ID: <3vsst0$1dl@gold.interlog.com> NNTP-Posting-Host: gold.interlog.com Hi - has anyone built an interface to control a Macintosh computer through touch-tones? I want to be able to control a hypercard program remotely. Ideally it would work in software; I'd send the audio into the microphone input an analyse the tones. I have a program for the Mac that does this, but I can't access the data from it. It just prints the numbers to the screen. I've tried to contact the author, but no luck so far... btw, I'm using an AV mac which has a DSP chip built-in. Most likely I'll have to build a black box with a DTMF decoder chip in it, and send the output through the serial port. If anyone has done this, particularly to control Hypercard, I'd appreciate any advice. Thanks. NNTP-Posting-Host: ix-aus2-14.ix.netcom.com I'm looking for a DOS or Windows based draw/CAD program that includes electronic symbols like inductors, transformers, caps, resistors and tubes. Has anyone found one that allows resizing, rotation, "sticky" end points, vertical/horizontal alignment, etc? Niel - WA5VLZ From amsoft@epix.net Fri Aug 04 16:49:27 1995 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!ub!galileo.cc.rochester.edu!fermi.nsrl.rochester.edu!skulski From: skulski@fermi.nsrl.rochester.edu Subject: Looking for BUZ 332A specs/info. Message-ID: <1995Aug4.112218.1@fermi.nsrl.rochester.edu> Lines: 21 Sender: news@galileo.cc.rochester.edu Nntp-Posting-Host: nsrlc6.nsrl.rochester.edu Organization: Nuclear Structure Research Laboratory Date: 4 Aug 95 11:22:18 -0500 Lines: 21 Xref: grape.epix.net rec.radio.amateur.homebrew:8735 rec.radio.amateur.equipment:15404 Hi: I have got a broken DC power supply, whose only problem seems to be a blown BUZ 332A power FET transistor. I tried to either buy such a transistor, or to find a replacement, but weird enough I cannot find it in any catalog. I even asked my friend in Europe to check it for me, but he could find only BUZ 330 and BUZ 331. So, my questions are: 1. is there any US mail-order source, which would offer BUZ 332A? 2. what is the replacement for BUZ 332A (close replacement) ? 3. anybody knows the specs of BUZ 332A? Please e-mail to skulski@nsrl.rochester.edu Excuse me for taking bandwidth in this newsgroup. I could not locate any other newsgroup dealing with electronic parts, this one seemed to be the closest I could find. Thank you in advance for info. Wojtek From amsoft@epix.net Fri Aug 04 16:49:28 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.sprintlink.net!news.primenet.com!usenet From: n7tcf@primenet.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Another Project Idea! Date: 4 Aug 1995 12:38:53 GMT Organization: Primenet Lines: 22 Message-ID: <3vt4ct$cg1@nnrp2.primenet.com> References: <3vsc7n$5c2@hummin.sol.net> Reply-To: n7tcf@primenet.com NNTP-Posting-Host: ip003.phx.primenet.com X-Newsreader: IBM NewsReader/2 v1.2 In <3vsc7n$5c2@hummin.sol.net>, garyk9gs@solaria.mil.wi.us (Gary Schwartz) writes: >My idea is a clock that runs by itself, but gets its time set via the >serial or parallel port of a PC. Perhaps the clock would reset itself to >the computer time when the PC is first turned on and then once a day for >those that leave their computer on all the time. > >Some might argue that the clock in a PC is notoriously innaccurate. While >this is certainly true, there are several shareware programs available >that will set the PC clock to WWV or the naval observatory via modem. I >use one such program about once a week. The call costs about fifteen >cents. A good program to check out is Time Set availible on the Rancho Palo Verde bbs. I can't get to the number right now but e-mail me and I'll have it. The program dials NIST or the Naval Observatory. This is well done but not unusual. It also provides a sync pulse on one pin of the parallel port to allow other devices to be linked. I never realized the MFJ was so bad. I bought the Radio Shack 1-1/2" face digital clock, with 12/24 hour format. Easy to read, but bulky. I reset it about twice a year. Of course it may vary from unit to unit. Jim N7TCF From amsoft@epix.net Fri Aug 04 16:49:29 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!news.duke.edu!godot.cc.duq.edu!newsfeed.pitt.edu!uunet!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: Current balun Date: 4 Aug 1995 13:18:06 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 40 Sender: root@newsbf02.news.aol.com Message-ID: <3vtkoe$192@newsbf02.news.aol.com> References: <3vohvl$7n1@iii2.iii.net> Reply-To: w8jitom@aol.com (W8JI Tom) NNTP-Posting-Host: newsbf02.mail.aol.com >Well Murray, Do you expect the cable manufacturers to be : >Should they "know" what frequency your going to use their cable for? >Should they "know" what length to make your cable? >Should they "know" what power level your going to use? >Should they "know" what attenuation you consider adequate? >The torroid materials have a frequency range! >They have a finite power handling ability/volume! >They have finite attenuation characteristics. >Enough? >Tom Tom and Murray, That is very true. The problem of power handling can be simplified to the voltage across each bead and the heating of the bead at that voltage on that frequency. For example, one popular string of beads balun has an equivilent parallel impedance of 1500 ohms R in parallel with 1500 ohms XL. The resistance dissipates power, and while that balun may handle 1500 watts with a balanced 50 ohm termination, it certainly won't handle much power with a 500 ohm load or any antenna that has high voltage from the terminals to ground. I've found that if space is available it is much cheaper to use an air wound balun than beads, and the power handling and choking impedance can be made higher. Roy Lewallan posted some nice impedance data on baluns last month. It was good stuff. Tom sure said it. Too many applications with too many variables involved for one fits all product. 73 Tom From amsoft@epix.net Fri Aug 04 16:49:30 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Another Project Idea! Date: Fri, 04 Aug 95 14:09:31 GMT Organization: TSE Systems Lines: 37 Message-ID: <3vt9ok$a7r@solaris.cc.vt.edu> References: <3vsc7n$5c2@hummin.sol.net> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 In article <3vsc7n$5c2@hummin.sol.net>, garyk9gs@solaria.mil.wi.us (Gary Schwartz) wrote: [PC-settable clock idea snipped] >Some might argue that the clock in a PC is notoriously innaccurate. While >this is certainly true, there are several shareware programs available >that will set the PC clock to WWV or the naval observatory via modem. I >use one such program about once a week. The call costs about fifteen >cents. Why use the PC at all then? Build a modem into the clock! The Motorola MC 145444 (unfortunately listed for about $8 - $12, but still cheaper than a PC and modem) includes a DTMF dialer and a 300 baud modem. The chip uses 8 mA at 5V while active and can be shut down when not. Other companies make similar chips for "call-home" applications like this. There is a wide market for them considering devices like credit-card verifiers, utility meters, etc. You would probably need a relay/transformer to couple to the phone line, and likely some sort of FCC approval on the whole system. Then the clock's serial port would be an *output* of accurate time, which the PC could obtain from the clock any time it needs to, without incurring any phone cost. Also the clock could be taken anywhere, plugged into a phone line, and set itself without needing any other hardware. The reset process could occur on a weekly or monthly schedule, or when the user requests it by pressing a button on the clock. Another option would be to equip the clock with a serial port intended for input of the correct time from the PC as described, but also include in the clock's software a protocol to drive an external modem (such as an old Hayes Smartmodem 1200) to call in and get the time. Then you have clock+modem, rather than clock+modem+PC+software to do the same thing. So many choices... -Mike KD4QDM From amsoft@epix.net Fri Aug 04 16:49:31 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!by668 From: by668@FreeNet.Carleton.CA (Marc Buron) Subject: Want to build a power supply Message-ID: Sender: by668@freenet2.carleton.ca (Marc Buron) Organization: The National Capital FreeNet, Ottawa, Ontario, Canada Date: Fri, 4 Aug 1995 16:02:23 GMT Lines: 15 Hello, I want to build a 13.5 Vdc 20 Amp. I need someone to draw up the schematics and list of pieces, I know some of you will say that it would cost less to buy one but I already have many pieces that can probably be used, so if there's a genius in that field around, i'd love to hear from them... Thanks many times... Marc From amsoft@epix.net Fri Aug 04 16:49:31 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!unixg.ubc.ca!atha!rwa From: rwa@cs.athabascau.ca (Ross Alexander) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Another Project Idea! Date: 4 Aug 1995 17:37:02 GMT Organization: Athabasca University Lines: 30 Message-ID: <3vtlrv$9jm@aurora.cs.athabascau.ca> References: <3vsc7n$5c2@hummin.sol.net> <3vt4ct$cg1@nnrp2.primenet.com> NNTP-Posting-Host: aupair.cs.athabascau.ca X-Newsreader: NN version 6.5.0 #10 (NOV) n7tcf@primenet.com writes: >In <3vsc7n$5c2@hummin.sol.net>, garyk9gs@solaria.mil.wi.us (Gary Schwartz) writes: >>Some might argue that the clock in a PC is notoriously innaccurate. >>While this is certainly true, there are several shareware programs >>available that will set the PC clock to WWV or the naval observatory >>via modem. I use one such program about once a week. The call >>costs about fifteen cents. I run an NTP client on my pc (a clonebox 486), and as a result its clock is accurate to about +- 25 milliseconds at all times. That's one of the joys of running a un*x and having a PPP link to the internet :). See comp.protocols.time.ntp for more info. Without the NTP client, the pc gains two or three minutes a month and drifts wildly with temperature. > I never realized the MFJ was so bad. I bought the Radio Shack >1-1/2" face digital clock, with 12/24 hour format. Easy to read, but >bulky. I reset it about twice a year. Of course it may vary from unit >to unit. There must be a lot of variation; an MFJ here loses about 12 to 13 seconds a month, while a $20 timex watch (which has a 24 hour display format option) is only 50 seconds slow after two years. regards, Ross ve6pdq -- Ross Alexander, ve6pdq -- (403) 675 6311 -- rwa@cs.athabascau.ca From amsoft@epix.net Fri Aug 04 16:49:32 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.starnet.net!wupost!news.utdallas.edu!corpgate!crchh327.rich.bnr.ca!brtph500.bnr.ca!bcarh189.bnr.ca!bcarh8ab.bnr.ca!news From: ddenter@bnr.ca (Dean Denter) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Another Project Idea! Date: 4 Aug 1995 17:39:22 GMT Organization: Bell-Northern Research Ltd. Canada Lines: 38 Distribution: world Message-ID: <3vtm0a$h5n@bcarh8ab.bnr.ca> References: <3vsc7n$5c2@hummin.sol.net> Reply-To: ddenter@bnr.ca NNTP-Posting-Host: bcars862.bnr.ca In article 5c2@hummin.sol.net, garyk9gs@solaria.mil.wi.us (Gary Schwartz) writes: > >Here's another project idea. > >I, like thousands of other hams, have one of those cheap MFJ dual clocks >that never seems to be able to keep the correct time. Plus, I'm tired of >having to reset it all the time. > >My idea is a clock that runs by itself, but gets its time set via the >serial or parallel port of a PC. Perhaps the clock would reset itself to >the computer time when the PC is first turned on and then once a day for >those that leave their computer on all the time. > >Some might argue that the clock in a PC is notoriously innaccurate. While >this is certainly true, there are several shareware programs available >that will set the PC clock to WWV or the naval observatory via modem. I >use one such program about once a week. The call costs about fifteen >cents. > Why go to all this trouble, and then have to pay to update your clock? Last time I checked CHU (the Canadian version of WWV) output a data burst every minute or so for just this purpose. There was a project designed some time ago with receiver, decoder, and software for updating a machine running un*x. Last that I checked the schematics/instructions/etc were available on the local ham fileserver hydra.carleton.ca, somewhere in the anonymous ftp section. I haven't built this thing yet, so I can't comment on how well it works. regards, Dean. --- Dean Denter work -> ddenter@bnr.ca VA3CDD play -> af580@freenet.carleton.ca [[[[[[[[[[[[[[[[[[I speak only for myself]]]]]]]]]]]]]]]]]] From amsoft@epix.net Mon Aug 07 17:15:45 1995 Path: grape.epix.net!news.sprintlink.net!oronet!news From: rst-engr@oro.net (Jim Weir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: (no subject) Date: Sun, 06 Aug 1995 22:13:00 GMT Organization: RST Engineering Lines: 16 Message-ID: <403f3p$jkn@hg.oro.net> References: <3vohta$q63@gv-gate.gvg.tek.com> NNTP-Posting-Host: @rst-engr.oro.net X-Newsreader: Forte Free Agent v0.55 Grover Cleveland wrote: >Can someone please point me to the qrp mailing list? >73 de WT6P Well, migod, look who is on the 'net with the rest of us mortals!! Jim Weir VP Engineering | "I turned to my wife, as startled as the RST Engineering | pilot by what I'd seen. Dirt-streaked, Grass Valley CA 95945 | glorious, she smiled at me, tear-bright voice/fax 916/272-1432 | radiance. 'Richie, they're going to try rst-engr@oro.net | for it!' she said, "Wish them love!'" (Bach) From amsoft@epix.net Mon Aug 07 17:15:46 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!news.rmii.com!nexus.interealm.com!root From: wayne@nexus.interealm.com (wayne wicks) Newsgroups: rec.radio.amateur.homebrew Subject: 4-1000 Date: Sat, 05 Aug 1995 05:38:11 GMT Organization: ICG/MagNET (303) 745-9205 Lines: 4 Message-ID: <3vuvtb$s7t@nexus.interealm.com> Reply-To: wayne@nexus.interealm.com NNTP-Posting-Host: ppp202.interealm.com X-Newsreader: Forte Free Agent 1.0.82 Looking for a Good homebrew HF amp with 4-1000 finale/working. wa2kec wayne@nexus.interealm.com From amsoft@epix.net Mon Aug 07 17:15:47 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!news.rmii.com!newsjunkie.ans.net!news0.cybernetics.net!usenet From: coyote@cybernetics.net (Si Ballenger Slip >>>> PPP/Shell?) Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew Subject: Re: Anyone use and/or like the Ramsey TV-6 transmitter? Date: 5 Aug 1995 05:37:30 GMT Organization: Very little right now! Lines: 40 Message-ID: <3vv02q$t06@news0.cybernetics.net> References: <3vp73l$7co@sonnet1.sonnet.com> NNTP-Posting-Host: 204.148.32.22 X-Newsreader: News Xpress Version 1.0 Beta #4 Xref: grape.epix.net alt.radio.pirate:9472 sci.electronics:138377 rec.radio.amateur.homebrew:8746 In article , dilligaf@netcom.com (Jonas Grumby) wrote: >In article <3vp73l$7co@sonnet1.sonnet.com>, Wyatt Earp wrote: >>I bought the Ramsey TV-6 kit and the LPA-1 1 watt amp with the hopes >>of transmitting my cable box / VCR to all the TV's in the house and >>not have to run coax. The kits went together with no problems, but >>the performance from the TV-6 transmitter is nothing to brag about. I >>have managed to get a crappy, rolling, wavy black and white picture >>with some audio. Doesn't matter if I use the TV-6 kit alone with the >>built in whip, an external 'dipole' of (2) 3.5 foot wires, or the >>LPA-1 and the dipole. It is looking like this will never replace >>running coax to every TV in the house. >> > >>Thanks, >> >>Wyatt >> > >I've had about the same luck with mine although I have noticed >that some receivers work better than others. Also, I could >sometimes tune in a decent picture but the audio would be >terrible and vice versa. > >Oh well.. > >Jonas > A different approach to try is getting commercially made video transmitters. I bought one (actually 2, one to use and one to experiment with) from a dealer at a hamfest. It is different from the usual home video sender in that it transmits on channel 15, so it doesn't need a special reciever. It sends a nice clean signal from one end of the house to the other. I have a LPA-1 that I plan to build soon and see if the signal quality remains good when amplified. The name of this device is Nippon America Wireless Videosender WV-050. If anybody has already experimented with it, let me know. Radio is nice, but a picture is worth a thousand words! Si B. From amsoft@epix.net Mon Aug 07 17:15:49 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!winternet.com!news From: mklinger@subzero.winternet.com (Max Klingert) Newsgroups: alt.radio.pirate,sci.electronics,rec.radio.amateur.homebrew Subject: Re: Anyone use and/or like the Ramsey TV-6 transmitter? Date: 6 Aug 1995 19:41:25 GMT Organization: StarNet Communications, Inc Lines: 34 Message-ID: <4035t5$s20@blackice.winternet.com> References: <3vp73l$7co@sonnet1.sonnet.com> NNTP-Posting-Host: subzero.winternet.com Xref: grape.epix.net alt.radio.pirate:9488 sci.electronics:138558 rec.radio.amateur.homebrew:8775 In article , Jonas Grumby wrote: >In article <3vp73l$7co@sonnet1.sonnet.com>, Wyatt Earp wrote: >>I bought the Ramsey TV-6 kit and the LPA-1 1 watt amp with the hopes >>of transmitting my cable box / VCR to all the TV's in the house and >>not have to run coax. The kits went together with no problems, but >>the performance from the TV-6 transmitter is nothing to brag about. I >>have managed to get a crappy, rolling, wavy black and white picture >>with some audio. Doesn't matter if I use the TV-6 kit alone with the >>built in whip, an external 'dipole' of (2) 3.5 foot wires, or the >>LPA-1 and the dipole. It is looking like this will never replace >>running coax to every TV in the house. >> > >I've had about the same luck with mine although I have noticed >that some receivers work better than others. Also, I could >sometimes tune in a decent picture but the audio would be >terrible and vice versa. > I built 2 for my sister so she could have a couple of cameras in the barn to keep an eye on a couple of mares about to foal. Both worked over a good distance (100-150 feet) to an old B/W TV but I had to replace the coil on one to tune it to ch 6. All she needed was to see that something was about to happen, no need for good audio or video. While testing them at home, I had a hard time getting a really good picture with audio more than a few feet away. Things to try would be resoldering any suspect joints, making sure lead lengths are as short as possible and use a regulated supply. Batteries run down quickly. I also used a dipole for each "eyeballed" to the right freq. From my experience, I would say it isn't the way to distribute a good A/V signal over any distance.... Max mklinger@winternet.com From amsoft@epix.net Mon Aug 07 17:15:50 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!newshost.vvm.com!news From: coufal@vvm.com (Dwain Coufal) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can Schems/Diags be Posted here? *.uue?? Date: Mon, 07 Aug 1995 13:54:59 GMT Organization: VVM, Inc. Lines: 46 Message-ID: <4056g4$257@newshost.vvm.com> References: <3vhpu2$ffg@pipe2.nyc.pipeline.com> <3vrrgv$k6@vivanews.vivanet.com> NNTP-Posting-Host: slip2.vvm.com X-Newsreader: Forte Free Agent 1.0.82 mulveyr@vivanet.vivanet.com (Rich Mulvey) wrote: >Anthony G. Catalano (acatalan@nyc.pipeline.com) wrote: >: I wonder If we can post scanned drawings, scematics etc. in this newsgroup? >: I would post them as an attached *.uue file that would have to >: be uue-decoded back into a pcx or a gif file. >: Anthony G. Catalano WW2W > No, this is a discussion group, and it would be considered rude, >especially since a large number of the people reading the group have to >pay for every byte that passes through their modems. > The generally approved method is to place the files on a public >FTP site, and post a notice in the relevant group as to its >availability. > Thank you, however, for asking. A lot of people wouldn't have gone to >the trouble. :-) >- Rich I say it's time for a new newsgroup then. How about, rec.radio.amateur.homebrew.binary or something like that. Then the UUE files could be posted without *some* people thinking that it's "rude". Dwain ******************************************************************************* * Dwain A. Coufal The follwing is a list of far too many * * email addresses for just 1 person!!!!! * * preferred ---> (1) coufal@vvm.com * * (2) dwainc@netins.net * * Everything stated above is (3) 73261.3057@compuserve.com * * solely the opinion of my brain, (4) DwainC9757@aol.com * * and my body should not be held (5) GEnie address pending..... * * responsible. or, * * http://www.netins.net/showcase/bc/ * ******************************************************************************* * Is it the light at the end of the tunnel, or an oncoming train?! * ******************************************************************************* * It is always lightest just before the dark. * ******************************************************************************* From amsoft@epix.net Mon Aug 07 17:15:51 1995 Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!uunet!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: Current balun Date: 6 Aug 1995 13:08:51 +1000 Organization: DIALix Services, Brisbane, Australia. Lines: 39 Sender: mkelly@brisbane.DIALix.oz.au Message-ID: <401bo3$aer$1@brisbane.DIALix.oz.au> NNTP-Posting-Host: mkelly@brisbane.dialix.oz.au Keywords: Current , Balun Thanks, Tom Sefranek, for your reply. Obviously there is some confusion here, as we are talking apples and oranges. My fault for not explaining further perhaps? Just as old TV frame transformer ferrites are used for current baluns at RF even tho their resonant frequency is at 15KHz the resonance of EMI suppresive ferrites is mostly 'the lower, the better'. The technique already exists. There are RF suppressive computer cables available already and the extension to Coax is logical. The use of toroids is a poor solution really. The radius of the toroids have a direct relationship to the effectiveness of RF control. Halving the radius doubles the effect and to put ferrite right up on the outside skin ia as close as one can get. The other factor in toroids is the hight. In putting some ferrite in the plastic the height is as long as the feeder. Not just the last 2 feet. This would also have the benefit of increasing the surface area to allow for heat disipation under total mismatch. The need to go down from half inch to 1/4 inch coax to wind thru a frame or toroid would be removed and the heating of its dielectric and subsequent 'walking' of the center conductor removed. The feeder could be half inch all the way with no expensive toroids to buy/fit. To summarise: The frequency range would be all RF but the higher freqs. would be removed first. Power handling should be high with an 'average' run of say, 10 m. How much is 'enough'? Some is always better than none! I would just like to see RF suppression at HF and VHF of legal amateur powers for what should be a marginally more expensive coax than we buy at the moment. The ferrite powder is cheap. I know. I bought some. It is made for just this purpose - RF suppresion on PC cables. Think about it. And thanks for the come back. Murray Kelly. vk4aok. From amsoft@epix.net Mon Aug 07 17:15:53 1995 Path: grape.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!wem.org!steve6920 From: steve6920@wem.org (Steve6920) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dentron tuner (instruction / pay too much Date: Fri, 04 Aug 1995 02:47:21 GMT Message-ID: <1991734713-950803184721@wem.org> Organization: World Evangelist Ministry Distribution: world Lines: 34 From: steve6920@aol.com (Steve6920) Subject: Re: Dentron tuner (instruction / pay too much Hi Dan, If that is the tuner I am thinking about, it has a meter on the front which indicates relative power (with a pot on the back to adjust sensitivity. I have used the Dentron tuners for several years (both the Jr. Tuner and the much larger MT-2000A. I haven't had one bit of problems with them. To operate the tuner, you set the bandswitch and then adjust both the transmitter and antenna capacitors for the best match. You can get a rough idea by adjusting for maximum background receiver noise. The settings will obviously change depending on the antenna you are using. The only rule of thumb is the lower the letter setting on the bandswitch, the more inductor you are switching in and the lower the operating frequency. The is a post on the back for the single wire antenna to which you would hook a long wire or random wire antenna. If you are using balanced feedline, you would put a jumper between the single wire post and one post of the balanced output. There should be a dotted line on the back indicating where this jumper should be placed. In addition, if you are using the tuner on low frequencies and have a hard time matching the antenna, you may want to put this jumper in as the addition of the balun in the circuit will help tune low frequency long wires. If you will verifiy you have the Jr. Monitor tuner, I have the manual and can copy it for you. You can send me E-mail with an address. 73's Steve ------------------------------------------------------------------------- * ChristNET Global Christian Network Reaching the world with the Gospel * * Christ Connection World Headquarters Los Angeles, CA. (310) 398-7804 * ------------------------------------------------------------------------- From amsoft@epix.net Mon Aug 07 17:15:54 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!howland.reston.ans.net!xlink.net!news.ppp.de!news.Hanse.DE!mwhh!dk3uz!ehramm From: ehramm@dk3uz.hanse.de (Edmund H. Ramm) Subject: Re: Do vacuum tubes have shelf life? X-Newsreader: nn 6.4.18 Reply-To: ehramm@dk3uz.hanse.de Organization: Private Linux/68k site Message-ID: References: <3v9hah$1cu@clarknet.clark.net> <3vm0gq$t9c@news.vcd.hp.com> <1995Aug1.231541.14396@nosc.mil> Date: Fri, 4 Aug 1995 19:44:36 GMT Lines: 12 horowitz@nosc.mil (Alan M. Horowitz) writes: >Didn't tubes have lots of "getter" in them as well? Wonder what it was >made of? Magnesium or barium. 73, Eddi -- dk3uz@db0hht.ampr.org - ehramm@dk3uz.hanse.de - DK3UZ@DB0HHT.#HH.GER.EU Linux/m68k, the best U**x ever to hit an Atari! Distribution of this message via the Microsoft Network is prohibited From amsoft@epix.net Mon Aug 07 17:15:55 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!mksol!blair From: blair@mksol.dseg.ti.com (arthur blair) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Good SPICE book Date: 5 Aug 1995 20:52:19 GMT Organization: Texas Instruments Inc Lines: 22 Message-ID: <400lm3$or7@mksrv1.dseg.ti.com> References: <3vopks$j7c@giant.seas.smu.edu> <3vrv6f$35p@news.iadfw.net> NNTP-Posting-Host: mksol.dseg.ti.com X-Newsreader: TIN [version 1.2 PL2] Gene Mason (gmason@iadfw.net) wrote: : Hi...Try Borders books at Preston and Royal Ln...Saw several there : recently.Also Book stop at Preston/Forest Ln, although the Book Stop at : Town East has the best selection of technical books in Dallas...And don't : ask me why! Maybe has to do with AT&T being close by. Good Luck... Gene On SPICE books: The authors name is either banhaf or branhaf or something close. (Sorry, I dont have it here). It's a great book and a quick read. It's written for PSPICE, though. I dont know what platform the original poster uses. On DFW Bookstores: Check out Protech books (formerly taylors technical books) on beltline just east of prestonwood mall. Big tore, good selection, but full retail (ouch!). Art. -- "Television is chewing gum for the eyes" - Frank Lloyd Wright Dont forget to vote in news.announce.newgroups ! My views dont express those of my employer, etc., etc. From amsoft@epix.net Mon Aug 07 17:15:56 1995 Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon From: Leon Heller Newsgroups: rec.radio.amateur.homebrew Subject: Re: Good SPICE book Date: Sun, 06 Aug 95 10:19:33 GMT Organization: Home Lines: 24 Message-ID: <807704373snz@lfheller.demon.co.uk> References: <3vopks$j7c@giant.seas.smu.edu> <3vrv6f$35p@news.iadfw.net> <400lm3$or7@mksrv1.dseg.ti.com> Reply-To: Leon@lfheller.demon.co.uk X-NNTP-Posting-Host: lfheller.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 In article <400lm3$or7@mksrv1.dseg.ti.com> blair@mksol.dseg.ti.com "arthur blair" writes: > : Hi...Try Borders books at Preston and Royal Ln...Saw several there > : recently.Also Book stop at Preston/Forest Ln, although the Book Stop at > : Town East has the best selection of technical books in Dallas...And don't > : ask me why! Maybe has to do with AT&T being close by. Good Luck... Gene > > On SPICE books: > The authors name is either banhaf or branhaf or something close. (Sorry, > I dont have it here). It's a great book and a quick read. It's written > for PSPICE, though. I dont know what platform the original poster uses. I've got this book, I think it's pretty good as well. The author is Walter Banzhaf, in fact. It's called Computer-Aided Circuit Analysis Using SPICE, and is published by Prentice-Hall International. It's based on the PSPICE demo software, which is available via ftp from various places. Leon -- Leon Heller, G1HSM | "Do not adjust your mind, there is E-mail leon@lfheller.demon.co.uk | a fault in reality": on a wall Phone: +44 (0)1734 266679 | many years ago in Oxford. From amsoft@epix.net Mon Aug 07 17:15:57 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!simtel!news.kei.com!bloom-beacon.mit.edu!usc!howland.reston.ans.net!news.sprintlink.net!uunet!in2.uu.net!svc.portal.com!shell.portal.com!jobe.shell.portal.com!jkesling From: jkesling@shell.portal.com (John Darrell Kesling) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Good SPICE book Date: 7 Aug 1995 03:50:06 GMT Organization: Portal Communications Company -- 408/973-9111 (voice) 408/973-8091 (data) Lines: 16 Message-ID: <4042he$qd9@news1.shell> References: <3vopks$j7c@giant.seas.smu.edu> <3vrv6f$35p@news.iadfw.net> <400lm3$or7@mksrv1.dseg.ti.com> <807704373snz@lfheller.demon.co.uk> NNTP-Posting-Host: jobe.shell.portal.com X-Newsreader: TIN [version 1.2 PL2] I picked up a copy of "SPICE A Guide to Circuit Simulation & Analysis Using PSpice" second edition by Paul W. Tuinenga and published by Prentice Hall for $3.00 at one of those discount bookstores that pop up in vacant store fronts. It's copyright 1992 but answered a couple of questions on the first scan though. John -- ------------------------------------------------------------------------------ John Kesling - jkesling@eng.utoledo.edu or jkesling@shell.portal.com ------------------------------------------------------------------------------ WA8ZGO - via AX.25 packet radio WA8ZGO@W8HHF.OH.USA ------------------------------------------------------------------------------ From amsoft@epix.net Mon Aug 07 17:15:58 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: athena1106@aol.com (Athena1106) Newsgroups: rec.radio.amateur.homebrew Subject: Re: help needed with Colpits Osc. Date: 5 Aug 1995 17:24:13 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 1 Sender: root@newsbf02.news.aol.com Message-ID: <400nht$qc2@newsbf02.news.aol.com> References: <3uvpqj$4e8@news.cict.fr> Reply-To: athena1106@aol.com (Athena1106) NNTP-Posting-Host: newsbf02.mail.aol.com Make sure you have the right pins in the right place From amsoft@epix.net Mon Aug 07 17:15:59 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uunet!in2.uu.net!news.eng.convex.com!cowart From: cowart@news.eng.convex.com (Michael Cowart) Newsgroups: rec.radio.amateur.homebrew Subject: HELP: need 6LQ6! Date: 7 Aug 1995 15:14:30 GMT Organization: Engineering, Convex Computer Corporation, Richardson, Tx USA Lines: 24 Message-ID: <405akm$dfj@worm.convex.com> NNTP-Posting-Host: neptune.convex.com X-Newsreader: TIN [version 1.2 PL2] [ Article crossposted from rec.radio.amateur.equipment ] [ Author was Michael Cowart ] [ Posted on 7 Aug 1995 15:12:40 GMT ] need four 6LQ6's for sweep tube amp, Dentron GLA-1000. Mike (214) 497-3029 day (214) 840-8667 night -- ----------------------------------------------------------------- Mike Cowart e-mail: cowart@convex.com Convex Computer Corp. My opinions are mine, not my employer's. Richardson, Texas ----------------------------------------------------------------- -- ----------------------------------------------------------------- Mike Cowart e-mail: cowart@convex.com Convex Computer Corp. My opinions are mine, not my employer's. Richardson, Texas ----------------------------------------------------------------- From amsoft@epix.net Mon Aug 07 17:16:00 1995 Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!tank.news.pipex.net!pipex!howland.reston.ans.net!ix.netcom.com!netnews From: ultravis@ix.netcom.com (Guy Scott ) Newsgroups: rec.radio.amateur.homebrew Subject: Info. on Palomar Date: 5 Aug 1995 11:51:36 GMT Organization: Netcom Lines: 11 Message-ID: <3vvm08$atg@ixnews3.ix.netcom.com> NNTP-Posting-Host: ix-wpb-fl1-28.ix.netcom.com Hi all, just looking for some information on a company called palomar which makes amps (Possible cb?) I've just received a 150 watt amp which they make and would like to give it a good going over before even considering its use for 10m. The Model #is tx-150. Thanks for any help! PS. Yes I know its a cb amp, but given my financial situation that makes this unit as good as gold to me anyway! Henry (Ke4wbw) From amsoft@epix.net Mon Aug 07 17:16:01 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in1.uu.net!pipeline!not-for-mail From: acatalan@nyc.pipeline.com (Anthony G. Catalano) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter Date: 6 Aug 1995 04:40:58 -0400 Organization: The Pipeline Lines: 46 Message-ID: <401v6q$go0@pipe2.nyc.pipeline.com> References: <9508031906236221@minfox.com> NNTP-Posting-Host: pipe2.nyc.pipeline.com X-Newsreader: The Pipeline v3.1.1 On Fri, 4 Aug 1995 in article , 'jim.horner@minfox.com (Jim Horner)' wrote: >From the article "Ground Zero" (Popular Electronics-Oct.'94): > >1750-Meter Experimenters' Band: >- 160-190 kHz - Max. power-1watt >- Max. antenna length-50 ft. including ground lead and transmission line ---------------------------------------------------------------------- I don't care what THAT book said. It was either a misprint or a typo on your part.... because I respectfully must imform all that the limit of the combined feedline and antenna system for transmitting can only be a maximum of 15 (fifteen) feet. If you live near salt water, use it as a ground and place the x-mitter directly at the base of the antenna. The vertical portion would then be 15 feet ( constructed with a copper ribbon/tubing or multi-wire to compensate for R-loss) with a large capacity hat to bring the resonance down as far as possible without having the outer perimeter of the capacity hat fall below 20% of the vertical portion of the antennas' vertical mast Out of the 1 watt input to the antenna, consider yourself lucky if 50 milliwatts remain as the radiated portion. A cold winter night is the best time to recieve VLF signals because of the few static crashes. I remember reading about a small identifying paper having to be affixed to the transmitter with pertinent information on it. I will try to find the article/book that I had read that from. If ANYONE get a VLF transmitter on the air or would like to post a list of vlf xmitters that you can hear well please post it here. I'm sure 99.999 percent of that stuff is homebrew. It is also interesting that you literally can make up your own callsign/id on there (trying not to duplicate an existing one) If you are allready a ham you can use your call as it is very unlikely that it is allready being used on vlf! Most IDs are 3 letters in lenght in the entire vlf band. A good idea for a vlf keyer would be a keyer that IDs with a qso number that changes every day so you can be sure that qsl report is a genuine one and get a good picture of propagation... I have also noticed that the vlf signals are all continuous AM keyed with the identifying audio. Enjoy. Anthony G. Catalano WW2W //"nothing is foolproof because fools are so ingenious!" - unknown From amsoft@epix.net Mon Aug 07 17:16:02 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!nic-nac.CSU.net!csulb.edu!info.ucla.edu!nnrp.info.ucla.edu!MVS.OAC.UCLA.EDU!OSYSMAS From: OSYSMAS@MVS.OAC.UCLA.EDU (Michael Stein) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter Date: Sun, 06 Aug 1995 10:53 Organization: University of California, Los Angeles Lines: 13 Sender: MVS NNTP News Reader Message-ID: <19950806105342OSYSMAS@MVS.OAC.UCLA.EDU> References: <401v6q$go0@pipe2.nyc.pipeline.com> Reply-To: osysmas@mvs.oac.ucla.edu NNTP-Posting-Host: mvs.oac.ucla.edu >because I respectfully must imform all that the limit of the >combined feedline and antenna system for transmitting can only >be a maximum of 15 (fifteen) feet. 15 meters not feet. >It is also interesting that you literally can make up your own >callsign/id on there (trying not to duplicate an existing one) >If you are allready a ham you can use your call as it is very >unlikely that it is allready being used on vlf! I wouldn't use an amateur call as the transmissions are clearly out of any amateur band. From amsoft@epix.net Mon Aug 07 17:16:05 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!bloom-beacon.mit.edu!news.moneng.mei.com!uwm.edu!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!eastnews1.East.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter Date: 6 Aug 1995 18:46:10 GMT Organization: SunSoft South, Los Angeles, CA Lines: 64 Message-ID: <4032li$d8v@abyss.West.Sun.COM> References: <9508031906236221@minfox.com> <401v6q$go0@pipe2.nyc.pipeline.com> NNTP-Posting-Host: sunspot.west.sun.com In article <401v6q$go0@pipe2.nyc.pipeline.com>, Anthony G. Catalano wrote: >On Fri, 4 Aug 1995 in article , >'jim.horner@minfox.com (Jim Horner)' wrote: > > >>From the article "Ground Zero" (Popular Electronics-Oct.'94): >> >>1750-Meter Experimenters' Band: >>- 160-190 kHz - Max. power-1watt >>- Max. antenna length-50 ft. including ground lead and transmission line >---------------------------------------------------------------------- >I don't care what THAT book said. It was either a misprint or a typo on >your part.... >because I respectfully must imform all that the limit of the combined >feedline and antenna >system for transmitting can only be a maximum of 15 (fifteen) feet. Where did you get this restriction? You'd better get the Code of Federal Regulations updated, too, since it also contains the same "misprint". Just so you can check on this, have a look at Title 47 of the Code of Federal Regulations, Part 15. >If you live near salt water, use it as a ground and place the x-mitter >directly at >the base of the antenna. The vertical portion would then be 15 feet ( >constructed with a copper ribbon/tubing or multi-wire to compensate for >R-loss) with a large capacity hat to bring the resonance down as far as >possible without having the outer perimeter of the capacity hat fall below >20% of the vertical portion of the antennas' vertical mast >Out of the 1 watt input to the antenna, consider yourself lucky if 50 >milliwatts remain as the radiated portion. A cold winter night is the best >time to recieve VLF signals because of the few static crashes. > I remember reading about a small identifying paper having to be affixed >to the transmitter >with pertinent information on it. I will try to find the article/book that >I had read that from. >If ANYONE get a VLF transmitter on the air or would like to post a list of >vlf xmitters >that you can hear well please post it here. I'm sure 99.999 percent of that >stuff is homebrew. >It is also interesting that you literally can make up your own callsign/id >on there (trying not to duplicate an existing one) If you are allready a >ham you can use your call as it is very unlikely >that it is allready being used on vlf! Most IDs are 3 letters in lenght in >the entire vlf band. You aren't allowed to a callsign which has been or could be issued by the FCC, such as an amateur callsign. Maybe you'd better that mistake in Part 15 fixed, also. >Enjoy. Anthony G. Catalano WW2W //"nothing is foolproof because fools are >so ingenious!" - unknown The irony of your quote darn near killed me. ;-) -- * 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 amsoft@epix.net Mon Aug 07 17:16:06 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!pipeline!not-for-mail From: acatalan@nyc.pipeline.com (Anthony G. Catalano) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter ['lowfer' band] Date: 6 Aug 1995 04:46:42 -0400 Organization: The Pipeline Lines: 19 Message-ID: <401vhi$gpk@pipe2.nyc.pipeline.com> References: NNTP-Posting-Host: pipe2.nyc.pipeline.com X-Newsreader: The Pipeline v3.1.1 On 03 Aug 1995 in article , 'tvr@les.CNMAT.Berkeley.EDU (Tovar)' wrote: >My recent poking around the Internet has let me to conclude that 1750 meters >is governed by Part 15: > >Sec. 15.217 Operation in the band 160-190 kHz. > >(a) The total input power to the final radio frequency stage >(exclusive of filament or heater power) shall not exceed one watt. >(b) The total length of the transmission line, antenna, and >ground lead (if used) shall not exceed 15 meters. Can you please check if it is 15 feet or meters? 15 meters is about 30 feet, I doubt that they would allow that height. hmmmm this just gets curioser and curiouser.... Anthony Catalano WW2W From amsoft@epix.net Mon Aug 07 17:16:08 1995 Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter ['lowfer' band] Date: Sun, 06 Aug 95 15:32:56 GMT Organization: TSE Systems Lines: 42 Message-ID: <402nb4$50q@solaris.cc.vt.edu> References: <401vhi$gpk@pipe2.nyc.pipeline.com> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 In article <401vhi$gpk@pipe2.nyc.pipeline.com>, acatalan@nyc.pipeline.com (Anthony G. Catalano) wrote: >On 03 Aug 1995 in article , >'tvr@les.CNMAT.Berkeley.EDU (Tovar)' wrote: > > >>My recent poking around the Internet has let me to conclude that 1750 >meters >>is governed by Part 15: >> >>Sec. 15.217 Operation in the band 160-190 kHz. >> >>(a) The total input power to the final radio frequency stage >>(exclusive of filament or heater power) shall not exceed one watt. >>(b) The total length of the transmission line, antenna, and >>ground lead (if used) shall not exceed 15 meters. > >Can you please check if it is 15 feet or meters? >15 meters is about 30 feet, I doubt that they would allow that height. 1 foot = 0.3048 meter (or 1 meter = 3.28 feet) So 15 meters is 49.2 feet, which matches reasonably well with "50 feet" quoted in other sources. How about a 49 foot cube of ferrite, with several turns of heavy copper ribbon around it, then tuned to resonance with a BFC? Or does the regulation permit only vertical antennas, no loops? >hmmmm this just gets curioser and curiouser.... >Anthony Catalano WW2W I'd like to learn more as well. Is the Part 15 you quoted on-line somewhere, or will I have to walk 3 blocks to the library and read it from paper? -Mike KD4QDM From amsoft@epix.net Mon Aug 07 17:16:09 1995 Path: grape.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!woodybbs!1-124-6518-0!morgan.ali From: Morgan.Ali@f6518.n124.z1.fidonet.org (Morgan Ali) Date: 03 Aug 95 14:58:00 Newsgroups: rec.radio.amateur.homebrew Subject: Looking for gears for Tempo Message-ID: <443_9508050655@woodybbs.com> X-FTN-To: UUCP Organization: WoodyWare Software, Inc. Lines: 7 you can always retro fit some or make a new switch all together :) -- |Fidonet: Morgan Ali 1:124/6518 |Internet: Morgan.Ali@f6518.n124.z1.fidonet.org | | Standard disclaimer: The views of this user are strictly his own. From amsoft@epix.net Mon Aug 07 17:16:10 1995 Path: grape.epix.net!news.sprintlink.net!i-2000.com!usenet From: daved@i-2000.com Newsgroups: rec.radio.amateur.homebrew Subject: looking for plans: CB base antenna Date: Sun, 06 Aug 1995 21:54:38 GMT Organization: I-2000 Inc. - Internet Services Lines: 6 Message-ID: <40335t$15v@i-2000.com> NNTP-Posting-Host: riverhead1.access1.dh.i-2000.net X-Newsreader: Forte Free Agent 1.0.82 My young nephew got an old 23 channel CB and power supply at a yard sale. He is looking for an antenna but his funds are limited. Does anyone have, or know where I can get plans for a simple ground plane? Construction from copper pipe or tensioned wire is what I am thinking of. I think he would enjoy making the antenna more than saving to buy one. Any suggestions appreciated. From amsoft@epix.net Mon Aug 07 17:16:10 1995 Path: grape.epix.net!news.sprintlink.net!news.connect.net!usenet From: daveb@connect.net (David Bengtson) Newsgroups: sci.electronics,rec.radio.amateur.homebrew Subject: Modulating VCO's Date: Sun, 06 Aug 1995 05:06:08 GMT Organization: Connection Technologies Lines: 11 Message-ID: <401inl$qkr@dallas1.connect.net> NNTP-Posting-Host: a1p13.connect.net X-Newsreader: Forte Free Agent 1.0.82 Xref: grape.epix.net sci.electronics:138509 rec.radio.amateur.homebrew:8760 I'm looking for some pointers to detailed work on modulating vco's and synthesizers for transmitters. I'm specificaly looking for more information on Dual port modulation for FSK data. Technical reports are fine, application notes, etc. Thanks for any pointers David Bengtson Yes, these are my opinions Looking for Old HP-41 Calculators and Accessories From amsoft@epix.net Mon Aug 07 17:16:12 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!uunet!in1.uu.net!noc.near.net!news3.near.net!emba-news.uvm.edu!moose.uvm.edu!ajcummin From: ajcummin@moose.uvm.edu (Aaron Cummings) Subject: Re: Optoisolator cross-reference help and PAL programming information Message-ID: <1995Aug5.022643.17726@emba.uvm.edu> Sender: news@emba.uvm.edu Organization: EMBA Computer Facility, University of Vermont X-Newsreader: TIN [version 1.2 PL2] References: Date: Sat, 5 Aug 1995 02:26:43 GMT Lines: 43 David Negaard (Oberon-) (negaard@draagen.graceland.edu) wrote: : I'm working on building the OptoSCC card designed by Henk Penk, : PA0HZP, and intended for use with a variety of digital-mode modems. : I've got the schematic, and I've located all the parts I need except : for the optoisolator chip. It's specified in the bill of materials as : a PC847, and I can't find this chip or an equivalent. I've e-mailed : PA0HZP, but he may not be able to respond for any of a variety of : reasons, so I'll try here. Can anyone help? By looking at the schematic, you should be able to determine what you need for an optoisolator - I'm guessing that it is nothing too exotic, probably just a bipolar output...T.I. makes several, check your Digi_key catalog. : The other part of the project that's missing is the PAL used to decode : the PC bus logic. It's a 20L10 and I can get the part, but I don't : know how to program it. Maybe I'm confused, but one must program : Programmable Array Logic, mustn't one? Yes, you will need to program the PAL, and it is not a trivial process. Tools exist for developing PAL programs, but they cost $$ - Can you get away with just using logic gates??? : I expect that I could figure what the program ought to be, given : enough time and energy, but I thought I'd pursue a solution with those : wiser, first (I hope you're all wiser than me, else the state of : homebrew may be serious ;->= ). : Is there any help available for me out there? : -- : o David Negaard o negaard@graceland.edu : o Help Desk Technician o http://www.graceland.edu/~negaard : o 700 College Avenue o linux-phile : o Lamoni, IA 50140 o 73 de KB0PXK -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Aaron Cummings "A little nonsense now and then is Colchester, VT cherished by the wisest man..." ajcummin@moose.uvm.edu -Willie Wonkka KA1PYK =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= From amsoft@epix.net Mon Aug 07 17:16:13 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!simtel!news.kei.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.sprintlink.net!cc.iu.net!news From: wnewkirk@iu.net (Bill Newkirk) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QEX Magazine Date: 7 Aug 1995 03:52:39 GMT Organization: Space Coast Amateur Technical Group Lines: 22 Message-ID: <4042m7$2a2@cc.iu.net> References: <3vm17a$kn7@vesta.chch.planet.co.nz> <3vmuoo$29j@news.zeelandnet.nl> Reply-To: wnewkirk@iu.net (Bill Newkirk) NNTP-Posting-Host: netport-28.iu.net X-Newsreader: IBM NewsReader/2 v1.09 In <3vmuoo$29j@news.zeelandnet.nl>, hremijn@zeelandnet.nl (Henk Remijn) writes: >In <3vm17a$kn7@vesta.chch.planet.co.nz>, jonw@chch.planet.co.nz (Jonathon Woodward) writes: >>I am looking for the address and fax number of QEX magazine so I can >>subscribe. I am particularly interested in an article published in the >>June 1993 edition on measuring SINAD with DSP. >>Any help would be appreciated. >>Cheers Jonathan >QEX is published by the ARRL, I guess you can find their address somewhere. >Henk >Henk Remijn Systems engineer at >PA3EOB (JO11WM) Cargill Wet Milling ARRL phone: (203) 594-0200 (also a new area code in the near future as well) fax numbers: (203) 594-0259 and (203) 594-0298. the area code is supposed to change to (860) later in the year. 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 amsoft@epix.net Mon Aug 07 17:16:14 1995 Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!lyra.csx.cam.ac.uk!pmms.cam.ac.uk!andrew From: andrew@pmms.cam.ac.uk (Andrew Thomason) Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Subject: Rotary encoders Date: 7 Aug 1995 12:35:47 GMT Organization: DPMMS (Cambridge University - Pure Maths and Mathematical Statistics) Lines: 10 Distribution: world Message-ID: <4051b3$hf6@lyra.csx.cam.ac.uk> NNTP-Posting-Host: owl.pmms.cam.ac.uk Xref: grape.epix.net rec.radio.amateur.homebrew:8783 rec.radio.shortwave:56662 rec.radio.amateur.digital.misc:9922 sci.electronics:138624 Do rotary encoders "go off" after a year or so? Can they be repaired? Do they lose their magnetism or is it just dust which gets inside? I have a couple of digital radios which can be tuned by a knob, one cheap, one expensive. In both cases, after a year's use, the frequency started to dither around slightly whilst I smoothly turned the knob. I had thought this was due to a brain-damaged chip but now think it must be the rotary encoder. Many thanks, Andrew Thomason (andrew@dpmms.cam.ac.uk) From amsoft@epix.net Mon Aug 07 17:16:14 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!hookup!multiverse!199.218.112.130!sam From: sam@colossus (Sam Goldwasser) Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Subject: Re: Rotary encoders Date: 07 Aug 1995 13:35:02 GMT Organization: Multiverse Lines: 19 Distribution: world Message-ID: References: <4051b3$hf6@lyra.csx.cam.ac.uk> NNTP-Posting-Host: central.picker.com In-reply-to: andrew@pmms.cam.ac.uk's message of 7 Aug 1995 12:35:47 GMT Xref: grape.epix.net rec.radio.amateur.homebrew:8785 rec.radio.shortwave:56672 rec.radio.amateur.digital.misc:9924 sci.electronics:138630 In article <4051b3$hf6@lyra.csx.cam.ac.uk> andrew@pmms.cam.ac.uk (Andrew Thomason) writes: > Do rotary encoders "go off" after a year or so? Can they be repaired? Do they lose > their magnetism or is it just dust which gets inside? > I have a couple of digital radios which can be tuned by a knob, one cheap, one > expensive. In both cases, after a year's use, the frequency started to dither > around slightly whilst I smoothly turned the knob. I had thought this was due > to a brain-damaged chip but now think it must be the rotary encoder. > Many thanks, > Andrew Thomason (andrew@dpmms.cam.ac.uk) They should not. You may have really cheap encoders - mechanical contacts rather than optical or magnetic design. These can be cleaned if you can get at them. The other types should last a long time. --- sam From amsoft@epix.net Mon Aug 07 17:16:15 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!simtel!news.kei.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.sprintlink.net!cc.iu.net!news From: wnewkirk@iu.net (Bill Newkirk) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematic Draw Program Recommendations? Date: 7 Aug 1995 03:56:49 GMT Organization: Space Coast Amateur Technical Group Lines: 24 Message-ID: <4042u1$2a2@cc.iu.net> References: <3vsrso$m7a@ixnews3.ix.netcom.com> Reply-To: wnewkirk@iu.net (Bill Newkirk) NNTP-Posting-Host: netport-28.iu.net X-Newsreader: IBM NewsReader/2 v1.09 In <3vsrso$m7a@ixnews3.ix.netcom.com>, nielw@ix.netcom.com (Niel Wiegand) writes: >I'm looking for a DOS or Windows based draw/CAD program that includes >electronic symbols like inductors, transformers, caps, resistors and >tubes. >Has anyone found one that allows resizing, rotation, "sticky" end >points, vertical/horizontal alignment, etc? >Niel - WA5VLZ sounds like Autocad to the rescue here...of course it'd be better if you could kick out a net list to feed other analysis tools...but you said dos/windows, not unix. one hint. do all the work with a standard parts library and then do any resizing at plot time. the computer and your postscript laser printer are better at this than trying to draw every part to a different scale just so the completed circuit fits the screen or paper. most programs will have some form of scale function in the output routines that affects the output only and frees you from having to ever worry about that. 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 amsoft@epix.net Mon Aug 07 17:16:17 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!EU.net!howland.reston.ans.net!gatech!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Schematic Draw Program Recommendations? Message-ID: <1995Aug7.155511.19151@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <3vsrso$m7a@ixnews3.ix.netcom.com> <4042u1$2a2@cc.iu.net> Date: Mon, 7 Aug 1995 15:55:11 GMT Lines: 33 In article <4042u1$2a2@cc.iu.net> wnewkirk@iu.net (Bill Newkirk) writes: >In <3vsrso$m7a@ixnews3.ix.netcom.com>, nielw@ix.netcom.com (Niel Wiegand) writes: >>I'm looking for a DOS or Windows based draw/CAD program that includes >>electronic symbols like inductors, transformers, caps, resistors and >>tubes. >>Has anyone found one that allows resizing, rotation, "sticky" end >>points, vertical/horizontal alignment, etc? >>Niel - WA5VLZ > >sounds like Autocad to the rescue here...of course it'd be better if you could >kick out a net list to feed other analysis tools...but you said dos/windows, >not unix. Sounds like Orcad to the rescue here. :-) It's much easier to use than Autocad for schematics, outputs a netlist compatable with a number of autorouters, etc. The only drawback is that it isn't cheap, but then neither is Autocad. A cheaper program is Supercad. It has most of the drawing features of Orcad, but for only $99. It isn't as good for complex designs, though, because it won't work with a hierarchy of sheets, won't auto-number parts, make bills of materials, etc, but it is adequate for most amateur projects. An ideal setup is Orcad as a frontend for Pcad. *Now* you're talking bucks, but it automates almost all of the tedium of translating an idea to a schematic and circuit board layout. 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 amsoft@epix.net Mon Aug 07 17:16:17 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!news.bu.edu!olivea!venus.sun.com!nntp-hub2.barrnet.net!news.Stanford.EDU!morrow.stanford.edu!morrow.stanford.edu!not-for-mail From: Stephen.Parry@forsythe.stanford.edu (Stephen Parry) Newsgroups: rec.radio.amateur.homebrew Subject: stainless/titanium wire source Date: 7 Aug 1995 08:01:50 -0700 Organization: Stanford University Lines: 5 Sender: nobody@morrow.stanford.edu Message-ID: <4059su$mtf@morrow.stanford.edu> NNTP-Posting-Host: morrow.stanford.edu Does anyone know a source for stainless steel, or even better titanium, uninsulated wire in small quantities? I'm looking for something around 20 AWG. Stephen From amsoft@epix.net Mon Aug 07 17:16:18 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!hookup!usenet.eel.ufl.edu!gatech!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!sunrise.gv.ssi1.com!oronet!news From: rst-engr@oro.net (Jim Weir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: stainless/titanium wire source Date: Mon, 07 Aug 1995 16:22:30 GMT Organization: RST Engineering Lines: 27 Message-ID: <405euj$mas@hg.oro.net> References: <4059su$mtf@morrow.stanford.edu> NNTP-Posting-Host: @rst-engr.oro.net X-Newsreader: Forte Free Agent v0.55 Stephen.Parry@forsythe.stanford.edu (Stephen Parry) wrote: >Does anyone know a source for stainless steel, or even better >titanium, uninsulated wire in small quantities? I'm looking for >something around 20 AWG. >Stephen Yes, go to any aviation repair shop or supply store (your local small puddlejumper airport mechanic can help you find one, or there are a hundred of them listed in a magazine called "Trade-A-Plane). We use stainless steel wire in many gauges for tying bolts and nuts down; it is called "safety wire". You can probably talk the mech into giving you a few feet; a full roll is only a few bucks or so. Titanium, on the other hand... Jim Weir Airframe & Powerplant Mechanic Jim Weir VP Engineering | "I turned to my wife, as startled as the RST Engineering | pilot by what I'd seen. Dirt-streaked, Grass Valley CA 95945 | glorious, she smiled at me, tear-bright voice/fax 916/272-1432 | radiance. 'Richie, they're going to try rst-engr@oro.net | for it!' she said, "Wish them love!'" (Bach) From amsoft@epix.net Mon Aug 07 17:16:19 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!tank.news.pipex.net!pipex!soap.news.pipex.net!pipex!dish.news.pipex.net!pipex!news.pavilion.co.uk!usenet From: mit@pavilion.co.uk (mit) Newsgroups: rec.radio.amateur.homebrew Subject: TMS 3802 IC Info Date: Sat, 05 Aug 1995 23:08:41 +0100 Organization: Pavilion Internet plc, Brighton, England Lines: 10 Message-ID: <400qtb$5j9@fitzherbert.pavilion.co.uk> NNTP-Posting-Host: line0f.kemp-du.pavilion.co.uk X-Newsreader: Forte Free Agent v0.38 Has anyone any information on this IC TMS3802A or another TMS3812NC. They are used as dividers in an organ note generator circuit, late 70/80's. Please reply by EMAIL if you can Thanks a lot. Lawrence From amsoft@epix.net Mon Aug 07 17:16:20 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!tank.news.pipex.net!pipex!lade.news.pipex.net!pipex!dish.news.pipex.net!pipex!news.pavilion.co.uk!usenet From: mit@pavilion.co.uk (mit) Newsgroups: rec.radio.amateur.homebrew Subject: TMS3802 Divider IC Info Date: Sat, 05 Aug 1995 23:08:44 +0100 Organization: Pavilion Internet plc, Brighton, England Lines: 10 Message-ID: <400qte$5j9@fitzherbert.pavilion.co.uk> NNTP-Posting-Host: line0f.kemp-du.pavilion.co.uk X-Newsreader: Forte Free Agent v0.38 Does anyone have any info or equivalenrt for TMS3802A (TO5 pack) or TMS3812NC (DIP), in organ note generator possible late 70's or ealy '80s vintage Please reply by E-MAIL if you can Thanks Lawrence From amsoft@epix.net Mon Aug 07 17:16:20 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!news.pavilion.co.uk!usenet From: mit@pavilion.co.uk (mit) Newsgroups: rec.radio.amateur.homebrew Subject: TMS3802 Divider Info Date: Sat, 05 Aug 1995 23:08:46 +0100 Organization: Pavilion Internet plc, Brighton, England Lines: 9 Message-ID: <400qtf$5j9@fitzherbert.pavilion.co.uk> NNTP-Posting-Host: line0f.kemp-du.pavilion.co.uk X-Newsreader: Forte Free Agent v0.38 Does anyone have info on TMS3802 (TO-5) or TMS3812 (DIP) divider circuits used in old style electronic organ note generators Please reply via EMAIL if you can Thanks Lawrence From amsoft@epix.net Mon Aug 07 17:16:21 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: CITGATE@ccn.ge.COM (CITGATE) Newsgroups: rec.radio.amateur.homebrew Subject: Undeliverable Mail Date: 6 Aug 95 19:03:18 GMT Organization: ucsd usenet gateway Lines: 9 Message-ID: NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Unknown Microsoft mail form. Approximate representation follows. Message: Ham-Homebrew Digest V95 #237 Sent: Sat, Aug 5, 1995 8:55 AM To: CheesmanDave On Server: Mail 12 Corp. Woods Date: Sun, Aug 6, 1995 3:03 PM Reason: Could not be delivered because the destination Microsoft Mail server could not be found. From amsoft@epix.net Mon Aug 07 17:16:22 1995 Path: grape.epix.net!news.sprintlink.net!simtel!harbinger.cc.monash.edu.au!yarrina.connect.com.au!labtam!news.mel.aone.net.au!OzEmail!usenet From: flakey@ozemail.com.au (Flakey) Newsgroups: rec.radio.amateur.homebrew Subject: Uniden Plans wanted :) .. Date: 6 Aug 1995 04:48:57 GMT Organization: ACME Lines: 10 Message-ID: <401hjp$kbb@oznet03.ozemail.com.au> NNTP-Posting-Host: slsyd3p24.ozemail.com.au X-Newsreader: WinVN 0.99.4 lo' can anyone tell me if you can get the schematic diagrams for the Uniden Sundowner UHF CB from Uniden direct - or would anyone have the schematics for the attachment mic&speaker ports ? reply via email please :) .. flakey@ozemail.com.au //flakey From amsoft@epix.net Mon Aug 07 17:16:24 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!howland.reston.ans.net!agate!library.ucla.edu!info.ucla.edu!news.ucdavis.edu!csus.edu!netcom.com!rohrwerk From: rohrwerk@netcom.com (John Seboldt) Subject: VFO Stability Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) Date: Sun, 6 Aug 1995 22:42:20 GMT Lines: 62 Sender: rohrwerk@netcom3.netcom.com I'm pretty finicky about VFO drift, being a musician with acute sensitivity to pitch. So I thought I'd share a few experiences in homebrewing 7 MHz VFO's and ask some other comments/advice. The simple Hartley circuit (such as W7EL's Optimized QRP Xcvr) never satisfied me -- it never seemed to settle down, with a slow drift downward that never stopped. This is after boiling the toroid (which helped), and using NP0 caps. It went down about 200 Hz in an hour (cold start), thereafter about 80 Hz per hour -- enough to notice during a QSO, because at 750 Hz a change in pitch by a half-step (musically speaking) is about 40 Hz -- noticeable to me! This is after boxing it up carefully, letting it cool a long time, etc. Incidentally, it's interesting to listen for drift when heating the leads of individual components. A quick probe with the iron, and withdrawing a safe distance, showed that capacitors marked NP0 do indeed have *some* drift in an imperfect world, but most of them moved very little (and in either direction!) Heating the transistor, and even the RIT tuning diode, had less effect than I thought. BUt, of course, the TOROID was the biggest culprit, providing a siginificant downward drift of 1 or 2 kHz (i.e., more inductance) when the iron was stuck in the hole for about 2 seconds. (This is a T-44-6 coil). Substituting air wound Miniductor stock helped, but again that steady drift down. Then I built up the series-tuned Colpitts used by W1FB, a breadboard version without a box. At 7 MHz, a toroid inductor (about 6 uH) again proved unsatisfactory, the drift being about the same. Using a piece of close spaced airwound coil stock, stability improved a lot, with many 1 hour periods where I could leave the room and return, and the pitch remained steady to my ear. (this means less than 40 Hz). Better yet, a close-wound wire coil on a 1/2 inch ceramic form (no slug) did even better in the above circuit. One run I left it sitting all night, and it stayed with a half-step at about 200 Hz audible pitch -- a drift of about 10 Hz! Spot checks during the day showÙd it staying within about this range. Other runs varied, but were significantly better than other configurations. And all this without a box, though in a room without windows with fairly steady temperature (when the central air isn't on). Both of the air-wound coils were far more immune to drift from blowing on them at a distance (warm air from your breath). My drift was measu¹ed by ear on a RS DX440 receiver, with BFO continually recalibrated to zero beat on 10 MHz WWV. (Yes, you CAN hear zero beat if you listen for variations in background noise, and especially when it's modulated with a continuous tone). So, it seems that the old Miniductor stock, with its plastic ribs, is pretty good, but prone to some drift from heating. I wonder how good a piece of small PVC pipe would work -- because my ceramic forms are a bit large and I don't know how to cut them cleanly! : John Seboldt rohrwerk@netcom.com / CW: It don't mean a thing : Amateur radio K0JD... / if it ain't got that swing! : Church of the Annunciation, / Di dah, di dah, di dah, di dah... : Minneapolis / (sorry, Duke!) From amsoft@epix.net Mon Aug 07 17:16:26 1995 Path: grape.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VFO Stability Date: Sun, 06 Aug 95 23:30:47 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 41 Distribution: world Message-ID: <403k0p$ab@nuclear.microserve.net> References: NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 rohrwerk@netcom.com (John Seboldt) wrote: > >Better yet, a close-wound wire coil on a 1/2 inch ceramic form (no slug) >did even better in the above circuit. One run I left it sitting all >night, and it stayed with a half-step at about 200 Hz audible pitch -- a >drift of about 10 Hz! Spot checks during the day showÙd it staying >within about this range. Other runs varied, but were significantly better >than other configurations. And all this without a box, though in a room >without windows with fairly steady temperature (when the central air isn't >on). This agrees closely with my own experiences building VFOs. One of the most stable I ever produced was built around the older W7ZOI high-stability (JFET) Hartley circuit. I used an ARC-5 transmitter covering the 80M band as a test bed and simply wired the FET, diode and one or two small fixed ceramic caps onto the tube pins of the original oscillator. The caps I added were *not* NPO. For anyone not familiar with these transmitters, their VFOs used a very large ball-bearing tuning cap, an air trimmer, and a large ceramic coil form (about 1-1/2") with heavy gauge wire and a tunable iron slug. All of the tuned components were enclosed in a formed aluminum shield on the top side of the chassis. Anyway, after installing the circuit in the original chassis, I found that the original dial markings were almost exactly correct, and that only a slight adjustment of the trimmer and slug were required for perfect alignment. Most of the cold start drift occurred in the first 15 minutes and was measured at better than 100 Hz over the first hour, improving to better than 10 Hz per hour thereafter. After confirming this with cold starts on several consecutive days, I let the oscillator run overnight. The <= 10 Hz wanderings recorded during previous runs were both positive and negative, and the final measurement after more than 24 hours was still within 10 Hz of the frequency achieved after one hour of warmup. FWIW, the counter used for these tests had a 10 MHz ovenized oscillator and was adjusted to WWV (as necessary) before each measurement. There is no question in my mind that ceramic forms and large gauge wire are a significant aid to good VFO design. At the very least, starting with these components can save many hours of cut and try in attempting to build stable VFOs. 73, Jack WB3U From amsoft@epix.net Mon Aug 07 17:16:27 1995 Path: grape.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!news.erinet.com!uunet!in2.uu.net!pipeline!not-for-mail From: acatalan@nyc.pipeline.com (Anthony G. Catalano) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Want to build a power supply Date: 6 Aug 1995 06:11:31 -0400 Organization: The Pipeline Lines: 37 Message-ID: <4024gj$i21@pipe2.nyc.pipeline.com> References: NNTP-Posting-Host: pipe2.nyc.pipeline.com X-Newsreader: The Pipeline v3.1.1 If you can, use power PNP transistors as the pass devices because using NPNs as pass transistor place the load between from the emitter and ground. (affecting regulation) The PNP configuration puts the load between the positive supply and the collector. The collector, unlike the base and the emitter is the only non-controlling electrode on a 3 leg xsistor. (actually the same can be done with an NPN by reversing a few things and using an positive groung isolated from the cabinet but its too confusing a project for a beginner) Look for a schematic that uses a good reference source, not just a zener diode. Reference groung at ONE common point: loops or ground voltage differences can become significant in high-current power supplies. At 20 amps use 4 pass transistors as a minimum to run cool and also use equalizing resistors (.05 to .15ohms ??) at the output leg of each one in order to avoid just one from "hogging" all the current, creating a hot-spot within that transistor. Any regulated power supply for RF should us a METAL cabinet and the leads should be RF-shorted to ground using a few capacitors (.01 .47 and a 1uf from positive to the metal cabinet just befor exiting. The negative line may allready be directyl connected to ground in most cases so bypassing won't be needed. Fuse the 110 in and the 12v out!!! If possible include an overvoltage circuit to protect your fed equipment from cooking. (a simple "crowbar" circuit.) Meter, meter... use a meter. Have fun & stay away from 3,000 volt B+ supply projects for now. Anthony Catalano WW2W From amsoft@epix.net Mon Aug 07 17:16:30 1995 Path: grape.epix.net!news.sprintlink.net!simtel!zombie.ncsc.mil!news.duke.edu!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Want to build a power supply Date: Sun, 06 Aug 95 15:20:02 GMT Organization: TSE Systems Lines: 132 Message-ID: <402mj4$50q@solaris.cc.vt.edu> References: <4024gj$i21@pipe2.nyc.pipeline.com> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 In article <4024gj$i21@pipe2.nyc.pipeline.com>, acatalan@nyc.pipeline.com (Anthony G. Catalano) wrote: >If you can, use power PNP transistors as the pass devices because using >NPNs as pass >transistor place the load between from the emitter and ground. (affecting >regulation) >The PNP configuration puts the load between the positive supply and the >collector. >The collector, unlike the base and the emitter is the only non-controlling >electrode >on a 3 leg xsistor. >(actually the same can be done with an NPN by reversing a few things and >using an >positive groung isolated from the cabinet but its too confusing a project >for a beginner) Although using a common-emitter configuration for the pass transistor has some advantages, the main disadvantage is lower stability. The common-collector configuration (load connected to emitter) has inherent negative feedback which prevents the emitter voltage from varying widely while the base voltage is held constant. (The fact that the emittter is a "controlling leg" is an advantage since it controls in a manner that will stabilize the output voltage). Common-emitter circuits act more like current sources, which makes it more difficult to stabilize the output voltage. Additionally the often low ft of power PNP transistors can complicate the stability problem. Another advantage of the common-collector is that the drive current also flows into the load, rather than needing to be dissipated in the driver. >Look for a schematic that uses a good reference source, not just a zener >diode. Absolute laboratory precision of the output voltage is not required for battery replacement type applications, since the equipment being powered is built to handle varying battery voltages. What is important is low ripple from the reference source, since this ripple will appear at the output as well. A Zener diode with two capacitors in parallel with it (one small, to catch RF, and one large, to stop 60 Hz) will do this job nicely. Most commercial supplies are built around the 723 type IC, which includes the reference voltage generator for you. >Reference groung at ONE common point: loops or ground voltage differences >can >become significant in high-current power supplies. Absolutely. >At 20 amps use 4 pass transistors as a minimum to run cool and also use >equalizing >resistors (.05 to .15ohms ??) at the output leg of each one in order to ^^^^^^^^^^ Should say "emitter" here, regardless of which lead is the output of the amplifier. >avoid just >one from "hogging" all the current, creating a hot-spot within that >transistor. The equalizing resistors need to be in the emitter and/or base leads in any case to absorb differences in the Vbe of the transistors. The collector, being a current source, will not be affected by a small resistor in series. If power MOSFETS are used instead (generally more expensive), then no resistors will be required, they are voltage-driven and can simply be connected in parallel. >Any regulated power supply for RF should us a METAL cabinet and the leads >should be >RF-shorted to ground using a few capacitors (.01 .47 and a 1uf from >positive to the >metal cabinet just befor exiting. The negative line may allready be >directyl connected >to ground in most cases so bypassing won't be needed. Another important point. Using the point where the negative lead leaves the cabinet as the single point ground would make sense too. Using a capacitor of several hundred uF on the output will also make the regulator's job easier in regard to transients, and may even be required to keep the regulator stable into all loads. >Fuse the 110 in and the 12v out!!! Definitely need a fuse on the 120V in. This is the only place that really needs a fuse since the power supply doesn't generate power, it just transforms it. The 12V out will have a current limiter of some sort, and if that fails, the input fuse will blow if it is sized properly. >If possible include an overvoltage circuit to protect your fed equipment >from cooking. (a simple "crowbar" circuit.) Remember to RF-bypass the triger circuit for the crowbar to prevent it from acting unnecessarily when there is RF around. And never connect a supply equipped with a crowbar directly to a lead-acid battery without a fuse (a blocking diode will keep the fuse from blowing, but isn't essential for safety). Come to think of it, of course never connect ANYTHING to a lead-acid battery without a fuse right at the battery. >Meter, meter... use a meter. >Have fun & stay away from 3,000 volt B+ supply projects for now. In general, commercially-built linear power supplies (in the 5 Amp and up class) use NPN transistors as the pass element, controlled by a 723 and driven by a smaller NPN transistor. The driver circuit is powered by higher voltage from another winding on the transformer or (in smaller supplies) a center-tapped rectifier arrangement. With boosted drive voltage readily available, the main advantage of the common-emitter pass circuit, low dropout voltage, is not a factor, since the common-collector stage can be driven to saturation. Another trick, rather than dropping 0.7V at the full output current to sense for overcurrent, is to monitor the base drive current instead, since the gain of the output transistors is roughly known, a current limiter adequate for protective purposes anyway can be realized without needing a 50W low-ohm resistor. For low-current power supplies (1-5 A, for less than 1A just use a 3-terminal regulator), discrete transistor regulators are practical. Usually the error amplifier is implemented with a NPN transistor with the emitter connected to the reference and the base connected to a voltage divider. The reference is a Zener diode, or one really popular design used the front-panel pilot light LED as the reference! Not recommended unless cost is a real concern. The collector of the error amplifier transistor drives a driver transistor, then the output transistor. Both of these are common-collector. It is also quite feasible to use a 3-terminal regulator to drive a current booster transistor for the 1-5A class, but the current limiter for this design requires another medium-power transistor, and the dropout voltage can be quite high as well. The Radio Shack 2A supply (copying not recommended), actually uses a 15V Zener driving two common-collector stages with no feedback other than that inherent in the voltage followers. It doesn't work very well, but shows what can be gotten away with. -Mike KD4QDM From amsoft@epix.net Mon Aug 07 17:16:31 1995 Path: grape.epix.net!news.sprintlink.net!uunet!in2.uu.net!news.iii.net!iii2.iii.net!not-for-mail From: sefranek@iii2.iii.net (Thomas C Sefranek) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Want to build a power supply Date: 6 Aug 1995 11:31:30 -0400 Organization: iii.net Lines: 21 Message-ID: <402n8i$2v4@iii2.iii.net> References: NNTP-Posting-Host: iii2.iii.net Well, What step-down transformer do you have? (Voltage and current) That the FIRST place to start. If you don't have a transformer, or want to size it before building/buying, Assume you mean 13.6 Volts out, Plus 3 volt loss in regulator burden, Plus 1.5 volts rectifier burden, You need a transformer with about 18 VRMS at the current you desire, or more. Quick rule of thumb, for the capacitor is 1,000 mfd for every amp. so about 20,000 mfd at 25 VDC minimum. There are so many good choices for linear regulators and pass transistors, DON'T use the tired multiple 2N3055 design unless it's the only transistors you can get. Power FET's rule! Feel free to E-Mail me for further advice. Tom -- Thomas C. J. Sefranek WA1RHP Work: 508-425-2200 Home: 508-425-6672 From amsoft@epix.net Mon Aug 07 17:16:32 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in1.uu.net!pipeline!not-for-mail From: acatalan@nyc.pipeline.com (Anthony G. Catalano) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Why variable BFO? Date: 6 Aug 1995 05:21:09 -0400 Organization: The Pipeline Lines: 29 Message-ID: <4021i5$h9f@pipe2.nyc.pipeline.com> References: <3vp2b8$qpr@franklin.cc.utas.edu.au> NNTP-Posting-Host: pipe2.nyc.pipeline.com X-Newsreader: The Pipeline v3.1.1 On 2 Aug 1995 in article , 'ian.mitchell@research.utas.edu.au (Ian Mitchell)' wrote: >Ok, does that mean in a low cost receiver with a not so narrow IF filter, >a fixed frequency BFO (frequency set to middle of IF) could be used to >resolve an SSB signal, regardless of which side band the signal is on, >as long as there are no other nearby signals? > >And presumably small tuning steps would be a necessity. First, yes but it would only be "clarified" if the original suppresed carrier frequency (converted) were to be adjusted to fall in the middle of the IF to match the fixed BFO frequency as your example gives. By "as long as there are no othere signals" I mean it would still work, but a signal on "the other side" would not be selectively attenuated against the desired signal in any way unless the shaping of such an IF filter were offset to favor one of the sidebands. A direct-conversion receiver works EXACTLY as YOU have described above except that there is no frequency conversion performed, although technically speaking the first "IF" is the AUDIO produced! ( as you can imagine a fixed bfo in a direct conversion receiver can become very boring feature- Ok for WWV rec'pt.) Anthony Catalano WW2W From amsoft@epix.net Mon Aug 07 17:16:33 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!emory!sol.ctr.columbia.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!uunet!in2.uu.net!pipeline!not-for-mail From: acatalan@nyc.pipeline.com (Anthony G. Catalano) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Why variable BFO? Date: 6 Aug 1995 05:38:23 -0400 Organization: The Pipeline Lines: 20 Message-ID: <4022if$hi7@pipe2.nyc.pipeline.com> References: <3vp2b8$qpr@franklin.cc.utas.edu.au> NNTP-Posting-Host: pipe2.nyc.pipeline.com X-Newsreader: The Pipeline v3.1.1 On 2 Aug 1995 in article , 'ian.mitchell@research.utas.edu.au (Ian Mitchell)' wrote: >And presumably small tuning steps would be a necessity. oops forgot to answer that one... Sure, small tuning steps would be peachy-keen to have. however it has nothing to do mathematically/electronically with the radio being able to detect signals or not. (to receive them well/correctly, yes-- I am nit-picking to make a point only)) If a commercial SSB or AM station is X-mitting exactly on 11005khz and you can tune in 1khz increments (on SSB mode) and your in luck. If a ham is on 7.180.5 the closest you can get to his/her frequency would be 500hz. In THAT case 100hz tuning resolution WOULD be a very desirable feature in order to zero-beat that signal and recover it's original intelligence. In my opinion 100hz resolution for a digital receiver in ssb mode should be the highest minimum resolution acceptable. Anthony Catalano WW2W From amsoft@epix.net Mon Aug 07 17:16:34 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!agate!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!nash.pubnix.net!mba!juxta!michael.black From: Michael.Black@juxta.mba.org (Michael Black) Date: 31 Jul 95 21:06:48 Newsgroups: rec.radio.amateur.homebrew Subject: re: Why variable BFO? Message-ID: <1a6_9508061528@mba.mba.org> Organization: MtlNet (MBA.org) Juxtaposition BBS Lines: 69 ian.mitchell@research.utas.edu.au (Ian Mitchell) is wondering why the low cost shortwave receivers have tuneable BFO's while the more expensive ones have a LSB/USB switch. I would think cost has a lot to do with it. If you assume that the switch selected BFO's are crystal controlled, then the cost of the crystals is not warranted for inexpensive sets. IN the early days, I'm sure all BFO's were tuneable, and then only later did crystal control arrive. Thinking about it now, crystal controlled BFO's probably didn't show up in amateur receivers till receivers intended for SSB hit the market, and they were of course the expensive receivers. The low end receivers have basically stayed the same. One reason for going to crystal control of a BFO was the ease of switching between the two sidebands. When the receivers started getting sharp filters intended for SSB, you wanted the BFO right on the slope to take advantage of the sharpness of the filter. If the BFO's had stayed tuneable, you'd always have to keep fiddling a bit each time you changed sidebands, to get that exact spot. And yes, your thought about the selectivity of the receiver probably does play a part. The cheaper receivers would tend to have filters with not so sharp curves, and there is not the need to get the BFO right at a certain point. When you start using a receiver with the relatively wide bandwidth intended for AM broadcast, you you could put the BFO right in the middle of the passband and you wouldn't even have single signal selectivity. It would be like a direct conversion receiver in that you'd get the audio image, but with better dynamic range due to there being selectivity, albeit wide, between the antenna and the product detector. A tuneable BFO in this case would have the effect of a fine tuning control, just as tuning the "BFO" in a direct conversion receiver tunes it across the band. I have thought of the possibility of building a "hybrid" receiver, where the first mixer would be fed with a synthesizer with something like 5KHz steps (it's easier to build a quiet synthesizer as the tuning steps get bigger), then put it through an FM-type crystal filter at 10.7MHz, and either put a direct conversion receiver after that or a second mixer with a 5KHz tuning range to take it down to lower frequency final IF where there is a narrow filter and product detector. It would be a way of getting a relatively simple general coverage receiver, but with the advantages of synthesizer tuning. I remember seeing one receiver in QST from about 1958 or so (the year before I was born, so I read it a number of years later) which was a single conversion six meter receiver. It used in the IF a then relatively new item, a manufactured crystal filter in the HF range, and having something like a 4KHz bandwidth. It used a crystal controlled BFO, which makes sense since it's easier keeping a crystal on frequency than an LC-tuned oscillator. But the BFO was right in the middle of the IF. The idea being that the filter was wide enough for things like CW and even SSB that you could tune the receiver until you got the right beat note and everything would be fine. I hope that helps, and I'm glad you found the 10.245MHz crystals. I'm not sure how the Australian dollar converts to Canadian these days, but the price you mention sounds not too expensive, which is the right price. Michael VE2BVW -- | InterNet: Michael.Black@juxta.mba.org | Standard disclaimer: The views of this user are strictly their own. From amsoft@epix.net Mon Aug 07 17:16:35 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!agate!howland.reston.ans.net!news.sprintlink.net!news.continuum.net!usenet From: jrovero@q.continuum.net Newsgroups: rec.radio.amateur.homebrew Subject: Re: Why variable BFO? Date: 7 Aug 1995 01:47:55 GMT Organization: Ocean Surveys, Inc. Lines: 16 Message-ID: <403rcb$n9h@news.continuum.net> References: <1a6_9508061528@mba.mba.org> Reply-To: jrovero@q.continuum.net NNTP-Posting-Host: cd-4.continuum.net X-Newsreader: IBM NewsReader/2 v1.09 In <1a6_9508061528@mba.mba.org>, Michael.Black@juxta.mba.org (Michael Black) writes: >ian.mitchell@research.utas.edu.au (Ian Mitchell) is wondering >why the low cost shortwave receivers have tuneable BFO's while >the more expensive ones have a LSB/USB switch. > There are some very pricey professional HF receivers by Watkins-Johnson, Racal, etc that STILL have variable BFO in the CW mode. Very pricey receivers....... P.J. "Josh" Rovero work: provero@connix.com Ocean Surveys, Inc. play: jrovero@q.continuum.com Old Saybrook, CT 06475 USA Amateur Radio: KK1D From amsoft@epix.net Mon Aug 07 17:16:38 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!usenet.ins.cwru.edu!agate!spool.mu.edu!bloom-beacon.mit.edu!news.kei.com!simtel!harbinger.cc.monash.edu.au!newsroom.utas.edu.au!news From: ian.mitchell@research.utas.edu.au (Ian Mitchell) Newsgroups: rec.radio.amateur.homebrew Subject: re: Why variable BFO? Date: 7 Aug 1995 02:36:23 GMT Organization: University of Tasmania Lines: 113 Message-ID: <403u77$i4j@franklin.cc.utas.edu.au> References: <1a6_9508061528@mba.mba.org> NNTP-Posting-Host: pc122.research.utas.edu.au Mime-Version: 1.0 X-Newsreader: WinVN 0.99.2 In article <1a6_9508061528@mba.mba.org>, Michael.Black@juxta.mba.org says... -> ->ian.mitchell@research.utas.edu.au (Ian Mitchell) is wondering ->why the low cost shortwave receivers have tuneable BFO's while ->the more expensive ones have a LSB/USB switch. -> ->I would think cost has a lot to do with it. If you assume that ->the switch selected BFO's are crystal controlled, then the cost ->of the crystals is not warranted for inexpensive sets. IN the ->early days, I'm sure all BFO's were tuneable, and then only later ->did crystal control arrive. Thinking about it now, crystal controlled ->BFO's probably didn't show up in amateur receivers till receivers ->intended for SSB hit the market, and they were of course the ->expensive receivers. The low end receivers have basically stayed ->the same. -> ->One reason for going to crystal control of a BFO was the ease of ->switching between the two sidebands. When the receivers started ->getting sharp filters intended for SSB, you wanted the BFO right on ->the slope to take advantage of the sharpness of the filter. If ->the BFO's had stayed tuneable, you'd always have to keep fiddling ->a bit each time you changed sidebands, to get that exact spot. -> ->And yes, your thought about the selectivity of the receiver probably ->does play a part. The cheaper receivers would tend to have filters ->with not so sharp curves, and there is not the need to get the BFO ->right at a certain point. -> ->When you start using a receiver with the relatively wide bandwidth ->intended for AM broadcast, you you could put the BFO right in the ->middle of the passband and you wouldn't even have single signal ->selectivity. It would be like a direct conversion receiver in that ->you'd get the audio image, but with better dynamic range due to ->there being selectivity, albeit wide, between the antenna and the ->product detector. A tuneable BFO in this case would have the effect ->of a fine tuning control, just as tuning the "BFO" in a direct ->conversion receiver tunes it across the band. -> ->I have thought of the possibility of building a "hybrid" receiver, ->where the first mixer would be fed with a synthesizer with something ->like 5KHz steps (it's easier to build a quiet synthesizer as the >-tuning steps get bigger), then put it through an FM-type crystal ->filter at 10.7MHz, and either put a direct conversion receiver ->after that or a second mixer with a 5KHz tuning range to take it ->down to lower frequency final IF where there is a narrow filter ->and product detector. It would be a way of getting a relatively ->simple general coverage receiver, but with the advantages of ->synthesizer tuning. -> ->I remember seeing one receiver in QST from about 1958 or so (the ->year before I was born, so I read it a number of years later) which ->was a single conversion six meter receiver. It used in the IF a ->then relatively new item, a manufactured crystal filter in the HF ->range, and having something like a 4KHz bandwidth. It used a ->crystal controlled BFO, which makes sense since it's easier ->keeping a crystal on frequency than an LC-tuned oscillator. But ->the BFO was right in the middle of the IF. The idea being that ->the filter was wide enough for things like CW and even SSB that ->you could tune the receiver until you got the right beat note ->and everything would be fine. -> ->I hope that helps, and I'm glad you found the 10.245MHz crystals. ->I'm not sure how the Australian dollar converts to Canadian these ->days, but the price you mention sounds not too expensive, which is ->the right price. -> -> Michael VE2BVW Thanks for that Michael, much appreciated. As you've problably guessed I'm trying to design a general coverage receiver using the MC3362 FM receiver chip. This device has two mixers and osc's with IF's at 10.7MHz and 455KHz. The first LO is variable while the second is fixed at 10.245MHz - hence my enquiry on the crystals. I've tracked down the filters (ceramic) which are quite low cost, luckily. For resolving AM, I'd like to use the ZN414 (MK414), because it has good gain, built in AM detector and AGC. The signal for it being taken from the output of the 455KHz filter via a switchable SSB section - explained below. Instead of using the built-in VFO, I've designed a simple DDS, controlled by an MC68HC705K1 low cost microcontroller from Motorola. The DDS is implemented using an EPM7096 PLD from Altera. I'm hoping to avoid having to use an AD converter by connecting the high order bit of the accumulator directly to the 3362. The mixers in the 3362 look a lot like the Gilbert type, so I'm hoping this idea works! I've calculated the fourier spectrum using a spreadsheet, and it doesn't look any worse that a square wave! Anyway, the other function of the PLD is to generate a 455KHz BFO signal, under the control of the microcontroller. The BFO signal is also a TTL square wave. So, the problem is to mix the BFO signal with the 455KHz IF so that the ZN414 can detect it for SSB. My idea so far is as follows: Since the 3362 provides the correct loading for the 455KHz, a JFET, with its high input impedence could be used to tap off the signal from the output of the IF. Following this a common emitter amp with its emitter resister connected to the BFO output instead of GND, and the output feeding the input of another 455KHz ceramic filter, followed by the ZN414. For AM the output of the BFO should be held low. For SSB this arrangement would thus cause the signal to switch on and off at 455KHz, but the 455KHz filter would reduce the harmonic content leaving a signal for the detector. So, I am wondering if this method will work ok, or is there a simpler way? I am open to, and appreciate any comments. Cheers and thanks, Ian From amsoft@epix.net Thu Aug 10 15:32:58 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!EU.net!uunet!in1.uu.net!news-1a.csn.net!usenet From: Jonathan Erdman Newsgroups: rec.radio.amateur.homebrew Subject: 1995 Crested Butte CO Beer Festival Date: 10 Aug 1995 06:12:16 GMT Organization: CBI Lines: 6 Message-ID: <40c800$oi8@news-2.csn.net> NNTP-Posting-Host: 199.117.108.4 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-URL: news:rec.radio.amateur.homebrew Come drink some special beers in the sunny Rocky Mountains. Better yet, bring some of your own brew for others to try. Lodging and meals provided for brewers. For detailed information go to http://www.cbinteractive.com/cbws/beer.html From amsoft@epix.net Thu Aug 10 15:32:59 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!news-1a.csn.net!usenet From: Jonathan Erdman Newsgroups: rec.radio.amateur.homebrew Subject: 1995 Crested Butte CO Beer Festival Date: 10 Aug 1995 06:19:29 GMT Organization: CBI Lines: 6 Message-ID: <40c8dh$oi8@news-2.csn.net> NNTP-Posting-Host: 199.117.108.4 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-URL: news:rec.radio.amateur.homebrew Come drink some special beers in the sunny Rocky Mountains. Better yet, bring some of your own brew for others to try. Lodging and meals provided for brewers. For detailed information go to http://www.cbinteractive.com/cbws/beer.html From amsoft@epix.net Thu Aug 10 15:32:59 1995 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.space Path: grape.epix.net!news.sprintlink.net!crash!hns_west!bdonaldson From: BDONALDSON@HNS.COM (Brian Donaldson) Subject: 4 ft Aluminum Snow Coasters Sender: news@hns.com (News Administrator) Message-ID: <1995Aug9.175849.402@hns.com> Date: Wed, 9 Aug 1995 17:58:46 GMT Organization: Hughes Network Systems X-Newsreader: News Xpress Version 1.0 Beta #3 Lines: 15 Xref: grape.epix.net rec.radio.amateur.homebrew:8841 rec.radio.amateur.space:4548 Anyone out there is Net-land know where someone from SoCal can find a NEW 4 ft (or so) Alunimum Snow Coaster? (it's for playing around with KU band) Brian, KF6BL ,,, Waddayamean, it's NOT workin'?! (o o) =================oOO==(_)==OOo===================================== Brian Donaldson Project Engineer, Customer Svc Hughes Network Systems, Inc. TES, Terrestrial, et al... 10450 Pacific Center Ct. Email: bdonaldson@hns.com San Diego, CA 92121 Phone: (619) 452-5175 Room 2077 Fax: (619) 452-4886 =================================================================== From amsoft@epix.net Thu Aug 10 15:33:00 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!miwok!infoway!don.phelps From: don.phelps@infoway.com (Don Phelps) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 4-1000 Date: Wed, 9 Aug 1995 07:54:00 GMT Message-ID: <9508090754186334@infoway.com> Organization: The Infoway BBS (415)898-8427 14,400 8-N-1 Distribution: world References: <3vuvtb$s7t@nexus.interealm.com> Lines: 24 Wayne, I have a 4-1000 HF amp. Variable roller inductor, vac variable capacitors, for continuous tuning. Very heavy duty power supply with 240V variac for continuous variability. 5' relay rack (w. castors) with lots of meters, and window to watch the 4-1000 etc. This looks like unit built for show in handbook article. I have so many spare 4-1000s, I couldn't resist putting a second one in parrallel, to make input impedance 50 ohms directly. Would you like to buy it, or just trade schematics, experience building these? Too bad I am in California. Don, N6MCE WW> Looking for a Good homebrew HF amp with 4-1000 finale/working. WW> wa2kec WW> wayne@nexus.interealm.com ... Don.Phelps@infoway.com POB9739 SAN RAFAEL CA 94912-9739 ___ Blue Wave/QWK v2.12 From amsoft@epix.net Thu Aug 10 15:33:01 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!cs.utexas.edu!convex!darwin.sura.net!fconvx.ncifcrf.gov!abyss!usenet From: jmz Subject: Amperex tube data X-Nntp-Posting-Host: hawthorn.cis.net Content-Type: text/plain; charset=us-ascii Message-ID: Sender: usenet@cis.net Content-Transfer-Encoding: 7bit Organization: Basic Communications, Limited. Mime-Version: 1.0 Date: Wed, 9 Aug 1995 22:31:12 GMT X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:rec.radio.amateur.homebrew Lines: 6 I am looking for data on the old Amperex twin tetrodes intended for VHF service in the land mobile and avionic industry,circa 1970.I have a copy of an Amperex flier circa 1966 but there were several released after that. From amsoft@epix.net Thu Aug 10 15:33:01 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Eric Hoppe <102475.3010@CompuServe.COM> Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,alt.radio.pirate Subject: An SWR/RF Power Meter Date: 10 Aug 1995 00:53:52 GMT Organization: Progressive Concepts Lines: 8 Message-ID: <40blb0$et2$1@mhadf.production.compuserve.com> Xref: grape.epix.net rec.radio.amateur.antenna:12711 rec.radio.amateur.homebrew:8852 alt.radio.pirate:9558 We have the Diamond Antenna Model SX-200 RF power Meters in stock for only $135 plus $6 shipping. These meters show forward and reflected power and SWR. Switchable full scale readings of 5, 20, and 200 watts. 30 day money back offer, and full one year warranty. Visa and Master Card accepted. Call Today! -- Progressive Concepts (909)626-4969 Fax:(909)626-4329 From amsoft@epix.net Thu Aug 10 15:33:02 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: steve monsey <70307.1052@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: ATV newsgroup Date: 8 Aug 1995 15:57:15 GMT Organization: CompuServe, Inc. (1-800-689-0736) Lines: 10 Message-ID: <4081gr$l8$1@mhafn.production.compuserve.com> References: <3vrlq8$u38@news.ccit.arizona.edu> >Is there a newsgroup where ATV is discussed? Can't seem to find >one. I wish there was a newsqroup. If you find it let me know! My ATV group has just started a WWW page. It just started so there is not much there. But we intened to have lots of cool stuff. The address is http//www.prostar.com/web/ham-tv.html. steve N0FPF -- Seattle From amsoft@epix.net Thu Aug 10 15:33:03 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!ames!niven.ksc.nasa.gov!usenet From: Roger Koss Newsgroups: rec.radio.amateur.homebrew Subject: ATV Tuner from UHF TV Tuner Date: 9 Aug 1995 12:01:56 GMT Organization: NASA, Kennedy Space Center, Payload Operations Lines: 10 Message-ID: <40a83k$mo6@niven.ksc.nasa.gov> NNTP-Posting-Host: 163.205.78.66 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Does anyone have any info on converting an old UHF TV Tuner to receive ATV on the 70cm band ? I believe that UHF Channel 14 is just above the 70 cm band, and I was recently told that there was an article in "Nuts and Volts" magazine which described the mod(s) required. I know that I can use a cable tv tuner on channels 54-57 or so, but unfortunately I haven't been able to lay my hands on a spare cable TV tuner for a reasonable price. I do however have access to a broken TV whose tuner I might be able to salvage. Any info would be appreciated. Please post replies here or E-Mail to kossr@edl1.ksc.nasa.gov. Thanks! From amsoft@epix.net Thu Aug 10 15:33:04 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: steve monsey <70307.1052@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: ATV Tuner from UHF TV Tuner Date: 9 Aug 1995 22:10:28 GMT Organization: CompuServe, Inc. (1-800-689-0736) Lines: 15 Message-ID: <40bbok$glq$2@mhafn.production.compuserve.com> References: <40a83k$mo6@niven.ksc.nasa.gov> You are sorta right! If you use a cable ready tuner such as one in your VCR or cable ready TV you can recieve ATV on 434 on ch 56...( I think..or 59). You have to connect an outside antenna to the cable input of your VCR. The antenna should be a direction type. One problem. The tuner in your VCR is not as sensitive as the downconverters for ATV. The signal in your area should be a strong one such as from a repeater or a close friend. Give it a try anyhow, that is what amature radio is all about! -------------------------000000------------------------------- Steve N0FPF ---Seattle....Hams should be seen as well as heard! Western Washington Amateur Television. From amsoft@epix.net Thu Aug 10 15:33:04 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!uunet!in2.uu.net!tetsuo.communique.net!tony From: tony@gcr1.com (Tony Salvador) Newsgroups: rec.radio.amateur.homebrew Subject: ATV website ?? Where ! Date: Wed, 09 Aug 95 19:47:39 GMT Organization: g. c. r. & associates, inc. Lines: 4 Distribution: world Message-ID: <40b3d6$e9e@tetsuo.communique.net> NNTP-Posting-Host: tony.gcr1.com X-Newsreader: News Xpress Version 1.0 Beta #2.1 Someone listed a WWW homepage or website for ATV operators ...? I'm looking for it ... let me know where it is ... From amsoft@epix.net Thu Aug 10 15:33:05 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!tank.news.pipex.net!pipex!howland.reston.ans.net!ix.netcom.com!netnews From: mjsilva@ix.netcom.com (michael silva) Newsgroups: rec.radio.amateur.homebrew Subject: Boiled Torroid? (was Re: VFO Stability) Date: 8 Aug 1995 01:15:53 GMT Organization: Netcom Lines: 14 Message-ID: <406ds9$mbv@ixnews4.ix.netcom.com> References: NNTP-Posting-Host: ix-val-ca1-02.ix.netcom.com In rohrwerk@netcom.com (John Seboldt) writes: >.... This is after boiling the toroid (which helped).... OK, I'll bite (sorry...), does this really refer to dropping a core in boiling water, or is it shorthand for something entirely different. I *can* imagine that heating up a toroid might do some kind of molecular realignment or something to reduce the temp. drift, but I can also imagine giving a lot of amusement to a lot of people by doing so, so which is it? 73, Mike, KK6GM From amsoft@epix.net Thu Aug 10 15:33:06 1995 Path: grape.epix.net!news.sprintlink.net!news.primenet.com!ip218.phx.primenet.com!markem From: markem@primenet.com (Mark Monninger) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Boiled Torroid? (was Re: VFO Stability) Date: Mon, 7 Aug 1995 20:06:23 MST Organization: Primenet Lines: 18 Message-ID: References: <406ds9$mbv@ixnews4.ix.netcom.com> NNTP-Posting-Host: ip218.phx.primenet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <406ds9$mbv@ixnews4.ix.netcom.com> mjsilva@ix.netcom.com (michael silva) writes:>In rohrwerk@netcom.com (John Seboldt)>writes: >>.... This is after boiling the toroid (which helped).... >OK, I'll bite (sorry...), does this really refer to dropping a core in >boiling water, or is it shorthand for something entirely different. I >*can* imagine that heating up a toroid might do some kind of molecular >realignment or something to reduce the temp. drift, but I can also >imagine giving a lot of amusement to a lot of people by doing so, so >which is it? Actually, I think it anneals the copper wire wound on the toroid and makes the windings less likely to move and change the inductance of the assembly. Doesn't actually affect the toroid, although they can be affected by high temps but I think it takes much higher than 100C. Mark AA7TA From amsoft@epix.net Thu Aug 10 15:33:07 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!howland.reston.ans.net!ix.netcom.com!netcom.com!rohrwerk From: rohrwerk@netcom.com (John Seboldt) Subject: Re: Boiled Torroid? (was Re: VFO Stability) Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: <406ds9$mbv@ixnews4.ix.netcom.com> Date: Tue, 8 Aug 1995 03:26:19 GMT Lines: 26 Sender: rohrwerk@netcom2.netcom.com mjsilva@ix.netcom.com (michael silva) writes: >In rohrwerk@netcom.com (John Seboldt) >writes: >>.... This is after boiling the toroid (which helped).... >OK, I'll bite (sorry...), does this really refer to dropping a core in >boiling water, or is it shorthand for something entirely different. I >73, >Mike, KK6GM Yep, boiling water indeed! Complete with winding. Supposedly this also helps relieve winding stresses by expanding/contracting. It helped some. Thanks for the replies, folks. The consensus very much goes with AIR-CORE COILS for the best VFO stability. Ceramic forms are best, with glass tubing and acrylic rod also possibilities. Toroids are a compromise for compactness at best, which may work OK at lower frequencies, but they don't have the temp. stability of air core coils. : John Seboldt rohrwerk@netcom.com / CW: It don't mean a thing : Amateur radio K0JD... / if it ain't got that swing! : Church of the Annunciation, / Di dah, di dØh, di dah, di dah... : Minneapolis / (sorry, Duke!) From amsoft@epix.net Thu Aug 10 15:33:07 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!news.gmi.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!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.homebrew Subject: Re: Can Schems/Diags be Posted here? *.uue?? Date: 8 Aug 1995 23:33:38 GMT Organization: Los Alamos National Laboratory Lines: 15 Message-ID: <408s8i$mop@newshost.lanl.gov> References: <3vhpu2$ffg@pipe2.nyc.pipeline.com> <3vrrgv$k6@vivanews.vivanet.com> <4056g4$257@newshost.vvm.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 1.1N (Windows; I; 16bit) How can a homebrew "discussion group" be solely limited to discussion only? A shematic or 2 would be much better return on the money cost of "every byte coming thru the modem" than most "discussion" that goes on in most groups. I don't think it would be rude at all, but then, I don't think it's rude or unspeakable to list commercial ads on the Internet either, so don't pay any attention to ME.. -- *********** Jim Devenport WB5AOX ************** * PO Box 445, McIntosh NM 87032 * * http://nis-www.lanl.gov/~jdport/ * *********************************************** From amsoft@epix.net Thu Aug 10 15:33:08 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!hecate.umd.edu!mojo.eng.umd.edu!bloom-beacon.mit.edu!gatech!howland.reston.ans.net!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can Schems/Diags be Posted here? *.uue?? Date: Wed, 09 Aug 95 05:51:08 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 19 Distribution: world Message-ID: <409j4a$bjm@nuclear.microserve.net> References: <3vhpu2$ffg@pipe2.nyc.pipeline.com> <3vrrgv$k6@vivanews.vivanet.com> <4056g4$257@newshost.vvm.com> <408s8i$mop@newshost.lanl.gov> NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 Jim Devenport wrote: >How can a homebrew "discussion group" be solely limited to >discussion only? A shematic or 2 would be much better >return on the money cost of "every byte coming thru the >modem" than most "discussion" that goes on in most groups. >I don't think it would be rude at all, but then, I don't >think it's rude or unspeakable to list commercial ads on >the Internet either, so don't pay any attention to ME.. I agree, and I have occasionally posted a schematic or two here when e-mail indicated that a number of people were interested. Given that it doesn't occur very often, I don't think it's worth worrying about. 73, Jack WB3U From amsoft@epix.net Thu Aug 10 15:33:09 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!not-for-mail From: MUENZLERK@uthscsa.edu (Muenzler, Kevin) Newsgroups: rec.radio.amateur.homebrew Subject: Can Schems/Diags be Posted here? *.uue?? Date: 9 Aug 1995 09:24:18 -0500 Organization: UTexas Mail-to-News Gateway Lines: 32 Sender: nobody@cs.utexas.edu Message-ID: <01HTV4REJL2A001045@uthscsa.edu> NNTP-Posting-Host: news.cs.utexas.edu jackl@pinetree.microserve.com (WB3U) Writes: > > >I agree, and I have occasionally posted a schematic or two here >when e-mail indicated that a number of people were interested. > >Given that it doesn't occur very often, I don't think it's worth >worrying about. > >73, > >Jack WB3U The problem with posting binary/UUEncoded files here is not the fact that occasional posting "isn't worth worrying about." The problem is that this group as well as several others in the rec.radio.amateur.* section of USENET are picked up by a USENET to EMail reflector at the University of California at San Diego. The articles are gathered and placed into digests and sent to thousands of people via EMail. If this was not the case and it simply showed up on a USENET reader as a topic that could be ignored there would not be much of a problem. If someone posts a UUEncoded file here that is 50K and it is duplicated, say 2000 times, that is 100MB of space that is taken up by ONE post. That is why I don't recommend posting UUEncoded files here. If you have one post it to one of the binary newgroups and notify us of its existence by posting an article telling us where it is. Thanks Kevin Muenzler, WB5RUE muenzlerk@uthscsa.edu From amsoft@epix.net Thu Aug 10 15:33:10 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!!tvr From: tvr@les.CNMAT.Berkeley.EDU (Tovar) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can Schems/Diags be Posted here? *.uue?? Date: 09 Aug 1995 18:10:07 GMT Organization: CNMAT Lines: 19 Message-ID: References: <01HTV4REJL2A001045@uthscsa.edu> NNTP-Posting-Host: les.cnmat.berkeley.edu In-reply-to: MUENZLERK@uthscsa.edu's message of 9 Aug 1995 09:24:18 -0500 If someone posts a UUEncoded file here that is 50K and it is duplicated, say 2000 times, that is 100MB of space that is taken up by ONE post. That is why I don't recommend posting UUEncoded files here. If you have one post it to one of the binary newgroups and notify us of its existence by posting an article telling us where it is. Or, you can put on a WWW or FTP server, and include a URL or pathname in your posting. If you ask nicely, there are many folks out here with WWW pages who would be happy to include your schematics and drawings, along with the original text. One of the High Speed Packet pages already has a number of schematics on it, and it is very useful. We could also request that 'alt.binary.radio.amateur' be created, i don't see much trouble getting that through 'alt.config'. Now, of course, not everyone can get 'alt.binary' as much of the material posted there is considered (depending on the site) to either consume very excessive amounts of disk or to be too controversial to be anything more than an "upon request" basis... -- KD6PAG From amsoft@epix.net Thu Aug 10 15:33:11 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can Schems/Diags be Posted here? *.uue?? Date: Wed, 09 Aug 95 22:19:18 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 13 Distribution: world Message-ID: <40bd1d$4d5@nuclear.microserve.net> References: <01HTV4REJL2A001045@uthscsa.edu> NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 tvr@les.CNMAT.Berkeley.EDU (Tovar) wrote: > If someone posts a UUEncoded file here that is 50K and it is > duplicated, say 2000 times, that is 100MB of space that is taken up > by ONE post. That is why I don't recommend posting UUEncoded files > here. I don't understand this. If someone posts a 50K UUE binary to this group, it takes up 50K on the news server I subscribe to. If it also takes up 50K on other servers as well, how does that impact me? Just asking. Jack WB3U From amsoft@epix.net Thu Aug 10 15:33:11 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!tank.news.pipex.net!pipex!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news From: Jim Strohm Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can Schems/Diags be Posted here? *.uue?? Date: 10 Aug 1995 15:24:09 GMT Organization: UniSQL, Inc. Lines: 26 Message-ID: <40d8ap$dpj@unisql.unisql.com> References: 01HTV4REJL2A001045@uthscsa.edu> <40bd1d$4d5@nuclear.microserve.net> NNTP-Posting-Host: blazer.unisql.com X-Newsreader: NCSA Mosaic WB3U writes: > If someone posts a 50K UUE binary to this > group, it takes up 50K on the news server I subscribe to. If it > also takes up 50K on other servers as well, how does that impact me? > Jack, it affects you the same way as if one guy drops a 2KW carrier on 14.313, then 2,000 other hams pile onto 14.313 with 2KW carriers. Even if you're not trying to use 14.313 at the time, it messes up the band for anybody anywhere nearby. The bandwidth -- the capacity for the medium to pass information -- is overtaken by one kind of information that is not useful to all the users, and is not available to other users for any exchange of information. It's called "wasted bandwidth" and it squanders a finite resource. It probably doesn't affect you DIRECTLY -- except that you might QSY to 40, or turn on the TV. But until the noise subsides, or the 2,000 copies of the program get deleted, it takes up more space than it should, space that may be put to a better use. Jim N6OTQ standard disclaimer From amsoft@epix.net Thu Aug 10 15:33:12 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!spool.mu.edu!howland.reston.ans.net!newsjunkie.ans.net!butch!news From: adercole@mezzrtm.lasc.lockheed.com (Anthony D'Ercole) Newsgroups: rec.radio.amateur.homebrew Subject: Re: direct digital synthesis Date: 9 Aug 1995 13:06:24 GMT Organization: Lockheed Aeronautical Systems Company Lines: 11 Message-ID: <40absg$eat@butch.lmsc.lockheed.com> References: <3vm5kk$fdd@jupiter.WichitaKS.HMPD.COM> Reply-To: adercole@mezzrtm.lasc.lockheed.com NNTP-Posting-Host: rtm13.lasc.lockheed.com Summary: TS-440 Rs232 Command Set I would like to interface my TS-440 to my personal Computer. Does anyone out there have the Command/Response set. I have the data to interface electrically but the software interface is a mystery. I can not find it documented anywhere. If you can shed some light either post here or email me directly at: adercole@rtm0.lasc.lockheed.com From amsoft@epix.net Thu Aug 10 15:33:13 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!news.bu.edu!bloom-beacon.mit.edu!news.starnet.net!wupost!news.utdallas.edu!corpgate!bcarh189.bnr.ca!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!bk296 From: bk296@FreeNet.Carleton.CA (Gordon Symonds) Subject: FM Stereo Wireless Microphone Message-ID: Sender: bk296@freenet2.carleton.ca (Gordon Symonds) Reply-To: bk296@FreeNet.Carleton.CA (Gordon Symonds) Organization: The National Capital FreeNet Date: Thu, 10 Aug 1995 11:29:13 GMT Lines: 5 I would like to buy or build an FM stereo wireless mike: L+R audio inputs, a range of about 10' and a power supply of 12 VDC or less. Any leads or assistance appreciated. From amsoft@epix.net Thu Aug 10 15:33:14 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!cs.utexas.edu!news.sprintlink.net!newsfeed.internetmci.com!lamarck.sura.net!news.uky.edu!chuck From: tfugate@uklans.uky.edu (Terry Fugate) Newsgroups: rec.radio.amateur.homebrew Subject: Re: FM Stereo Wireless Microphone Date: 10 Aug 1995 13:02:47 GMT Organization: IT Lines: 16 Message-ID: <40d01n$6bn@service1.uky.edu> References: NNTP-Posting-Host: 128.163.13.56 X-Newsreader: WinVN 0.92.6 In article , bk296@FreeNet.Carleton.CA (Gordon Symonds) says: > > >I would like to buy or build an FM stereo wireless mike: L+R audio inputs, >a range of about 10' and a power supply of 12 VDC or less. Any leads >or assistance appreciated. > You might try your local Kmart or Walmart. I have seen a small FM stereo tx that they sell. It is desinged to take your portable CD player and "bradcast" it into you car stereo. I suspect that you could go inside it and add a preamp to boast a microphone level to a line level. There might be a "pad" to reduce the level from line/earphone to approaching microphone level. The mini tx's were pretty cheap.. like maybe $20.00 Good luck and let us know how it works Terry Fugate From amsoft@epix.net Thu Aug 10 15:33:14 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!uunet!in1.uu.net!fonorola!news.compulink.com!abyss!lethe!gts!westonia!ppp-1 From: joe@westonia.com (Joseph Cooper) Subject: Gyrator Curcuit design Message-ID: Sender: news@westonia.com Nntp-Posting-Host: ppp-1.ppp.westonia.com Organization: Westonia X-Newsreader: News Xpress Version 1.0 Beta #3 Date: Sun, 6 Aug 1995 22:45:33 GMT Lines: 25 I am looking for information on a method of curcuit design call the 'Gyrator'. What is of interest is that the design uses resistance, rather than inductance, to create impedance. What the basic cuircuit looks like is a group of resistors in series of the same value with one capacitor in that series line. For an example of a curcuit using 5 resistors, the formula for calculating inductance would be L= R1 R3 R5 ---------- R2 1/C1 I've seen some very technical references to this in my searches, but nothing basic enough to be able to work with.The value of this information would be for low frequency work (160 and 80 meters). Thanks in advance Joe Ve3FMQ From amsoft@epix.net Thu Aug 10 15:33:15 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Gyrator Curcuit design Date: 8 Aug 1995 22:25:42 GMT Organization: Hewlett-Packard Lines: 45 Message-ID: <408o96$9ah@hpscit.sc.hp.com> References: NNTP-Posting-Host: hpscrj.scd.hp.com In article , Joseph Cooper wrote: >I am looking for information on a method of curcuit design call the 'Gyrator'. > What is of interest is that the design uses resistance, rather than >inductance, to create impedance. > >What the basic cuircuit looks like is a group of resistors in series of the >same value with one capacitor in that series line. > >For an example of a curcuit using 5 resistors, the formula for calculating >inductance would be > L= > > R1 R3 R5 >---------- > R2 1/C1 > >I've seen some very technical references to this in my searches, but nothing >basic enough to be able to work with.The value of this information would be >for low frequency work (160 and 80 meters). > >Thanks in advance > >Joe >Ve3FMQ There are two related gyrators that have 5 passives in series, plus 2 op amps tapped into the string at intermediate points. They are usually called the Bruton and Antoniou gyrators and are based on work by Riordan. (See references at end). The best treatment of these that I have seen is in Sedra and Brackett's book on active circuits. I would warn you that you need a GBW product in the op amps on the order of 100 times the product of Q and frequency, so that at 160 meters, you should be looking at 200 MHz op amps like the OPA620 or even more. Also, I have not seen any "basic" treatments of this complicated topic in my extensive literature searches for gyrators. Perhaps you should go back to passive inductors. References: Antoniou: Proc. IEE, Nov. 69, pp 1838-1850. Bruton: IEEE Trans. Circuit Theory, Aug. 69, pp 406-408 Riordan: Elec. Letters, 1967, pp 50-51. Rick Karlquist N6RK rkarlqu@scd.hp.com From amsoft@epix.net Thu Aug 10 15:33:16 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!cs.utexas.edu!geraldo.cc.utexas.edu!mickey.cc.utexas.edu!vcl From: vcl@mickey.cc.utexas.edu (Victor C. Limary) Newsgroups: sci.electronics,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Help! Need schematics for FM Transmitter Date: 8 Aug 1995 18:44:02 GMT Organization: The University of Texas at Austin, Austin, Texas Lines: 11 Message-ID: <408b9i$vk@geraldo.cc.utexas.edu> NNTP-Posting-Host: mickey.cc.utexas.edu X-Newsreader: TIN [version 1.2 PL2] Xref: grape.epix.net sci.electronics:138825 rec.radio.amateur.equipment:15552 rec.radio.amateur.homebrew:8808 Hi. I was wondering if anyone had schematics for a small FM transmitter. I need to design a wireless FM microphone for a school project. It needs to be capable to transmitting to at least 20 feet away, to an ordinary FM receiver. E-mails would be appreciated, but I will check the newsgroups. Thanks! -- Victor Limary |The University of Texas at Austin vcl@ccwf.cc.utexas.edu |http://ccwf.cc.utexas.edu/~vcl/ |http://www.utexas.edu/students/alphachi/ From amsoft@epix.net Thu Aug 10 15:33:17 1995 Path: grape.epix.net!news.sprintlink.net!news.interserv.net!usenet From: mike@nit-emh1.nit.disa.mil Newsgroups: rec.radio.amateur.homebrew Subject: HF Amp transformer Date: 9 Aug 1995 23:32:08 GMT Organization: InterServ News Service Lines: 7 Message-ID: <40bgho$ddp@data.interserv.net> NNTP-Posting-Host: 164.117.225.116 X-Newsreader: AIR News 3.X (SPRY, Inc.) Saw a few articals on using micro-wave oven transformers for HF Amps. I am very interested if these transformers can actually be used. Has anyone actually used one of these in an HF amp?? If any own has any information on this please let me now, I have access to a large qty of used micro-wave oven transformers and would be willing to provide for the shipping price only. If you have any infor please e-mail me at mike@nit-emh1.nit.disa.mil From amsoft@epix.net Thu Aug 10 15:33:18 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: HF Amp transformer Message-ID: <1995Aug10.152044.3496@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <40bgho$ddp@data.interserv.net> Date: Thu, 10 Aug 1995 15:20:44 GMT Lines: 19 In article <40bgho$ddp@data.interserv.net> mike@nit-emh1.nit.disa.mil writes: >Saw a few articals on using micro-wave oven transformers for HF Amps. I am very interested if these transformers >can actually be used. Has anyone actually used one of these in an HF amp?? If any own has any information >on this please let me now, I have access to a large qty of used micro-wave oven transformers and would be willing >to provide for the shipping price only. If you have any infor please e-mail me at > >mike@nit-emh1.nit.disa.mil AFAIK, microwave oven transformers are designed to saturate at the maggie design current, acting as a crude current regulator and peak current limiter. This probably isn't behavior you'd want from a linear amplifier supply. 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 amsoft@epix.net Thu Aug 10 15:33:18 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!crash!pebble!kurt.prochnow From: Kurt.Prochnow@pebble.cts.com (Kurt Prochnow) Date: 08 Aug 95 09:41:20 Newsgroups: rec.radio.amateur.homebrew Subject: Info. on Palomar Message-ID: <81e_9508081011@pebble.cts.com> X-FTN-To: Guy Scott Organization: Pebble Gateway Lines: 10 Palomar Engineers Box 462222 Escondido, California 92046 619-747-3343 619-747-3346 (fax) -- Any opinions expressed by this user are theirs and theirs alone. Pebble in the Sky - Escondido, CA - 619-743-2511 - V.34+ From amsoft@epix.net Thu Aug 10 15:33:19 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!howland.reston.ans.net!swrinde!sgigate.sgi.com!genmagic!bug.rahul.net!a2i!news.erinet.com!uunet!in2.uu.net!spcuna!news.columbia.edu!watsun.cc.columbia.edu!jbaltz From: jbaltz@watsun.cc.columbia.edu (Jerry B Altzman) Newsgroups: rec.radio.amateur.homebrew Subject: July QEX Date: 8 Aug 1995 04:44:06 GMT Organization: double ionizers association Lines: 5 Message-ID: <406q2m$iof@apakabar.cc.columbia.edu> NNTP-Posting-Host: watsun.cc.columbia.edu Has anyone received their July QEX yet? I'm still waiting for mine... //jbaltz jerry b. altzman Entropy just isn't what it used to be +1 212 650 5617 jbaltz@columbia.edu jbaltz@sci.ccny.cuny.edu KE3ML (HEPNET) NEVIS::jbaltz From amsoft@epix.net Thu Aug 10 15:33:19 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!news.bu.edu!bloom-beacon.mit.edu!newsfeed.internetmci.com!news.sprintlink.net!news.azstarnet.com!usenet From: Wes Stewart Newsgroups: rec.radio.amateur.homebrew Subject: Re: July QEX Date: 9 Aug 1995 02:06:38 GMT Organization: Arizona Daily Star - AZSTARNET Lines: 10 Message-ID: <40957e$l3q@news.azstarnet.com> References: <406q2m$iof@apakabar.cc.columbia.edu> NNTP-Posting-Host: sprite40.azstarnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b2 (Windows; I; 16bit) To: jbaltz@watsun.cc.columbia.edu jbaltz@watsun.cc.columbia.edu (Jerry B Altzman) wrote: >Has anyone received their July QEX yet? I'm still waiting for mine... > >//jbaltz >jerry b. altzman Entropy just isn't what it used to be +1 212 650 5617 >jbaltz@columbia.edu jbaltz@sci.ccny.cuny.edu KE3ML (HEPNET) NEVIS::jbaltz Nope! From amsoft@epix.net Thu Aug 10 15:33:20 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!hookup!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: ke4iof@aol.com (KE4IOF) Newsgroups: rec.radio.amateur.homebrew Subject: Re: July QEX Date: 9 Aug 1995 08:36:01 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 3 Sender: root@newsbf02.news.aol.com Message-ID: <40aa3h$4jt@newsbf02.news.aol.com> References: <40957e$l3q@news.azstarnet.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader I haven't either. My June issue was late too. Mark From amsoft@epix.net Thu Aug 10 15:33:21 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.dfn.de!RRZ.Uni-Koeln.DE!wmwap1.math.uni-wuppertal.de!schneide From: schneide@wrcs1.urz.uni-wuppertal.DE (Robert J. Schneider) Newsgroups: rec.radio.amateur.homebrew Subject: Re: July QEX Date: 9 Aug 1995 11:22:52 GMT Organization: University of Wuppertal Lines: 11 Message-ID: <40a5qc$rat@wmwap1.math.Uni-Wuppertal.DE> References: <406q2m$iof@apakabar.cc.columbia.edu> <40957e$l3q@news.azstarnet.com> NNTP-Posting-Host: wrds15.urz.uni-wuppertal.de X-Newsreader: TIN [version 1.2 PL2] Wes Stewart (N7WS@azstarnet.com) wrote: : jbaltz@watsun.cc.columbia.edu (Jerry B Altzman) wrote: : >Has anyone received their July QEX yet? I'm still waiting for mine... : > : >//jbaltz : >jerry b. altzman Entropy just isn't what it used to be +1 212 650 5617 : >jbaltz@columbia.edu jbaltz@sci.ccny.cuny.edu KE3ML (HEPNET) NEVIS::jbaltz : Nope! Also not! From amsoft@epix.net Thu Aug 10 15:33:22 1995 Path: grape.epix.net!news.sprintlink.net!uunet!in2.uu.net!spcuna!news.columbia.edu!watsun.cc.columbia.edu!jbaltz From: jbaltz@watsun.cc.columbia.edu (Jerry B Altzman) Newsgroups: rec.radio.amateur.homebrew Subject: Re: July QEX Date: 9 Aug 1995 16:30:11 GMT Organization: double ionizers association Lines: 14 Message-ID: <40anqj$7ju@apakabar.cc.columbia.edu> References: <406q2m$iof@apakabar.cc.columbia.edu> NNTP-Posting-Host: watsun.cc.columbia.edu In article <406q2m$iof@apakabar.cc.columbia.edu>, I wrote: >Has anyone received their July QEX yet? I'm still waiting for mine... I just called the ARRL about 3 minutes ago. They said that "the July QEX went out *this morning*" (9 Aug 1995) to which I replied "ahh, well the July QEX is now the August QEX, no?" and I was answered, "the August QEX will be coming out shortly" So there you go! //jbaltz jerry b. altzman Entropy just isn't what it used to be +1 212 650 5617 jbaltz@columbia.edu jbaltz@sci.ccny.cuny.edu KE3ML (HEPNET) NEVIS::jbaltz From amsoft@epix.net Thu Aug 10 15:33:24 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!howland.reston.ans.net!agate!!tvr From: tvr@boulez.CNMAT.Berkeley.EDU Newsgroups: rec.radio.amateur.homebrew Subject: Re: Longwave Transmitter Date: 08 Aug 1995 02:24:56 GMT Organization: CNMAT Lines: 84 Distribution: world Message-ID: References: <3vpd7v$sfb@insosf1.netins.net> <3vovg7$ju8@newsbf02.news.aol.com> <9508031906236221@minfox.com> NNTP-Posting-Host: boulez.cnmat.berkeley.edu In-reply-to: jim.horner@minfox.com's message of Fri, 4 Aug 1995 00:23:00 GMT I'm NOT an expert on the 'lowfer' band, i'm just learning about it myself. Hopefully, an active 'lowfer' can answer these questions more authoratively. However, i can clear a few things up. From the article "Ground Zero" (Popular Electronics-Oct.'94): 1750-Meter Experimenters' Band: - 160-190 kHz - Max. power-1watt - Max. antenna length-50 ft. including ground lead and transmission line - Modulation-any - Out of band emissions must be supressed by 20 dB. I have that one quoted in my WWW page simply because it contains a magazine reference. 50 ft is approximately 15 meters, as later posters have noted. I don't care what THAT book said. It was either a misprint or a typo on your part.... because I respectfully must imform all that the limit of the combined feedline and antenna system for transmitting can only be a maximum of 15 (fifteen) feet. No, it is 15 meters. (b) The total length of the transmission line, antenna, and ground lead (if used) shall not exceed 15 meters. [Sec. 15.217: Operation in the band 160-190 kHz.] Reference: http://www.pls.com:8001/cgi-bin/taos_doc.pl?unix+1+cfr+187927+query+%27Sec.+15.217%27%3acite+%25BREAK%25+cfr%3a (or type "'Sec. 15.217':cite" at http://www.pls.com:8001/his/cfr.html ) Someone asked about IDs: It is also interesting that you literally can make up your own callsign/id on there (trying not to duplicate an existing one) If you are allready a ham you can use your call as it is very unlikely that it is allready being used on vlf! Most IDs are 3 letters in lenght in the entire vlf band. I don't have the reference nearby, but i understand that the 'lowfer' folk use their callsign suffix. (I'm not sure what Advanced, Extra and folks with "by 1" calls use.) I wouldn't use an amateur call as the transmissions are clearly out of any amateur band. Exactly, and that's the reason for the callsign suffix convention. So, if i were to operate there, i would use PAG to identify and explain to anyone who asked that my amateur callsign is KD6PAG for purposes of providing a convenient mailing address and operating under Part 15. If you live near salt water, use it as a ground and place the x-mitter directly at the base of the antenna. The vertical portion would then be 15 feet ( constructed with a copper ribbon/tubing or multi-wire to compensate for R-loss) with a large capacity hat to bring the resonance down as far as possible without having the outer perimeter of the capacity hat fall below 20% of the vertical portion of the antennas' vertical mast I'm not sure what the 15 meters means. For example, i don't know whether it could be something like a 14 foot ferrite-rod with a 1 foot ground rod, both connected directly to the transmitter. That may be a "gray area" in the regulations. On the other hand, if you keep things real clean and don't annoy anyone, the question won't come up. (Of course, if you have a horrendously large receiving antenna, which is perfectly legal, non-hams won't know the difference, and questions might get asked.) If you're seriously interested, here's a useful reference: The monthly newsletter is called "The Lowdown" and is published by Bill Oliver, 45 Wildflower Road, Levittown, PA 19057. The cost is $15 a year. It cover all lowfer, medfer, and other interest in the VLF area. I find it to be quite interesting. Also, there is a couple of different systems available for computer operated beacons. A lot of activity in all areas of the country. Some are hams and other seem to be engineering types. I am in the process of building a station now. [daleh@skypoint.com (Dale A. Hagert), 23 Apr 1995] Have a good time, but behave yourself. -- KD6PAG (who is still learning) P.S. I'm still looking for a local (S.F. Bay Area) 'lowfer' to help me get started someday. From amsoft@epix.net Thu Aug 10 15:33:25 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!simtel!noc.netcom.net!news.sprintlink.net!uunet!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: looking for plans: CB base antenna Date: 8 Aug 1995 23:27:26 GMT Organization: Los Alamos National Laboratory Lines: 58 Message-ID: <408rsu$mop@newshost.lanl.gov> References: <40335t$15v@i-2000.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 1.1N (Windows; I; 16bit) To: daved@i-2000.com I built several of these for 10 meters, but they will work equally well on 11 meters (if your kid enjoys the CB he is twisted beyond belief, get him a Novice or Tech ham radio license guidebook from Radio Shack): | ^ | | | | | | | length: 103" CB or 99" for 10 meter ham | | | | (aluminum tubing | | or 1/2" galv. | | elect. conduit) | | | - T < insulator: block of wood or plastic I -clamp vert. element to insulator with I steel hose clamp(s) ___________________________ < 4 radials ea. 103" long > (side view of antenna) | | | | | Attach coax shield to radials ^/ -------/o\------- \ /\ T Attach coax center conductor to vert | element, may clamp under hose clamp | | | MAke the center plate of aluminum or whatever you have handy, 6 to 12 inches square will suffice. Attach the 4 radials to the center plate with screws and nuts for a good mechanical and electrical connection. The Center vertical element MUST be insulated from the radials (horizontal elements). This antenna will support itself just sitting on a flat roof or other surface, even out in the back/front yard on the ground. The higher you can get it of course the better it will perform - as with ANY antenna. -- *********** Jim Devenport WB5AOX ************** * PO Box 445, McIntosh NM 87032 * * http://nis-www.lanl.gov/~jdport/ * *********************************************** From amsoft@epix.net Thu Aug 10 15:33:26 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!sdd.hp.com!svc.portal.com!shell.portal.com!jobe.shell.portal.com!jkesling From: jkesling@shell.portal.com (John Darrell Kesling) Newsgroups: rec.radio.amateur.homebrew Subject: MDS downconverters good for parts? Date: 9 Aug 1995 21:40:02 GMT Organization: Portal Communications Company -- 408/973-9111 (voice) 408/973-8091 (data) Lines: 23 Message-ID: <40b9vi$8s8@news1.shell> NNTP-Posting-Host: jobe.shell.portal.com X-Newsreader: TIN [version 1.2 PL2] I recently obtained several MDS downconverters. I believe they had been used by a now defunct local business to provide direct to your home premium TV broadcasts. They have an "N" connector input and two "F" connectors for output, one is labled "test" the other "TV". They are labled "INPUT MDS CHANNEL 1" and "OUTPUT CHANNEL 3". They are obviously designed to be mast mounted. They appear to have a preamp built in as well as a crystal controlled oscillator and mixer stages. Does anyone know the frequency of MDS CHANNEL 1? Should they be scrapped for parts, converted to another frequency, used as-is or thrown away? Other suggestions? John -- ------------------------------------------------------------------------------ John Kesling - jkesling@eng.utoledo.edu or jkesling@shell.portal.com ------------------------------------------------------------------------------ WA8ZGO - via AX.25 packet radio WA8ZGO@W8HHF.OH.USA ------------------------------------------------------------------------------ From amsoft@epix.net Thu Aug 10 15:33:27 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: MDS downconverters good for parts? Date: Wed, 09 Aug 95 22:31:24 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 38 Distribution: world Message-ID: <40bdo2$4d5@nuclear.microserve.net> References: <40b9vi$8s8@news1.shell> NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 jkesling@shell.portal.com (John Darrell Kesling) wrote: >I recently obtained several MDS downconverters. >Does anyone know the frequency of MDS CHANNEL 1? > >Should they be scrapped for parts, converted to another frequency, >used as-is or thrown away? Other suggestions? MDS1: 2150 to 2156 MHz Visual Carrier: 2154.75 Color Subcarrier: 2151.17 Aural Carrier: 2150.25 MDS2: 2156 to 2162 MHz Visual Carrier: 2160.75 Color Subcarrier: 2157.17 Aural Carrier: 2156.25 Note that the relationship of the carriers in both MDS channels is inverted relative to normal TV broadcasts. BTW, I haven't seen MDS-only downconverters in quite some time. Most of these were used in the mid 70's to early 80's, following which ITFS and MMDS (2.5 - 2.7 GHz) began gaining popularity for commercial multichannel "Wireless Cable" use. Note that the video standard at the higher MMDS band is identical to "normal" television broadcasts. Later model downconverters, some of which have dual front ends for receiving both MDS and MMDS, use a L.O. located between the two services. Thus, MDS is reinverted on conversion, while MMDS is not. Sorry, no suggestions for a good use. 73, Jack WB3U From amsoft@epix.net Thu Aug 10 15:33:28 1995 Path: grape.epix.net!news.sprintlink.net!hookup!news.mathworks.com!newsfeed.internetmci.com!tank.news.pipex.net!pipex!howland.reston.ans.net!agate!!tvr From: tvr@boulez.CNMAT.Berkeley.EDU Newsgroups: sci.electronics,rec.radio.amateur.homebrew Subject: Re: Modulating VCO's Date: 08 Aug 1995 03:59:00 GMT Organization: CNMAT Lines: 38 Message-ID: References: <401inl$qkr@dallas1.connect.net> NNTP-Posting-Host: boulez.cnmat.berkeley.edu In-reply-to: daveb@connect.net's message of Sun, 06 Aug 1995 05:06:08 GMT Xref: grape.epix.net sci.electronics:138707 rec.radio.amateur.homebrew:8793 I'm looking for some pointers to detailed work on modulating vco's and synthesizers for transmitters. I'm specificaly looking for more information on Dual port modulation for FSK data. Technical reports are fine, application notes, etc. A recent project or two on DDS (direct digital synthesis) in either "QST" or "73" magazine uses the HSP45102, simplist of the Harris DDS chips, along with a video DAC as a VCO intended for HF use. That article doesn't use the feature, but the chip can store two frequencies. You put your digital input into the frequency select input of the DDS chip and load the right data into the chip and you get instant FSK. That datasheet is available via their AnswerFAX service: http://www.semi.harris.com/datasheets/dsp/hsp45102/ You'll have to use a mixer or multipliers to get it up into a band where it'll make much difference. (Be careful about spectral purity if you start from a "73" article, as i don't recall seeing very much documentation in their articles about that and it makes me wonder about that. If you're operating under an amateur radio license, you can't hide behind Sec. 15.23; e.g. it doesn't matter if you "may not possess the means to perform the measurements for determining compliance with the regulations", you still must comply.) I suppose that you might be able to do something like that with one of the Motorola synthesizer chips that uses parallel inputs, choose parameters very carefully and can come up suitable configuration in the feedback loop. However, i don't think that's necessary. Their ordinary transmitter ICs should work just fine for what you want, you just have to figure out where to inject the signal. See the MC13175/176 UHF transmitter IC data sheet for details (includes both AM and FM modulation). These datasheets can be obtained from the Motorola fax-back service, which is available via: http://motserv.indirect.com/home2/fax_rqst.html as i don't think they have either of those devices on-line yet. -- KD6PAG (networking old-timer, RF newbie) From amsoft@epix.net Thu Aug 10 15:33:29 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!usenet.ins.cwru.edu!gatech!news.mathworks.com!newshost.marcam.com!usc!howland.reston.ans.net!newsfeed.internetmci.com!uunet!in1.uu.net!news.deltanet.com!news.deltanet.com!jlundgre From: jlundgre@delta1.deltanet.com (John Lundgren) Newsgroups: sci.electronics,rec.radio.amateur.homebrew Subject: Re: Modulating VCO's Followup-To: sci.electronics,rec.radio.amateur.homebrew Date: 9 Aug 1995 07:39:32 GMT Organization: Delta Internet Services, Anaheim, CA Lines: 25 Message-ID: <409onk$t2p@news2.deltanet.com> References: <401inl$qkr@dallas1.connect.net> NNTP-Posting-Host: delta1.deltanet.com X-Newsreader: TIN [version 1.2 PL2] Xref: grape.epix.net sci.electronics:138903 rec.radio.amateur.homebrew:8819 David Bengtson (daveb@connect.net) penned: : I'm looking for some pointers to detailed work on modulating vco's and : synthesizers for transmitters. I'm specificaly looking for more : information on Dual port modulation for FSK data. Technical reports : are fine, application notes, etc. : Thanks for any pointers : David Bengtson : Yes, these are my opinions : Looking for Old HP-41 Calculators and Accessories For NBFM, you can get away with switching a capacitor in and out of being in parallel with a crystal. That way, you can have your crystal and eat it, too. ;-) -- #==================================================================# | John Lundgren - Elec Tech - Info Tech Svcs | jlundgre@delta1 | | Rancho Santiago Community College District | .deltanet.com | | 17th St. at Bristol \ Santa Ana, CA 92706 | or @pop.rancho | | Standard Disclaimers Apply (Blah-Blah...) | .cc.ca.us | | "He who toys with the most dies, wins." | Dr. Kevorkian? | #===========PGP=key=available=upon=request=========================# From amsoft@epix.net Thu Aug 10 15:33:32 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!cs.utexas.edu!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: sci.electronics,rec.radio.amateur.homebrew Subject: Re: Modulating VCO's Date: Wed, 09 Aug 95 08:38:21 GMT Organization: TSE Systems Lines: 66 Message-ID: <409s83$ao8@solaris.cc.vt.edu> References: <401inl$qkr@dallas1.connect.net> <409onk$t2p@news2.deltanet.com> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 Xref: grape.epix.net sci.electronics:138915 rec.radio.amateur.homebrew:8822 In article <409onk$t2p@news2.deltanet.com>, jlundgre@delta1.deltanet.com (John Lundgren) wrote: >David Bengtson (daveb@connect.net) penned: >: I'm looking for some pointers to detailed work on modulating vco's and >: synthesizers for transmitters. I'm specificaly looking for more >: information on Dual port modulation for FSK data. Technical reports >: are fine, application notes, etc. > >: Thanks for any pointers > >: David Bengtson >: Yes, these are my opinions >: Looking for Old HP-41 Calculators and Accessories > >For NBFM, you can get away with switching a capacitor in and out of being >in parallel with a crystal. That way, you can have your crystal and eat >it, too. ;-) > > This is however, not what David is after, as he specifically mentioned vco's and synthesizers. If you are using the variable crystal approach, it is much better to use a varactor diode in conjunction with the crystal so continuous frequency changes can be effected. Simply switching leads to a lot of undesired sidebands. The conventional "single oscillator" (my term for it) VHF FM transciever is turning out to be quite inadequate for high-speed FSK packet, at least in the versions supplied by the Japanese manufacturers. The primary limitation of this design is that the PLL must re-lock on every change from transmit to receive and vice versa. Thus the radio is unable to transmit or receive for a period of 100 or more milliseconds at the beginning and end of each transmission. Since 9600 baud packets can be less than 25 ms long, this is a tremendous waste of channel capacity. Another major problem with the single oscillator set is that in order to tune fast from TX/RX, the loop filter must have a wide bandwidth, on the order of 100 Hz or more. But with a wide feedback bandwidth, the PLL will "fight" the modulation, causing a great deal of distortion of the transmitted signal unless rather elaborate compensation is used. The compensation is likely to require individual adjustment for each unit. It may be possible to lower the bandwidth to a few Hz once lock has been achieved, but this is likely to push out the RX->TX transition time even more. A much better design is a heterodyne system. Here the PLL runs continuously at the LO frequency. Thus the radio is always ready to receive. When transmitting is required, a crystal oscillator at the IF frequency is switched on and mixed with the LO. The output of the mixer has 3 main components, LO-IF, LO, and LO+IF. This latter signal is on the correct frequency for transmission (assuming simplex operation. For offset channels, either the VCO/LO can be retuned (slow) or another crystal for each frequency split provided (expensive)). A fairly good filter is required to reject the spurious outputs from the mixer, before the power amplifier. Modulation is applied to the heterodyne oscillator using VXO techniques. The PLL will not distort the modulation, and it also remains locked during the transition from receive to transmit and back. Thus very fast changeover time can be achieved. This type of design used to be somewhat popular in commercial equipment. The Santec ST-144uP 2-meter HT is one example. However, the cost of the extra crystal, mixer, and filter, as well as the inherent lack of wide transmit frequency coverage (without readjusting the filter anyway) has caused it to become extinct in today's market. -Mike KD4QDM From amsoft@epix.net Thu Aug 10 15:33:32 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!hookup!news.mathworks.com!newsfeed.internetmci.com!news.uoregon.edu!news.bc.net!torn!mcshub!informer1.cis.McMaster.CA!usenet From: szarkas@FHS.McMaster.CA Newsgroups: sci.electronics,rec.radio.amateur.homebrew Subject: Re: Modulating VCO's Date: 9 Aug 1995 02:23:03 GMT Organization: McMaster University, Hamilton, Ontario, Canada (NewServer) Lines: 6 Message-ID: <409667$egn@informer1.cis.McMaster.CA> References: <401inl$qkr@dallas1.connect.net> NNTP-Posting-Host: abb-annex1-slip23.cis.mcmaster.ca Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: tvr@boulez.CNMAT.Berkeley.EDU Xref: grape.epix.net sci.electronics:138925 rec.radio.amateur.homebrew:8824 I am not good enough to answer your question but I am wondering if you could help me? I am trying to design a transmiter that could modulate the entire AM band. Any hints? Specifically do you know of a chip that I could perhaps VCO control and hence sweep the AM band. Steve S. From amsoft@epix.net Thu Aug 10 15:33:33 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsjunkie.ans.net!swiss.ans.net!upsnews.ups.com!brownie.iim.ups.com!iim2tlm From: iim2tlm@iim.ups.com (Tom Mosher) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Modulating VCO's Date: 9 Aug 1995 19:34:34 GMT Organization: II Morrow, Inc. Lines: 24 Message-ID: <40b2ka$24q@brownie.iim.ups.com> References: <401inl$qkr@dallas1.connect.net> <409onk$t2p@news2.deltanet.com> <409s83$ao8@solaris.cc.vt.edu> NNTP-Posting-Host: seal.iim.ups.com X-Newsreader: News Xpress Version 1.0 Beta #3 In article <409s83$ao8@solaris.cc.vt.edu>, mkeitz@bev.net (Mike Keitz) wrote: > .... The primary >limitation of this design is that the PLL must re-lock on every change from >transmit to receive and vice versa. Thus the radio is unable to transmit >or receive for a period of 100 or more milliseconds at the beginning and >end of each transmission. Since 9600 baud packets can be less than 25 ms >long, this is a tremendous waste of channel capacity. Howdy, You later point out that you're assuming simplex operating. In a simple design, the PLL does not need to be re-programmed from rx to tx, since it can operate at the same frequency (if the IFs for rx and tx are the same). A single PLL simplex transceiver can be made to switch from rx to tx very rapidly, but this isn't a common technique because the market for simplex-only radios is very small. 73 de Tom - KC7AGK ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Tom Mosher II Morrow, Inc. iim2tlm@iim.ups.com My views do not represent those of II Morrow or United Parcel Service. From amsoft@epix.net Thu Aug 10 15:33:35 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!venus.sun.com!male.EBay.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: sci.electronics,rec.radio.amateur.homebrew Subject: Re: Modulating VCO's Date: 9 Aug 1995 22:55:05 GMT Organization: SunSoft South, Los Angeles, CA Lines: 101 Message-ID: <40bec9$879@abyss.West.Sun.COM> References: <401inl$qkr@dallas1.connect.net> <409onk$t2p@news2.deltanet.com> <409s83$ao8@solaris.cc.vt.edu> NNTP-Posting-Host: sunspot.west.sun.com Xref: grape.epix.net sci.electronics:139023 rec.radio.amateur.homebrew:8846 In article <409s83$ao8@solaris.cc.vt.edu>, Mike Keitz wrote: >In article <409onk$t2p@news2.deltanet.com>, > jlundgre@delta1.deltanet.com (John Lundgren) wrote: >>David Bengtson (daveb@connect.net) penned: >>: I'm looking for some pointers to detailed work on modulating vco's and >>: synthesizers for transmitters. I'm specificaly looking for more >>: information on Dual port modulation for FSK data. Technical reports >>: are fine, application notes, etc. >> >>: Thanks for any pointers >> >>: David Bengtson >>: Yes, these are my opinions >>: Looking for Old HP-41 Calculators and Accessories >> >>For NBFM, you can get away with switching a capacitor in and out of being >>in parallel with a crystal. That way, you can have your crystal and eat >>it, too. ;-) >> >> >This is however, not what David is after, as he specifically mentioned >vco's and synthesizers. If you are using the variable crystal approach, it > is much better to use a varactor diode in conjunction with the crystal so >continuous frequency changes can be effected. Simply switching leads to a >lot of undesired sidebands. > >The conventional "single oscillator" (my term for it) VHF FM transciever is >turning out to be quite inadequate for high-speed FSK packet, at least in >the versions supplied by the Japanese manufacturers. The primary >limitation of this design is that the PLL must re-lock on every change from >transmit to receive and vice versa. Thus the radio is unable to transmit >or receive for a period of 100 or more milliseconds at the beginning and >end of each transmission. Since 9600 baud packets can be less than 25 ms >long, this is a tremendous waste of channel capacity. A single oscillator PLL synthesizer can lock up in considerably less than 100mS. I have several Motorola MCX100 transceivers that are specified to lock up in less than 3mS. The key is to use an adaptive loop filter; some designs shunt diode(s) across resistors in the loop filter to do this, but it is better to use switches like 4066 quad to modify the loop filter in a predictable manner. >Another major problem with the single oscillator set is that in order to >tune fast from TX/RX, the loop filter must have a wide bandwidth, on the >order of 100 Hz or more. But with a wide feedback bandwidth, the PLL will >"fight" the modulation, causing a great deal of distortion of the >transmitted signal unless rather elaborate compensation is used. The >compensation is likely to require individual adjustment for each unit. It >may be possible to lower the bandwidth to a few Hz once lock has been >achieved, but this is likely to push out the RX->TX transition time even >more. You are correct to point out the lock-up time vs. VCO modulation trade-off. However, keep in mind that loop bandwidth choice is also influenced by reference noise considerations, though this is often not a big issue. Don't overlook the use of "two point" modulation; modulation is applied to the VCO and also to the reference. For example, the Motorola MCX100 I mentioned above also offers this capability. You may be able to retrofit the ability to modulate the reference to an existing synth, but be very careful not to make your reference source become noisy and drifty. Whenever you make any changes to a PLL synth, you should always do the math first to make sure you don't break the PLL synth in some unexpected way (like it won't lock up at all ;-). >A much better design is a heterodyne system. Here the PLL runs >continuously at the LO frequency. Thus the radio is always ready to >receive. When transmitting is required, a crystal oscillator at the IF >frequency is switched on and mixed with the LO. The output of the mixer >has 3 main components, LO-IF, LO, and LO+IF. This latter signal is on the >correct frequency for transmission (assuming simplex operation. For offset >channels, either the VCO/LO can be retuned (slow) or another crystal for >each frequency split provided (expensive)). A fairly good filter is >required to reject the spurious outputs from the mixer, before the power >amplifier. >Modulation is applied to the heterodyne oscillator using VXO techniques. >The PLL will not distort the modulation, and it also remains locked during >the transition from receive to transmit and back. Thus very fast >changeover time can be achieved. This type of design used to be somewhat >popular in commercial equipment. The Santec ST-144uP 2-meter HT is one >example. However, the cost of the extra crystal, mixer, and filter, as >well as the inherent lack of wide transmit frequency coverage (without >readjusting the filter anyway) has caused it to become extinct in today's >market. The extra complication of the VXO, mixer, and adequate mixer image rejection are the major issues with this. The transmit filter often ends up being a set of helical resonators with the inherent narrow bandwidth you mention. A decent two point modulation design can give you the necessary DC modulation response and TX/RX switchover time with consideranbly less complication and also remove the possibility of inadequate transmit image suppression. -- * 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 amsoft@epix.net Thu Aug 10 15:33:37 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!hookup!news.mathworks.com!tank.news.pipex.net!pipex!howland.reston.ans.net!news.sprintlink.net!news.connect.net!usenet From: daveb@connect.net (David Bengtson) Newsgroups: sci.electronics,rec.radio.amateur.homebrew Subject: Re: Modulating VCO's Date: Thu, 10 Aug 1995 03:19:04 GMT Organization: Connection Technologies Lines: 37 Message-ID: <40btv5$cpn@dallas1.connect.net> References: <401inl$qkr@dallas1.connect.net> <409onk$t2p@news2.deltanet.com> <409s83$ao8@solaris.cc.vt.edu> <40bec9$879@abyss.West.Sun.COM> NNTP-Posting-Host: a1p07.connect.net X-Newsreader: Forte Free Agent 1.0.82 Xref: grape.epix.net sci.electronics:139056 rec.radio.amateur.homebrew:8854 myers@West.Sun.COM (Dana Myers) wrote: >In article <409s83$ao8@solaris.cc.vt.edu>, Mike Keitz wrote: >>In article <409onk$t2p@news2.deltanet.com>, >> jlundgre@delta1.deltanet.com (John Lundgren) wrote: Much Deleted, due to a nasty newsposter. More grungy details are in order. This is going into a actual shipping product, so things like transmit splatter, modulation accuracy, lock time are big players. This is also to be powered off of a single AAA cell, so total current consumption is a big issue, also. The actual modulation scheme is a 4 level FSK, with deviation frequencies of +/- 800 Hz and +/- 2400 Hz. The frequencies must be within +/- 40 Hz for the system to work, adding another little bit of Joy. The current plan is to use a Dual port scheme, where the modulation is appiled to both the reference oscillator and the VCO. My concerns with this is that the parts count starts to go way up, along with the circuit complexity. However, there appears to be no way around it, and no one has suggested any other solutions. I have perused my synthesizer books, and there appears to be no real mention of modulation in any or them, indicating the appropriate math/simulations to perform. I have MDS (HP's Microwave Design System) to use for simulation, so simulations are another possibility. However, I haven't seen any real detailed treatments of modulation at all, which is why I posted the base message, looking for suggestions on references to track down. Dave Bengtson David Bengtson Yes, these are my opinions Looking for Old HP-41 Calculators and Accessories From amsoft@epix.net Thu Aug 10 15:33:38 1995 Newsgroups: sci.electronics,rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Modulating VCO's Message-ID: <1995Aug10.152731.3580@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <401inl$qkr@dallas1.connect.net> <409onk$t2p@news2.deltanet.com> <409s83$ao8@solaris.cc.vt.edu> <40bec9$879@abyss.West.Sun.COM> <40btv5$cpn@dallas1.connect.net> Date: Thu, 10 Aug 1995 15:27:31 GMT Lines: 39 Xref: grape.epix.net sci.electronics:139144 rec.radio.amateur.homebrew:8864 In article <40btv5$cpn@dallas1.connect.net> daveb@connect.net (David Bengtson) writes: > >Much Deleted, due to a nasty newsposter. > >More grungy details are in order. This is going into a actual shipping >product, so things like transmit splatter, modulation accuracy, lock >time are big players. This is also to be powered off of a single AAA >cell, so total current consumption is a big issue, also. The actual >modulation scheme is a 4 level FSK, with deviation frequencies of +/- >800 Hz and +/- 2400 Hz. The frequencies must be within +/- 40 Hz for >the system to work, adding another little bit of Joy. > >The current plan is to use a Dual port scheme, where the modulation is >appiled to both the reference oscillator and the VCO. My concerns with >this is that the parts count starts to go way up, along with the >circuit complexity. However, there appears to be no way around it, and >no one has suggested any other solutions. > >I have perused my synthesizer books, and there appears to be no real >mention of modulation in any or them, indicating the appropriate >math/simulations to perform. I have MDS (HP's Microwave Design System) >to use for simulation, so simulations are another possibility. >However, I haven't seen any real detailed treatments of modulation at >all, which is why I posted the base message, looking for suggestions >on references to track down. Perhaps you're going at this the wrong way. If you want a 4-level modulation, then perhaps you should be considering a pair of multipliers in phase quadrature on the output of the synthesizer instead of modulating it directly. With the appropriate modulating waveform, you can generate any arbitrary output you might need. The synthesizer is then just a reference carrier and can be of conventional single loop design. 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 amsoft@epix.net Thu Aug 10 15:33:39 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!uunet!in2.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: mfschick@aol.com (MFSCHICK) Newsgroups: rec.radio.amateur.homebrew Subject: Need 3-500Z specs for modifying HF amp Date: 8 Aug 1995 17:03:25 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 14 Sender: root@newsbf02.news.aol.com Message-ID: <408jet$iac@newsbf02.news.aol.com> Reply-To: mfschick@aol.com (MFSCHICK) NNTP-Posting-Host: newsbf02.mail.aol.com I have an old Swan Mark I amp that I would like to modify and improve for 3-28MHz. This amp has two 3-500Z tubes in push-pull, cathode driven AB2 configuration. One of the modifications I would like to do is to install a tuned Pi-L input filter to help cut out harmonics, etc. I am trying to find the characteristics for the 3-500Z tubes so I can calculate the component values in the tuned filter, but haven't had any luck. Does anyone know what the input impedance, plate impedance and other parameters of this tube are in a ground grid arrangement (plate voltage of 2.5KV) and how to calculate the actual impedance see by the filter when two of these tubes are in connected in parallel in the amp? Any help on the subject would be appreciated and thanks in advance. Martin, KA4IWG MFSCHICK@AOL.COM From amsoft@epix.net Thu Aug 10 15:33:42 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!cs.umd.edu!zombie.ncsc.mil!simtel!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: Need 3-500Z specs for modifying HF amp Date: 9 Aug 1995 01:13:58 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 98 Sender: root@newsbf02.news.aol.com Message-ID: <409g6m$t23@newsbf02.news.aol.com> References: <408jet$iac@newsbf02.news.aol.com> Reply-To: w8jitom@aol.com (W8JI Tom) NNTP-Posting-Host: newsbf02.mail.aol.com Hi Martin, >I have an old Swan Mark I amp that I would like to modify and improve >for 3-28MHz. >One of the modifications I would like to do is to install a tuned Pi-L input >filter to help cut out harmonics, etc. A Pi-L input filter (or even output) will not offer much, if any, improvement in harmonic suppression. The layout (component placement, connection points, and lead dress) and shielding are much more important, especially with high order harmonics. Tuned input circuits can be strange animals as to their effects on harmonic levels, efficiency, and IMD performance. I have measured IMD and efficiency deterioration when a tuned input was added, as well as cases that showed improvement! To be safe I recommend a low pass pi-network with a Q of 2 to 5 placed very close to the cathodes of the tubes (minimal lead length) or using high capacitance (very low impedance line) if the input circuit has to be located some distance from the tubes. Placing a tuned input a fair distance (even 15 inches or so) from the tube can kill high end (20 meter and higher) efficiency unless a very low Z line is used. >I am trying to find the characteristics for the 3-500Z tubes so I can >calculate the component values in the tuned filter, but haven't had any luck. >Does anyone know what the input impedance, plate impedance and other >parameters of this tube are in a ground grid arrangement (plate voltage of >2.5KV) and how to calculate the actual impedance see by the filter when >two of these tubes are in connected in parallel in the amp? The input Z will be around 50 ohms or slightly higher for two tubes in a good layout. There will be some parallel capacitive reactance that becomes important above 10 MHz, and usually some shunt L (from the filament choke) on the low end. The best way to set up the input in this amplifier type is to place four 220 ohm non-inductive resistors from each filament pin to chassis. The tubes are left in the sockets and the input is aligned with the power off and tubes cold with some type of low power RF impedance measuring device like an SWR Analyzer or meter. The plate impedance is a direct function of the plate current and voltage, and conduction angle of the tube. The output source impedance is the RF anode voltage at the fundamental frequency over the available anode circuit RF current, so it changes with voltage to current ratio and is independent of feedback or the actual type of tube. This is the impedance that must be conjugately matched to the load for maximum efficiency. ;-) At full CCS power of 1200 watts output (2500 v anode, 800 mA, 200 degree conduction angle) I calculate 1600 ohms approximately. At lower output power levels with 2500 volts fixed supply the impedance will rise, at higher power levels it will decrease. The output network is typically designed for the desired Q at maximum power, and the Q is allowed to increase if the power level is decreased. This insures sufficient harmonic suppression and proper network operation at maximum power...where it is most important. A range of 10 to 20 would probably be acceptable, the lower Q resulting in less tank heating but slightly less harmonic suppression, and the higher Q resulting in slightly more tank heating but a little bit better harmonic suppression on low order harmonics. Most air variable amplifiers with large tubes operating at high voltages must have the Q compromised to hit both ends of the HF spectrum. But usually there is very little change in efficiency or high order harmonic suppression if the Q is changed over a two to one (or larger) ratio as long as the components and tank layout are reasonably good, so don't be overly concerned with extreme accuracy. Just try to meet or exceed the minimum Q desired at full power (the Q will nearly double if you operate at half power with the same anode voltage anyway). Varian will send you details on calculating the effective plate impedance in a book called "The Care and Feeding of Power Grid Tubes" and a 3-500 data sheet. Call them, they have application engineers that love to be bothered! 73 Tom From amsoft@epix.net Thu Aug 10 15:33:42 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need 3-500Z specs for modifying HF amp Date: Wed, 09 Aug 95 22:14:47 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 13 Distribution: world Message-ID: <40bcou$4d5@nuclear.microserve.net> References: <408jet$iac@newsbf02.news.aol.com> NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 mfschick@aol.com (MFSCHICK) wrote: >I have an old Swan Mark I amp that I would like to modify and improve >for 3-28MHz. Rather than reinvent the wheel, why not just look in back copies of the ARRL Handbook? That would be a lot simpler than designing the entire tank circuit from scratch. At the very least, you would also see how others have built these, and maybe get some ideas regarding other component values, like coupling caps and plate chokes. 73 & GL, Jack WB3U From amsoft@epix.net Thu Aug 10 15:33:46 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.dacom.co.kr!news.netins.net!news.netins.net!negaard From: negaard@draagen.graceland.edu (David Negaard (Oberon-)) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Optoisolator cross-reference help and PAL programming information Date: 08 Aug 1995 17:15:34 GMT Organization: INS Info Services, Des Moines, Iowa, USA Lines: 48 Distribution: world Message-ID: References: <1995Aug5.022643.17726@emba.uvm.edu> NNTP-Posting-Host: draagen.graceland.edu In-reply-to: ajcummin@moose.uvm.edu's message of Sat, 5 Aug 1995 02:26:43 GMT >>>>> "Aaron" == Aaron Cummings writes: >>>>> David Negaard (Oberon-) (negaard@draagen.graceland.edu) wrote: >> [...] Aaron> By looking at the schematic, you should be able to determine Aaron> what you need for an optoisolator - I'm guessing that it is Aaron> nothing too exotic, probably just a bipolar output...T.I. makes Aaron> several, check your Digi_key catalog. Got the optoisolator handled, I think: I've gotten several e-mail messages indicating the manufacturer, and if I can't cross-reference it with that info, I remember seeing one in the Mouser catalog that looked like a functional equivalent. >> The other part of the project that's missing is the PAL used to >> decode the PC bus logic. It's a 20L10 and I can get the part, but >> I don't know how to program it. Maybe I'm confused, but one must >> program Programmable Array Logic, mustn't one? Aaron> Yes, you will need to program the PAL, and it is not a trivial Aaron> process. Tools exist for developing PAL programs, but they Aaron> cost $$ - Can you get away with just using logic gates??? I _think_ I _probably_ could do that, but I'm really at the outer limits of my current understanding, now. The text that came with the schematics is minimal, and so I'm not absolutely sure how things are being decoded. Is there anyone who might be able to help me figure out what I could do to substitute gates for the PAL? Like I said, I've got the schematic; all that's missing is artwork (which I can probably do without) and the logic of the address decoder. I even have the source code (of course) for the driver programs for this card, for Linux, if that would be any help at all. >> [...] >> Is there any help available for me out there? So far there's been quite a bit of help for me, and with a little more, I'll be on the home stretch for this project. I also want to publicly thank everyone who's written or posted already. Everyone's been really helpful. -- o David Negaard o negaard@graceland.edu o Help Desk Technician o http://www.graceland.edu/~negaard o 700 College Avenue o linux-phile o Lamoni, IA 50140 o 73 de KB0PXK From amsoft@epix.net Thu Aug 10 15:33:46 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!io.org!torfree!freenet.toronto.on.ca!ai657 From: ai657@freenet.toronto.on.ca (Paul Egan) Subject: PCB & Iron-on transfer? Message-ID: Sender: ai657@torfree.net (Paul Egan) Reply-To: ai657@freenet.toronto.on.ca (Paul Egan) Organization: Toronto Free-Net Inc., Toronto, Ontario, Canada Date: Thu, 10 Aug 1995 15:10:53 GMT Lines: 10 I have heard about this method but can't find the product. I believe that the material is run through a photocopier and then ironed to a copper clad board. Sounds like a quick way of getting to the etching stage, without having to use photo-sensitized boards and developer. Any help would be appreciated. Thanks. Paul VE3GFY From amsoft@epix.net Thu Aug 10 15:33:47 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!news.cyberstore.ca!vanbc.wimsey.com!news.rmii.com!newsjunkie.ans.net!gatech!newsfeed.internetmci.com!news.sprintlink.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: Power Supply comments Date: 10 Aug 95 14:39:33 GMT Organization: ucsd usenet gateway Lines: 28 Message-ID: <9507108080.AA808069839@mails.imed.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu In article , by668@FreeNet.Carleton.CA says... > >I want to build a 13.5 Vdc 20 Amp. martvin@ionet.net (Martin T. Vinson) wrote Not to dampen your creative spirit, but take it from one who has built many, many (many) power supplies, etc.....by the time you can buy all of the parts (including a cabinet to put it in) you can pay for a very nice Astron power supply....have fun. KN6UG -------------------------------- I agree with Martin with two provisos. If you have a VERY well stocked junk box the cost can be mitigated. The MOST expensive parts are the transformer, heat sink, and the case. I have built projects where the store bought case cost twice what the components inside cost. The second provisio is that if you get joy from building, then a power supply can be a rewarding project! They can be as simple as the ones that have a zener reference and several transistors which provide no protection to the supply or the circuit being supplied all the way up to fully thermal, over voltage, over current protected supplies. I have seen several references to ideas in all of this range mentioned over the last couple of days. I am in the process of building a design (in the works for a year now) that is at the high end for a remote packet node for TexNet. Let me know if you still have questions. Ray Mack WD5IFS mack@mails.imed.com From amsoft@epix.net Thu Aug 10 15:33:48 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!news.duke.edu!zombie.ncsc.mil!news.gmi.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!pacbell.com!amdahl.com!netcomsv!uucp3.netcom.com!lafn.org!lafn.org!ak119 From: ak119@lafn.org (Rothan Maxwell) Subject: QRP-L list X-Nntp-Posting-Host: lafn.org Message-ID: <1995Aug8.230444.25901@lafn.org> Sender: news@lafn.org Reply-To: ak119@lafn.org (Rothan Maxwell) Organization: The Los Angeles Free-Net Date: Tue, 8 Aug 1995 23:04:44 GMT Lines: 9 Hello! I'm looking for info on subscribing to the QRP-L list. If You have info I would appreciate it if you could e-mail me. Thanks 73's and 72's max (Nu6u) From amsoft@epix.net Thu Aug 10 15:33:48 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!pacbell.com!amdahl.com!netcomsv!uucp3.netcom.com!lafn.org!lafn.org!ak119 From: ak119@lafn.org (Rothan Maxwell) Subject: QRP-L Thanks! X-Nntp-Posting-Host: lafn.org Message-ID: <1995Aug9.152332.13282@lafn.org> Sender: news@lafn.org Reply-To: ak119@lafn.org (Rothan Maxwell) Organization: The Los Angeles Free-Net Date: Wed, 9 Aug 1995 15:23:32 GMT Lines: 5 Thanks for the info on the QRP-L list Guys cu on the list...Rothan (nu6u) 72's From amsoft@epix.net Thu Aug 10 15:33:49 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon From: Leon Heller Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Subject: Re: Rotary encoders Date: Mon, 07 Aug 95 18:32:37 GMT Organization: Home Lines: 22 Distribution: world Message-ID: <807820357snz@lfheller.demon.co.uk> References: <4051b3$hf6@lyra.csx.cam.ac.uk> Reply-To: Leon@lfheller.demon.co.uk X-NNTP-Posting-Host: lfheller.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 Xref: grape.epix.net rec.radio.amateur.homebrew:8796 rec.radio.shortwave:56718 rec.radio.amateur.digital.misc:9934 sci.electronics:138724 In article <4051b3$hf6@lyra.csx.cam.ac.uk> andrew@pmms.cam.ac.uk "Andrew Thomason" writes: > Do rotary encoders "go off" after a year or so? Can they be repaired? Do they > lose > their magnetism or is it just dust which gets inside? > > I have a couple of digital radios which can be tuned by a knob, one cheap, one > expensive. In both cases, after a year's use, the frequency started to dither > around slightly whilst I smoothly turned the knob. I had thought this was due > to a brain-damaged chip but now think it must be the rotary encoder. According to my Cirkit catalogue, the Alps low-cost mechanical encoder has a service life of 10^6 cycles. They cost #8.95 in the UK if that is what is used in your radios. 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 amsoft@epix.net Thu Aug 10 15:33:50 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Subject: Re: Rotary encoders Date: 8 Aug 1995 17:43:24 GMT Organization: Hewlett-Packard Lines: 20 Message-ID: <4087ns$57e@hpscit.sc.hp.com> References: <4051b3$hf6@lyra.csx.cam.ac.uk> <807820357snz@lfheller.demon.co.uk> NNTP-Posting-Host: hpscrj.scd.hp.com Xref: grape.epix.net rec.radio.amateur.homebrew:8806 rec.radio.shortwave:56755 rec.radio.amateur.digital.misc:9942 sci.electronics:138817 In article <807820357snz@lfheller.demon.co.uk>, Leon Heller wrote: >In article <4051b3$hf6@lyra.csx.cam.ac.uk> > andrew@pmms.cam.ac.uk "Andrew Thomason" writes: > >> Do rotary encoders "go off" after a year or so? Can they be repaired? Do they >> lose >> their magnetism or is it just dust which gets inside? >> >> I have a couple of digital radios which can be tuned by a knob, one cheap, one >> expensive. In both cases, after a year's use, the frequency started to dither >> around slightly whilst I smoothly turned the knob. I had thought this was due >> to a brain-damaged chip but now think it must be the rotary encoder. Yes, rotary encoders are infamous for their poor reliability. I don't know what makes them fail, I just know I have seen them go out time and time again. Rick Karlquist rkarlqu@scd.hp.com From amsoft@epix.net Thu Aug 10 15:33:51 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!Dortmund.Germany.EU.net!konech.kontron.de!sun4a!tom From: tom@kontron.de (Thomas de Lellis) Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Subject: Re: Rotary encoders Followup-To: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Date: 9 Aug 1995 08:45:12 GMT Organization: Kontron Elektronik GmbH Lines: 29 Distribution: world Message-ID: <409sio$3id@Kontron.De> References: <4051b3$hf6@lyra.csx.cam.ac.uk> NNTP-Posting-Host: sun4a.kontron.de X-Newsreader: TIN [version 1.2 PL2] Xref: grape.epix.net rec.radio.amateur.homebrew:8821 rec.radio.shortwave:56787 rec.radio.amateur.digital.misc:9946 sci.electronics:138910 Andrew Thomason (andrew@pmms.cam.ac.uk) wrote: : Do rotary encoders "go off" after a year or so? Can they be repaired? Do they lose : their magnetism or is it just dust which gets inside? : I have a couple of digital radios which can be tuned by a knob, one cheap, one : expensive. In both cases, after a year's use, the frequency started to dither : around slightly whilst I smoothly turned the knob. I had thought this was due : to a brain-damaged chip but now think it must be the rotary encoder. : Many thanks, : Andrew Thomason (andrew@dpmms.cam.ac.uk) Hi there, yes, same thing happened with my Kenwood R-5000 which used an optical rotary encoder. After talking with a local Kenwood dealer here in Munich, that was disinterested in taking the radio for service, I decided to have a go at it myself and tracked the problem down to a bad photodetector in the encoder itself. I was able to replace the detector with a detector removed from an emitter/detector module of the write protect section of a junked TEAC floppydrive. I was lucky it also fit mechancally in the R-5000 encoder. My R-5000's tuning knob has worked perfectly ever since. tom -- ________________ Thomas de Lellis KN6EI/DL5MGZ From amsoft@epix.net Thu Aug 10 15:33:52 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!btnet!bt!wally.srd.bt.co.uk!not-for-mail From: ponion@wally.srd.bt.co.uk (Peter Onion) Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Subject: Re: Rotary encoders Date: 9 Aug 1995 14:04:21 GMT Organization: BT Labs, Martlesham Heath, Ipswich, UK Lines: 22 Distribution: world Message-ID: <40af95$8lo@pheidippides.axion.bt.co.uk> References: <4051b3$hf6@lyra.csx.cam.ac.uk> <409sio$3id@Kontron.De> NNTP-Posting-Host: wally.srd.bt.co.uk Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Newsreader: TIN [UNIX 1.3 941216BETA PL0] Xref: grape.epix.net rec.radio.amateur.homebrew:8829 rec.radio.shortwave:56801 rec.radio.amateur.digital.misc:9949 sci.electronics:138949 Thomas de Lellis (tom@kontron.de) wrote: : Andrew Thomason (andrew@pmms.cam.ac.uk) wrote: : : Do rotary encoders "go off" after a year or so? Can they be repaired? Do they lose : : their magnetism or is it just dust which gets inside? : : I have a couple of digital radios which can be tuned by a knob, one cheap, one : : expensive. In both cases, after a year's use, the frequency started to dither : : around slightly whilst I smoothly turned the knob. I had thought this was due : : to a brain-damaged chip but now think it must be the rotary encoder. : : Many thanks, : : Andrew Thomason (andrew@dpmms.cam.ac.uk) Hi, I have a FT290 MkI that will only qsy HF, no matter which way you turn the knob! So I think I too have a faulty encoder! Anybody else had this problem? Peter Onion. G0DZB ponion@srd.bt.co.uk From amsoft@epix.net Thu Aug 10 15:33:53 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!crcnis3.unl.edu!unlinfo.unl.edu!mcduffie From: mcduffie@unlinfo.unl.edu (Gary McDuffie Sr) Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Subject: Re: Rotary encoders Date: 9 Aug 1995 15:23:49 GMT Organization: University of Nebraska--Lincoln Lines: 20 Distribution: world Message-ID: <40aju5$kde@crcnis3.unl.edu> References: <4051b3$hf6@lyra.csx.cam.ac.uk> <807820357snz@lfheller.demon.co.uk> <4087ns$57e@hpscit.sc.hp.com> NNTP-Posting-Host: unlinfo.unl.edu Xref: grape.epix.net rec.radio.amateur.homebrew:8834 rec.radio.shortwave:56807 rec.radio.amateur.digital.misc:9951 sci.electronics:138960 rkarlqu@scd.hp.com (Richard Karlquist) writes in a followup: >Yes, rotary encoders are infamous for their poor reliability. I don't >know what makes them fail, I just know I have seen them go out time and >time again. I'm assuming :) you are talking about light coupled encoders. I would have to say that I disagree with the statement that they are not reliable. Some of the most expensive equipment in the world uses them and they work without fail as long as they are kept clean and properly aligned. If designed properly, they won't need alignment, but dust gets on the encoder wheel and the source/target leds and causes problems. Carefully cleaning an encoder wheel will keep it working for many many years. Case in point, check out the FT-2400. It is notorious for encoder wheel problems. The one they replace it with, I've been told, is better sealed so that dust can't get to it as easily. Gary - AG0N From amsoft@epix.net Thu Aug 10 15:33:54 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Subject: Re: Rotary encoders Date: 9 Aug 1995 16:41:11 GMT Organization: Hewlett-Packard Lines: 21 Message-ID: <40aof7$ltd@hpscit.sc.hp.com> References: <4051b3$hf6@lyra.csx.cam.ac.uk> <807820357snz@lfheller.demon.co.uk> <4087ns$57e@hpscit.sc.hp.com> <40aju5$kde@crcnis3.unl.edu> NNTP-Posting-Host: hpscrj.scd.hp.com Xref: grape.epix.net rec.radio.amateur.homebrew:8839 rec.radio.shortwave:56816 rec.radio.amateur.digital.misc:9955 sci.electronics:138979 In article <40aju5$kde@crcnis3.unl.edu>, Gary McDuffie Sr wrote: >rkarlqu@scd.hp.com (Richard Karlquist) writes in a followup: > > >>Yes, rotary encoders are infamous for their poor reliability. I don't >>know what makes them fail, I just know I have seen them go out time and >>time again. > >I'm assuming :) you are talking about light coupled encoders. I would >have to say that I disagree with the statement that they are not >reliable. Some of the most expensive equipment in the world uses >them and they work without fail as long as they are kept clean and >properly aligned. If designed properly, they won't need alignment, Speaking of expensive equipment, the $58,000 HP 8663A is a case in point. The rotary encoder in that instrument has a relatively high failure rate. I don't know if the failed ones can be rehabilitated by cleaning out the dust. Rick Karlquist From amsoft@epix.net Thu Aug 10 15:33:55 1995 Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Rotary encoders Message-ID: <1995Aug9.155141.28943@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4051b3$hf6@lyra.csx.cam.ac.uk> <807820357snz@lfheller.demon.co.uk> <4087ns$57e@hpscit.sc.hp.com> Date: Wed, 9 Aug 1995 15:51:41 GMT Lines: 34 Xref: grape.epix.net rec.radio.amateur.homebrew:8840 rec.radio.shortwave:56817 rec.radio.amateur.digital.misc:9956 sci.electronics:138983 In article <4087ns$57e@hpscit.sc.hp.com> rkarlqu@scd.hp.com (Richard Karlquist) writes: >In article <807820357snz@lfheller.demon.co.uk>, >Leon Heller wrote: >>In article <4051b3$hf6@lyra.csx.cam.ac.uk> >> andrew@pmms.cam.ac.uk "Andrew Thomason" writes: >> >>> Do rotary encoders "go off" after a year or so? Can they be repaired? Do they >>> lose >>> their magnetism or is it just dust which gets inside? >>> >>> I have a couple of digital radios which can be tuned by a knob, one cheap, one >>> expensive. In both cases, after a year's use, the frequency started to dither >>> around slightly whilst I smoothly turned the knob. I had thought this was due >>> to a brain-damaged chip but now think it must be the rotary encoder. > >Yes, rotary encoders are infamous for their poor reliability. I don't >know what makes them fail, I just know I have seen them go out time and >time again. Actually, optical shaft encoders are noted for their extreme reliability and long life. About the only things that can harm them is contamination of the optical surfaces, an electrical surge that blows the LEDs or phototransistors, or shaft bearing failure. Now unfortunately, some of the shaft encoders used in amateur equipment are mechanical rather than optical, and tarnished contacts, and ordinary contact wear, take a rapid toll. 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 amsoft@epix.net Thu Aug 10 15:33:56 1995 Newsgroups: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!sdd.hp.com!hppwd!hplb!hpwin055.uksr!hpqmoea!dstock From: dstock@hpqmdla.sqf.hp.com (David Stockton) Subject: Re: Rotary encoders Sender: news@hpqmoea.sqf.hp.com (SQF News Admin) Message-ID: Date: Thu, 10 Aug 1995 07:51:37 GMT References: <40aof7$ltd@hpscit.sc.hp.com> Nntp-Posting-Host: hpqmocc.sqf.hp.com Organization: Hewlett-Packard LTD, South Queensferry, Scotland X-Newsreader: TIN [version 1.1 PL8.8] Followup-To: rec.radio.amateur.homebrew,rec.radio.shortwave,rec.radio.amateur.digital.misc,uk.radio.amateur,sci.electronics Lines: 26 Xref: grape.epix.net rec.radio.amateur.homebrew:8858 rec.radio.shortwave:56843 rec.radio.amateur.digital.misc:9968 sci.electronics:139087 Richard Karlquist (rkarlqu@scd.hp.com) wrote: : Speaking of expensive equipment, the $58,000 HP 8663A is a case in : point. The rotary encoder in that instrument has a relatively high : failure rate. I don't know if the failed ones can be rehabilitated : by cleaning out the dust. : Rick Karlquist The original RPG in that generation and earlier actually used a filament bulb as the light source, I think it was only in the mid 80's that things switched over to LED based rotary pulse generators. I'd moved into prod eng for a few years around that time and had to change everything in production at Queensferry over to the new type. I had a different problem with one... I wore out the shaft and bush in a prototype instrument doing testing (Spurious hunting) I swear one of my fingers is worn down, too. For the gross-overkill-global- domination class transceiver I keep building bits of, I think I may have to make my own RPG with proper ball races... The mechanical switch things are definitely bad news. Incidentally, how many people know that genuine Microsoft mice use nasty contact type pulse generators? I keep wearing them out playing Doom. Cheers David GM4ZNX From amsoft@epix.net Thu Aug 10 15:33:57 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!cs.umd.edu!zombie.ncsc.mil!news.gmi.edu!usenet.eel.ufl.edu!newsfeed.internetmci.com!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: mikedom@aol.com (MikeDom) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.equipment Subject: Re: ROTOR - Channel master - old tv salvage Date: 9 Aug 1995 00:45:08 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 7 Sender: root@newsbf02.news.aol.com Message-ID: <409egk$sbn@newsbf02.news.aol.com> References: <3vonnm$3ho@koala.uwec.edu> Reply-To: mikedom@aol.com (MikeDom) NNTP-Posting-Host: newsbf02.mail.aol.com Xref: grape.epix.net rec.radio.amateur.antenna:12681 rec.radio.amateur.homebrew:8816 rec.radio.amateur.misc:84560 rec.radio.amateur.equipment:15580 Hi Dan, You have an old channel master rotor, and all of the 3 wire rotors were basically the same. A new control box will run you old motor. I believe its something like 20 volts AC to run the thing if you want to make your own control. We just used one of those beasts this last field day....but we had a 12V DC motor installed in it ( we were QRP Battery) it worked quite well. 73 mike From amsoft@epix.net Thu Aug 10 15:33:57 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!alfa02.medio.net!guysmiley.blarg.com!eskimo!novatech From: novatech@eskimo.com (Steven Swift) Subject: Re: Schematic Draw Program Recommendations? X-Nntp-Posting-Host: eskimo.com Message-ID: Sender: usenet@eskimo.com (News User Id) Organization: Eskimo North (206) For-Ever X-Newsreader: NN version 6.5.0 CURRENT BETA (06/24/1995) #4 References: <3vsrso$m7a@ixnews3.ix.netcom.com> <4042u1$2a2@cc.iu.net> <1995Aug7.155511.19151@ke4zv.atl.ga.us> Date: Tue, 8 Aug 1995 14:29:10 GMT Lines: 21 gary@ke4zv.atl.ga.us (Gary Coffman) writes: >An ideal setup is Orcad as a frontend for Pcad. *Now* you're talking >bucks, but it automates almost all of the tedium of translating an >idea to a schematic and circuit board layout. I use Orcad with Eagle 3.0. This combo is excellent and very easy to use. It handles just about any type of board from simple to complex surface mount. Eagle (CadSoft) also has a schematic module, but I haven't used it. >Gary >-- >Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary >Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary >534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us >Lawrenceville, GA 30244 | | -- Steven D. Swift, P.E. ( novatech@eskimo.com ) NOVATECH INSTRUMENTS, INC. 1530 Eastlake Avenue East, Suite 303 206.322.1562, FAX 206.328.6904 Seattle, Washington 98102 USA From amsoft@epix.net Thu Aug 10 15:33:58 1995 Path: grape.epix.net!news.sprintlink.net!news.gate.net!sysop From: lslewis@gate.net (Larry Lewis) Newsgroups: rec.radio.amateur.homebrew Subject: SCR Help Date: Tue, 08 Aug 1995 11:23:40 GMT Lines: 6 Message-ID: <407h9e$i04@news.gate.net> NNTP-Posting-Host: @ftmfl-14.gate.net X-Newsreader: Forte Free Agent 1.0.82 I can't find the basing diagram for a C122B, TO-220 case, 8A 200V SCR. Any help, hint or just point me in the right direction would be appreciated. Larry KN6WC E-Mail: lslewis@gate.net From amsoft@epix.net Thu Aug 10 15:33:59 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!EU.net!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!enews.sgi.com!wdl1.wdl.loral.com!enterprise!pax!jeffa From: jeffa@pax.ssd.loral.com (Jeff Albom) Subject: Re: stainless/titanium wire source Message-ID: <1995Aug7.210838.22833@ssd.loral.com> Sender: jeffa@pax (Jeff Albom) Organization: Space Systems Loral References: <4059su$mtf@morrow.stanford.edu> <405euj$mas@hg.oro.net> Date: Mon, 7 Aug 1995 21:08:38 GMT Lines: 7 Go to Orchard Supply Hardware and you can buy spools of stainless steel wire. *************************************************************************** **What appears to be a sloppy or meaningless use of words may well be a ** **completely correct use of words to express sloppy or meaningless ideas.** *************************************************************************** jeffa@sesinc.com From amsoft@epix.net Thu Aug 10 15:34:00 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!hookup!bloom-beacon.mit.edu!news.moneng.mei.com!news.ecn.bgu.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: dcadd@luc.ac.BE (Duncan Cadd) Newsgroups: rec.radio.amateur.homebrew Subject: Titanium wire etc Date: 9 Aug 95 09:09:36 GMT Organization: ucsd usenet gateway Lines: 52 Message-ID: <9508090909.AA18344@alpha.luc.ac.be> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Greetings from a warm and sunny Diepenbeek in N.E. Belgium! Stephen Parry asked about supplies of titanium wire. One possibility is Aldrich Chemical Company, 1001 W. St. Paul Avenue, Milwaukee, Wisconsin 53233 tel 414 273 3850 fax 414 273 4979. They also have stuff like tungsten, zirconium, molybdenum, nickel etc etc wire, foil and what-have-you. Prices will be high-ish as they are suppliers of research grade chemicals, rather than work-a-day ironmongery, examples: THESE PRICES ARE IN BELGIAN FRANKS!! sorry, but that's life! (and what did you expect from Belgium!?) titanium wire: cat no. 34,886-4 99.99% pure 0.5mm diam 450milligrams (50cm long) BF 1824 2.7 grams (300cm) BF 6400 26,790-2 99.7% pure 0.81mm diam 23grams (10 metres long) BF 1623 115grams (50 metres) BF 5544 Stuff like titanium, zirconium, tantalum and a whole pile of other metals can be used as 'getters' (which someone asked about a few days back) in tubes. Sorry folks, but I don't know if they will sell in small quantities to 'the public' but you can always ask, and I'm sure they will offer advice as to where you can try once you explain your intentions - I hope this helps. If you are looking for general advice on vacuum systems etc, I'd suggest "Building Scientific Apparatus - A Practical Guide to Design and Construction" by John H. Moore, Christopher C. Davis and Michael A. Coplan, published by Addison Wesley, the old edition which I have is 1983, ISBN 0-201-05532-5, but there's a newer one, also in soft cover (the hardback was EXPENSIVE! 62 UK pounds in '88 or so) - maybe the local library could get it for you. It lists many US suppliers, but again, it's research oriented so many will be pricey and may not be interested in 'small' sales. But you can always try . . . 73, Duncan ON9CHU / G0UTY G-QRP 8117 IMO/SBG, Afdeling Organische Scheikunde, Gebouw D, Limburgs Universitair Centrum, B-3590 Diepenbeek, Belgium From amsoft@epix.net Thu Aug 10 15:34:00 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!newsjunkie.ans.net!butch!news From: adercole@mezzrtm.lasc.lockheed.com (Anthony D'Ercole) Newsgroups: rec.radio.amateur.homebrew Subject: TS-440 RS232 command set Date: 9 Aug 1995 13:01:08 GMT Organization: Lockheed Aeronautical Systems Company Lines: 10 Message-ID: <40abik$eat@butch.lmsc.lockheed.com> Reply-To: adercole@mezzrtm.lasc.lockheed.com NNTP-Posting-Host: rtm13.lasc.lockheed.com I would like to interface my personal commputer to my TS-440 RS232 serial port. Does anyone know where I can get my hands on the Command Set for the Radio. The format of the commands on the responses back. (i.e. the Software ICD) From amsoft@epix.net Thu Aug 10 15:34:01 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: jonathan.ho@Xilinx.COM (Jonathan Ho) Newsgroups: rec.radio.amateur.homebrew Subject: unsubscribe Date: 7 Aug 95 20:59:48 GMT Organization: ucsd usenet gateway Lines: 1 Message-ID: <199508072059.NAA16682@clemenza.xilinx.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu unsubscribe From amsoft@epix.net Thu Aug 10 15:34:02 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!not-for-mail From: pglibber@uk.oracle.com (Peter Glibbery) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: US Military Field Expedient Antennas Date: 9 Aug 1995 04:25:19 -0500 Organization: UTexas Mail-to-News Gateway Lines: 42 Sender: nobody@cs.utexas.edu Message-ID: <9508090927.AA22216@ukpyr2.uk.oracle.com> NNTP-Posting-Host: news.cs.utexas.edu Xref: grape.epix.net rec.radio.amateur.antenna:12685 rec.radio.amateur.homebrew:8820 rec.radio.amateur.misc:84567 I have some fairly basic questions that I would appreciate your help and guidance with. I have been reading a US Army Special Forces manual which discusses various types of improvised, field-expedient antennas such as: Ground Plane Horizontal Long-wire Half-Rhombic Doublet I'm writing from the UK and the references mentioned in the manual are not at all easy to come by - I've tried. 1) In the case of some of these designs there is a need for a 'ground'. The diagrams in the manual show one end of a wire attached to a metal stake which is pushed into the ground, while the other end is attached to the radio set itself. Where on the radio set is the free end of the ground wire attached ? Is it attached to some kind of socket, or do you somehow attach it to the body of the radio set ? 2) When using a 1/2-Rhombic the manual mentions that you feed the two 1/4 wave antenna elements from the centre using a 'coax'. What exactly is a 'coax' and how does it differ from the antenna wire itself ? 3) With the 1/2-Rhombic design the manual suggests that if a coax is not available to use a 'twisted pair'. What is a twisted pair ? My guess is two sheathed copper wires twisted together - but is this too simple a thought ? 4) With the 1/2-Rhombic one end of the antenna wire is attached to a terminating resistor. The idea of this resistor is to give some directionality to the radio wave (I recognise that there is a difference between a resistor and an insulator (in the later case, the manual suggests a piece of wood or a C-ration spoon)). Does anyone have a good idea of what would make a good field expedient resistor ? Thanks, Peter From amsoft@epix.net Thu Aug 10 15:34:02 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!emory!nntp.msstate.edu!Nntp.wes.army.mil!usenet From: butch@apollo.wes.army.mil (Butch Magee) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Re: US Military Field Expedient Antennas Date: 9 Aug 1995 14:02:44 GMT Organization: USACE WES ITL Lines: 6 Message-ID: <40af64$hi3@prop.wes.army.mil> References: <9508090927.AA22216@ukpyr2.uk.oracle.com> NNTP-Posting-Host: 134.164.80.37 X-Newsreader: WinVN 0.92.1 Xref: grape.epix.net rec.radio.amateur.antenna:12698 rec.radio.amateur.homebrew:8837 rec.radio.amateur.misc:84595 In article <9508090927.AA22216@ukpyr2.uk.oracle.com>, pglibber@uk.oracle.com (Peter Glibbery) says: > >You'r kidding us, right Peter? Playing a little "see who will respond" game? Ok! you got one, me. Butch From amsoft@epix.net Thu Aug 10 15:34:03 1995 Path: grape.epix.net!news.sprintlink.net!ionews.ionet.net!usenet From: martvin@ionet.net (Martin T. Vinson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Want to build a power supply Date: 10 Aug 1995 05:46:57 GMT Organization: Internet Oklahoma Lines: 24 Message-ID: <40c6gh$9n5@ionews.ionet.net> References: NNTP-Posting-Host: osip18.ionet.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 In article , by668@FreeNet.Carleton.CA says... > > > >Hello, > >I want to build a 13.5 Vdc 20 Amp. >I need someone to draw up the schematics and list of pieces, >I know some of you will say that it would cost less to buy one >but I already have many pieces that can probably be used, >so if there's a genius in that field around, i'd love to hear >from them... > > >Thanks many times... > >Marc Not to dampen your creative spirit, but take it from one who has built many, many (many) power supplies, etc.....by the time you can buy all of the parts (including a cabinet to put it in) you can pay for a very nice Astron power supply....have fun. KN6UG From amsoft@epix.net Mon Aug 14 21:09:33 1995 Newsgroups: rec.radio.amateur.homebrew Subject: $$$ Use The Internet To M From: clint.bradford@woodybbs.com (Clint Bradford) Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!usc!cs.utexas.edu!news.sprintlink.net!holonet!colossus.holonet.net!wwswinc!clint.bradford Distribution: world Message-ID: <93.1291.7584.0NFBAD4A@woodybbs.com> Date: Fri, 11 Aug 95 11:56:00 -0500 Organization: WoodyWare Software, Inc. - 516-736-6662 Lines: 5 Subject: $$$ Use The Internet To Make Ca$h!! $$$ Are ALL Prodigy Users this ignorant? --- þ wcECHO 4.1 ÷ AR-Net: ATTENTION to Details þ Mira Loma, CA þ 909-681-6221 From amsoft@epix.net Mon Aug 14 21:09:34 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsjunkie.ans.net!swiss.ans.net!elron2.elron.net!usenet From: ernie@netvision.net.il (Tsachy Lindenbaum) Newsgroups: rec.radio.amateur.homebrew Subject: 432 Mhz pre-amp Date: 13 Aug 1995 21:14:50 GMT Organization: Your Organization Lines: 13 Message-ID: <40lq0b$2fe@elron2.elron.net> NNTP-Posting-Host: ts92p11.netvision.net.il Mime-Version: 1.0 X-Newsreader: WinVN 0.99.4 -- Good bye from: Hi I'm looking for a reliable design to be mast-mounted. It should do 0.5 DB N.F & appx 18 DB gain. Any ideas ? Kits are welcome too !!! Thank you in advance & best regards Tsachy Lindenbaum, P.O.B 21224 Tel-Aviv 62195, Israel 4Z4TL @ 4Z4AAA.ISR.MDLE 972-9-582959 From amsoft@epix.net Mon Aug 14 21:09:34 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews From: kkoelman@ix.netcom.com (Koert Koelman ) Newsgroups: rec.radio.amateur.homebrew Subject: Auction in N. Calif. Date: 13 Aug 1995 05:39:25 GMT Organization: Netcom Lines: 9 Message-ID: <40k36d$b3c@ixnews7.ix.netcom.com> NNTP-Posting-Host: ix-pa9-16.ix.netcom.com The annual Amateur Radio Auction by the Palo Alto Amateur Radio Association (PAARA), a non-profit orgabization, will be held in the Ampex cafeteria at 401 Broadway, Redwood City, CA on Saturday, October 7, 1995. Doors will open around 7:30 a.m. Further details will follow within a week. However, already mark this date on your calendars so that you will not miss this exciting event. 73/Koert KC6WCI From amsoft@epix.net Mon Aug 14 21:09:35 1995 Path: grape.epix.net!news.sprintlink.net!gatech!howland.reston.ans.net!ix.netcom.com!netnews From: ultravis@ix.netcom.com (Guy Scott ) Newsgroups: rec.radio.amateur.homebrew Subject: Calibration of Freq.Counter Date: 12 Aug 1995 11:56:28 GMT Organization: Netcom Lines: 9 Message-ID: <40i4tc$4v2@ixnews5.ix.netcom.com> NNTP-Posting-Host: ix-wpb-fl1-02.ix.netcom.com Hi all, just had a question on calibrating a freq. counter thats been kicking me for a while. Ive heard of using wwv broadcasts for calibration but was comepletly lost to exactly how this was accomplised. Also if this calibration can be done with a home made IE: inexpensive freq. standard in the shack? All info. is welcome! Thanks, Henry (Ke4wbw) From amsoft@epix.net Mon Aug 14 21:09:36 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Calibration of Freq.Counter Date: Sat, 12 Aug 95 15:31:01 GMT Organization: TSE Systems Lines: 43 Message-ID: <40ihhd$hk1@solaris.cc.vt.edu> References: <40i4tc$4v2@ixnews5.ix.netcom.com> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 In article <40i4tc$4v2@ixnews5.ix.netcom.com>, ultravis@ix.netcom.com (Guy Scott ) wrote: > > Hi all, just had a question on calibrating a freq. counter thats >been kicking me for a while. > Ive heard of using wwv broadcasts for calibration but was >comepletly lost to exactly how this was accomplised. Also if this >calibration can be done with a home made IE: inexpensive freq. standard >in the shack? To calibrate to WWV, you zero-beat the frequency counter's reference signal (usually 10 MHz) to the WWV carrier. While listening to WWV on 10.000 MHz, switch on the frequency counter and listen for the beat frequency (Let the counter warm up for a half hour or so before adjusting though). Most cheap counters will leak plenty of signal out that it will couple into the receiver antenna. More deluxe ones usually have a "10 MHz out" or such BNC on the back to which you could connect a piece of wire to serve as an antenna. It takes a bit of time to be sure you really have zero beat, when you are close it will sound like the signal strength of WWV is rising and falling periodically. This works fairly well, certainly for a quick setup of a counter that isn't going to be very stable anyway. An advanced method I have heard of, but not tried, is to modify a Loran-C receiver to bring out a signal synchronized to the received signal timing. The Loran transmitters are controlled by accurate atomic clocks as well, and being ground wave there is less variation due to the atmosphere. Use a 2-channel scope to compare the average phase drift of the oscillator you're calibrating over the Loran pulse, or simply count the GRI frequency (usually 100-200 Hz). A counter which does "period average" measurements would resolve this low frequency better. A similar technique may exist using GPS as well. Signals derived from TV broadcasts, once regarded as very precise, are now only moderately precise because the TV stations may resynchronize everything to their local crystal oscillator. This is still better than nothing, and can often be done with no equipment by using a wire or loop "antenna" to pick up and count the horizontal-rate pulses (15.734265 KHz, *not* 15.750 KHz any more) radiated by a TV tuned to a stable broadcast signal. -Mike KD4QDM From amsoft@epix.net Mon Aug 14 21:09:37 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Calibration of Freq.Counter Date: Sat, 12 Aug 95 16:38:57 GMT Lines: 29 Message-ID: <808246331.20955@pinetree.microserve.com> References: <40i4tc$4v2@ixnews5.ix.netcom.com> <40ihhd$hk1@solaris.cc.vt.edu> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 In article <40ihhd$hk1@solaris.cc.vt.edu>, > >A similar technique may exist using GPS as well. In the MMDS industry, we often have a need to lock adjacent transmitting sites that are fifty miles or less apart to a common reference. By locking the L.O.'s of the TV transmitters and modulators to a common source, we can greatly reduce the visible effects of co-channel interference. GPS is gaining widespread popularity for this use. When everything is working correctly, there is no actual frequency difference between two (or more) transmit sites, only a phase shift. GPS receivers used for this purpose include a disciplined 10 MHz VCXO that is updated periodically by the GPS signals. The quality of the disciplined oscillator ultimately has a lot to do with the quality and stability of the 10 MHz output, because the receiver's control pulses only serve to "fine tune" it. If a custom GPS-locked reference was used directly to drive the counter, it would virtually eliminate the need to ever align it. Cost for these units is still outside the range of the typical homebrew workshop, but prices *are* falling. 73, Jack WB3U From amsoft@epix.net Mon Aug 14 21:09:38 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!prairienet.org!w9sz From: w9sz@prairienet.org (Zack Widup) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Calibration of Freq.Counter Date: 12 Aug 1995 18:19:29 GMT Organization: University of Illinois at Urbana Lines: 23 Message-ID: <40irbh$gbc@vixen.cso.uiuc.edu> References: <40i4tc$4v2@ixnews5.ix.netcom.com> Reply-To: w9sz@prairienet.org (Zack Widup) NNTP-Posting-Host: firefly.prairienet.org In a previous article, ultravis@ix.netcom.com (Guy Scott) says: > > Hi all, just had a question on calibrating a freq. counter thats >been kicking me for a while. > Ive heard of using wwv broadcasts for calibration but was >comepletly lost to exactly how this was accomplised. Also if this >calibration can be done with a home made IE: inexpensive freq. standard >in the shack? > All info. is welcome! > Thanks, Henry (Ke4wbw) > I have a freq counter that uses an oddball xtal (3.9 something-or-other MHz.) What I have is a 10-MHz crystal-oven oscillator and a 100 MHz oscillator phaselocked to it which will eventually be the base for a 10 GHz SSB transverter (See Glenn Elmore N6GN articles in Ham Radio.) The 10 MHz ocsillator is zeroed with WWV. I use the 100 MHz output to calibrate the freq counter every once in a while. Makes it a little more accurate than with the 10 MHz signal. 73, Zack W9SZ From amsoft@epix.net Mon Aug 14 21:09:38 1995 Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Calibration of Freq.Counter Date: Sat, 12 Aug 95 19:07:31 GMT Lines: 14 Message-ID: <808255249.23046@pinetree.microserve.com> References: <40i4tc$4v2@ixnews5.ix.netcom.com> <40irbh$gbc@vixen.cso.uiuc.edu> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 In article <40irbh$gbc@vixen.cso.uiuc.edu>, w9sz@prairienet.org (Zack Widup) wrote: >What I have is a 10-MHz crystal-oven oscillator and a 100 MHz >oscillator phaselocked to it which will eventually be the base for a >10 GHz SSB transverter (See Glenn Elmore N6GN articles in Ham Radio.) Out of curiosity, is the 100 MHz oscillator a VCO or VCXO? Is phase noise a consideration in your design? 73, Jack WB3U From amsoft@epix.net Mon Aug 14 21:09:39 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Calibration of Freq.Counter Message-ID: <1995Aug13.152829.1630@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <40i4tc$4v2@ixnews5.ix.netcom.com> Date: Sun, 13 Aug 1995 15:28:29 GMT Lines: 35 In article <40i4tc$4v2@ixnews5.ix.netcom.com> ultravis@ix.netcom.com (Guy Scott ) writes: > > Hi all, just had a question on calibrating a freq. counter thats >been kicking me for a while. > Ive heard of using wwv broadcasts for calibration but was >comepletly lost to exactly how this was accomplised. Also if this >calibration can be done with a home made IE: inexpensive freq. standard >in the shack? There are two rather simple ways to calibrate a counter against WWV. First, if your counter reference oscillator's fundamental or harmonic falls on a WWV frequency, then you simply use a receiver to zero beat the reference to WWV. For example, if your counter uses a 10 MHz reference oscillator, you'd just filch a bit of that signal out of the counter and inject it into your receiver along with an antenna input for WWV. Put the receiver in AM mode, and adjust the reference oscillator for zero beat, a scope can help when you get down to a subaudible beat, or you can watch the S-meter's rise and fall. If your counter's timebase isn't a fundamental or harmonic of a WWV frequency, then you'll need a transfer oscillator. A 10 MHz crystal oscillator will do. Just zero beat it to WWV with the receiver as above, and while it's at zero beat, read its frequency with the counter. Adjust the counter's reference oscillator so that the counter displays exactly 10 MHz and you are done. Needless to say, the counter should be warmed up and stable before attempting this calibration. 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 amsoft@epix.net Mon Aug 14 21:09:41 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier From: mzenier@netcom.com (Mark Zenier) Subject: Re: Can Schems/Diags be Posted here? *.uue?? Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: 01HTV4REJL2A001045@uthscsa.edu> <40bd1d$4d5@nuclear.microserve.net> <40d8ap$dpj@unisql.unisql.com> <40dkoi$i4i@nuclear.microserve.net> Date: Fri, 11 Aug 1995 22:37:20 GMT Lines: 41 Sender: mzenier@netcom19.netcom.com in <40dkoi$i4i@nuclear.microserve.net>, WB3U wrote: : I understand that concept Jim, but I really think it's nit-pickin' to : apply it to this situation. If net-wide resources are really a : concern, one only has to take a peek at alt.binaries.pictures.erotica : and a.b.p.multimedia to realize that a few schematics aren't even a : drop in the bucket. : Schematics and other technical drawings would often be helpful and : relevant when discussing homebrew topics. Unless objections are based : on something other than general resources, I say go for it! Do not assume that the tools you use to read this apply to everyone. Anything posted to some groups gets transfered though channels that charge by volume. Either through people who subscribe to the email gateway list server and get charged for their email, or by sites that access a limited number of newsgroups and use the UUCP batching from an upstream site. These recipients have no option. They get no preview of the traffic. They end up paying, whether the posting is useful to them or not. They get really upset if someone dumps a whole lot of traffic on them. (The most recent case was someone posting a half a meg of cad package to sci.electronics. Flame city.) As for a schematic group in the big 7 (now 8) hierarchies, I proposed this for the reorganization of the sci.electronics hierarchy thats under discussion now. The word from the group-advice mailing list (who look out for the interests of all usenet, and more specifically the news administators) was that it would be considered a binaries group and should only be a moderated group in the comp.binaries hierarchy. Maybe you could convince them. I didn't want the hassle, so I took it out of the RFD proposal. Mark Zenier mzenier@eskimo.com mzenier@netcom.com "I've never been able to explain to people that the version of Seattle they have in their heads is not the Seattle I grew up in. I mean, if Seattle is Oz, I guess I was one of the flying monkeys." - Lynda Barry. From amsoft@epix.net Mon Aug 14 21:09:41 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can Schems/Diags be Posted here? *.uue?? Date: Sat, 12 Aug 95 19:15:56 GMT Lines: 19 Message-ID: <808255764.23046@pinetree.microserve.com> References: 01HTV4REJL2A001045@uthscsa.edu> <40bd1d$4d5@nuclear.microserve.net> <40d8ap$dpj@unisql.unisql.com> <40dkoi$i4i@nuclear.microserve.net> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 mzenier@netcom.com (Mark Zenier) wrote: >Anything posted to some groups gets transfered though channels that >charge by volume. >These recipients have no option. They get no preview of the traffic. >They end up paying, whether the posting is useful to them or not. Now that's a valid reason. Of course, it leads to the question of how to distribute a useful binary. I'm lucky enough to have a personal anon FTP area available through my service provider, but that's not always the case. Also, e-mail can be a real pain if too many folks want a copy. Any suggestions for a work-around, other than starting a new group? 73, Jack WB3U From amsoft@epix.net Mon Aug 14 21:09:42 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!newsspool.doit.wisc.edu!koala.uwec.edu!usenet From: dan drumm Newsgroups: rec.radio.amateur.homebrew Subject: Re: cross reference semiconductors. Date: 12 Aug 1995 17:56:03 GMT Organization: University of Wisconsin Eau Claire Lines: 44 Message-ID: <40ipvj$vt@koala.uwec.edu> References: <40g9p6$ev3@koala.uwec.edu> <40gn2o$qq4@news1.inlink.com> NNTP-Posting-Host: lilith.uwec.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; OSF1 V3.2 alpha) To: raiar@inlink.com X-URL: news:40gn2o$qq4@news1.inlink.com raiar@inlink.com (Gary V. Deutschmann, Sr.) wrote: >In article <40g9p6$ev3@koala.uwec.edu>, drumm says... >> >>here is a general and specific question. how do I cross reference >>transistors, chips, etc. I do not want to call up parts stores, because >>I have so much salvage laying around the house, that I could build a >>hundred projects, and still not make a dent. >> >>I have a NTE cross ref. program, but that only gives me NTE #'s. >> >>Is there anything more general I could use? >> >>Specifically, this time I was looking for a substitute for a TIP-120 >>I am sure it is a general purpose switching transistor, but it would >>have been nice to find some listed as a good cross. >> >>thanks for the ideas. >> >> >>-- Dan >>N9vox >> >>BTW: Am I the only one who can not stand to see good electronics >>thrown away? Why buy new what will last forever and is free? >> >Tip-120s are very common, the NTE number is the generic number for this >transistor, usually an ECG number would be the same number. ECGs number is >261. > >If you keep parts the way I do, I finally put every transistor in sorted >envelopes under the ECG number for that part. That way finding them is >easy. > >Gary OK, a very simple idea. That's the best kind! I guess I'll have to sit down for an afternoon and enter part numbers. I'll cross them all to NTE since I have that program handy. Thanks. -- Danny N9VOX From amsoft@epix.net Mon Aug 14 21:09:43 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!news.dra.com!news.starnet.net!wupost!news1.inlink.com!usenet From: raiar@inlink.com (Gary V. Deutschmann, Sr.) Newsgroups: rec.radio.amateur.homebrew Subject: Re: cross reference semiconductors. Date: 11 Aug 1995 22:54:16 GMT Organization: Inlink Lines: 34 Message-ID: <40gn2o$qq4@news1.inlink.com> References: <40g9p6$ev3@koala.uwec.edu> NNTP-Posting-Host: slip11.inlink.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 In article <40g9p6$ev3@koala.uwec.edu>, drumm says... > >here is a general and specific question. how do I cross reference >transistors, chips, etc. I do not want to call up parts stores, because >I have so much salvage laying around the house, that I could build a >hundred projects, and still not make a dent. > >I have a NTE cross ref. program, but that only gives me NTE #'s. > >Is there anything more general I could use? > >Specifically, this time I was looking for a substitute for a TIP-120 >I am sure it is a general purpose switching transistor, but it would >have been nice to find some listed as a good cross. > >thanks for the ideas. > > >-- Dan >N9vox > >BTW: Am I the only one who can not stand to see good electronics >thrown away? Why buy new what will last forever and is free? > Tip-120s are very common, the NTE number is the generic number for this transistor, usually an ECG number would be the same number. ECGs number is 261. If you keep parts the way I do, I finally put every transistor in sorted envelopes under the ECG number for that part. That way finding them is easy. Gary From amsoft@epix.net Mon Aug 14 21:09:45 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!hookup!news.uoregon.edu!news.bc.net!felix.junction.net!usenet From: Stewart Thompson Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Re: cross reference semiconductors. Date: 13 Aug 1995 04:50:49 GMT Organization: Okanagan Internet Junction, Vernon, B.C., Canada Lines: 35 Message-ID: <40k0b9$aa6@felix.junction.net> References: <40g9p6$ev3@koala.uwec.edu> NNTP-Posting-Host: vernon-02.junction.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: grape.epix.net rec.radio.amateur.homebrew:8955 rec.radio.amateur.misc:84901 dan drumm wrote: >here is a general and specific question. how do I cross reference >transistors, chips, etc. I do not want to call up parts stores, because >I have so much salvage laying around the house, that I could build a >hundred projects, and still not make a dent. > >I have a NTE cross ref. program, but that only gives me NTE #'s. > >Is there anything more general I could use? > >Specifically, this time I was looking for a substitute for a TIP-120 >I am sure it is a general purpose switching transistor, but it would >have been nice to find some listed as a good cross. > >thanks for the ideas. There are numerous cross reference guides. Try and get your hands on as many as you can. Other common ones are ECG, GE, RCA, and even Radio Shack. I never throw these away, new numbers are always being added or deleted. The way I figure out whether a part will work or not is by crossing the number I want to say the NTE number. I look this up and find out what the parameters are. (ie npn Ic Vbc etc.) Then I check my parts bin for likely suspects and cross them also. Usually I can find an exact match. Sometimes you can find a functionally equivelant part with a differnt pinout. If your stuck you can usully twist the leads around to work. Obviously that won't work with an IC but its amazing what a little ingenuity can do. Generic chips can often be swapped, but you have to watch the circuit in question. When it comes to specailty chips your probably out of luck. With transistors, there are dozens of numbers which have essentially the same characteristics. For instance a 2n2222, 2n4401, 2n3904 are common npn transistors which are essentially the same. bear in mind that modern silicon transistors are pretty stable. In a well designed circuit, just about any transistor that as adequate gain, voltage and current ratings for the circuit should work just fine in 90 plus per cent of the circuits you are likely to encounter. Well I hope this helps. Stu.....VE7BQy sthompsn@junction.net From amsoft@epix.net Mon Aug 14 21:09:45 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.mid.net!krypton.hpc.sdsmt.edu!ep68_cns.sdsmt.edu!jbeens From: jbeens@silver.sdsmt.edu Newsgroups: rec.radio.amateur.homebrew Subject: Frequency hopping Date: Mon, 14 Aug 1995 18:35:21 GMT Organization: South Dakota School Of Mines and Technology Lines: 11 Message-ID: NNTP-Posting-Host: ep68_cns.sdsmt.edu X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] Hello all! I am a senior in electrical engineering at the South Dakota School of Mines in Rapid City, SD. I am considering building a frequency hopping radio as my senior desing project. Is there a frequency band that I can legaly do this in? Thank you, 73's Jason Beens KB0CDN From amsoft@epix.net Mon Aug 14 21:09:47 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: hamrlund@aol.com (HAM R LUND) Newsgroups: rec.radio.amateur.homebrew Subject: FS: Parts, manuals, accessories, misc. Date: 13 Aug 1995 12:17:43 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 140 Sender: root@newsbf02.news.aol.com Message-ID: <40l8j7$8lk@newsbf02.news.aol.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader *********************************************************** *********************************************************** CONTACT: Robert Fowle .......Hamrlund@aol.com Ph. 517-789-6721................................................ 1215 Winifred....Jackson, Mich. 49202-1946 ----------->the Hammarlund guy ********************************************************** ********************************************************** The following is a list of items that may be of interest,,,,,,to you ? All pricing includes shipping.................. PARTS***************************************************** Of course Hammarlund, if you need something let me know...to much to list, NOT even Andrew wanted to take the list... : > ))) ****** air variables have the following for sale, capacity listed where known. most have no boxes, all are poly-bagged. will sell by the piece or trade all for Hammarlund equipment, manuals, accessories, literature, ect. If no price is listed...it is $10.00 each qty.- part# - capacity (if known) Hammarlund: 1/ 34604-5 1/ 34604-6 1/ 351-1059 1/ 4111-49 1/ 48A084 1/ 5003-C C1C 1/ 9404-18-00040 2/ 9411-72-50379 2/ 9411-72-60348 1/ 11727-77 1/ A8H501 1/ APC 25 3.0-25. 4/ ASP 100 G $13.00 ea 1/ APC 100 5.5-100 $13.00 ea 5/ APC 140 6.7-140 $13.00 ea 1/ B-253-124-2 1/ B-7485-440-2 1/ C 67380 3/ CT 1E040 5.0-40 1/ CT 1E075 6.0-75. 1/ CT 1F040 5.0-40. 1/ CT 3C040 1/ CT 14E042-M 5.0-42 1/ CT 14E042-J 3.0-10. 1/ CT 14F010-J 3.0-10. 1/ CT 14F042-J 5.0-42 1/ CT 1316047-J 5.5-47. 2/ ES 676693-5 2/ KS-13772 3/ KS-13998L1 1/ KS 18998L14 1/ MACBF-3 1.3-3.1 N.I.B. 1/ MAC-5 N.I.B. 1/ HF-15-X N.I.B. 1/ HF-50 N.I.B. 1/ MAC-20 2.0-21.5 2/ MABF-8 2.0-7.9 1/ MAPC-100 4.5-100. $13.00 1/ MCD-35 MX 6.0-31. $15.00 1/ MJ-50-5 1/ P-31800014 1/ P-7761345-15 1/ 34452-40 4/ 841690 1/ 7765659-1 $25.00 CARDWELL 2/ A-105623 25MuFD $18.00 ea 3/ ZU-100-AS 3.0-100. $15.00 ea B&W 1/ CX-62-C : This is the cap used with the KW plug-in coils $75.00 new no box BUD 1/ 1615 AIR GAP-300 75MMFD $65.00 new no box EFJ 1/ ? DUAL SECTION 14 3/4" L x 5.50" W 1/8" spacing (approx. measurments) $95.00 1/ 48c075 air gap .175 dual sec., 9.75" L x 4" W $65.00 1/ ? 5.75" L x 4" W single sec. 1/8 " spacing $55.00 1/ 4134MS4 edge wound 41 uh $75.00 ******* BOOKS & MANUALS ********************** HAMMARLUND MANUAL SALE ****************************** I have a limited number of new manuals i got when i purchased the inventory of Wayne Cordell..... These are unused originals. some may have a fade area on the cover from storage before I got them, yet others look almost as they did 35+ years ago. these are new unused and in unread condition. Here's whats available: HQ-100.........................$23.00 ea HQ-145-A......................$23.00 ea HXL ONE AMP..............$23.00 ea HX 50............................$23.00 ea HX-500..........................$23.00 ea Get them while they last. I have never made them available in such away before. This is a unique oppertunity...... SUPPLIES ARE LIMITED.....FIRST COME FIRST SERVE........... THE FOLLOWING WILL BE 'COPIES'. Prices are shipped. HAMMARLUND Comet Pro 2nd Edition 20.00 Comet Pro manual 3 AVCModel 20.00 Four 20 xmitter & four 11 modulator 20.00 RGB CHC 46140 / CHC 49154 20.00 HQ - 100 18.00 HQ-100A 18.00 HQ-105TR / TRS 18.00 HQ-110 18.00 HQ-110A 18.00 HQ-120X 18.00 HQ-129X From amsoft@epix.net Mon Aug 14 21:09:48 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in2.uu.net!news.compulink.com!abyss!lethe!gts!reptiles.org!westonia!humnet.humberc.on.ca!hduff Subject: FS: IC-551 FM board !!! Newsgroups: rec.radio.amateur.homebrew From: hduff@humnet.humberc.on.ca Date: Fri, 11 Aug 95 17:08:12 EST Message-ID: <7947-304583103@humnet.humberc.on.ca> Organization: HumberNet LSS Lines: 18 FS: I have an EX-106 optional FM board for the Icom IC-551 6 meter rig. I am aware that they as rare as hens teeth...accepting 'attractive' offers. Leave e-mail with offer to: hduff@humnet.humberc.on.ca --- þ NFX v1.3 [000] -- --------------------------------------------------------------------- HumberNet LSS (Learning Support System) - Humber College, Toronto "Tomorrow's communication and learning environment, today" Visit our Website at http://humnet.humberc.on.ca/ From amsoft@epix.net Mon Aug 14 21:09:49 1995 Path: grape.epix.net!news.sprintlink.net!ralph.vnet.net!news From: "Chris M. Bridges" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help! Source LM359 IC. Date: 12 Aug 1995 19:30:30 GMT Organization: Vnet Internet Access, Charlotte, NC - info@char.vnet.net Lines: 9 Message-ID: <40ivgm$qo1@ralph.vnet.net> References: <40eh1p$sn4@bluering.cowan.edu.au> <40fslf$2vp@nntp.Stanford.EDU> NNTP-Posting-Host: n4fan.vnet.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b4 (Windows; I; 16bit) To: stevem@w6yx.stanford.edu Are you looking for LM 358 or LM 359? you list both in you post. I have maybe 50 LM358's on hand if that is what you need. -- Chris M. Bridges >>>>>N4FAN<<<<<< n4fan@vnet.net From amsoft@epix.net Mon Aug 14 21:09:49 1995 Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: How to Space-Wind Coils? Date: Mon, 14 Aug 95 01:03:51 GMT Lines: 15 Message-ID: <808363044.19680@pinetree.microserve.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 The other day I was in a sporting goods store and noticed that monofilament line starts at a diameter of about 0.005" (2 lb test) and goes up in increments of about 0.002 or 0.003 from there. This is close to the size of many common wire gauges and I'm wondering if anyone has ever used fishing line to space-wind a coil? I know the diameter of different brands will vary, but is it reasonably consistent throughout the same spool? For my purpose, the exact spacing is less critical than the need for it to be consistent from one end of the finished coil to the other. Thanks & 73, Jack WB3U From amsoft@epix.net Mon Aug 14 21:09:50 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.deltanet.com!usenet From: mikek@deltanet.com (Mike) Newsgroups: rec.radio.amateur.homebrew Subject: HUMOR - 10 Commandments for Technicians Date: 14 Aug 1995 09:41:52 GMT Organization: Delta Internet Services, Anaheim, CA Lines: 84 Message-ID: <40n5p0$g9q@news1.deltanet.com> NNTP-Posting-Host: delta1.deltanet.com Mime-Version: 1.0 X-Newsreader: WinVN 0.93.11 10 COMMANDMENTS FOR TECHNICIANS _______________________________ I. BEWARE THE LIGHTNING THAT LURKETH IN THE UNDISCHARGED CAPACITOR, LEST IT CAUSE THEE TO BOUNCE UPON THY BUTTOCKS IN A MOST UNTECHNICIAN-LIKE MANNER. II. CAUSE THOU THE SWITCH THAT SUPPLIETH LARGE QUANTITIES OF JUICE TO BE ONPENED AND THUSLY TAGGED, THAT THY DAYS IN THIS EARTHLY VEIL OF TEARS MAY BE LONG. III. PROVE TO THYSELF THAT ALL CIRCUITS THAT RADIATH AND UPON WHICH THOU WORKETH ARE GROUNDED AND THUSLY TAGGED LEST THEY LIFT THEE TO RADIO FREQUENCY POTENTIAL AND CAUSETH THEE ALSO TO MAKE LIKE A RADIATOR. IV. TARRY NOT AMONGST THOSE FOOLS WHO ENGAGETH IN INTENTIONAL SHOCKS FOR THEY ARE SURELY NONBELIEVERS AND ARE NOT LONG FOR THIS WORLD. V. TAKE CARE THAT THOU USETH THE PROPER METHOD WHEN THOU TAKEST THE MEASURE OF A HIGH-VOLTAGE CIRCUIT LEST THOU INCINERATE BOTH THYSELF AND THY METER, FOR VERILY, THOUGH THOU HAST NO ACCOUNT NUMBER AND CAN EASILY BE SURVEYED, THE TEST METER DOTH HAVE ONE AND, AS A CONSEQUENCE, BRINGETH MUCH WOE UNTO THE SUPPLY DEPARTMENT. VI. TAKE CARE THAT THOU TAMPERETH NOT WITH SAFETY DEVICES AND INTERLOCKS, FOR THIS INCURETH THE WRATH OF THY SUPERVISOR AND BRINGETH THE FURY OF THY SAFTEY INSPECTOR UPON THY HEAD AND SHOULDERS. VII. WORK THOU NOT ON ENERGIZED EQUIPMENT, FOR IF THOU DOST, THY FELLOW WORKERS WILL SURELY BUY BEERS FOR THY WIDOW AND CONSOLER HER IN OTHER WAYS. VIII. SERVICE THOU NOT EQUIPMENT FOR ELECTRICAL COOKING. IT IS A SLOTHFUL PROCESS AND THOU MIGHT SIZZLE IN THINE OWN FAT FOR HOURS UPON A HOT CIRCUIT BEFORE THY MAKER SEE FIT TO END THY MISERY. IX. TRIFFLE THOU NOT WITH RADIOACTIVE TUBES AND SUBSTANCES LEST THOU COMMENCE TO GLOW IN THE DARK LIKE A LIGHTNING BUG AND THY WIFE HAVE NO FURTHER USE FOR THEE EXCEPT THY WAGES. X. THOU SHALT NOT MAKE UNAUTHORIZED MODIFICATIONS TO EQUIPMENT, BUT CAUSETH THOU TO BE RECOREDED ALL FIELD CHANGES AND AUTHORIZED MODIFICATION MADE BY THEE, LEST THY SUCCESSOR TEAR HIS HAIR AND GO SLOWLY MAD IN HIS ATTEMPT TO DECIDE WHAT MANNER OF CREATURE HATH MADE A NEST IN THE WIRING OF SUCH EQUIPMENT. From amsoft@epix.net Mon Aug 14 21:09:51 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!agate!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: IF transformers Date: 14 Aug 95 14:58:08 GMT Organization: ucsd usenet gateway Lines: 19 Message-ID: <9507148084.AA808416373@mails.imed.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Bob (K7NWB) was looking for 1500Khz to 1600 Khz IF transformers. Bob: You may have trouble finding the exact parts. (BTW back then they wer 1500 Kc transformers :>) ). The Heath HR 10 series of receivers used this frequency as the IF with a very broad 2 crystal half lattice. You could try to contact Heath and see if they still have any repair stock left. Another alternative if you don't care about exactly the right parts woulfd be to find an old NON-FUNCTIONAL BC454 or BC455 .(PLEASE, PLEASE, please don't destroy a perfectly good working piece of history). These radios also used an IF in that range. They also came with a variable BFO, a fact I learned when going through some 1960's era CQ magazines. Good luck with your project. It sounds like fun. Ray Mack WD5IFS mack@mails.imed.com From amsoft@epix.net Mon Aug 14 21:09:51 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.nic.surfnet.nl!news.sara.nl!news.pi.net!news From: William Vynck Newsgroups: rec.radio.amateur.homebrew Subject: KENWOOD IF-10D Interface WANTED Date: Sun, 13 Aug 95 15:25:56 EDT Organization: Planet Internet Lines: 9 Message-ID: NNTP-Posting-Host: bos90.pi.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage I'm looking for the schematics to build a Kenwood IF10D interface, to connect my Kenwood TS-50S to my computer. Also needs some good mod's for the TS-50. E-mail wvynck@pi.net From amsoft@epix.net Mon Aug 14 21:09:52 1995 Path: grape.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: ibmdelf@aol.com (IBM Del F) Newsgroups: rec.radio.amateur.homebrew Subject: Re: KENWOOD IF-10D Interface WANTED Date: 14 Aug 1995 00:30:36 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 51 Sender: root@newsbf02.news.aol.com Message-ID: <40mjhc$md2@newsbf02.news.aol.com> References: Reply-To: ibmdelf@aol.com (IBM Del F) NNTP-Posting-Host: newsbf02.mail.aol.com I built my own interface using just a MAX232 chip and four 10uF caps. However, before diving into this project I had read somewhere, and verified for myself after connecting the TS-50 to my computer, that several of the control features found in other Kenwoods are missing from the TS-50. The most serious omission is the capability to write a frequency to any of the memory channels. Any of the Kenwood control programs I've ever used would be crippled when used with this radio. All of the programs allow you to read and write frequencies to the memory channels in Kenwoods that support this. This would allow you to have several "pre-load" files with frequencies to program into your radio. For instance, if you have 100 freqs for SWBC, just load the file and the memories are reprogramed in seconds and you're set to go. Have another file for aero-traffic on the SW bands, etc. The TS-50 does not allow you to do this. I was very dissappointed when I confirmed the crippled nature of this radio. About the only way around this may be to write a program that provides "virtual memory channels" which you select from your computer screen and it will write each virtual memory channel frequency into the 'A' or 'B' VFO as you select different 'virtual memories' on the computer screen. A point of observation: I have the service manual for this unit and in the block diagram of the system, where a computer and RS232 interface connect to the 'digital board' in the radio there is a notation: "For factory and debug". That just about sums up Kenwood's reason for building it in. It certainly wasn't included for full remote-control usage by the owner. I guess Kenwood just couldn't imagine anyone wanting to connect a computer to a mobile unit. Don't you just love how the manufacturer looks out for you? On an up note: this radio is a fine piece of gear, particularly for mobile work. I've mounted it in the console right below the AM/FM/Tape factory radio and it blends well. I do miss a notch filter such as the one on my TS-440 though. I have made some mods to it including restoration of full spectrum transmit capability which for me serves two purposes: a test signal into a dummy load when aligning other gear including the TS-440 and for use on the CAP bands. If you would like a copy of the MAX232 schematic as it applies to the TS-50, drop me a note. Although I have drawn the schematic in .BMP format, I cannot upload it onto the Internet from my access point so I would have to mail the hardcopy to you. I also have one for the TS-440 if anyone is interested. The TLL signals of the two radios are NOT the same so if anyone was thinking of using the same one for both, forget it. You have to build an interface with a hex inverter added to the MAX232. Del, KD4B Raleigh, NC From amsoft@epix.net Mon Aug 14 21:09:53 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!uwm.edu!reuter.cse.ogi.edu!news.tek.com!usenet From: Antoon Milatz Newsgroups: rec.radio.amateur.homebrew Subject: keyer Date: 14 Aug 1995 10:54:21 GMT Organization: Tektronix, Inc, Beaverton, OR, USA Lines: 10 Message-ID: <40na0t$fks@goodnews.wv.tek.com> NNTP-Posting-Host: 192.158.203.165 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit) Where can I buy the *famous* CW keyer chip ? I believe it is mentioned in QST. I need the address and phone/fax number of this company. regards, Antoon PA3bwe (email: antoon.milatz@tek.com) From amsoft@epix.net Mon Aug 14 21:09:54 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!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: Re: Longwave Transmitter ['lowfer' band] Date: 11 Aug 1995 23:01:55 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 16 Sender: root@newsbf02.news.aol.com Message-ID: <40h5j3$7m6@newsbf02.news.aol.com> References: <402nb4$50q@solaris.cc.vt.edu> Reply-To: n1ddzrjc@aol.com (N1DDZ RJC) NNTP-Posting-Host: newsbf02.mail.aol.com There is a great book called the Low Frequency Radio Scrapbook by Ken Cornell that gives the details. Actually there are at least two editions, the earlier being tube oriented and the latter tube plus solid state. I think that the Ham Radio bookstore used to sell it and probably Uncle Wayne would have it. mkeitz@bev.net wrote: >>My recent poking around the Internet has let me to conclude that 1750 >meters >>is governed by Part 15: >> >>Sec. 15.217 Operation in the band 160-190 kHz. > Bob Crowley, Staff Inventor Input Devices, Wayland MA From amsoft@epix.net Mon Aug 14 21:09:55 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: dayj@ozemail.COM.AU (JOHN DAY) Newsgroups: rec.radio.amateur.homebrew Subject: Modulating VCO's Date: 12 Aug 95 00:57:15 GMT Organization: OzEmail Pty Ltd Lines: 55 Sender: JOHN DAY Message-ID: <1995AUG12.4436@ozemail.com.au> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu It seems that the comments in relation to the original posting have concentrated on 'other' methods of modulation, like using DSP's etc. Generally modulation of a VCO in an FM transmitter is done in one of two ways. But a quick bit of theory. The PLL uses a filter which is essentially a low pass filter which removes the high frequency noise and variations from the control voltage coming from the phase locked loop controller. The frequencies below the cutoff frequency of this filter are 'within the loop bandwidth'. And any frequency variations detected by the controller wihtin this frequency range will be eliminated. Every VCO has a 'modulation sensitivity' constant, which is usually expressed in MHz/volt, i.e. MHz of frequency change per volt change incontrol voltage. This value is not necessarilly constant, but can change over the frequency range of the VCO. If a voltage is added to the loop control voltage, simply by summing it resistively is a common practice, then this voltage will cause changes in the VCO frequency. If the modulating signal is outside the loop bandwidth then the mopdulation will appear at the output, if it is within the loop bandwidth then the PLL controller will remove it form the signal and it will NOT appear at the output. Hence the need for 'two point' modulation schemes. The output frequency of the PLL is directly related to the reference frequency of the loop. This is usually provided by a crystal which is divided down to a much lower value in the IC's. This crystal also establishes the stability and to a large extent the close in frequency domain performance of the loop. In order to modulate the loop at low frequencies, frequencies inside the loop bandwidth you modulate the reference crystal as well as the loop itself! The higher frequencies are passed to the VCO summing point and the lower frequencies to the crystal. The trick is simply this, you need to carefully design the filters and the level of modulation fed to each point to ensure that their is a smooth transition from the reference modulation to the loop modulation. This can be ab it of a trick! But all is not necessarilly lost, the need for a single signal to modulate two points is usually found only in high speed data radios, say for 9600bps packet operation. Many commercial radios are two point modulated, the speech or ordinary 1200/2400bps data is fed to the loop modulation point and the low frequency CTCSS or whatever is fed to the reference modulation point. Yell if you need any further help! 73 John Day VK3ZJF dayj@ozemail.com.au 100236,2364@Compuserve.com From amsoft@epix.net Mon Aug 14 21:09:55 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!news.uh.edu!uuneo.neosoft.com!scooter-slip-b2.NeoSoft.com!jedent From: jedent@Sam.Neosoft.Com (Joel E. Davis) Newsgroups: rec.radio.amateur.homebrew Subject: Motorola nicad specks?? Date: Sun, 13 Aug 1995 10:58:02 LOCAL Organization: J.E. Davis Enterprises Lines: 5 Message-ID: NNTP-Posting-Host: scooter-slip-b2.neosoft.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] Could someone give me the AH cap of Motorola NTN 54488 (ALTERNATE TO NTN4825A & NTN5448A) 10 volt NICAD? Also looking at the back of this batt there are four(4) metal terms for charging. I need to know what they are for. I know the left most one is + , next one unknown, next one - (neg), right most unknown. Thanks Joel D. K5ZCX From amsoft@epix.net Mon Aug 14 21:09:56 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!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: need dead plugin for FTV901R Date: 11 Aug 1995 23:09:47 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 5 Sender: root@newsbf02.news.aol.com Message-ID: <40h61r$7q3@newsbf02.news.aol.com> Reply-To: n1ddzrjc@aol.com (N1DDZ RJC) NNTP-Posting-Host: newsbf02.mail.aol.com If you happen to have a plug in for any band that goes with the FTV901R transverter I'd like to buy it from you. Since I want to build a 220 xverter, a blown out or otherwised damaged plug in is fine. Bob Crowley, Staff Inventor Input Devices, Wayland MA From amsoft@epix.net Mon Aug 14 21:09:57 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!nwfocus1.wa.com!news1.halcyon.com!coho.halcyon.com!mcraw From: Marshall Craw Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: NEW HAM RADIO REMOTE CONTROL PRODUCT OFFERED Date: Sun, 13 Aug 1995 15:51:33 -0700 Organization: Northwest Nexus Inc. Lines: 30 Message-ID: References: NNTP-Posting-Host: coho.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Xref: grape.epix.net rec.radio.amateur.equipment:15797 rec.radio.amateur.homebrew:8939 rec.radio.amateur.digital.misc:10023 I am pleased to announce a new product offered by Positive Time Systems called the RCS-I. This is a radio controller that connects to any VHF/UHF transceiver and can issue x-10 commands. (X-10 is a power line standard for controlling devices throughout a building. Sears, Radio Shack, and others offer these compatible units) The unit also has an alarm input, a listen feature, a short voicmail box, and responds to all commands in a pleasant female voice. The system IDs with your recorded voice and call sign. This description doesn't do the product justice, so please check out the new homepage at : http://www.halcyon.com/pos.time.sys/top or you may email us with you address so that we can promptly send you our brochure and newsletter. NOTE: This product is intended for US voltages of 120 / 220 VAC. Another version is offered to support other international power standards. FLASH! NEW FEATURE! The RCS-I has a new feature called Secure Access Mode(SAM). When enabled, the access code changes dozens of times per hour, making it virtually impossible to hack into. Thank You, Marshall Craw Positive Time Systems North Bend, WA From amsoft@epix.net Mon Aug 14 21:09:57 1995 Path: grape.epix.net!news.sprintlink.net!news.clark.net!starport!brian.carling Distribution: world Newsgroups: rec.radio.amateur.homebrew Subject: Phone Line Status Indicat From: brian.carling@acenet.com (Brian Carling) Message-ID: <2a6.4185.546@acenet.com> References: <40in01$mgk@ixnews6.ix.netcom.com> Date: Sun, 13 Aug 1995 14:48:00 -0500 Organization: =ACE= ONLINE (301)942-2218 Lines: 23 Newsgroups: rec.radio.amateur.homebrew From: brian.carling@acenet.com Hi Kevin. I would like to make the same. If you get some info could you let me know? (Assuming that they will EVENTUALLY repair the Internet connection that gets us our inbound E-mail here) E-mail has been down about 2 weeks or more now. KW>I know this isn't Ham-related, but I figure with the tallent on this KW>Newsgroup, I should be able to get an answer... KW>I'm looking for a circuit that I can add to a phone/phone line to show KW>if the line is in use. A simple LED would be just fine. The problem is KW>that when I'm on the modem, no one in the house knows it and may pick KW>up the phone, bumping me off whatever I'm doing. A simple indicator KW>would be just what I need. KW>Thanks for the info... Kevin N1EPU --- þ SLMR 2.1a þ Why is it that the best taglines are always much too lon From amsoft@epix.net Mon Aug 14 21:09:58 1995 Path: grape.epix.net!news.sprintlink.net!simtel!news.kei.com!newshost.marcam.com!zip.eecs.umich.edu!caen!ranecurl From: ranecurl@engin.umich.edu (Rane Curl) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Phone Line Status Indicat Date: 14 Aug 1995 05:09:39 GMT Organization: University of Michigan Engineering, Ann Arbor Lines: 27 Sender: ranecurl@umich.edu Message-ID: <40mlqj$g6h@srvr1.engin.umich.edu> References: <40in01$mgk@ixnews6.ix.netcom.com> <2a6.4185.546@acenet.com> NNTP-Posting-Host: ca.engin.umich.edu In article <2a6.4185.546@acenet.com>, Brian Carling wrote: >Newsgroups: rec.radio.amateur.homebrew >KW>I know this isn't Ham-related, but I figure with the tallent on this >KW>Newsgroup, I should be able to get an answer... > >KW>I'm looking for a circuit that I can add to a phone/phone line to show >KW>if the line is in use. A simple LED would be just fine. The problem is >KW>that when I'm on the modem, no one in the house knows it and may pick >KW>up the phone, bumping me off whatever I'm doing. A simple indicator >KW>would be just what I need. > >KW>Thanks for the info... Kevin N1EPU There are simple circuits for detecting the off-hook condition. For example, in _The Talking Telephone_ (Tab Books, 1990). Kits are also available, often at hamfests. These use a separate 9V battery since the phone company frowns upon users lighting their homes off the phone battery. I solved this problem by having another phone line installed. The inconvenience to my net habits became much less important than the amount of time I tied up the phone so others could not use it. Rane Curl N8REG From amsoft@epix.net Mon Aug 14 21:09:59 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!howland.reston.ans.net!ix.netcom.com!netnews From: kwebster@ix.netcom.com (Kevin Webster) Newsgroups: rec.radio.amateur.homebrew Subject: Phone Line Status Indicator Date: Sat, 12 Aug 1995 17:03:10 GMT Organization: Netcom Lines: 12 Message-ID: <40in01$mgk@ixnews6.ix.netcom.com> NNTP-Posting-Host: ix-nhv-ct2-15.ix.netcom.com X-Newsreader: Forte Free Agent 1.0.82 I know this isn't Ham-related, but I figure with the tallent on this Newsgroup, I should be able to get an answer... I'm looking for a circuit that I can add to a phone/phone line to show if the line is in use. A simple LED would be just fine. The problem is that when I'm on the modem, no one in the house knows it and may pick up the phone, bumping me off whatever I'm doing. A simple indicator would be just what I need. Thanks for the info... Kevin N1EPU From amsoft@epix.net Mon Aug 14 21:09:59 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.iii.net!news From: Matt Reilly Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematic Draw Program Recommendations? Date: 13 Aug 1995 13:20:39 GMT Organization: iii.net Lines: 9 Message-ID: <40ku7q$8kd@news.iii.net> References: <3vsrso$m7a@ixnews3.ix.netcom.com> <4042u1$2a2@cc.iu.net> NNTP-Posting-Host: kb1vc.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; Linux 1.2.8 i486) X-URL: news:DD444G.EMI@sunsrvr6.cci.com I can second the recommendation of PADS/PCB for DOS, though the schematic capture isn't the nicest I've used, just the nicest FREE stuff I've used. Does anyone have a recommendation for a LINUX schematic capture package? There must be one out there. matt (KB1VC) From amsoft@epix.net Mon Aug 14 21:10:00 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematic Draw Program Recommendations? Date: Sun, 13 Aug 95 16:07:20 GMT Lines: 15 Message-ID: <808330849.9553@pinetree.microserve.com> References: <3vsrso$m7a@ixnews3.ix.netcom.com> <4042u1$2a2@cc.iu.net> <40ku7q$8kd@news.iii.net> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 In article <40ku7q$8kd@news.iii.net>, Matt Reilly wrote: >I can second the recommendation of PADS/PCB for DOS, >though the schematic capture isn't the nicest I've used, >just the nicest FREE stuff I've used. I've been using an illustrator program program to draw occasional schematics. It's extremely tedious and time consuming. Can you tell me where I can find the free software you mentioned? Thanks & 73, Jack WB3U From amsoft@epix.net Mon Aug 14 21:10:00 1995 Path: grape.epix.net!usenet From: generad@epix.net Newsgroups: rec.radio.amateur.homebrew Subject: Transceiver "Tether" Date: 13 Aug 1995 21:04:48 GMT Organization: epix.net Lines: 11 Message-ID: <40lpdg$b1k@grape.epix.net> NNTP-Posting-Host: pclkppp32.epix.net X-Newsreader: WinVN 0.92.2 Sometimes... I use my cordless telephone to operate my 2 meter transceiver. Very handy for when I need to be in front of my computer (50' away in another room) or when nature calls in the middle of a QSO! I designed the circuit about a year ago....and never went any further with it. The guys on my favorite repeater tell me it sounds great. (In fact they can't even tell when I'm using it.) They call it the "Tether"., and they think I'm nuts for not marketing it. Maybe they're right. Is anybody interested? Gene K2LYU (generad@epix.net) From amsoft@epix.net Mon Aug 14 21:10:01 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!usc!nic-nac.CSU.net!csulb.edu!info.ucla.edu!unixg.ubc.ca!news!cln.etc.bc.ca!gcarlisl From: gcarlisl@cln.etc.bc.ca (Gale Carlisle) Subject: TUBES > JAN -- EIA X-Nntp-Posting-Host: cln.etc.bc.ca Message-ID: <1995Aug11.225548.22499@news.etc.bc.ca> Originator: gcarlisl@cln Sender: news@news.etc.bc.ca (System Administration) Reply-To: gcarlisl@cln.etc.bc.ca (Gale Carlisle) Organization: The Education Technology Centre of British Columbia. (Canada) Date: Fri, 11 Aug 1995 22:55:48 GMT Lines: 13 Would someone be able to supply me with common EIA numbers for these military JAN parts. 6829 5814A 5687W 5686 417A 6688 6189W Thanks in advance Steve Carlisle VE7AHL From amsoft@epix.net Mon Aug 14 21:10:02 1995 Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc Path: grape.epix.net!news.sprintlink.net!in2.uu.net!vanbc.wimsey.com!io.org!torfree!aa005 From: aa005@torfree.net (Colin McGregor) Subject: Re: US Military Field Expedient Antennas Message-ID: Followup-To: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc Organization: Toronto Free-Net X-Newsreader: TIN [version 1.2 PL2] References: <9508090927.AA22216@ukpyr2.uk.oracle.com> Date: Sat, 12 Aug 1995 17:06:07 GMT Lines: 45 Xref: grape.epix.net rec.radio.amateur.antenna:12826 rec.radio.amateur.homebrew:8918 rec.radio.amateur.misc:84809 Peter Glibbery (pglibber@uk.oracle.com) wrote: [stuff deleted] : I'm writing from the UK and the references mentioned in the manual are not at : all easy to come by - I've tried. : 1) In the case of some of these designs there is a need for a 'ground'. The The word in the U.K. for 'ground' is 'earth'. : diagrams in the manual show one end of a wire attached to a metal stake which : is pushed into the ground, while the other end is attached to the radio set : itself. Where on the radio set is the free end of the ground wire attached ? Is : it attached to some kind of socket, or do you somehow attach it to the body of : the radio set ? Depends on make/model of radio, often a screw designed just for attaching a grounding wire. : 2) When using a 1/2-Rhombic the manual mentions that you feed the two 1/4 wave : antenna elements from the centre using a 'coax'. What exactly is a 'coax' and : how does it differ from the antenna wire itself ? Coax is short for coaxial cable. A shielded cable (ie: conductor surrounded by insulation, a shield (ie: a conductor), and more insulation). : 3) With the 1/2-Rhombic design the manual suggests that if a coax is not : available to use a 'twisted pair'. What is a twisted pair ? My guess is two : sheathed copper wires twisted together - but is this too simple a thought ? Your guess is right re: twisted pair, two insulated wires twisted together. : 4) With the 1/2-Rhombic one end of the antenna wire is attached to a : terminating resistor. The idea of this resistor is to give some : directionality to the radio wave (I recognise that there is a difference : between a resistor and an insulator (in the later case, the manual suggests a : piece of wood or a C-ration spoon)). Does anyone have a good idea of what would : make a good field expedient resistor ? On this one you have got me. Colin McGregor - VE3ZAA From amsoft@epix.net Mon Aug 14 21:10:03 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Re: US Military Field Expedient Antennas Date: Sat, 12 Aug 95 18:20:46 GMT Organization: TSE Systems Lines: 27 Message-ID: <40irfi$hk1@solaris.cc.vt.edu> References: <9508090927.AA22216@ukpyr2.uk.oracle.com> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 Xref: grape.epix.net rec.radio.amateur.antenna:12828 rec.radio.amateur.homebrew:8921 rec.radio.amateur.misc:84811 In article , aa005@torfree.net (Colin McGregor) wrote: >Peter Glibbery (pglibber@uk.oracle.com) wrote: > >[stuff deleted] [More stuff deleted] [Need for resistor to load rhombic antenna] >: piece of wood or a C-ration spoon)). Does anyone have a good idea of what would >: make a good field expedient resistor ? > >On this one you have got me. * Carbon rod from dry-cell battery (not alkaline) Resistance of these is quite low (1-5 ohms) * Pencil "lead", also likely to be too low in resistance to serve as antenna load. * Bare wires dipped in container of salt water. Will not withstand DC or much AC current flow without corrosion. Also likely to corrode by itself, depending on choice of materials. * Antenna input of another receiver. -Mike KD4QDM From amsoft@epix.net Mon Aug 14 21:10:03 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!tank.news.pipex.net!pipex!plug.news.pipex.net!pipex!dish.news.pipex.net!pipex!gwen.pcug.co.uk!kate.ibmpcug.co.uk!gbscomms!gordy Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc Message-ID: <911@gbscomms.win-uk.net> References: <9508090927.AA22216@ukpyr2.uk.oracle.com> Reply-To: gordy@gbscomms.win-uk.net (Gordon B. Slater) From: gordy@gbscomms.win-uk.net (Gordon B. Slater) Date: Sun, 13 Aug 1995 14:37:45 GMT Subject: Re: US Military Field Expedient Antennas Lines: 13 Xref: grape.epix.net rec.radio.amateur.antenna:12853 rec.radio.amateur.homebrew:8936 rec.radio.amateur.misc:84853 >: 4) With the 1/2-Rhombic one end of the antenna wire is attached to a >: terminating resistor. The idea of this resistor is to give some >: directionality to the radio wave (I recognise that there is a difference >: between a resistor and an insulator (in the later case, the manual suggests a >: piece of wood or a C-ration spoon)). Does anyone have a good idea of what would >: make a good field expedient resistor ? > >On this one you have got me. iron wire is often used. at rf is has quite high resistance, but it varies with wire type, condition (corrosion) etc. Gordy -- Caution: Keys now changed at random security intervals. Contact for current armoured transport file. "You are reminded that this is an insecure circuit. The use of names, ranks and classified information is forbidden." From amsoft@epix.net Mon Aug 14 21:10:04 1995 Path: grape.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: ibmdelf@aol.com (IBM Del F) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Re: US Military Field Expedient Antennas Date: 14 Aug 1995 00:33:35 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 13 Sender: root@newsbf02.news.aol.com Message-ID: <40mjmv$mej@newsbf02.news.aol.com> References: <911@gbscomms.win-uk.net> Reply-To: ibmdelf@aol.com (IBM Del F) NNTP-Posting-Host: newsbf02.mail.aol.com Xref: grape.epix.net rec.radio.amateur.antenna:12869 rec.radio.amateur.homebrew:8943 rec.radio.amateur.misc:84866 You can also use a standard 'lead' (graphite core) pencil. Attach a wire at each end where you expose the core (alligator clips?). The amount of resistance will vary with the graphite core length, density, diameter. You can increase the resistance by filing through the pencil more or less in the middle but just don't cut all the way through the core or you've ruined it.. The deeper the cut into the graphite core, the higher the resistance, BUT, you will lower the amount of power it can dissipate at that point. The assumption here is that you have some means of determining the resistance as you file into the core if you are concerned about a specific value such as 600 Ohms. Del, KD4B Raleigh, NC From amsoft@epix.net Mon Aug 14 21:10:05 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!bloom-beacon.mit.edu!news.kei.com!newshost.marcam.com!Empire.Net!news.net99.net!news.monmouth.com!usenet From: Jim Hendrickson Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Re: US Military Field Expedient Antennas Date: 14 Aug 1995 01:27:38 GMT Organization: Monmouth Internet Corporation Lines: 2 Message-ID: <40m8qa$t8f@shell.monmouth.com> References: <9508090927.AA22216@ukpyr2.uk.oracle.com> NNTP-Posting-Host: ppp4.monmouth.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Xref: grape.epix.net rec.radio.amateur.antenna:12874 rec.radio.amateur.homebrew:8946 rec.radio.amateur.misc:84872 The terminating resistor is 600 ohms, non inductive. From amsoft@epix.net Mon Aug 14 21:10:05 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Using ZN414 to receive SSB Date: Mon, 14 Aug 95 06:44:46 GMT Lines: 19 Message-ID: <808383493.26211@pinetree.microserve.com> References: <40misn$rp@franklin.cc.utas.edu.au> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 ian.mitchell@research.utas.edu.au (Ian Mitchell) wrote: >The ZN414 is essentialy an RF amplifier and detector with >built in AGC. The problem is how to resolve SSB? Generating >a 455KHz BFO is no problem (using TTL levels), and can be >arranged to switch on and off via uP control. > >I am hesitant of providing a direct BFO signal (not TTL) to >the ZN414 for fear of overloading it. I'm not familiar with the specifics of the ZN414, but the built in AGC might be the most difficult problem. If it's keyed to the detector, you may have a difficult time keeping the BFO from activating the AGC and reducing receiver gain. 73, Jack WB3U From amsoft@epix.net Mon Aug 14 21:10:06 1995 Path: grape.epix.net!news.sprintlink.net!simtel!harbinger.cc.monash.edu.au!newsroom.utas.edu.au!news From: ian.mitchell@research.utas.edu.au (Ian Mitchell) Newsgroups: rec.radio.amateur.homebrew Subject: Using ZN414 to receive SSB Date: 14 Aug 1995 04:19:35 GMT Organization: University of Tasmania Lines: 24 Message-ID: <40misn$rp@franklin.cc.utas.edu.au> NNTP-Posting-Host: pc122.research.utas.edu.au Mime-Version: 1.0 X-Newsreader: WinVN 0.99.2 Hi, I'm trying to design a general coverage receiver using the MC3362 from motorola. I'd like it to receive AM, FM and SSB/CW signals. FM is built in, and I'd like to think I can use the ZN414 for AM, by tapping in to the signal at the output of the second IF filter (455KHz). The ZN414 is essentialy an RF amplifier and detector with built in AGC. The problem is how to resolve SSB? Generating a 455KHz BFO is no problem (using TTL levels), and can be arranged to switch on and off via uP control. I am hesitant of providing a direct BFO signal (not TTL) to the ZN414 for fear of overloading it. I thought of using the BFO signal to switch the SSB signal on and off at 455KHz. Another 455KHz IF filter would be used to reduce harmonics, just before the ZN414. The question is, would this work? Best regards to all, Ian From amsoft@epix.net Mon Aug 14 21:10:07 1995 Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VFO stability Date: Sat, 12 Aug 95 19:29:33 GMT Lines: 30 Message-ID: <808256566.23046@pinetree.microserve.com> References: <40eanf$mb7@tekadm1.cse.tek.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 royle@emerald.cse.tek.com (Roy W Lewallen) wrote: >This has been an interesting thread, and the comments seem to >generally agree with what I've believed for some time: >3. I suspect but haven't confirmed that inductor drift decreases pretty much as Q increases. Therefore, a good-sized air-core inductor would reasonably drift less I've noticed that too. I wonder if the explanation could be that a larger conductor incurs less IR loss, and is also better able to dissipate the minute amount of heat that's generated from this source? Much excellent information has been published on this subject, but I haven't seen any in quite some time. I think many of the tried and true principles that used to be applied have been gradually displaced by the desire to build ever-smaller components. The advent of synthesizers has also had an effect on the popularity of this material. Some of the best information on VFO stability was published in the 60's, a time when VFO builders were still faced with the effects of tube heat and changing operating characteristics. The same methods used then still hold true, and solid-state gear can take even better advantage of them. The trick is finding the info. 73, Jack From amsoft@epix.net Mon Aug 14 21:10:08 1995 Path: grape.epix.net!news.sprintlink.net!psgrain!nntp.teleport.com!usenet From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VFO stability Date: 13 Aug 1995 04:28:12 GMT Organization: ELNEC/EZNEC Software Lines: 34 Message-ID: <40jv0s$2mq@maureen.teleport.com> References: <808256566.23046@pinetree.microserve.com> NNTP-Posting-Host: ip-pdx7-34.teleport.com X-Newsreader: AIR News 3.X (SPRY, Inc.) > jackl@pinetree.microserve.com (WB3U) writes: > royle@emerald.cse.tek.com (Roy W Lewallen) wrote: > >This has been an interesting thread, and the comments seem to > >generally agree with what I've believed for some time: > > >3. I suspect but haven't confirmed that inductor drift decreases > pretty much as Q increases. Therefore, a good-sized air-core inductor > would reasonably drift less > I've noticed that too. I wonder if the explanation could be that a > larger conductor incurs less IR loss, and is also better able to > dissipate the minute amount of heat that's generated from this source? > . . . This stands to reason. Everything else being equal, a higher-Q inductor will generate less heat than a lower-Q one. But all else is seldom equal. The effect of heating is to change the physical dimensions of the coil, which in turn changes the inductance. I would imagine there could be quite a difference in inductance change as a function of temperature depending on the shape of the inductor and the expansion characteristics of the form, if any. Also, as you mention, the amount of temperature rise which results from the heat depends on the heat sinking/dissipating ability of the coil. Hmmm. . . wonder if a shape could be found such that the inductance is constant if all dimensions change in an equal ratio. I'm sure somebody thought of this a generation or two ago. . . Roy Lewallen, W7EL w7el@teleport.com From amsoft@epix.net Mon Aug 14 21:10:09 1995 Path: grape.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: VHF Coaxial Collinear Plans Wanted Date: 12 Aug 1995 12:12:01 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 20 Sender: root@newsbf02.news.aol.com Message-ID: <40ijsh$hsb@newsbf02.news.aol.com> References: <1995Aug10.111431.1@noah> Reply-To: w8jitom@aol.com (W8JI Tom) NNTP-Posting-Host: newsbf02.mail.aol.com Dave, >I need some construction advice on coaxial collinear VHF antennas (you >know, built out of RG/8 or similar). My references (the 1994 ARRL >Antenna Book, the 1994 ARRL Handbook and an older ARRL Antenna >Anthology) are mute on this subject. The reason they are now mute is the early articles (in QST and the Handbooks) were non-functioning antennas. The problem was the velocity of propagation inside the cable and for the parallel radiating surface currents were different. The phase was changed every 1/2 wl for the transmission line currents but the radiating currents didn't change at the correct phase intervals. So the antennas simply didn't work at all, even though they were published and had lengthy explainations of how well they worked. Why not build a skirt collinear or a phased stacked dipole array? 73 Tom From amsoft@epix.net Mon Aug 14 21:10:09 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in1.uu.net!news1.digital.com!nntp-hub2.barrnet.net!pacbell.com!amdahl.com!amd!netcomsv!uucp3.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netcom.com!kjn From: kjn@netcom.com (Ken Navarre) Subject: Re: WTB: Perimeter Intrusion Alarms Message-ID: Organization: Public Seismic Network, San Jose, Ca. X-Newsreader: TIN [version 1.2 PL1] References: <808162706snz@lfheller.demon.co.uk> Date: Fri, 11 Aug 1995 21:54:12 GMT Lines: 13 Sender: kjn@netcom18.netcom.com Leon Heller (Leon@lfheller.demon.co.uk) wrote: : I vaguely remember reading that they experimented with intrusion alarms : using bed-bugs. When anyone was in the vicinity and presumably producing CO2 : or whatever it is that bed-bugs detect, the bugs got excited and started : jumping up and down. The movement was detected and triggered the Tx. I recall reading an article about that. Believe that it was the result of a study done by Behavorial Sciences in D.C. was one of the "think tanks" in the '70s. Ken -- From amsoft@epix.net Mon Aug 14 21:10:10 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WTB: Perimeter Intrusion Alarms Date: Sat, 12 Aug 95 15:37:22 GMT Organization: TSE Systems Lines: 22 Message-ID: <40iht8$hk1@solaris.cc.vt.edu> References: <808162706snz@lfheller.demon.co.uk> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 In article , kjn@netcom.com (Ken Navarre) wrote: >Leon Heller (Leon@lfheller.demon.co.uk) wrote: > >: I vaguely remember reading that they experimented with intrusion alarms >: using bed-bugs. When anyone was in the vicinity and presumably producing CO2 >: or whatever it is that bed-bugs detect, the bugs got excited and started >: jumping up and down. The movement was detected and triggered the Tx. > >I recall reading an article about that. Believe that it was the result of >a study done by Behavorial Sciences in D.C. was one of the "think tanks" >in the '70s. Maybe not as far-fetched as attempts to chemically detect the pungent- smelling "fish sauce" eaten by the VC (as well as most Vietnamese I suppose) to detect when the enemy was near. As I remember (thirdhand), the technology did not work out. I think I have a couple of receivers for an Army intrusion detection system of some sort, they appear to operate on 149.6 MHz NBFM with some sort of digital code. The transmitter part could be excellent for foxhunting if nothing else. -Mike KD4QDM From amsoft@epix.net Mon Aug 14 21:10:11 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!kjn From: kjn@netcom.com (Ken Navarre) Subject: Re: WTB: Perimeter Intrusion Alarms Message-ID: Organization: Public Seismic Network, San Jose, Ca. X-Newsreader: TIN [version 1.2 PL1] References: Date: Sun, 13 Aug 1995 04:59:42 GMT Lines: 13 Sender: kjn@netcom4.netcom.com I wrote: : I'm looking for some of the Vietnam era military surplus seismic : perimeter intrusion alarms. Wanted to thank all the folks who offered suggestions for locating some of these critters. I picked up a set of "new" condition ones at the Foothill College Swap Meet this morning. 4 transmitters and a receiver. Works great! Thanks again! 73s Ken KC6IFF -- From amsoft@epix.net Mon Aug 14 21:10:11 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!kira.cc.uakron.edu!usenet.ins.cwru.edu!agate!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!grian!morris From: morris@grian.cps.altadena.ca.us (Mike Morris) Subject: Re: WTB: Perimeter Intrusion Alarms Message-ID: <1995Aug13.072841.16773@grian.cps.altadena.ca.us> Organization: College Park Software, Altadena, CA Date: Sun, 13 Aug 1995 07:28:41 GMT Lines: 29 mkeitz@bev.net (Mike Keitz) writes: >In article , kjn@netcom.com (Ken Navarre) wrote: >>Leon Heller (Leon@lfheller.demon.co.uk) wrote: >> >>: I vaguely remember reading that they experimented with intrusion alarms >>: using bed-bugs. When anyone was in the vicinity and presumably producing >CO2 >>: or whatever it is that bed-bugs detect, the bugs got excited and started >>: jumping up and down. The movement was detected and triggered the Tx. I heard the story as the bedbugs began to alert their fellows with sound- only the noise was at ultrasonic frequencies. The detector was tuned to a broad range of ultrasonics and triggered the TX. >technology did not work out. I think I have a couple of receivers for an >Army intrusion detection system of some sort, they appear to operate on >149.6 MHz NBFM with some sort of digital code. The transmitter part could >be excellent for foxhunting if nothing else. I have one of the TX's somewhere aroudn here. It is packeged in a very interesting manner. Mike Morris WA6ILQ | All opinions must be my own since nobody PO Box 1130 | pays me enough to be their mouthpiece... Arcadia, CA. 91077 | ICBM: 34.07.930N, 118.03.799W | Reply to: morris@grian.cps.altadena.ca.us -- From amsoft@epix.net Mon Aug 14 21:10:12 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail From: skulyov@freenet.columbus.oh.us (Sergei Kulyov) Newsgroups: rec.radio.amateur.homebrew Subject: WTB:small air vary capacitors Date: 14 Aug 1995 01:04:21 -0400 Organization: The Greater Columbus FreeNet Lines: 8 Message-ID: <40mlgl$d04@acme.freenet.columbus.oh.us> NNTP-Posting-Host: acme.freenet.columbus.oh.us X-Newsreader: TIN [version 1.2 PL2] I'm looking for the small air vary capacitors with C max about 1000 pf. The QTY up to four (4). Appreciate for any help. 73! Sergei AA8OT, UA3AP Columbus, Ohio From amsoft@epix.net Fri Aug 18 14:56:39 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!ix.netcom.com!netnews From: questusa@ix.netcom.com Newsgroups: rec.antiques.radio+phono,rec.audio.marketplace,rec.radio.swap,rec.radio.amateur.homebrew Subject: ***** FS Tubes, Tubes, Tubes ****** Date: Wed, 16 Aug 1995 20:34:55 GMT Organization: Netcom Lines: 24 Message-ID: <40tga6$ipp@ixnews3.ix.netcom.com> NNTP-Posting-Host: ix-den12-12.ix.netcom.com X-Newsreader: Forte Agent .99.82 Xref: grape.epix.net rec.audio.marketplace:18846 rec.radio.swap:41608 rec.radio.amateur.homebrew:8989 We have tens of thousands of tubes For Sale. The old 4-5-6 & 7 pin tubes, octales, 7 & 9 pin minature tubes. For radios TVs, industrial equinment, & test equipment. We have both NEW and USED/SURPLUS tubes that have been tested and are guaranteed. Send us a e-mail note with what you need...and we will reply with price (our low price) and availability. In a hurry? Call us at 303-274-7545 FAX us at 303-274-2317 e-mail questusa@ix.netcom.com visa & mastercard welcome no minimum order ***** WE SHIP WORLD WIDE ***** From amsoft@epix.net Fri Aug 18 14:56:40 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!yama.mcc.ac.uk!thor.cf.ac.uk!thor!spx3atw From: Andrew Webb Subject: 48 MHz circuit. please take a look Sender: news@cf.ac.uk (USENET News System) Message-ID: X-Sender: spx3atw@thor Date: Wed, 16 Aug 1995 15:37:49 GMT X-Nntp-Posting-Host: thor Content-Type: TEXT/PLAIN; charset=US-ASCII Mime-Version: 1.0 Organization: Cardiff University of Wales Lines: 24 A circuit for a 48 MHz TX unit has been uploaded to http://www.cf.ac.uk/uwcc/suon/radio/badger.gif PLease could you take a look, and tell me what you think? The circuit is a 12 MHz crystal osc. followed by a tuned buffer stage, two doubler stages and a driver stage. Output is from the wire that disappears off the right hand side of the screen. The values of the inductors is not included on the diagram. they have been calculated to be resonant at 12, 24, and 48 mhz as appropriate. The inductor in the driver stage is made up of three white Toko S18 air cored coils in series Thanks in advance Andrew Webb, GERME ---------------------------------------------------------- Remember, Be yourself, cos if you're not you, WHO ARE YOU? ---------------------------------------------------------- From amsoft@epix.net Fri Aug 18 14:56:40 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!bah.com!user From: bacca_roberto@bah.com (Roberto Bacca) Newsgroups: rec.radio.amateur.homebrew Subject: A place to download schemtics/fun electronics projects Date: Tue, 15 Aug 1995 20:07:52 -0600 Organization: Booz Allen & Hamilton Lines: 10 Distribution: world Message-ID: NNTP-Posting-Host: 128.229.243.20 Does anyone know of an FTP site wherei can download Schematics/Electoincs projects. If you do please E-Mail me at: bacca_roberto@bah.com From amsoft@epix.net Fri Aug 18 14:56:41 1995 Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!newsfeed.tip.net!news.algonet.se!usenet From: cj@algonet.se (Christer Johansson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: A place to download schemtics/fun electronics projects Date: Wed, 16 Aug 1995 20:48:19 GMT Organization: HTH Lines: 17 Message-ID: <40tlmc$1hp@alecto.algonet.se> References: Reply-To: cj@algonet.se NNTP-Posting-Host: sophocles.algonet.se X-Newsreader: Forte Free Agent 1.0.82 bacca_roberto@bah.com (Roberto Bacca) wrote: >Does anyone know of an FTP site wherei can download Schematics/Electoincs >projects. Try ftp.ee.ualberta.ca in the /pub/cookbook directory. /Christer -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- * High Tech Horizon - Christer Johansson - * email: cj@algonet.se * -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien * >> World Wide Web - http://www.algonet.se/~cj/catalog.html << -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- From amsoft@epix.net Fri Aug 18 14:56:42 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!news.chattanooga.net!usenet From: bpwagner@chattanooga.net (Brian Wagner) Newsgroups: rec.radio.amateur.homebrew Subject: August QST Rock Bender Receiver Date: 16 Aug 1995 20:07:25 GMT Organization: Chattanooga Online Lines: 5 Message-ID: <40tj5t$q0q@news.chattanooga.net> NNTP-Posting-Host: portb03.chattanooga.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.11 I am trying to build this thing and I cannot get hold of Y1 (a 7Mhz crystal supposily sold by Ocean State Electronics). The phone number in QST is wrong. Also where do you get a Mini-Circuits SBL-1 Mixer? Any help would be greatly appreciated. From amsoft@epix.net Fri Aug 18 14:56:43 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!usenet.ins.cwru.edu!gatech!howland.reston.ans.net!news.sprintlink.net!in1.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!news.zynet.com!ez0!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!mgate.arrl.org!not-for-mail From: mtracy@mgate.arrl.org (Mike Tracy) Newsgroups: rec.radio.amateur.homebrew Subject: Re: August QST Rock Bender Receiver Date: 17 Aug 1995 08:33:14 -0400 Organization: American Radio Relay League Lines: 15 Message-ID: <40vcua$h7e@mgate.arrl.org> References: <40tj5t$q0q@news.chattanooga.net> NNTP-Posting-Host: mgate.arrl.org X-Newsreader: TIN [version 1.2 PL2] Brian Wagner (bpwagner@chattanooga.net) wrote: : I am trying to build this thing and I cannot get hold of Y1 (a 7Mhz : crystal supposily sold by Ocean State Electronics). The phone number in : QST is wrong. Also where do you get a Mini-Circuits SBL-1 Mixer? Any : help would be greatly appreciated. Brian, The phone number in QST is off by one digit - the area code should be 401, rather than 400 (ie., 401-596-3080). Note to folks trying to reach Ocean State - their 800 number is no longer in service. Also note that they are swamped with orders whenever their number is published, so if you can't get through (busy or no answer), keep trying. 73 de Michael, KC1SX, ARRL Technical Information Services From amsoft@epix.net Fri Aug 18 14:56:43 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!news.msfc.nasa.gov!europa.chnt.gtegsc.com!ulowell.uml.edu!vtc.tacom.army.mil!news1.oakland.edu!detroit.freenet.org!detroit.freenet.org!rburgan From: rburgan@detroit.freenet.org (Roland B. Burgan) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Calibration of Freq.Counter Date: 17 Aug 1995 15:07:42 GMT Organization: The Greater Detroit Free-Net Lines: 11 Message-ID: <40vlvu$7ag@detroit.freenet.org> NNTP-Posting-Host: detroit.freenet.org One other method that works well is to build a simple 10 Mhz oscillator with a buffer stage. Use a T coax adaptor on the output to drive a piece of wire for the WWV rcvr, and a direct connection to the counter. Zero beat the oscillator, easier brecause of the stronger signal, and adjust the counter when audio beat is no longer flucuating (watch S-Meter on rcvr.) This method will allow you to input a signal directly to the counter on any range input, and adjust even the divide by 256 prescalers (3.90425 Mhz crystals). -- From amsoft@epix.net Fri Aug 18 14:56:44 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!bah.com!user From: bacca_roberto@bah.com (Roberto Bacca) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can Schems/Diags be Posted here? *.uue?? Date: Thu, 17 Aug 1995 01:52:32 -0600 Organization: Booz Allen & Hamilton Lines: 36 Distribution: world Message-ID: References: 01HTV4REJL2A001045@uthscsa.edu> <40bd1d$4d5@nuclear.microserve.net> <40d8ap$dpj@unisql.unisql.com> <40dkoi$i4i@nuclear.microserve.net> <808255764.23046@pinetree.microserve.com> NNTP-Posting-Host: 128.229.243.20 In article <808255764.23046@pinetree.microserve.com>, jackl@pinetree.microserve.com (WB3U) wrote: > mzenier@netcom.com (Mark Zenier) wrote: > >>Anything posted to some groups gets transfered though channels that >>charge by volume. > >>These recipients have no option. They get no preview of the traffic. >>They end up paying, whether the posting is useful to them or not. > >Now that's a valid reason. Of course, it leads to the question of how >to distribute a useful binary. I'm lucky enough to have a personal >anon FTP area available through my service provider, but that's not >always the case. Also, e-mail can be a real pain if too many folks >want a copy. Any suggestions for a work-around, other than starting a >new group? > >73, > >Jack WB3U With the quantity of knowledge and the buying power of this group, we should send a letter to a company like Motorola, Radio Shack MCM electronics etc., and ask them if they would found a web server to store, post, schematics, they could also advertise their parts, new products etc. after all they already have an Internet connection (IÕm assuming) they would only need a server. Any Ideas bacca_roberto@bah.com From amsoft@epix.net Fri Aug 18 14:56:46 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!europa.chnt.gtegsc.com!news.umbc.edu!cs.umd.edu!news.coop.net!news.den.mmc.com!NewsWatcher!user From: thomas.g.booth@den.mmc.com (Booth, Thomas G) Subject: Re: cross reference semiconductors. Message-ID: Followup-To: rec.radio.amateur.homebrew Sender: news@den.mmc.com (News Admin) Nntp-Posting-Host: 160.205.101.24 Organization: A Turbulent One References: <40g9p6$ev3@koala.uwec.edu> <40gn2o$qq4@news1.inlink.com> <40ipvj$vt@koala.uwec.edu> Distribution: usa Date: Thu, 17 Aug 1995 01:02:28 GMT Lines: 53 In article <40ipvj$vt@koala.uwec.edu>, dan drumm wrote: > > raiar@inlink.com (Gary V. Deutschmann, Sr.) wrote: (snip) > >Tip-120s are very common, the NTE number is the generic number for this > >transistor, usually an ECG number would be the same number. ECGs number is > >261. > > > >If you keep parts the way I do, I finally put every transistor in sorted > >envelopes under the ECG number for that part. That way finding them is > >easy. > > OK, a very simple idea. That's the best kind! I guess I'll have to > sit down for an afternoon and enter part numbers. I'll cross them > all to NTE since I have that program handy. > Doing this is indeed an excellent idea. However, one needs to remember that oftentimes the NTE part may have significantly higher ratings than the original part. For example, the 1N4001 through 1N4005 diodes crosslist to the same NTE part (NTE 116), which w/ its 600 V PIV rating can be used as a single substitute for these JEDEC parts. Having a bunch of 1N4001 through 1N4005 parts in a bin marked "NTE 116" is OK, but mindlessly grabbing a 1N4001 out of the bin for use in a circuit where a 400 V PIV rated device is called for could result in a failed circuit. My point is, be aware of reduced component ratings if you mix together a bunch of different parts in a bin. You could try segregation of parts within your bins (through bagging or other means) to help prevent putting a "runt" part in a circuit. As another poster suggested in this thread, there are other crosslisting resources available. I've used NTE, ECG & SK cross reference guides for years, and I've also used the old Raytheon REN and Motorola HEP guides as well. Sams has published transistor substitution books in the past, and I'd recommend getting your hands on one. There's a shareware tool for IBM PCs called SCRL (can't remember the exact name corresponding to the acronym @ the moment); I believe you can find it on the SimTel mirrors or on other ftp sites - look for a file named scrl50.zip. Sometimes, old manufacturers' databooks can be useful - for instance, the mid '60s Motorola databooks had a fairly complete listing of 1N & 2N parts (for that time), the minimum characteristics of each JEDEC part, & some Motorola recommended substitutes for a given part. Some databooks (such as Siliconix and old Sprague books) give good clues to devices which share a common fabrication process, and could be an alternate cross reference source. You might also consider getting your hands on some Japanese transistor specification books, such as the ones MCM Electronics has sold periodically; such books may be the only way to get device ratings for a 2Sx part if you can't find it listed in the usual cross reference guides. TGB \\ The opinions expressed herein are my own. // From amsoft@epix.net Fri Aug 18 14:56:46 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!newsadmin From: Gary Davis Newsgroups: rec.radio.amateur.homebrew Subject: Divide by ten front end for frequency counter Date: 16 Aug 1995 02:33:53 GMT Organization: University of Oregon Lines: 7 Message-ID: <40rleh$i0h@pith.uoregon.edu> NNTP-Posting-Host: cisco-ts5-line24.uoregon.edu My frequency counter tops out at 30Mhz. I would like to build a divide by ten front end to increase the range to 300Mhz. Can anyone refer me to a schematic that would serve this purpose? Any and all replies will be most appreciated. Regards, Gary Davis From amsoft@epix.net Fri Aug 18 14:56:47 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!torn!nott!nrcnet0.nrc.ca!ratilal From: ORBAN@amt00.ime.nrc.ca (Peter Orban) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Divide by ten front end for frequency counter Date: 16 Aug 1995 13:53:34 GMT Organization: National Research Council of Canada Lines: 19 Distribution: world Message-ID: <40st8u$h1t@nrcnet0.nrc.ca> References: <40rleh$i0h@pith.uoregon.edu> NNTP-Posting-Host: nrcamt.ime.nrc.ca X-News-Reader: VMS NEWS 1.13 In-Reply-To: Gary's message of 16 Aug 1995 02:33:53 GMT In <40rleh$i0h@pith.uoregon.edu> Gary writes: > My frequency counter tops out at 30Mhz. I would like to build a > divide by ten front end to increase the range to 300Mhz. Can anyone > refer me to a schematic that would serve this purpose? Any and all replies > will be most appreciated. > Those circuits usually use a 11C90 which is an ECL circuit with TTL interface, if I am correct. Does anyone know who sells that chip in small quantities as well as the Harris (Intersil) ICM7216 series chips? Thanks, Peter -- Peter Orban National Research Council of Canada Internet: peter.orban@nrc.ca From amsoft@epix.net Fri Aug 18 14:56:47 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!uknet!trog.dra.hmg.gb!phoenix.dra.hmg.gb!djch From: djch@rivers.dra.hmg.gb (David Hutchinson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Divide by ten front end for frequency counter Date: 17 Aug 1995 13:21:40 GMT Organization: CSE2, DRA Malvern, England, UK Lines: 6 Distribution: world Message-ID: References: <40rleh$i0h@pith.uoregon.edu> <40st8u$h1t@nrcnet0.nrc.ca> NNTP-Posting-Host: tamar.dra.hmg.gb Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit In-reply-to: ORBAN@amt00.ime.nrc.ca's message of 16 Aug 1995 13:53:34 GMT ARRL 1991 handbook has a nice counter front-end, with a MMIC amplifier before the divider. I'm using this, except I use two MAV-3 amps, as they were to hand. I get about 10-20 mV rms upto 550 MHz. --David G8SQH From amsoft@epix.net Fri Aug 18 14:56:48 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!news.msfc.nasa.gov!europa.chnt.gtegsc.com!ulowell.uml.edu!vtc.tacom.army.mil!news1.oakland.edu!detroit.freenet.org!detroit.freenet.org!rburgan From: rburgan@detroit.freenet.org (Roland B. Burgan) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Divide by ten front end for frequency counter Date: 17 Aug 1995 15:14:53 GMT Organization: The Greater Detroit Free-Net Lines: 8 Message-ID: <40vmdd$97f@detroit.freenet.org> NNTP-Posting-Host: detroit.freenet.org I have been informed by a number of sources that the 11C90 is no longer available. I have not seen any divide by 10 (or 100) IC's available for some time, now. Check with some surplus equipment dealers for used counter converters, such as Tucker Electronics (ask for the test equipment catalog) (they also have a general electronics,communications catalog). -- From amsoft@epix.net Fri Aug 18 14:56:48 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!canyon.sr.hp.com!donrm From: donrm@sr.hp.com (Don Montgomery) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Divide by ten front end for frequency counter Date: 17 Aug 1995 20:17:38 GMT Organization: Hewlett Packard Sonoma County Lines: 10 Message-ID: <410852$3mn@canyon.sr.hp.com> References: <40rleh$i0h@pith.uoregon.edu> NNTP-Posting-Host: mtleng02.sr.hp.com X-Newsreader: TIN [version 1.2 PL2] Gary Davis (gdavis@gladstone.uoregon.edu) wrote: > My frequency counter tops out at 30Mhz. I would like to build a Try the Motorola MC12080; a 1.1GHz prescaler that will divide by 10,20,40 or 80. Runs off 5 volts, consumes 3.7 mA, in a 8 pin plastic DIP or SOIC. Operating window looks like it might make it down to 2 meters. Don Montgomery, K6LTS donrm@sr.hp.com From amsoft@epix.net Fri Aug 18 14:56:49 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!EU.net!news.sprintlink.net!in1.uu.net!news.ultranet.com!amber1.ultranet.com!user From: acj@ultranet.com (Jon Goguen) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Divide by ten front end for frequency counter Date: 18 Aug 1995 03:06:08 GMT Organization: UltraNet Communications, Inc. Lines: 31 Message-ID: References: <40vmdd$97f@detroit.freenet.org> NNTP-Posting-Host: amber1.ultranet.com X-Newsreader: Value-Added NewsWatcher 2.0b22.0+ In article <40vmdd$97f@detroit.freenet.org>, rburgan@detroit.freenet.org (Roland B. Burgan) wrote: > I have been informed by a number of sources that the 11C90 is no > longer available. I have not seen any divide by 10 (or 100) > IC's available for some time, now. Check with some surplus > equipment dealers for used counter converters, such as > Tucker Electronics (ask for the test equipment catalog) > (they also have a general electronics,communications catalog). > -- Motorola makes an ECL part called a universal hexadecimal counter (MC10H136P, $12.54 in single quanity according to a recent Newark catalog). As I understand it, this counter can be used as a programmable divider with the divisor having any desired value between 1 and 256, including 10. This is done by presetting the counter with a (binary equivalent) value of 256-(desired divisor), and then counting the carry output. Each time the counter rolls over, it resets to the preset value, and counts from there to 256. It would be easy to make a switchable divide by 10--divide by 100 counter by switching the preset between 246 and 156. This counter works up to 550 MHz if I remember the spec. correctly. Good luck! Jon -- Jon Goguen "Nothing worth knowing can be understood by the human mind." From amsoft@epix.net Fri Aug 18 14:56:50 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!agate!news.mindlink.net!news From: Jim_pestell@mindlink.bc.ca (jim pestell) Newsgroups: rec.radio.amateur.homebrew Subject: Drake TR7 Date: Thu, 17 Aug 1995 02:27:53 GMT Organization: MIND LINK! - British Columbia, Canada Lines: 5 Message-ID: <40u9gs$kd0@fountain.mindlink.net> NNTP-Posting-Host: line156.nwm.mindlink.net X-Newsreader: Forte Free Agent 1.0.82 I have a Drake tr7 and wish to put it on the new 17 and 12 meter bands, some one heard that it is just a simple matter of cutting out 2 diods, any one know about this?? From amsoft@epix.net Fri Aug 18 14:56:50 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!news.sprintlink.net!news.azstarnet.com!usenet From: Wes Stewart Newsgroups: rec.radio.amateur.homebrew Subject: Re: Drake TR7 Date: 17 Aug 1995 03:27:14 GMT Organization: Arizona Daily Star - AZSTARNET Lines: 13 Message-ID: <40ucui$mrq@news.azstarnet.com> References: <40u9gs$kd0@fountain.mindlink.net> NNTP-Posting-Host: sprite187.azstarnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b2 (Windows; I; 16bit) Jim_pestell@mindlink.bc.ca (jim pestell) wrote: >I have a Drake tr7 and wish to put it on the new 17 and 12 meter >bands, some one heard that it is just a simple matter of cutting out 2 >diods, any one know about this?? > It's even simplier than that. As I recall I did it by opening one circuit trace on the bottom of the motherboard. Off hand, I don't remember which one, but I'll dig out the manual (it's in my storage room) when I get over my cold. If you don't get another answer, email me to jog my memory, cuz this newsreader trashes things sometimes. 73, Wes -- n7ws@azstarnet.com or wdstewart@ccgate.hac.com From amsoft@epix.net Fri Aug 18 14:56:51 1995 Path: grape.epix.net!news.sprintlink.net!gatech!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!ames!olivea!flash!archive From: archive@flash.ATC.Olivetti.Com (DCG Mktg Docmnt (Ivrea)) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Drake TR7 help Date: 17 Aug 1995 17:22:07 GMT Organization: Olivetti ATC; Sunnyvale, CA USA Lines: 15 Message-ID: <40vtrv$bc8@olivea.ATC.Olivetti.Com> NNTP-Posting-Host: flash.atc.olivetti.com Xref: grape.epix.net rec.radio.amateur.equipment:15977 rec.radio.amateur.misc:85100 rec.radio.amateur.homebrew:9013 I have the problem with the receiver part of the transceiver Drake TR7 serial number 6052. The audio reproduction is not clear compared with the other trtx connected to the same antenna and tuned to the same signal. I don't know if it is a fault of the my rtx , or the rtx produced at a certain period, and if successive versions have eliminated the problem, and how. Is anybody able to help me? Tanks in advance My e-mail address is: maurizio@caramba.ico.olivetti.com From amsoft@epix.net Fri Aug 18 14:56:52 1995 Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!emory!cssun.mathcs.emory.edu!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Drake TR7 help Message-ID: <1995Aug18.145511.8228@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <40vtrv$bc8@olivea.ATC.Olivetti.Com> Date: Fri, 18 Aug 1995 14:55:11 GMT Lines: 20 Xref: grape.epix.net rec.radio.amateur.equipment:16009 rec.radio.amateur.misc:85161 rec.radio.amateur.homebrew:9040 In article <40vtrv$bc8@olivea.ATC.Olivetti.Com> archive@flash.ATC.Olivetti.Com (DCG Mktg Docmnt (Ivrea)) writes: >I have the problem with the receiver part of the transceiver Drake TR7 >serial number 6052. The audio reproduction is not clear compared with >the other trtx connected to the same antenna and tuned to the same signal. >I don't know if it is a fault of the my rtx , or the rtx produced at a certain >period, and if successive versions have eliminated the problem, and how. >Is anybody able to help me? What do you mean, "is not clear"? Do you mean the frequency response is not flat across the bandwidth of the filter in use, or do you mean that the audio is distorted, or do you mean that the signal is weak and noisy, etc? More information please. Detail the symptoms, and the conditions under which they appear, and we'll try to help. 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 amsoft@epix.net Fri Aug 18 14:56:53 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!alfa02.medio.net!guysmiley.blarg.com!eskimo!news From: wrt@eskimo.com (Bill Turner) Subject: Re: EIMAC 4CX1500A Valve X-Nntp-Posting-Host: tia1.eskimo.com Message-ID: Sender: news@eskimo.com (News User Id) Organization: None X-Newsreader: WinVN 0.93.14 References: Mime-Version: 1.0 Date: Wed, 16 Aug 1995 05:08:55 GMT Lines: 19 In article , paul_git@cix.compulink.co.uk says... > >Hello All > >A friend of mine has an EIMAC 4CX1500A with only 6500 hours running life >so far. -snip- >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> ONLY 6500 hours?? How long are these things supposed to last? I'm building a 4CX1000A amp right now (slightly different tube, but similar construction) and I'd be quite pleased to learn that 6500 hours is not much.... is it? 73, Bill W7LZP wrt@eskimo.com From amsoft@epix.net Fri Aug 18 14:56:53 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!news.duke.edu!usenet From: jimbob@acpub.duke.edu (james P. Meyer) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Got patent approved - but need antenna help. Date: Tue, 15 Aug 1995 23:32:45 GMT Organization: Duke University, Durham, NC, USA Lines: 29 Message-ID: <40rfik$6lm@news.duke.edu> References: <40pdeo$7jv@kaleka.seanet.com> NNTP-Posting-Host: async55.async.duke.edu X-Newsreader: Forte Free Agent 1.0.82 dbonham@dbonham.seanet.com wrote: > I need to transmit at 220 MHz between two fixed, >line-of-sight points. I can use directional antennas at both ends, >but my transmitter can put out only >10 mW. What's the best general antenna design >and how far can I expect to detect an FM signal >that has a deviation of only 300 Hz? >If anyone is interested in helping with this project - let me know. The *best* antenna would be a dish the size of a radio astronomy telescope. You could expect to put the transmitter on the *moon* and still be able to hear it from the earth. I expect though, that that is out of the question. There are many variables to be considered. Give me a personal E-mail message and I'll try to help you sort them out. Jim "With an FCC licence." Meyer P.S. It would make reading your messages easier if you could find out how to make each line average out to about 70 characters in length. From amsoft@epix.net Fri Aug 18 14:56:54 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!in2.uu.net!INbe.net!iphome11 From: frankyb@glo.be (franky b.) Newsgroups: rec.radio.amateur.homebrew Subject: high-speed packet modem Date: Thu, 17 Aug 95 16:44:08 GMT Organization: Globe Internetworking bvba Lines: 11 Distribution: world Message-ID: <40vhhu$485@news.INbe.net> NNTP-Posting-Host: iphome11.glo.be X-Newsreader: News Xpress Version 1.0 Beta #2.1 Hello and thanks for reading my article I'm a belgian Ham who's looking for drawings (shematics) of high-speed (example: G3RUH) modems for packet usage. Or an FTP-site where I can FTP the files of the drawings. Thanks in advance Frankyb@glo.be ON1BP JO11RB From amsoft@epix.net Fri Aug 18 14:56:55 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.uoregon.edu!news.u.washington.edu!uw-beaver!cornellcs!rochester!rit!sunsrvr6!jdc From: jdc@cci.com (James D. Cronin) Subject: Re: How to Space-Wind Coils? Message-ID: Sender: root@sunsrvr6.cci.com (Operator) Organization: Northern Telecom, Network Application Systems References: <808363044.19680@pinetree.microserve.com> Date: Tue, 15 Aug 1995 16:59:52 GMT Lines: 24 In article <808363044.19680@pinetree.microserve.com>, WB3U wrote: >The other day I was in a sporting goods store and noticed >that monofilament line starts at a diameter of about 0.005" (2 lb >test) and goes up in increments of about 0.002 or 0.003 from there. > >This is close to the size of many common wire gauges and I'm wondering >if anyone has ever used fishing line to space-wind a coil? I know the >diameter of different brands will vary, but is it reasonably >consistent throughout the same spool? For my purpose, the exact >spacing is less critical than the need for it to be consistent from >one end of the finished coil to the other. > >Thanks & 73, > >Jack WB3U How about winding on the threads of a bolt or machine screw? It works great. Thanks to Ten-Tec for this tip, from their 6-meter transverter kit instructions. 73...Jim N2VNO From amsoft@epix.net Fri Aug 18 14:56:55 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!news.gmi.edu!msunews!localhost!root From: root@localhost.com (Phil Storm) Newsgroups: rec.radio.amateur.homebrew Subject: Inductor coil Date: 16 Aug 1995 04:48:13 GMT Organization: Interdictor Lines: 11 Message-ID: <40rtad$187j@msunews.cl.msu.edu> NNTP-Posting-Host: via-annex2-16.cl.msu.edu X-Newsreader: TIN [version 1.2 PL2] Hey...I'm building this Radio and I chipped about 20% off of the inductor coil that screws into this metal silver box. The RF signal quality is pretty bad, and I'm associating it with the chipped coil. I've reordered a new one, but it seems odd to me that it still works with the chipped coil. should there be much improvement with the whole coil intact? I don't really know much about how this thing works (all I know is that it tunes the freq.) and I don't know what quality signal to expect. If someone could explain this inductor coil for me... thanks From amsoft@epix.net Fri Aug 18 14:56:56 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: ka7oei@uugate.wa7slg.ampr.ORG Newsgroups: rec.radio.amateur.homebrew Subject: Longwave Transmitter Date: 17 Aug 95 19:59:10 GMT Organization: ucsd usenet gateway Lines: 33 Message-ID: <2545@uugate.wa7slg.ampr.org> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Having operated a "LowFER" station for several years, I might make a comment or two on 'interpretations' of the part 15 rules. The rules actually limit the antenna length to 50 feet ( I can't recall if it's given in feet, or as a metric length, but that's close enough...) The was this is interpreted by most LowFERs is a 35 foot mast, with a 15 foot radius tophat, or something along those lines. With the "typical good" Lowfer transmitter station, the radiated power (with 1 watt "input to the PA" (which can translate to about 960 milliwatts or so with a WB7CAK-type transmitter...) will likely be in the 1 milliwatt region, although 'CAK *did* acheive an efficiency of approximately 1% - but after doing things like having a heavier-guage Litz-wire lo ading coil, auto-antenna tuner, etc.) Officially, the FCC "frowns" on using amateur calls on non-amateur frequencies, but I don't think that it is necessarily illega l. Use of them in leiu of the appropriate call for that frequency/service would be illegal, of course. Many LowFERs use some portion of their ham call as th eir LowFER call (i.e. 9HDQ, or 8LXJ) such that one could logically determine the operator. As for receiving LowFER stations, I have just used my Drake TR-7 along with both an Active whip, and a loaded random-wire (an HF-antenna with a TV-horizontal oscillator coil in series, tuned for resonance) and from a previous QTH (Flagstaff, AZ) I have heard a number of California LowFERs, as well as 9HDQ and 8LXJ in Indiana and Ohio, respectively. I could reliably hear the better- equipped California LowFERs almost any night the static wasn't too terrible... ka7oei@uugate.wa7slg.ampr.org turner@vsat.ussc.com From amsoft@epix.net Fri Aug 18 14:56:57 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!univ-lyon1.fr!elendir From: elendir@enst.fr (Elendir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Modulating VCO's Date: 16 Aug 1995 20:23:28 GMT Organization: ENST - Telecom Paris Lines: 10 Message-ID: <40tk40$5ik@cismsun.univ-lyon1.fr> References: <1995AUG12.4436@ozemail.com.au> NNTP-Posting-Host: julia.enst.fr X-Newsreader: TIN [version 1.2 PL2] Well - I may be horribly wrong on this, but why not use an Armstrong FM modulator ? I have a very fuzzy remembering of this type of modulator, but I faintly remember that it involves a phase shifter and no PLL, other than the one needed to generate the unmodulated carrier. With this scheme, you avoid completly the lock up time. Without any type of warranty ! Vincent, f5rcs From amsoft@epix.net Fri Aug 18 14:56:58 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in1.uu.net!news1.digital.com!nntp-hub2.barrnet.net!venus.sun.com!male.EBay.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Modulating VCO's Date: 16 Aug 1995 22:05:47 GMT Organization: SunSoft South, Los Angeles, CA Lines: 23 Message-ID: <40tq3r$niu@abyss.West.Sun.COM> References: <1995AUG12.4436@ozemail.com.au> <40tk40$5ik@cismsun.univ-lyon1.fr> NNTP-Posting-Host: sunspot.west.sun.com In article <40tk40$5ik@cismsun.univ-lyon1.fr>, Elendir wrote: >Well - >I may be horribly wrong on this, but why not use an Armstrong FM modulator ? >I have a very fuzzy remembering of this type of modulator, but I faintly >remember that it involves a phase shifter and no PLL, other than the one >needed to generate the unmodulated carrier. >With this scheme, you avoid completly the lock up time. > >Without any type of warranty ! > >Vincent, f5rcs Any kind of phase modulation (versus frequency modulation) is going to have inherent pre-emphasis and very poor low frequency response. For sending baseband data (such as 9600 baud GMSK), these are both disadvantages. For sending voice or audio modulated data (such as 1200 baud Bell 202), this is fine. -- * 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 amsoft@epix.net Fri Aug 18 14:56:58 1995 From: Bob.Liesenfeld@f100.n282.z1.fidonet.org (Bob Liesenfeld) Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!news.sprintlink.net!in1.uu.net!rosevax!hamlink!fredmail Newsgroups: rec.radio.amateur.homebrew Subject: Re: Pcb & iron-on transfer Message-ID: <808614707.AA03258@hamlink.mn.org> Date: Thu, 17 Aug 1995 00:09:35 -0100 X-FTN-To: Ai657@freenet.toronto. Lines: 32 AA>From: ai657@freenet.toronto.on.ca (Paul Egan) AA>Newsgroups: rec.radio.amateur.homebrew AA>Subject: PCB & Iron-on transfer? AA>Organization: Toronto Free-Net Inc., Toronto, Ontario, Canada AA>Reply-To: ai657@freenet.toronto.on.ca (Paul Egan) AA>Message-ID: AA>Date: Thu, 10 Aug 1995 15:10:53 GMT AA> AA> AA>I have heard about this method but can't find the product. AA>I believe that the material is run through a photocopier AA>and then ironed to a copper clad board. Sounds like a quick AA>way of getting to the etching stage, without having to use AA>photo-sensitized boards and developer. AA>Any help would be appreciated. AA>Thanks. AA>Paul VE3GFY AA> AA> AA>--- AA> * Origin: HamLink RBBS - 612/HAM-0000 v.34 St. Paul, MN AA>(1:282/100.0)Hi Paul, For what its worth I have tryed this product and was very disapointed. Lots of trouble with traces comming up. Maybe I did something wrong, but don't think so. It is available from Digi-Key in Thief River Falls MN. I can get you the address if you need it. Good luck. 72 Bob WB0POQ Technology is OUT of control..... From amsoft@epix.net Fri Aug 18 14:56:59 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!in1.uu.net!gatech!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Pcb & iron-on transfer Message-ID: <1995Aug17.163714.4246@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <808614707.AA03258@hamlink.mn.org> Date: Thu, 17 Aug 1995 16:37:14 GMT Lines: 16 In article <808614707.AA03258@hamlink.mn.org> Bob.Liesenfeld@f100.n282.z1.fidonet.org (Bob Liesenfeld) writes: > For what its worth I have tryed this product and was very disapointed. >Lots of trouble with traces comming up. Maybe I did something wrong, but >don't think so. It is available from Digi-Key in Thief River Falls MN. >I can get you the address if you need it. The copper has to be *clean*, I mean *really* clean, and the iron has to be at the right temperature (cotton high, and use a cover cloth and a lot of pressure). 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 amsoft@epix.net Fri Aug 18 14:57:00 1995 Path: grape.epix.net!mango.epix.net!gmfoster From: Garry Foster Newsgroups: rec.radio.amateur.homebrew Subject: Re: Pcb & iron-on transfer Date: Thu, 17 Aug 1995 16:56:07 -0400 Organization: epix.net Lines: 12 Message-ID: References: <808614707.AA03258@hamlink.mn.org> NNTP-Posting-Host: mango.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Sender: gmfoster@mango.epix.net In-Reply-To: <808614707.AA03258@hamlink.mn.org> There is a very complete article on this in this months issue of "Nuts and Volts". The author is sold on it but has went to some expense in setting up. There have been some good discussions on this is sci.electronics over the past few months. Many swear by it and some swear at it. I have no experance but from what I have read would give it a try if I had a laser printer. Garry PS I've found many reluctent to allow anyon eto stick strange stuff in thier printers/copiers. From amsoft@epix.net Fri Aug 18 14:57:01 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!sunsrvr6!jdc From: jdc@cci.com (James D. Cronin) Subject: Re: PCB & Iron-on transfer? Message-ID: Sender: root@sunsrvr6.cci.com (Operator) Organization: Northern Telecom, Network Application Systems References: <40dj8e$gmv@unisql.unisql.com> Date: Thu, 17 Aug 1995 15:43:59 GMT Lines: 22 In article , Jay Wicklund wrote: > >I haven't had much luck with it either. I seem to end up with >uneven density of toner on the traces and other copper areas. I've >tried it both with my HP laserjet, and with a standard office >copier. The other problem that I had was patches (both small and >large) that didn't attach to the copper clad when I transferred the >pattern. I sure would like to see an easy way to get the resist >pattern onto the board. > >Jay (KI7RH) We got a laser printer for home use a year or two ago. I got "demo" pages from several brands at the local computer stores, took them home, and tried ironing them to a PC board. There was a wide variation in how well the toner sticks. The cheaper Brother laserprinter was best. 73...Jim N2VNO From amsoft@epix.net Fri Aug 18 14:57:01 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: bcdlr@aol.com (BCdlr) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Phone Line Status Indicat Date: 17 Aug 1995 17:18:36 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 6 Sender: root@newsbf02.news.aol.com Message-ID: <410bnc$k7a@newsbf02.news.aol.com> References: <2a6.4185.546@acenet.com> Reply-To: bcdlr@aol.com (BCdlr) NNTP-Posting-Host: newsbf02.mail.aol.com I have a several schematics laying around to do this. If you want one, email me, and we can talk about which one you would like. Just bought several volumes of the encyclopedia of electronic circuits, by Graf. There are several in there..... Dan Reynolds, bcdlr@aol.com, KB9JLO Dan Reynolds, bcdlr@aol.com, KB9JLO From amsoft@epix.net Fri Aug 18 14:57:02 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!homer.alpha.net!earth.execpc.com!not-for-mail From: thubbard@earth.execpc.com (Terry Hubbard) Newsgroups: rec.radio.amateur.homebrew Subject: Pin Diodes Date: 16 Aug 1995 12:23:39 -0500 Organization: Exec-PC Lines: 3 Distribution: usa Message-ID: <40t9ir$l3t@earth.alpha.net> NNTP-Posting-Host: earth.execpc.com Is it possible to distinguish a pin diode from any other switching type diode found on a hf receiver board? Any ifno appreciated. From amsoft@epix.net Fri Aug 18 14:57:02 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!news.msfc.nasa.gov!europa.chnt.gtegsc.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: Pin Diodes Date: 16 Aug 1995 20:04:40 GMT Organization: Hewlett-Packard Lines: 16 Distribution: usa Message-ID: <40tj0o$6vl@hpscit.sc.hp.com> References: <40t9ir$l3t@earth.alpha.net> NNTP-Posting-Host: hpscrj.scd.hp.com In article <40t9ir$l3t@earth.alpha.net>, Terry Hubbard wrote: >Is it possible to distinguish a pin diode from any other switching type diode >found on a hf receiver board? Any ifno appreciated. You can unsolder it and connect it to a signal generator and excite it at 10 MHz. A regular diode (assuming it's not a power rectifier type) should have little trouble recovering in the 50 nSec. available. A PIN diode will have a very long recovery time and be unable to rectify the 10 MHz. Compare to a known reference like a 1N4148 switching diode. Rick Karlquist N6RK rkarlqu@scd.hp.com From amsoft@epix.net Fri Aug 18 14:57:03 1995 Path: grape.epix.net!mango.epix.net!gmfoster From: Garry Foster Newsgroups: rec.radio.amateur.homebrew Subject: Re: Pin Diodes Date: Thu, 17 Aug 1995 16:48:54 -0400 Organization: epix.net Lines: 31 Message-ID: References: <40t9ir$l3t@earth.alpha.net> <40tj0o$6vl@hpscit.sc.hp.com> NNTP-Posting-Host: mango.epix.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Sender: gmfoster@mango.epix.net In-Reply-To: <40tj0o$6vl@hpscit.sc.hp.com> On 16 Aug 1995, Richard Karlquist wrote: :> In article <40t9ir$l3t@earth.alpha.net>, :> Terry Hubbard wrote: :> >Is it possible to distinguish a pin diode from any other switching :type diode > >found on a hf receiver board? Any ifno appreciated. :> :> :> You can unsolder it and connect it to a signal generator and excite :> it at 10 MHz. A regular diode (assuming it's not a power rectifier :> type) should have little trouble recovering in the 50 nSec. available. :> A PIN diode will have a very long recovery time and be unable to :> rectify the 10 MHz. Compare to a known reference like a 1N4148 :> switching diode. :> :> Rick Karlquist N6RK :> rkarlqu@scd.hp.com "> :> :> Could you post a little more information on this. Do we need to load it with a resistor? Can we just hook it up to a multimeter and see if the RF is detected and varries as we move the signal gen level up and down? It sounds too easy....We all want to make it diffucult. Garry wb0nno From amsoft@epix.net Fri Aug 18 14:57:04 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news From: "Al Koblinski (W7XA)" Subject: Re: Pin Diodes Content-Type: text/plain; charset=us-ascii Message-ID: To: thubbard@earth.execpc.com Sender: news@nsc.nsc.com (netnews maintenance) Nntp-Posting-Host: akoblinski.nsc.com Content-Transfer-Encoding: 7bit Organization: National Semiconductor, Santa Clara References: <40t9ir$l3t@earth.alpha.net> Mime-Version: 1.0 Date: Thu, 17 Aug 1995 20:06:37 GMT X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:40t9ir$l3t@earth.alpha.net Lines: 5 Really, you can only tell by part number. It is unlikely that any but the most recent receivers would have PIN diodes. They are a bit more expensive. From amsoft@epix.net Fri Aug 18 14:57:04 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet From: Grant Youngman Newsgroups: rec.radio.amateur.homebrew Subject: Re: Pin Diodes Date: 17 Aug 1995 21:12:23 GMT Organization: PSI Public Usenet Link Lines: 9 Message-ID: <410bbn$ebp@usenet1.interramp.com> References: <40t9ir$l3t@earth.alpha.net> NNTP-Posting-Host: ip179.dallas.tx.interramp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit) thubbard@earth.execpc.com (Terry Hubbard) wrote: >Is it possible to distinguish a pin diode from any other switching type diode >found on a hf receiver board? Any ifno appreciated. > Not visually, I'm afraid. Check the schematic and match part nos. Grant/NQ5T From amsoft@epix.net Fri Aug 18 14:57:05 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!gatech!usenet.eel.ufl.edu!newsfeed.internetmci.com!psgrain!news.tek.com!mdhost!bens From: bens@mdhost.cse.tek.com (Yauwah Benjamin Sam) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Pin Diodes Date: 17 Aug 1995 22:33:32 GMT Organization: Tektronix, Inc, Beaverton, OR, USA Lines: 15 Distribution: usa Message-ID: <410g3s$769@tekadm1.cse.tek.com> References: <40t9ir$l3t@earth.alpha.net> NNTP-Posting-Host: adelie.cse.tek.com In article <40t9ir$l3t@earth.alpha.net>, thubbard@earth.execpc.com (Terry Hubbard) writes: |> Is it possible to distinguish a pin diode from any other switching type diode |> found on a hf receiver board? Any ifno appreciated. | My experience was PIN diodes have about 1 volt forward drop, while regular silicon signal diodes have 0.6 volt, while Germanium and Schottky Diodes have about 0.3 volt. Regards, Benjamin Sam KC7FGP > From amsoft@epix.net Fri Aug 18 14:57:06 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!lll-winken.llnl.gov!noc.near.net!bloom-beacon.mit.edu!news.moneng.mei.com!news.ecn.bgu.edu!vixen.cso.uiuc.edu!news.uoregon.edu!news.bc.net!unixg.ubc.ca!van-bc!news.wimsey.com!news.rmii.com!nexus.interealm.com!root From: wayne@nexus.interealm.com (wayne wicks) Newsgroups: rec.radio.amateur.homebrew Subject: RCA BT-1 Date: Fri, 18 Aug 1995 05:24:04 GMT Organization: ICG/MagNET (303) 745-9205 Lines: 10 Message-ID: <4117ub$e02@nexus.interealm.com> Reply-To: wayne@nexus.interealm.com NNTP-Posting-Host: ppp207.interealm.com X-Newsreader: Forte Free Agent 1.0.82 I am looking for some of the great RCA engineers or folks who used to work on the old BT-1 AM transmitters. I specifically am looking for a source of the inductor clips that were used on the inductors. They sort of slipped in and locked onto the inductor that was about 3/8". I build verticles and have a number of the inductors and am trying to locate those magic clips. Wayne / wa2kec wayne@nexus.interealm.com From amsoft@epix.net Fri Aug 18 14:57:06 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!uknet!yama.mcc.ac.uk!thor.cf.ac.uk!thor!spx3atw From: webbat1@cf.ac.uk (Andrew T. Webb Esq.) Subject: Request for info on Toko S18 coils. URGENT Sender: news@cf.ac.uk (USENET News System) Message-ID: Date: Wed, 16 Aug 1995 13:27:42 GMT X-Nntp-Posting-Host: thor Reply-To: webbat1@cf.ac.uk Organization: University of Wales College of Cardiff, Cardiff, Wales, UK X-Newsreader: TIN [version 1.2 PL2] Lines: 20 am looking for infomation on the following Tomo S18 coils:- Ferrite cored white ferite cored Violet ferrite cored yellow air cored orange air cored yellow air cored blue Mainly I need the inductances for these coils, and the name of a supplier in Europe to get them from. Also I am looking for the formulae relating the inductance of a coil to the wire diameter, the coil diameter and the number of turns. Thanks in advance. Andrew Webb, webbat1@cf.ac.uk From amsoft@epix.net Fri Aug 18 14:57:07 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon From: Leon Heller Newsgroups: rec.radio.amateur.homebrew Subject: Re: Request for info on Toko S18 coils. URGENT Date: Wed, 16 Aug 95 19:52:41 GMT Organization: Home Lines: 27 Message-ID: <808602761snz@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 In article webbat1@cf.ac.uk "Andrew T. Webb Esq." writes: > am looking for infomation on the following Tomo S18 coils:- > Ferrite cored white > ferite cored Violet > ferrite cored yellow > > air cored orange > air cored yellow > air cored blue > > Mainly I need the inductances for these coils, and the name of a > supplier in Europe to get them from. > > Also I am looking for the formulae relating the inductance of a coil to > the wire diameter, the coil diameter and the number of turns. Go to your local branch of WH Smith and buy a copy of the Cirkit catalogue. Cirkit stock most of the Toko range, and you'll find the S18 parts in the catalogue. If you have problems, phone Cirkit on (01992) 448899. 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 amsoft@epix.net Fri Aug 18 14:57:08 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!usenet.eel.ufl.edu!news.gmi.edu!msunews!localhost!root From: root@localhost.com (Phil Storm) Newsgroups: rec.radio.amateur.homebrew Subject: RF amplifier Date: 16 Aug 1995 04:54:59 GMT Organization: Interdictor Lines: 21 Message-ID: <40rtn3$187j@msunews.cl.msu.edu> NNTP-Posting-Host: via-annex2-16.cl.msu.edu X-Newsreader: TIN [version 1.2 PL2] Does anyone know how to make a cheap RF amplifier? I got this schem out of radio shack, but haven't tried it yet. It says it will increase the signal by 2x. its: | | 9v battery + = = 1k resistor |--------------------------> signal + out ----- 1uf cap| D ------|---| 2N3819 transistor. + in | S ------ -----------------|--------------------------> signal - out - in 9v battery - Sorry for the crappy schematic, but will this work? From amsoft@epix.net Fri Aug 18 14:57:09 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news From: "Al Koblinski (W7XA)" Subject: Re: RF amplifier Content-Type: text/plain; charset=us-ascii Message-ID: To: root@localhost.com Sender: news@nsc.nsc.com (netnews maintenance) Nntp-Posting-Host: akoblinski.nsc.com Content-Transfer-Encoding: 7bit Organization: National Semiconductor, Santa Clara References: <40rtn3$187j@msunews.cl.msu.edu> Mime-Version: 1.0 Date: Wed, 16 Aug 1995 23:35:13 GMT X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:40rtn3$187j@msunews.cl.msu.edu Lines: 10 Not likethat it won't. you will need a resistor from gate to ground, maybe a few hundred k ohm and a parallel capacitor/resistor from the source to ground (or - battery) of a few k ohm and few thousand picofarad. You would be better to use one of the little broadband amps from Mini-Circuits that sells for a few bucks unless you are somewhat familiar with FET designs. Regards, Al From amsoft@epix.net Fri Aug 18 14:57:10 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!in2.uu.net!news.erinet.com!bug.rahul.net!a2i!sierra.net!squaw-d115.sierra.net!user From: tetrault@sierra.net (Robert Tetrault) Newsgroups: rec.radio.amateur.homebrew Subject: Re: RF amplifier Date: Wed, 16 Aug 1995 22:48:40 -0700 Organization: Engineered Solutions Lines: 41 Message-ID: References: <40rtn3$187j@msunews.cl.msu.edu> NNTP-Posting-Host: 204.94.233.115 In article <40rtn3$187j@msunews.cl.msu.edu>, root@localhost.com (Phil Storm) wrote: > Does anyone know how to make a cheap RF amplifier? I got this schem > out of radio shack, but haven't tried it yet. It says it will increase the > signal by 2x. > its: > > | > | 9v battery + > = > = 1k resistor > |--------------------------> signal + out > ----- > 1uf cap| D > ------|---| 2N3819 transistor. > + in | S > ------ > -----------------|--------------------------> signal - out > - in 9v battery - > > Sorry for the crappy schematic, but will this work? It will work even better if you replace the 1k resistor with an inductor/capacitor tuned to the frequency of interest, or just an inductor if you can't find one of those cute little variable caps that look like jelly beans. Depending on your frequency of interest, you might start at an inductor value with a reactance of 1kOhms at that frequency. For example, at 10 MHz, the required inductor value would be about 20 microHenries. The C to resonate at that frequency would be about 20 picoFarads. IF you stay at 1k Ohms, you can scale to other frequencies. You will also need to run a high value resistor to 9V minus from the gate of the FET for it to work; about 100K or more Ohms (very uncritical). Furthermore, the 9V minus supply is not strictly necessary if you make that ground instead of minus. The extra 9V gives you more range for large input voltages without distortion, but is unnecessary if you are only interested in milliVolts or less. From amsoft@epix.net Fri Aug 18 14:57:10 1995 Path: grape.epix.net!news.sprintlink.net!gatech!bloom-beacon.mit.edu!newsserver.pixel.kodak.com!newsserver.rdcs.Kodak.COM!dtcs70!mitchell From: mitchell@dtcs70.kodak.com (Brad Mitchel) Newsgroups: rec.radio.amateur.homebrew Subject: RF TRANSISTORS?? Date: 17 Aug 1995 17:08:36 GMT Organization: Sun Microsystems, Inc. Lines: 16 Distribution: world Message-ID: <40vt2k$njf@kodak.rdcs.Kodak.COM> Reply-To: mitchell@dtcs70.kodak.com NNTP-Posting-Host: dtcs70.dtc.kodak.com Where can I get RF transistors besides RF Parts. They seem a little pricy? 73 --- ----------------- | ___ ________ | Bradley S. Mitchell Senior Project Development Engineer | | / / | | Eastman Kodak Company | | / / | | KEMD Electronic Products | |< < K O D A K| | Circuit Board Assembly Dept. 606 Test Engineering | | \ \ | | 901 Elmgrove Road Rochester, N.Y. 14653-5211 | |__\ \________| | (716) 726-5775, FAX (716) 726-7109 | | INTERNET: bmitchel@kodak.com ----------------- Amateur Radio Callsign WB8YGG From amsoft@epix.net Fri Aug 18 14:57:11 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in2.uu.net!news.iii.net!news From: Matt Reilly Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematic Draw Program Recommendations? Date: 17 Aug 1995 02:09:16 GMT Organization: iii.net Lines: 17 Message-ID: <40u8cv$el@news.iii.net> References: <3vsrso$m7a@ixnews3.ix.netcom.com> <4042u1$2a2@cc.iu.net> <40ku7q$8kd@news.iii.net> <808330849.9553@pinetree.microserve.com> NNTP-Posting-Host: kb1vc.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; Linux 1.2.8 i486) To: jackl@pinetree.microserve.com X-URL: news:808330849.9553@pinetree.microserve.com jackl@pinetree.microserve.com (WB3U) wrote: > >I've been using an illustrator program program to draw occasional >schematics. It's extremely tedious and time consuming. > >Can you tell me where I can find the free software you mentioned? I looked in the comp.lsi.cad faq (on the web and at rtfm.mit.edu) and found url: ftp://wuarchive.wustl.edu/systems/ibmpc/simtel/cad/pads*.zip the archive was busy when I checked, but a LYCOS search for PADS and PCB together should yield a hit or two... matt (kb1vc) From amsoft@epix.net Fri Aug 18 14:57:11 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in1.uu.net!news.delphi.com!usenet From: hurleyr@delphi.com Newsgroups: rec.radio.amateur.homebrew Subject: terminal node controler Date: Wed, 16 Aug 95 20:34:12 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 2 Message-ID: NNTP-Posting-Host: bos1e.delphi.com if anyone could give the plans to build a terminal node controller that work useing a baycomsin using the baycom soft ware if possable the circuit using the am7910 chip thanx From amsoft@epix.net Fri Aug 18 14:57:12 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!freenet.columbus.oh.us!pacific.mps.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!news.delphi.com!usenet From: hurleyr@delphi.com Newsgroups: rec.radio.amateur.homebrew Subject: TNC plans needed Date: Wed, 16 Aug 95 21:57:25 -0500 Organization: Delphi (info@delphi.com email, 800-695-4005 voice) Lines: 6 Message-ID: NNTP-Posting-Host: bos1b.delphi.com if there is someone that has plans to build a tnc or some kind of a modem that would work with the baycom software please send it to me. HURLEYR@DELPHI.COM thanx From amsoft@epix.net Fri Aug 18 14:57:23 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.homebrew Subject: Re: TNC plans needed Date: 17 Aug 1995 14:29:53 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 526 Message-ID: <40vjp1$329e@info4.rus.uni-stuttgart.de> References: NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de In article , wrote: >if there is someone that has plans to build a tnc or some kind >of a modem that would work with the baycom software please send >it to me. > > HURLEYR@DELPHI.COM > thanx From fehner@cts.com Thu Apr 13 09:05:53 MST 1995 Article: 8818 of rec.radio.amateur.digital.misc Newsgroups: rec.radio.amateur.digital.misc From: fehner@cts.com (Barbara Fehner) Subject: Re: Looking for baycom SCHEMA - btnc.gif (1/1) Reply-To: fehner@cts.com Organization: CTS Network Services (CTSNET), San Diego, CA Date: Tue, 11 Apr 1995 22:37:53 GMT Message-ID: X-Newsreader: Forte Free Agent v0.46 References: (none) Sender: news@crash.cts.com (news subsystem) Nntp-Posting-Host: fehnercom.cts.com Lines: 501 begin 644 btnc.gif M1TE&.#=AZ`/N`K,``/___P``````_^#@__\```#_`/___P```/___P`````` M_^#@__\```#_`/___P```"P`````Z`/N`@`$_Q#(2:N]..O-N_]@*(YD:9YH MJJYLZ[YP+,]T;=]XKN]\[__`H'!(+!J/R*1RR6PZG]"H=$JM6J_8K';+[7J_ MX+!X3"Z;S^BT>LUNN]_PN'Q.K]OO^+Q^S^_[_X"!@H.$A8:'B(F*BXR-CH^0 MD9*3E)66EYB9FINHJ:JKK*VNK["QLK.TM;:WN+FZN[R] MOK_`P<+#Q,7&Q\C)RLO,S<[*`8;1S]35UGW3A-G7W-W>:MO:W^/DY5OAXN;J MZU(![N_PZ#[Q\B/N7/"((UZ!E_D^\%/8$&'$A*"^`<@ M&L4.%]EI3+)PFT0="_]3A,0R,@2ZDAT30JP8\./$DC80YH#)`Z5+#2EOX@Q8 MT9_.B#\W"L71<:`1FB203E'*X:13GR*87H$IE475F$\?NK`)U630H6!G>#1: MY*H'LTW05N!J(9]:EF.;/M@CMSNKT8K[!#UZ5WVW3+DN*_WRLA]E..U#CRD/04$X]-O;IPC\F#:R^. 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(1-800-689-0736) Lines: 6 Message-ID: <40uebj$vq$1@mhafn.production.compuserve.com> Xref: grape.epix.net rec.radio.amateur.homebrew:9001 rec.radio.swap:41640 Trade? ICOM IC-R1 receiver, with Hi-capacity NiCad battery, fast charge adapter for internal battery, ICOM drop-in charger, service manual..all excellent. This is the unblocked model. Will consider trade for BRAND new unused SONY SW-100S receiver (Model with hard carrying case, active antenna, power supply accessories) Shipping/insurance prepaid. Sandy Blaize Internet: 70401.134@compuserve.com From amsoft@epix.net Fri Aug 18 14:57:24 1995 Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!uhog.mit.edu!bloom-beacon.mit.edu!news.moneng.mei.com!uwm.edu!bfs.uwm.edu!pff From: pff@bfs.uwm.edu (Paul Fischer) Newsgroups: rec.radio.amateur.homebrew Subject: Trouble with MRF141G - 300 watt amp Date: Thu, 17 Aug 1995 08:37:03 UNDEFINED Organization: Business & Financial Services Lines: 18 Message-ID: NNTP-Posting-Host: 129.89.26.237 X-Newsreader: Trumpet for Windows [Version 1.0 Rev B] I am having trouble with an amplifier I have built per motorola application note AR313. The trouble is the MOSFET conducts (drain to source) when no gate voltage is applied. This is not supposed to happen. This happens regardless of the configuration the gate is in. By this I mean the gate is not supposed to float or be left open at any time. I ground the gate and the devive still conducts! I have checked and rechecked the circuit and all components two dozen times. I have compleletly disassembled the amp and put it back together a piece at a time testing the circuit at each step of the process. It still conducts. The device is not completely turned on as it draws about 700ma. Several other strange things are occuring. When I turn the power off my amp meter still shows the device drawing about 5ma? Stranger yet is that this 5ma draw seems to change with respect to the amount of sunlight hitting the device? When shaded the current draw drops to around 2ma. This is a very simple design and should be easy to build. I have had nothing but trouble. The only thing I can think of is that I am going about testing and setting the idle current all wrong. Does the device need to have input and output loading on it when setting idle current? Or in any testing? Any help would be greatly appreciated. From amsoft@epix.net Fri Aug 18 14:57:25 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!cs.utexas.edu!news.sprintlink.net!in2.uu.net!newsflash.concordia.ca!nstn.ns.ca!coranto.ucs.mun.ca!noah!dbeach From: dbeach@kean.ucs.mun.ca (David Beach, NorFam, Memorial University) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VHF Coaxial Collinear Plans Wanted Date: 16 Aug 95 09:01:02 -0330 NST Organization: Memorial University. St.John's Nfld, Canada Lines: 27 Message-ID: <1995Aug16.090102.1@noah> References: <1995Aug10.111431.1@noah> <40ijsh$hsb@newsbf02.news.aol.com> NNTP-Posting-Host: noah.ucs.mun.ca >>I need some construction advice on coaxial collinear VHF antennas (you >>know, built out of RG/8 or similar). > > The reason they are now mute is the early articles (in QST and the > Handbooks) were non-functioning antennas. > > Why not build a skirt collinear or a phased stacked dipole array? > > 73 Tom > The reason I am interested in the coax version is I have a surplus 150Mhz whip that I think is a coax collinear inside (I x-rayed it!) Before I start hacking it apart to get is to work on 146 Mhz I thought I would try to get some info on the theory. I could, of course, just hammer-and-tongs the project by starting at it with a saw but... Anyway, that's why I wasn't considering some of the other types of antennas as they would not fit inside the hollow mast. I have a very noisy line today - sorry if there are garbage characters!! David Beach VO2BD From amsoft@epix.net Fri Aug 18 14:57:26 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!uwm.edu!cs.utexas.edu!howland.reston.ans.net!ix.netcom.com!netnews From: au@ix.netcom.com (Einstein ) Newsgroups: rec.radio.amateur.homebrew Subject: Where can I find plans for a spark gap transmitter? Date: 17 Aug 1995 19:36:48 GMT Organization: Netcom Lines: 9 Message-ID: <4105og$ev3@ixnews4.ix.netcom.com> NNTP-Posting-Host: ix-eug-or2-06.ix.netcom.com I looking for old plans for a spark gap transmitter. If you have any I'd be happy to pay for copying them. PLEASE no flames! I know that they are illegal to use. This is for a science project and will not be used on amateur or commerical bands. George N7BUI From amsoft@epix.net Fri Aug 18 14:57:27 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!n1ist From: n1ist@netcom.com (Michael L. Ardai) Subject: Re: Where can I find plans for a spark gap transmitter? Message-ID: Organization: Utopia Planetia Shipyards - Mars References: <4105og$ev3@ixnews4.ix.netcom.com> Date: Thu, 17 Aug 1995 20:38:39 GMT Lines: 16 Sender: n1ist@netcom4.netcom.com In article <4105og$ev3@ixnews4.ix.netcom.com> au@ix.netcom.com (Einstein ) writes: -I looking for old plans for a spark gap transmitter. -PLEASE no flames! I know that they are illegal to use. This is for a -science project and will not be used on amateur or commerical bands. ?! It sure will be on the amateur and commercial bands, all at once! We had someone demoing a spark-gap transmitter at the Hoss Traders flea a few years back. Ruined quite a few sales before they announced it on the PA. All HF rigs were braaping the same CW message, no matter where they were tuned :-) /mike -- \|/ Michael L. Ardai N1IST Teradyne ATB, Boston MA -*- ------------------------------------------------------------------------- /|\ ardai@maven.dnet.teradyne.com n1ist@netcom.com From amsoft@epix.net Fri Aug 18 14:57:27 1995 Path: grape.epix.net!usenet From: Garry Foster Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: 17 Aug 1995 21:47:16 GMT Organization: epix.net Lines: 13 Message-ID: <410dd4$rej@grape.epix.net> References: <4105og$ev3@ixnews4.ix.netcom.com> NNTP-Posting-Host: mango.epix.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b4 (Windows; I; 16bit) au@ix.netcom.com (Einstein ) wrote: :I looking for old plans for a spark gap transmitter. If you have any :I'd be happy to pay for copying them. : :PLEASE no flames! I know that they are illegal to use. This is for a :science project and will not be used on amateur or commerical bands. : :>George N7BUI : Just exactly what bands are left? Military/ avation/ And isn't one reason they are illegal is that they cover a large piece of spectrum.. From amsoft@epix.net Fri Aug 18 14:57:28 1995 Path: grape.epix.net!news.sprintlink.net!news.azstarnet.com!usenet From: Wes Stewart Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: 17 Aug 1995 22:05:37 GMT Organization: Arizona Daily Star - AZSTARNET Lines: 18 Message-ID: <410efh$9ln@news.azstarnet.com> References: <4105og$ev3@ixnews4.ix.netcom.com> NNTP-Posting-Host: sprite43.azstarnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b2 (Windows; I; 16bit) au@ix.netcom.com (Einstein ) wrote: >I looking for old plans for a spark gap transmitter. If you have any >I'd be happy to pay for copying them. > >PLEASE no flames! I know that they are illegal to use. This is for a >science project and will not be used on amateur or commerical bands. > >George N7BUI > If you are aware of the illegality of their use, why do you still want to build one. These were outlawed many years ago for good reason. The reasons are even "gooder" today. Please consider the unintended consquences of using one of these and find another project. Maybe you could explain "your" theory. Sincerely, Wes -- N7WS From amsoft@epix.net Fri Aug 18 14:57:28 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!news.larc.nasa.gov!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!news.hawaii.edu!news From: jherman@hawaii.edu Subject: Re: Where can I find plans for a spark gap transmitter? X-Nntp-Posting-Host: math.hawaii.edu Message-ID: Sender: news@news.hawaii.edu Organization: University of Hawaii References: <4105og$ev3@ixnews4.ix.netcom.com> <410dd4$rej@grape.epix.net> Date: Thu, 17 Aug 1995 19:58:25 GMT Lines: 23 Garry Foster writes: >au@ix.netcom.com (Einstein ) wrote: >:I looking for old plans for a spark gap transmitter. If you have any >:I'd be happy to pay for copying them. >:PLEASE no flames! I know that they are illegal to use. This is for a >:science project and will not be used on amateur or commerical bands. >:>George N7BUI >Just exactly what bands are left? Military/ avation/ >And isn't one reason they are illegal is that they cover a large piece of >spectrum.. If it's a low wattage unit and not connected to an antenna then it's not illegal to operate. Various vintage radio groups will fire up their sparkers occassionally to make recordings to send to members and such. The California Wireless Society made such tapes `off-the-air'. George: The best place to start would be to check a college library. Here at UH we have a wealth of info about the history of radio, with many books written by the famous pioneers themselves. Jeff NH6IL From amsoft@epix.net Fri Aug 18 14:57:29 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!nntp.crl.com!pacbell.com!nntp-hub2.barrnet.net!venus.sun.com!male.EBay.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: 18 Aug 1995 01:11:00 GMT Organization: SunSoft South, Los Angeles, CA Lines: 31 Message-ID: <410pb4$f0i@abyss.West.Sun.COM> References: <4105og$ev3@ixnews4.ix.netcom.com> <410dd4$rej@grape.epix.net> NNTP-Posting-Host: sunspot.west.sun.com In article , wrote: >Garry Foster writes: >>au@ix.netcom.com (Einstein ) wrote: > >>:I looking for old plans for a spark gap transmitter. If you have any >>:I'd be happy to pay for copying them. >>:PLEASE no flames! I know that they are illegal to use. This is for a >>:science project and will not be used on amateur or commerical bands. >>:>George N7BUI > >>Just exactly what bands are left? Military/ avation/ >>And isn't one reason they are illegal is that they cover a large piece of >>spectrum.. > >If it's a low wattage unit and not connected to an antenna then it's >not illegal to operate. Various vintage radio groups will fire up >their sparkers occassionally to make recordings to send to members and >such. The California Wireless Society made such tapes `off-the-air'. Umm, Jeff, maybe you ought to have a look at 47 CFR Part 15 regarding permissible levels of unintended radiation before you make a blanket declaration of the legality of operating a spark gap transmitter. I'd guess all but the wimpiest SG transmitter violates some of the limits. Of course, you can operate anything you want in a Faraday cage... -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From amsoft@epix.net Fri Aug 18 14:57:30 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news.sprintlink.net!in2.uu.net!newshost.marcam.com!zip.eecs.umich.edu!caen!ranecurl From: ranecurl@engin.umich.edu (Rane Curl) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: 18 Aug 1995 02:12:51 GMT Organization: University of Michigan Engineering, Ann Arbor Lines: 30 Sender: ranecurl@umich.edu Message-ID: <410sv3$t85@srvr1.engin.umich.edu> References: <4105og$ev3@ixnews4.ix.netcom.com> <410dd4$rej@grape.epix.net> NNTP-Posting-Host: ranecurl@ca.engin.umich.edu In article , wrote: >Garry Foster writes: >>au@ix.netcom.com (Einstein ) wrote: > >>:I looking for old plans for a spark gap transmitter. If you have any >>:I'd be happy to pay for copying them. >>:PLEASE no flames! I know that they are illegal to use. This is for a >>:science project and will not be used on amateur or commerical bands. >>:>George N7BUI > >George: The best place to start would be to check a college library. >Here at UH we have a wealth of info about the history of radio, >with many books written by the famous pioneers themselves. > >Jeff NH6IL One interesting reference is _Wireless Telegraphy and Telephony Simply Explained_ by Alfred P. Morgan (Norman W. Henley Publishing Co., 1915). It shows many circuit diagrams - with the components drawn as pictures - for both untuned and tuned spark transmitters, and also *spark telephony transmitters*. Antenna systems are shown in some detail. There are many photographs of the components (crystal and electrolytic detectors, close coupled helixes, complete station and portable (military) equipment...and photos of Jack Irwin and Fesenden. (The description of the operation of the "Audion" - which was used then only as a detector - is of course not entirely correct.) Rane Curl N8REG From amsoft@epix.net Fri Aug 18 14:57:31 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet From: Grant H Youngman Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: 18 Aug 1995 02:30:49 GMT Organization: PSI Public Usenet Link Lines: 24 Message-ID: <410u0p$qk6@usenet1.interramp.com> References: <4105og$ev3@ixnews4.ix.netcom.com> <410efh$9ln@news.azstarnet.com> NNTP-Posting-Host: ip138.ft.worth.tx.interramp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit) Wes Stewart wrote: >au@ix.netcom.com (Einstein ) wrote: >>I looking for old plans for a spark gap transmitter. If you have any >>I'd be happy to pay for copying them. >> >>PLEASE no flames! I know that they are illegal to use. This is for a >Please consider the unintended consquences of using one of these and find another project. > >Maybe you could explain "your" theory. > > GOOD GRIEF GUYS!!! Is everyone on USenet a JERK?? If you don't have the plans he has been asking for then just shut up, hit the frigging delete key and move on to the next message. This is totally uncalled for, boorish, and JUST PLAIN RUDE. Grant/NQ5T From amsoft@epix.net Fri Aug 18 14:57:31 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!gatech!howland.reston.ans.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!bk296 From: bk296@FreeNet.Carleton.CA (Gordon Symonds) Subject: Re: Where can I find plans for a spark gap transmitter? Message-ID: Sender: bk296@freenet3.carleton.ca (Gordon Symonds) Reply-To: bk296@FreeNet.Carleton.CA (Gordon Symonds) Organization: The National Capital FreeNet Date: Fri, 18 Aug 1995 11:31:21 GMT Lines: 10 I, for one, think that building a spark gap transmitter is a great idea. After all, I have just rounded up the parts and designed a transmitter using PP 10s to go with my 2-tube regenerative ham band receiver. I shall scan my library and send this intrepid enthusiast whatever I have. We builders, after all, must stick together! Gordon Symonds Newsletter Editor, Ottawa Vintage Radio Club (and ham-to-be with my 1926 rig) From amsoft@epix.net Fri Aug 18 14:57:32 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!panix!news.columbia.edu!konichiwa.cc.columbia.edu!jbaltz From: jbaltz@konichiwa.cc.columbia.edu (Jerry B Altzman) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: 18 Aug 1995 13:44:55 GMT Organization: double ionizers association Lines: 22 Message-ID: <4125gn$983@apakabar.cc.columbia.edu> References: <4105og$ev3@ixnews4.ix.netcom.com> NNTP-Posting-Host: konichiwa.cc.columbia.edu In article <4105og$ev3@ixnews4.ix.netcom.com>, Einstein wrote: >I looking for old plans for a spark gap transmitter. If you have any >I'd be happy to pay for copying them. Years ago, when I had one of those Radio Shack 100-in-1-run-wires-to-springs electronics kits, one of the projects they had was a "spark gap generator", which they said you could test by "looking for interference on your TV" whenever you turned it on. Try one of those. >PLEASE no flames! I know that they are illegal to use. This is for a >science project and will not be used on amateur or commerical bands. It will be on *all* the bands, unless you are in a Faraday cage... >George N7BUI //jbaltz jerry b. altzman Entropy just isn't what it used to be +1 212 650 5617 jbaltz@columbia.edu jbaltz@sci.ccny.cuny.edu KE3ML (HEPNET) NEVIS::jbaltz From amsoft@epix.net Fri Aug 18 14:57:33 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!tank.news.pipex.net!pipex!news.sprintlink.net!sunic!sunic.sunet.se!newsfeed.tip.net!venere.inet.it!interland!cesare.lavazza From: Cesare.Lavazza@interland.it (Cesare Lavazza) Date: 16 Aug 95 18:05:56 Newsgroups: rec.radio.amateur.homebrew Subject: Where to ftp schematics Message-ID: <5df_9508162002@interland.it> Organization: InterLand +39-331 67.72.72 Busto Arsizio VA ITALY Lines: 7 Hello All! Does anyone know where to ftp schematics, especially about radio circuits (preamplifiers, transmitters, receivers)? ----------------------------------- E-mail: cesare.lavazza@interland.it From amsoft@epix.net Fri Aug 18 14:57:33 1995 Path: grape.epix.net!sc2c526a.ra.osd.mil!nova.sti.nasa.gov!lerc.nasa.gov!magnus.acs.ohio-state.edu!cis.ohio-state.edu!nntp.sei.cmu.edu!news.psc.edu!hudson.lm.com!news.math.psu.edu!news.cac.psu.edu!newsserver.jvnc.net!newsserver2.jvnc.net!howland.reston.ans.net!vixen.cso.uiuc.edu!news.uoregon.edu!news.bc.net!unixg.ubc.ca!van-bc!news.wimsey.com!news.rmii.com!nexus.interealm.com!root From: wayne@nexus.interealm.com (wayne wicks) Newsgroups: rec.radio.amateur.homebrew Subject: WTB: Eimac 8874 Date: Fri, 18 Aug 1995 05:29:26 GMT Organization: ICG/MagNET (303) 745-9205 Lines: 4 Message-ID: <41188c$e02@nexus.interealm.com> Reply-To: wayne@nexus.interealm.com NNTP-Posting-Host: ppp207.interealm.com X-Newsreader: Forte Free Agent 1.0.82 Looking for a new Eimac 8874 wayne / wa2kec From amsoft@epix.net Mon Aug 21 18:13:01 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news1.digital.com!nntp-hub2.barrnet.net!venus.sun.com!news2me.EBay.Sun.COM!centralnews1.Central.Sun.COM!newsworthy.West.Sun.COM!abyss.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: A 1915 spark gap transmitter Date: 19 Aug 1995 06:03:09 GMT Organization: SunSoft South, Los Angeles, CA Lines: 57 Message-ID: <413uqt$5lj@abyss.West.Sun.COM> References: <410dd4$rej@grape.epix.net> <410pb4$f0i@abyss.West.Sun.COM> NNTP-Posting-Host: sunspot.west.sun.com In article , Jeff NH6IL wrote: >myers@West.Sun.COM (Dana Myers) writes: >> wrote: > >>>If it's a low wattage unit and not connected to an antenna then it's >>>not illegal to operate. Various vintage radio groups will fire up >>>their sparkers occassionally to make recordings to send to members and >>>such. The California Wireless Society made such tapes `off-the-air'. > >>Umm, Jeff, maybe you ought to have a look at 47 CFR Part 15 regarding >>permissible levels of unintended radiation before you make a >>blanket declaration of the legality of operating a spark gap >>transmitter. I'd guess all but the wimpiest SG transmitter >>violates some of the limits. > >Umm, Dana, if we restrict the power lever to that required to fire >the spark plugs on your motorcycle, then we'll satisfy Part 15. (Have >you checked your bike for Part 15 compliance? ;) Given that all three of my remaining motorcycles have resistor spark plugs (which lengthen the time the spark takes place and significantly reduces the RFI issue) and happen to contain the spark gaps inside very small chambers (especially small on the YSR50), they don't create much interference. I suspect they'll do just fine from a Part 15 perspective. >My `blanket declaration' mentioned low wattage with no aerial. A >potentiometer in series with the primary coil will allow the operator >to find the minimal voltage needed to fire a spark across the >electrodes' gap, and we'll want to keep that gap very small. Field >measurements can then be taken to insure compliance with Part 15, >while increasing the voltage across the primary coil. That's not what you originally wrote, but I'm delighted to see that you can benefit from Internet participation and learn something ;-). >The previous poster made it sound *completely* illegal to operate >such an apparatus. > >When are you going to get your distemper shot? |-O Oh, I don't know; my kids think I'm pretty nice, and my office mate sometimes accuses me of being a wuss (though I think he's projecting). When are you going to spend some time learning radio theory and upgrade that embarrassing General class license? ;-) ;-) ;-) I know, I still owe you a book publish in the 1980's; I'll hit Jun's and get the latest Solid State Design for you, though some of the parts in it are already obsolete, it will be better than a 1915 book.... ;-) -- * 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 amsoft@epix.net Mon Aug 21 18:13:02 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: A place to download schemtics/fun electronics projects Date: 20 Aug 1995 15:11:14 GMT Organization: Dover Research Corp. Lines: 10 Message-ID: <417jai$hip$1@mhafm.production.compuserve.com> What format shcematic are you looking for? I have a slug of stuff I've done in Circad format. Course I can output ACAD, Tango, Protel, OrCAD and more with Circad. What do you want and in what format? Lots of my stuff is in the HAMNET area of Compuserve right now if you have access. Go to LIB 6 and search Circad or WB0VNE. 73  -- 73, Jay WB0VNE - AAV5TH From amsoft@epix.net Mon Aug 21 18:13:03 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!elendir From: elendir@enst.fr (Elendir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: An image rejection filter Date: 21 Aug 1995 15:16:00 GMT Organization: ENST - Telecom Paris Lines: 16 Message-ID: <41a7vg$jad@cismsun.univ-lyon1.fr> References: <01HUBX2KKAW200534M@uthscsa.edu> NNTP-Posting-Host: julia.enst.fr X-Newsreader: TIN [version 1.2 PL2] Muenzler, Kevin (MUENZLERK@uthscsa.edu) wrote: : It would be much simpler to build one using the 27.185 crystal and use : the 26.730 for receive. You can cannibalize an old broadcast band receiver : for the 455kHz IF. Be careful if you bring it to the US, homebrew CB is : illegal here. Well, I don't intend to use it as an emitter, just for RX. So I guess that even American law does not prhibit channel 19 receivers ! Ok for buying a 27.185 MHz XTAL. I guess it's the only cheap and reliable solution. Vincent -- F5RCS - Worldwide Friendship through Amateur Radio ENST, Ecole Nationale Superieure des Telecommunications, Paris From amsoft@epix.net Mon Aug 21 18:13:03 1995 Path: grape.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: August QST CMOS Keyer 3 Date: 20 Aug 1995 15:17:42 GMT Organization: Dover Research Corp. Lines: 10 Message-ID: <417jmm$hip$2@mhafm.production.compuserve.com> There are people (like myself) that make a living selling electronic gadgets. In my Article "Weekend DigiVFO" I included the full source code to the project. However, depending on the project I think it is up to the author if he or she wants to spill the beans totaly on a project. The buyers have to decide if they want to buy something that way. If it's ment to be a learning article complete (and understandable) details are important. If it's 2 part Microprocessor Project that took 3 years to code then...... As long as money is involved you have to expect some of that. This is America not a collective. -- 73, Jay WB0VNE - AAV5TH From amsoft@epix.net Mon Aug 21 18:13:04 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!usenet.cis.ufl.edu!usenet.ufl.edu!ppp-25-ts1.nerdc.ufl.edu!user From: poco@nervm.nerdc.ufl.edu (Gary M. Belcaster) Newsgroups: rec.radio.amateur.homebrew Subject: Re: August QST CMOS Keyer 3 Date: Sun, 20 Aug 1995 16:02:37 -0500 Organization: University of Florida Lines: 21 Message-ID: References: <417jmm$hip$2@mhafm.production.compuserve.com> NNTP-Posting-Host: ppp-25-ts1.nerdc.ufl.edu In article <417jmm$hip$2@mhafm.production.compuserve.com>, Jay Craswell <73016.27@CompuServe.COM> wrote: > There are people (like myself) that make a living selling electronic gadgets. > In my Article "Weekend DigiVFO" I included the full source code to the project. > However, depending on the project I think it is up to the author if he or she > wants to spill the beans totaly on a project. The buyers have to decide if > they want to buy something that way. If it's ment to be a learning article > complete (and understandable) details are important. If it's 2 part Microprocessor > Project that took 3 years to code then...... As long as money is involved you > have to expect some of that. This is America not a collective. > -- > 73, Jay WB0VNE - AAV5TH Agreed. Just don't feature it as a construction article which was clearly done (see the cover.) Gary KA9RAO From amsoft@epix.net Mon Aug 21 18:13:05 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.micron.net!news From: bcase@micron.net (Brian Case) Newsgroups: rec.radio.amateur.homebrew Subject: Delcom Tranciever Date: Sat, 19 Aug 1995 17:04:58 GMT Organization: Micron Internet Services Lines: 13 Message-ID: <4151q9$7f3@mis02.micron.net> Reply-To: bcase@micron.net NNTP-Posting-Host: cs003p10.nam.micron.net X-Newsreader: Forte Free Agent 1.0.82 I have a Delcom 960Air Aviation Tranciever that need repaired. Does anyone know where I can find a schematic for this radio, or where to send it to have it repaired. Thanks Brian Please email responses to bcase@micron.net ------------------------------------------------------------ Brian bcase@micron.net ------------------------------------------------------------ From amsoft@epix.net Mon Aug 21 18:13:06 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!bud.shadow.net!news From: Eliot Fenton <72633.3247@compuserve.com> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Divide by ten front end for frequency counter Date: 19 Aug 1995 20:17:17 GMT Organization: Shadow Information Services, Inc. Lines: 7 Message-ID: <415gsd$4l9@bud.shadow.net> References: <40rleh$i0h@pith.uoregon.edu> <40st8u$h1t@nrcnet0.nrc.ca> NNTP-Posting-Host: 204.198.46.40 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit) Motorola has a MECL divide by 10 with TTL outputs that's good to 550 MHz; MC12013. In addition, Newark, Hammond, etc. have enhanced 7216 series counter chips that provide period measurement, etc. It should not be too difficult to build a 3 GHz unit using a divide by four, xtal reference, "mar" front end and a handful of support chips. From amsoft@epix.net Mon Aug 21 18:13:06 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Drake TR7 Date: 20 Aug 1995 15:23:07 GMT Organization: Dover Research Corp. Lines: 6 Message-ID: <417k0r$hip$3@mhafm.production.compuserve.com> I have one as well. If I remember right it's just one cut to open up the radio to full 1.8 to 30MHz. Now as to how to do it? I might have a print someplace. Give me a call on the phone (612) 492-3913 I have it somewhere. OH just call Drake they are still in Biz! -- 73, Jay WB0VNE - AAV5TH From amsoft@epix.net Mon Aug 21 18:13:07 1995 Path: grape.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news From: Jim Strohm Newsgroups: rec.radio.amateur.homebrew Subject: Follow-up: Power Good line on PC PS Date: 21 Aug 1995 15:36:58 GMT Organization: UniSQL, Inc. Lines: 23 Message-ID: <41a96q$4me@unisql.unisql.com> NNTP-Posting-Host: blazer.unisql.com X-Newsreader: NCSA Mosaic Hi all Thanks for the help with the PC power supply. I followed the advice of the first responder, who suggested loading the supply to make it work. I paralleled two 10-ohm, 2-watt resistors and plugged these into the 5-volt rail, and all was well. So if you can use a PC power supply for another project, This makes for a really simple go/no go tester. Filtering the hash from the supply won't be necessary for my application, but should be trivial. And providing decent shielding for the power supply should be do-able with aluminum window screen. When/if I have more updates I'll share them. By the way, junked power supplies are an excellent source of muffin fans, and some power supplies have usable high-voltage filter caps suitable for voltage multiplier HV supplies. The trick lies in getting the kitchen can opener to work on the supply case. Jim N6OTQ standard disclaimer From amsoft@epix.net Mon Aug 21 18:13:08 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!swrinde!sgigate.sgi.com!enews.sgi.com!lll-winken.llnl.gov!fnnews.fnal.gov!nntp-server.caltech.edu!almach.caltech.edu!shoppa From: shoppa@almach.caltech.edu (Timothy D. Shoppa) Newsgroups: rec.radio.amateur.homebrew,rec.crafts.metalworking Subject: Re: How to Space-Wind Coils? Date: 21 Aug 1995 11:24 PST Organization: California Institute of Technology Lines: 27 Distribution: world Message-ID: <21AUG199511243432@almach.caltech.edu> References: <808363044.19680@pinetree.microserve.com> <1995Aug19.031228.21475@nosc.mil> NNTP-Posting-Host: almach.krl.caltech.edu News-Software: VAX/VMS VNEWS 1.41 Xref: grape.epix.net rec.radio.amateur.homebrew:9092 rec.crafts.metalworking:15339 In article <1995Aug19.031228.21475@nosc.mil>, horowitz@nosc.mil (Alan M. Horowitz) writes... >>How about winding on the threads of a bolt or machine screw? It works >>great. Thanks to Ten-Tec for this tip, from their 6-meter transverter >>kit instructions. > > Sounds good. What are the tolerances of garden-variety bolts, with respect > to threads-per-inch and linearity thereof? The worst piece of new 1/4"-20 threaded rod I've ever run across was off by about half a thread over a length of one foot. That would be 1/40th of an inch out of 12 inches, or about 1 part in 500. At the time I did the measurement, I thought this was pretty good for ordinary hardware-store threaded rod; I would expect bolts to be much more precise. In my experience with winding coils, 1 part in 500 in the spacing is *not* something to worry about! When you remove the coil from the bolt, the spacing is likely to change much more than this. The diameter of a bolt (or the depth of the threads) is likely to vary much more than the thread spacing, but still probably wouldn't be all that important compared to the distortion that will happen after the bolt is removed. Tim. (shoppa@altair.krl.caltech.edu) From amsoft@epix.net Mon Aug 21 18:13:08 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!main03!landisj From: landisj@nad.com (Joe Landis - Systems & Network Mgr) Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Info on X band TWT??? Message-ID: <1995Aug18.230234.346@nad.com> Date: 18 Aug 95 23:02:33 EST Distribution: world Organization: North American Drager - Telford, PA Lines: 10 Xref: grape.epix.net rec.radio.amateur.homebrew:9055 rec.radio.swap:41793 Hi, I came across a Teledyne/MEC M5842-A TWT. Based on the WR90 output flange, it looks like it may be usable on 10Ghz. Anybody have any info on it, data sheet, or a contact to the mfr? Thanks, Joe - AA3GN -- Joe Landis - Systems and Network Manager - North American Drager - Telford, PA landisj@nad.com ..speaking only for mysel From amsoft@epix.net Mon Aug 21 18:13:10 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: hamrlund@aol.com (HAM R LUND) Newsgroups: rec.radio.amateur.homebrew Subject: Items forsale Date: 20 Aug 1995 17:33:12 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 139 Sender: root@newsbf02.news.aol.com Message-ID: <4189mo$on0@newsbf02.news.aol.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader ********************************************************* ********************************************************* CONTACT: Robert Fowle.......Hamrlund@aol.com Ph.517-789-6721............................................... 1215 Winifred....Jackson, Mich. 49202-1946 | | ---|---|---> the Hammarlund guy | | ********************************************************* ********************************************************* the following is a list of items for sale All pricing includes shipping.................. REVISED: 8-4-95-PM PARTS***************************************************** Of course Hammarlund, if you need something let me know...to much to list, NOT even Andrew wanted to take the list... : > ))) ****** air variables have the following for sale, capacity listed where known. most have no boxes, all are poly-bagged. will sell by the piece or trade all for Hammarlund equipment, manuals, accessories, literature, ect. If no price is listed...it is $10.00 each qty.- part# - capacity (if known) Hammarlund: 1/ 34604-5 1/ 34604-6 1/ 351-1059 1/ 4111-49 1/ 48A084 1/ 5003-C C1C 1/ 9404-18-00040 2/ 9411-72-50379 2/ 9411-72-60348 1/ 11727-77 1/ A8H501 1/ APC 25 3.0-25. 4/ ASP 100 G $13.00 ea 1/ APC 100 5.5-100 $13.00 ea 5/ APC 140 6.7-140 $13.00 ea 1/ B-253-124-2 1/ B-7485-440-2 1/ C 67380 3/ CT 1E040 5.0-40 1/ CT 1E075 6.0-75. 1/ CT 1F040 5.0-40. 1/ CT 3C040 1/ CT 14E042-M 5.0-42 1/ CT 14E042-J 3.0-10. 1/ CT 14F010-J 3.0-10. 1/ CT 14F042-J 5.0-42 1/ CT 1316047-J 5.5-47. 2/ ES 676693-5 2/ KS-13772 3/ KS-13998L1 1/ KS 18998L14 1/ MACBF-3 1.3-3.1 N.I.B. 1/ MAC-5 N.I.B. 1/ HF-15-X N.I.B. 1/ HF-50 N.I.B. 1/ MAC-20 2.0-21.5 2/ MABF-8 2.0-7.9 1/ MAPC-100 4.5-100. $13.00 1/ MCD-35 MX 6.0-31. $15.00 1/ MJ-50-5 1/ P-31800014 1/ P-7761345-15 1/ 34452-40 4/ 841690 1/ 7765659-1 $25.00 CARDWELL 2/ A-105623 25MuFD $18.00 ea 3/ ZU-100-AS 3.0-100. $15.00 ea B&W 1/ CX-62-C : This is the cap used with the KW plug-in coils $75.00 new no box BUD 1/ 1615 AIR GAP-300 75MMFD $65.00 new no box EFJ 1/ ? DUAL SECTION 14 3/4" L x 5.50" W 1/8" spacing (approx. measurments) $95.00 1/ 48c075 air gap .175 dual sec., 9.75" L x 4" W $65.00 1/ ? 5.75" L x 4" W single sec. 1/8 " spacing $55.00 1/ 4134MS4 edge wound 41 uh $75.00 ******* BOOKS & MANUALS ********************** HAMMARLUND MANUAL SALE ****************************** I have a limited number of new manuals i got when i purchased the inventory of Wayne Cordell..... These are unused originals. some may have a fade area on the cover from storage before I got them, yet others look almost as they did 35+ years ago. these are new unused and in unread condition. Here's whats available: HQ-100.........................$23.00 ea HQ-145-A......................$23.00 ea HXL ONE AMP..............$23.00 ea HX 50............................$23.00 ea HX-500..........................$23.00 ea Get them while they last. I have never made them available in such away before. This is a unique oppertunity...... SUPPLIES ARE LIMITED.....FIRST COME FIRST SERVE........... THE FOLLOWING WILL BE 'COPIES'. Prices are shipped. HAMMARLUND Comet Pro 2nd Edition 20.00 Comet Pro manual 3 AVCModel 20.00 Four 20 xmitter & four 11 modulator 20.00 RGB CHC 46140 / CHC 49154 (120X) 20.00 HQ-100 18.00 HQ-100A 18.00 HQ-105TR / TRS 18.00 HQ-110 18.00 HQ-110A 18.00 HQ-120X 18. From amsoft@epix.net Mon Aug 21 18:13:10 1995 From: KF8QU@msn.com (Bob Tournoux) Subject: Re: July QEX Date: 20 Aug 95 18:49:14 -0700 References: <406q2m$iof@apakabar.cc.columbia.edu> <40957e$l3q@news.azstarnet.com> Message-ID: <00001fee+000007e2@msn.com> Path: grape.epix.net!news.sprintlink.net!news.msn.com!msn.com Newsgroups: rec.radio.amateur.homebrew Organization: The Microsoft Network (MSN) Lines: 5 Got mine... but its now August 20, 1995 -- so hope you got yours too! Bob 73 KF8QU From amsoft@epix.net Mon Aug 21 18:13:11 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!not-for-mail From: MUENZLERK@uthscsa.edu (Muenzler, Kevin) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.policy,rec.radio.amateur.space Subject: Mail Failure - Apology Date: 18 Aug 1995 15:25:35 -0500 Organization: UTexas Mail-to-News Gateway Lines: 5 Sender: nobody@cs.utexas.edu Message-ID: <01HU81X7EAAA004FRS@uthscsa.edu> NNTP-Posting-Host: news.cs.utexas.edu Xref: grape.epix.net rec.radio.amateur.antenna:13097 rec.radio.amateur.equipment:16026 rec.radio.amateur.homebrew:9052 rec.radio.amateur.policy:29041 rec.radio.amateur.space:4627 My apologies to the list(s). We had a system failure on our end. It has been corrected. Kevin, WB5RUE muenzlerk@uthscsa.edu From amsoft@epix.net Mon Aug 21 18:13:11 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews From: aglass@ix.netcom.com (Andrew Glass) Newsgroups: rec.radio.amateur.homebrew Subject: Need B-Scan Scope Tube Date: Sat, 19 Aug 1995 01:30:52 GMT Organization: Netcom Lines: 4 Distribution: world Message-ID: <413b7t$7mc@ixnews4.ix.netcom.com> NNTP-Posting-Host: ix-tf1-22.ix.netcom.com X-Newsreader: Forte Agent .99.82 I am looking for a source for a B-Scan S159P1 Scope tube. It is 3" round and goes in an old O.A.R. direction finding unit. Any leads you could give me would be appreciated... 73 Andy WD4MYL From amsoft@epix.net Mon Aug 21 18:13:12 1995 Path: grape.epix.net!news.sprintlink.net!simtel!swidir.switch.ch!scsing.switch.ch!news.belwue.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need help modifying older handheld for 2M Date: 21 Aug 1995 09:59:45 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 20 Message-ID: <419leh$17e6@info4.rus.uni-stuttgart.de> References: NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de In article , Kendel McCarley wrote: >Changing the crystals seems rather trivial, but I don't know what I need >to do to tune the rest of the radio for two meter use. I don't have any >schematics for these radios. Kendel, *changing* the crystals might be trivial, but nowdays you might find it difficult to obtain the needed crystals at a price substantially less than a s/h 2m HT. If you can find the frequencies of the crystals employed you may be able to work out the frequency for your desired channels. the rest is fairly easy, even without schematics: Locate the TX and RX multiplier chains, tweak them up with a diode RF probe (You may have to check if you are on the right overtone) tweak the RX input and PA, and off you go. 73, Moritz DL5UH From amsoft@epix.net Mon Aug 21 18:13:13 1995 Path: grape.epix.net!news.sprintlink.net!gatech!ncar!noao!CS.Arizona.EDU!news.Arizona.EDU!usenet From: Kendel McCarley Newsgroups: rec.radio.amateur.homebrew Subject: Need help modifying older handheld for 2M Date: Fri, 18 Aug 1995 18:44:51 -0700 (MST) Organization: The University of Arizona Lines: 22 Message-ID: NNTP-Posting-Host: stat.nursing.arizona.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII I picked up a box of older, crystal-controlled 150 MHz band FM transceivers that were headed for the trash can after the owner denuded them of antennaes. They will all operate on two channels and have seperate crystals for send and receive. The two models that I have several of seem to have remarkable similar circuitry (same Motorola parts, similar layout, etc.). Yes, they all seem to work for their current frequencies. Changing the crystals seems rather trivial, but I don't know what I need to do to tune the rest of the radio for two meter use. I don't have any schematics for these radios. Does somebody have any pointers to schematics or (better yet) advice on how to use these on two meters. I've had my license for over a year and, being a poor grad student, would just love to finally get on the air for the cost of a little time. The radios are: Regency UC102 and Fujitsu Ten Limited FTP15-292L Thanks, Kendel McCarley kendelm@ece.arizona.edu KC7FRS http://www.nursing.arizona.edu/~kendelm From amsoft@epix.net Mon Aug 21 18:13:14 1995 Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news1.halcyon.com!coho.halcyon.com!mcraw From: Marshall Craw Newsgroups: rec.radio.swap,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: NEW HAM RADIO REMOTE CONTROL PRODUCT OFFERED Date: Fri, 18 Aug 1995 22:19:38 -0700 Organization: Northwest Nexus Inc. Lines: 29 Message-ID: References: NNTP-Posting-Host: coho.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Xref: grape.epix.net rec.radio.swap:41907 rec.radio.amateur.equipment:16084 rec.radio.amateur.homebrew:9093 rec.radio.amateur.digital.misc:10135 I am pleased to announce a new product offered by Positive Time Systems called the RCS-I. This is a radio controller that connects to any VHF/UHF transceiver and can issue x-10 commands. (X-10 is a power line standard for controlling devices throughout a building. Sears, Radio Shack, and others offer these compatible units) The unit also has an alarm input, a listen feature, a short voicmail box, and responds to all commands in a pleasant female voice. The system IDs with your recorded voice and call sign. This description doesn't do the product justice, so please check out the new homepage at : http://www.halcyon.com/pos.time.sys/top or you may email us with you address so that we can promptly send you our brochure and newsletter. NOTE: This product is intended for US voltages of 120 / 220 VAC. Another version is offered to support other international power standards. FLASH! NEW FEATURE! The RCS-I has a new feature called Secure Access Mode(SAM). When enabled, the access code changes dozens of times per hour, making it virtually impossible to hack into. Thank You, Marshall Craw Positive Time Systems North Bend, WA From amsoft@epix.net Mon Aug 21 18:13:15 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!mv!wd1v.mv.com!user From: john@wd1v.mv.com (John Seney) Subject: New Mac Ham Radio Test Simulators Message-ID: Nntp-Posting-Host: wd1v.mv.com Sender: usenet@mv.mv.com (System Administrator) Organization: MV Communications, Inc. Date: Mon, 21 Aug 1995 10:32:42 GMT Lines: 62 The new Macintosh Ham Test Simulators are HERE! Novice Ham Test 5.0 SA.sea Technician Ham Test 5.0 SA.sea General Ham Test 5.0 SA.sea Advanced Ham Test 5.0 SA.sea Extra Ham Test 5.0 SA.sea The latest versions feature: HyperCard 2.3 as a stand-alone application (SA) eliminating the need to have HyperCard. All you need is a Mac with 4 Meg of memory and version System 7 or greater. Each version 5 Ham Test Simulator has the latest questions as prepared by the Question Pool Committee. Each Ham Test Simulator is FREE OF CHARGE and work the same way as the originals written by Diana, KC1SP. You may obtain a Ham Test Simulator by mailing me a *FORMATTED disk (1 per test) and include a Self Addressed and Stamped disk mailer for the return. Each Ham Test Simulator is also bundled with a shareware CW program called MacMorse 1.4 written by Doug, WB0EON. Also included are a collection of text files that relate an interesting variety of ideas about the best way to study CW and prepare for tests. or warm your phone line and get just the tests: America On Line - Macintosh Ham Radio Section ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/AdvancedHamTest1.sea.bin ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/ExtraHamTest.sea.bin ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/GeneralHamTest.sea.bin ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/NoviceHamTest.sea.bin ftp://oak.oakland.edu//pub3/hamradio/mac/theory-and-morse/TechnicianHamTest.sea.bin Your comments and suggestions for future versions are always welcome. Stay in touch and good luck with your next test! 73, \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/ John D. Seney, WD1V Internet: john@wd1v.mv.com 144 Pepperidge Drive America On Line: jseney@aol.com Manchester, NH 03103-6150 AX.25 Pkt: wd1v@wb1dsw.nh.usa.na (H) 603-668-1096 Ampernet: wd1v@wd1v.ampr.org \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/ LeCroy Sales Engineering - Maine, New Hampshire, and Northeastern Massachusetts (O) 800-553-2769 (F) 603-627-1623 (P) 800-SKYPAGE #5956779 All opinions are my own, including Digital Storage Scope.FAQ To obtain the latest copy automatically, simply send me an EMAIL with "subscribe scope.faq" in the subject field. \/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/ From amsoft@epix.net Mon Aug 21 18:13:16 1995 Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!in2.uu.net!iglou!dp013 From: csakkas@iglou.com (Chris Sakkas) Subject: New Web site for Amateur Radio X-Nntp-Posting-Host: dp013.ppp.iglou.com Message-ID: Sender: news@iglou.com (News Administrator) Organization: IgLou Internet Services X-Newsreader: News Xpress Version 1.0 Beta #4 Date: Fri, 18 Aug 1995 14:25:28 GMT Lines: 24 Xref: grape.epix.net rec.radio.amateur.misc:85181 rec.radio.amateur.homebrew:9049 We've recently added an Amateur Radio page to our web site! Our web address is: http://www.iglou.com/ITU and our anonymous ftp address is: ftp://iglou.com/members/ITU We also have some files on PC-interfacing and general electronics-related material available on our ftp site. We would appreciate any comments and suggestions, especially additions or corrections to links on our page. Please keep in mind that we have just added this page and will continue to make updates! Thanks! Chris ---------------------------------------------------------------------- Chris B. Sakkas (csakkas@iglou.com) http://www.iglou.com/ITU ITU Technologies (ITUTec@aol.com) ftp://iglou.com/members/ITU Complete PIC programming packages starting at only $29! See our web page or e-mail us today for more info! From amsoft@epix.net Mon Aug 21 18:13:17 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!in1.uu.net!tadpole.com!tivoli.tivoli.com!usenet From: Tim Deagan Newsgroups: rec.radio.amateur.homebrew Subject: OScope for VHF/UHF VSWR? Date: 18 Aug 1995 18:19:33 GMT Organization: thInk AgAIn services Lines: 26 Message-ID: <412ljl$kr4@tivoli.tivoli.com> NNTP-Posting-Host: tivoli.tivoli.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 32bit) I just got my tech class ticket and am starting to put my shack together. I don't have much radio gear (yet ;-) but I do have a lot of electronics gear. I have OScopes at 35MHz, 50MHz and 75MHz. I would love to put these to use in my shack. Can someone point me at articles that would help me in getting the most out of these for use in HAM activity (I'm a digital guy, I've only used them for monitoring trigger conditions, etc.)? I would specifically like to put off purchasing a VSWR meter for a little while (until my the cost of a new HT wears off :-) Advice in mail or news is also appreciated! 73 --Tim, KC5QFG -- ,----, <> ReVTiM <> .----. { <> /-------------------\ KC5QFG /---------------------\ <> } `--( tim@thinkagain.com http://www.fc.net/~tdeagan )--' `--------------------------------------------------' From amsoft@epix.net Mon Aug 21 18:13:17 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!news.dfn.de!news.belwue.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.homebrew Subject: Re: OScope for VHF/UHF VSWR? Date: 21 Aug 1995 09:50:51 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 13 Message-ID: <419ktr$oec@info4.rus.uni-stuttgart.de> References: <412ljl$kr4@tivoli.tivoli.com> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de In article <412ljl$kr4@tivoli.tivoli.com>, Tim Deagan wrote: >I would specifically like to put off purchasing a VSWR meter >for a little while (until my the cost of a new HT wears off :-) Hi Tim, Sorry to say so, but oscilloscopes are about as usefull for measuring swr as are CD players. If cash is an issue, consider building a SWR meter, or sell your hand held to buy some decent equipment. 73, Moritz DL5UH From amsoft@epix.net Mon Aug 21 18:13:18 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!in2.uu.net!iglou!dp072 From: csakkas@iglou.com (Chris Sakkas) Subject: Re: Pcb & iron-on transfer X-Nntp-Posting-Host: dp072.ppp.iglou.com Message-ID: Sender: news@iglou.com (News Administrator) Organization: IgLou Internet Services X-Newsreader: News Xpress Version 1.0 Beta #4 References: <808614707.AA03258@hamlink.mn.org> Date: Sat, 19 Aug 1995 16:50:03 GMT Lines: 30 In article , Garry Foster wrote: >There is a very complete article on this in this months issue of "Nuts >and Volts". The author is sold on it but has went to some expense in >setting up. There have been some good discussions on this is >sci.electronics over the past few months. Many swear by it and some swear >at it. I have no experance but from what I have read would give it a try >if I had a laser printer. > > Garry > >PS >I've found many reluctent to allow anyon eto stick strange stuff in thier >printers/copiers. I've had _very_ good results using Techniks' Press-n-Peel Blue sheets. Some experimentation is required to find the appropriate ironing temperature, and you must allow the board to cool completely before removing the sheet. I've made many single and double sided prototypes this way with great results! I'm using a laserjet 4P printer, if that makes any difference. Good luck, Chris ---------------------------------------------------------------------- Chris B. Sakkas (csakkas@iglou.com) http://www.iglou.com/ITU ITU Technologies (ITUTec@aol.com) ftp://iglou.com/members/ITU Complete PIC programming packages starting at only $29! See our web page or e-mail us today for more info! From amsoft@epix.net Mon Aug 21 18:13:19 1995 Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!howland.reston.ans.net!nntp.crl.com!crl14.crl.com!not-for-mail From: frbspd@crl.com (Stephen Dunifer) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Pcb & iron-on transfer Date: 20 Aug 1995 15:12:08 -0700 Organization: CRL Dialup Internet Access (415) 705-6060 [Login: guest] Lines: 17 Message-ID: <418bvo$45m@crl14.crl.com> References: <808614707.AA03258@hamlink.mn.org> NNTP-Posting-Host: crl14.crl.com X-Newsreader: TIN [version 1.2 PL2] I am not sure why everyone is stuck on the iron-on transfers. I have tried this with limited results. Instead, we just have the circuit board house we work with laminate the positive working film they use to a blank panel. Then in a dark room, I just cut off the size needed for a prototype. Just run your pattern on overhead film for the positive and expose the board with a UV rich light source (sun lamp). Develop in sodium carbonate (one cup per 15 gallons of H2O), rinse and then etch. This is far cheaper than what is charged for the film and produces much better and consistent results. Most areas have circuit board shops that will probably be willing to do this. It seems someone could really do the home shop market a service by just buying a laminator and supplying via mail order panels already to go. We are busy enough but a retired amateur could certainly augment his or her income in this manner. Stephen Dunifer From amsoft@epix.net Mon Aug 21 18:13:20 1995 Path: grape.epix.net!news.sprintlink.net!news.primenet.com!news.primenet.com!ip160.msp.primenet.com!user From: ddonald@primenet.com (David Donaldson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Pcb & iron-on transfer Date: Mon, 21 Aug 1995 09:54:45 -0600 Organization: Primenet Lines: 6 Message-ID: References: <808614707.AA03258@hamlink.mn.org> <418bvo$45m@crl14.crl.com> NNTP-Posting-Host: ip160.msp.primenet.com I have found overhead transparencies and a copy machine work well. The toner is consistant and the lines are crisp. I could never get the paper method to work. Could not get the pressure proper. Be carefull with the transparencies though, they will melt to heated to hot. Dave, WB7dru From amsoft@epix.net Mon Aug 21 18:13:20 1995 Newsgroups: rec.radio.amateur.homebrew Subject: Phone Line Status Indicat From: clint.bradford@woodybbs.com (Clint Bradford) Path: grape.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!wwswinc!clint.bradford Distribution: world Message-ID: <93.1455.7584.0NFBADF0@woodybbs.com> Date: Wed, 16 Aug 95 23:56:00 -0500 Organization: WoodyWare Software, Inc. - 516-736-6662 Lines: 10 Subject: Phone Line Status Indicator >>I'm looking for a circuit that I can add to a phone/phone line to show >>if the line is in use. Radio Shack carries such an item. . .uses a 9-Volt battery - which lasts over a year. I installed mine on the kitchen phone, so my family would know if I was on the modem in the office.... --- þ wcECHO 4.1 ÷ AR-Net: ATTENTION to Details þ Mira Loma, CA þ 909-681-6221 From amsoft@epix.net Mon Aug 21 18:13:21 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Pin Diodes Date: 19 Aug 1995 03:59:41 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 18 Sender: root@newsbf02.news.aol.com Message-ID: <4145ld$n1m@newsbf02.news.aol.com> References: <413vc1$277@hpscit.sc.hp.com> Reply-To: w8jitom@aol.com (W8JI Tom) NNTP-Posting-Host: newsbf02.mail.aol.com >>Try building a half wave rectifier with it. A PIN diode won't >>rectify very well. >>N6RK Add to that....at higher frequencies. They work fine at low frequencies and depending on doping they have about the same forward drop as a conventional rectifier at dc. The best way to tell is to look up the number in a listing or contact the manufacturer. Any test would have to be exhaustive and involve testing at the operating frequency range of the diodes. Some PIN diodes work as PIN's at fairly low frequencies (like 1.8 or 3.5 MHz), but most do not behave like PIN diodes until mid HF, upper HF, or VHF is reached. The voltage drop is no way to tell, and neither is LF or any dc parameters. 73 Tom From amsoft@epix.net Mon Aug 21 18:13:21 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.uoregon.edu!sanjuan.amtsgi.bc.ca!salmon!clinton.peebles From: clinton.peebles@saloon.bcbbs.net (Clinton Peebles) Newsgroups: rec.radio.amateur.homebrew Subject: Ramsey LPA-1 amp. Date: Sun, 20 Aug 1995 13:59:42 GMT Message-ID: <9508200701273065@saloon.bcbbs.net> Organization: Salmon Siding Saloon BBS 604-357-9942 Distribution: world Lines: 6 Does anyone have the schematics for Ramsey's PA-1 2 meter amp? If so can I please have a copy? E-mail me and I'll e-mail my fax number if you wish, or my snail mail address, or if you have a scanner, e-mail me a GIF. My E-Mail address is clinton.peebles@saloon.bcbbs.net Thanks. Clinton VE7KNL From amsoft@epix.net Mon Aug 21 18:13:22 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!in2.uu.net!pipeline!psinntp!psinntp!psinntp!voder!nsc!news From: "Al Koblinski (W7XA)" Subject: Re: RF TRANSISTORS?? Content-Type: text/plain; charset=us-ascii Message-ID: Sender: news@nsc.nsc.com (netnews maintenance) Nntp-Posting-Host: akoblinski.nsc.com Content-Transfer-Encoding: 7bit Organization: National Semiconductor, Santa Clara References: <40vt2k$njf@kodak.rdcs.Kodak.COM> Mime-Version: 1.0 Date: Fri, 18 Aug 1995 23:03:52 GMT X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:40vt2k$njf@kodak.rdcs.Kodak.COM Lines: 11 Several places. Richardson Electronics, Penstock, Allied Radio, Newark Electronics, etc. They all use the same price lists and for small quantities they will all be about the same price. Ham or electronic Flea markets or surplus dealers are another possibility but may not have what you want and may be more trouble than the money you save. Unfortunately there are not many manufacturers and thus not much competition, especially in very small quantities. From amsoft@epix.net Mon Aug 21 18:13:23 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!news.dtc.hp.com!hpscit.sc.hp.com!icon!greg From: greg@core.rose.hp.com (Greg Dolkas) Subject: Re: TNC plans needed Sender: news@icon.rose.hp.com (News Administrator) Message-ID: Date: Fri, 18 Aug 1995 23:03:22 GMT References: <40vjp1$329e@info4.rus.uni-stuttgart.de> Organization: HP - Information Networks Division X-Newsreader: TIN [version 1.1.8 PL6] Lines: 8 (moritz@ipers1.e-technik.uni-stuttgart.de) wrote: : begin 644 btnc.gif : M1TE&.#=AZ`/N`K,``/___P``````_^#@__\```#_`/___P```/___P`````` : M_^#@__\```#_`/___P```"P`````Z`/N`@`$_Q#(2:N]..O-N_]@*(YD:9YH Neat schematic... Where does one get the TCM3105 chip? Software? Greg KO6TH From amsoft@epix.net Mon Aug 21 18:13:23 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: TNC plans needed Date: Sat, 19 Aug 95 00:02:19 GMT Organization: TSE Systems Lines: 30 Message-ID: <4139oe$e34@solaris.cc.vt.edu> References: <40vjp1$329e@info4.rus.uni-stuttgart.de> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 In article , greg@core.rose.hp.com (Greg Dolkas) wrote: > (moritz@ipers1.e-technik.uni-stuttgart.de) wrote: >: begin 644 btnc.gif >: M1TE&.#=AZ`/N`K,``/___P``````_^#@__\```#_`/___P```/___P`````` >: M_^#@__\```#_`/___P```"P`````Z`/N`@`$_Q#(2:N]..O-N_]@*(YD:9YH > >Neat schematic... Where does one get the TCM3105 chip? Software? > >Greg KO6TH TCM3105's are still made, probably solely for the ham market. Newark, JDR, and Jameco would be good US places to check, as well as any full-line TI distributor. I don't think anyone other than Texas Instruments made them. I didn't look at the schematic, make sure there is a provision for adjusting the bias level on Pin 7 as this is critical for good reception. Sometimes the design is cheapened by using 2 fixed resistors rather than a pot there and this may not work well with some 3105's. As for software, download Baycom 1.5 from your choice of a large number of ftp archives. This is good entry-level end-user AX.25 terminal software. Various other software drivers for other applications are also available. The Baycom group also maintains a Web page at http://www.baycom.de. -Mike KD4QDM From amsoft@epix.net Mon Aug 21 18:13:24 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!gatech!psinntp!psinntp!psinntp!psinntp!voder!nsc!news From: "Al Koblinski (W7XA)" Subject: Re: Trouble with MRF141G - 300 watt amp Content-Type: text/plain; charset=us-ascii Message-ID: Sender: news@nsc.nsc.com (netnews maintenance) Nntp-Posting-Host: akoblinski.nsc.com Content-Transfer-Encoding: 7bit Organization: National Semiconductor, Santa Clara References: Mime-Version: 1.0 Date: Fri, 18 Aug 1995 22:58:41 GMT X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:pff.15.000D283B@bfs.uwm.edu Lines: 16 Sounds like the gate has somehow been shorted to the drain. The device has thousands of gates (and transistors) in parallel and if a few of the gates get shorted to the drain due to ESD, the condition you see will exist. You could (carefully) check with an ohmmeter between gate to drain or source and if there is any resistance value less than infinite, you may have killed the part. Despite the fact it is a 'power transistor', MOSFETS are ESD sensitive and can be all too easily damaged. If you cannot measure any reisistance less than infinity on the highest range, try a putting a few (<5) volts negative on the gate and see if the current will diminish. It's very rare but sometimes a contamination can shift the threshold down. I think the device is woulded. Sorry. 73, Al From amsoft@epix.net Mon Aug 21 18:13:25 1995 Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!univ-lyon1.fr!elendir From: elendir@enst.fr (Elendir) Newsgroups: rec.radio.amateur.homebrew Subject: VCO noise, again - with a PLL Date: 20 Aug 1995 10:18:30 GMT Organization: ENST - Telecom Paris Lines: 16 Message-ID: <41725m$h8t@cismsun.univ-lyon1.fr> NNTP-Posting-Host: julia.enst.fr X-Newsreader: TIN [version 1.2 PL2] Hi everybody, I'm back with that VCO noise problem. This time, however, I'd like to know how much can a PLL with, let's say a reference of F Hz, reduce a VCO noise under F. Does anybody have any clue ? And then, is there a special way to design the loop filter in order to improve the noise figure while keeping all other parameters (lock time, sideband suppression) acceptable ? Thanks, Vince -- F5RCS - Worldwide Friendship through Amateur Radio ENST, Ecole Nationale Superieure des Telecommunications, Paris From amsoft@epix.net Mon Aug 21 18:13:26 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!bud.shadow.net!news From: Eliot Fenton <72633.3247@compuserve.com> Newsgroups: rec.radio.amateur.homebrew Subject: Re: VCO noise, again - with a PLL Date: 21 Aug 1995 14:16:02 GMT Organization: ICS Inc. Lines: 41 Message-ID: <41a4f2$ue1@bud.shadow.net> References: <41725m$h8t@cismsun.univ-lyon1.fr> NNTP-Posting-Host: 204.198.46.30 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit) To: elendir@enst.fr Vince.............. I came into your discussion late, however it appears you are asking about phase noise with regards to VCO's and loop filters. In a nutshell: Phase noise is related to reference noise, vco noise, divider noise, VCC noise, etc.. The output noise of the VCO within the 3 db bandwidth of the loop filter is approximately (and I use that term "very loosely) equal to 20logN times the phase noise of the reference oscillator, where N is the division ratio. For example, if your reference oscillator is 1 MHz with a phase noise of -150 dBc at 10 KHz, and your 300 MHz VCO is phase locked to it, then your 300 MHz phase noise at 10 KHz offset would be 20log(300MHz/1MHz) + (-150 dBc) = -100.5 dBc. Essentially, the phase noise of the reference is "multiplied up" by the division ratio. The Phase noise limit for CMOS dividers is approx. -150 dBc; for ECL approx. -130 dbc. This should give you an idea of the ultimate phase noise floor you will achieve with various components. As far as your question regarding sideband suppression and noise, these are all tradeoffs which the designer has to contend with. When designing low noise units, it's customary to use different phase detectors for different applications. A sample and hold is good for low noise, but not for acquisition or switching speed. Conversely, the tri-state detector is good for speed and acquistion, but only mediocre as far as noise is concerned. Obviously, there is a great deal of information that you will have to digest to understand the subject completely, certainly much more than I can explain here. I suggest starting with a book by Floyd Gardner, PLL techniques (I think that's the name, but don't quote me) which is a classic in the industry. Keep me posted on your progress. Incidentally, my company specializes in VCO and synthesizer design, so if you run into any problems, one of our engineers is sure to have an answer, or at the very least steer you in the right direction. Best Regards, Eliot Fenton ICS From amsoft@epix.net Mon Aug 21 18:13:26 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!esol.intermedia.com!news From: geotek@cent.com Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.antenna Subject: Wanted: Old Test Equip. Catalogs Date: Mon, 21 Aug 95 08:43:09 PDT Organization: (None) Lines: 7 Message-ID: NNTP-Posting-Host: 204.149.224.16 Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage Xref: grape.epix.net rec.radio.amateur.misc:85271 rec.radio.amateur.homebrew:9087 rec.radio.amateur.antenna:13168 I would like to purchase old test catalogs for my library. I am interested in catalogs and data sheets from the 50's through the mid 70's. If you have any H.P., Tektronix, General Radio, Wavetek, Boonton Radio, or similar catalogs please contact George Carlson at Email geotek@cent.com or telephone office-(713)376-4606, home-(713)376-8307 From amsoft@epix.net Mon Aug 21 18:13:27 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!gatech!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Where can I find plans for a spark gap transmitter? Message-ID: <1995Aug19.143730.12189@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4105og$ev3@ixnews4.ix.netcom.com> <410efh$9ln@news.azstarnet.com> <410u0p$qk6@usenet1.interramp.com> Date: Sat, 19 Aug 1995 14:37:30 GMT Lines: 17 In article <410u0p$qk6@usenet1.interramp.com> Grant H Youngman writes: >GOOD GRIEF GUYS!!! Is everyone on USenet a JERK?? If you don't have the >plans he has been asking for then just shut up, hit the frigging delete >key and move on to the next message. > >This is totally uncalled for, boorish, and JUST PLAIN RUDE. > >Grant/NQ5T Yes, you are. 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 amsoft@epix.net Mon Aug 21 18:13:28 1995 Path: grape.epix.net!news.sprintlink.net!news.azstarnet.com!usenet From: Wes Stewart Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: 18 Aug 1995 22:15:09 GMT Organization: Arizona Daily Star - AZSTARNET Lines: 31 Message-ID: <4133dd$3rl@news.azstarnet.com> References: <4105og$ev3@ixnews4.ix.netcom.com> <410efh$9ln@news.azstarnet.com> <410u0p$qk6@usenet1.interramp.com> NNTP-Posting-Host: sprite126.azstarnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b2 (Windows; I; 16bit) Grant H Youngman wrote: >Wes Stewart wrote: >>au@ix.netcom.com (Einstein ) wrote: [snip] >GOOD GRIEF GUYS!!! Is everyone on USenet a JERK?? No, just some of you:) > If you don't have the >plans he has been asking for then just shut up, hit the frigging delete >key and move on to the next message. > >This is totally uncalled for, boorish, and JUST PLAIN RUDE. In your not so humble redundant opinion. (Are you a lawyer BTW?) Perhaps this medium isn't the best way to offer what was intended to be constructive advice. The point most of us (I think) were trying to make is that careless operation of this thing could be a problem. I obviously don't know George and HE certainly hasn't given me reason to be insulting. If you read this group often, you will note many questions which are coming from inexperienced individuals (not I said inexperienced, not stupid) who are attempting to do something inappropriate. Perhaps it's my "Elmer" nature of wanting to help, getting me in trouble with you. Frankly, it doesn't matter. I really doubt that the intention was to use four foot diameter coils and operate in a Faraday cage. When the man says "I know it's illegal but... I want to do it anyway", what does it say to you? I was and am trying to dissuade George from radiating a signal with this device. SK From amsoft@epix.net Mon Aug 21 18:13:29 1995 Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: Fri, 18 Aug 95 23:54:06 GMT Organization: TSE Systems Lines: 41 Message-ID: <413990$e34@solaris.cc.vt.edu> References: <4105og$ev3@ixnews4.ix.netcom.com> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 In article <4105og$ev3@ixnews4.ix.netcom.com>, au@ix.netcom.com (Einstein ) wrote: >I looking for old plans for a spark gap transmitter. If you have any >I'd be happy to pay for copying them. > >PLEASE no flames! I know that they are illegal to use. This is for a >science project and will not be used on amateur or commerical bands. > >George N7BUI > and then the readers of rec.radio.amateur.homebrew (with a few exceptions) responded with a barrage of flames. On first glance, three things about the post suggest it is worthy of flaming: * Use of a handle ("Einstein") rather than a real name. However, on closer inspection, a real (first) name and ham callsign are given. N7BUI has been issued to an Oregon resident named George. It is of course hard to prove that he is the actual writer of the post. * Explanation that the intention was a "science project". Many times this is used to conceal actual intentions. However, I would consider a spark gap transmitter (unlike a "K3Wl BoMb") an interesting piece of scientific history that would make a good science project. Many sets of plans for the various types of spark gap transmitters are likely to be old and of historical interest as well. * "I know they are illegal to use," but... Come on guys, it is obvious they are illegal to use. It would most likely only be used for a brief short-range (limited power, no antenna) demonstration, if at all. If one is even built. A study of the various designs and an interpretive presentation of the advances in this technology would be a credible science project, without actually building a working transmitter. If he wanted a practical radio transmitter or jamming device, one using more modern technology would be much more suitable. Since I'm not familiar with spark transmitter technology (although I'm now at least a little informed after reading Tom's and some of the other responses), I can't directly answer George's request. But I did want to comment on the knee-jerk negative reactions I saw from many. -Mike KD4QDM From amsoft@epix.net Mon Aug 21 18:13:30 1995 Path: grape.epix.net!news.sprintlink.net!gatech!newsfeed.pitt.edu!dbisna.com!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet From: Grant H Youngman Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: 20 Aug 1995 14:18:54 GMT Organization: PSI Public Usenet Link Lines: 24 Message-ID: <417g8e$1id@usenet1.interramp.com> References: <4105og$ev3@ixnews4.ix.netcom.com> <410efh$9ln@news.azstarnet.com> <410u0p$qk6@usenet1.interramp.com> <1995Aug19.143730.12189@ke4zv.atl.ga.us> NNTP-Posting-Host: ip11.ft.worth.tx.interramp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit) To: gary@ke4zv.atl.ga.us gary@ke4zv.atl.ga.us (Gary Coffman) wrote: >In article <410u0p$qk6@usenet1.interramp.com> Grant H Youngman writes: >>GOOD GRIEF GUYS!!! Is everyone on USenet a JERK?? If you don't have the >>plans he has been asking for then just shut up, hit the frigging delete >>key and move on to the next message. >> >>This is totally uncalled for, boorish, and JUST PLAIN RUDE. >> >>Grant/NQ5T > >Yes, you are. > > I'm just doing my gol' darndest to keep up with everyone else around here...... It someone else can be rude, well, I'll show 'em -- I can be as rude as the next guy. Grant/NQ5T Enough, already From amsoft@epix.net Mon Aug 21 18:13:30 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!interramp.com!usenet From: Grant H Youngman Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: 20 Aug 1995 14:10:04 GMT Organization: PSI Public Usenet Link Lines: 49 Message-ID: <417fns$1id@usenet1.interramp.com> References: <4105og$ev3@ixnews4.ix.netcom.com> <410efh$9ln@news.azstarnet.com> <410u0p$qk6@usenet1.interramp.com> <4133dd$3rl@news.azstarnet.com> NNTP-Posting-Host: ip11.ft.worth.tx.interramp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b5 (Windows; I; 16bit) To: N7WS@azstarnet.com Wes Stewart wrote: > >No, just some of you:) > >> If you don't have the >>plans he has been asking for then just shut up, hit the frigging delete >>key and move on to the next message. >> >>This is totally uncalled for, boorish, and JUST PLAIN RUDE. > >In your not so humble redundant opinion. (Are you a lawyer BTW?) > Actually, I DO read the groups quite often. My inflamatory response was directed at ALL of the "gee you sure are stupid for asking that kind of question" responses, not just the poor sole that finally drove me over the edge of inFLAMity :-) So it wasn't personal though I'm sure it seemed that way. I see a fellow ask a perfectly innocent question, and the first 10 responses imply he needs a new science project. These responses all have the flavor of the parent chiding the uneducated child for being about to stick his finger in the flaming gas burner. No one seems to make the presumption that the gentleman knows what he is doing, understands the law, and then proceeds to answer his question or at least enter in to an interesting discussion on building spark transmitters. This kind of behaviour is common here on the newsgroups. But my original statement prevails -- it IS RUDE. And its unnecessary. One could certainly say the same thing about my post -- but, this was the third thread I had read today which consisted of the same kind of responses and I quite simply lost my cool. Which is no excuse, but some explanation. I personally get tired of reading the stuff -- since it costs me money to access these newsgroups. The net has become overcrowded with folks who seem to take great delight in pointing out the flaws in what someone has said. Fortunately, one occasionally finds something of value amongst the chaff - and there have even been some posts on spark gap references. Peace .... Grant/NQ5T From amsoft@epix.net Mon Aug 21 18:13:31 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Date: Mon, 21 Aug 95 07:32:22 GMT Lines: 9 Message-ID: <808990317.16999@pinetree.microserve.com> References: <4105og$ev3@ixnews4.ix.netcom.com> <410efh$9ln@news.azstarnet.com> <410u0p$qk6@usenet1.interramp.com> <1995Aug19.143730.12189@ke4zv.atl.ga.us> <417g8e$1id@usenet1.interramp.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 Sheesh. One question about a science project and everyone thinks they're his mother. Good thing he wasn't asking how to build an electric chair. 73, Jack WB3U From amsoft@epix.net Mon Aug 21 18:13:32 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews From: au@ix.netcom.com (Einstein ) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where can I find plans for a spark gap transmitter? Good Grief! Date: 21 Aug 1995 05:37:02 GMT Organization: Netcom Lines: 11 Distribution: world Message-ID: <41961u$pqi@ixnews4.ix.netcom.com> References: <4105og$ev3@ixnews4.ix.netcom.com> <410efh$9ln@news.azstarnet.com> <410u0p$qk6@usenet1.interramp.com> <4133dd$3rl@news.azstarnet.com> <417fns$1id@usenet1.interramp.com> NNTP-Posting-Host: ix-eug-or1-24.ix.netcom.com This was seriously not intended for flame bait. The device was going to used into a dummy load of some type AND be low power! An all band reciever would demonstrate the width of a spark signal. My thanks to the many who responded! Flamers, what can I say but surely you must have better things to do with your time. George Worthington N7BUI (Eugene, OR) From amsoft@epix.net Mon Aug 21 18:13:32 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: ptracy@aol.com (PTracy) Newsgroups: rec.radio.amateur.homebrew Subject: Who had problem with MRF141G? Date: 20 Aug 1995 13:22:54 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 3 Sender: root@newsbf02.news.aol.com Message-ID: <417r1e$jvq@newsbf02.news.aol.com> References: <40vcua$h7e@mgate.arrl.org> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Are you still here? I possibly have some hints that could be helpful. Pat, KE1C From amsoft@epix.net Mon Aug 21 18:13:33 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!prodigy.com!usenet From: UYFA59A@prodigy.com (James Cullen iv) Newsgroups: rec.radio.amateur.homebrew Subject: World Record Attempt, High Power Rockets Date: 19 Aug 1995 23:44:40 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 42 Distribution: world Message-ID: <415t18$12ui@usenetz1.news.prodigy.com> NNTP-Posting-Host: inugap4.news.prodigy.com X-Newsreader: Version 1.2 Help! The Las Vegas chapter of Tripoli -- the national association of high power rocket enthusiasts -- is preparing to challange the world altitude record for high power rockets -- currently about 37,000 feet. We need help locating plans or a schematic for a tracking transmitter, antenna and receiver for the record attempt. Here's what we need: The transmitter must be able to fit into a tube that is 1-1/2" in diameter and no longer than 12 inches. It must operate for a minimum of one hour on batteries and be as light as possible. The operating frequency is not important as long as it is in the amateur bands. We need a minimum range of about 15 miles line of sight. The body of the rocket is constructed from phenolic-impregnated Kraft paper overwrapped with fiberglass. An antenna can be glued to the outside of the rocket body -- perhaps copper foil tape or some similar method. Radiation pattern from the transmitter should be omnidirectional, because we have no idea as to the position in which the rocket will land. The receiver can be just about anything that we can carry, as long as it is battery operated. The receiving antenna should be highly directional and hand held. If you have any suggestions on how I can obtain or construct a transmitter/receiver combination that will accomplish this task, please e- mail me at UYFA59A@ Prodigy.Com If you have any interest in being a part of this, let me know also. The attempt will be made in about 6 months, most likely in the Black Rock Desert of northern Nevada -- about 80 miles NNE of Reno. Thanks very much for your assistance. Jim Cullen, KA7RAF 9456 Mast Drive Las Vegas, NV 89117-0286 (702) 254-8815 From amsoft@epix.net Sun Aug 27 17:28:36 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!Rezonet.net!altitude!usenet From: ROMAR Newsgroups: rec.radio.amateur.homebrew Subject: (+) Plans/schemes for radio -- where to be found ? Date: 24 Aug 1995 23:33:25 GMT Organization: Communications Accessibles Montreal, Quebec Canada Lines: 5 Message-ID: <41j285$psd@Tandem.CAM.ORG> References: <41j1r4$psd@Tandem.CAM.ORG> NNTP-Posting-Host: romar.hip.cam.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) BTW, I forgot: reply me throug E-mail, please, at odin@nyongwa.montreal.qc.ca (I'll leave cam.org) Thanks. From amsoft@epix.net Sun Aug 27 17:28:37 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!titan.ksc.nasa.gov!kscdl1.cad.ksc.nasa.gov!k4dii.ksc.nasa.gov!user Newsgroups: rec.radio.amateur.homebrew Subject: Re: 20M/40M mobile antenna problem/question Message-ID: From: frederick.mckenzie-1@kmail.ksc.nasa.gov (Fred McKenzie) Date: Fri, 25 Aug 1995 14:26:41 -0400 References: <41d6pj$t15@noc.tor.hookup.net> Organization: NASA, Kennedy Space Center, Florida Nntp-Posting-Host: k4dii.ksc.nasa.gov Lines: 21 In article <41d6pj$t15@noc.tor.hookup.net>, Jeff Krul wrote: > I have a 20M/40Meter mobile vertical which was GIVEN to me by > the owner of the HF rig I purchased. (450sat). I constructed > a 'mobile' stand for the antenna out of plywood for DX > expeditions away from home. The base of the mobile antenna > sits about 10feet off the ground when on the stand. Jeff- The obvious trouble is that you only put up half of the antenna! Normally, the vehicle is part of a mobile antenna system, even though it may be small compared to the wavelength involved. You can't get along without it, or some equivalent ground plane. It is also possible to mount a pair of HF mobile antennas on a bracket, to form a shortened dipole. This won't work as well as a full size antenna, but is relatively portable. I purchased such a bracket from the company that sells the "Hamstick" mobile antennas. They had a table set up at one of the local hamfests. I haven't had a chance to try it yet. 73, Fred, K4DII From amsoft@epix.net Sun Aug 27 17:28:38 1995 Path: grape.epix.net!news.sprintlink.net!malgudi.oar.net!news.erinet.com!bug.rahul.net!a2i!kaiwan.kaiwan.com!ledge!bob.albert From: bob.albert@ledge.com (BOB ALBERT) Newsgroups: rec.radio.amateur.homebrew Subject: Amp. parts for sale Message-ID: <8AFE3D5.01B5001465.uuout@ledge.com> Date: Sat, 26 Aug 95 16:21:00 -0800 Distribution: world Organization: The Ledge PCBoard: Lake View Terrace, CA: USA: 818-896-2007 Reply-To: bob.albert@ledge.com (BOB ALBERT) X-Newsreader: PCBoard Version 15.21 X-Mailer: PCBoard/UUOUT Version 1.10 Lines: 11 I have parts to build some HF kilowatt amplifiers. Tubes, transformers, etc. And a couple of working amplifiers. Not asking a lot, but would prefer pickup in the Los Angeles area. I also have an oscilloscope, Tektronix 535 for sale or parts. And an old Dumont 401-R oscilloscope for parts. All this stuff works but I think I'll just part them out and probably get the same amount of money either way. Call me at 818-894-2887 after 10AM Pacific time. 73 DE K6DDX From amsoft@epix.net Sun Aug 27 17:28:38 1995 Path: grape.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: jchol@aol.com (JCHol) Newsgroups: rec.radio.amateur.homebrew Subject: Building amplifier - need load capacitor Date: 24 Aug 1995 20:38:24 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 5 Sender: root@newsbf02.news.aol.com Message-ID: <41j620$rs6@newsbf02.news.aol.com> Reply-To: jchol@aol.com (JCHol) NNTP-Posting-Host: newsbf02.mail.aol.com Please let me know if you have a 1.5kv air variable capacitor in the range of about 1000 picofarads. Possibly I could use a smaller one. It is for the plate tank circuit for an amplifier with two 3-500z tubes. Thanks for reading. 73 de John, WA5TWL.... From amsoft@epix.net Sun Aug 27 17:28:39 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!jms From: jms@col.hp.com (Mike Stansberry) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Building amplifier - need load capacitor Date: 25 Aug 1995 12:40:27 GMT Organization: HP Colorado Springs Division Lines: 9 Message-ID: <41kgbr$6ab@nonews.col.hp.com> References: <41j620$rs6@newsbf02.news.aol.com> NNTP-Posting-Host: mssjms.col.hp.com X-Newsreader: TIN [version 1.2 PL2] JCHol (jchol@aol.com) wrote: : Please let me know if you have a 1.5kv air variable capacitor in the range : of about 1000 picofarads. Possibly I could use a smaller one. It is for : the plate tank circuit for an amplifier with two 3-500z tubes. Yes, you could use a smaller one. Try around 200-250 pF. Mike, K0TER From amsoft@epix.net Sun Aug 27 17:28:40 1995 Path: grape.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: Building amplifier - need load capacitor Date: 25 Aug 1995 10:23:41 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 19 Sender: root@newsbf02.news.aol.com Message-ID: <41kmdd$a68@newsbf02.news.aol.com> References: <41kgbr$6ab@nonews.col.hp.com> Reply-To: w8jitom@aol.com (W8JI Tom) NNTP-Posting-Host: newsbf02.mail.aol.com : Please let me know if you have a 1.5kv air variable capacitor in the range : of about 1000 picofarads. Possibly I could use a smaller one. It is for : the plate tank circuit for an amplifier with two 3-500z tubes. >Yes, you could use a smaller one. Try around 200-250 pF. What? Only if he wants to stay on six meters or have a mess off switched padders. The 1000 won't even hit 160. I can't run the numbers but if uses the 3-500Z's at anywhere near rating the 1000 won't even hit 80 without a padder. Try to contact the manufacturers of amps to buy a cap. Ameritron, Ten-tec, etc. They buy them in bulk, and replacement parts are usually cheaper than surplus sales. I also have a ton of caps like that if you get stuck. 73 Tom From amsoft@epix.net Sun Aug 27 17:28:40 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Building amplifier - need load capacitor Date: 26 Aug 1995 11:08:32 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 6 Sender: root@newsbf02.news.aol.com Message-ID: <41nddg$ev8@newsbf02.news.aol.com> References: <41kmdd$a68@newsbf02.news.aol.com> Reply-To: w8jitom@aol.com (W8JI Tom) NNTP-Posting-Host: newsbf02.mail.aol.com Ohhh, wait a minute. I see why he said 250 pF (although that still won't hit 160). I think you post wasn't clear as to where you wereusing the cap. I assumed it was the load control, because of the low voltage and high capacitance you specified. I bet the other guy assumed it was the plate tuning cap! 73 Tom From amsoft@epix.net Sun Aug 27 17:28:41 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: jchol@aol.com (JCHol) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Building amplifier - need load capacitor Date: 26 Aug 1995 17:39:12 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 2 Sender: root@newsbf02.news.aol.com Message-ID: <41o4a0$lt7@newsbf02.news.aol.com> References: <41nddg$ev8@newsbf02.news.aol.com> Reply-To: jchol@aol.com (JCHol) NNTP-Posting-Host: newsbf02.mail.aol.com I agree with you, Tom. He must have figured it was the tune capacitor. I am planning on switching in some doorknobs to make up the difference. From amsoft@epix.net Sun Aug 27 17:28:42 1995 Path: grape.epix.net!news.sprintlink.net!parsifal.nando.net!usenet From: doughall@nando.net (Doug Hall) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Computer Interferance using RTTY Date: Fri, 25 Aug 1995 02:13:56 GMT Organization: JPS Communications, Inc. Lines: 28 Message-ID: <41jbja$boe@parsifal.nando.net> References: <41iuut$224@stratus.skypoint.net> Reply-To: doughall@nando.net NNTP-Posting-Host: vyger804.nando.net X-Newsreader: Forte Free Agent v0.46 knutsonj@skypoint.com (Jon Knutson) wrote: >This message isn't truly related to homebrewing but I thought you guys >might have the best idea as to what I should try here. >I have been trying to get into RTTY lately but am having a heck of a time >with my computer locking up when using 20 or 40 meters. It's ok on 10 >and 15. I have the cpu unit grounded have coils on the cables going into >the CPU but it really hasn't even made a differance. Any help on what to >try next would be greatly appreciated. >Thanks, KA0JZX >Jon Knutson Jon, You say you have coils on the cables - I assume you're talking about the serial cable from the RTTY unit and the audio lines. But what about the keyboard cable on your computer? My experience has been that keyboards vary in their susceptability to RF - some are immune to it and others roll over and die when you crank up the power. If you can borrow another keyboard to try, do it. You might find the problem there. 73, Doug, KF4KL From amsoft@epix.net Sun Aug 27 17:28:42 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!agate!darkstar.UCSC.EDU!news.scruz.net!cruzio!davew From: davew@cruzio.com Subject: Re: Computer Interferance using RTTY Reply-To: davew@cruzio.com Organization: Cruzio Community Networking System, Santa Cruz, CA Date: Sat, 26 Aug 1995 23:25:36 GMT Message-ID: References: <41iuut$224@stratus.skypoint.net> <41jbja$boe@parsifal.nando.net> Sender: davew@cruzio.com (David Wells) Lines: 25 In article <41jbja$boe@parsifal.nando.net>, doughall@nando.net (Doug Hall) writes: > knutsonj@skypoint.com (Jon Knutson) wrote: > > >I have been trying to get into RTTY lately but am having a heck of a time > >with my computer locking up when using 20 or 40 meters. It's ok on 10 > >and 15. I have the cpu unit grounded have coils on the cables going into > >the CPU but it really hasn't even made a differance. Any help on what to > >try next would be greatly appreciated. > > >Thanks, KA0JZX > >Jon Knutson > Jon, You may also want to ground the keyboard with a seperate ground braid. I opened mine and attached a braid made from the shield off a piece of RG58 to the ground plane in the keyboard, then ran it back to the PC case and then to the station ground. I run 1kw on all bands with no problem. Dave KD6TO . -- Dave Wells KD6TO; INTERNET: davew@cruzio.com Packet:KD6TO@K6LY.#CENCAL.CA.USA.NOAM; COMPUSERVE:74067,1755 (WA4UQQ Worldwide Amateur Radio Directory III KD6TO) . From amsoft@epix.net Sun Aug 27 17:28:43 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon From: Leon Heller Newsgroups: rec.radio.amateur.homebrew Subject: Re: Divide by ten front end for frequency counter Date: Thu, 24 Aug 95 17:46:42 GMT Organization: Home Lines: 28 Message-ID: <809286402snz@lfheller.demon.co.uk> References: <40rleh$i0h@pith.uoregon.edu> <40st8u$h1t@nrcnet0.nrc.ca> <415gsd$4l9@bud.shadow.net> <809205666snz@lfheller.demon.co.uk> Reply-To: Leon@lfheller.demon.co.uk X-NNTP-Posting-Host: lfheller.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 In article acj@ultranet.com "Jon Goguen" writes: > In article <809205666snz@lfheller.demon.co.uk>, Leon@lfheller.demon.co.uk wrote:> > > > GEC-Plessey make 3 GHz dividers. I've got their catalogue somewhere if > > you want more details. > > > Leon: > > Do you know of any source for these dividers in small quantities? They are rather specialised, so you might have problems in the US. The GEC Plessey N. American national sales office phone number is (408) 438-2900. They should be able to give you details of your nearest distributor. Pioneer Standard and Insight stock GPS products, and seem to have offices in most states. A typical component is the SP8904B that goes up to 7000 MHz! They make slower devices like the 3500 MHz SP8835B. 8-) These are both divide by 4s. Leon -- Leon Heller, G1HSM | "Do not adjust your mind, there is E-mail leon@lfheller.demon.co.uk | a fault in reality": on a wall Phone: +44 (0)1734 266679 | many years ago in Oxford. From amsoft@epix.net Sun Aug 27 17:28:44 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!titan.ksc.nasa.gov!kscdl1.cad.ksc.nasa.gov!k4dii.ksc.nasa.gov!user Newsgroups: rec.radio.amateur.homebrew Subject: Re: Divide by ten front end for frequency counter Message-ID: From: frederick.mckenzie-1@kmail.ksc.nasa.gov (Fred McKenzie) Date: Fri, 25 Aug 1995 14:41:43 -0400 References: <40rleh$i0h@pith.uoregon.edu> <40st8u$h1t@nrcnet0.nrc.ca> <415gsd$4l9@bud.shadow.net> Organization: NASA, Kennedy Space Center, Florida Nntp-Posting-Host: k4dii.ksc.nasa.gov Lines: 20 In article , acj@ultranet.com (Jon Goguen) wrote: > How do you make the divide by four that operates to 3 GHz? I was under > the impression that some sort of frequency conversion scheme was used to > bring high frequencies down prior to the dividers and counters, but direct > division would certainly be a lot easier. Jon- Division is easier, but requires longer to measure to the same accuracy. If you measure to one Hz with a one second time base and divide by 10, your new measurement will only be to ten Hz. Some counters, such as the Optoelectronics, use divide by 2 and divide by 4 prescalers for higher frequency measurements. Their circuitry automatically lengthens the timebase to match, so you end up with the same resolution at 2 or 4 times the original timebase, without having to do any math yourself. 73, Fred, K4DII From amsoft@epix.net Sun Aug 27 17:28:45 1995 Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet From: russ@mailhost.gslink.net (Russ Leblanc) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Drake R7 VCO hosed: stuck at 51.950 MHz Date: 25 Aug 1995 10:10:53 GMT Organization: Hurricane DX Club Lines: 18 Message-ID: <41k7jd$itd@ddi2.digital.net> References: <41e6pq$8ir@ddi2.digital.net> NNTP-Posting-Host: @204.215.242.151 X-Newsreader: WinVN 0.90.4 In article <41e6pq$8ir@ddi2.digital.net>, russ (russ@mailhost.gslink.net) says: > >I have an R7 with the digital readout installed that worked and then >froze on the above frequency on the display. I think I've narrowed >it down to the VCO board, probably the MC14046 PLL or one the the >following UA739 opamps stuck on the positive rail, which might account >for the failure mode. > Never mind, found the problem. Still, I welcome other comments from R7 users on fixes, mods, etc. Especially on how to change the #53 bulb on the tuning window without destroying the front panel . Russ From amsoft@epix.net Sun Aug 27 17:28:46 1995 Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!nntpdist.primenet.com!usenet From: Phil Diaz Newsgroups: rec.radio.amateur.homebrew Subject: gizmachi antenna Date: 25 Aug 1995 08:03:34 GMT Organization: Primenet Lines: 3 Message-ID: <41k04m$ns@nnrp1.primenet.com> NNTP-Posting-Host: ip198.prc.primenet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: radio.amateur.homebrew can anyone tell me how to build one? has anyone ever heard of a gizmachi antenna? i saw one very unique antenna and works very well...i'm told. From amsoft@epix.net Sun Aug 27 17:28:46 1995 Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!nntpdist.primenet.com!usenet From: Phil Diaz Newsgroups: rec.radio.amateur.homebrew Subject: gizmachi antenna Date: 25 Aug 1995 08:04:21 GMT Organization: Primenet Lines: 3 Message-ID: <41k065$ns@nnrp1.primenet.com> NNTP-Posting-Host: ip198.prc.primenet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: primenet@radio.amateur.homebrew can anyone tell me how to build one? has anyone ever heard of a gizmachi antenna? i saw one very unique antenna and works very well...i'm told. From amsoft@epix.net Sun Aug 27 17:28:47 1995 Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet From: "Davd L. Frey" Newsgroups: rec.radio.amateur.homebrew Subject: Help: Looking for info on Cascade Electronics Date: 26 Aug 1995 03:50:21 GMT Organization: FLORIDA ONLINE, Florida's Premier Internet Provider Lines: 8 Message-ID: <41m5lt$3o7@ddi2.digital.net> NNTP-Posting-Host: @pm4_14.digital.net I need the telephone number and address of a company called Cascade Electronics. They supply hardware for the electronic industry. Thank you, Dave Frey email: k3aax@ddi.digital.net From amsoft@epix.net Sun Aug 27 17:28:47 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!cadvision.com!usenet From: John Fallows Newsgroups: rec.radio.amateur.homebrew Subject: HF Propagation Software Date: 26 Aug 1995 22:09:38 GMT Organization: CADVision Lines: 5 Message-ID: <41o632$lie@cadvision.com> NNTP-Posting-Host: cad148.cadvision.com I am interested in communicating with anyone who experiments with or uses HF propagation evaluation software and theory. In particular, I am looking for some theory or algorithms on using A/K indices to adjust MUF calculations during ionospheric storms, etc. From amsoft@epix.net Sun Aug 27 17:28:48 1995 Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!swrinde!gatech!ncar!noao!math.arizona.edu!news.Arizona.EDU!usenet From: Kendel McCarley Newsgroups: rec.radio.amateur.homebrew Subject: Re: How do I make thru-plated holes? Date: Thu, 24 Aug 1995 10:12:17 -0700 (MST) Organization: The University of Arizona Lines: 27 Message-ID: References: <41gk0d$8ml@news.duke.edu> NNTP-Posting-Host: stat.nursing.arizona.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: > > > >I need to make a double layer board. I've done it before with rather > > >cheesy connections between the layers, but need to do a better job this > > >time or I won't be able to get to my solder connections. > > > > >Anyhow, I've looked at tining kits, but still don't have a clue as to how > > >I make a thru plated hole. > > > > It can be done. But you would be way ahead of the game if you simply > > paid the 2 or 3 hundred dollars necessary to get a commercial outfit > > to make a board for you. > > > I've never been able to get this cheap for boards I've had made for work related projects. I'm paying a little over two-hundred dollars in setup charges alone on a current project (photoplots, etc.) and I have shopped around. Anyhow, I'd still like to know how to make thru-plated holes. I can't justify several hundred dollars for a single, hobby-related board; especially when I could go out and buy a commercial product for about that much to do what I'm homebrewing. Kendel McCarley kendelm@ece.arizona.edu KC7FRS http://www.nursing.arizona.edu/~kendelm From amsoft@epix.net Sun Aug 27 17:28:49 1995 Path: grape.epix.net!news.sprintlink.net!itsmail1.hamilton.edu!NewsWatcher!user From: bcollett@hamilton.edu (Brian Collett) Newsgroups: rec.radio.amateur.homebrew Subject: Re: How do I make thru-plated holes? Date: Thu, 24 Aug 1995 16:44:02 -0500 Organization: Hamilton College - Clinton, NY 13323 (USA) Lines: 21 Message-ID: References: <41gk0d$8ml@news.duke.edu> <41i50r$iq1@news.azstarnet.com> NNTP-Posting-Host: 150.209.16.9 In article , geotek@cent.com wrote: > In Article<41i50r$iq1@news.azstarnet.com>, write: > > Path: esol.intermedia.com!newsjunkie.ans.net!howland.reston.ans.net!plug.news.pipex.net!pipex!tank.news.pipex.net!pipex!news.sprintlink.net!news.azstarnet.com!u > > >I belive thay have a > > >website, www.apcircuits.com/htmls/apc/apdel2.html > > > > > > > > I couldn't connect to this site:-( > > > > Wes -- N7WS > > > A little typo on the website > it should be www.apcircuits.com/htmls/apc/apdef2.html I tried that and couldn't get the doc so I searched and found it at http://www.cadvision.com/htmls/apc/apdef2.html . From amsoft@epix.net Sun Aug 27 17:28:51 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm!convex!cnn.exu.ericsson.se!news From: eus.eusmge@memo.ericsson.se (Mike Groves) Newsgroups: rec.radio.amateur.homebrew Subject: Re: How do I make thru-plated holes? Date: Fri, 25 Aug 1995 14:55:10 GMT Organization: Ericsson North America, Inc. Lines: 72 Message-ID: <41ko2m$j4c@cnn.exu.ericsson.se> References: <41gk0d$8ml@news.duke.edu> NNTP-Posting-Host: pc125011.exu.ericsson.se X-Newsreader: Forte Free Agent 1.0.82 Kendel McCarley wrote: >> > It can be done. But you would be way ahead of the game if you simply >> > paid the 2 or 3 hundred dollars necessary to get a commercial outfit >> > to make a board for you. >> > >> >I've never been able to get this cheap for boards I've had made for work >related projects. I'm paying a little over two-hundred dollars in setup >charges alone on a current project (photoplots, etc.) and I have shopped >around. >Anyhow, I'd still like to know how to make thru-plated holes. I can't >justify several hundred dollars for a single, hobby-related board; >especially when I could go out and buy a commercial product for about >that much to do what I'm homebrewing. And right you are. Some of the postings have been a little silly for a "HOMEBREW" newsgroup. Kendal, I design RF transistors and so as a rule I HAVE to make breadboard PCB's *fast* to test new designs. No time for outside services. I use one of those engraving machines to "etch" the PC board, but I'm still left with no through holes which makes for very poor RF grounding. Here are a few things I do: 1. Copper or brass shim. You can get it in real thin sheets (around 003"-.008" thick is best), and sometimes in rolls for bigger jobs. Cut a thin strip (1/16" works fine) to about a .25" length and feed it through either a pre-drilled hole, or a slit made through the board with an exacto knife. I use a small hole for FR-4 (your most common PCB material), and a slit for the more expensive (and softer) Teflon-Fiberglass material used in microwave applications. Now bend the "tabs" sticking out down flat on the board and solder both sides. They can be bent down in either a "Z" shape, or fold the top tab back over in the direction of the bottom tab to make a "U" shape. If you're clever, you can even make a 90 degree bend by folding it as it comes up through the hole. You can connect traces top and bottom by using combinations of the above. 2. Brass eyeletts. A little harder to find, but work great. You buy them according to the thickness of your PCB. They come a little longer than the board is thick. You put several at a time into pre-drilled holes, and place the PCB on a hard, flat surface. (At this point you are supposed to use a special tool, but the following technique work fine.) Hit the top of the eyelett lightly with a center punch to flair it out, then flatten it down to the PCB with a small hammer. A little solder top and bottom and you're all set. 3. A REAL inexpensive way is to use solid copper wire as a "plug" for a hole. Drill a hole exactly the same diameter as the wire you are using. Now you can feed a short length through the hole. Place your PCB on a hard surface and trim the wire using good "flush cutting" wire cutters a little bit above the PCB surface. You'll have to experiment with the length. Then hit the top of the wire with a small hammer. It will mushroom out slightly pinning it in the hole. Solder it in place and you're done. There are easier methods, but one of the criteria I have to use is the bottom surface of my PCB end up as flat as possible to mount it flat on a heat sink. Otherwise you could simply run a wire from top to bottom through a hole and be done with it. Whatever works for your application. I use the above methods to build prototype RF boards that perform well past 2 GHz. These ideas are NOT mine, I just use them. Good luck with your project! Other helpful comments by hams are encouraged here. Mike Groves (KD6PKJ) From amsoft@epix.net Sun Aug 27 17:28:52 1995 Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news.msfc.nasa.gov!bcm!convex!cnn.exu.ericsson.se!news From: fas@exu.ericsson.se (Frank Scaraglino) Newsgroups: rec.radio.amateur.homebrew Subject: Re: How do I make thru-plated holes? Date: 25 Aug 1995 16:20:40 GMT Organization: Ericsson North America Inc. Lines: 8 Message-ID: <41kt8o$ka2@cnn.exu.ericsson.se> References: <41gk0d$8ml@news.duke.edu> Reply-To: fas@exu.ericsson.se NNTP-Posting-Host: opus.rtp.ericsson.se you can make "plated thru holes" by using eyelets! there is a kit called a TRACK REPAIR Kit made by PACE I think TECHNITOOL sells it. It comes with eyelet Have fun --- _______________________________________________________________________ Frank Scaraglino scaraglino@egertp.ericsson.se KA2FWC From amsoft@epix.net Sun Aug 27 17:28:52 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!bud.shadow.net!news From: Eliot Fenton <72633.3247@compuserve.com> Newsgroups: rec.radio.amateur.homebrew Subject: Re: How do I make thru-plated holes? Date: 27 Aug 1995 00:56:38 GMT Organization: ICS Inc. Lines: 17 Message-ID: <41ofs6$r4u@bud.shadow.net> References: <41gk0d$8ml@news.duke.edu> <41kt8o$ka2@cnn.exu.ericsson.se> NNTP-Posting-Host: ppp-ftl2-23.shadow.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b6 (Windows; I; 16bit) You can get eyelets from the following company: International Eyelets Inc. 1240 Keystone Way Vista CA 92083 Tel 1 1-800-333-9353 Fax 1-619-598-4007 I've been using eyelets with a center punch successfully in ckts. up to 4 GHz. Eyelets will usually perform better than wires due to their lower inductance. -- Eliot Fenton 72633.3247@compuserve.com From amsoft@epix.net Sun Aug 27 17:28:53 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.west.net!news.west.net!not-for-mail From: steamer@west.net (Edward Haas) Newsgroups: rec.radio.amateur.homebrew,rec.crafts.metalworking Subject: Re: How to Space-Wind Coils? Followup-To: rec.radio.amateur.homebrew,rec.crafts.metalworking Date: 24 Aug 1995 22:21:20 -0700 Organization: West.Net Communications Lines: 14 Message-ID: <41jmkg$p1o@acme.sb.west.net> References: <808363044.19680@pinetree.microserve.com> <1995Aug19.031228.21475@nosc.mil> NNTP-Posting-Host: acme.sb.west.net X-Newsreader: TIN [version 1.2 PL2] Xref: grape.epix.net rec.radio.amateur.homebrew:9152 rec.crafts.metalworking:15451 I believe one technique of doing this is referred to as "bifilar winding" and had to do with increasing the cross-sectional area of the coil by winding, simultaneously, two wires, which needn't be of the same diameter, one would suppose. I did just this, when I needed to wrap some wire around a tubular structure that was too tight a bend for a larger cross-section wire. You might try something like this, just making sure that the spacer-wire doesn't contact the wire that's carrying the current... -- "Steamboat Ed" Haas : Four a good time, phone: (805) 968-7534 : finger steamer|more FAX: (805) 562-8928 : ---Decks a-wash in a sea of words--- From amsoft@epix.net Sun Aug 27 17:28:53 1995 Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: davisj@harborside.COM (Joe Davis) Newsgroups: rec.radio.amateur.homebrew Subject: I want to subscribe to your mailing list Date: 26 Aug 95 06:48:23 GMT Organization: ucsd usenet gateway Lines: 7 Message-ID: NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I would like to subscribe to your mailing list. It is my goal to start buiildingg my own stuff. Thank You Joe W. Davis N4EJF/7 mail to davisj@harborside.com From amsoft@epix.net Sun Aug 27 17:28:54 1995 Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!mn6.swip.net!seunet!mn3.swip.net!lertsbbs!sm7dlz From: sm7dlz@reimers.se (Sm7dlz) Newsgroups: rec.radio.amateur.homebrew Subject: Info DX mailgroup Date: Fri, 25 Aug 1995 09:10:00 GMT Message-ID: <950825071414339@reimers.se> Organization: SpaceNet Online Sweden +4641813926 Distribution: world Lines: 10 Hi all! Please help me with the right adress to the DX mailgroup. Have tried several but I always get the msg "failed" in return. 73 de Hans SM7DLZ --- * QMPro 1.51 * Chernobyl used Microsoft Windows. From amsoft@epix.net Sun Aug 27 17:28:55 1995 Path: grape.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk!Leon From: Leon Heller Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew Subject: Re: Jamming LW Radio Date: Fri, 25 Aug 95 17:25:16 GMT Organization: Home Lines: 17 Message-ID: <809371516snz@lfheller.demon.co.uk> References: <41kn0p$phu$1@mhadg.production.compuserve.com> Reply-To: Leon@lfheller.demon.co.uk X-NNTP-Posting-Host: lfheller.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 Xref: grape.epix.net rec.radio.amateur.antenna:13292 rec.radio.amateur.homebrew:9162 In article <41kn0p$phu$1@mhadg.production.compuserve.com> 100607.1743@CompuServe.COM "David Lees" writes: > Anyone any idea how I could Jam a radio Long Wave radio station > (Atlantic 252 to be accurate)............ > > Please help if you can! To start with, you'll need a big garden for the antenna! Plus lots of money for the electricity bill. 8-) Leon -- Leon Heller, G1HSM | "Do not adjust your mind, there is E-mail leon@lfheller.demon.co.uk | a fault in reality": on a wall Phone: +44 (0)1734 266679 | many years ago in Oxford. From amsoft@epix.net Sun Aug 27 17:28:55 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: David Lees <100607.1743@CompuServe.COM> Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew Subject: Jamming LW Radio Date: 25 Aug 1995 14:34:01 GMT Organization: none Lines: 4 Message-ID: <41kn0p$phu$1@mhadg.production.compuserve.com> Xref: grape.epix.net rec.radio.amateur.antenna:13309 rec.radio.amateur.homebrew:9167 Anyone any idea how I could Jam a radio Long Wave radio station (Atlantic 252 to be accurate)............ Please help if you can! From amsoft@epix.net Sun Aug 27 17:28:56 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!news.ksu.ksu.edu!hptemp1.cc.umr.edu!dstuart From: dstuart@rocket.cc.umr.edu (Dave Stuart (dstuart@umr.edu)) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew Subject: Re: Jamming LW Radio Followup-To: rec.radio.amateur.antenna,rec.radio.amateur.homebrew Date: 25 Aug 1995 20:11:59 GMT Organization: UMR Missouri's Technological University Lines: 16 Message-ID: <41laqf$4l7@hptemp1.cc.umr.edu> References: <41kn0p$phu$1@mhadg.production.compuserve.com> NNTP-Posting-Host: rocket.cc.umr.edu X-Newsreader: TIN [version 1.2 PL2] Xref: grape.epix.net rec.radio.amateur.antenna:13321 rec.radio.amateur.homebrew:9176 David Lees (100607.1743@CompuServe.COM) wrote: : Anyone any idea how I could Jam a radio Long Wave radio station : (Atlantic 252 to be accurate)............ : Please help if you can! Isn't that kind of un amatureish? -- -- Dave Stuart dstuart@umr.edu University of Missouri -- Rolla KB0SLY From amsoft@epix.net Sun Aug 27 17:28:56 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!torn!newshost.uwo.ca!irus.rri.uwo.ca!ppicot From: ppicot@irus.rri.uwo.ca (Paul Picot) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew Subject: Re: Jamming LW Radio Date: 25 Aug 1995 20:46:52 GMT Organization: U.N.C.L.E. Lines: 14 Message-ID: <41lcrs$s4m@falcon.ccs.uwo.ca> References: <41kn0p$phu$1@mhadg.production.compuserve.com> NNTP-Posting-Host: oort.irus.rri.uwo.ca Xref: grape.epix.net rec.radio.amateur.antenna:13322 rec.radio.amateur.homebrew:9177 In article <41kn0p$phu$1@mhadg.production.compuserve.com> David Lees <100607.1743@CompuServe.COM> writes: >Anyone any idea how I could Jam a radio Long Wave radio station >(Atlantic 252 to be accurate)............ How about an air drop? I was always quite fond of black currant myself. It should stain the building nicely, but you'll need a 45-gallon drum of it... :-) But seriously: why would you want to interfere with a LW station? It is a navigation aid, isn't it? The penalties for doing such a thing should dissuade you. But to give an answer: the most effective way to interfere with its transmissions would be to drive a large truck into the transmitter From amsoft@epix.net Sun Aug 27 17:28:57 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!tcsi.tcs.com!agate!news.mindlink.net!news From: andrew_taylor@mindlink.bc.ca (Andrew Taylor) Newsgroups: rec.radio.amateur.homebrew Subject: K Beep! Date: 27 Aug 1995 00:17:14 GMT Organization: MIND LINK! - British Columbia, Canada Lines: 8 Message-ID: <41odia$m8e@fountain.mindlink.net> NNTP-Posting-Host: line012.nwm.mindlink.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 Hello, Id like to build an "roger beep"....can't seem to find any schematics anyplace. Id appreciate it if you can help me out! thanks Andrew T andrew_taylor@mindlink.bc.ca From amsoft@epix.net Sun Aug 27 17:28:58 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ao974 From: ao974@FreeNet.Carleton.CA (Dave Scobie) Subject: Re: Laser printer --> Panel, how? Message-ID: Sender: ao974@freenet2.carleton.ca (Dave Scobie) Reply-To: ao974@FreeNet.Carleton.CA (Dave Scobie) Organization: The National Capital FreeN References: <41d6o1$or4@ixnews7.ix.netcom.com> Date: Fri, 25 Aug 1995 05:44:50 GMT Lines: 18 Snip ..... Toner is usually a composite of styrene and carbon perhaps with some tint. Normally sepia,cyan, magenta, yellow and black. There are other combinations ...... The styrene is melts or dissolved, applied to the copy(transfer) and fixed by heat, pressure or evaporation.The liquid toners often lack viscosity. In order to create the amount of solid fill necessary to create a decent transfer, you need powder. The lacquer merely melts a layer of toner off the transfer and causes it to stick to the destination material, When the solvent evaporates, it is set. Try not to smear it. Good luck 73 de VA3AE -- Across time and culture, few have had the exquisite pleasure of a fresh piece of paper and a new box of crayolas. From amsoft@epix.net Sun Aug 27 17:28:59 1995 Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!seunet!news2.swip.net!news.algonet.se!usenet From: cj@algonet.se (Christer Johansson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Laser printer --> Panel, how? Date: Fri, 25 Aug 1995 19:08:20 GMT Organization: HTH Lines: 28 Message-ID: <41l773$l0j@alecto.algonet.se> References: <41d6o1$or4@ixnews7.ix.netcom.com> <41dcct$cof@news.indy.net> Reply-To: cj@algonet.se NNTP-Posting-Host: sophocles.algonet.se X-Newsreader: Forte Free Agent 1.0.82 gbrush@indy.net (Greg Brush) wrote: >: Maybe this is old news and I just didn't get the word, but I'm >: wondering how I can transfer laser-printed artwork onto a panel. Is >: there something equivalent to dry-transfer lettering for printers? >: Thanks for any info. >I wish I had the name of the company off hand, but one of the toner >transfer PCB products I've used, touted their product for producing panel >graphics as well. In brief, you print on their release paper, spray the >printed side of the paper with clear lacquer and let dry. Then, cut the >area out you want to use as a transfer, soak in water for a few minutes >and it slips off the release paper just like a decal (for those that have >built styrene models). They say it should work on other types of printers >too (probably won't work on inkjets that use water soluble inks, IMO). If my memory serves me the name of the company is "Dyna Art Designs" in US, or am I wrong ? /Christer -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- * High Tech Horizon - Christer Johansson - * email: cj@algonet.se * -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien * >> World Wide Web - http://www.algonet.se/~cj/catalog.html << -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- From amsoft@epix.net Sun Aug 27 17:28:59 1995 Path: grape.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: shack9529@aol.com (SHACK 9529) Newsgroups: rec.radio.amateur.homebrew Subject: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE Date: 26 Aug 1995 00:28:38 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 5 Sender: root@newsbf02.news.aol.com Message-ID: <41m7tm$ldh@newsbf02.news.aol.com> Reply-To: shack9529@aol.com (SHACK 9529) NNTP-Posting-Host: newsbf02.mail.aol.com DOES ANYONE KNOW HOW TO MAKE AN OSCILLATION CIRCUIT THAT WILL INTERFERE WITH TV. MY PURPOSE IS TO USE IT AS A JOKE DURING FOOTBALL GAMES AT A FRIENDS HOUSE. PLEASE HELP! THANKS From amsoft@epix.net Sun Aug 27 17:29:00 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsjunkie.ans.net!esol.intermedia.com!news From: geotek@cent.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE Date: Sat, 26 Aug 95 07:06:20 PDT Organization: (None) Lines: 12 Message-ID: References: <41m7tm$ldh@newsbf02.news.aol.com> NNTP-Posting-Host: 204.149.224.22 Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage In Article<41m7tm$ldh@newsbf02.news.aol.com>, writes: > > DOES ANYONE KNOW HOW TO MAKE AN OSCILLATION CIRCUIT THAT WILL INTERFERE > WITH TV. MY PURPOSE IS TO USE IT AS A JOKE DURING FOOTBALL GAMES AT A > FRIENDS HOUSE. > > PLEASE HELP! THANKS Beg, borrow, or steal a grid dip meter or its modern equivalent. Don't forget to wear a kevlar vest. From amsoft@epix.net Sun Aug 27 17:29:01 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.sandia.gov!tesuque.cs.sandia.gov!SantaFe!usenet From: Jim Potter Newsgroups: rec.radio.amateur.homebrew Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE Date: 27 Aug 1995 13:04:51 GMT Organization: JP Accelerator Works, Inc. Lines: 23 Message-ID: <41pqhj$k4t@tierra.santafe.edu> References: <41m7tm$ldh@newsbf02.news.aol.com> NNTP-Posting-Host: dial130.roadrunner.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b6 (Windows; I; 16bit) To: shack9529@aol.com A possible approach is to get a TV tuner, the kind that has has a voltage controlled oscillator and covers tha cable channels. I built a sweep generator using one and it covered from 50 MHz to 950 MHz in about 4 ranges each covering approxiamtely a 2 to 1 frequency range. You'll need the wiring information to know where to apply power and how to switch the frequency range. And, then you have to figure out where to couple out some of the rf. That's not too hard since ther is a frequency divider in there for the phase lock circuitry and you can probably steal from its input without messing things up too much. Radio Shack used to have one in a blister pack. And, there have been articles in Ham Magazines about using TV tuners as the local oscillator in a spectrum analyzer. Someone was even selling a kit at one time. Of course, the grid dip oscillator approach is quick since you don't have to build anything. -- =================================================================== James M. Potter, President Internet: jpotter@jpaw.com JP Accelerator Works, Inc. AOL: jpawi@aol.com 2245 47th Street Voice: 505-662-5804 Los Alamos, NM 87544-1604 FAX: 505-662-5210 From amsoft@epix.net Sun Aug 27 17:29:01 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.uoregon.edu!vixen.cso.uiuc.edu!uwm.edu!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail From: skulyov@freenet.columbus.oh.us (Sergei Kulyov) Newsgroups: rec.radio.amateur.homebrew Subject: Need help with Super super Dentron tuner Date: 27 Aug 1995 13:44:15 -0400 Organization: The Greater Columbus FreeNet Lines: 8 Message-ID: <41qatf$de3@acme.freenet.columbus.oh.us> NNTP-Posting-Host: acme.freenet.columbus.oh.us X-Newsreader: TIN [version 1.2 PL2] Hi gang. I have a Super super Dentron antenna tuner with one missed part inside. There are one air vary capacitor, balun, and couple air core coils. Does anybody could help with schematic or suggestion about the missed part? Thanks, 73! Sergei AA8OT, UA3AP From amsoft@epix.net Sun Aug 27 17:29:02 1995 Path: grape.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: lynngol@aol.com (LynnGol) Newsgroups: rec.radio.amateur.homebrew Subject: Need source of custom CERAMIC Filters for 240kHz Date: 25 Aug 1995 23:09:48 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 7 Sender: root@newsbf02.news.aol.com Message-ID: <41m39s$hbh@newsbf02.news.aol.com> Reply-To: lynngol@aol.com (LynnGol) NNTP-Posting-Host: newsbf02.mail.aol.com I am looking for a company that can build custom Ceramic Filters for 240 kHz. All the places I found just sell off-the-shelf units. Quantity needs are in the low 1000's per year. Mark KH6HPQ From amsoft@epix.net Sun Aug 27 17:29:03 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!in2.uu.net!panix!bloom-beacon.mit.edu!news.kei.com!ub!galileo.cc.rochester.edu!alfalfa.pas.rochester.edu!bill From: bill@alfalfa.pas.rochester.edu (Bill VanRemmen) Subject: Re: Need source of custom CERAMIC Filters for 240kHz Message-ID: <1995Aug27.022846.22484@galileo.cc.rochester.edu> Sender: news@galileo.cc.rochester.edu Nntp-Posting-Host: alfalfa.pas.rochester.edu Organization: University of Rochester Computing Center X-Newsreader: TIN [version 1.2 PL0] References: <41m39s$hbh@newsbf02.news.aol.com> Date: Sun, 27 Aug 95 02:28:46 GMT Lines: 9 LynnGol (lynngol@aol.com) wrote: : I am looking for a company that can build custom Ceramic Filters for 240 : kHz. Don't know if they do custom filters, but have you tried muRata/Erie? 404-436-1300 -Bill, KA2WFJ From amsoft@epix.net Sun Aug 27 17:29:03 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!usc!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!not-for-mail From: skulyov@freenet.columbus.oh.us (Sergei Kulyov) Newsgroups: rec.radio.amateur.homebrew Subject: Need: MFJ-8621 schematic Date: 27 Aug 1995 13:54:04 -0400 Organization: The Greater Columbus FreeNet Lines: 5 Message-ID: <41qbfs$era@acme.freenet.columbus.oh.us> NNTP-Posting-Host: acme.freenet.columbus.oh.us X-Newsreader: TIN [version 1.2 PL2] Hi gang. I'm looking for the schematic of Data radio MFJ-621. Will appreciate for any help. 73! Sergei AA8OT, UA3AP From amsoft@epix.net Sun Aug 27 17:29:05 1995 Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news1.halcyon.com!chinook.halcyon.com!mcraw From: Marshall Craw Newsgroups: rec.radio.swap,rec.radio.scanner,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: NEW HAM RADIO REMOTE CONTROL PRODUCT OFFERED Date: Thu, 24 Aug 1995 18:37:01 -0700 Organization: Northwest Nexus Inc. Lines: 35 Message-ID: References: NNTP-Posting-Host: chinook.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Xref: grape.epix.net rec.radio.swap:42064 rec.radio.scanner:31130 rec.radio.amateur.homebrew:9149 rec.radio.amateur.digital.misc:10180 I am pleased to announce a new product offered by Positive Time Systems called the RCS-I. This is a radio controller that connects to any VHF/UHF transceiver and can issue x-10 commands. (X-10 is a power line standard for controlling devices throughout a building. Sears, Radio Shack, and others offer these compatible units) The unit also has an alarm input, a listen feature, a short voicmail box, and responds to all commands in a pleasant female voice. The system IDs with your recorded voice and call sign. This description doesn't do the product justice, so please check out the new homepage at : http://www.halcyon.com/pos.time.sys/top or you may email us with you address so that we can promptly send you our brochure and newsletter. NOTE: This product is intended for US voltages of 120 / 220 VAC. Another version is offered to support other international power standards. FLASH! NEW FEATURE! The RCS-I has a new feature called Secure Access Mode(SAM). When enabled, the access code changes dozens of times per hour, making it virtually impossible to hack into. This Product will work on other radio services like GMRS. Marine and Business bands! Thank You, Marshall Craw Positive Time Systems (206) 888-5999 470 E North Bend Way, Suite 115 North Bend, WA 98045 From amsoft@epix.net Sun Aug 27 17:29:05 1995 Path: grape.epix.net!news.sprintlink.net!news.zeitgeist.net!punchdown.zocalo.com!usenet From: Jeffrey Pawlan Newsgroups: rec.radio.swap,rec.radio.scanner,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: NEW HAM RADIO REMOTE CONTROL PRODUCT OFFERED Date: 25 Aug 1995 19:12:17 GMT Organization: Zocalo Engineering - Berkeley, California, USA Lines: 3 Message-ID: <41l7ah$ll@punchdown.zocalo.com> References: NNTP-Posting-Host: 192.135.76.232 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.4 sun4m) X-URL: news:Pine.ULT.3.91.950824183339.3500A-100000@chinook.halcyon.com Xref: grape.epix.net rec.radio.swap:42144 rec.radio.scanner:31174 rec.radio.amateur.homebrew:9174 rec.radio.amateur.digital.misc:10204 So you, too, can flush your toilet by remote control while sitting in rush-hour traffic! From amsoft@epix.net Sun Aug 27 17:29:06 1995 Path: grape.epix.net!news.sprintlink.net!news.azstarnet.com!usenet From: Wes Stewart Newsgroups: rec.radio.amateur.homebrew Subject: Re: Noise Figure Circles Date: 25 Aug 1995 01:08:54 GMT Organization: Arizona Daily Star - AZSTARNET Lines: 31 Message-ID: <41j7r6$ef@news.azstarnet.com> References: <41ikb0$qgq@news.duke.edu> NNTP-Posting-Host: sprite213.azstarnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b2 (Windows; I; 16bit) Super-User wrote: >I am trying to plot noise figure circles for a preamplifier at 400 MHz. Anybody >know a good way to do that? > >or: > >If I have a 50 ohm source and I want to continuously transform it from some low >impedance (around 2-5 ohms) to something like 100 or 1000 ohms how can I do >that? This is for plotting circles of constant noise figure on the resistance >axis of the Smith Chart. > >I am thinking about coupling the 50 ohm noise source into a big resonator and >then using a variable output coupling to get my impedance transform. Will that >work? > Steve: I believe what you are wanting to do is make the noise source look like a source impedance which varies over some area of the Smith chart. You can't plot circles ON the resistance axis tho ;-) You might try using a double or triple-stub tuner, but understand that you almost need a network analyzer to measure looking back into the tuner/noise source to determine the actual source impedance. Also, the tuner losses directly subtract from the ENR of the noise source, so you must determine them as well if you want accurate noise figure numbers. HTH, Regards, Wes -- N7WS From amsoft@epix.net Sun Aug 27 17:29:09 1995 Path: grape.epix.net!news.sprintlink.net!gatech!newsfeed.pitt.edu!godot.cc.duq.edu!news.duke.edu!usenet From: Super-User Newsgroups: rec.radio.amateur.homebrew Subject: Noise Figure Circles Date: 24 Aug 1995 19:36:00 GMT Organization: Duke University, Durham, NC, USA Lines: 18 Message-ID: <41ikb0$qgq@news.duke.edu> NNTP-Posting-Host: shadow.mc.duke.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; IRIX 5.3 IP19) X-URL: news:rec.radio.amateur.homebrew I am trying to plot noise figure circles for a preamplifier at 400 MHz. Anybody know a good way to do that? or: If I have a 50 ohm source and I want to continuously transform it from some low impedance (around 2-5 ohms) to something like 100 or 1000 ohms how can I do that? This is for plotting circles of constant noise figure on the resistance axis of the Smith Chart. I am thinking about coupling the 50 ohm noise source into a big resonator and then using a variable output coupling to get my impedance transform. Will that work? sas@orion.mc.duke.edu steve From amsoft@epix.net Sun Aug 27 17:29:10 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!simtel!lll-winken.llnl.gov!enews.sgi.com!wdl1.wdl.loral.com!enterprise!pax!jeffa From: jeffa@pax.ssd.loral.com (Jeff Albom) Subject: Re: Noise Figure Circles Message-ID: <1995Aug25.154849.4655@ssd.loral.com> Sender: jeffa@pax (Jeff Albom) Organization: Space Systems Loral References: <41ikb0$qgq@news.duke.edu> Date: Fri, 25 Aug 1995 15:48:49 GMT Lines: 32 It is not essential to plot noise figure circles for most circuits. As long as the circuit is "nicely behaved" (most amps and low Q circuits, forthat matter, are), you can take measurements at a set of match conditions and use these match points to generate iso-noise match curves (which are usually similar to circles). The same technique applies to load-pull measurements. Of course, you need to know the match that you are providing to the amplifier. This usually means measuring the matching circuit/tuner w/ a vector network analyzer or phase meter. At 400MHZ, you could use a very fast scope to compare amp/phase of the direct and coupled ports of a coupler in-line with your tuner, but then you have to calibrate out the coupler effects (there is loss and phase between direct and coupled ports on a well isolated coupler of, say, broadwall or stripline/microstrip variety). Another option is to use a tuner or known VSWR match and put a variable delay line between it and a coupler and the amp. As normal, put detectors on the direct and coupled ports of the coupler. Twiddle the delay line through a full cycle of coupler readings. If you can determine a single point on the tuner curve (via phase meter or VNA), you essentially referenced that point to the associated noise figure and all other points since the other points describe a circle locus w/ the Smith chart center as center of the locus. Of course, you still need to measure the noise figure at points along the phase rotation locus of matches. It's just that now, you don't have to determine the match for n arbitrary loads. Even better if you hook a VNA to the coupler and calibrate the measurement system. With this, the match shows up on the VNA and all you have to do is take noise figure measurements at points along the locus. It all boils down to what equipment you have available. ************************************************************************* What appears to be a sloppy or meaningless use of words may well be a completely correct use of words to express sloppy or meaningless ideas. ************************************************************************* jeffa@sesinc.com From amsoft@epix.net Sun Aug 27 17:29:10 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!col.hp.com!simtel!harbinger.cc.monash.edu.au!yoyo.aarnet.edu.au!fang.dsto.defence.gov.au!dstos3.dsto.defence.gov.au!cusick From: cusick@dstos3.dsto.defence.gov.au Newsgroups: rec.radio.amateur.homebrew Subject: Re: PCB & Iron-on transfer Date: 21 Aug 95 08:28:41 +1030 Organization: Defence Science and Technology Organisation Lines: 12 Message-ID: <1995Aug21.082841.1@dstos3.dsto.defence.gov.au> NNTP-Posting-Host: dstos3.dsto.gov.au For those who are interested, I have used ordinary photocopy paper, and transfered the image onto the PCB using the usual hot iron trick. To remove the paper, soak the board and paper in a strong (50%) blend of household bleach and water. After a few minutes, the paper will dissolve leaving the toner behind. By carefully using your finger, you can remove the fur left behind. Greg VK3BRQ From amsoft@epix.net Sun Aug 27 17:29:12 1995 Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet From: russ@gslink.net (Russ Leblanc) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew Subject: Re: phased array receiving antennas Date: 26 Aug 1995 02:34:42 GMT Organization: Hurricane DX Club Lines: 41 Message-ID: <41m182$r1m@ddi2.digital.net> References: NNTP-Posting-Host: @204.215.242.151 X-Newsreader: WinVN 0.90.4 Xref: grape.epix.net rec.radio.amateur.antenna:13324 rec.radio.amateur.homebrew:9178 In article , steve@hi.com (Steve Byan) says: >My next problem is designing a high-input-impedance, high-dynamic-range >differential RF amp for the output of the phase shift network. And don't forget low noise, Steve ;-) I work on such ... >I've noticed the new JPS antenna noise canceling unit (which is a >phased-array receiving antenna, intended to null locally-generated RFI I wouldn't quite call it a phased array. You simply either pickup (radio) or synthesize the offending signal, flip the phase 180 degrees, sum the signals, and voila! Noise reduction. An old dog learning new tricks... >noise) must use some kind of wideband phase-shift network, since it covers >at least 3 to 30 MHz with only a two-position bandswitch: low band and >high band. Has anyone opened one of these up? What does the phasing >network look like? Is it a polyphase network? What does JPS use for an >amplifier? According to info leaked out, its a hybrid combiner, and accounts for some loss of the desired receive signal. My guess is that it's transformer based, the noise signal being fed 180 out from the main antenna. The phase shift network compensates for phase error due to parasitics in the network which might cause the noise channel to deviate from desired 180 degrees as a function of frequency. I'm guessing here, but WILL find the eventual answer. I've played with one at a local ham store, and on first trial it did eradicate some local power line noise. My original desire was for a wideband antenna phaser for far-field null-steering apps as well as diversity reception. Russ From amsoft@epix.net Sun Aug 27 17:29:12 1995 Path: grape.epix.net!news.sprintlink.net!malgudi.oar.net!news.erinet.com!bug.rahul.net!a2i!sierra.net!brockway-d229.sierra.net!user From: tetrault@sierra.net (Robert Tetrault) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Plans/schemes for radio -- where to be found ? Date: Thu, 24 Aug 1995 21:45:38 -0700 Organization: Engineered Solutions Lines: 5 Message-ID: References: <41j1r4$psd@Tandem.CAM.ORG> NNTP-Posting-Host: 204.94.234.229 Suggest you get a current copy of the Handbook from the Radio Society of Great britain. They seem to have a lively activity of receiver builders, of a very high order. Prepare for a technically demanding project. > > Thanks. From amsoft@epix.net Sun Aug 27 17:29:14 1995 Path: grape.epix.net!news.sprintlink.net!metro.atlanta.com!nntp.atlanta.com!news From: kb8rjy@arbornet.org (kb8rjy) 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 Subject: QSL cards Date: Sat, 26 Aug 1995 20:28:49 GMT Organization: Marquette Senior High School Lines: 77 Message-ID: <41ntdp$6qv@nntp.atlanta.com> Reply-To: kb8rjy@arbornet.org NNTP-Posting-Host: pm039-04.dialip.mich.net X-Newsreader: Forte Free Agent 1.0.82 Xref: grape.epix.net rec.radio.amateur.antenna:13334 rec.radio.amateur.digital.misc:10215 rec.radio.amateur.equipment:16238 rec.radio.amateur.homebrew:9186 rec.radio.amateur.misc:85542 rec.radio.amateur.policy:29118 rec.radio.amateur.space:4671 Check this out - QSL cards! With your own custom graphics, and text... only $5.95 for 50!... Custom design your cards with up to 80 Characters of text, and Your own scanned graphic / or antenna graphic. Just fill out the following form, and send with total (check or money order) to: Shaun Qualheim, KB8RJY QSL cards Dept. BBS 224 Cherry Creek Road Marquette, MI 49855 (Print, and cut here:) ________________________________________________________________________________ Order Form: QSL Cards ________________________________________________________________________________ Front Text: ____________________________________________________________________ ________________________________________________________________________________ (up to 80 characters on front) - back will have standard QSL reply fields. Is a graphic/photo to be scanned included? (yes/no) ____ Do you wish to have the antenna included on your qsl card instead? (yes/no) ____ Number of sets: (50 in a set, $5.95 a set) ____ times $5.95 = ____ Plus Shipping and handling: ($1.50 per set) ____ times $5.95 = ____ Plus Scanning fee ($1.00) ____ TOTAL (sets + s & h + scan fee) =____ ________________________________________________________________________________ (cut here) Thank You Shaun Qualheim, kb8rjy Internet: kb8rjy@m-net.arbornet.org From amsoft@epix.net Sun Aug 27 17:29:15 1995 Path: grape.epix.net!news.sprintlink.net!metro.atlanta.com!nntp.atlanta.com!news From: kb8rjy@arbornet.org (kb8rjy) 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 Subject: QSL cards - qslad.txt (1/1) Date: Sat, 26 Aug 1995 19:25:06 GMT Organization: Internet Atlanta Lines: 75 Message-ID: <41npm9$662@nntp.atlanta.com> NNTP-Posting-Host: pm039-04.dialip.mich.net X-Newsreader: Forte Free Agent 1.0.82 Xref: grape.epix.net rec.radio.amateur.antenna:13333 rec.radio.amateur.digital.misc:10214 rec.radio.amateur.equipment:16235 rec.radio.amateur.homebrew:9185 rec.radio.amateur.misc:85538 rec.radio.amateur.policy:29116 rec.radio.amateur.space:4668 begin 644 qslad.txt M0VAE8VL@=&AI6]U2!#65S+VYO*2!?7U]?("`@("`@("`@("`@("`@("`@("`@(`T*1&\@ M>6]U('=I4!M+6YE="YA Newsgroups: rec.radio.amateur.homebrew Subject: Re: RF design Date: 27 Aug 1995 01:00:55 GMT Organization: ICS Inc. Lines: 16 Message-ID: <41og47$r4u@bud.shadow.net> References: <41htin$6l9@aztec.co.za> NNTP-Posting-Host: ppp-ftl2-23.shadow.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2b6 (Windows; I; 16bit) To: workshop@pcm.co.za workshop@pcm.co.za (Workshop) wrote: >Is there anyone out there who can tell me if there are any sites on the internet where I can find out about RF design. >For example designing impedance matching circuits etc. >Pls email me at the above address >thanx >Robin You might check Motorola's site (I don't have the address off hand, but it's fairly easy to find with Yahoo, Lycos, etc.); they have app notes galore and you can request data books with all pertinet information. -- Eliot Fenton 72633.3247@compuserve.com From amsoft@epix.net Sun Aug 27 17:29:16 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.cac.psu.edu!news.math.psu.edu!hudson.lm.com!godot.cc.duq.edu!news.duke.edu!usenet From: jimbob@acpub.duke.edu (james P. Meyer) Newsgroups: rec.radio.amateur.homebrew Subject: Schematics from Radio Shack Date: Sat, 26 Aug 1995 12:49:09 GMT Organization: Duke University, Durham, NC, USA Lines: 15 Message-ID: <41na2e$dko@news.duke.edu> NNTP-Posting-Host: async119.async.duke.edu X-Newsreader: Forte Free Agent 1.0.82 Before I spend money on something that may not be what I need, I'll ask for some advise. I've got a used R-S DX-440 that seems to be a bit low in sensitivity on almost all the AM bands including all the SW bands. I could test and probably fix whatever's wrong if I could get decent schematics. Is whatever service manual I might be able to get from R-S going to be halfway decent as far as showing me a full schematic with parts values? If so, what's the R-S part number for the manual? Jim "no sig" Meyer From amsoft@epix.net Sun Aug 27 17:29:17 1995 Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet From: russ@gslink.net (Russ Leblanc) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematics from Radio Shack Date: 27 Aug 1995 18:44:34 GMT Organization: Hurricane DX Club Lines: 26 Message-ID: <41qeei$1l7@ddi2.digital.net> References: <41na2e$dko@news.duke.edu> NNTP-Posting-Host: @204.215.242.151 X-Newsreader: WinVN 0.90.4 In article <41na2e$dko@news.duke.edu>, jimbob@acpub.duke.edu (james P. Meyer) says: > > > Before I spend money on something that may not be what I need, I'll >ask for some advise. > > I've got a used R-S DX-440 that seems to be a bit low in sensitivity >on almost all the AM bands including all the SW bands. I could test >and probably fix whatever's wrong if I could get decent schematics. >Is whatever service manual I might be able to get from R-S going to be >halfway decent as far as showing me a full schematic with parts >values? If so, what's the R-S part number for the manual? They can get it for you from their service department. Make sure you ask for THE SERVICE MANUAL, NOT THE OWNER'S MANUAL or else the bonehead will screw up and send you the wrong one (like they did to me for a DX390). Your 440 is probably suffering from a weakened or blown 1st RF amp due to static pickup or nearby lightning strikes, and is typical on shortwave portables that lack a protective diode network in the antenna input circuit ahead of the RF amp. You could try tracing the circuit from the whip/ant jack to find the transistor, and replace it. You might also try asking on the rec.radio.shortwave newsgroup or the Fidonet shortwave conference, where this has been discussed in the past. Russ From amsoft@epix.net Sun Aug 27 17:29:18 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!EU.net!CERN.ch!sp065!bohl From: bohl@sp065.cern.ch (Thomas Bohl) Subject: Search spare part for Mini Circuits wideband amplifier X-Nntp-Posting-Host: sp065.cern.ch Message-ID: Sender: news@news.cern.ch (USENET News System) Organization: CERN European Lab for Particle Physics X-Newsreader: NN version 6.5.0 #7 (NOV) Date: Fri, 25 Aug 1995 14:26:26 GMT Lines: 10 Dear colleagues, does anybody know what type of transistor is used in the final stage of the Mini Circuits wideband amplifier ZHL-1042-J ? 73 de Thomas, F5SWE Th.Bohl@cern.ch From amsoft@epix.net Sun Aug 27 17:29:18 1995 Path: grape.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news From: Jim Strohm Newsgroups: rec.radio.amateur.homebrew Subject: Re: Search spare part for Mini Circuits wideband amplifier Date: 25 Aug 1995 15:58:16 GMT Organization: UniSQL, Inc. Lines: 14 Message-ID: <41kruo$e8r@unisql.unisql.com> References: NNTP-Posting-Host: blazer.unisql.com X-Newsreader: NCSA Mosaic Thomas Bohl writes: > > does anybody know what type of transistor is used in the final > stage of the Mini Circuits wideband amplifier ZHL-1042-J ? > Mini-Circuits P.O. Box 350166 Brooklyn NY 11235-0003 USA 718-934-4500 718-332-4661 fax Those people should know. From amsoft@epix.net Sun Aug 27 17:29:19 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Search spare part for Mini Circuits wideband amplifier Date: Fri, 25 Aug 95 18:21:46 GMT Organization: TSE Systems Lines: 25 Message-ID: <41l4ag$2e4@solaris.cc.vt.edu> References: <41kruo$e8r@unisql.unisql.com> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us X-Newsreader: News Xpress Version 1.0 Beta #4 In article <41kruo$e8r@unisql.unisql.com>, Jim Strohm wrote: >Thomas Bohl writes: >> >> does anybody know what type of transistor is used in the final >> stage of the Mini Circuits wideband amplifier ZHL-1042-J ? >> > >Mini-Circuits >P.O. Box 350166 >Brooklyn NY 11235-0003 USA >718-934-4500 >718-332-4661 fax I think it is an Avantek GaAS FET of some type. We had one of those amplifiers blow out (several stages bad, burned resistors, etc) a few years ago, and sent it back to Mini-Circuits. As they judged it "beyond repair", they they traded it for a new one for about half the price of a new one (still expensive!). I don't know if they still do that or not. -Mike KD4QDM From amsoft@epix.net Sun Aug 27 17:29:20 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!swrinde!sgigate.sgi.com!sdd.hp.com!hp-pcd!hpcvsnz!tomb From: tomb@lsid.hp.com (Tom Bruhns) Subject: Re: spark tx and VLF etc Sender: news@hpcvsnz.cv.hp.com (News ) Message-ID: Date: Thu, 24 Aug 1995 18:48:40 GMT References: <9508241339.AA05557@alpha.luc.ac.be> Nntp-Posting-Host: hplsnb.lsid.hp.com Organization: Hewlett-Packard X-Newsreader: TIN [version 1.1 PL9.4] Lines: 49 Duncan Cadd (dcadd@luc.ac.BE) wrote: : Greetings, all, from a warm and sunny Diepenbeek in N.E. Belgium ! : " The really big VLF transmitters weren't sparks. They were AC generators : that worked at RF frequencies (or with mag amp frequency multipliers). : Or were hydrogen arc transmitters that were negative resistance oscillators : much like a multikilowatt neon lamp. Both of which output CW, as opposed : to the damped wave from a spark transmitter. : I sure wouldn't want to hang around the keying relays when one of those : things was sending. : Mark Zenier mzenier@eskimo.com mzenier@netcom.com " : If I recall correctly, the AC generators went by a name like Amundsen : Alternator, or something similar. They had several hundred pole pieces, : rotated at high rpm and had an output of the order of 20-30kc/s. Two remain : in existence in the world, one in Scandinavia, I think Sweden, which is : occasionally wound up to show visiting statesmen (not hams who might understand : it !) and the other is on the Eastern seabord of the USA somewhere, I think - : and is fully operational, only closed down in the 1960s. There was an issue : of "Morsum Magnificat" a couple of years ago which carried an article on : these old wonders. : Hydrogen arcs I confess ignorance of ! If someone would enlighten me, I'd : like to be less ignorant ! For folk who might have a casual interest in early transmitter (and receiver) technology, look for issues of "Electronics World + Wireless World" magazine from the UK. Three articles I found that were interesting: "Marconi's 200kW Transatlantic Transmitter," Jan. 1994, Pg. 29. This was a CW SPARK (not alternator) transmitter. There were amplitude ripples, but apparently not a huge percentage. "The Spark That Gave Radio to the World," Nov. 1993, Pg. 937. This article mentions spark transmitters up to 300kW, and possible efficiencies up to 60%. "Germany's Imperial Wireless System," May 1993. From this article, "Before the evolution of high power transmitter valves, there were three ways to generate high power CW: Poulsen's quenched arc, Marconi's timed spark, and radio frequency alternators." 73, K7ITM From amsoft@epix.net Sun Aug 27 17:29:20 1995 Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!news.asu.edu!aztec.asu.edu!jphipps From: jphipps@aztec.asu.edu (JOHN PHIPPS) Newsgroups: rec.radio.amateur.homebrew Subject: Re: spark tx and VLF etc Date: 26 Aug 1995 02:03:58 GMT Organization: Arizona State University Lines: 6 Message-ID: <41lvee$t0j@news.asu.edu> NNTP-Posting-Host: aztec.asu.edu If memory serves me, the lo-frequency alternators were Fendessen, not Amundsen. Amundsen was first at the South Pole - he did it on dog sleds and did not take an alternator with him. John, K7BTA From amsoft@epix.net Sun Aug 27 17:29:21 1995 Path: grape.epix.net!news.sprintlink.net!cs.utexas.edu!convex!news.duke.edu!usenet From: jimbob@acpub.duke.edu (james P. Meyer) Newsgroups: rec.radio.amateur.homebrew Subject: Re: spark tx and VLF etc Date: Sat, 26 Aug 1995 13:01:38 GMT Organization: Duke University, Durham, NC, USA Lines: 17 Message-ID: <41napq$dko@news.duke.edu> References: <41lvee$t0j@news.asu.edu> NNTP-Posting-Host: async119.async.duke.edu X-Newsreader: Forte Free Agent 1.0.82 jphipps@aztec.asu.edu (JOHN PHIPPS) wrote: >If memory serves me, the lo-frequency alternators were Fendessen, >not Amundsen. Amundsen was first at the South Pole - he did it on >dog sleds and did not take an alternator with him. There *was* one guy that went with him to the south pole that *may* have been an "alternator". History just records his first name though, Bruce. Then again, perhaps he was just a flashy dresser. Jim "no sig" Meyer From amsoft@epix.net Sun Aug 27 17:29:22 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!prairienet.org!w9sz From: w9sz@prairienet.org (Zack Widup) Newsgroups: rec.radio.amateur.homebrew Subject: Re: spark tx and VLF etc Date: 26 Aug 1995 22:39:08 GMT Organization: University of Illinois at Urbana Lines: 23 Message-ID: <41o7qc$nc9@vixen.cso.uiuc.edu> References: <41lvee$t0j@news.asu.edu> Reply-To: w9sz@prairienet.org (Zack Widup) NNTP-Posting-Host: firefly.prairienet.org In a previous article, jphipps@aztec.asu.edu (JOHN PHIPPS) says: > >If memory serves me, the lo-frequency alternators were Fendessen, >not Amundsen. Amundsen was first at the South Pole - he did it on >dog sleds and did not take an alternator with him. > >John, K7BTA > Rogger! Reginald Aubrey Fessenden used the low-frequency alternators. From the book OPERATOR'S WIRELESS TELEGRAPH AND TELEPHONE HAND-BOOK by Victor H. Laughter, 1909 (discussing Fessenden's station - with photos and schematics!): "The alternator which is used at the present day runs at a frequency of 80,000 to 100,000 per second, and the disagreeable noise at the receiving end has been entirely eliminated. Such an alternator when run at a frequency of 81,700 per second, gives a voltage of 150 volts open circuit and a field current of 5 amperes." 73, Zack W9SZ From amsoft@epix.net Sun Aug 27 17:29:22 1995 Path: grape.epix.net!news.sprintlink.net!sunic!sunic.sunet.se!seunet!news2.swip.net!news.algonet.se!usenet From: larsa@algonet.se (Lars Andersson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: spark tx and VLF etc Date: 26 Aug 1995 16:45:03 GMT Organization: AlgoNet Public Access Node, Stockholm Lines: 13 Message-ID: <41nj2f$vo@alecto.algonet.se> References: <41lvee$t0j@news.asu.edu> NNTP-Posting-Host: sophocles.algonet.se X-Newsreader: WinVN 0.93.14 jphipps@aztec.asu.edu says... > > >If memory serves me, the lo-frequency alternators were Fendessen, >not Amundsen. Amundsen was first at the South Pole - he did it on >dog sleds and did not take an alternator with him. > >John, K7BTA Or maybe Alexanderson ? Lars, SM0FOE From amsoft@epix.net Sun Aug 27 17:29:23 1995 Path: grape.epix.net!news.sprintlink.net!hookup!news.kei.com!simtel!news1.oakland.edu!jobone!ukma!asuvax!news.asu.edu!aztec.asu.edu!jphipps From: jphipps@aztec.asu.edu (JOHN PHIPPS) Newsgroups: rec.radio.amateur.homebrew Subject: Re: spark tx and VLF etc Date: 27 Aug 1995 06:06:28 GMT Organization: Arizona State University Lines: 3 Message-ID: <41p214$aal@news.asu.edu> NNTP-Posting-Host: aztec.asu.edu Alexanderson?? Maybe.......... Why does that name ring a very faint bell?? From amsoft@epix.net Sun Aug 27 17:29:24 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!interlog.com!news1.fonorola.net!geac!lethe!gts!westonia!ppp-1 From: joe@westonia.com (Joseph Cooper) Subject: Re: spark tx and VLF etc Message-ID: Sender: news@westonia.com Nntp-Posting-Host: ppp-1.ppp.westonia.com Organization: Westonia X-Newsreader: News Xpress Version 1.0 Beta #3 References: <9508241339.AA05557@alpha.luc.ac.be> Date: Sun, 27 Aug 1995 14:26:46 GMT Lines: 58 In article , tomb@lsid.hp.com (Tom Bruhns) wrote: >Duncan Cadd (dcadd@luc.ac.BE) wrote: (Interesting info on VLF Xmiters sniped for space) >: it !) and the other is on the Eastern seabord of the USA somewhere, I think - >: and is fully operational, only closed down in the 1960s. There was an issue >: of "Morsum Magnificat" a couple of years ago which carried an article on >: these old wonders. I have been doing some research on these old VLF transmitters in the U.S., and would be interested to know if someone may have more detailed information on this, and others of its type. In particular I would like to know if anyone knows of archival or book material with pictures of the antenna systems for these stations. I have come across some interesting references to huge systems with antena lengths of nearly one mile and multiple tower with hights of over 600'. At this time the only station that may fit the discription outlined in the original email would be the Navy station NAA at Annapolis. I've seen it and it is impressive. There were stations at Newbrunswick, NJ. Rock Point, N.Y. Sayville N.Y., Marion, Mass. Tuckerton, N.J. that operated into the 1960's. The Newnbrunswick operation was originally a Marconi spark station that was taken over by RCA after WWI. There was also stations at Arlington V.A., Pear Harbor and Challas Heights (a suburb of San Diego) that had a 100kw, 200kw, and 200kw spark transmitters respectivly. Any ideas on these ? There is also a very good book out (who's name I have forgotten) that has a pictorial history of Marconi's huge spark xmitter in England. To give an idea of the scale. First, check out your old ham manuals from the early 1920's and see the diagrams for a spark xmiter. Then upscale it to 100kw. The(as in one)capacitor used was housed in an open two story building. It was composed of metal sheets hung from the ceiling and streached from one wall to the other. There was about 6 feet between each sheet, so a person could walk between them. The rotary spark was kept in a special containment room, and from the pictures shown, 100kw makes a very impressive show. I'll look it up if there is interest. 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 amsoft@epix.net Thu Aug 31 17:09:39 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!skypoint.com!news3.mr.net!mr.net!news.mr.net!usenet From: MRITUNJAY BANSAL Newsgroups: soc.culture.russian,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.antenna,rec.ham-radio,ott.jobs,ott.forsale.other,ott.forsale.computing,ont.jobs,newbridge.rec,newbridge.notice,newbridge.forsale,misc.invest.technical,misc.invest.stocks,misc.invest.canada,bc.jobs,alt.current-events.russia,ab.jobs Subject: Re: $1,800 WEEKLY! MAILING OUR CIRCULARS Date: 28 Aug 1995 21:23:45 GMT Organization: General Mills, Inc. Lines: 8 Message-ID: <41tc51$s51@news.mr.net> References: <41ii92$5ge@news.internetmci.com> <41t2vt$9j6@crchh327.rich.bnr.ca> NNTP-Posting-Host: 146.217.160.7 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: bizsol@magi.com Xref: grape.epix.net rec.radio.amateur.misc:85677 rec.radio.amateur.homebrew:9220 rec.radio.amateur.equipment:16350 rec.radio.amateur.antenna:13412 misc.invest.technical:16112 misc.invest.stocks:68042 misc.invest.canada:14674 alt.current-events.russia:10975 This is just the kind of disgusting commercial crap that we can do without. In a high-tech world it seems, the anarchists could get away with it!!!!! Oh well, anxiety and pleasure I guess do go together. Mritunjay From amsoft@epix.net Thu Aug 31 17:09:41 1995 Path: grape.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!tank.news.pipex.net!pipex!howland.reston.ans.net!math.ohio-state.edu!news.cyberstore.ca!skypoint.com!news3.mr.net!mr.net!news.mr.net!timbuk.cray.com!equalizer!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: gene@ilsi.COM (ILSI) Newsgroups: rec.radio.amateur.homebrew Subject: (no subject) Date: 30 Aug 95 03:55:06 GMT Organization: Internet List Services Inc. Lines: 21 Message-ID: <199508300355.UAA28407@UCSD.EDU> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu We would like to ask you to place a link from your site to our homepage. Please check out our homepage and let us know what you think. We have created a database to assist people that want to advertise on the internet. Using this database, people with homepages will now be able to easily find appropriate sites for links to their homepage. We are Internet List Services Inc. and we would appreciate your help. Please visit us at: http://www.ilsi.com/ilsi5.html Thank you, Gene From amsoft@epix.net Thu Aug 31 17:09:41 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!torn!nott!dgbt!netfs.dnd.ca!nouvelles.e33.dreo.dnd.ca!usenet From: nreed@airsrv.abrdr.dreo.dnd.ca (Norm Reed) Newsgroups: rec.radio.amateur.homebrew Subject: 220 MHz BANDPASS FILTER Date: 29 Aug 1995 17:00:05 GMT Organization: DREO Lines: 11 Message-ID: <41vh2l$6g2@nouvelles.e33.dreo.dnd.ca> Reply-To: nreed@abrdr.dreo.dnd.ca NNTP-Posting-Host: 131.136.36.25 X-Newsreader: WinVN 0.92.3 Does anyone know of a good design of a 220 MHz bandpass filter with a 3dB bandwith of around 5 Mhz or better. I want to use it for a 220 low power transmitter that I am building for high speed packet. I am using a wire over ground design for a 433 MHz bpf and it works great but 220 seems to be more of a problem. Thanks, Norm VE3AJI/VE7ALW From amsoft@epix.net Thu Aug 31 17:09:42 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!in1.uu.net!emi.com!esol.intermedia.com!news From: geotek@cent.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: 220 MHz BANDPASS FILTER Date: Tue, 29 Aug 95 12:56:30 PDT Organization: (None) Lines: 16 Message-ID: References: <41vh2l$6g2@nouvelles.e33.dreo.dnd.ca> NNTP-Posting-Host: 204.149.224.28 Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage In Article<41vh2l$6g2@nouvelles.e33.dreo.dnd.ca>, writes: > Does anyone know of a good design of a 220 MHz bandpass filter with a 3dB > bandwith of around 5 Mhz or better. I want to use it for a 220 low power > transmitter that I am building for high speed packet. I am using a > wire over ground design for a 433 MHz bpf and it works great but 220 seems > to be more of a problem. Use a helical filter from Toko. I have used Toko #271MT-1166A and have great results with the part. Digi-Key has them ( part # TK3601-ND ). They can be retuned a small amount, but be sure you have a sweep generator or network analyzer, they are very sensitive. George Carlson, Geotek Design Services From amsoft@epix.net Thu Aug 31 17:09:43 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!spool.mu.edu!news.nd.edu!news1.oakland.edu!detroit.freenet.org!detroit.freenet.org!am024 From: am024@detroit.freenet.org (Robert Thomas Jackson) Newsgroups: rec.radio.amateur.homebrew Subject: 40 meter TXmitter plans/schem wanted. Date: 30 Aug 1995 18:46:44 GMT Organization: The Greater Detroit Free-Net Lines: 7 Message-ID: <422bmk$pp@detroit.freenet.org> NNTP-Posting-Host: detroit.freenet.org Hi, I'm building the "Rock-Bending Reciever for 7 MHz" that was featured in QST. I want to build a 5 watt companion for the piece. Where can I find/buy plans/schematics for such a beast? I want at least 5 watts out. A kit would be nice! Where can I find such a kit? Who makes them? Anyways, TNX in advance es 73 de KB8UFP Bob. From amsoft@epix.net Thu Aug 31 17:09:44 1995 Path: grape.epix.net!news.sprintlink.net!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: 4CX1500B push-pull amplifer. Date: 31 Aug 1995 12:29:01 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 11 Sender: root@newsbf02.news.aol.com Message-ID: <424o0d$hih@newsbf02.news.aol.com> References: <424ds7$3gl@news.iadfw.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <424ds7$3gl@news.iadfw.net>, jfriley@iadfw.net (J. Fred Riley) writes: > >Push pull operation sounds like a way to start a diathermy machine. >But not an amplifier. > >Fred WA8America Jikabo Nickabo swoooosh swoooosh swoooooosh. Hey Fred you even get QRMed on the net Tom From amsoft@epix.net Thu Aug 31 17:09:45 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!news3.insinc.net!newsfeed.direct.ca!newsfeed.internetmci.com!tank.news.pipex.net!pipex!uknet!bcc.ac.uk!news From: davek@medphys.ucl.ac.uk (Dave Kirkby) Subject: 4CX1500B push-pull amplifer. Sender: news@ucl.ac.uk (Usenet News System) Message-ID: <1995Aug30.143816.63323@ucl.ac.uk> Date: Wed, 30 Aug 1995 14:38:16 GMT Reply-To: davek@medphys.ucl.ac.uk Organization: UCL Dept of Medical Physics Lines: 13 I've seen a mention in the VHF/UHF DX book that one can run a pair of 4CX1500B's in a push-pull configuration, like the W1SL design (which is a well known 2m amp, using a pair of 4CX250B's in push-pull, grounded cathode, grids driven). There is however no reference to a design doing this. Has anyone seen one, or no of som done this? Anyone ever got a pair of 4CX1000A's running on 2m ?? Ever tried and like me not done too well? dave kirkby G8WRB. From amsoft@epix.net Thu Aug 31 17:09:46 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!alfa02.medio.net!guysmiley.blarg.com!eskimo!news From: doug@eskimo.com (Doug Brooks) Subject: Beldon Wire Specs X-Nntp-Posting-Host: tia1.eskimo.com Message-ID: Sender: news@eskimo.com (News User Id) Organization: Your Organization X-Newsreader: WinVN 0.93.10 Mime-Version: 1.0 Date: Tue, 29 Aug 1995 04:35:00 GMT Lines: 7 Does Beldon Have an internet site where they post the specs for the various cables they offer? I want to use some Beldon Ethernet Thinnet for antenna cable and want to compare its specs with other more common beldon cables. Thanks for your help From amsoft@epix.net Thu Aug 31 17:09:47 1995 Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!in1.uu.net!newsflash.concordia.ca!canopus.cc.umanitoba.ca!access.mbnet.mb.ca!slmusr03 From: VE4KLM Newsgroups: rec.radio.amateur.homebrew Subject: building basic SWR meter with coax strip, diode, etc ? Date: Wed, 30 Aug 1995 13:23:07 -0500 Organization: The University of Manitoba Lines: 21 Message-ID: NNTP-Posting-Host: access.mbnet.mb.ca Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Can some one give me a basic schematic or details on how to make a basic SWR meter that I can use for 2 meters and 30 meters ? The one I am looking for is made using a strip of coax, diodes, and a few other miscellaneous parts. I heard about this on a local net, but the details were not given, and no one seems to know who brought it up in the first place. Any help would be appreciated. Email me direct at slmusr03@slmsoft.ca if you can. Regards, VE4KLM --------------------- | SLM Software Inc. | | slmusr03@SLMSoft.CA | --------------------- From amsoft@epix.net Thu Aug 31 17:09:47 1995 Path: grape.epix.net!news.sprintlink.net!bga.com!news From: you@somehost.somedomain (x) Newsgroups: rec.radio.amateur.homebrew Subject: designs for tube recordingstudio-grade mic preamp Date: 29 Aug 1995 16:41:02 GMT Organization: Your Organization Lines: 8 Message-ID: <41vfuu$o9m@giga.bga.com> Reply-To: majec@bga.com NNTP-Posting-Host: jake-5o.aip.realtime.net X-Newsreader: WinVN 0.92.6+ Any one know a souce for designs of audio pre amps . I want to try my hand a building some mic preamps for recording applications. Old manuals or sourches of schematics would be perfect. Thanks Ed Guinn kb5ruf majec@bga.com From amsoft@epix.net Thu Aug 31 17:09:48 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!prodigy.com!usenet From: WHQA19A@prodigy.com (Arkon Kalashki) Newsgroups: rec.radio.amateur.homebrew Subject: Digital Voice Changer Info - need help Date: 31 Aug 1995 05:42:21 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 8 Distribution: world Message-ID: <423i3t$r44@usenetw1.news.prodigy.com> NNTP-Posting-Host: inugap2.news.prodigy.com X-Newsreader: Version 1.2 Would appreciate it if someone could direct me to plans & specs for a good, high-quality digital voice changer. I had plans for same in a magazine, but have lost it. Would appreciate any help. Mudcat From amsoft@epix.net Thu Aug 31 17:09:49 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!Germany.EU.net!netmbx.de!uriela.in-berlin.de!newsun.netmbx.de!netmbx.netmbx.de!gerhard From: gerhard@netmbx.netmbx.de (Gerhard Hoffmann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Divide by ten front end for frequency counter Date: 29 Aug 1995 19:49:20 GMT Organization: netmbx GbR, Berlin, Germany Lines: 28 Message-ID: <41vr00$6cg@newsun.netmbx.de> References: <40rleh$i0h@pith.uoregon.edu> <415gsd$4l9@bud.shadow.net> NNTP-Posting-Host: netmbx2.netmbx.de In article , Jon Goguen wrote: > >How do you make the divide by four that operates to 3 GHz? I was under >the impression that some sort of frequency conversion scheme was used to >bring high frequencies down prior to the dividers and counters, but direct >division would certainly be a lot easier. > Sony has the CXB1109Q quad ecl flipflop that works until 3.1 GHz typ. and CXB1104 dual FF until 3.2 GHz. The Motorola 10EL33 / 100EL33 is a %4 divider that works until 3800 MHz. It is second sourced by Synergy Semiconductor. Plessey has, among others the SP4908 2.5 GHz %8 prescaler. Most satellite receivers have PLL chips with built-in prescalers that go to 2.6 GHz. Gerhard -- # Gerhard Hoffmann # phone: +49 30 782 02 33 # # Gleditschstr. 79 # fax: +49 30 782 02 63 # # D10823 Berlin # on the air: dk4xp # # Germany # in the air: d-1441, d-kick # From amsoft@epix.net Thu Aug 31 17:09:50 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!newsfeed.internetmci.com!howland.reston.ans.net!tank.news.pipex.net!pipex!uknet!bcc.ac.uk!news From: davek@medphys.ucl.ac.uk (Dave Kirkby) Subject: DOD006 valve - know of it??? Sender: news@ucl.ac.uk (Usenet News System) Message-ID: <1995Aug30.151136.59979@ucl.ac.uk> Date: Wed, 30 Aug 1995 15:11:36 GMT Reply-To: davek@medphys.ucl.ac.uk Organization: UCL Dept of Medical Physics Lines: 10 Many people are aware that there has been a lot of the above tubes flaoting around cheaply. Deos anyone have a data sheet, or can tell me who made em? I've been told thay are like the RCA/Burle 7213/7214, but *not* exactly the same. The data sheet on the 7213 suggest these tubes would work fine on 70cm and perhaps (at a push) on 23cm, but I gather this is not true. Above 2m is tricky, but a 1500W tube at 2m is not to be sneesed at. dave Kirkby G8WRB. From amsoft@epix.net Thu Aug 31 17:09:51 1995 Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!gatech!howland.reston.ans.net!math.ohio-state.edu!jussieu.fr!univ-lyon1.fr!swidir.switch.ch!scsing.switch.ch!elna.ethz.ch!usenet From: Essam Badreddin Newsgroups: rec.radio.amateur.homebrew Subject: Drake R7- NB -filter Date: 30 Aug 1995 09:34:37 GMT Organization: Swiss Federal Inst. of Technology Lines: 8 Message-ID: <421bbd$i62@elna.ethz.ch> NNTP-Posting-Host: autmac90.ethz.ch Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-URL: news:rec.radio.amateur.homebrew I would like to place the NB-filter of my R7 after the 2.IF ampli. chain ( just ahead of the 3.Mixer) to limit the broad-band noise. Who knows the termination impedance of this filter? I could estimate it to about 4500 Ohm using the capacitor-transformation ratio of the tuned circuit ahead and behind the filter. What is the exact value? From amsoft@epix.net Thu Aug 31 17:09:54 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uicsl.csl.uiuc.edu!eagle.csl.uiuc.edu!gene From: gene@eagle.csl.uiuc.edu (Gene Gardner) Newsgroups: rec.radio.amateur.homebrew Subject: EASY CB-to-10M SSB Date: 29 Aug 95 23:36:11 GMT Organization: Coordinated Science Laboratory, University of Illinois at Urbana-Champaign Lines: 92 Message-ID: NNTP-Posting-Host: 128.174.58.11 Summary: Describes how to convert CB to 10M SSB Keywords: CB to 10M SSB Conversion CB-band to 10M band....I was pleasantly surprised at how simple it can be. I was especially interested in SSB for 10M since my son just got his Tech-Plus license and can operate on 28.300 MHz to 28.500 MHz SSB (apparently AM is illegal). His "wife's budget" only permitted something "cheap". I bought a couple of "working" SSB CB's for $20 each at a recent Hamfest... Midland model 79-892, and a Cobra 138. The Midland uses a PLL-02A phase- locked loop synthesizer to control the 40 channels, and the older Cobra uses 10 quartz crystal oscillators to control its 23 channels. I suspect there are dozens of other brands that have almost identical design. I remember converting a 23-chan Kraco (AM) many years ago which used a PLL. I was fortunate enough to get service-info (SAMS PHOTOFACTS) thru our local library....CB-180 (April 78) for the Midland, and CB-57 (Sept 74) for the Cobra.It's a good feeling in our throw-away society, to be able to re-cycle some of this great equipment of yester-year. Converting the Midland is quite simple..its PLL has nine control lines capable of divide-by-n (1 to 512). The Midland only needs to divide by 255 thru 211 for Chan-1 thru Chan-40 respectively, so that the 256 line (pin 7) is disabled permanently (grounded). Since a division of at least 211 is needed, the 128 and 64 lines are always enabled (tied to +5), and the remaining six lines (pins 10 thru 15) are switched by the Channel Selector dial to progress- ively lower the count from 255 thru 211. These values may only apply to this model, or perhaps other Midland models.... they depend on choice of VFO and I.F. frequencies, and the down-shifted fre- quencie offered to the PLL, which always divides-by-n to reach 10 KHz which provides phase-locked-loop control, to force the VFO to move in 10 KHz steps. In this particular model for example, on Chan-30 the VFO runs at 38.000 MHz mixed with an I.F. frequency of 10.695 MHz to provide the Chan 30 frequency of 27.305 MHz. (This is a good example because for converting to the Novice band, we will want to start at exactly 1 MHz higher...at 28.305 MHz). In addition, to down-shift the VFO for manageable frequencies for the PLL, it mixes it with a fixed 40.210 MHz for a difference of 2.210 MHz (on chan 30). Dividing this down to 10 KHz requires a divide-by-n of 221....of which div-by-192 is perm- anently wired as described above (pin 7 LO, pins 8 & 9 HI), so that only an additional div-by-29 is needed and the Channel selector knob supplys this (on chan 30) by grounding pins 10 and 14, and enabling (to +5) pins 11, 12,13 and 15. Pins 7 thru 15 represent div-by: 256, 128, 64, 32, 16, 8, 4, 2 and 1, res- pectively. As a side note, many people do not realize that below Chan 20, there are five places that adjacent Channels actually jump 20 KHz, instead of 10KHz: ...i.e. between 3 & 4, 7 & 8, 11 & 12, 15 & 16, 19 & 20 ....all are separ- ated by 20 kHz. The remaining channels thru Chan 40 all have 10KHz separation. I hope all this expanded theory will be helpful in analyzing some of the various models on the market. GETTING BACK TO HOW SIMPLE IT WAS TO MODIFY MY Midland 79-892, all I had to do was cut the PC-board foil to pin 8, then connect pin 8 to pin 7 (which was already grounded). Then tweak the slug on the VFO counter-clockwise to raise its frequency to 39.000MHz which raises the operating frequency to 28.305 MHz as mentioned above....but if you are expecting to receive or transmit on 28.305 MHz, the Chan selector needs to be on Chan-6. The VFO can is the largest shielded-can about 5/8" x 1 1/8"...much larger than any others...with the ferrite slug on top. Operation will not "pop in" until you tweak the VFO near enough for the dc control voltage to capture contol of the VFO. Until then, an out-of-lock signal will disable the system. You can measure the dc control voltage coming out of the PLL (IC-1, pin 5), and tweak the VFO until this control-voltage centers at about 3.5v on Chan-12 (about the middle of the Novice band) although it's not critical. If you plan to operate higher than 28.500 MHz, you might want to center it on a higher channel. To summarize the theory of this example on the low end of the Novice band: VFO is at 39.000 MHz (1 MHz above CB-chan 30) and mixes with I.F. freq. of 10.695 MHz for a difference of 28.305. For phase control, the 39.000 is also mixed with a 40.210 MHz reference for a difference of 1.210 MHz which requires a div-by-121 to reach 10 KHz. We had to ground pin 8 to avoid a minimum count of 128 (we need 121 or less). We still have fixed divisor of 64 (pin 9 tied HI), so the selector channel needs to supply an additional 57 which it does in Chan-6 position by switching pins 10, 11, 12, 15 HI, and grounding 13 & 14. After these two simple changes, the radio came to life immediately. However since I had the SAMS book with all the pictures to identify components, I went thru and tweaked up the circuits that now operate at higher frequencies. It did as you would expect improve considerably. Those without documentation will need to proceed carefully. The inductors near the RF Power out and its driver should be easy to identify without docs. Finally, I also mentioned an older 23-Chan Cobra model 135. I have not changed it over yet, but in analyzing the documentation, I feel certain it would be easy to convert by simply replacing quartz crystal X10 (8.409 MHz) with one 9.5 to 9.67 MHz ...a single crystal would provide four operating frequencies. Each new crystal in that range would offer four more operating frequencies. In this model, the sum of two crytals (one from each group) combined with the 7.8 MHz I.F. yields the operating frequency. Both models have the "clarifier" function in Receive, which shifts operating frequency plus or minus....perhaps filling in most of the gaps in the channels separated by only 10 KHz. If desired, it should be an easy task to modify this same circuit to include shifting the Xmit frequency also. I FORGOT TO MENTION that on the Midland modification, Chan-21 on the selector yields the High end of the Novice band at 28.495 MHz. The dial limits should be marked clearly, or perhaps a physical-stop on the older dials if only the Novice band is intended. -- Internet, BITNET: gene@csl.uiuc.edu From amsoft@epix.net Thu Aug 31 17:09:55 1995 Path: grape.epix.net!news.sprintlink.net!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: Neon lamp question Date: 29 Aug 1995 13:48:51 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 27 Sender: root@newsbf02.news.aol.com Message-ID: <41vju3$1p2@newsbf02.news.aol.com> References: <41v2ko$e8u@ixnews3.ix.netcom.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <41v2ko$e8u@ixnews3.ix.netcom.com>, jeffa@ix.netcom.com (Jeff Anderson) writes: > My questions are: > > 1. Do all neon lamps have this same "ON" voltage? If > not, are there standard "ON" voltages? > > 2. Where can I find information on the "ON" voltage? > (I've looked in my Allied Electronics catalog, but > it was no help). > >Thanks, > >- Jeff, WA6AHL > > Jeff, No, they do not all have the same on voltage and yes there are some common voltage lamps. You will have to look at the data from the lamp manufacturer to get the on voltage, measure it, or find someone with the data. My neon lamp catalogs are probably long gone now, but I will look over the next day. Do you know the bulb number (like NE-2 or NE-1-- Etc?) 73 Tom From amsoft@epix.net Thu Aug 31 17:09:55 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!news.iii.net!iii1.iii.net!not-for-mail From: sefranek@iii1.iii.net (Thomas C Sefranek) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Neon lamp question Date: 31 Aug 1995 13:12:20 -0400 Organization: iii.net Lines: 14 Message-ID: <424qi7$je9@iii1.iii.net> References: <41v2ko$e8u@ixnews3.ix.netcom.com> NNTP-Posting-Host: iii1.iii.net Neon lamps are normally ignited by about 83 volts. However several external/internal sources can cause them to ionize with lower voltages. Incident light, rf fields, radiation... Some lamps have a micro radiation souce embeded in the lamp to stabilize the ignition voltage. These are almost all lower than the 83 volt level. The military lamps with an internal source often have/had warnings about their disposal. Perhaps this will help your problem in some way. Tom -- Thomas C. J. Sefranek WA1RHP Work: 508-425-2200 From amsoft@epix.net Thu Aug 31 17:09:57 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier From: mzenier@netcom.com (Mark Zenier) Subject: Re: spark tx and VLF etc Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: <9508241339.AA05557@alpha.luc.ac.be> Date: Mon, 28 Aug 1995 19:58:26 GMT Lines: 29 Sender: mzenier@netcom9.netcom.com in , Joseph Cooper wrote: : I have been doing some research on these old VLF transmitters in the U.S., and : would be interested to know if someone may have more detailed information on : this, and others of its type. : At this time the only station that may fit the discription outlined in the : original email would be the Navy station NAA at Annapolis. I've seen it and it : is impressive. I dug out an old book I've got (circa 1928) and it says that NAA was a 500 kW arc transmitter, and the US Navy had a 1,000 kW arc transmitter at Bourdeaux, France. No more details than that, though. As far as sending morse with an arc, it seems like there were more ways to do it than there were parts in the transmitter. Back Shunt keying used a seperate non raditating tuned circuit and keying switched the arc voltage between the antenna circuit and the back shunt circuit. Ignition keying used additional electrodes in the arc chamber to turn the arc on and off. Compensation keying varied the inductance of the antenna circuit which caused a frequency shift. And Chopper keying used a motor driven chopper-commutator in addition to the key to either cause a frequency or amplitude modulation at an audio rate. Keeping one of these things operating must have been a chore. Making sure the gap in the arc chamber was ok, the alcohol drip, the water cooling, the antenna loading, ... At least the radio room would have been warm. Mark Zenier mzenier@eskimo.com mzenier@netcom.com From amsoft@epix.net Thu Aug 31 17:09:58 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!bloom-beacon.mit.edu!news5.ner.bbnplanet.net!news3.near.net!bigboote.WPI.EDU!duck.WPI.EDU!jmhill From: jmhill@duck.WPI.EDU (Jonathan M Hill) Newsgroups: rec.radio.amateur.homebrew Subject: Re: spark tx and VLF etc Date: 29 Aug 1995 16:25:58 GMT Organization: Worcester Polytechnic Institute Lines: 21 Distribution: world Message-ID: <41vf2m$19q@bigboote.WPI.EDU> References: <41p214$aal@news.asu.edu> <41rj74$51c@srvr1.engin.umich.edu> NNTP-Posting-Host: duck.wpi.edu A few yeas back I visited Acadia National Park on Mount Desert Island in Maine, USA. In the park visitor's center I purchased a small booklet that described a radio station that was operated by the Navy in 1911, on top of Otter Cliffs, which is not too far from Bar Harbor. The station call sign was NBD. I recall from my reading that the station used a quenched spark gap, essentially alcohol was dripped right into the spark gap..... Oh by the way, Worcester Polytechnic Institute (WPI) became active with a ham radio club in 1909. The club was licensed in 1913 as ``1YK,'' today we are W1YK, so if you come accross either call sign in your literature, thats us. I think that MIT and a small number of other schools also were active at that time, maybe Rensellaer? One story goes that back in those days the electrical engineering department at WPI had a working trolley car. The ham radio clu which was in the same building, connected their transmitter directly to the feedline used by the trolley car. I am not the club historian, so sorry I am not up on all the history. Things at WPI are quite different today than they were back then! Lastly, I recall hearing about a wireless and steam engine museum in Rhode Island. If I manage to find the brochure, I'll make a posting. 73s, Jonathan Hill/N1QOL From amsoft@epix.net Thu Aug 31 17:10:00 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uicsl.csl.uiuc.edu!eagle.csl.uiuc.edu!gene From: gene@eagle.csl.uiuc.edu (Gene Gardner) Newsgroups: rec.radio.amateur.homebrew Subject: EASY CB-to-10M SSB Date: 29 Aug 95 23:36:11 GMT Organization: Coordinated Science Laboratory, University of Illinois at Urbana-Champaign Lines: 92 Message-ID: NNTP-Posting-Host: 128.174.58.11 Summary: Describes how to convert CB to 10M SSB Keywords: CB to 10M SSB Conversion CB-band to 10M band....I was pleasantly surprised at how simple it can be. I was especially interested in SSB for 10M since my son just got his Tech-Plus license and can operate on 28.300 MHz to 28.500 MHz SSB (apparently AM is illegal). His "wife's budget" only permitted something "cheap". I bought a couple of "working" SSB CB's for $20 each at a recent Hamfest... Midland model 79-892, and a Cobra 138. The Midland uses a PLL-02A phase- locked loop synthesizer to control the 40 channels, and the older Cobra uses 10 quartz crystal oscillators to control its 23 channels. I suspect there are dozens of other brands that have almost identical design. I remember converting a 23-chan Kraco (AM) many years ago which used a PLL. I was fortunate enough to get service-info (SAMS PHOTOFACTS) thru our local library....CB-180 (April 78) for the Midland, and CB-57 (Sept 74) for the Cobra.It's a good feeling in our throw-away society, to be able to re-cycle some of this great equipment of yester-year. Converting the Midland is quite simple..its PLL has nine control lines capable of divide-by-n (1 to 512). The Midland only needs to divide by 255 thru 211 for Chan-1 thru Chan-40 respectively, so that the 256 line (pin 7) is disabled permanently (grounded). Since a division of at least 211 is needed, the 128 and 64 lines are always enabled (tied to +5), and the remaining six lines (pins 10 thru 15) are switched by the Channel Selector dial to progress- ively lower the count from 255 thru 211. These values may only apply to this model, or perhaps other Midland models.... they depend on choice of VFO and I.F. frequencies, and the down-shifted fre- quencie offered to the PLL, which always divides-by-n to reach 10 KHz which provides phase-locked-loop control, to force the VFO to move in 10 KHz steps. In this particular model for example, on Chan-30 the VFO runs at 38.000 MHz mixed with an I.F. frequency of 10.695 MHz to provide the Chan 30 frequency of 27.305 MHz. (This is a good example because for converting to the Novice band, we will want to start at exactly 1 MHz higher...at 28.305 MHz). In addition, to down-shift the VFO for manageable frequencies for the PLL, it mixes it with a fixed 40.210 MHz for a difference of 2.210 MHz (on chan 30). Dividing this down to 10 KHz requires a divide-by-n of 221....of which div-by-192 is perm- anently wired as described above (pin 7 LO, pins 8 & 9 HI), so that only an additional div-by-29 is needed and the Channel selector knob supplys this (on chan 30) by grounding pins 10 and 14, and enabling (to +5) pins 11, 12,13 and 15. Pins 7 thru 15 represent div-by: 256, 128, 64, 32, 16, 8, 4, 2 and 1, res- pectively. As a side note, many people do not realize that below Chan 20, there are five places that adjacent Channels actually jump 20 KHz, instead of 10KHz: ...i.e. between 3 & 4, 7 & 8, 11 & 12, 15 & 16, 19 & 20 ....all are separ- ated by 20 kHz. The remaining channels thru Chan 40 all have 10KHz separation. I hope all this expanded theory will be helpful in analyzing some of the various models on the market. GETTING BACK TO HOW SIMPLE IT WAS TO MODIFY MY Midland 79-892, all I had to do was cut the PC-board foil to pin 8, then connect pin 8 to pin 7 (which was already grounded). Then tweak the slug on the VFO counter-clockwise to raise its frequency to 39.000MHz which raises the operating frequency to 28.305 MHz as mentioned above....but if you are expecting to receive or transmit on 28.305 MHz, the Chan selector needs to be on Chan-6. The VFO can is the largest shielded-can about 5/8" x 1 1/8"...much larger than any others...with the ferrite slug on top. Operation will not "pop in" until you tweak the VFO near enough for the dc control voltage to capture contol of the VFO. Until then, an out-of-lock signal will disable the system. You can measure the dc control voltage coming out of the PLL (IC-1, pin 5), and tweak the VFO until this control-voltage centers at about 3.5v on Chan-12 (about the middle of the Novice band) although it's not critical. If you plan to operate higher than 28.500 MHz, you might want to center it on a higher channel. To summarize the theory of this example on the low end of the Novice band: VFO is at 39.000 MHz (1 MHz above CB-chan 30) and mixes with I.F. freq. of 10.695 MHz for a difference of 28.305. For phase control, the 39.000 is also mixed with a 40.210 MHz reference for a difference of 1.210 MHz which requires a div-by-121 to reach 10 KHz. We had to ground pin 8 to avoid a minimum count of 128 (we need 121 or less). We still have fixed divisor of 64 (pin 9 tied HI), so the selector channel needs to supply an additional 57 which it does in Chan-6 position by switching pins 10, 11, 12, 15 HI, and grounding 13 & 14. After these two simple changes, the radio came to life immediately. However since I had the SAMS book with all the pictures to identify components, I went thru and tweaked up the circuits that now operate at higher frequencies. It did as you would expect improve considerably. Those without documentation will need to proceed carefully. The inductors near the RF Power out and its driver should be easy to identify without docs. Finally, I also mentioned an older 23-Chan Cobra model 135. I have not changed it over yet, but in analyzing the documentation, I feel certain it would be easy to convert by simply replacing quartz crystal X10 (8.409 MHz) with one 9.5 to 9.67 MHz ...a single crystal would provide four operating frequencies. Each new crystal in that range would offer four more operating frequencies. In this model, the sum of two crytals (one from each group) combined with the 7.8 MHz I.F. yields the operating frequency. Both models have the "clarifier" function in Receive, which shifts operating frequency plus or minus....perhaps filling in most of the gaps in the channels separated by only 10 KHz. If desired, it should be an easy task to modify this same circuit to include shifting the Xmit frequency also. I FORGOT TO MENTION that on the Midland modification, Chan-21 on the selector yields the High end of the Novice band at 28.495 MHz. The dial limits should be marked clearly, or perhaps a physical-stop on the older dials if only the Novice band is intended. -- Internet, BITNET: gene@csl.uiuc.edu From amsoft@epix.net Thu Aug 31 17:10:01 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!Germany.EU.net!netmbx.de!newsun.netmbx.de!netmbx.netmbx.de!gerhard From: gerhard@netmbx.netmbx.de (Gerhard Hoffmann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: wanted : fast, cheap 200 Mhz PLL Date: 29 Aug 1995 19:21:10 GMT Organization: netmbx GbR, Berlin, Germany Lines: 16 Message-ID: <41vpb6$5mg@newsun.netmbx.de> References: <1995Aug23.020248@rhea.bentley.edu> NNTP-Posting-Host: netmbx2.netmbx.de In article <1995Aug23.020248@rhea.bentley.edu>, wrote: > I need a fast, cheap, phase locked loop. One that can do 200 Mhz or so. >One that is easy to get also. Can anyone recommend one? :-) Try Analog Devices AD9901. Gerhard -- # Gerhard Hoffmann # phone: +49 30 782 02 33 # # Gleditschstr. 79 # fax: +49 30 782 02 63 # # D10823 Berlin # on the air: dk4xp # # Germany # in the air: d-1441, d-kick # From amsoft@epix.net Thu Aug 31 17:10:02 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!solaris.cc.vt.edu!mkeitz From: mkeitz@bev.net (Mike Keitz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: How to make fox hunt target? Date: Tue, 29 Aug 95 19:48:44 GMT Organization: TSE Systems Lines: 75 Message-ID: <41vqq0$kf2@solaris.cc.vt.edu> References: <41vcos$19q@bigboote.WPI.EDU> NNTP-Posting-Host: mkeitz.beve.blacksburg.va.us Keywords: fox, hunt, foxhunt, transmitter, controller X-Newsreader: News Xpress Version 1.0 Beta #4 In article <41vcos$19q@bigboote.WPI.EDU>, jmhill@duck.WPI.EDU (Jonathan M Hill) wrote: >Hi all; > > I am at the very start of the planning of a fox-hunt transmitter >system. I would like to be able to put together in an inexspensive way, >a transmitter for a fox hunt. The transmitter may or may not be attended. >I take it that since the transmitter is acting as a kind of beacon, most >likely in say the 2 meter band, unattended operation should be legal. >Does anyone know for sure? If you classify the transmitter as a "propagation beacon", which seems to me to be the most correct definition of its purpose, 97.203 says it is legal to use under automatic control from 144.275 to 144.300 MHz, as long as the power is less than 100 W, and you aren't in the 'snoop zone' near Green Bank WV. > I have been considering using an old Icom handy-talkie for the >transmitter, does anyone know of any control circuits that could be used >to make an ordinary handy-talkie perform as a fox transmitter? >I have been considering using a Motorolla 68HC11 microcontroller >evaluation board as a fox controller. If anyone has used this or any >other microcontroller, I'd like to hear about it. I believe there is a commercial unit to do just that. On the other hand, it is an excellent introductory microcontroller project. The 68HC11 board will easily handle the tasks of timing the duration of the transmission, generating an ID sequence (in CW internally, or use one of those voice-store chips), and keying the transmitter. The simplest arrangement I can think of, allowing on-off control and FM-MCW modulation would be: 2.2K PORT --------R1-----*--------------------ICOM Micorphone (Tip) | --- --- 0.1 uF 2.2K | PORT------R2--------* | R3 10 ohm | GND-----------------*--------------------ICOM Microphone (Ring) Here, the first PORT, when driven low, will pull current thru R1, turning the transmitter on. (If the microphone jack puts out more than 5V, additional circuitry will be required). The second PORT, driven with an audio frequency square wave, allows tones to be transmitted. The ratio of R2 and R3 sets the level and may need to be adjusted. Another way to do it would be to use a the beacon function of a TNC, this serves the ID and timer functions well, but probably won't transmit long enough to allow anyone to find it. A simple circuit to stretch out the PTT so it transmits a period of dead air after the packet burst may be feasible though. > > If anyone knows of a simple two meter transmitter circuit that I could >use as an actual transmitter, that would be appreciated. With such a circuit, >it would not be necessary to use an actual handy-talkie. Remember that this >is just a fox transmitter and will be limited to CW mode on a single >frequency. Receiver too? Building your own transmitter probably isn't justified unless (1) you would like to, or (2) you consider the possibility of an expensive HT being lost or stolen while left unattended high enough to justify it, or of course (3) you don't have an extra HT. Foxhunting receivers and antennas are another subject altogether. -Mike KD4QDM From amsoft@epix.net Thu Aug 31 17:10:03 1995 Path: grape.epix.net!news.sprintlink.net!gatech!swrinde!sdd.hp.com!hp-pcd!news.vcd.hp.com!news From: Don Huff Newsgroups: rec.radio.amateur.homebrew Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE Date: 29 Aug 1995 19:45:50 GMT Organization: Hewlett-Packard Lines: 5 Message-ID: <41vqpe$rgk@news.vcd.hp.com> References: <41m7tm$ldh@newsbf02.news.aol.com> NNTP-Posting-Host: hpvcldu.vcd.hp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; HP-UX A.09.05 9000/720) X-URL: news:NEWTNews.809446184.3348.geotek@geotek.cent.com A PROVEN SOLUTION IS A GRID-DIP METER. I TOO HAVE PUT IT TO GOOD USE IN MY APARTMENT-DWELLING DAYS. MUTES THAT FM SOUND INSTANTLY. BUT, WITH CABLE, IT MAY NOT BE ENUFF SIGNAL TO DO THE JOB. HOWEVER, IF THE CABLE SYSTEM (AND /OR THE TV ITSELF) IS AS LEAKY AS MANY I HAVE SEEN, IT WILL WORK FINE! From amsoft@epix.net Thu Aug 31 17:10:06 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!gatech!udel!rochester!cornellcs!travelers.mail.cornell.edu!news.kei.com!world!news.mtholyoke.edu!news.umass.edu!hamp!aswNS From: aswNS@hamp.hampshire.edu (Albert S Woodhull) Newsgroups: rec.radio.amateur.homebrew Subject: TRW MX12-3 UHF amp info? Date: 30 Aug 1995 00:35:08 GMT Organization: Hampshire College, Amherst MA Lines: 13 Message-ID: <420bns$9nm@gort.oit.umass.edu> NNTP-Posting-Host: newhamp.hampshire.edu X-Newsreader: TIN [version 1.2 PL2] AT a hamfest recntly I got what I hope will turn out to be a good deal on a little amplifier for 440Mhz, which contains a "brick" marked TRW MX12-3 440-470 Mhz. Can anyone send me specs on this circuit? I also need advice on T/R switching for it. (next post) 73, Al N1AW -- Albert S. Woodhull, Hampshire College, Amherst, MA awoodhull@hamp.hampshire.edu woodhull@shaysnet.com 413-549-2962 From amsoft@epix.net Thu Aug 31 17:10:07 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!nobody From: mikeh@sdd.hp.com (Mike Hoggatt) Newsgroups: rec.radio.amateur.homebrew Subject: Plans for solid state HF Linear Date: 29 Aug 1995 23:14:56 GMT Organization: Hewlett-Packard, San Diego Division Lines: 5 Distribution: world Message-ID: <42071g$oeq@news.sdd.hp.com> NNTP-Posting-Host: hpsdlei5.sdd.hp.com Anybody know a source or have plans for solid state HF Linear amp (10M thru 80M) in the 600 watt range? tnx Mike, KN6IP From amsoft@epix.net Thu Aug 31 17:10:08 1995 Path: grape.epix.net!news.sprintlink.net!malgudi.oar.net!news.erinet.com!bug.rahul.net!a2i!sierra.net!brockway-d222.sierra.net!user From: tetrault@sierra.net (Robert Tetrault) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Plans for solid state HF Linear Date: Tue, 29 Aug 1995 21:47:48 -0700 Organization: Engineered Solutions Lines: 17 Distribution: world Message-ID: References: <42071g$oeq@news.sdd.hp.com> NNTP-Posting-Host: 204.94.234.222 In article <42071g$oeq@news.sdd.hp.com>, mikeh@sdd.hp.com (Mike Hoggatt) wrote: > Anybody know a source or have plans for solid state HF Linear amp > (10M thru 80M) in the 600 watt range? > > tnx > Mike, KN6IP Write to Communications Concepts for catalog of the Motorola solid state amp projects. One of which is in that power range. Comm Concepts will sell kits and the original Motorola application note. 513 426 8600 vox 513 429 3811 fax Good luck RST From amsoft@epix.net Thu Aug 31 17:10:08 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!prairienet.org!w9sz From: w9sz@prairienet.org (Zack Widup) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Plans for solid state HF Linear Date: 30 Aug 1995 13:38:32 GMT Organization: University of Illinois at Urbana Lines: 26 Message-ID: <421pko$nbh@vixen.cso.uiuc.edu> References: <42071g$oeq@news.sdd.hp.com> Reply-To: w9sz@prairienet.org (Zack Widup) NNTP-Posting-Host: firefly.prairienet.org > >> Anybody know a source or have plans for solid state HF Linear amp >> (10M thru 80M) in the 600 watt range? >> >> tnx >> Mike, KN6IP > >Write to Communications Concepts for catalog of the Motorola solid state >amp projects. One of which is in that power range. Comm Concepts will >sell kits and the original Motorola application note. > >513 426 8600 vox >513 429 3811 fax > >Good luck >RST > Also, get a copy of MOTOROLA RF DEVICES MANUAL (2 volumes now.) Many of the application notes deal with solid state amps and combiners to get larger powers out. I'm not sure if CCI has them, but I know RF Parts in San Marcos, CA does. Their phone # is 1-800-737-2787. Zack W9SZ From amsoft@epix.net Thu Aug 31 17:10:10 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!world!news.mtholyoke.edu!news.umass.edu!hamp!aswNS From: aswNS@hamp.hampshire.edu (Albert S Woodhull) Newsgroups: rec.radio.amateur.homebrew Subject: T/R switching 440Mhz brick Date: 30 Aug 1995 00:50:00 GMT Organization: Hampshire College, Amherst MA Lines: 33 Message-ID: <420cjo$9nm@gort.oit.umass.edu> NNTP-Posting-Host: newhamp.hampshire.edu X-Newsreader: TIN [version 1.2 PL2] I have a little 440 Mhz amplifier that uses an integrated "brick" amplifier that was removed from some kind of equipment (so said the OAOAseller). I need a T/R switch to make it really usable. I had a Heathkit 2 meter amp that did T/R switching using 1/4 wave lines connected across input and output and connected together and to some diodes at the other end: in o-O===================-------====================O-o out | | | | v --- V v amplifier input ^ --- amplifier output | | ___ ___ /// /// The idea is that the diodes effectively short the middle to ground when r.f. is present and the 1/4 wave sections are isolated, but it is just a 1/2 wave when receiving. I would like to do something like this at 440 Mhz, but I don't know exactly what design considerations I need to consider or how to test it's really working right. I don't want to blow up my amplifier. Suggestions would be appreciated. 73, Al N1AW -- Albert S. Woodhull, Hampshire College, Amherst, MA awoodhull@hamp.hampshire.edu woodhull@shaysnet.com 413-549-2962 From amsoft@epix.net Thu Aug 31 17:10:11 1995 Path: grape.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.uoregon.edu!newsadmin From: Gary Davis Newsgroups: rec.radio.amateur.homebrew Subject: Home-made low Ohm resistors Date: 30 Aug 1995 00:35:38 GMT Organization: University of Oregon Lines: 16 Message-ID: <420boq$j5f@pith.uoregon.edu> NNTP-Posting-Host: cisco-ts5-line32.uoregon.edu I am building a high-amp, variable voltage power supply. The heart of the circuit is a LM317T voltage regulator, followed by several series pass transistors (2N3055). The output of each transistor should be followed by a .05 Ohm, 2 watt resistor. Such resistors are not readily available at Radio Shack. Can anyone give me advice on how to custom build such resistors? I have many high ohm, high watt resistors, but need to know how many wraps of wire around the resistors are needed for .05 ohms? Your help will be appreciated. Thanks, Gary Davis From amsoft@epix.net Thu Aug 31 17:10:11 1995 Path: grape.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: Home-made low Ohm resistors Date: 30 Aug 1995 02:23:14 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 24 Sender: root@newsbf02.news.aol.com Message-ID: <42104i$i0j@newsbf02.news.aol.com> References: <420boq$j5f@pith.uoregon.edu> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <420boq$j5f@pith.uoregon.edu>, Gary Davis writes: > >Can anyone give me advice on how to custom build such resistors? >I have many high ohm, high watt resistors, but need to know how >many wraps of wire around the resistors are needed for .05 ohms? > >Your help will be appreciated. > >Thanks, > >Gary Davis Gary, In a power supply I designed commercially, I used long foil traces to generate the resistance required. Perhaps you could use long emitter hookup wires. 50 milliohms is not that hard to get either way. Another nice thing is if a transistor hogs current, the resistance of the conductor in it's emitter goes up a bit. That helps keep the current more even. Sometimes temperature instability in a component can be a blessing. 73 Tom From amsoft@epix.net Thu Aug 31 17:10:12 1995 Path: grape.epix.net!news.sprintlink.net!dispatch.news.demon.net!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Home-made low Ohm resistors Date: Thu, 31 Aug 95 05:45:46 GMT Lines: 20 Message-ID: <809848005.15919@pinetree.microserve.com> References: <420boq$j5f@pith.uoregon.edu> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 Gary Davis wrote: >The output of each transistor should be followed by a .05 Ohm, 2 watt >resistor. Such resistors are not readily available at Radio Shack. Rather than building these, why not use emitter resistors, commonly sold for use in high-power audio amplifiers? These resistors are usually available in values down to 0.1 ohm, and power levels of 1 watt and up. Two of these in parallel would provide the value you're looking for. One supplier to check is MCM Electronics in Centerville, OH. Their number is (800) 543-4330, or for product questions, (800) 824-8324. They also offer a free catalog. 73, Jack WB3U From amsoft@epix.net Thu Aug 31 17:10:13 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!night.primate.wisc.edu!newsspool.doit.wisc.edu!news.doit.wisc.edu!runcible.macc.wisc.edu!rsmith From: rsmith@runcible.macc.wisc.edu (Rusty Smith) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Home-made low Ohm resistors Date: 31 Aug 1995 17:34:29 GMT Organization: DoIT Lines: 20 Distribution: world Message-ID: <424rr5$132i@news.doit.wisc.edu> References: <420boq$j5f@pith.uoregon.edu> NNTP-Posting-Host: runcible.macc.wisc.edu X-Newsreader: TIN [version 1.2 PL2] Gary Davis (gdavis@gladstone.uoregon.edu) wrote: : I am building a high-amp, variable voltage power supply. The heart : of the circuit is a LM317T voltage regulator, followed by several : series pass transistors (2N3055). The output of each transistor should : be followed by a .05 Ohm, 2 watt resistor. Such resistors are not : readily available at Radio Shack. : Can anyone give me advice on how to custom build such resistors? : I have many high ohm, high watt resistors, but need to know how : many wraps of wire around the resistors are needed for .05 ohms? There is an excellent article on just this subject in this month's Monitoring Times. - Rusty Smith Division of Information Technology rsmith@macc.wisc.edu Network Engineering Group rsmith@wiscmacc 1210 W. Dayton St. Rm 3221 University of Wisconsin at Madison Madison WI 53706 (608) 263-6307 From amsoft@epix.net Thu Aug 31 17:10:15 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!gatech!howland.reston.ans.net!newsfeed.internetmci.com!btnet!dispatch.news.demon.net!demon!uknet!bcc.ac.uk!news From: davek@medphys.ucl.ac.uk (Dave Kirkby) Subject: High power VHF/UHF amps - references Sender: news@ucl.ac.uk (Usenet News System) Message-ID: <1995Aug30.142630.88685@ucl.ac.uk> Date: Wed, 30 Aug 1995 14:26:30 GMT Reply-To: davek@medphys.ucl.ac.uk Organization: UCL Dept of Medical Physics Lines: 105 Some time ago someone requested some references on highish power VHF amps. When I started a project, I found a number of references that were useful. Anyone is welcome to the following. By the way, if anyone is aware of any designs for push-pull tetrode amplifers with grounded screens, please please let me know. Any valve, any frequency (even audio)! References. 1) 'Modern Circuit Design For VHF Transmitters', Barber et al, Part 1; CQ November 1965, pages 30 - 34; Part 2 December 1965, pages 40 - 92. 2) 'A 2-KW PEP Amplifier for 144MHz.' Parts 1 and 2, E.L. Meade Jr., QST December 1973, pp 34 - 38 and Janurary 1974 pages 26-33. 3) 'High-Power Grounded-Grid Amplifier for 144MHz.' VHF-UHF Manual, G.R. Jessop, 4th edition, Chapter 5, pages 87 to 94. Radio Society of Great Britain. 4) 'Design data for a Two-Kilowatt VHF linear', R.I.Sutherland, Ham Radio, March 1969, pp6. 5) 'Design an amplifier around the 3CX1200A7', W.J.Byron, Ham Radio December 1987, pages 33 - 42. 6) 'A high power 2m Amplifier Using the new 3CX800A7' D.D.Meacham, QST April 1984, pp 11 to 15. Also see ARRL handbook 1991, chapter 31, pages 46 to 50. 7) 'A 144-MHz Amplifier Using the 8874' R.F.Rinaudo, QST January 1972, pp24 to 29. 8) 'A Grounded-Grid Kilowatt Amplifier for 432 MHz', S.J. Powlishen, QST October 1979, pp 11 - 14. 9) 'Improving the K1F0 8874 432MHz Amplifier', S. Powlishen, QST, July 1987, pp20 - 23. 10) 'A 432-MHz, 1500-watt amplifier', F.J.Merry, Ham Radio, July 1985, pp40 - 46. 11) 'New Ideas for the 2-meter Kilowatt', T.F. McMullen et al, QST February 1971, pages 24 to 30. 12) 'A high-Efficiency 2-Meter Kilowatt', QST February 1960, pp 30 - 33. 13) 'Top-Efficiency at 144Mc. With 4X250Bs' L.D. Breyfogle, QST December 1961, pp 44 - 48. 14) 'High-power amplifier for 144MHz', VHF-UHF Manual, 4th Edition, edited by G.R.Jessop, Radio Society of Great Britain, chapter 5, pages 94 to 96. 15) 'Kilowatt Amplifiers for 50 amd 144Mc.' E.P. Tilton, QST February 1964 pp 11 - 142. 16) 'A practical Kiowatt Amplifier for 432MHz' A.T.Margot, QST August 1964, pp 47 - 50. 17) 'The W1QWJ 432-MC. Kilowatt Amplifer' QST February 1966, pp 11-144. 18) 'Some Hints on Push-Pull 432-MHz Power Amplifiers', Tilton, QST February 1970, pp 44-45. 19) 'A Strip-Line Kilowatt Amplifier for 432MHz' R.T Knadle, Part 1, QST April 1972, pages 49 to 55; Part 2, QST May 1972, pages 59 to 79. See also 'Feedback' QST, July 1972, page 47. 20) 'A Coaxial-Tank Amplifier for 220 and 420Mc.', R.D.Brayley, QST May 1951, pp39. 21)'Using the 4X250B on 144,220 and 432Mc', M.P.Southworth, QST February 1957, pp31 to 132. 22) 'The perseids Powerhouse', C.M. Maer, QST October 1959, pages 33 - 186. 23) 'Dual-Band Stripline Amplifier/Tripler for 144 and 432MHz.' R.T. Knadle, Ham Radio, February 1970, pages 6 to 16. 24) 'VHF/UHF World', by J.Reisent, Ham Radio, January 1985, pp 97, and February 1985 page 38. 25) 'Care and Feeding of Power Grid Tubes' Eimac devision of Varian. 26) 'A Legal-Limit 2-Meter Tetrode Amplifier', The ARRL Handbook, 1991, chapter 31, pages 57 to 72. 27) 'VHF-UHF Manual', 3rd or 4th edition, Radio Society of Great Britain. 28) 'The ARRL UHF/Microwave Experimenters manual',1990, ARRL. 29) 'The UHF Compendium', K.Weiner, Parts 1 and 2, Verlag Rudolf Schmidt, 1982. English edition. 30) 'Parallel 4CX150B Amplifier for 144MHz', S. Gross, QST March 1975, pp 11. 31) 'A three-tube 4CX250B linear amplifier', D. Dobricic, Ham Radio, April 1987, page 63 - 62. 32) 'High-power linear for 1296MHz', P.Laakman, QST August 1968, pp8 - 17 From amsoft@epix.net Thu Aug 31 17:10:16 1995 Path: grape.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!newsfeed.internetmci.com!howland.reston.ans.net!tank.news.pipex.net!pipex!in1.uu.net!emi.com!esol.intermedia.com!news From: geotek@cent.com Newsgroups: rec.radio.amateur.homebrew Subject: RF Bridges Date: Wed, 30 Aug 95 10:01:50 PDT Organization: (None) Lines: 5 Message-ID: NNTP-Posting-Host: 204.149.224.33 Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage Does anyone have any information on the GR 1606A/B or the GR916 RF Bridges. George Carlson, Email geotek@cent.com From amsoft@epix.net Thu Aug 31 17:10:17 1995 Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!newsfeed.internetmci.com!news.msfc.nasa.gov!pendragon.jsc.nasa.gov!ames!news.hawaii.edu!uhunix3!dholmes From: Daniel J Holmes Subject: Re: Jamming LW Radio In-Reply-To: <41kn0p$phu$1@mhadg.production.compuserve.com> X-Nntp-Posting-Host: uhunix3.its.hawaii.edu Content-Type: TEXT/PLAIN; charset=US-ASCII Message-ID: Sender: news@news.hawaii.edu Organization: University of Hawaii References: <41kn0p$phu$1@mhadg.production.compuserve.com> Mime-Version: 1.0 Date: Wed, 30 Aug 1995 17:44:11 GMT Lines: 10 Xref: grape.epix.net rec.radio.amateur.antenna:13491 rec.radio.amateur.homebrew:9253 Jamming is illegal under US regulations. Find another past-time!:( On 25 Aug 1995, David Lees wrote: > Anyone any idea how I could Jam a radio Long Wave radio station > (Atlantic 252 to be accurate)............ > > Please help if you can! > > From amsoft@epix.net Thu Aug 31 17:10:18 1995 Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!news.mathworks.com!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Bob Nuckolls, K0DYH <72770.552@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew,sci.electronics Subject: Looking for RF/Receivers guru Date: 30 Aug 1995 22:34:36 GMT Organization: AeroElectric Connection Lines: 13 Message-ID: <422p1s$7nl$1@mhafn.production.compuserve.com> Xref: grape.epix.net rec.radio.amateur.homebrew:9255 sci.electronics:141669 Looking for an RF guru . . . . I need to design/fabricate the world's worst wide band fm receiver at 1500 MHz. I want to measure the center frequency, deviation (up to +/-350KHz) and demodulate a 28KBits per second data stream from a 2 watt transmitter in the same room! I've got a fair notion of how to synthesize the needed LO signals and pipe them to a mixer/limiter. I still need to develop a concept for an FM discriminator with linear performance out to 350 KHz. Anyone out there have some talents in this arena? Thanks! Bob Nuckolls, K0DYH, Wichita, KS From amsoft@epix.net Thu Aug 31 17:10:19 1995 Path: grape.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!howland.reston.ans.net!vixen.cso.uiuc.edu!uicsl.csl.uiuc.edu!eagle.csl.uiuc.edu!gene From: gene@eagle.csl.uiuc.edu (Gene Gardner) Newsgroups: rec.radio.amateur.homebrew Subject: more on EASY CB-10M SSB option Date: 30 Aug 95 20:10:18 GMT Organization: Coordinated Science Laboratory, University of Illinois at Urbana-Champaign Lines: 30 Message-ID: NNTP-Posting-Host: 128.174.58.11 Summary: adds another option to CB to 10M SSB conversion Keywords: append CB-10M SSB This will append the previous entry called EASY CB to 10M SSB: This offers another nice option if it is to be used on Novice band only (This applies to the Midland 79-892 model). The PLL-02A IC offers the option of moving in 5 KHz steps, by simply grounding pin #4. In this case, pin #8 does not get changed (stays high as it is originally). We need the higher divide-count to reach the 5 KHz phase reference (double the count required on 10KHz). The same instructions changing the VFO still apply. In this case, the 28.305 frequency is not available because of the glitch in selector switch which was necessary to accomodate those "20 KHz step" exceptions. The lowest frequency will now be 28.310 which corresponds to Chan-12. (Technically, 28.300 USB on Chan-11 might be permitted, but I would not advise it). The operating frequency moves in 5 KHz steps as the Channel selector is advanced (except for the 2 or 3 glitches where it advances 10 KHz). But there are not enough switch positions to reach the high end of the Novice band so that Chan-40 corresponds to 28.460 MHz. With the smaller 5 KHZ steps, it is almost certain that the clarifier will fill in the gaps with possible exception of the 10 KHz "glitch" channels. From looking at the schematic it appears to be a simple matter to add a "Delta-Xmit" pot to shift the Xmitting frequency during Xmit only. Replace R-26 (10K) with a 100K pot...using two of its terminals and locate the pot in a convenient location. Run a shielded line to replace R-26. Be sure to verify which end of R-26 is ground. Add a 0.01 ufd across this location. This should work well, because an almost identical circuit is used to place the "receive clarifier" pot remotely in the Hand-mike. ...One small correction in the original article....at one place in the text I mistakenly referred to a Cobra-135. It is model Cobra-138. -- Internet, BITNET: gene@csl.uiuc.edu From amsoft@epix.net Thu Aug 31 17:10:20 1995 Path: grape.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!news.netins.net!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!ee.und.ac.za!iafrica.com!ticsa.com!cstatd.cstat.co.za!aztec.co.za!carlin.aztec.co.za!carlin From: carlin@aztec.co.za (Syd Carlin) Newsgroups: rec.radio.amateur.homebrew Subject: PHONE OFF LINE INDICATOR Date: Wed, 30 Aug 1995 18:35:16 Organization: Aztec Information Management Lines: 8 Message-ID: NNTP-Posting-Host: carlin.aztec.co.za X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] Could someone send me a circuit for an off-line phone indicator that does not require an external power supply but derives its power from the phone line. Send info to my fax number: 27-21-5114457 (South Africa) Thanks Syd Carlin From amsoft@epix.net Thu Aug 31 17:10:21 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!sdd.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need source of custom CERAMIC Filters for 240kHz Date: 31 Aug 1995 18:37:15 GMT Organization: Hewlett-Packard Lines: 20 Message-ID: <424vgr$jbm@hpscit.sc.hp.com> References: <41m39s$hbh@newsbf02.news.aol.com> <1995Aug27.022846.22484@galileo.cc.rochester.edu> <424ii8$7mq@hpscit.sc.hp.com> NNTP-Posting-Host: hpscrj.scd.hp.com In article <424ii8$7mq@hpscit.sc.hp.com>, Richard Karlquist wrote: > > >BTW, on your 240 kHz. filter: did you realize that 252 kHz. is a standard >frequency (it's half of 455)? Both Toko and Murata make that one. >If you can QSY from 240 to 252, you're in business. > >Rick Karlquist N6RK >Hewlett Packard >rkarlqu@scd.hp.com Correction to my previous posting. The standard frequency is 262 kHz. not 252 kHz., and it's no particular relationship to 455 kHz. Does anyone know how 262 came to be a standard IF anyway? Only thing I can figure is it is half of 525, which is the bottom of the AM radio band. Any lower and you'd have a nasty 2nd order crossover spur in the mixer. Rick From amsoft@epix.net Thu Aug 31 17:10:25 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!ix.netcom.com!netnews From: au@ix.netcom.com (au ) Newsgroups: rec.radio.amateur.homebrew Subject: Re: K Beep!<--Rooster Crowing sounds cooler. Date: 31 Aug 1995 19:10:57 GMT Organization: Netcom Lines: 12 Message-ID: <4251g1$279@ixnews3.ix.netcom.com> References: <41odia$m8e@fountain.mindlink.net> NNTP-Posting-Host: ix-eug-or1-24.ix.netcom.com In <41odia$m8e@fountain.mindlink.net> andrew_taylor@mindlink.bc.ca (Andrew Taylor) writes: > >Hello, Id like to build an "roger beep"....can't seem to find >any schematics anyplace. > >Id appreciate it if you can help me out! >thanks >Andrew T >andrew_taylor@mindlink.bc.ca > Boy talk about flame bait! Roger beep in ham area? From amsoft@epix.net Thu Aug 31 17:10:26 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!in1.uu.net!psinntp!psinntp!psinntp!psinntp!voder!nsc!news From: "Al Koblinski (W7XA)" Subject: Re: Power Supply Capacitors Content-Type: text/plain; charset=us-ascii Message-ID: To: a313@Lehigh.EDU Sender: news@nsc.nsc.com (netnews maintenance) Nntp-Posting-Host: akoblinski.nsc.com Content-Transfer-Encoding: 7bit Organization: National Semiconductor, Santa Clara References: <41sa36$1299@ns4-1.CC.Lehigh.EDU> Mime-Version: 1.0 Date: Tue, 29 Aug 1995 00:00:10 GMT X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-Url: news:41sa36$1299@ns4-1.CC.Lehigh.EDU Lines: 8 Yes, They are pretty available at surplus stores. Try Fair Radio, Tucker, etc. I think they advertise in the Ham magazines as well as Popular Electronics type magazines. Radio shack also has some or can order through Allied Radio. 73, Al From amsoft@epix.net Thu Aug 31 17:10:27 1995 Path: grape.epix.net!news.sprintlink.net!dfw.nkn.net!virtual.nkn.net!user From: czuber@nkn.net Newsgroups: rec.radio.amateur.homebrew Subject: Re: Transmitting Loop Antenna Date: Mon, 28 Aug 1995 22:52:21 -0600 Organization: National Knowledge Network Lines: 36 Message-ID: References: <41qtt9$b9f@noc.usfca.edu> NNTP-Posting-Host: 199.171.20.115 In article <41qtt9$b9f@noc.usfca.edu>, "Darius Mostowfi, KE6IL" wrote: > Hi, > > I am building a 3'x3' loop for use on 40m - 15m. Does anyone know a good > source for a split-stator variable cap, about 5-100pf or so? > > Is there anyone out there that can relate any experiences with these > types of antennas? > 73 Darius Darius et al, I built the loop antenna described in 73 Magazine May 1995 issue. It is an octagon shape made of 1/2 inch copper pipe and is about 4 feet in diameter. It calls for a split stator variable (found at a hamfest) for 10-20 meters and homebrew capacitors (made of stacked pieces of pc board and place in parallel) for 30 and 40. I haven't used it on 30 and 40 yet. I have a MFJ 20m SSB rig that puts out 12 watts, maybe. I put the antenna vertically on the ground. My first contact (from Texas) was a 59 into Michigan. On field day I set up for about 45 minutes in the backyard and got two Canadians, and a handful of QSO's including North Carolina, Ohio, Nebraska and California. So it works very well. I don't think it would take high power. But with a heavier capacitor or a vacuum variable and beefier construction it would be great. I'm thinking about making one with a 20-30 foot circumference, 1.5 inch pipe and a vacuum variable for 40, 80 and maybe 160. Any advice on that would be appreciated. 73 Rodger AB5VP From amsoft@epix.net Thu Aug 31 17:10:28 1995 Path: grape.epix.net!news.sprintlink.net!gatech!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!hp-pcd!news.vcd.hp.com!news From: Don Huff Newsgroups: rec.radio.amateur.homebrew Subject: Re: Transmitting Loop Antenna Date: 29 Aug 1995 19:56:35 GMT Organization: Hewlett-Packard Lines: 21 Message-ID: <41vrdj$rgk@news.vcd.hp.com> References: <41qtt9$b9f@noc.usfca.edu> NNTP-Posting-Host: hpvcldu.vcd.hp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; HP-UX A.09.05 9000/720) X-URL: news:czuber-2808952252210001@virtual.nkn.net The larger the circumfrence of your loop, the better it will perform. The efficiency of small loops (6 ft circumfrence on 20m for example, like AEA "Isoloop"), is very poor. Expect 8-10 db below a dipole, if the loop is totally in the clear, and many more db down if in awful locations like next to buildings or (heaven forbid!) in an attic. A circular loop will become self-resonant at about 1/3 wavelength in circumfrence. See latest edition of Kraus's classic book "Antennas" for all the equations you need to understand small loops. An octagon loop for 80 CW with 80 ft circumfrence, using 1 inch copper sweated-joints pipe (about 25 ft diameter, not that large for an 80m antenna), can have over 90 percent radiating efficiency. Not bad for a small sized antenna for that band! Not to mention its low-noise receiving and QRM-nulling capability (easy to mount as rotatable). The Q of an efficient loop is very high. High enough to attenuate the sidebands of a SSB signal. This is the reason that efficient loops require vacuum variable capacitors for tuning. The peak voltage on the capacitor can (and should)exceed 20KV at kilowatt levels of input power. GL, 73, Don W6JL From amsoft@epix.net Thu Aug 31 17:10:29 1995 Path: grape.epix.net!news.sprintlink.net!southwind.net!onyx!nuckolls From: nuckolls@onyx.southwind.net (Medicine River Press Inc.) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Transmitting Loop Antenna Date: 31 Aug 1995 11:34:55 GMT Organization: SouthWind Internet Access, Inc. Lines: 12 Message-ID: <4246ov$r0v@opal.southwind.net> References: <41qtt9$b9f@noc.usfca.edu> NNTP-Posting-Host: onyx.southwind.net X-Newsreader: TIN [version 1.2 PL2] Darius, If you don't have them, go to a library and check the indexes (December issues) of QST. Over the past three or four years, there have been several articles on this topic . . including how to build your own coaxial tuning capacitors. 73's Bob . . . K0DYH From amsoft@epix.net Thu Aug 31 17:10:30 1995 Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!nntpdist.primenet.com!russ From: russ@primenet.com (Russell Gore) Newsgroups: rec.radio.amateur.homebrew Subject: Help with no-code survey.. Date: 29 Aug 1995 02:17:33 GMT Organization: Primenet (602)395-1010 Lines: 22 Message-ID: <41ttbt$cdq@nnrp3.primenet.com> NNTP-Posting-Host: usr5.primenet.com X-Newsreader: TIN [version 1.2 PL2] Thanks for reading this, my name is Russell Gore and I am a student at DeVry Institute of Technology in Phoenix. Part of my technical writing class is a survey, please complete the following survey and mail it back to me at RUSS@PRIMENET.COM thanks.. What class of license do you hold? Do you support the idea of no-code on HF? Why? ****************************************************** Please send answer for the two questions to RUSS@PRIMENET.COM -- ***************************************************************************** Russell Gore WL7AG || Internet: russ@primenet.com 8902 N 19th Ave apt2031 || Packet: WL7AG@K7BUC.AZ.USA.NA Phoenix, AZ 85021 || Compuserve: 72377,2075 ***************************************************************************** Student at DeVry Institute of Technology in Phoenix, Arizona From amsoft@epix.net Thu Aug 31 17:10:31 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: tkomljan@mobility.COM (Komljanec, Tony) Newsgroups: rec.radio.amateur.homebrew Subject: Four-bay dipole array Date: 29 Aug 95 17:20:00 GMT Organization: ucsd usenet gateway Lines: 19 Message-ID: <30434BBE@msgate.mobility.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I have two x Sinclair SRL 210-C2 VHF folded dipole arrays that I would like to phase together to make a C4. Because the mast is not continuous, as in a C4 version, I can't exactly mount the entire antenna above the tower. Rather, the upper two dipoles will extend above the tower for an unrestricted view, while the lower two dipoles will exist on the side of the tower. I'm using TV tower with an 11 inch face. Question: When a mobile signal radiates from the back (tower) side of the lower two dipoles, the upper two dipoles will get a "better" view. Can the lower two dipoles act as a load (through the homebrew 2-way coaxial power divider) and attenuate the desired mobile signal? Rephrased: Will this antenna arrangement work without too many undesired nulls? Regards, Tony, VE3PEP From amsoft@epix.net Thu Aug 31 17:10:32 1995 Newsgroups: rec.radio.amateur.homebrew Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.encore.com!psoper From: psoper@encore.com (Pete Soper) Subject: Maxim source needed and filter cascade question Organization: Encore Computer Corporation Date: Tue, 29 Aug 1995 14:19:18 GMT Message-ID: Sender: news@encore.com (Usenet News) Nntp-Posting-Host: sysgem1.encore.com Lines: 24 Hello Folks, Digikey is out of the MAX295 filter chip (for the state variable filter design featured in "QST" recently). They couldn't predict when they will get more stock. Arrow is out of stock too (and has a minimum quantity of 50 anyway). Could somebody point me to an alternative source for this part that doesn't require a corporate account or large minimum order? Also, any pointers to a a source for the Maxim databook would be great. I'm going with the MAX660 charge pump alternative for the -5 supply but don't have the details for this chip. Maxim's phone number would be greatly appreciated. I'm also building a Wein bridge type notch filter. I can't decide whether to arrange for this to be ahead of or behind the state variable filter when it operates. I can take the empirical approach but wonder if you wise heads out there know if one ordering would be clearly better than another? Regards, Pete ------------------------------------------------------------------------- Pete Soper KS4XG (psoper@encore.com) 919 481 3730/voice 919 481 3868/FAX Encore Computer Corp 901 Kildaire Farm Rd Cary, NC 27511 USA From amsoft@epix.net Thu Aug 31 17:10:33 1995 Path: grape.epix.net!news.sprintlink.net!bga.com!ftp.unisql.com!unisql.unisql.com!news From: Jim Strohm Newsgroups: rec.radio.amateur.homebrew Subject: Re: Maxim source needed and filter cascade question Date: 29 Aug 1995 16:09:59 GMT Organization: UniSQL, Inc. Lines: 13 Message-ID: <41ve4n$o4f@unisql.unisql.com> References: NNTP-Posting-Host: blazer.unisql.com X-Newsreader: NCSA Mosaic Maxim 1-800-998-8800 1-800-722-8266 Distributors: Arrow, Bell, CAM RPC, Digi-Key, Elmo, Hamilton Hallmark, Nu Horizons, and Zeus. In NC and SC, EnVision is your authorized rep. In VA, MicroComp. Good luck Jim N6OTQ From amsoft@epix.net Thu Aug 31 17:10:35 1995 Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: Maxim source needed and filter cascade question Date: Tue, 29 Aug 95 12:36:03 PDT Organization: Northwest Nexus Inc. Lines: 33 Message-ID: References: NNTP-Posting-Host: blv-pm3-ip20.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: > Hello Folks, > > Digikey is out of the MAX295 filter chip (for the state > variable filter design featured in "QST" recently). They couldn't > predict > when they will get more stock. Arrow is out of stock too (and has > a minimum quantity of 50 anyway). > Could somebody point me to an alternative source for this part > that doesn't require a corporate account or large minimum order? > Also, any pointers to a a source for the Maxim databook would be > great. I'm going with the MAX660 charge pump alternative for the -5 > supply but don't have the details for this chip. Maxim's phone number > would be greatly appreciated. Try maxim direct. They will sell small quantities via credit card order. 1(800) 998-8800. You can also get catalog at this number. > > Regards, > Pete > Have a nice day....Jay Wicklund (KI7RH) From amsoft@epix.net Thu Aug 31 17:10:37 1995 Path: grape.epix.net!news.sprintlink.net!in2.uu.net!tank.news.pipex.net!pipex!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk From: Leon Heller Newsgroups: rec.radio.amateur.homebrew Subject: Re: Maxim source needed and filter cascade question Date: Tue, 29 Aug 95 19:38:46 GMT Organization: Home Lines: 30 Message-ID: <809725126snz@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 In article psoper@encore.com "Pete Soper" writes: > Hello Folks, > > Digikey is out of the MAX295 filter chip (for the state > variable filter design featured in "QST" recently). They couldn't predict > when they will get more stock. Arrow is out of stock too (and has a > minimum quantity of 50 anyway). > Could somebody point me to an alternative source for this part > that doesn't require a corporate account or large minimum order? > Also, any pointers to a a source for the Maxim databook would be > great. I'm going with the MAX660 charge pump alternative for the -5 > supply but don't have the details for this chip. Maxim's phone number > would be greatly appreciated. > I'm also building a Wein bridge type notch filter. I can't decide > whether to arrange for this to be ahead of or behind the state variable > filter when it operates. I can take the empirical approach but wonder if > you wise heads out there know if one ordering would be clearly better than > another? Maxim are *very* helpful with sample devices. You shouldn't have any problems getting one of the MAX295s out of them, provided they aren't out of stock, either. 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 amsoft@epix.net Sun Sep 03 19:32:22 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.compulink.com!abyss!lethe!gts!westonia!humnet.humberc.on.ca!hduff Subject: HF QRP wideband amp ??? Newsgroups: rec.radio.amateur.homebrew From: hduff@humnet.humberc.on.ca Date: Tue, 29 Aug 95 20:58:40 EST Message-ID: <7965-227002401@humnet.humberc.on.ca> Organization: HumberNet LSS Lines: 29 I am looking for a proven, known working wideband amplifer design to take a DDS (direct digital synthesis) signal of a few milliwatts up to 3 to 5 watts. Operating range from 1.8 Mhz to 20 Mhz. The amplifier must be stable, solid state with as low a parts count as possible. ( How's that for stingent specs !?) I want to use my DDS as a (nearly) all-band QRP HF transmitter. I will look after the required bandpass filtering. I've seen some designs that will deliver the required power but not a broadband design that will cover most of the HF amateur bands. If you have something that doesn't quite go 1.8 to 20 Mhz, I'd still like to hear about it ! Thanks..Hugh Duff VA3TO Toronto --- þ NFX v1.3 [000] -- --------------------------------------------------------------------- HumberNet LSS (Learning Support System) - Humber College, Toronto "Tomorrow's communication and learning environment, today" Visit our Website at http://humnet.humberc.on.ca/ From amsoft@epix.net Sun Sep 03 19:32:24 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!news.starnet.net!wupost!news1.inlink.com!usenet From: raiar@inlink.com (Gary V. Deutschmann, Sr.) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Neon lamp question Date: 29 Aug 1995 22:08:56 GMT Organization: Inlink Lines: 47 Message-ID: <42035o$38k@news1.inlink.com> References: <41v2ko$e8u@ixnews3.ix.netcom.com> NNTP-Posting-Host: slip11.inlink.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 In article <41v2ko$e8u@ixnews3.ix.netcom.com>, jeffa@ix.netcom.com says... > > > I recently picked up an old HP voltmeter that uses Nixie tubes for >the display (heck, it was cheap). Internally, they use an interesting >scheme of coupling the digital data to the nixies (high voltage) by >using neon lamps and photoconductors - sort of an early optocoupler >design. > > The neon lamps used in this optocoupler are supposed to have an >"ON" voltage of 55 volts dc. I've found that a couple of digits in the >readout "jump" about (from one value to another), and I've traced this >instability back to the neon lamps. Several of their "ON" voltages >have drifted up to the 70 volt range, which, because of the circuit >design, causes instability with a different neon lamp. > > My questions are: > > 1. Do all neon lamps have this same "ON" voltage? If > not, are there standard "ON" voltages? > > 2. Where can I find information on the "ON" voltage? > (I've looked in my Allied Electronics catalog, but > it was no help). > >Thanks, > >- Jeff, WA6AHL Hi Jeff Sorry, I no longer work at a place that has those data tables, but I do remember that most NE lamps operate between 105 to 125 volts, but as you found out their are exceptions. The particular neon lamps you are referring to, and this is a wild guess, are probably numbered NE83, NE86 or 5AH. The NE83 and the 5AH are identical and their operating voltages are between 60 and 100 volts, whereas the NE86 is between 55 and 90 volts and probably the bulb you are looking for. It's life rating is only 2000 hours and therefore needs replacing quite frequently. Have fun finding one! ;-) TTUL Gary - N0ZOI From amsoft@epix.net Sun Sep 03 19:32:24 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!nwlink.com!tsunami.ixa.net!gandalf.compumedia.com!news From: markm@compumedia.com (Mark McDermott) Newsgroups: rec.radio.amateur.homebrew Subject: 900 MHz repeaters Date: Wed, 30 Aug 1995 00:59:33 GMT Organization: Hutton Communications Lines: 8 Message-ID: <420j0j$ufk@gandalf.compumedia.com> NNTP-Posting-Host: rad.compumedia.com X-Newsreader: Forte Free Agent v0.55 Has anyone built a 900 MHz repeater out there, if so what did you use for the RXTX sections? Mark N7TJP -- Mark S. McDermott, P.E. N7TJP email: markm@compumedia.com From amsoft@epix.net Sun Sep 03 19:32:26 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.crl.com!crl14.crl.com!not-for-mail From: dmiller@crl.com (Donald J. Miller) Newsgroups: rec.radio.amateur.homebrew,sci.electronics Subject: Re: Looking for RF/Receivers guru Followup-To: rec.radio.amateur.homebrew,sci.electronics Date: 30 Aug 1995 18:14:19 -0700 Organization: CRL Dialup Internet Access (415) 705-6060 [Login: guest] Lines: 23 Message-ID: <4232db$8v6@crl14.crl.com> References: <422p1s$7nl$1@mhafn.production.compuserve.com> NNTP-Posting-Host: crl14.crl.com X-Newsreader: TIN [version 1.2 PL2] Xref: grape.epix.net rec.radio.amateur.homebrew:9271 sci.electronics:141801 BobNuckolls wrote: : Looking for an RF guru . . . . I need to design/fabricate the world's : worst wide band fm receiver at 1500 MHz. I want to measure the center : frequency, deviation (up to +/-350KHz) and demodulate a 28KBits per : second data stream from a 2 watt transmitter in the same room! I've : got a fair notion of how to synthesize the needed LO signals and : pipe them to a mixer/limiter. I still need to develop a concept for : an FM discriminator with linear performance out to 350 KHz. I don't know if this chip is still in general use today, but the NE568 PLL demod chip from Signetics (Now Phillips) used to be the standard workhorse part for satelite FM Video receivers. The usual IF frequency was 70 MHz, although the databook says that operation at up to 150 MHz is possible. Have fun! -- ------------------------------------------------- Don Miller My opinions are my own! dmiller@crl.com ------------------------------------------------- From amsoft@epix.net Sun Sep 03 19:32:28 1995 Path: grape.epix.net!news.sprintlink.net!nntpgate.primenet.com!news.asu.edu!aztec.asu.edu!ballnt From: ballnt@aztec.asu.edu (John Ballentine) Newsgroups: rec.radio.amateur.homebrew Subject: Re: spark tx and VLF etc Date: 30 Aug 1995 20:09:16 GMT Organization: Arizona State University, Tempe, AZ (USA) Lines: 31 Message-ID: <422ghc$iai@news.asu.edu> References: <9508241339.AA05557@alpha.luc.ac.be> >I dug out an old book I've got (circa 1928) and it says that NAA was a >500 kW arc transmitter, and the US Navy had a 1,000 kW arc transmitter at >Bourdeaux, France. No more details than that, though. >... > >Keeping one of these things operating must have been a chore. Making >sure the gap in the arc chamber was ok, the alcohol drip, the water cooling, >the antenna loading, ... At least the radio room would have been warm. > >Mark Zenier mzenier@eskimo.com mzenier@netcom.com > > There was an article in QST a year or so ago that mentioned some of the arc transmitters. It said the 1 MWatt transmitter was built to maintain communications between the US and the expeditionary force in France in WWI. I got the impression it was never put into use. They mentioned some huge electromagnets that were built for it, that were the largest ever built until well after WWII. They were eventually used in some Physics research project. They also mentioned a problem with the alcohol vapor. If the door to the arc chamber was opened too soon after the arc was turned off, the air rushing in would hit the alcohol vapor and the still hot surfaces and cause a flash of fire. There were cases of radiomen being killed in these fires. -- John Ballentine WB2SNB Divina natura dedit agros, Chandler, Arizona ars humana aedificavit urbes. From amsoft@epix.net Sun Sep 03 19:32:29 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news3.digex.net!digex.net!not-for-mail From: gc@universe.digex.net (Gary Chatters) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Home-made low Ohm resistors Date: 30 Aug 1995 20:52:32 -0400 Organization: Universal Access by Digital Express. 800-969-9090 Lines: 18 Message-ID: <42314g$2l2@universe.digex.net> References: <420boq$j5f@pith.uoregon.edu> NNTP-Posting-Host: universe.digex.net In article <420boq$j5f@pith.uoregon.edu>, Gary Davis wrote: >I am building a high-amp, variable voltage power supply. The heart >of the circuit is a LM317T voltage regulator, followed by several >series pass transistors (2N3055). The output of each transistor should >be followed by a .05 Ohm, 2 watt resistor. Such resistors are not >readily available at Radio Shack. > >Can anyone give me advice on how to custom build such resistors? >I have many high ohm, high watt resistors, but need to know how >many wraps of wire around the resistors are needed for .05 ohms? > The ARRL Handbook has a table of properties of copper wire. For example, 20 guage copper wire has a resistance of 10 milliohms per foot. gc From amsoft@epix.net Sun Sep 03 19:32:29 1995 Path: grape.epix.net!news.sprintlink.net!in1.uu.net!news.iadfw.net!usenet From: jfriley@iadfw.net (J. Fred Riley) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 4CX1500B push-pull amplifer. Date: Thu, 31 Aug 1995 08:34:12 -0700 (PDT) Organization: Internet America Lines: 12 Message-ID: <424ds7$3gl@news.iadfw.net> References: <1995Aug30.143816.63323@ucl.ac.uk> NNTP-Posting-Host: dal06-24.ppp.iadfw.net X-Newsreader: Forte Free Agent v0.38 davek@medphys.ucl.ac.uk (Dave Kirkby) wrote: >Anyone ever got a pair of 4CX1000A's running on 2m ?? There are lots on 100 MHZ and several friends have used them. But only in single-ended service. The 1500B is much better than the 1000A IFF you ever have a parasitic. Push pull operation sounds like a way to start a diathermy machine. But not an amplifier. Fred From amsoft@epix.net Sun Sep 03 19:32:31 1995 Path: grape.epix.net!news.sprintlink.net!nwfocus1.wa.com!news.halcyon.com!usenet From: gfiber@halcyon.com (Gary P. Fiber) Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Re: Computer Control of Icom IC-R7100 Date: 31 Aug 1995 12:16:55 GMT Organization: Northwest Nexus Inc. Lines: 29 Message-ID: <42497n$252@news.halcyon.com> References: <41qoge$i0m@hera.ia.net> NNTP-Posting-Host: blv-pm0-ip13.halcyon.com X-Newsreader: WinVN 0.92.1 Xref: grape.epix.net rec.radio.amateur.digital.misc:10288 rec.radio.amateur.equipment:16484 rec.radio.amateur.homebrew:9276 rec.radio.amateur.misc:85844 In article <41qoge$i0m@hera.ia.net>, pbutlalj@ia.net (Allan Butler) says: > > Hello, > > I have a friend with one of these radios and he would like to >build the interface and program his own computer to control the radio. >The only problem that he has is that he cannot find the protocols that >the radio uses to be controlled. He would like to get the information >that is needed to make the radio listen to the computer commands. He is >most interested in the data bits and the baud rate and what the actual >commands are that need to be sent out the computer serial port. > > Please respond via E-mail and here if you have an answer to this. > He realizes that he could do the solution by throwing money at the >problem but he wishes to do it the old fashioned way and do it himself. >-- > Allan Butler KA0IES Allan, Call ICOM America at 206-454-7619, press " 3 " when the automated system answers. You will then be connected with ICOM's parts dept. They have a manual titles the " CI-V Reference manual " for sale at a cost of about $15.00 plus shipping. This manual has the commands for the IC-R7100. Newer ICOM radios now have the command set for the radio right in the operators manual so it is doubtful the CI-V Reference Manual will ever be updated 73' Gary From amsoft@epix.net Sun Sep 03 19:32:32 1995 Path: grape.epix.net!news.sprintlink.net!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!fnnews.fnal.gov!nntp-server.caltech.edu!news.cerf.net!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Zack Lau Newsgroups: rec.radio.amateur.homebrew Subject: Re: HF QRP wideband amp ??? Date: 31 Aug 1995 13:17:45 GMT Organization: American Radio Relay League Lines: 25 Message-ID: <424cpp$php@mgate.arrl.org> References: <7965-227002401@humnet.humberc.on.ca> NNTP-Posting-Host: mgate.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: hduff@humnet.humberc.on.ca hduff@humnet.humberc.on.ca wrote: > > > >I am looking for a proven, known working wideband amplifer >design to take a DDS (direct digital synthesis) signal of a few >milliwatts up to 3 to 5 watts. >Operating range from 1.8 Mhz to 20 Mhz. The amplifier must be >stable, solid state with as low a parts count as possible. >( How's that for stingent specs !?) > You might consider the 1.8 to 54 MHz 5 watt amplifier in the May 1992 issue of QEX. It uses a MRF 137 running off 28 volts for acceptable IMD performance. Zack KH6CP/1 zlau@arrl.org Sept VHF Contest Mt Equinox FN33KE @3810 ft. 73 7.1W 43 10.0N 50 MHz to 10 GHz SSB/CW/FM Need just a few QSLs for 1296 VUCC... From amsoft@epix.net Sun Sep 03 19:32:33 1995 Path: grape.epix.net!news.sprintlink.net!ddi2.digital.net!usenet From: russ@gslink.net (Russ Leblanc) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NEED HELP MAKING TV OSCILLATOR/JAMMER, SHORT RANGE Date: 31 Aug 1995 20:28:41 GMT Organization: Hurricane DX Club Lines: 27 Message-ID: <42561p$nl@ddi2.digital.net> References: <41m7tm$ldh@newsbf02.news.aol.com> NNTP-Posting-Host: @204.215.242.156 Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.6 In article , ai557@ccn.cs.dal.ca says... > >SHACK 9529 (shack9529@aol.com) wrote: >: DOES ANYONE KNOW HOW TO MAKE AN OSCILLATION CIRCUIT THAT WILL INTERFERE >: WITH TV. MY PURPOSE IS TO USE IT AS A JOKE DURING FOOTBALL GAMES AT A >: FRIENDS HOUSE. >: PLEASE HELP! THANKS > > >KA-f*****g BOOOOOOOOOOOOOOMMMMMMMMMMMMMMMMMMMMMM! > >The stereo never worked again... > >-Jeffy Funny story. A teacher who just happened to be a ham taught a short intro electronics class when I was in sixth grade. The feature project was a tiny transmitter for jamming TV bcasts. He'd instruct us to mount it close to the twinlead and turn it on (this was long before the advent of cable). Of course, he suggested that we offer our services to fix the problem, which consisted of sneakily recovering the jammer and subsequently giving the neighbor a few good lines of techno-babble describing the problem. Thus demonstrating our electronic prowlness and "kindness". From amsoft@epix.net Sun Sep 03 19:32:34 1995 Newsgroups: rec.radio.amateur.homebrew,sci.electronics Path: grape.epix.net!news.sprintlink.net!in2.uu.net!psinntp!psinntp!psinntp!psinntp!atl.com!news From: lewish (Lewis Hughes) Subject: Re: Need info on Moto Hybrid RF Power amp. Message-ID: <1995Aug31.225805.3559@atl.com> Keywords: Moto Hybrid Final RF AMP Sender: news@atl.com Nntp-Posting-Host: atl.com Reply-To: lewish@atl.com Organization: ADI X-Newsreader: WinVN 0.99.2 References: <421u6t$1bq@Mars.mcs.com> Mime-Version: 1.0 Distribution: usa Date: Thu, 31 Aug 1995 22:58:05 GMT Lines: 44 Xref: grape.epix.net rec.radio.amateur.homebrew:9284 sci.electronics:141934 In article <421u6t$1bq@Mars.mcs.com>, willmore@MCS.COM says... > >I've got a few Motorola Hybrid RF Power amplifiers of unknown specification. >They have the pinout of a MHW607, but their part number is XHW5066MOD. Yes, >that's XHW and not MHW. I think that it is the final for a Moto handheld >in the mid VHF band. I would like to use it in the 2m amateur band (144-148). >If it bears any resemblance to the 607, it will put out 7 to 10 Watts. That >would make a great module for homebrew designs. 1mW in, 10 W out! Too bad >it takes > 2A at 7.5V, but I can live with it. :) > >If anyone knows the low down on this, please let me know. Post or Email >are both fine. If there is interest, I'll post the results of my search. >If they prove useful, I'll tell where I got them. > >Thanks for any help! > >Cheers, >David N0YMV The "X" in the part number means it was designed and manufactured by Motorola Japan. Not Motorola USA. If you call Motorola in Arizona, they will deny that such a part exists. I know from past experience with a different kind of part with an "X" prefix on the part number. However, If you persist in asking for other departments in the Arizona facility, you may eventually come across someone who will admit to knowing about the part and can send you a spec sheet. I can't recall the name of the individual I finally talked to, but he was most helpful; all the while claiming that he didn't know anything about it. Hope this helps a little. Regards, Lewis