The World of Ham Radio CD-ROM From amsoft@epix.net Sat Jul 06 13:44:25 1996 From: "Kathryn J. Goerg" Newsgroups: rec.radio.amateur.homebrew Subject: RF/Microwave CAE Site Date: Mon, 01 Jul 1996 13:32:29 -0500 Message-ID: <31D819BD.74B@webblabs.com> The Webb Laboratories RF/Microwave CAE Site is at: http://www.webblabs.com Please inspect our receiver engineering, structure synthesis and active filter design capabilities. Kathy Goerg Webb Laboratories kgoerg@webblabs.com From amsoft@epix.net Sat Jul 06 13:44:26 1996 From: wlfuqu00@service1.UKy.EDU (William L. Fuqua III) Newsgroups: rec.radio.amateur.homebrew Subject: Data on RG-34 coax? Date: 1 Jul 96 13:47:45 GMT Message-ID: <199607011347.JAA27990@service1.cc.uky.edu> Anyone have data on RG-34 coax. It is at least twice the diameter of RG-8. I had seen a listing of data for various coax cables some time ago but lost it . 73 Bill wa4lav was ko4ww From amsoft@epix.net Sat Jul 06 13:44:27 1996 From: rst@tetrault.com (Bob T.) Newsgroups: rec.radio.amateur.homebrew Subject: Re: More toroids Date: Mon, 01 Jul 1996 20:37:58 -0700 Message-ID: References: <9605288359.AA835977661@mails.imed.com> Don't forget that the mix versus frequency differences are really only applicable to tuned circuits where the cores are part of a tank. In broadband applications such as transformers the 43 and 61 materials are capable of operation into the hundreds of MHz, depending on the design. From amsoft@epix.net Sat Jul 06 13:44:28 1996 From: g-aid@lanminds.com Newsgroups: rec.radio.amateur.homebrew Subject: Simple microwave transceiver information Date: Tue, 02 Jul 1996 04:51:58 GMT Message-ID: <31d5fe39.12640494@NEWS.LANMINDS.COM> For practical information on microwave transceiver construction,try to get hold of the "VHF-UHF Manual" by D.S. Evans and G.R. Jessup, published by the Radio Society of Great Britain (their counterpart of thr ARRL). Try your local university/engineering library. Although first published in the 70s, the material is quite relevant for beginners and the book might still be in print. To order, try writing the RSGB at 35 Doughty Street, London WC1N 2AE, England. From amsoft@epix.net Sat Jul 06 13:44:29 1996 From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.homebrew Subject: Re: Simple microwave transceiver information Date: 2 Jul 1996 09:56:48 GMT Message-ID: <4rarp0$3igg@info4.rus.uni-stuttgart.de> References: <31d5fe39.12640494@NEWS.LANMINDS.COM> In article <31d5fe39.12640494@NEWS.LANMINDS.COM>, wrote: >For practical information on microwave transceiver construction,try to >get hold of the "VHF-UHF Manual" by D.S. Evans and G.R. Jessup, >published by the Radio Society of Great Britain For anything but research in amateur radio history the book is largely useless. Even when the current edition came out 10 years ago, some designs given were obsolete. It is well written though and I like it, but I can not recomend it as an introduction. 73, Moritz DL5UH From amsoft@epix.net Sat Jul 06 13:44:29 1996 From: Matthew Halsey Newsgroups: rec.radio.amateur.homebrew Subject: crystal source Date: 2 Jul 1996 12:33:11 GMT Message-ID: <4rb4u7$ufp@intelsat2.intelsat.int> Hi, Does anyone know of a good source of economically priced crystalsa? I have an old PMR radio which I want to crystal up for a local repeater here i n Gaithersburg, MD. Tks & 73s Matt W3/G0IHG matthew.halsey@intelsat.int -- INTELSAT From amsoft@epix.net Sat Jul 06 13:44:30 1996 From: lewissys@ix.netcom.com(Charles E. Lewis) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Help with FOXHOLE RADIO Date: 2 Jul 1996 12:59:14 GMT Message-ID: <4rb6f2$b7b@dfw-ixnews5.ix.netcom.com> A few weeks ago, I casually read some posts about making a foxhole radio using a razor blade as a rectifier. Last weekend, I fell into possession of a Gillette double edge blade with a sky blue finish still in the original wax paper. Is this the type I need? If so, can someone give me enough details to make an authentic one? Also, any documentation, anectdotes, or facts that would help to make it an educational display would be appreciated. 73 de KJ5WA From amsoft@epix.net Sat Jul 06 13:44:32 1996 From: Rolfe Tessem Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Re: OLD A.M. KILLOWATT BROADCAST TRANSMITTER WANTED Date: Tue, 02 Jul 1996 15:54:38 -0400 Message-ID: <31D97E7E.63DE@ldp.com> References: <4qsdrb$d0@chewy.castles.com> <31D218F3.5CFD@worldnet.att.net> <4r3ein$shn@rosebud.ldp.com> <4r69mk$6s@news-2.csn.net> > I am certainly no lawyer -- but, I THINK that the current laws, passed by ou r > wonderful Congress and signed by our wonderful Presidents (Bush/Clinton et. al.) > state that if you sell "contaminated" land that the seller is forever liable for > the cost of cleanup. Therefore -- your PCB laden transmitter leaks; you sell the > land to someone; 20-years from now, 1 part per billion PCB is detected; -- y ou > are liable for $5-million to get the stuff cleaned up. The point is that PCBs that are safely sealed inside transformers or capacitor s are no hazard whatsoever. What do you think is inside all those pole transformers you see up in the air? The PCB problem is that GE dumped tons of the stuff into the Hu dson and Housatonic rivers over a period of years. You are not going to have a PCB problem from a sealed transformer or capacitor, even if one should happen to leak on y our garage floor. I have a number of oil-filled capacitors and transformers and, a lthough I may lose sleep over a lot of things, this is not one of them. Rolfe W3VH -- Rolfe Tessem | Lucky Duck Productions, Inc. rolfe@ldp.com | 96 Morton Street (212) 463-0029 | New York, NY 10014 From amsoft@epix.net Sat Jul 06 13:44:33 1996 From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: 9 Pin Novar Socket Date: 2 Jul 96 16:20:59 GMT Message-ID: <9606028363.AA836328279@mails.imed.com> Someone was recently looking for a Novar socket for a transmitter project. You can get these for (hold your breath) $3.45 at RF parts 435 South Pacific ST San Marcos, CA 92069 There is no minimum but there is a minimum shipping of $2 if you order by check. There is a $25 minimum if you order by phone. The part number for the Novar socket is SK9. Ray Mack WD5IFS mack@mails.imed.com Friendswood (Houston), TX From amsoft@epix.net Sat Jul 06 13:44:34 1996 From: Matthew Halsey Newsgroups: rec.radio.amateur.homebrew Subject: Re: crystal source Date: 2 Jul 1996 17:41:13 GMT Message-ID: <4rbmvp$am@intelsat2.intelsat.int> References: <4rb4u7$ufp@intelsat2.intelsat.int> By the way, the frequencies I require are 12.19625 MHz and 13.13792 MHz. Tnx & 73 Matt W3/G0IHG -- INTELSAT From amsoft@epix.net Sat Jul 06 13:44:35 1996 From: gsparks@ix.netcom.com(Glenn Sparks) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: Help with FOXHOLE RADIO Date: 2 Jul 1996 19:40:49 GMT Message-ID: <4rbu01$jj2@sjx-ixn5.ix.netcom.com> References: <4rb6f2$b7b@dfw-ixnews5.ix.netcom.com> In <4rb6f2$b7b@dfw-ixnews5.ix.netcom.com> lewissys@ix.netcom.com(Charles E. Lewis) writes: The article on this was in Hands on Electronics I think, about 5 years ago. I will see if I still have it. The razor blade is the correct one with one minor detail, the blade needed to be used, with the hot spot being next to the corrosion. Use a pencil lead for the pickup, an old drawing compass is a good way to mount the lead. As for the construction follow any crystal radio direction, make it work with a germanium diode, then replace the diode with the razor blade setup. Good Luck\ Sparky KI5GY > > > A few weeks ago, I casually read some posts about making a foxhole >radio using a razor blade as a rectifier. Last weekend, I fell into >possession of a Gillette double edge blade with a sky blue finish still >in the original wax paper. Is this the type I need? If so, can >someone give me enough details to make an authentic one? Also, any >documentation, anectdotes, or facts that would help to make it an >educational display would be appreciated. > > 73 de KJ5WA From amsoft@epix.net Sat Jul 06 13:44:36 1996 From: Teresa & Paulo Campos Newsgroups: rec.radio.amateur.homebrew Subject: Need Yaesu FRG-9600 Schematic! Date: Tue, 02 Jul 1996 21:19:46 +0100 Message-ID: <31D98462.187F@relay.ua.pt> I have just bought an used Yaesu FRG-9600. I need the schematic for trying to change the intermediate filter or to add an external module for weather sats reception. I would appreciate (and pay expenses) if someone shares it... Thanks and 73, Paulo, CT1EFS campos@relay.ua.pt From amsoft@epix.net Sat Jul 06 13:44:36 1996 From: "Earl Needham, KD5XB, in Clovis, NM" Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Subject: 6/2 Mobile Antenna Date: Tue, 2 Jul 1996 22:45:47 -0600 Message-ID: <01bb689a.806e86c0$ec1865ce@SNeedha.3lefties.com> I want to thank everybody who replied to my query about building a mobile antenna for 6 & 2. Unfortunately, my 5/8 wave Hustler has seen better days, so I ordered a commercially-marketed antenna to do this. Tnx es 73 -- Earl Needham, KD5XB, in Clovis, NM Phi Mu Alpha Sinfonia, Pi Chi '76 Have you really jumped ROUND PARACHUTES? (Overheard at the Clovis Parachute Center) From amsoft@epix.net Sat Jul 06 13:44:37 1996 From: d-hemphill@ti.com (D.W.Hemphill KC5NG) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can someone I.D. these Amidon cores' frequency range? Date: 3 Jul 1996 12:42:47 GMT Message-ID: <4rdps7$pe@mksrv1.dseg.ti.com> References: <4qulvr$pkn@mksrv1.dseg.ti.com> Thanks, Mike! I will print this info and store it with the cores! Vy 73 es tu agn de KC5NG ar From amsoft@epix.net Sat Jul 06 13:44:38 1996 From: d-hemphill@ti.com (D.W.Hemphill KC5NG) Newsgroups: rec.radio.amateur.homebrew Subject: Re: crystal source Date: 3 Jul 1996 12:43:44 GMT Message-ID: <4rdpu0$pe@mksrv1.dseg.ti.com> References: <4rb4u7$ufp@intelsat2.intelsat.int> In article <4rb4u7$ufp@intelsat2.intelsat.int>, matthew.halsey@intelsat.int says... >Does anyone know of a good source of economically priced crystalsa? >I have an old PMR radio which I want to crystal up for a local repeater >here in Gaithersburg, MD. Try JAN Crystals... 1-800-JAN-XTAL... free catalog, good prices/service. 73 de KC5NG From amsoft@epix.net Sat Jul 06 13:44:39 1996 From: paulc@esslink.com (Paul A. Cianciolo) Newsgroups: rec.radio.amateur.homebrew Subject: FS : Cablewave Hardline Connectors Date: Thu, 04 Jul 1996 01:30:38 GMT Message-ID: <4rghg8$8t1@news.esslink.com> Hello All, I have the following list of hardline connectors for sale All connectors are used but in good condition. (1) of HCC-78-50NM for 7/8" air (2) of HCC-78-50NF for 7/8" air (2) of FLC-78- 50NF for7/8" foam (3) of FLC-12-50NM for 1/2" foam All 7/8" connectors are $20.00 and the 1/2" are $10.00 PaulC@esslink.com From amsoft@epix.net Sat Jul 06 13:44:40 1996 Newsgroups: rec.radio.amateur.homebrew Message-ID: <456@wilkes.ak.planet.co.nz> Reply-To: tony@wilkes.ak.planet.co.nz (Tony Wilkes) From: tony@wilkes.ak.planet.co.nz (Tony Wilkes) Date: Thu, 04 Jul 1996 02:54:11 GMT Subject: Cw on 2M FM rig I have an Kenwood TW4000 2m AND 70cm FM rig with no cw key socket The query could apply to many FM rigs however. Is there any risk of damage to the rig if I key the push-to-talk pins on the mic input socket ?????? and would the output be OK in waveshape as a clean CW signal ???? If you have done this please let me know your results Thanks 73 Tony --------------------------------------------------------------------- Tony Wilkes --- Whangaparaoa, North Island, New Zealand Interests - Ham Radio ZL3SLH- Royal Forest & Bird - Croquet From amsoft@epix.net Sat Jul 06 13:44:41 1996 From: kd1hz@anomaly.ideamation.com (Michael P. Deignan) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: Need INFO, EVERYONE PLEASE READ!! Date: 4 Jul 1996 09:28:42 -0400 Message-ID: <4rggua$ah3@anomaly.ideamation.com> References: <61e7cc$173112.3a2@MYCROFT> <1996Jul1.160514.17867@ke4zv.atl.ga.us> <31db143a.4297332@news.netins.net> In article <31db143a.4297332@news.netins.net>, tkc wrote: >">I have 12 guage wire i can use, but need a little info, what length >">should i cut it at, to use it at 145.470 (local Repeater) I dont >">have any kind of swr meter or anything but my radio which will let me >">know when its pumping out full power... > > Just a second... >When we took the Ham test didn't we have to show that we could figure >frequency to wave length? No, you merely showed that you knew how to memorize all the questions and answers provided to you in advance. MD -- -- -- Who needs looks when you've got taste? -- -- If you don't like my opinions, that's just too damn bad. From amsoft@epix.net Sat Jul 06 13:44:42 1996 From: Bill Meara Newsgroups: rec.radio.amateur.homebrew Subject: Why difficult to generate high power at UHF? Date: 4 Jul 1996 10:35:12 GMT Message-ID: <4rg6p0$hbd@server2.codetel.net.do> Here's a question that has been bothering me for a long time: Why is it that it becomes more difficult to generate RF power as we increase frequency? Why do HF transceivers often have more power out on 80 meters than they do on 10? Why is it so difficult to get lots of power out in the VHF and UHF ranges? TIA 73 Bill N2CQR/HI8 From amsoft@epix.net Sat Jul 06 13:44:43 1996 From: timc@eagle.freespace.net (Tim Carter) Newsgroups: rec.radio.amateur.homebrew Subject: HAM INFO Date: 4 Jul 1996 12:35:34 GMT Message-ID: <4rgdqm$q6f@eagle.freespace.net> I was wondering if there are any sources on the net that cater to the Amateur radio hobbyist in Canada. I'm trying to find information on getting my license so I can join in on all the fun, but I keep finding all these pages that cater to the american ham. If you can help me, please do ! Thanks Tim Carter timc@freespace.net From amsoft@epix.net Sat Jul 06 13:44:44 1996 From: Dan Ellefson Newsgroups: rec.radio.amateur.homebrew Subject: FS: HP 1740A 100Mhz Oscilloscope Date: Thu, 04 Jul 1996 14:28:54 -0600 Message-ID: <31DC2986.489@cc.usu.edu> Reply-To: sl3jj@cc.usu.edu FOR SALE: HEWLETT PACKARD 1740A ANALOG 100Mhz OSCILLOSCOPE The unit is a two channel 100 Mhz oscilloscope with two external trigg ers. It comes with two HP X10 probes that came with the scope and two B&K X10/X1 pr obes that I bought brand new. All the probes are rated at 100 Mhz. The scope is c apable of deflection factors from 1 mV/div to 20 V/div on the vertical scale and 5 ns /div to 20 s/div on the horizontal scale. The scope also has a delayed sweep feature which is set by a precision control knob which allows delay settings of 50 ns to 20 s. Other features of the 1740A include simultanous display of both input channels and t he trigger, bandwidth limit control for attenuation of signals above 20 Mhz, plotting chan nel A vs B, choice of 50 Ohm or 1 Megohm input impedance, Chop mode, Alt mode, A+B display , channel B inversion (this allows A-B display), trigger selction of channel A, B, or ex ternal, trigger level control,LF and HF reject on external trigger inputs, AC, DC, Int ernal and External triggering, External /10 triggering, and many more features. Documentation for the scope is included and consists of the 1740A Oper ator's Guide and the 1740A Operating and Service Manual with includes detailed schematics o f the scope's internal circuitry. The scope comes with a soft leather pouch with a velcro closure that i s attached to the top of the unit allowing storage of manuals and probes. A hard plastic cover is also included that fits snugly over the front face of the scope to protect the controls and CRT. The scope is in very good condition with no noticable dents or scratch es. I've had the scope for quite some time and have been very pleased with its performance and the great many features that come with it. The reason that I am parting with it is beca use I recently purchased a brand new $4500 scope (ouch....) and have no need for two scopes. PRICE: $495 (buyer pays for shipping) Contact Dan at (801) 787-4374 or EMail me at sl3jj@cc.usu.edu From amsoft@epix.net Sat Jul 06 13:44:45 1996 From: AC6V Newsgroups: rec.radio.amateur.homebrew Subject: Re: HAM INFO Date: Thu, 04 Jul 1996 14:51:59 -0700 Message-ID: <31DC3CFF.3F08@ix.netcom.com> References: <4rgdqm$q6f@eagle.freespace.net> Tim Carter wrote: > > I was wondering if there are any sources on the net that cater to the > Amateur radio hobbyist in Canada. I'm trying to find information on > getting my license so I can join in on all the fun, but I keep finding > all these pages that cater to the american ham. > > If you can help me, please do ! > > Thanks > Tim Carter > timc@freespace.net Hi Tim, lots of Canadian Ham Pages listed on Ron Klimas' page at: http://uhavax.hartford.edu/~newsvhf/ham-www.html Also VE7TCP excellent page at: http://ve7tcp.ampr.org/ Good surfing 73 Rod -- Hark for I have hurled my words to the far reaches of the earth! What King of old could do thus?? ..... AC6V From amsoft@epix.net Sat Jul 06 13:44:46 1996 From: Cecil Moore Newsgroups: sci.electronics.basics,sci.electronics.components,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: How do directional RF wattmeters work ? Date: 4 Jul 1996 15:14:03 GMT Message-ID: <4rgn3r$jq0@itnews.sc.intel.com> References: <4rekb7$4e8@news-rocq.inria.fr> <31DAF9F9.1FCB@uiuc.edu> "C. J. Hawley" wrote: >I know this will take a little soaking in but it is all you need to reveal >the magic. Something else that might help is a vector diagram. Let's say we have a voltag e vector proportional to the transmission voltage and another voltage vector proportional to the transmission line current. When there are no reflections, these two vectors are adjusted (calibrated) to be equal in magnitude and phase referenced to the Z0 of the line. Then either with reflections (out of phase V and I) or without reflections (in phase V and I) the following holds: V(i) (vector add) V(v) is proportional to the forward power and V(i) (vector sub) V(v) is proportional to the reflected power. / / +I / / / / Phi - Phase Angle -V --------------------+-------------------- +V Let's say we have 10v proportional to the voltage and 10v proportional to the current and are generating 100w. The following would be true. For Z0=50 ohms, V(v)=10v is proportional to 71 volts on the line V(i)=10v is proportional to 1.4 amps on the line For Z0=75 ohms, V(v)=10v is proportional to 87 volts on the line V(i)=10v is proportional to 1.15 amps on the line For Z0=300 ohms, V(v)=10v is proportional to 173 volts on the line V(i)=10v is proportional to 0.58 amps on the line For Z0=450 ohms, V(v)=10v is proportional to 212 volts on the line V(i)=10v is proportional to 0.47 amps on the line That's why an SWR meter calibrated for 50 ohms needs to be recalibrated to work with 75 ohm line. 73, Cecil, W6RCA, OOTC (not speaking for my employer) From amsoft@epix.net Sat Jul 06 13:44:47 1996 From: Cecil Moore Newsgroups: rec.radio.amateur.homebrew Subject: Re: Question: Reusing Cell Phone on Ham Band Date: 4 Jul 1996 15:22:22 GMT Message-ID: <4rgnje$jq0@itnews.sc.intel.com> References: <1996Jul3.224345.4638@atl.com> Larry Grove wrote: >Is it possible to re-use the cell phone's transceiver on a ham band? Hi Larry, it would be a major project. You would have to change components and readjust the PLL to lock on the 902 MHz band. But the major task would be to replace the internal ROM microcontroller with an identical microcontroller with a different program which, even for me, would be a major development project. You would need complete documentation on the device, something that is hard to come by. It would be much easier to design a 902 MHz HT from scratch, at least for me. 73, Cecil, W6RCA, OOTC (not speaking for my employer) From amsoft@epix.net Sat Jul 06 13:44:48 1996 From: "Michael W. Smith II" Newsgroups: rec.radio.amateur.homebrew Subject: WTBuild!: 6 meter Linear Date: Thu, 04 Jul 1996 20:25:04 -0500 Message-ID: <31DC6EF0.56E9@computize.com> I'd like to build a 6 meter linear amplifier. I'm going to run FM and SSB on it, and I'm wondering what is involved in building one. If someone could point me in the right direction, i'd really appreciate it!! 73's Michael N5TGL From amsoft@epix.net Sat Jul 06 13:44:49 1996 From: Zack Lau Newsgroups: rec.radio.amateur.homebrew Subject: Re: Why difficult to generate high power at UHF? Date: Fri, 05 Jul 1996 12:23:46 -0400 Message-ID: <31DD4192.4EAD@arrl.org> References: <4rg6p0$hbd@server2.codetel.net.do> To: Bill Meara Bill Meara N2CQR/HI8 wrote: > > > Why is it that it becomes more difficult to generate RF power as we > increase frequency? Why do HF transceivers often have more power out on > 80 meters than they do on 10? Why is it so difficult to get lots of > power out in the VHF and UHF ranges? Radio gear is made to work on higher frequencies by making it smaller. However, there is no easy way to make the parts more conductive to keep the losses low. Thus, more exotic techniques are used to get the unwanted heat out. Trying to use excessively large parts doesn't work--you end up with power going around in circles just generating heat. Too much heat and the circuit fails. You can switch to different technologies to maintain a large size as you go to higher frequencies. Zack KH6CP/1 From amsoft@epix.net Sat Jul 06 13:44:50 1996 From: mfraser@vanbc.wimsey.com (Mark Fraser) Newsgroups: rec.radio.amateur.homebrew Subject: Mini Ckts MAR-3/6 Source Date: 5 Jul 1996 13:00:58 GMT Message-ID: <4rj3ma$jie@wolfe.wimsey.com> Just want a few items from Mini Circuits Labs - who sells in small quantities? thanks / mark From amsoft@epix.net Sat Jul 06 13:44:51 1996 From: jlkolb@sd.cts.com (John Kolb) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Mini Ckts MAR-3/6 Source Date: 5 Jul 1996 22:46:19 GMT Message-ID: <4rk5vr$jbe@newsfeed.cts.com> References: <4rj3ma$jie@wolfe.wimsey.com> Mark Fraser (mfraser@vanbc.wimsey.com) wrote: : Just want a few items from Mini Circuits Labs - who sells in small : quantities? Mini-Circuits (718)934-4500 mainly pushes their ERA line of Monolithic Amps 0-8 GHz, but you might phone them and see if they still offer a designer kit for the MAR series. The ERA series kit K1-ERA contains 10 each of ERA-1 ,2, & 3 for $49.95. From amsoft@epix.net Thu Jul 11 17:01:32 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!gater3.sematech.org!pulitzer.eng.sematech.org!usenet From: First Last Newsgroups: rec.radio.amateur.homebrew Subject: Re: Amplitude modulate Minicircuits VCOs ? Date: Tue, 09 Jul 1996 07:17:46 -0700 Organization: SEMATECH, Austin Lines: 32 Message-ID: <31E26A0A.49EC@sematech.org> References: <4rsjbh$tk9@n0jcf.com> NNTP-Posting-Host: 131.153.40.233 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win16; I) Chris Elmquist wrote: > > I'm wondering if anyone has played with these VCOs that they > are now advertising with coverage up thru 2 GHz... and > particularly if anyone has amplitude modulated them ?? > > I'd like to AM modulate a 1 KHz tone (so that I can make > a little sig gen for use with my old HP 415E swr meter)... > > I was wondering if I could just inject the 1 KHz into the > +V (supply) pin of the oscillator and be able to see it > on the output across the entire range that the VCO is > tunable ?? > > Am I dreaming ? > > Thanks for any suggestions... > > 73, Chris > > -- > Chris Elmquist, N0JCF > chrise@n0jcf.com > n0jcf@amsat.orgI haven't tried the Minicircuits VCO but I have used many oth er ones and I normally use a Minicircuits voltage controlled attenuator following the VCO or VCO and buffer. I have also used other voltage controlled attenuators with the same results. The Attenuators can provide as much as 40 dBs of modulation range. 73 WA5VTV Michael From amsoft@epix.net Thu Jul 11 17:01:33 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cdsnet.net!news.magicnet.net!nntp.newsfirst.com!nntp.crosslink.net!munnari.OZ.AU!spool.mu.edu!sgigate.sgi.com!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!tank.news.pipex.net!pipex!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!psinntp!psinntp!psinntp!ss3.fw.hac.com!usenet From: pegood@most.fw.hac.com () Subject: Re: BEER & WINE SHIRTS <> LIQUID POUCH! X-Nntp-Posting-Host: jedeve Message-ID: Sender: usenet@most.fw.hac.com Organization: MESC X-Newsreader: WinVN version 0.82 References: <31dc3327.15958202@news.local.net> Date: Mon, 8 Jul 1996 20:45:02 GMT Lines: 2 In article <31dc3327.15958202@news.local.net>, Natural-by-light@pobox.com (Vin ce) says: > From amsoft@epix.net Thu Jul 11 17:01:34 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!uunet!in2.uu.net!EU.net!usenet2.news.uk.psi.net!uknet!usenet1.news.uk.psi.net!uknet!psinntp!psinntp!psinntp!ss3.fw.hac.com!usenet From: pegood@most.fw.hac.com () Subject: Re: BEER & WINE SHIRTS <> LIQUID POUCH! X-Nntp-Posting-Host: jedeve Message-ID: Sender: usenet@most.fw.hac.com Organization: MESC X-Newsreader: WinVN version 0.82 References: <31dc3327.15958202@news.local.net> Date: Tue, 9 Jul 1996 16:12:00 GMT Lines: 2 In article <31dc3327.15958202@news.local.net>, Natural-by-light@pobox.com (Vin ce) says: > From amsoft@epix.net Thu Jul 11 17:01:34 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.ac.net!news.bconnex.net!news2.insinc.net!pegasus.odyssee.net!news From: Madjid VE2GMI Newsgroups: rec.radio.amateur.homebrew Subject: Re: Can someone I.D. these Amidon cores' frequency range? Date: Wed, 10 Jul 1996 11:22:08 -0700 Organization: Odyssee Internet Lines: 3 Message-ID: <31E3F4D0.5416@odyssee.net> References: <4qulvr$pkn@mksrv1.dseg.ti.com> <4rdps7$pe@mksrv1.dseg.ti.com> NNTP-Posting-Host: pool15_13.odyssee.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win16; I) Toroid info on the WEB http://zeus.cedcc.psu.edu/ind/toroid.html From amsoft@epix.net Thu Jul 11 17:01:36 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.campus.mci.net!news.uky.edu!usenet From: Tfugate@pop.uky.edu (Terry Fugate) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Cw on 2M FM rig Date: 9 Jul 1996 18:51:26 GMT Organization: IT Lines: 39 Message-ID: <4ru9ne$k9a@service3.uky.edu> References: <456@wilkes.ak.planet.co.nz> NNTP-Posting-Host: 128.163.120.82 X-Newsreader: WinVN 0.92.6 In article <456@wilkes.ak.planet.co.nz>, tony@wilkes.ak.planet.co.nz (Tony Wil kes) says: > >I have an Kenwood TW4000 2m AND 70cm FM rig with no cw key socket >The query could apply to many FM rigs however. > >Is there any risk of damage to the rig if I key the push-to-talk >pins on the mic input socket ?????? and would the output be OK in >waveshape as a clean CW signal ???? > >If you have done this please let me know your results > >Thanks >73 Tony > > > > >--------------------------------------------------------------------- >Tony Wilkes --- Whangaparaoa, North Island, New Zealand >Interests - Ham Radio ZL3SLH- Royal Forest & Bird - Croquet While CW is not my favorite mode, I have used an Icom IC-2AT with an old "key" to send CW and with a oscillator to sen MCW. Never had any problem and still use the HT. I also have doen the same thing one on my IC-28A and it worked fine also. Most modern, no TR relay, radios should not be damaged by this. (Just a guess on my part). Of course it is odd to have CW inverted by the HT going quite with the CW signal, and the "hiss" with no signal there.... MCW is better because you can "close" the squelch. Have fun ............................................................................. Terry Fugate UKTV University of Kentucky "The opinions expressed herein are mine, and soley mine. They do not represent the official view of the University of Kentucky, the State of Kentucky, or any agency of any government. If you do not like my opinion, just get on with your life. I will not change your mind and you damn sure can not change mine." From amsoft@epix.net Thu Jul 11 17:01:37 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!news.sprintlink.net!news-pen-14.sprintlink.net!newsfeed.internetmci.com!news.inc.net!newspump.sol.net!daily-planet.execpc.com!net.digalogsys.com!rick From: Rick Miller Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: DON'T FRY THE KIDS! (Was: RF & materials) Date: Thu, 11 Jul 1996 08:23:44 -0500 Organization: Exec-PC BBS - Milwaukee, WI Lines: 39 Message-ID: References: Reply-To: rdmiller@execpc.com NNTP-Posting-Host: vega.execpc.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE In-Reply-To: Xref: news2.epix.net rec.radio.amateur.homebrew:16127 rec.radio.amateur.digital.misc:16479 On Sun, 7 Jul 1996, Michael Spenuk - VA3SP wrote: > Wonder if any of you have conducted experiments, or > have come across papers on the interaction of EM waves > at and near 1.2, 2.4, or 5.7 GHz, with materials? >=20 > I am particularly interested in the following materials: > plywood, wafer board and particle board of various > thicknesses, and; asphalt shingles. I am interested > in these materials with varying moisture content, > and if anyone has studied particular adhesives used > in these products. >=20 > I am interested in the effects of these materials when > located within the radiating near field of an array. Hi Mike! It looks as though you're wanting to come up with some sort of microwave communications for house-to-house use which doesn't come with unsightly dishes on masts. Maybe if you come out and describe what you're really trying to do, you might get some more specifically useful help. In general though, you're going to have no fun at all trying to pump microwave signals through a sloped roof. Think about it for a bit... Where does the part of the signal that doesn't make it through the roof go? It gets reflected *DOWN*. This can generally be regarded as A Bad Thing=AE, especially in the case of residential structures. Rick Miller -------------------------------------------------------------------------- Raportisto demandis de Mahatma Gandhi, "Sr-o. Gandhi, kio vi pensas pri Okcidenta Civilizacio?" Li respondis, "Mi pensas ke gxi estus bona ideo." From amsoft@epix.net Thu Jul 11 17:01:38 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.inc.net!newspump.sol.net!newsfeeder.sdsu.edu!news.iag.net!news.math.psu.edu!news.cse.psu.edu!uwm.edu!math.ohio-state.edu!cs.utexas.edu!swrinde!newsfeed.internetmci.com!cpk-news-hub1.bbnplanet.com!thorn.cc.usm.edu!news From: crsmith@ocean.st.usm.edu (C Russ Smith) Newsgroups: rec.radio.amateur.homebrew Subject: Help w/ DCR Date: Wed, 10 Jul 1996 17:47:06 GMT Organization: Dis Lines: 10 Message-ID: <4s0qbp$77e@thorn.cc.usm.edu> NNTP-Posting-Host: blackray.st.usm.edu X-Newsreader: Forte Free Agent 1.0.82 I know this prolly goes to another group, but this one is close... I have a Jerrold DCR (digital cable radio) and I need to know if there is a way to 'enable' it with some kind of hack... /Space Is The Place\ |---CRussSmith-----|-==> http://sushi.st.usm.edu/~crsmith \~~revolving kitty~/ From amsoft@epix.net Thu Jul 11 17:01:39 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.telalink.net!news.wildstar.net!news.ecn.uoknor.edu!solace!nntp.uio.no!nntp-oslo.UNINETT.no!nntp-trd.UNINETT.no!Norway.EU.net!EU.net!newsfeed.internetmci.com!in2.uu.net!services.arn.net!usenet From: ka0yos@arn.net (ka0yos) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: Homebrew FSK modem Date: 7 Jul 1996 02:42:10 GMT Organization: ARNet, Inc. Lines: 24 Message-ID: <4rn862$3a4@services.arn.net> References: <31D8D2A8.D6B@qtm.net> NNTP-Posting-Host: dialup5-086.arn.net Mime-Version: 1.0 X-Newsreader: WinVN 0.99.4 Xref: news2.epix.net rec.radio.amateur.homebrew:16110 rec.radio.amateur.digital.misc:16458 In article , ken.thompson@Symbios.COM says... > >In article <31D8D2A8.D6B@qtm.net> Kevin Pounders writes: >>From: Kevin Pounders >>Subject: Homebrew FSK modem >>Date: Tue, 02 Jul 1996 00:41:28 -0700 > >>I am trying to build an FSK modem for use on 2M packet, but the plans I >>have calls for a TI TCM3105 FSK modem chip. > >>I have contacted all of the component suppliers that I know but am unable >>to locate this chip (is now obsoulite). > > >It is not obsolete. But I think TI is only making them in surface mount >packages now. Try http://www.jdr.com From amsoft@epix.net Thu Jul 11 17:01:39 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp.coast.net!fu-berlin.de!informatik.tu-muenchen.de!Germany.EU.net!news.dfn.de!news.kfa-juelich.de!djukfa11!iff161 Organization: Forschungszentrum Juelich Date: Thu, 11 Jul 1996 09:49:14 +02 From: Bob Mueller Message-ID: <96193.094914IFF161@DJUKFA11.BITNET> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Homebrew Meter Lines: 15 Because it may not be too well known, I point out that the scales of meter movements are not very linear. The scales of good movements are individually matched or drawn. I know of one important manufacturer that had several versions of scales already printed and selected the one fitting to within the specified accuracy. Hewlett- Packard did (and probably still does) calibrate its precision meters individually with a computer controlled scale drawing machine (it was done photographically in the past but might be handled by LASER printing today, or something of that sort.) Just dividing a new scale into uniformly spaced arcs is likely to lead t o some errors, though I will hazard no guess how big these will be. If I needed accuracy I would make a linear scale, mount it, and feed the meter accurate currents. Then make a corrected scale based on the readoff data. For crude indicators (S-meter, for example), it is not likely to be worth the bother. Bob From amsoft@epix.net Thu Jul 11 17:01:40 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.fibr.net!nntp.primenet.com!news.cais.net!hunter.premier.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e2a.gnn.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: aa8xc@aol.com (AA8XC) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Homebrew Meter Scales Date: 9 Jul 1996 15:20:05 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 7 Sender: root@newsbf02.news.aol.com Message-ID: <4rubd6$pq8@newsbf02.news.aol.com> References: <4rcrtb$evc@mtinsc01-mgt.ops.worldnet.att.net> Reply-To: aa8xc@aol.com (AA8XC) NNTP-Posting-Host: newsbf02.mail.aol.com I have had good luck using Autocad and a laser printer. I'm sure other CAD programs would be as capable. 73's Jim, AA8XC Jim Young, AA8XC Grafton Township, Ohio From amsoft@epix.net Thu Jul 11 17:01:41 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.aimnet.com!news.exodus.net!news1.best.com!nntp.primenet.com!uunet!in1.uu.net!news.ios.com!news2.ios.com!gramercy.ios.com!kodiak From: kodiak@gramercy.ios.com (Tracey Hux) Newsgroups: rec.radio.amateur.homebrew Subject: linears Date: 9 Jul 1996 23:29:50 GMT Organization: Internet Online Services Lines: 1 Message-ID: <4ruq1e$ovg@news2.ios.com> NNTP-Posting-Host: gramercy.ios.com X-Newsreader: TIN [version 1.2 PL2] From amsoft@epix.net Thu Jul 11 17:01:42 1996 Path: news2.epix.net!uunet!in2.uu.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: jasyoung@aol.com (JasYoung) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Looking for Schurr key Date: 9 Jul 1996 11:19:07 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 3 Sender: root@newsbf02.news.aol.com Message-ID: <4rtt9b$km4@newsbf02.news.aol.com> References: <4qpvvn$r62@newsbf02.news.aol.com> Reply-To: jasyoung@aol.com (JasYoung) NNTP-Posting-Host: newsbf02.mail.aol.com I bought mine from Universal Radio near Columbus, OH via mail order. 73 de AA8XC From amsoft@epix.net Thu Jul 11 17:01:43 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cdsnet.net!news.magicnet.net!nntp.newsfirst.com!nntp.crosslink.net!munnari.OZ.AU!harbinger.cc.monash.edu.au!nntp.coast.net!sgigate.sgi.com!news1.best.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!in1.uu.net!DIALix!adelaide.DIALix.oz.au!kibby From: cjag@camtech.net.au (Christine Jaeger) Newsgroups: rec.radio.amateur.homebrew Subject: Radio/Computer Date: Sun, 07 Jul 96 09:22:13 GMT Organization: DIALix Services, Adelaide, Australia. Lines: 19 Message-ID: <4rnfmg$kkh$2@adelaide.DIALix.oz.au> NNTP-Posting-Host: @local012.adelaide.dialix.com.au Hi there, I've got a bc200xlt scanner, and a few other bits of radio gear (still waiting to get my licence :) ) I've got some paket/rtty/morse decoding s/w on the computer but i've got a huge problem getting the audio in... the obvoius compter noise is killing the audio, so here's my question... how can I stop the noise ?? :)) I'm not sure where its getting in, could be the antenna (its right next to the audio out) or most probably coming outta the computer and into the scanner throught the audio cord... is it possible to sheild the wire and and a coupiling capacitor ?? something like that?? am i on the right track ?? If ya have any info, or any web site with diagrams/plans for this sorta thing please mail me :)) Thanks in advance... kibbet cjag@camtech.net.au From amsoft@epix.net Thu Jul 11 17:01:43 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news.onramp.net!usenet From: Bob Winingham Newsgroups: rec.radio.amateur.homebrew Subject: Re: razor blade radio Date: 8 Jul 1996 09:08:49 GMT Organization: OnRamp Technologies; ISP; Dallas/Ft Worth/Houston, TX USA Lines: 4 Message-ID: <4rqj71$27n@news.onramp.net> References: <4rps4s$82r@viper.shadow.net> NNTP-Posting-Host: dal09.onramp.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) To: jeffw@shadow.net X-URL: news:4rps4s$82r@viper.shadow.net might want to add high Z ear/head phone to that list. The rust spots on the razor blade acts as a diode. From amsoft@epix.net Thu Jul 11 17:01:44 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!swrinde!elroy.jpl.nasa.gov!decwrl!news.PBI.net!cbgw3.att.com!nntphub.cb.lucent.com!news From: 73573.1504@compuserve.com (Mike A. Penner) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Recommendations for mircrostripline design software packages? Date: Wed, 10 Jul 1996 18:56:17 GMT Organization: Lucent Technologies, Columbus, Ohio Lines: 26 Message-ID: <4s0k54$f8h@nntpa.cb.lucent.com> References: NNTP-Posting-Host: cbpcmap.cb.lucent.com X-Newsreader: Forte Free Agent 1.0.82 There is a free transmission line software package at http://users.deltanet.com/~pekarek/index.html#AWR that seems to be be quite nice. You do have to fill out a questionarre to get the software, but that is relatively painless. n9xlt@holli.com (David A. Wallace) wrote: >Does anyone have any recommendations for software used in designing >microstripline circuit boards? Urls, catologues, packages, etc... Any >information would be greatly appriciated. > Thanks, > N9XLT (David A. Wallace) > n9xlt@holli.com > Kokomo, In. Opinions Expresses Are Entirely My Own. In Fact It Is Rare That Anybody Agrees With Me. Mike Penner | "Firearms Stand Next In Importance To The Lucent Technologies | Constitution Itself. They Are The American map@cbmsg.att.com | People's Liberty Teeth." George Washington From amsoft@epix.net Thu Jul 11 17:01:46 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Single Band HF Amplifiers Message-ID: <1996Jul10.152108.11609@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4ruavq$pm8@newsbf02.news.aol.com> Date: Wed, 10 Jul 1996 15:21:08 GMT Lines: 31 In article <4ruavq$pm8@newsbf02.news.aol.com> aa8xc@aol.com (AA8XC) writes: >Back in the 60's or 70's the ARRL Handbook had a series of single band >rack mounted HF amplifiers which shared only a common power supply. > >If anyone remembers these and which issue(s) they were in I'd appreciate >being reminded. I had the book at one time but must have gotten rid of it >years ago. Jim, you'll find the project starting on page 194 of the 1962 Handbook. Each single band amp uses a pair of 813s in parallel, with a link coupled grid circuit and a Pi network output circuit. Filament and drive power are switched to the active amplifier, HV, screen voltage, and bias are maintained on all of them all the time from the common power supply. I don't think much of the idea of switching filaments on with HV and bias already present. 813s are tough old birds, but that's still abuse. I'd consider a time delay relay in each RF deck that kept screen voltage off the tubes until their filaments warmed up. The author doesn't mention this (I guess he assumed everyone would realize it), but the meters are hot in this design. They need to be behind a protective insulating barrier. The picture shows the meter panel recessed behind a glass window, and you should take care to duplicate this safety feature. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Thu Jul 11 17:01:47 1996 Path: news2.epix.net!uunet!inXS.uu.net!ott.istar!istar.net!tor.istar!news.inforamp.net!ts22-16.tor.istar.ca!user From: larryr@inforamp.net (Larry Rothman) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.swap Subject: Standard HX240U(AB) Programming info needed Date: 8 Jul 1996 14:47:35 GMT Organization: iSTAR Internet Inc. Lines: 11 Message-ID: NNTP-Posting-Host: ts22-16.tor.istar.ca Xref: news2.epix.net rec.radio.amateur.equipment:30960 rec.radio.amateur.misc:105157 rec.radio.amateur.homebrew:16117 rec.radio.swap:70022 I have just acquired a couple of Standard Radio UHF handhelds Model HX240U(AB) at a local hamfest. They display the letters CL when turned-on. These are commercial HT's. No keypad, just 4 buttons across the top of the front plus light and monitor buttons. Any help with information (programming/manuals/etc) on these units would be greatly appreciated. Thanks, Larry Rothman VE3LRI Toronto, Canada From amsoft@epix.net Thu Jul 11 17:01:48 1996 Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!sgigate.sgi.com!news.msfc.nasa.gov!bcm.tmc.edu!newshost.convex.com!news.onramp.net!usenet From: qvox@onramp.net (Larry Brantingham) Newsgroups: rec.radio.amateur.homebrew Subject: Tools for voice synthesis Date: 10 Jul 1996 16:33:59 GMT Organization: Quadravox, Inc. Lines: 15 Message-ID: <4s0m1n$dis@news.onramp.net> NNTP-Posting-Host: legroom180.onramp.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 A new WWW site (http://rampages.onramp.net/~qvox) describes a low-cost software/hardware development tool for creating voice output subsystems. Windows(tm) based acquisition, analysis and editing software, in combination with a standard 16-bit sound card, codes and formats speech for programmation into Texas Instrumemts TSP50P11 OTP speech synthesizer chips. We've been told that there might be some interest in amateur radio in a custom voice output capability. See what you think! Thanks. Larry Brantingham Quadravox, Inc qvox@onramp.net 1-214-669-4002 From amsoft@epix.net Thu Jul 11 17:01:49 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!uunet!inXS.uu.net!nntp.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!ixnews1.ix.netcom.com!netcom.com!dgf From: dgf@netcom.com (David Feldman) Subject: Re: Tubes: Where To Buy ? Message-ID: Organization: Organization? Me? References: <09960606153631.OUI91.rhiii@pop.erols.com> <31e20a00.0@mothra.westworld.com> Date: Tue, 9 Jul 1996 14:39:09 GMT Lines: 38 Sender: dgf@netcom22.netcom.com In article <31e20a00.0@mothra.westworld.com> Jay123a writes: >rhiii@pop.erols.com (Richard Harrison) wrote: >>Hello: >> >> Have on old Amp Supply LA-1000 amplifier that needs new tubes. >> >> Tube(s, 4 of them) are marked 6MJ6/6LQ6/6JE6C. Can anyone suggest >>a place to purchase new ones at good prices ? >> >Hello Richard: > >These tubes in your amplifier use to plentiful because the TV industry >used them as horizontal sweep tubes in their TV set designs. But not no >more. So the good old days of 7 dollars each has long gone. > >Jay. Hello Jay: This problem comes up from time to time, and I tell people to consider rewiring the amp for a 24V filament voltage (use a 24V 2A transformer) and try a set of 24LQ6's, which are sold by antique electronic supply for $8.50 or so each (not quite $7 but still a pretty good deal). Alternatively, try 31LQ6's, and put the new 24V xfmr in series with the existing 6V filament winding. Either way, this lets you use tubes that are still plentiful and rather cheap. I've been using a set of four ECG/Philips 31LQ6's in a Dentron GLA-1000B for some time now and they work very well - they are the same except for filmemt voltage and were very cheap (4.50 each) when I bought them last year on sale. Just remember to clearly mark the amplifier so someone in the future doesn't plug (valuable/rare) 6LQ6's in and blow the filaments. A strategically placed fuse would be cheap insurance. 73 Dave WB0GAZ dgf@netcom.com From amsoft@epix.net Thu Jul 11 17:01:51 1996 Path: news2.epix.net!uunet!inXS.uu.net!in2.uu.net!hunter.premier.net!netaxs.com!news-out.microserve.net!news-in.microserve.net!news From: dcowey@cyberia.com (gudmundur) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Why difficult to generate high power at UHF? Date: 6 Jul 1996 03:31:18 GMT Organization: silverlake stable Lines: 22 Message-ID: <4rkmm6$dq7@crash.microserve.net> References: <4rg6p0$hbd@server2.codetel.net.do> NNTP-Posting-Host: sl65.cyberia.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.6 In article <4rg6p0$hbd@server2.codetel.net.do>, w.meara@codetel.net.do says... > >Here's a question that has been bothering me for a long time: > >Why is it that it becomes more difficult to generate RF power as we >increase frequency? Why do HF transceivers often have more power out on >80 meters than they do on 10? Why is it so difficult to get lots of >power out in the VHF and UHF ranges? > >TIA 73 Bill N2CQR/HI8 > > One of the main reasons is that even a small capacitance looks like a short circuit at uhf. If we try to use this capacitance as resonant tuning it can help, but only to a small extent. The next reason is electron transit time in the amplifier element (tube-transistor), it becomes difficult to control electron flow so we then resort to something like a klystron. How much power do you want? Even old technology can make megawatts in the gigahertz range! From amsoft@epix.net Thu Jul 11 17:01:52 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Why difficult to generate high power at UHF? Message-ID: <1996Jul10.143547.11317@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4rg6p0$hbd@server2.codetel.net.do> Date: Wed, 10 Jul 1996 14:35:47 GMT Lines: 54 In article <4rg6p0$hbd@server2.codetel.net.do> Bill Meara writes: >Here's a question that has been bothering me for a long time: > >Why is it that it becomes more difficult to generate RF power as we >increase frequency? Why do HF transceivers often have more power out on >80 meters than they do on 10? Why is it so difficult to get lots of >power out in the VHF and UHF ranges? The device input and output capacitances present lower and lower impedances as frequency increases. This effectively shunts signal power, requiring more drive, and delivering less output power to the load. Or looked at alternatively, the time constant for charging and discharging the input capacitance becomes long with respect to a cycle as frequency increases, the capacitance thus doesn't get fully charged on each driving cycle, and less peak to peak gate voltage is available to the active device as a result. This assumes a constant impedance driving source. If you lower the driving source impedance as frequency increases, you can reduce the time constant of the gate circuit in step with increasing frequency and maintain peak to peak drive voltage. There are practical limits to how low a driving source impedance you can use, however, so this only goes so far. A similar thing happens on the output side, with the device having to charge the output capacitance, and the load having to discharge it, in the space of a cycle. The peak to peak output voltage falls, and according to P=E^2/R, power output falls as well unless you lower the load R in step with increasing frequency. Again there are practical limits to how far you can go in that direction. You can "tune out" the device capacitances with series inductance, but this is inherently narrowband, and also can lead to instability if you aren't careful due to phase shifts which may induce the circuit to become an oscillator. The best thing you can do is select devices with low input and output capacitance, but that means gate area becomes very small at higher frequencies and you run into power handling limits. At very high frequencies, transit time of the majority carriers becomes a factor. To minimize that, you want a very short channel, but that also limits power handling (because it lowers the PIV punch through limit). In some cases, you can take advantage of transit time by using "slow wave structures", IE the principle behind the traveling wave tube. You can even do that with solid state devices using a circuit called a distributed amplifier. It gets pretty complex pretty quickly, however. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Mon Jul 15 17:03:57 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsfeed.internetmci.com!swrinde!cs.utexas.edu!math.ohio-state.edu!uwm.edu!news-res.gsl.net!news.gsl.net!ix.netcom.com!news From: jeffa@ix.netcom.com(Jeff Anderson) Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: 15V too much for mobile radio? Date: 13 Jul 1996 11:50:27 GMT Organization: Netcom Lines: 32 Message-ID: <4s82i3$l3t@dfw-ixnews3.ix.netcom.com> References: <4s7cao$deo@piranha.ianet.net> <31e77060.1236466@a3bsrv.nai.net> NNTP-Posting-Host: pax-ca23-19.ix.netcom.com X-NETCOM-Date: Sat Jul 13 6:50:27 AM CDT 1996 Xref: news2.epix.net rec.radio.cb:29714 rec.radio.amateur.misc:105206 rec.radio.amateur.equipment:31018 rec.radio.amateur.homebrew:16141 In <31e77060.1236466@a3bsrv.nai.net> ka1jy@usa.nai.net (Brian Ellsworth) writes: > >On 13 Jul 1996 01:31:04 -0400, adkinsg@piranha.ianet.net (Garry P. Adkins) >wrote: > >>I recently found a 24VDC power supply in my garage that >>came from an old monitor. I think I'm going to use it >>to power a cheap little radio for base station use. (It's >>a mobile radio, btw) >> >>I'm thinking along the lines of using one of the TO-220 case >>voltage regulator (maybe adding some big caps for ripple) >>to bring the 24V down to 12 or 15 volts. > >Hmm, let's see. 24 VDC on the source, 1.5 amps, and 15 vdc out, and a to-220 >case egh? I'd start saving for a nice service manual on that radio if i were >you. When that regulator blows from the 14 watts you attempted to dissipate it >may fail shorted and put 24 volts into your mobile. Either that or plan on some >pretty fancy cooling system for that puppy, it's going to get screaming warm. Include a dropping resistor between the supply and the regulator to minimize the voltage drop (and subsequent power dissipation) across the regulator. - Jeff, WA6AHL From amsoft@epix.net Mon Jul 15 17:03:58 1996 Path: news2.epix.net!uunet!inXS.uu.net!nntp.primenet.com!news.fibr.net!news.sprintlink.net!news-fw-6.sprintlink.net!dns.ianet.net!piranha.ianet.net!not-for-mail From: adkinsg@piranha.ianet.net (Garry P. Adkins) Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: 15V too much for mobile radio? Date: 13 Jul 1996 01:31:04 -0400 Organization: Ichthus Access Networking Inc., (304) 453-5757 Lines: 28 Message-ID: <4s7cao$deo@piranha.ianet.net> NNTP-Posting-Host: piranha.ianet.net Xref: news2.epix.net rec.radio.cb:29722 rec.radio.amateur.misc:105221 rec.radio.amateur.equipment:31035 rec.radio.amateur.homebrew:16143 Hi! I recently found a 24VDC power supply in my garage that came from an old monitor. I think I'm going to use it to power a cheap little radio for base station use. (It's a mobile radio, btw) I'm thinking along the lines of using one of the TO-220 case voltage regulator (maybe adding some big caps for ripple) to bring the 24V down to 12 or 15 volts. My concern is that 12V may not be sufficient for full power transmit since the radio expects 13.8. (The radio only pulls 1.5A at max modulation, so it doesn't need a ton of juice) There is a very common 15v regulator available, would that be too far above the 13.8? I'm not aware of any 13.8v parts. Any help much appriciated! -- ------------------------------------------------------------------------ It is dangerous to be right when the government is wrong. --Voltaire ------------------------------------------------------------------------ Garry Adkins adkinsg@ianet.net USnail: 712 Chestnut St. BELLNet: +1-304-453-5757 Kenova, WV 25530-1511 From amsoft@epix.net Mon Jul 15 17:03:59 1996 Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!uwm.edu!lll-winken.llnl.gov!nntp.coast.net!dispatch.news.demon.net!demon!ifwtech.demon.co.uk!G3SEK From: "Ian White, G3SEK" Newsgroups: rec.radio.amateur.homebrew Subject: Re: AM Modulating Tube Finals With Solid State Audio Amps Date: Sat, 13 Jul 1996 15:24:46 +0100 Organization: IFW Technical Services Lines: 41 Distribution: world Message-ID: References: <4s6rit$qlc@globe.indirect.com> NNTP-Posting-Host: ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.12 <9qI82xurdT5+z2vSgnCPFcKgQL> Jeff Duntemann wrote: >Here's a notion I had a long time ago and haven't gotten around to >trying... > >AM Modulation transformers are really rough to find these days, but >the thriving tube audio business provides audio output transformers to >match nearly any tube output impedence to an 8-ohm load, at almost any >power level you'd care to try. > >Now...turn that around: Could we generate audio power with one of >these solid state audio amp modules (say 20-50 watts) and pipe the >audio into the 8-ohm side of one of those output transformers, and >then use the other side as the modulating output in series with the >plate of a Class C tube final like a 6146B? > >Every solid-state audio power amp IC or module I've seen works into >either 4 or 8 ohms. I can't see why we couldn't use an output >transformer "backwards" to generate audio power at the impedence a >tube final like a 6146 or 811A would like. > >I LOVE the audio quality of plate-modulated AM, and this would imply >an easy way to make a good quality 50-100W AM transmitter without >having to grub for a used modulation transformer. > >Has anybody tried this? Are there any nonobvious gotchas I haven't >thought of yet? > 'Fraid so. The core of a modulation transformer is designed to carry the DC current to the PA, which an ordinary AF output transformer isn't. I guess it could work, but you'd need to under-run the transformer very considerably from its normal audio rating, to avoid core saturation. Using an AF transformer with a higher power rating would also help with any possible insulation problems. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - world-wide. From amsoft@epix.net Mon Jul 15 17:04:00 1996 Path: news2.epix.net!uunet!inXS.uu.net!excelsior.flash.net!usenet From: Danny Williams Newsgroups: rec.radio.amateur.homebrew Subject: cell phone conversion Date: Sat, 13 Jul 1996 16:39:16 -0500 Organization: Flashnet Communications Lines: 4 Message-ID: <31E81784.5D27@flash.net> NNTP-Posting-Host: hasc1-65.flash.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01KIT (Win95; U) Has anyone considered on done a conversion of an old cellular phone to a 900 mhz. ham tranceiver? Any thoughts or comments appreciated. Danny KB5WER From amsoft@epix.net Mon Jul 15 17:04:01 1996 Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!goo.npd.usace.army.mil!AesSedai.wes.army.mil!news From: Butch Magee Newsgroups: rec.radio.amateur.homebrew Subject: FT-2200 Mod Date: Thu, 11 Jul 1996 10:27:34 -0500 Organization: USAE Information Technology Laboratory Lines: 4 Message-ID: <31E51D66.2265@apollo.wes.army.mil> NNTP-Posting-Host: 134.164.80.37 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win95; I) Does anyone have, or know where to get, the mod/mods for the Yaesu FT-2200? Butch KF5DE From amsoft@epix.net Mon Jul 15 17:04:02 1996 Path: news2.epix.net!uunet!inXS.uu.net!nntp.primenet.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail From: stevem@best.com (Stephen Muther) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Gerber file viewer ? Date: 11 Jul 1996 09:34:08 -0700 Organization: BEST Internet Communications Lines: 35 Message-ID: <4s3ae0$riu@shellx.best.com> References: NNTP-Posting-Host: shellx.best.com In article , wrote: >Can anyone knowledgeable in pc board CAD drawing point me to >a decent shareware Gerber file viewer ? >The one I have now is quite crude...it shows all lines as the same >regardless of their thickness. The program is okay for checking >general connectivity and placement but not so great with detail. >I'd like to see if there is something better out there. >I would consider commercial software too if the price is reasonable. > >(The schematic/pc board package I use shows multi-layers in x-ray >perspective rather than mirrored images as you would see it by flipping >the board. A gerber viewer really helps to see what the board will >really look like from the plots.) > >Many thanks ! > >Hugh Duff VA3TO Toronto > > > >--- > þ NFX v1.3 [000] > The CAD package I use, Protel, has a built in Gerber viewer. I know there are some shareware viewers out there. You might try the Simtel archive (ftp: oak.oakland.edu) or posting your question to sci.electronics.cad. You might find some good answers there. Good Luck Steve Muther WF6R From amsoft@epix.net Mon Jul 15 17:04:03 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cableol.net!news.uoregon.edu!hunter.premier.net!news-res.gsl.net!news.gsl.net!sgigate.sgi.com!olivea!charnel.ecst.csuchico.edu!csusac!zimmer.CSUFresno.EDU!usenetbbs.ucs.csufresno.edu!user From: Jim_Moore@usenetbbs.ucs.csufresno.edu (Jim Moore) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Glue for base of tubes.. Date: Thu, 11 Jul 96 03:24:04 -0800 Organization: Calif State University, Fresno Lines: 14 Message-ID: <7945364.ensmtp@usenetbbs.ucs.csufresno.edu> NNTP-Posting-Host: usenetbbs.ucs.csufresno.edu X-Newsreader: ExpressNet/SMTP v1.1.5 You will have trouble with epoxy in the tube environment. Just look at any of those old television sets that tried to put tube sockets directly on pc boards. The major problem is heat. Tubes, a.k.a. themionic emitting devices, operate at substantially elevated temperatures. I think that you will find that epoxy is not much good over 200 degrees. I am sorry that I can't make any recommendations for bonding products that have high temperature and high dialectric properties. Maybe a tube manufacturer might have a suggestions. Good luck. Jim From amsoft@epix.net Mon Jul 15 17:04:04 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!mint.net!usenet From: zmbwf@somtel.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Good CB to Convert to 10m FM? Date: Sun, 14 Jul 96 13:45:56 GMT Organization: Maine InternetWorks Lines: 24 Message-ID: References: <4pmmpt$9g@usenet1.sjc.in.sel.sony.com> <31CD79E0.4A92@cyberway.net> NNTP-Posting-Host: dialup-h-3.mint.net X-Newsreader: Quarterdeck Message Center [2.00] On 6/23/96 1:07PM, in message <31CD79E0.4A92@cyberway.net>, traveler@cyberway.net wrote: > Mark Schoonover - KA6WKE wrote: > > > I'm looking for a CB that would be relatively easy to convert to > > 10m FM. I have the usual equipment, etc. This would be my first > > attempt and I don't know much about the different CB gear available. > > I have used all three on 10 FM, converted CB's convert commercial rigs, and > radios > designed for 10FM. Converted CB's are the worse & a waste of a good radio. > > Go get a old Mortac or Mastr Pro & use that. CB's have poor IF sections & > low > power. Leave the CB on it's intended freqs where it canbe of good use. Don`t listen to those guys. Obviously, they have never tried it. Get yourself a good Cobra 148 or Uniden Grant XL. These are easy to modify for 10M, just change the xtal and re-tune the vco, mixer and RF coils. The Cobra 148 and Grant have Excellent double - conversion recievers. Like I said, don`t listen to the know-nothings. Louie N1CSS From amsoft@epix.net Mon Jul 15 17:04:05 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.fibr.net!nntp.primenet.com!news.cais.net!hunter.premier.net!newsfeed.internetmci.com!mr.net!news.mr.net!inet-serv.com!n0jcf.com!not-for-mail From: chrise@n0jcf.com (Chris Elmquist) Newsgroups: rec.radio.amateur.homebrew Subject: helical before or after GaAsFET in preamp ? Date: 11 Jul 1996 15:15:31 -0500 Organization: The Basement of N0JCF Lines: 20 Message-ID: <4s3nd3$7a3@n0jcf.com> NNTP-Posting-Host: n0jcf.com I am interested in playing with some of these TOKO helical filters for 2m, 222 and 432 in conjuction with some GaAsFET preamps. I have a commercially built preamp (AMPIRE) that has the helical filter AFTER the GaAsFET... this seems cool since it probably doesn't contribute much to the noise figure this way... but I'm wondering what other tradeoffs there are to this method as opposed to putting the helical ahead of the GaAsFET. Putting it ahead would obviously add to the noise figure and put about 6dB of loss before the GaAsFET as well... Where do guys like SSB Electronics put the helicals in their helically filtered preamps ? Any comments greatly appreciated. 73, Chris -- Chris Elmquist, N0JCF chrise@n0jcf.com n0jcf@amsat.org From amsoft@epix.net Mon Jul 15 17:04:08 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e2a.gnn.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Homebrew Meter Date: 12 Jul 1996 05:11:53 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 69 Sender: root@newsbf02.news.aol.com Message-ID: <4s54sp$kck@newsbf02.news.aol.com> References: <96193.094914IFF161@DJUKFA11.BITNET> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader Hi Bob, I used to be Engineering Manager at a company that made meters (among other things). In article <96193.094914IFF161@DJUKFA11.BITNET>, Bob Mueller writes: > >Because it may not be too well known, I point out that the scales of meter >movements are not very linear. I wonder waht type of accuracy your are reffering to? We manufactured meters that were within 1% at full scale and half when calibrated at 3/4 scale. At 3/4 scale they were dead on at room temperature. Let's assume we have a conventional 1% FS meter reading 1000 uA (one mA). The net error at any point of the scale would be less than 10 uA. If pickets were placed every degree on a 100 degree movement, the maximum error would be one picket anywhere on the face of the meter. If the scale arc was three inches long, the pickets would be around .03 inches apart. If the pointer of the meter was .05 inches from the scale, parallax would be a bigger problem than metering error. >The scales of good movements are individually >matched or drawn. I know of one important manufacturer that had several >versions of scales already printed and selected the one fitting to within >the >specified accuracy. Hewlett- Packard did (and probably still does) >calibrate its precision meters individually with a computer controlled scale >drawing machine (it was done photographically in the past but might be >handled >by LASER printing today, or something of that sort.) We only did that if the scale was a large mirrored scale. Without a very large mirrored scale, errors caused by the person's method of reading the scale dominated the error. Perhaps HP was compensating for circuit variations (such as non-linearity in a RF detector) rater than actual meter variations? If it was actual meter variations, the meter manufacturer would be the one changing the scale, not H-P. We did that in 7 inch mirrored scale 1/2 percent meters. > Just dividing a new scale into uniformly spaced arcs is likely to lead >to >some errors, though I will hazard no guess how big these will be. If I >needed >accuracy I would make a linear scale, mount it, and feed the meter accurate >currents. That's very true. The characteristics of the movement vary with the construction of the "magnetic window" surrounding the motor coil. While good quality movements track very closely from meter to meter in production, you shouldn't do a scale on a movement you've never plotted before by measuring FS and dividing the scale into equal divisions. 1% of FS is easy to do in production without custom selecting each scale, and 1/2 percent is possible. Scales less than 1/2 percent require either custom plotting or tight control of components that control the flux density in the area of the motor. A 1/2 percent meter requires many hundreds of pickets and a large mirrored scale to be useful, the error would be a maximum of 5 microamperes on a 1000 uA (1 mA) meter WITHOUT using a custom scale for each movement. 73 Tom From amsoft@epix.net Mon Jul 15 17:04:09 1996 Path: news2.epix.net!uunet!in2.uu.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!nntp.coast.net!howland.reston.ans.net!news-e2a.gnn.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: Homebrew Meter Date: 11 Jul 1996 17:03:59 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 41 Sender: root@newsbf02.news.aol.com Message-ID: <4s3q7v$3m5@newsbf02.news.aol.com> References: <4s3km2$a0i@peabody.colorado.edu> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4s3km2$a0i@peabody.colorado.edu>, tiemann@spot.Colorado.EDU (TIEMANN BRUCE) writes: > >They also usually, irritatingly, depend on the angle of the face with >respect to gravity. Unless the thing is perfectly balanced, which even >fairly nice, commercial meters aren't, gravity pulls "down" on the needle, >which results in low readings when the needle is less than half scale, and >high readings when the needle is past half scale, and having a smoothly >varying sine-like dependence of error on needle angle. Test the meter this way.... Lay the pointer flat and zero it with the regulator (zero adjust). Hold the meter so the pointer is vertical. Hold the meter so the pointer is horizontal. It the pointer remained on zero the movement is properly balanced. If the meter isn't balanced, it was a crummy job or a cheap meter. Precision meters are ALWAYS balanced (unless someone isn't doing their job) and free from gravity induced errors. They are balanced by sliding little coiled weights in and out (they are at 90, 180, and 270 degrees in reference to the pointer), and using temperature reflowable glue to retain them in place. Fine tuning is done by tweeking the angle of the weights just slightly or adding a tiny dot of glue. This error also is reduced by increasing meter torque. Assuming all the resistance is in the moving coil, a 1 mA 1000 ohm meter is much less sensitive to balance than a 50 uA 50 ohm meter. With high torque meters, balancing is much less critical. More important than any of this are effects of a steel panel. Be sure the meter is used in the type of environment it was specified to be used in. 73 Tom From amsoft@epix.net Mon Jul 15 17:04:09 1996 Path: news2.epix.net!uunet!in2.uu.net!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: peterw@dyson.BRisnet.ORG.AU (Peter L. Williamson) Newsgroups: rec.radio.amateur.homebrew Subject: Schematic for pro-2023 scanner Date: 13 Jul 96 12:17:08 GMT Organization: ucsd usenet gateway Lines: 7 Message-ID: <199607131219.WAA24752@dyson.brisnet.org.au> NNTP-Posting-Host: mail.ucsd.edu Originator: daemon@ucsd.edu Hello, I am looking for some service information on the Tandy (Radio Shack) scanner model pro-2023. A schematic and /or pcb layout would be most appreciated. Peter L. Williamson VK4AWP. peterw@dyson.brisnet.org.au From amsoft@epix.net Mon Jul 15 17:04:10 1996 Path: news2.epix.net!uunet!inXS.uu.net!excelsior.flash.net!usenet From: Tom Lewis Newsgroups: rec.radio.amateur.homebrew Subject: Where is Borg Electronics? Date: 13 Jul 1996 21:49:04 GMT Organization: AB5CK Lines: 7 Message-ID: <4s95kg$l7o@excelsior.flash.net> NNTP-Posting-Host: p2-53.flash.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22KIT (Windows; U; 16bit) Does anyone know how I can get in touch with "Borg Instruments"? Any help would be appreciated. (((73!))) Tom Lewis - AB5CK From amsoft@epix.net Sun Jul 21 18:53:18 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp.primenet.com!news1.best.com!sgigate.sgi.com!newsfeeder.sdsu.edu!news.erinet.com!bug.rahul.net!rahul.net!a2i!kaiwan.kaiwan.com!not-for-mail From: alf@kaiwan.com (Alfred Lee) Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: 15V too much for mobile radio? Date: 15 Jul 1996 20:51:36 -0700 Organization: KAIWAN Internet (310-527-4279,818-756-0180,909-785-9712,714-638-4133,805-294-9338) Lines: 39 Sender: alf@kaiwan009.kaiwan.com Message-ID: References: <4s7cao$deo@piranha.ianet.net> <31e96f8e.0@mothra.westworld.com> <4sck1l$t5p@piranha.ianet.net> NNTP-Posting-Host: kaiwan009.kaiwan.com Xref: news2.epix.net rec.radio.cb:29732 rec.radio.amateur.misc:105244 rec.radio.amateur.equipment:31053 rec.radio.amateur.homebrew:16149 In article <4sck1l$t5p@piranha.ianet.net>, adkinsg@piranha.ianet.net (Garry P. Adkins) wrote: > >Yes I would vote that 15 volts is a bit high for your radio. > > Hi! > > I ran some tests this afternoon with my DMM. I connected the DMM > to a lighter plug and then drove around and watched the voltage. > > Here's what I saw: > > Started out at 12.8v before starting the car > > Started the car, and it jumped to 14.8 for several seconds then > settled down to 14.6 for about 2 minutes. > > As I drove over the next 10 minutes, it slowly creeped down > to 14.2 where it stayed. (at least until I quit watching > the meter and started watching the road!) > > FWIW, the car is a 92 Explorer. > > Garry > > Years ago (> 10+ years?) I read that it is quite possible to get transient spikes up to 80-90 V. Modern vehicular electrical system might do better. However, if you know that in some aspects the specifications for vehicular electronics system is more stringent that Mil Spec, you might get worried. Any one with some facts to fill in? 73, --- Alfred Lee alf@kaiwan.co m KE6KGV 'The answer is (e^iã + 1) ? "No" : "Yes"' Remembering: KE6LTH, KD6HNU, March 22, 1996 From amsoft@epix.net Sun Jul 21 18:53:19 1996 Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: 15V too much for mobile radio? Message-ID: <1996Jul16.125042.3848@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4s7cao$deo@piranha.ianet.net> <31e96f8e.0@mothra.westworld.com> <4sck1l$t5p@piranha.ianet.net> Date: Tue, 16 Jul 1996 12:50:42 GMT Lines: 46 Xref: news2.epix.net rec.radio.cb:29753 rec.radio.amateur.misc:105275 rec.radio.amateur.equipment:31081 rec.radio.amateur.homebrew:16163 In article alf@kaiwan.com (Alfred Lee) writes: > >Years ago (> 10+ years?) I read that it is quite possible to get >transient spikes up to 80-90 V. Modern vehicular electrical >system might do better. However, if you know that in some aspects >the specifications for vehicular electronics system is more >stringent that Mil Spec, you might get worried. Any one with some >facts to fill in? The vehicle power buss is very dirty. During starting, transients of 300 volts are not uncommon. Any time an inductive load switches on or off (a fan motor for example), there will be a nasty spike. Any electronics used in a vehicle needs suppressors to protect it from these spikes and surges. That's normally built into equipment designed to operate in the auto environment. But if you build something yourself to put in the car, make sure you use adequate suppression and filtering. It is also normal for the vehicle electrical buss to vary from as low as 10.5 volts to as high as 14.8 volts during normal operation. So use of regulation is highly recomended for equipment which won't tolerate fairly wide voltage swings. Once the alternator has recharged the battery from the starting drain, the voltage will normally stay in the range of 13.8-14.2 volts on the vehicle buss. But during peak charging, voltage will rise to 14.8 volts, and if you run equipment with the engine off, the battery can go down to 10.5 volts as it nears the point where it is so discharged that it won't start the car. (You should never let a car battery discharge below 10.5 volts or you'll shorten its life.) A number of ham rigs get *real* squirrelly when the voltage drops below 11 volts. You can get that at the rear terminals of the radio even with the battery at full charge if you have significant resistance in the wiring to the radio. 1.3 ohms will drop 1 volt for each ampere of draw. With a radio requiring 10 amps, you could wind up with nearly zero volts at the back of the equipment if the resistance of the total wiring between the battery and the radio were only an ohm. You want wiring that has a total resistance in the 1/100ths of an ohm range. Use heavy cables and good connectors. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Sun Jul 21 18:53:22 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!warwick!lyra.csx.cam.ac.uk!ard12 From: ard12@eng.cam.ac.uk (A.R. Duell) Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: 15V too much for mobile radio? Date: 16 Jul 1996 14:43:58 GMT Organization: University of Cambridge, England Lines: 35 Message-ID: <4sg9re$703@lyra.csx.cam.ac.uk> References: <4s7cao$deo@piranha.ianet.net> <1996Jul13.080226.26905@ke4zv.atl.ga.us> <4se7qs$kbf@lyra.csx.cam.ac.uk> <31EB4650.2519@rcru.rl.ac.uk> NNTP-Posting-Host: tw600.eng.cam.ac.uk Xref: news2.epix.net rec.radio.cb:29754 rec.radio.amateur.misc:105278 rec.radio.amateur.equipment:31083 rec.radio.amateur.homebrew:16164 Mike Willis writes: [...] >> I finally discovered that the switch-on current of the streamer was >> enough to cause the output pin of the regulator to be below 9V for a >> significant time after power-up. Thus, the output was more negative than >> the common pin, which caused the 78S15 to go into shutdown mode. I >> finally cured it by connecting a capacitor of a few 10's of uF across the >> zener to give a 'soft start'. It now works fine... >How about removing the resistor alltogether and using the regulator >bias current to (a few 10s of mA) to provide the drop across the zener. _Some_ of the lower-current regulators don't provide enough bias current to let the zener stabilise. I was caught by that once as well, and now prefer to include a resistor if possible. The extra cost of the resistor and soft-start capacitor is minimal, and it ensures that the design is reliable. >A couple of 0.1uF capacitors between input and common and output and >common on the regulator to avoid instability. Agreed. I did include them (well, 0.22uF actually), but I didn't put them on the ASCII-art schematic as I though they were 'obvious'. >I have used an LED for the zener, with a 12V regulator you get 13.9V and >an "ON" indicator. I like that. I assume it must be a red LED to drop 1.8V >Mike -- -tony ard12@eng.cam.ac.uk The gates in my computer are AND,OR and NOT, not Bill From amsoft@epix.net Sun Jul 21 18:53:23 1996 Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: 15V too much for mobile radio? Message-ID: <1996Jul16.142437.4479@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4s7cao$deo@piranha.ianet.net> <1996Jul13.080226.26905@ke4zv.atl.ga.us> <4se7qs$kbf@lyra.csx.cam.ac.uk> Date: Tue, 16 Jul 1996 14:24:37 GMT Lines: 37 Xref: news2.epix.net rec.radio.cb:29756 rec.radio.amateur.misc:105279 rec.radio.amateur.equipment:31086 rec.radio.amateur.homebrew:16167 In article <4se7qs$kbf@lyra.csx.cam.ac.uk> ard12@eng.cam.ac.uk (A.R. Duell) wr ites: >gary@ke4zv.atl.ga.us (Gary Coffman) writes: >>Note that the regulator will have to drop 10.2 volts to get from >>24 to 13.8 volts. At 1.5 amps, that's about 16 watts. Heatsink it >>very well. A TO-3 cased regulator might be a better choice (again >>use a mounting kit, you can't ground the case). The added diodes >>need to be rated for the current as well. > >If you're using diodes or zeners to 'jack up' a regulator, they only >carry the (low) current needed by the regulator itself, not the load >current. They don't need to be highly rated. Yeah, that's right. For some reason I was thinking the regulator was a shunt regulator. It isn't, of course. It's a series pass design. So the main current goes from input to output, and very little flows through the reference pin, probably only a couple of mils. I've thought of another thing too. Most of the TO-220 3 terminal regulators can only handle 1 amp. This application needs more current. A solution to that, at the cost of another 0.6 volt, can be had by having the regulator drive the base of a series pass transistor like a 2N3055. Then the regulator transistor handles the heavy current and the 3 terminal regulator only has to handle the output current divided by the beta of the 2N3055, or about 50 times less. The downside is you lose the overcurrent shutdown feature of the 3 terminal regulator when you do this. In this application, a fast fuse should substitute nicely, but another transistor could be added to starve base current to the 2N3055 during overcurrent periods. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Sun Jul 21 18:53:24 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cdsnet.net!news.sprintlink.net!new-news.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!netnews.worldnet.att.net!ix.netcom.com!news From: KD1YV Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: 15V too much for mobile radio? Date: Wed, 17 Jul 1996 21:51:53 -0300 Organization: Hamily Lines: 34 Message-ID: <31ED8AA9.6CE2@ix.netcom.com> References: <4s7cao$deo@piranha.ianet.net> <31e96f8e.0@mothra.westworld.com> <4sck1l$t5p@piranha.ianet.net> <1996Jul16.125042.3848@ke4zv.atl.ga.us> NNTP-Posting-Host: dby-ct1-14.ix.netcom.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-NETCOM-Date: Wed Jul 17 6:51:35 PM PDT 1996 X-Mailer: Mozilla 2.02 (Win16; I) Xref: news2.epix.net rec.radio.cb:29772 rec.radio.amateur.misc:105288 rec.radio.amateur.equipment:31098 rec.radio.amateur.homebrew:16174 Gary Coffman wrote: > > In article alf@kaiwan.com (Alfred Lee) writes : > > > >Years ago (> 10+ years?) I read that it is quite possible to get > >transient spikes up to 80-90 V. Modern vehicular electrical > >system might do better. However, if you know that in some aspects > >the specifications for vehicular electronics system is more > >stringent that Mil Spec, you might get worried. Any one with some > >facts to fill in? > > The vehicle power buss is very dirty. During starting, transients > of 300 volts are not uncommon. Any time an inductive load switches > on or off (a fan motor for example), there will be a nasty spike. > Any electronics used in a vehicle needs suppressors to protect it > from these spikes and surges. That's normally built into equipment > designed to operate in the auto environment. But if you build something > yourself to put in the car, make sure you use adequate suppression > and filtering. I totally agree. The first wiper-delay I built and installed in my '74 Chevy Nova worked perfectly. The second, using the identical circuit, installed in an '8 0 Chevy Malibu was flaky as hell. Turned out that the windshield-wiper motor, when it shut off, was spiking the buss with a huge, negative-going pulse (it blanked my scope ev en on it's highest voltage setting, 100V I think.) That was a low-draw circuit, just a 555 and relay, so I build a simple L-C low -pass filter to clean it up. Neither the L nor the C by itself was enough. Now my question is, with a high draw device such as a transmitter, is there a simple, passive filter that will accomplish the goal? Seems like the series inductor would have to use some pretty hefty gauge wire. 73 de Jim, KD1YV From amsoft@epix.net Sun Jul 21 18:53:25 1996 Path: news2.epix.net!uunet!inXS.uu.net!netnews.worldnet.att.net!hunter.premier.net!op.net!en.com!usenet From: wjs@en.com (Bill Sheehan) Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: 15V too much for mobile radio? Date: Wed, 17 Jul 1996 21:01:44 GMT Organization: Exchange Network Services Lines: 19 Message-ID: <31ed540e.1038020@news.en.com> References: <4s7cao$deo@piranha.ianet.net> <31e77060.1236466@a3bsrv.nai.net> Reply-To: wjs@en.com NNTP-Posting-Host: p14-ts1.en.net X-Newsreader: Forte Agent .99e/16.227 Xref: news2.epix.net rec.radio.cb:29796 rec.radio.amateur.misc:105327 rec.radio.amateur.equipment:31130 rec.radio.amateur.homebrew:16185 ka1jy@usa.nai.net (Brian Ellsworth) wrote: >On 13 Jul 1996 01:31:04 -0400, adkinsg@piranha.ianet.net (Garry P. Adkins) >wrote: > >Hmm, let's see. 24 VDC on the source, 1.5 amps, and 15 vdc out, and a to-220 >case egh? I'd start saving for a nice service manual on that radio if i were >you. When that regulator blows from the 14 watts you attempted to dissipate i t >may fail shorted and put 24 volts into your mobile. Either that or plan on so me >pretty fancy cooling system for that puppy, it's going to get screaming warm. > Shows what you know. Ya big dummy. If you drill a hole in the side of your freezer to run the cords out of, you can put the whole damn power supply in the freezer. Voiler!!! Your heat problem is solved!! Sincerely, Red Greene From amsoft@epix.net Sun Jul 21 18:53:26 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsgate.watson.ibm.com!newsjunkie.ans.net!newsfeeds.ans.net!news.lava.net!news.pixi.com!news.zeitgeist.net!bdt.com!hal.COM!olivea!grapevine.lcs.mit.edu!newsie.dmc.com!news.zipnet.net!usenet From: drgrant@zipnet.net (Mike Capone) Newsgroups: rec.radio.cb,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: 15V too much for mobile radio? Date: Wed, 17 Jul 1996 17:17:23 GMT Organization: ZIPNET.NET - The NorthEast US's premier ISP Lines: 26 Message-ID: <31ed1ff4.1889282@news.zipnet.net> References: <4s7cao$deo@piranha.ianet.net> <4s8iao$2bn@dfw-ixnews9.ix.netcom.com> <4s95cv$ip@piranha.ianet.net> NNTP-Posting-Host: ip48-max1-fitch.zipnet.net X-Newsreader: Forte Agent .99e/32.227 Xref: news2.epix.net rec.radio.cb:29805 rec.radio.amateur.misc:105341 rec.radio.amateur.equipment:31140 rec.radio.amateur.homebrew:16189 On 13 Jul 1996 17:45:03 -0400, adkinsg@piranha.ianet.net (Garry P. Adkins) wrote: :>>There is a very common 15v regulator available, would that :>>be too far above the 13.8? I'm not aware of any 13.8v :>>parts. :> :> :>Through my experience, I would say your fine either way... 12V and :>13.8V have pretty much become interchangable without a problem. :>and if you have a tolerance of 1.8V, and there is no problem, then :>15V should be no problem as well, after all, it's less of a difference :>than 12 and 13.8... As long as you're in the ballpark you should :>be ok. Just don't attempt 24V. :) : :Agreed. I've been wondering... How close to dead-on is a car's :13.8? I bet at low rpm, it gets a bit low... How about on the high :side? Does it ever get up to 15vdc? : :I'll have to plug my dmm into the cig lighter and watch it on a few :trips to see what happens. : I dunno about you- but most the cars I get into have about 14.5V on the plug while running. From amsoft@epix.net Sun Jul 21 18:53:27 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!uunet!in2.uu.net!news3.agis.net!agis!NEWS!not-for-mail From: Bob Lewis Subject: Re: 900 Mhz boost? Message-ID: <31E99AB0.65EE@staffnet.com> Date: Sun, 14 Jul 1996 21:11:12 -0400 References: <4s12rk$hj4@peru.it.earthlink.net> Organization: AA4PB X-Mailer: Mozilla 2.01 (Win95; U) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 9 Kristen Maaherra wrote: > > I live ruraly, and if I could get my 900Mhz phone to go a little farther wou ld > have internet access!!!!! Any pro's out there give me some advice on 900 Mh z > antenna design or bower boost? > > Thanks, > You can e-mail me 'ram@indra.com' of reply here...Adding and antenna or boos ting the power is illegal as the phone will no longer meet FCC specs. From amsoft@epix.net Sun Jul 21 18:53:28 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!nnrp.info.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: wlfuqu00@service1.UKy.EDU (William L. Fuqua III) Newsgroups: rec.radio.amateur.homebrew Subject: AM Modulating Tube Finals With Solid State Audio Amps Date: 16 Jul 96 18:02:41 GMT Organization: ucsd usenet gateway Lines: 37 Message-ID: <199607161802.OAA02035@service1.cc.uky.edu> NNTP-Posting-Host: mail.ucsd.edu Originator: daemon@ucsd.edu Why not try the following circuit to balance out the DC current in the transformer. Modulation PLATE (AF power amp)______ _______| s .p 6.3v E R 115 VOLT PRIMARY #1 C I gnd M FILTERED HV --------|________ --------| | P ----- FILTER CAP R ----- I 115 VOLT | . M PRIMARY #2 GND HV SUPPLY _____________| THE DC CURRENT WILL BALANCE OUT. AND YOU ALSO GET SOME ADDITIONAL FILTERING OF HV. THE DOTS INDICATE THE PHASE OF THE SECONDARIES. THERE SHOULD BE VERY LITTLE RIPPLE CURRENT IN THE PRIMARY IF IT HAS SUFFICIENT INDUCTANCE. NEVER TRIED AN EMAIL BEFORE. 73 BILL William L. Fuqua III P.E. E-mail WLFUQU00@POP.UKY.EDU Phone (606) 257-415 5 Department of Physics and Astronomy CP-177 Chem. Phys. Bldg. University of Kentucky , Lexington, Ky 40506-0055 From amsoft@epix.net Sun Jul 21 18:53:29 1996 Path: news2.epix.net!uunet!in2.uu.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!nntp.coast.net!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.homebrew Subject: Re: AM Modulating Tube Finals With Solid State Audio Amps Date: 15 Jul 1996 17:58:27 GMT Organization: Hewlett Packard Corvallis Site Lines: 47 Distribution: world Message-ID: <4se0s3$kfs@hpcvsnz.cv.hp.com> References: NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Ian White, G3SEK (G3SEK@ifwtech.demon.co.uk) wrote: : Jeff Duntemann wrote: : >Now...turn that around: Could we generate audio power with one of : >these solid state audio amp modules (say 20-50 watts) and pipe the : >audio into the 8-ohm side of one of those output transformers, and : >then use the other side as the modulating output in series with the : >plate of a Class C tube final like a 6146B? .. : >Has anybody tried this? Are there any nonobvious gotchas I haven't : >thought of yet? : > : 'Fraid so. The core of a modulation transformer is designed to carry the : DC current to the PA, which an ordinary AF output transformer isn't. : I guess it could work, but you'd need to under-run the transformer very : considerably from its normal audio rating, to avoid core saturation. : Using an AF transformer with a higher power rating would also help with : any possible insulation problems. The way that old plate-modulated AM broadcast transmitters worked was to avoid running the DC through the modulation transformer; I imagine it helped a lot in achieving low distortion levels. You run the DC through a good audio choke, and couple the modulation transformer to the RF_PA end of the choke with a capacitor. This also removes DC from the transformer "secondary" so there would be less liklihood of any insulation problems, but there really weren't any anyway, since the transformer was designed to have the "secondary" (originally primary) driven by plate voltage plus audio anyway. Finding an appropriate choke (and capacitor) might be some fun. They were often the largest components in an AM broadcast transmitter, larger than the power transformer and filter caps and choke. Solid state amplifiers typically don't care _very_ much (compared with tube amps) about what load impedance they see, so long as you don't exceed their current capability; but it would be fairly important to use a design that really could put out the power. Typical audio power in a hi-fi system is much below the peak power the amplifier is capable of, and you'd want to make sure the design (including things like heat sinking) was appropriate for the average and peak power you'd need for modulation. -- Cheers, Tom tomb@lsid.hp.com From amsoft@epix.net Sun Jul 21 18:53:30 1996 Path: news2.epix.net!uunet!inXS.uu.net!spool.mu.edu!munnari.OZ.AU!news.mel.connect.com.au!news.uwa.edu.au!disco.iinet.net.au!opera.iinet.net.au!news From: richardh@iinet.net.au (Richard Hosking) Newsgroups: rec.radio.amateur.homebrew Subject: Re: AM Modulating Tube Finals With Solid State Audio Amps Date: Thu, 18 Jul 1996 13:33:50 GMT Organization: iiNet Technologies Pty Ltd Lines: 21 Message-ID: <4sle1c$l38@opera.iinet.net.au> References: <4s6rit$qlc@globe.indirect.com> Reply-To: richardh@iinet.net.au NNTP-Posting-Host: grunge211.nv.iinet.net.au X-Newsreader: Forte Free Agent 1.0.82 jeffd@coriolis.com (Jeff Duntemann) wrote: >Here's a notion I had a long time ago and haven't gotten around to >trying... Jeff What about trying a pulse width modulation system which is what the commercial AM stations do nowadays.(so I understand) The audio is converted to a digital signal of pulses (at say 100KHz) with width proportional to the audio voltage. These drive a high voltage FET switching the plate voltage. The FET is follwed by a suitable low pass filter to get rid of the 100 KHz sidebands. (I must admit I havent done this however) I have a hankering to get on 80 metres AM... Richard VK6BRO richardh@iinet.net.au http://www.iinet.net.au/~richardh From amsoft@epix.net Sun Jul 21 18:53:31 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: dougt@rsa.cirrus.COM (Doug Thomson) Newsgroups: rec.radio.amateur.homebrew Subject: AM Modulation with SS Amps. Date: 19 Jul 96 13:35:17 GMT Organization: ucsd usenet gateway Lines: 18 Message-ID: <199607191334.AA10521@rsa.rsa.cirrus.com> NNTP-Posting-Host: mail.ucsd.edu Originator: daemon@ucsd.edu I have done this using a filament power transformer run backwards. A 5.0 V secondary filament X-former with a 120 V pri, has a turns ratio of approx. 24 to 1. Now runing it backswards and feeding the output of a solid state amp @ 8 ohms gives an output impedance of 4.6 K (the square of the turns ratio times the pri impedance). A 6146 running at 750 v and 150 ma needs a 5K laod, pretty close. If the filament X-former is rated at 4A secondary, the pri current is 166 ma. Using a power x-former allows for load current to follow without saturating the core. The frequency response is not very good, the power x- former was designed to run at 60Hz, but I found that most x- former gave 2+ Khz top end, plenty good for AM, as a mater of fact the bandwidth need to be limited from the SS bandwidth of greater than 20 Khz. Hope this helps. 73s Douglas K. Thomson, KB4OQO E-mail: d.k.thomson@ieee.org From amsoft@epix.net Sun Jul 21 18:53:32 1996 Path: news2.epix.net!uunet!inXS.uu.net!nntp.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e2a.gnn.com!pop.gnn.com!k1epj From: k1epj@gnn.com (DAVID R LEDUC) Newsgroups: rec.radio.amateur.homebrew Subject: Antenna for 2 Meters Date: Fri, 19 Jul 1996 21:23:23 Organization: GNN Lines: 9 Message-ID: <4soucp$2o5@news-e2b.gnn.com> NNTP-Posting-Host: 70-137.client.gnn.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" X-GNN-NewsServer-Posting-Date: 19 Jul 1996 21:23:37 GMT X-Mailer: GNNmessenger 1.3 I'm waiting for the UPS truck to arrive with my DR-1200 and KPC-3 and trying to decide what I should put up for an antenna. The closest BBS is 5 miles away and the closest DX packet cluster is about 20 miles away. I have quite a bit of experience with building HF antennas but zero experience with VHF. Anyone have any suggestions? Thanks Dave LeDuc K1EPJ From amsoft@epix.net Sun Jul 21 18:53:33 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!gatech!usenet.eel.ufl.edu!news.ultranet.com!zombie.ncsc.mil!nntp.coast.net!news-res.gsl.net!news.gsl.net!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: B&W Coil Stock Supplier Date: 18 Jul 1996 07:45:38 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 13 Sender: root@newsbf02.news.aol.com Message-ID: <4sl852$kki@newsbf02.news.aol.com> References: <4se5tb$add@itnews.sc.intel.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4se5tb$add@itnews.sc.intel.com>, Cecil Moore writes: > >Surplus Sales of Nebraska advertises such in QST. (402)346-4750 > >73, Cecil, W6RCA, OOTC (not speaking for my employer) Ameritron also stocks some sizes at a more reasonable price. Surplus Sales must have high overhead. 73 Tom From amsoft@epix.net Sun Jul 21 18:53:34 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.net66.com!jolt.pagesat.net!ossi.com!newsfeed1.aimnet.com!nntp.primenet.com!news.cais.net!hunter.premier.net!newsfeed.internetmci.com!news.sprintlink.net!news-stk-200.sprintlink.net!itnews.sc.intel.com!news From: Cecil Moore Newsgroups: rec.radio.amateur.homebrew Subject: Re: B&W Coil Stock Supplier Date: Thu, 18 Jul 1996 08:03:51 -0700 Organization: Intel Corp., Chandler, AZ Lines: 9 Message-ID: <31EE5257.29D@sedona.intel.com> References: <4se5tb$add@itnews.sc.intel.com> <4sl852$kki@newsbf02.news.aol.com> NNTP-Posting-Host: cmoore.ch.intel.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win16; I) W8JI Tom wrote: > Ameritron also stocks some sizes at a more reasonable price. Hi Tim, what diameter, wire size, TPI, and inductance would you recommend for the loading coil in an elongated 75m mobile antenna with lots of top hat capacitance? thanks and 73, Cecil, W6RCA, OOTC (not speaking for my employer) From amsoft@epix.net Sun Jul 21 18:53:34 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!portal.gmu.edu!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: ps7ab@digi.COM.BR (Ronaldo Reis) Newsgroups: rec.radio.amateur.homebrew Subject: Brazil Ham radio Date: 17 Jul 96 14:32:59 GMT Organization: Natal City (Brazil) Lines: 17 Message-ID: <31ECF99B.4DC3@digi.com.br> NNTP-Posting-Host: mail.ucsd.edu Originator: daemon@ucsd.edu Natal City, Brazil, July/96 Hi my friend: Please, call on and divulge the BRAZIL HAM PAGE, in the following URL: http://www.digi.com.br/users/brazil/ps7ab.html The page is in english and portuguese, and my intent is to provide a safe site to access a wide variety of information about Radioamateur and SWL in Brazil. Mny tnks, 73. PS7AB, Rony. ps7ab@digi.com.br From amsoft@epix.net Sun Jul 21 18:53:35 1996 Path: news2.epix.net!uunet!inXS.uu.net!ott.istar!istar.net!tor.istar!east.istar!news From: Shawn Kubik Newsgroups: rec.radio.amateur.homebrew Subject: buidling a transmiter Date: Thu, 18 Jul 1996 18:52:39 -0700 Organization: The Web Creation People Lines: 5 Message-ID: <31EEEA66.5B2B@mailhost.oxford.net> NNTP-Posting-Host: burgessville-138.oxford.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5a (Win16; I) I am looking for plans to build a FM Transmiter. I realy what plans for a transmiter no mater how big or small thanks From amsoft@epix.net Sun Jul 21 18:53:36 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.clark.net!mr.net!chi-news.cic.net!cs.utexas.edu!math.ohio-state.edu!uwm.edu!news-res.gsl.net!news.gsl.net!hunter.premier.net!uunet!inXS.uu.net!news.nkn.net!dfw.nkn.net!news.startext.net!news From: Leslie Guinn Newsgroups: rec.radio.amateur.homebrew Subject: cb to 10 meter Date: Sat, 20 Jul 1996 14:52:20 -0700 Organization: StarText department of the Fort Worth Star Telegram Lines: 8 Message-ID: <31F15514.7A9A@startext.net> NNTP-Posting-Host: dial2-17.startext.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win95; I) how do you convert a cb to 10 meter. I have an old realistic 23-plus cb i would like to convert Thanks Leslie.... From amsoft@epix.net Sun Jul 21 18:53:37 1996 Path: news2.epix.net!uunet!in2.uu.net!comp.vuw.ac.nz!topnz.ac.nz!news From: Jim Newsgroups: rec.radio.amateur.homebrew Subject: Re: cell phone conversion Date: Thu, 18 Jul 1996 01:09:44 -0700 Organization: The Open Polytechnic of New Zealand Lines: 27 Message-ID: <31EDF148.A98@nzart.org.nz> References: <31E81784.5D27@flash.net> <31EB120B.143E@eng.clemson.edu> NNTP-Posting-Host: dial271139.topnz.ac.nz Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win16; I) Michael Herring wrote: > > Danny Williams wrote: > > > > Has anyone considered on done a conversion of an old cellular phone to a > > 900 mhz. ham tranceiver? Any thoughts or comments appreciated. > > Danny > > KB5WER > I have. I have a friend who has. I'm working on it here. > 73 > de ke4rgyMichael. I have read the above with interest. It seems possible to poke the right numbers into the phone to get the right frequencies, but how do you adjust the filters at the antenna end to bring the sets out of the phone band and into the ham bend? You just about wreck them extracting them and pulling them apart, and then you have to trim the metallisation to pull the filters over to the right frequencies. Perhaps you can purchase replacement filters??? 73, Jim.parnell@nzart.org.nz ZL2APE@ZL2WA.#60.NZL.OC From amsoft@epix.net Sun Jul 21 18:53:38 1996 Path: news2.epix.net!uunet!in2.uu.net!news.iag.net!newsfeeder.sdsu.edu!newspump.sol.net!daily-planet.execpc.com!net.digalogsys.com!rick From: Rick Miller Newsgroups: rec.radio.amateur.homebrew Subject: Cheap Rig for New Tech-Plus? Date: Mon, 15 Jul 1996 09:31:17 -0500 Organization: Exec-PC BBS - Milwaukee, WI Lines: 28 Message-ID: Reply-To: rdmiller@execpc.com NNTP-Posting-Host: deneb.execpc.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Hi! I finally got back into ham radio by getting my Tech-plus license this weekend! I was tired of kicking myself in the pants for letting the license I got when I was 12 years old expire. :-) With Navy morse training and an Electrical Engineering education, it was a *breeze*! I'll probably upgrade later this year, my testing being limited by the 4-year-old son I had along and the wife waiting impatiently for me to come home. So here I am, a new Tech-plus without a rig. I'd like to build something simple (and *dirt* *cheap*) that I can operate until I can scrape up enough "mad-money" to buy a 2-meter handheld. CW-only is *fine*. I even still have the straight key I got when I was twelve, in good condition too. Does anyone have any suggestions where I might find easy-n-cheap plans or kits? I just want to be able to get on the air *somehow* until my hobby fund can afford something nicer. (Any response from anyone familiar with Milwaukee-area repeaters would be *doubly* appreciated!) Rick Miller (test passed, call unknown) -------------------------------------------------------------------------- Raportisto demandis de Mahatma Gandhi, "Sr-o. Gandhi, kio vi pensas pri Okcidenta Civilizacio?" Li respondis, "Mi pensas ke gxi estus bona ideo." From amsoft@epix.net Sun Jul 21 18:53:39 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: crystal radio Message-ID: <1996Jul14.205016.5574@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <31E9841B.203B@pos.co.il> Date: Sun, 14 Jul 1996 20:50:16 GMT Lines: 41 In article <31E9841B.203B@pos.co.il> Shimon Hirschhorn writ es: >A couple of weeks ago I bought my eight year old a crystal radio kit. >He loved building it. The problem is the reception is terrible. I >fixed him up a ground plug that plugs in to the ground of the electric >socket, and a antenna that attaches into the cable radio antenea. The >reception is still terrible. He recieves all the stations at once. I >saw the message thread on the razor blade radio, and we are going to >give it a try. The only selectivity a classic crystal set has is the loaded resonance of the antenna. To improve selectivity, you have to improve the Q of the antenna. About all you can do is use a resonant length (halfwave), and mount it high and in the clear to minimize losses. That'll give you the best Q with the most signal. The coil in a crystal set is a loading coil for the antenna which allows you to resonate it at various frequencies by adjusting the sliding tap. But as with any coil loaded antenna, losses are least when the coil is smallest and the antenna is closest to natural resonant length. If signals are strong, you can change to a loose coupler circuit to gain selectivity. In this case you add a capacitor in parallel with the coil to form a resonant tank at the frequency of interest and loosely link couple the antenna to the tank. This will, of course, knock signal levels way down, but selectivity will be much better. That's because loading on the antenna and tank are less, due to the loose link coupling, so the loaded Q is higher. If signals are *really* strong, you can use two tank circuits, with loose coupling between them, to improve selectivity even more. When you get to three or more coupled tanks, selectivity starts to become reasonable, but signal levels become very small due to the loose coupling. So you want to add amplifier stages between the tuned circuits. Now you have a TRF receiver (another old classic), but of course now you need to power it. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Sun Jul 21 18:53:40 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: crystal radio Message-ID: <1996Jul16.134946.4241@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <31E9841B.203B@pos.co.il> <1996Jul14.205016.5574@ke4zv.atl.ga.us> <31EA8D93.674@pos.co.il> Date: Tue, 16 Jul 1996 13:49:46 GMT Lines: 83 In article <31EA8D93.674@pos.co.il> Shimon Hirschhorn write s: >Gary Coffman wrote: >> The only selectivity a classic crystal set has is the loaded resonance of >> the antenna. To improve selectivity, you have to improve the Q of the >> antenna. About all you can do is use a resonant length (halfwave), >> ........ > >I appreciate the help. I will try a simpler antenea. I want to avoid a >powered set if I can. What my son finds so interesting about the set is > that it works as if by magic. He can accept that a sophisticated >electronic device can do almost anything. That a crystal set without >even a battery works is amazing. BTW, most of my co-workers who are >fairly educated sofware people are sure that I am lying about a >non-powered radio. > >I still would like to find a better kit if I can. I want to keep my >sons interest in electronics up. Small projects that he can do with >little help like a crystal set fit the bill. Not having it attached to >the AC kepps my wife calm about the matter. Ok, here's a classic loose coupled design. The coil can be an old loopstick out of a discarded AM radio, and the variable capacitor can be from a discarded AM set as well. ___ Ant \|/ | 1N34 | -----x------->|----x----------> | || ( | | | || ( = 365pf var = .1 uf to high impedance headphones | || ( | | Link-> ) || (----x-------------x----------> | _|_ Gnd /// The link should be a couple of turns around one end of the loopstick. You can vary the number of turns on the link and the position of the turns on the coil to vary coupling, and hence selectivity. Now if you add a second tank like this ANT GND | | D1 ---)||( | ||(--x------->|----x--------> | )||(--x ||( | | C1 = )|| ||( = C2 = C3 to headphones | )||(-------)||( | | x--|||(-------)||x--x-------------x--------> L1 Link L2 Now you have one tank, L1, C1, which has the antenna link coupled to it as before, but now that tank also has a link coupled to a second tank, L2, C2, which you also resonate. By varying the number and positions of the turns on the antenna link, the first tank link, and the second tank link, you can make tradeoffs between sensitivity and selectivity. D1 is your "crystal". That can be an actual crystal, or a germanium diode like a 1N34. C3 is a RF bypass capacitor to close the circuit, anything from .001 to .1 uf should work. Now if you insert a transistor RF amplifier in the link, you'll have a TRF receiver. A simple amp powered by a battery will work fine. This may be needed if signal levels are too low at the headphones. You can also add a battery powered audio amp and drive a loudspeaker instead of headphones. These would be the obvious next steps after building the crystal set. You don't need to fool with AC power. (Note there are better ways than the TRF if you decide to go with amplification. The real next obvious step would be to build a regenerative receiver. I won't even attempt to draw that with ASCII art, but it can be done with only 2 transistors.) Note that a good way to build these circuits is breadboard fashion. Use a real breadboard (a pine plank). Draw the circuit on the plank, drive brass brads at each connection point, and install and wire the components to these brads. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Sun Jul 21 18:53:41 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!tank.news.pipex.net!pipex!hole.news.pipex.net!pipex!news.be.innet.net!INbe.net!news.nl.innet.net!INnl.net!hunter.premier.net!news1.erols.com!news From: Jake Brodsky Newsgroups: rec.radio.amateur.homebrew Subject: crystal radio earphones Date: Tue, 16 Jul 1996 11:33:04 -0700 Organization: Wheeeeee! Lines: 7 Message-ID: <31EBE060.4B22@erols.com> References: <31E9841B.203B@pos.co.il> <1996Jul14.205016.5574@ke4zv.atl.ga.us> <31EA8D93.674@pos.co.il> NNTP-Posting-Host: dam-as4s31.erols.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win16; I) Anyone know a good source for those high impedance crystal earphones like they used to put in crystal radio kits about 20 years ago? 73, Jake Brodsky, AB3A "Beware of the massive impossible!" From amsoft@epix.net Sun Jul 21 18:53:42 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!news-fw-12.sprintlink.net!news.dgsys.com!tahiti.netreach.net!chesco.com!news.jersey.net!news.win.bright.net!news.bright.net!chil4-cs-13.dial.bright.net!user From: protect@bright.net (Charles) Newsgroups: rec.radio.amateur.homebrew Subject: Re: crystal radio earphones Date: Tue, 16 Jul 1996 15:23:01 -0400 Organization: BrightNet Ohio Lines: 16 Message-ID: References: <31E9841B.203B@pos.co.il> <1996Jul14.205016.5574@ke4zv.atl.ga.us> <31EA8D93.674@pos.co.il> <31EBE060.4B22@erols.com> NNTP-Posting-Host: chil4-cs-13.dial.bright.net In article <31EBE060.4B22@erols.com>, Jake Brodsky wrote: > Anyone know a good source for those high impedance crystal earphones > like they used to put in crystal radio kits about 20 years ago? > > 73, > > Jake Brodsky, AB3A Yes Try Antique Electronic Supply, 6221 S. Maple Ave., Tempe, AZ 85283 Phone 602-820-5411. They have phones and all other parts to build crystal radions the old fashioned way, along with good crystal kits. I do not work for them. Hope this helps. Charles From amsoft@epix.net Sun Jul 21 18:53:43 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.zeitgeist.net!bdt.com!hal.COM!news.ucsc.edu!helios.ucolick.org!sutin From: sutin@helios.ucolick.org (Brian Sutin) Newsgroups: rec.radio.amateur.homebrew Subject: CW Crystal Filters & AGC Chips Date: 17 Jul 1996 20:28:41 GMT Organization: Lick Observatory UCSC Lines: 18 Message-ID: <4sjidp$2ud@darkstar.ucsc.edu> NNTP-Posting-Host: helios.ucolick.org I intend to homebrew a 50 MHz CW tranceiver out of block parts, and then upgrade the pieces as I go. The parts I can't find easily are the filters and the AGC circuit. I am looking for a small-quantity supplier for CW (500 Hz) crystal filters, preferably near 25-30 MHz, but 8-10 MHz or elsewhere is ok. I will design around what I can find. I am also looking for an AGC chip -- a chip with the IF amp and an audio input, which does all of the AGC computations internally. I don't know if these exist (perhaps as part of a larger circuit). Thanks! Brian Sutin KD6TLA sutin@ucolick.org Lick Observatory, UCSC Santa Cruz, CA 95064 Fred: "May I rescue you?" `Top Hat,' RKO 1935 Ginger: "No, thank you. I prefer being in distress." From amsoft@epix.net Sun Jul 21 18:53:44 1996 Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news From: A Guy named Moe Newsgroups: rec.radio.amateur.homebrew Subject: Diagram Plans Date: Fri, 19 Jul 1996 23:55:28 -0700 Organization: ************** Lines: 5 Message-ID: <31F082E0.73FD@mailhost.oxford.net> NNTP-Posting-Host: burgessville-157.oxford.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5a (Win16; I) Does anyone have or know were to get plans to build good quality FM or AM transistors? thanks From amsoft@epix.net Sun Jul 21 18:53:45 1996 Path: news2.epix.net!uunet!in2.uu.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!swrinde!cs.utexas.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!mozo.cc.purdue.edu!news From: Mark Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: Digital Microwave Radio Date: Fri, 19 Jul 1996 09:11:03 -0500 Organization: Purdue University Lines: 15 Message-ID: <31EF9777.5E64@expert.cc.purdue.edu> References: <4smur8$8r4@agate.berkeley.edu> NNTP-Posting-Host: expert.cc.purdue.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.02 (Win95; I) Xref: news2.epix.net rec.radio.amateur.homebrew:16198 rec.radio.amateur.digital.misc:16536 Nick Kralevich wrote: > I have the unique fortune of living about 1000 ft (0.2 miles, or 330 > meter) away from an internet service provider. I've been working with > this provider for quite some time, and I want to setup a full time > link to them. I am hoping that this will be a high speed link > (1/2 T1 speed). Laying actual wire is out of the question, because it > crosses heavily used roads. This won't work on amateur frequencies, as the transmissions comming from the internet would most likely contain material from non-amateurs and could also be made up of content unsuitable for transmission on the amateur bands. Mark From amsoft@epix.net Sun Jul 21 18:53:46 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!newshub.csu.net!newsserver.sdsc.edu!usenet From: teazes@gat.com (Stewart Teaze) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: Digital Microwave Radio Date: 19 Jul 1996 20:56:43 GMT Organization: ASI Lines: 34 Message-ID: <4sosqb$n69@rosebud.sdsc.edu> References: <4smur8$8r4@agate.berkeley.edu> <31EF9777.5E64@expert.cc.purdue.edu> NNTP-Posting-Host: 141.248.174.218 X-Newsreader: WinVN 0.92.1 Xref: news2.epix.net rec.radio.amateur.homebrew:16201 rec.radio.amateur.digital.misc:16542 In article <31EF9777.5E64@expert.cc.purdue.edu>, Mark says: > >Nick Kralevich wrote: > >> I have the unique fortune of living about 1000 ft (0.2 miles, or 330 >> meter) away from an internet service provider. I've been working with >> this provider for quite some time, and I want to setup a full time >> link to them. I am hoping that this will be a high speed link >> (1/2 T1 speed). Laying actual wire is out of the question, because it >> crosses heavily used roads. > >This won't work on amateur frequencies, as the transmissions comming >from the internet would most likely contain material from non-amateurs >and could also be made up of content unsuitable for transmission on >the amateur bands. > >Mark As long as one could reasonably ensure the transmissions were compliant, there should not be a problem. For example e-mail forwarding should be OK(3rd party traffic, right?), but reading alt.sex.xxx newsgroups containing profanity or business spams probably shouldn't be OK. The only REAL Part 15 argument that could work against your link, would be that it would be BYPASSING a viable commercial means of communications; the telephone. However, if you kept a web page that was up 24hrs/day, you can argue that it is not reasonable to keep a telephone link operational 24hrs/day, and so you would not be bypassing a commercial system. However, why worry about amateur compliance anyway? The 900mhz band is now available for public data communications use, and would probably work for Nick's application. From amsoft@epix.net Sun Jul 21 18:53:47 1996 Path: news2.epix.net!uunet!in2.uu.net!world1.bawave.com!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!zombie.ncsc.mil!newsgate.duke.edu!agate!nickkral From: nickkral@america.CS.Berkeley.EDU (Nick Kralevich) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: Digital Microwave Radio Date: 19 Jul 1996 23:15:07 GMT Organization: Electrical Engineering Computer Science Department, University of California at Berkeley Lines: 40 Message-ID: <4sp4tr$bhu@agate.berkeley.edu> References: <4smur8$8r4@agate.berkeley.edu> <4snmlr$1kn4@mule2.mindspring.com> NNTP-Posting-Host: america.cs.berkeley.edu Xref: news2.epix.net rec.radio.amateur.homebrew:16203 rec.radio.amateur.digital.misc:16544 In article <4snmlr$1kn4@mule2.mindspring.com>, Bob Merritt wrote: >Go to the nearest ham radio store and buy a copy of the ARRL Handbook >for Radio Amateurs and then read up on the 10Ghz Gunnplexor/2MBPS >project.... Will do! >You can also get a jumpstart by checking out the various links from my >web pages on high speed packet.... >http://www.mindspring.com/~bobm Will do! :) >Oh the >guys over in Utah have put together a T1 system, do a search to find >more info on it... Do you have a hint for what to search for? >also you might want to check out "off the shelf" >solutions with things like the WaveLan cards.... I was hoping to avoid "off the shelf" solutions due to their high cost. Besides, it would be interesting to experiment with building equipment like this. >Realistically, using the new WA4DSY 56k RF modems may be what you >need.... I'll look into that too. Thanks for all the info! Oh, one more question. Do you have any idea how much this type of project would cost? Take care, -- Nick Kralevich nickkral@cory.eecs.berkeley.edu From amsoft@epix.net Sun Jul 21 18:53:49 1996 Path: news2.epix.net!uunet!in2.uu.net!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.nidlink.com!usenet From: "Thor Wiegman" Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: Digital Microwave Radio Date: Fri, 19 Jul 1996 22:47:54 -0700 Organization: NetLink, Inc. Lines: 48 Message-ID: <01bb75ff.88cf0700$0b4960ce@thorw.nidlink.com> References: <4smur8$8r4@agate.berkeley.edu> NNTP-Posting-Host: pm4-2.nidlink.com X-Newsreader: Microsoft Internet News 4.70.1085 Xref: news2.epix.net rec.radio.amateur.homebrew:16209 rec.radio.amateur.digital.misc:16551 : nickkral@america.CS.Berkeley.EDU (Nick Kralevich) wrote in article <4smur8$8r4@agate.berkeley.edu>... : I have the unique fortune of living about 1000 ft (0.2 miles, or 330 : meter) away from an internet service provider. I've been working with : this provider for quite some time, and I want to setup a full time : link to them. I am hoping that this will be a high speed link : (1/2 T1 speed). Laying actual wire is out of the question, because it : crosses heavily used roads. : : I read on rec.radio.amateur.digital.misc that a microwave transmitter : and receiver combo would be the ideal solution to this problem. : In addition to being low cost, it also gives the necessary range and : high speed performance for what I need (this is what I read...). : : I'm guessing that I have to design my own setup for this type : of thing. Actually, I would prefer to do my own construction of : this microwave transmitter, since it would give me good experience : dealing with microwave circuits (I'm a recent graduate of UC Berkeley : with a bachleors degree in Electrical Engineering and Computer Science). : : I've been doing a lot of internet research, in addition to going : to book stores and libraries to find a design for this type of thing. : Unfortunately, I can't find any design online or in books. : : Does anyone know of a design for a digital microwave transmitter/receiver : combo that is available on the internet or in book form? Or : perhaps I'm going about this in the wrong direction... : : Once I got the hardware in place, I could handle the IP routing : myself. (I'm great with software, but not quite as good with hardware). : : Any suggestions would be appreciated. As my boss always says "why re-invent the wheel?" Western Multiplex makes a little SS unit for 2GHz called the Lynx. These are showing up on the surplus market because for high reliablilty/quality most cell techs don't like them (a matter of personal taste). I would think that picking up a used pair of these would be cheaper and easier than building something unless you're looking for the experience. These units don't require a license for operation as they are covered under part 15. I've put up 40 mile hops with them (using 8 foot high performance dishes) so I would think that a pair of homebrew yagi's would get the job done for you. From amsoft@epix.net Sun Jul 21 18:53:49 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-stk-3.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!nntp.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!malgudi.oar.net!usenet From: Paul Knight Newsgroups: rec.radio.amateur.homebrew Subject: FAR Circuits Address Date: Wed, 17 Jul 1996 16:00:57 -0700 Organization: Eaton Corp., Appliance Controls Lines: 13 Message-ID: <31ED70A9.6EC6@elec.ctl.etn.com> NNTP-Posting-Host: firewall.etn.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win16; U) Greetings! Could someone drop me a note with the address for FAR Circuits, the Illinois-based PC board vendor who develops many of the boards found in QST projects? -- Thanks! Paul Knight WD8DKY pknight@elec.ctl.etn.com -or- PEKnSLK@aol.com From amsoft@epix.net Sun Jul 21 18:53:50 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!nntp.primenet.com!uunet!inXS.uu.net!csnews!coopnews.coop.net!news.den.mmc.com!NewsWatcher!user From: thomas.g.booth@den.mmc.com (Booth, Thomas G) Newsgroups: rec.radio.amateur.homebrew Subject: Re: FAR Circuits Address Followup-To: rec.radio.amateur.homebrew Date: 18 Jul 1996 20:57:46 GMT Organization: A Turbulent One Lines: 7 Distribution: na Message-ID: References: <31ED70A9.6EC6@elec.ctl.etn.com> NNTP-Posting-Host: 160.205.101.24 FAR Circuits 18N640 Field Court Dundee, Ill. 60118 TGB \\ The opinions expressed herein are my own. // From amsoft@epix.net Sun Jul 21 18:53:51 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!feemsa.toddalan.com!news.sprintlink.net!news-dc-9.sprintlink.net!news.nevada.edu!news.tamu.edu!bcm.tmc.edu!cs.utexas.edu!swrinde!howland.reston.ans.net!Germany.EU.net!wizard.pn.com!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Jon Bloom Newsgroups: rec.radio.amateur.homebrew Subject: Re: FAR Circuits Address Date: Fri, 19 Jul 1996 11:59:51 -0400 Organization: American Radio Relay League Lines: 16 Message-ID: <31EFB0F7.244D@arrl.org> References: <31ED70A9.6EC6@elec.ctl.etn.com> NNTP-Posting-Host: mgate.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.02 (Win95; I) Booth, Thomas G wrote: > > FAR Circuits > 18N640 Field Court > Dundee, Ill. 60118 > > TGB FAR Circuits now has a Web page, too: http://www.cl.ais.net/farcir/ -- Jon Bloom, KE3Z | jbloom@arrl.org American Radio Relay League | 225 Main St., Newington CT 06111 | From amsoft@epix.net Sun Jul 21 18:53:52 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!news.nl.innet.net!INnl.net!news.be.innet.net!INbe.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!math.ohio-state.edu!uwm.edu!newsfeed.internetmci.com!inXS.uu.net!news.new-york.net!news2.new-york.net!not-for-mail From: Raymond Hoopes Jr Subject: FS : Radio Equipment Content-Type: text/plain; charset=us-ascii X-Nntp-Posting-User: (Unauthenticated) Content-Transfer-Encoding: 7bit Message-ID: <31EC2452.2188@southerntier.com> X-Mailer: Mozilla 2.02 (Win16; I) Mime-Version: 1.0 X-Trace: 837795986/21993 X-Nntp-Posting-Host: southerntier.com Date: Tue, 16 Jul 1996 23:22:58 GMT Lines: 11 Transciever 736R Yaesu with Microphone / New Antennas 2M and 70CM yagi SWR Meter Dummy Load Approx. 60 Feet 6013 coax PK 88 packet Modem/New with 24v power supply For Sale for $1800 or most offer. E-Mail : sysop@southerntier.com Phone : 716-973-3431 Raymond Hoopes Sr. From amsoft@epix.net Sun Jul 21 18:53:53 1996 Path: news2.epix.net!uunet!in2.uu.net!spool.mu.edu!munnari.OZ.AU!news.mel.connect.com.au!news.uwa.edu.au!disco.iinet.net.au!opera.iinet.net.au!news From: richardh@iinet.net.au (Richard Hosking) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ham-Homebrew Date: Sat, 20 Jul 1996 05:02:19 GMT Organization: iiNet Technologies Pty Ltd Lines: 17 Message-ID: <4spoqb$ic8@opera.iinet.net.au> References: <199607171835.AA09388@rsa.rsa.cirrus.com> Reply-To: richardh@iinet.net.au NNTP-Posting-Host: grunge244.nv.iinet.net.au X-Newsreader: Forte Free Agent 1.0.82 dougt@rsa.cirrus.COM (Doug Thomson) wrote: > Do you have a website, and if so, what is the address. > Tns. > Douglas Thomson, dougt@rsa.cirrus.com > Check the Perth Radio Experimenters group http://www.iinet.net.au/~richardh New articles due soon when I get this DDS system going! Richard Hosking VK6BRO richardh@iinet.net.au http://www.iinet.net.au/~richardh From amsoft@epix.net Sun Jul 21 18:53:54 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp.primenet.com!news.cais.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!sgigate.sgi.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!swrinde!sdd.hp.com!inn From: Tiger X-term Newsgroups: rec.radio.amateur.homebrew Subject: Has anyone modded a Rejunkcy RTE-202 to 900 mhz? Date: 19 Jul 1996 04:39:40 GMT Organization: Hewlett Packard, San Diego Division Lines: 7 Message-ID: <4sn3ic$gfc@news.sdd.hp.com> NNTP-Posting-Host: hpsdsv05.sdd.hp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12 (X11; I; HP-UX A.09.05 9000/755) X-URL: news:rec.radio.amateur.homebrew Has anyone out there done the mod to make the Regency RTE-2020 go to 900 mhz ham bands? I've heard it can be done. Can anyone help? Thanks..Don. From amsoft@epix.net Sun Jul 21 18:53:54 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!mac208.ed.uiuc.edu!user From: uno@cs.uiuc.edu (Y. Doug Uno) Newsgroups: rec.radio.amateur.homebrew Subject: Heathkit toroids Date: Sun, 14 Jul 1996 13:50:25 -0500 Organization: University of Illinois Lines: 16 Message-ID: NNTP-Posting-Host: mac208.ed.uiuc.edu Greetings, I am about to attempt to replace the toroids in the receive section of an HW-8 that I acquired a while back. I have a catalog from Amidon Co. in Santa Ana, CA and it looks like they have what I'll need. Any advice on do's and don'ts in making and installing a toroid in an old radio? Thanks in advance for your help. 73 de Ray, WA9AXL Urbana, IL raybo@uiuc.edu -- Y. Doug Uno e-mail: uno@cs.uiuc.edu University of Illinois 1304 W. Springfield Ave. Room 2413 Urbana, IL 61801 From amsoft@epix.net Sun Jul 21 18:53:55 1996 Path: news2.epix.net!uunet!in2.uu.net!world1.bawave.com!newsfeed.internetmci.com!btnet!zetnet.co.uk!usenet From: Frank Dinger Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help - setting up a 6m station Date: Mon, 15 Jul 1996 21:00:30 +0100 Lines: 23 Message-ID: <1996071521003070432@zetnet.co.uk> References: <4sbpcf$6gp@mulgave.octacon.co.uk> NNTP-Posting-Host: piccadilly.zetnet.co.uk X-Mailer: ZIMACS Version 1.09u 10001740 > I would appreciate any inputs regarding setting up a 50MHz station > for the least possible cost. I have a Yaesu FT757GX MK2 and I am > therfore interested in transverters, amplifiers, antennas etc. > Any advice at all please send to my e-mail address. > Russ > G7AXN ================ Russell, For an excellent 50 MHz transverter and ditto for4m, 2m and 70cms ,I recommend :The VHF/UHF DX Book , edited by Ian White, G3SEK . It includes a chapter by G4HUP ,'A high performance 50 MHz transverter', pages 9-2 to 9-19. There are also chapters on antennas ,linear amplifiers etc. A really excellent book for the home constructor. Publisher: DIR Publishing , ISBN 0 9520468 0 6. You can check availability with Ian White ,G3SEK e-mail:g3sek@ifwtech.demon.co.uk Success with the transverter ,best wishes Frank , Inver by Tain , Ross-shire - Scotland UK e-mail : gm0csz.kn6wh@ukrs.org Packet : GM0CSZ @ GB7NOS.#76.GBR.EU From amsoft@epix.net Sun Jul 21 18:53:56 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!news.msfc.nasa.gov!sol.ctr.columbia.edu!news.ess.harris.com!usenet From: Paul Anderson Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help!!! Phone # for Jan crystals .......????? Date: Thu, 18 Jul 1996 04:50:50 -0700 Organization: Harris Corp Lines: 18 Message-ID: <31EE251A.7230@harris.com> References: <01bb7440.67619d00$d5681fce@vigilant> NNTP-Posting-Host: pander01.ess.harris.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win16; I) To: vigilant vigilant wrote: > > Does anyone out there have the phone number for jan crystals????? I found > them listed on the net but when I went to the address...they weren't > there....I am guessing that they "moved" their site or went out of > business or something......................................thanks in > advance. Try 1-800-JAN-XTAL -- 7777777 3333333 **************************************** 77 33 ** Paul Anderson, AB4VA ** 77 33 ** pander01@harris.com ** 77 33 ** AB4VA @ KT4DI.#MLBFL.FL.USA.NA ** 77 33 33 **************************************** 77 33 From amsoft@epix.net Sun Jul 21 18:53:59 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cableol.net!news-lond.gsl.net!news.gsl.net!news-paris.gsl.net!news.gsl.net!news-dc.gsl.net!news.gsl.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!newsfeed.internetmci.com!nntp.earthlink.net!usenet From: Chris Boone Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help: Building a repeater system Date: Wed, 17 Jul 1996 18:47:46 -0700 Organization: ENTERGY - Texas : Telecommunications Dept Lines: 39 Message-ID: <31ED97C2.21A1@earthlink.net> References: <4sbcg4$s85@newsbf02.news.aol.com> NNTP-Posting-Host: pool054.max6.houston.tx.dynip.alter.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win16; U) KC8DML wrote: > > I was told by someone that you could somehow link two base station or > mobile radios like the Motorola Mocom 70 and it could operate like a > repeater. I am an amatuer radio operator and I am trying to put together a > radio system for my dad's business on high band (148-174). Ahhh Rob..... Repeaters in VHF High band are NOT that easy to get licensed or coordinated in the major metro areas...The channels are crowded and hard to come by nowadays.... If you havent gotten a license for the system, I wouldnt bother looking for gear....you'll have plenty of time for that! (Besides there is plenty of GE MSTR II, etc on the market that works just fine! Rptrs, bases, mobiles converted to rptrs, etc) >I am also > looking for any new or used VHF radio equipment, (handhelds, mobiles, base > stations, pagers(ex. Minitor II), test equipment, and possible ideas on > what kind of antenna system I should use (1/4 wave vertical with ground > radials, ground plane, or just a simple dipole???). Would I need two > seperate antennas??? > > THX de KC8DML > Rob > Chardon, Ohio > 147.21+ 444.65+ > 147.015+ 444.375+ > 146.76- 146.94- > In the Cleveland Area Chris WB5ITT PG-9-5322 Commercial 224.8/444.8 Conroe/Houston, TX WB5ITT 224.5/444.5 Beaumont, TX WB5ITT and various other rptr systems From amsoft@epix.net Sun Jul 21 18:54:00 1996 Path: news2.epix.net!uunet!in2.uu.net!news.leonardo.net!news.vbc.net!samba.rahul.net!rahul.net!a2i!olivea!sgigate.sgi.com!spool.mu.edu!agate!howland.reston.ans.net!nntp.crl.com!usenet From: Dave Booth kc6wfs Newsgroups: rec.radio.scanner,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.dx,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,fidonet.ham,rec.ham-radio,rec.ham-radio.packet,rec.ham-radio.swap,slac.rec.ham_radio,su.org.ham-radio,swb.lists.linux.hams,rec.radio.swap,tnn.radio.amateur,uwarwick.societies.amateur-radio Subject: homepage Date: Tue, 16 Jul 1996 15:41:53 -0700 Organization: KC6WFS Lines: 5 Message-ID: <31EC1AB1.41C6@pactitle.com> NNTP-Posting-Host: 165.113.223.131 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.02 (X11; I; IRIX 5.3 IP19) Xref: news2.epix.net rec.radio.scanner:54216 rec.radio.amateur.antenna:23297 rec.radio.amateur.digital.misc:16523 rec.radio.amateur.dx:131 rec.radio.amateur.equipment:31144 rec.radio.amateur.homebrew:16190 rec.radio.amateur.misc:105345 rec.radio.amateur.policy:35559 rec.radio.amateur.space:7337 fidonet.ham:7 slac.rec.ham_radio:62 su.org.ham-radio:292 swb.lists.linux.hams:13 rec.radio.swap:70403 tnn.radio.amateur:64 uwarwick.societies.amateur-radio:25 If you get boared. Check out my Ham Page. Lots of good links! http://www.geocities.com/Hollywood/5860 -- Dave Booth kc6wfs From amsoft@epix.net Sun Jul 21 18:54:00 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-chi-13.sprintlink.net!newsfeed.internetmci.com!news.flinet.com!news From: billh@flinet.com (Bill Hayhurst) Newsgroups: rec.radio.amateur.homebrew Subject: ICOM R-7000 12 VOLT DC OPERATION Date: Thu, 18 Jul 1996 00:45:20 GMT Organization: Florida Internet Lines: 8 Message-ID: <4sk2mk$gu@news.flinet.com> NNTP-Posting-Host: wpb31.flinet.com X-Newsreader: Forte Free Agent 1.0.82 Does anyone know the wiring of this radio for 12 volts dc? Icom offers a kit for $30.00. Seems like it should be simple. Any help??? Thanks. Bill Hayhurst KE4IDU From amsoft@epix.net Sun Jul 21 18:54:01 1996 Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!van.istar!west.istar!news.jumppoint.com!b08m From: jsm@deepcove.com (Steve McDonald) Newsgroups: rec.radio.amateur.homebrew Subject: Low Frequency Scrapbooks Date: Fri, 19 Jul 96 14:20:50 GMT Organization: deepcove.com Lines: 8 Distribution: world Message-ID: <4so85r$l6s@marine.jumppoint.com> NNTP-Posting-Host: b08m.deepcove.com X-Newsreader: News Xpress Version 1.0 Beta #2 I am trying to locate some of the earlier editions of: THE LOW and MEDIUM FREQUENCY SCRAP BOOKS These are published by KEN CORNELL (W2IMB). I am looking for editions #1 - 8. If you have one and would like to sell it (or lend to me for photocopying), can you please e-m ail me. Many thanks, Steve (VE7SL) From amsoft@epix.net Sun Jul 21 18:54:02 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.sprintlink.net!news-stk-200.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!news.gate.net!nntp.seflin.lib.fl.us!p014971b From: p014971b@pbfreenet.seflin.lib.fl.us (George Butler) Newsgroups: rec.radio.amateur.homebrew Subject: Need Antenna Tuner Date: 16 Jul 1996 21:54:38 GMT Organization: SEFLIN Free-Net - Palm Beach Lines: 11 Message-ID: <4sh32u$epp@nntp.seflin.lib.fl.us> NNTP-Posting-Host: pbfreenet.seflin.lib.fl.us X-Newsreader: TIN [version 1.2 PL2] I am looking for an antenna tuner design. Any suggestions? Please reply directly to the address below. TIA -- George Butler p014971b@pbfreenet.seflin.lib.fl.us From amsoft@epix.net Sun Jul 21 18:54:03 1996 Path: news2.epix.net!uunet!in2.uu.net!wizard.pn.com!news.zeitgeist.net!vnetnews.value.net!dkg From: dkg@value.net (David Genrich) Newsgroups: rec.radio.amateur.homebrew Subject: Need input on HF antenna idea Date: Mon, 15 Jul 96 18:28:16 GMT Organization: Value Net Internetwork Services Inc. Lines: 21 Message-ID: <4se2tc$av@vnetnews.value.net> NNTP-Posting-Host: h232.value.net X-Newsreader: News Xpress 2.0 Beta #0 I am currently looking at a HF unit to add to my shack. The problem is, I am in an apartment, making it diffuclt to put up a low band antenna. However, while out on my pouchh the other day I noticed the rain gutter comes down right at the edge of my pouch (I'm on the ground floor). Anyway, here is my idea: Disconnected the raingutter from the ground, then load the gutter up through a matching transformer. Would this work? I'm also worried about how this RF energy would affect others. What if someone touchs it while transmitting (200 Watts)? I figured that there was atleast 1000 feet of aluminum rain gutter going around the building (very conservitive figure). Thus, with 200 Watts, there souldn't be that much RF at any one point that would harm anyone. Maybe only transmit at night? I'm also conserned on how it will affect other peoples TV and radio reception. So, will this idea work? Any ideas, thoughts, or comments? David Genrich, KF6CZP dkg@value.net From amsoft@epix.net Sun Jul 21 18:54:04 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Power supplies for 4CX250 or 4X150. Message-ID: <1996Jul16.140922.4377@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <85EE722F012E0F00@seitz.com> Date: Tue, 16 Jul 1996 14:09:22 GMT Lines: 47 In article <85EE722F012E0F00@seitz.com> CHRIS@seitz.COM (R Chris Ross) writes: > > I have been collecting parts for an amplifier using a 4X150 on >6 meters. The plate supply is easy but I'm not too sure about the >grids. One supply is about 300 VDC at ~ 50 mA regulated and the >other is at aboth -75 VDC but I don't know the current draw. Is the >300 V supply right and what is the current level on the -75 V supply. 300 volts sounds about right for the screen grid supply, but 50 mA sounds high for screen current. The -75 volt supply is the control grid bias supply. It shouldn't need to supply any current at all to the tube, but it needs to be adjustable so you can set the idling current of the amplifier. -75 volts sounds close to, if not beyond, cutoff for the tube, so you'll want to be able to reduce this bias voltage to set idling current. (I have a suspicion that the circuit you have is for a Class C amp. You probably want a Class AB1 amp instead.) Note that screen supplies aren't simple. It needs to hold regulation with either positive or negative current flow. There may be a shunt resistor in the circuit used for this, and that would explain the 50 mA rating of the supply. And the screen needs to be bypassed well for RF. You also want the control circuits to apply HV before screen voltage, and remove screen voltage before removing HV, or you could destroy the grid as it tries to become the tube plate. (This can be done at the same time if you can ensure that screen voltage will never be present without HV being present.) > One of the things that I was looking at is that it would be >extremely easy for me to design a switching supply for the grid >supplies running off of say 12 VDC. This could lead to later >designing a 12 VDC to ~1500 VDC plate supply for portable operation. >My only problen is not being familiar with the requitements for these >supplies and old designs don't worry about it. Get a copy of Eimac's "The Care and Feeding of Power Grid Tubes" and read up on what you need to do to make these amps live. You can use switching supplies, but be careful to shield and filter them well. If RF gets into them, they can go wild and destroy themselves, or the tube. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Sun Jul 21 18:54:05 1996 Path: news2.epix.net!uunet!in2.uu.net!spool.mu.edu!munnari.OZ.AU!news.mel.connect.com.au!news.uwa.edu.au!disco.iinet.net.au!opera.iinet.net.au!news From: richardh@iinet.net.au (Richard Hosking) Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew,comp.dsp Subject: Qualcomm Q2334 DDS Date: Sat, 20 Jul 1996 05:17:26 GMT Organization: iiNet Technologies Pty Ltd Lines: 14 Message-ID: <4sppmm$ic8@opera.iinet.net.au> Reply-To: richardh@iinet.net.au NNTP-Posting-Host: grunge244.nv.iinet.net.au X-Newsreader: Forte Free Agent 1.0.82 Xref: news2.epix.net sci.electronics.design:10112 rec.radio.amateur.homebrew:16211 comp.dsp:30161 Gday all I have built a board using the Qualcomm Q2334 dual DDS but am having difficulty with the software - so much so that I wonder if I have damaged the chip in some way. Does anyone have pointers to software to drive the chip - are there any special problems? Thanks Richard Hosking VK6BRO richardh@iinet.net.au http://www.iinet.net.au/~richardh From amsoft@epix.net Sun Jul 21 18:54:06 1996 Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news From: A Guy named Moe Newsgroups: rec.radio.amateur.homebrew Subject: Radio Information Date: Fri, 19 Jul 1996 23:54:24 -0700 Organization: ************** Lines: 6 Message-ID: <31F0829F.224F@mailhost.oxford.net> NNTP-Posting-Host: burgessville-157.oxford.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5a (Win16; I) I was just wondering if anyone could tell me in Canada what is the maximum distance and signal stranght that an amatureradio station could broadcast with? thanks From amsoft@epix.net Sun Jul 21 18:54:07 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!nntp.primenet.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail From: stevem@best.com (Stephen Muther) Newsgroups: rec.radio.amateur.homebrew Subject: Re: SB100 Part Needed Date: 16 Jul 1996 16:26:28 -0700 Organization: BEST Internet Communications Lines: 20 Message-ID: <4sh8f4$ff2@shellx.best.com> References: <9605288359.AA835977661@mails.imed.com> <31EC1D2D.7784@iamerica.net> NNTP-Posting-Host: shellx.best.com In article <31EC1D2D.7784@iamerica.net>, Hector A. Gomez wrote: >I was needing a 40 Meter Hetradyne Crystal(15.895MHz) for my Heathkit >SB100. Please let me know if you have one for sale or trade or even if >you just know where I can locate one. > > >Thanks, > >Hector >KC5CXC If no one has one from a trashed SB100, you can copy the oscillator section of the schematic and send it to International Crystal in Oklahoma and they will make you one. Probably cost about $12.00. Good Luck Steve M. WF6R From amsoft@epix.net Sun Jul 21 18:54:08 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news From: A Guy named Moe Newsgroups: rec.radio.amateur.homebrew Subject: Small Radio Date: Sun, 21 Jul 1996 17:44:56 -0700 Organization: ************** Lines: 5 Message-ID: <31F2CF08.79DA@mailhost.oxford.net> NNTP-Posting-Host: burgessville-137.oxford.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5a (Win16; I) I would like to setup a small radio station but I need plans and diagrams to build a fm transmiter thanks From amsoft@epix.net Sun Jul 21 18:54:09 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.inc.net!uwm.edu!news-res.gsl.net!news.gsl.net!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!netnews.worldnet.att.net!newsadm From: Jim Newsgroups: rec.radio.amateur.homebrew Subject: Re: Source of Ferrite Beads? Date: Sun, 21 Jul 1996 10:31:03 +0000 Organization: AT&T WorldNet Services Lines: 19 Message-ID: <31F206E7.2BF5@worldnet.att.net> References: <31F006C4.7BA0@lamar.colostate.edu> NNTP-Posting-Host: 235.atlanta-3.ga.dial-access.att.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win16; I) fiz wrote: > > Hi, > > Can anyone recommend a place to get ferrite beads big enough to slip over > RG-58? They don't need to slip over the BNC connector, only the cable, > 0.2" OD. > > ttfn fiz (KG0YG)Contact AMIDON at (714)850-4660 and ask for their catalog. They carry a large selection of ferrite beads of various sizes and types. Also, try your next local hamfest. CQ and QST have many advertizers that offer what you are looking for or can provide a source that may be close to you. Good luck... DE KC4FWS Jim KC4FWS@worldnet.att.net From amsoft@epix.net Sun Jul 21 18:54:10 1996 Path: news2.epix.net!uunet!inXS.uu.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!news.sprintlink.net!news-pen-14.sprintlink.net!coopnews.coop.net!news.den.mmc.com!NewsWatcher!user From: thomas.g.booth@den.mmc.com (Booth, Thomas G) Newsgroups: rec.radio.amateur.homebrew Subject: Re: very low frequency recievers Followup-To: rec.radio.amateur.homebrew Date: 15 Jul 1996 21:44:24 GMT Organization: A Turbulent One Lines: 49 Distribution: na Message-ID: References: <4sbp84$7hh@synthemesc.insync.net> <4scch2$ci1@newsbf02.news.aol.com> NNTP-Posting-Host: 160.205.101.24 In article <4scch2$ci1@newsbf02.news.aol.com>, lrware@aol.com (Lrware) wrote: > Depending on your location WWVB can be a real pain. > I live in Orlando, Florida (very high local noise level) > and bought a commerical unit surplus after > several trys at building a working unit. > The good news is I just read where NIST is going to turn up > the transmitted power at WWVB next year. If I remember > correctly they plan to triple it. > Check out "73 Amateur Radio Today" > Jan, Feb & Mar 1994 issues for a design by > Bob Roehrig (K9EUI). > Also look at the Aug. 1973 issue of "Radio Electronics." > for some design data from Don Lancaster. > -Larry Here's a couple of comments to complement Larry's posting: 1) I have built Bob Roehrig's WWVB active antenna, receiver and frequency comparator, and they work just fine. Unlike Larry, I happen to be blessed (?) w/ being approx. 65 mi. from the WWVB transmitter site; I had to really reduce the receiver gain to comply w/ Bob R.'s alignment criteria. I guess I'll have to reduce the receiver gain further when the ERP of WWVB is increased... 2) Beware of local noise sources (esp. light dimmers) whilst receiving WWVB. During my initial bench test on the active antenna and receiver, just one activated dimmer in my house produced enough interference to render the received WWVB signal useless. 3) Don Lancaster's WWVB article in the August 1973 issue of Radio-Electronics (and the concluding article in the September 1973 issue) IMO provides an alternative WWVB receiver approach, but the designs presented may require some revision due to obsolete/unobtainable parts. Note also that Lancaster's articles were oriented towards reception of the WWVB serial time code vs. Roehrig's emphasis on frequency comparison (though both authors discuss ways to get both frequency and time code from their projects). 4) Another source of information (if you can find a copy) is the October 1964 issue of Hewlett Packard Journal. This issue has an article which discusses the venerable HP 117A VLF Comparator, which AFAIK was one of the first instruments designed to provide a relatively quick means of NBS/NIST-traceable frequency comparison via WWVB. TGB \\ The opinions expressed herein are my own. // From amsoft@epix.net Sun Jul 21 18:54:11 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!howland.reston.ans.net!nntp.coast.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!insync!news From: firewevr@insync.net (erikc) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Want to build stereo amp- where to start? Date: Wed, 17 Jul 1996 21:56:51 GMT Organization: bugshit.nutso.com Lines: 35 Message-ID: <4sjnau$dfo@synthemesc.insync.net> References: <4sh162$rtb@agate.berkeley.edu> NNTP-Posting-Host: dialup-164-100.insync.net X-Newsreader: Forte Free Agent 1.0.82 bigdick@uclink3.berkeley.edu (Bigdick McGee) wrote: +-> I would like to build my own 80-150 watt per channel amplifier fro my +-> home audio system. I just don't know where to start. Can anyone +-> recommend a good reference for starting such a project? Something that +-> will really lead me along with a project that I can improve myself. +-> Thanks, Jed My recommendation would be to go to the rec.audio.* groups. They will be far more helpful to you there. Erikc +-> -- +-> ****************************************************************************** +-> Hey Der, Polka Boy, Go Home and Suck a Beer * Go Bears! +-> Hey Der, Bratwurst Head, Go Drive Your Old John Deere * (both of 'em) +-> Yah Hey, Keep Your Women Away, The Smell Will Make Us Cry * Anything critical said of me by a religious zealot only further convinces me that I am on the right path to truth, inner peace, enlightenment, and other such delights. -- Me From amsoft@epix.net Sat Jul 27 19:18:45 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tank.news.pipex.net!pipex!nntp.primenet.com!news.cais.net!mr.net!winternet.com!n1ott.istar!ott.istar!istar.net!tor.istar!east.istar!news From: A Guy named Moe Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.equipment Subject: Packet Modems Date: Thu, 25 Jul 1996 14:06:40 -0700 Organization: ************** Lines: 2 Message-ID: <31F7E1E0.23E4@mailhost.oxford.net> NNTP-Posting-Host: burgessville-122.oxford.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5a (Win16; I) Xref: news2.epix.net rec.radio.amateur.homebrew:16252 rec.radio.amateur.antenna:23399 rec.radio.amateur.equipment:31314 Does anyone know how they work and were to get inforation on the net. I can not go to a local book store because there is not one near by. From amsoft@epix.net Sat Jul 27 19:18:46 1996 Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news From: A Guy named Moe Newsgroups: rec.radio.amateur.homebrew Subject: TV station Date: Sun, 21 Jul 1996 17:46:04 -0700 Organization: ************** Lines: 3 Message-ID: <31F2CF4B.79E@mailhost.oxford.net> NNTP-Posting-Host: burgessville-137.oxford.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5a (Win16; I) I was thinking of seting up a TV station using a video camera microphone and VCR. anyone know where to get plans to build a transmiter and information on a antanna? From amsoft@epix.net Sat Jul 27 19:18:46 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!in2.uu.net!psinntp!psinntp!psinntp!psinntp!usenet From: art2@usa.pipeline.com(Art) Newsgroups: rec.radio.amateur.homebrew Subject: SPELLING PLEASE Date: 25 Jul 1996 22:02:59 GMT Organization: Pipeline Lines: 4 Message-ID: <4t8quj$k9f@news2.h1.usa.pipeline.com> NNTP-Posting-Host: 38.8.120.9 X-PipeUser: art2 X-PipeHub: usa.pipeline.com X-PipeGCOS: (Art) X-Newsreader: Pipeline v3.5.0 For the life of me I can't understand why full fledged hams insist on spelling "reciever" instead of "RECEIVER". 73's de Art From amsoft@epix.net Sat Jul 27 19:18:47 1996 Path: news2.epix.net!uunet!in2.uu.net!ott.istar!istar.net!tor.istar!east.istar!news From: A Guy named Moe Newsgroups: rec.radio.amateur.homebrew Subject: Scanners & Short wave equipment Date: Sun, 21 Jul 1996 17:47:53 -0700 Organization: ************** Lines: 5 Message-ID: <31F2CFB9.2957@mailhost.oxford.net> NNTP-Posting-Host: burgessville-137.oxford.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5a (Win16; I) I was wondering if anyone knows were to get plans to build short wave equipment and scanners and the antannas thanks From amsoft@epix.net Sat Jul 27 19:18:48 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-chi-13.sprintlink.net!nntp.primenet.com!news.cais.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!swrinde!cs.utexas.edu!howland.reston.ans.net!nntp.crl.com!usenet From: farside@io-online.com (John) Newsgroups: rec.radio.amateur.homebrew Subject: helical resonators Date: Sun, 21 Jul 1996 22:40:38 GMT Organization: CRL Dialup Internet Access Lines: 6 Message-ID: <31f2b190.0@news.io-online.com> NNTP-Posting-Host: 206.245.244.7 X-Newsreader: Forte Free Agent 1.0.82 I am looking for some plans on how to build a 2-meter helical resonator (band pass). John KE6ZUZ From amsoft@epix.net Sat Jul 27 19:18:49 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!worldlinx.com!clio.trends.ca!winternet.com!mr.net!visi.com!news From: Bob Liesenfeld Newsgroups: rec.radio.amateur.homebrew Subject: Heath GR-78 Date: Sun, 21 Jul 1996 22:29:13 +0600 Organization: none Lines: 6 Message-ID: <31F25AD9.26D8@visi.com> NNTP-Posting-Host: 192-45.dynamic.visi.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win16; I) Hi, I'm looking for a schematic/manual for a Heathkit GR-78 receiver. I'll pay costs etc. Thank you! Bob L. wb0poq@visi.com From amsoft@epix.net Sat Jul 27 19:18:49 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!hsno.wco.com!news.wco.com!news From: kaf3@axe.humboldt.edu (Kay Fule) Newsgroups: rec.radio.amateur.homebrew Subject: TV-Radio Date: Sun, 21 Jul 1996 19:21:19 GMT Organization: West Coast Online's News Server - Not responsible for content Lines: 6 Message-ID: <31f282f5.826665392@199.4.94.14> NNTP-Posting-Host: ts03.tidepool.com X-Newsreader: Forte Agent .99d/32.182 I heard it was possible to make a ham radio out of a Tv. Anyone here know how? Thanks kaf3@axe.humboldt.edu From amsoft@epix.net Sat Jul 27 19:18:50 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cableol.net!news-lond.gsl.net!news.gsl.net!tank.news.pipex.net!pipex!iol!usenet From: gerrad madden Newsgroups: rec.radio.amateur.homebrew Subject: 2meter 250-1kw urgently wanted Date: 23 Jul 1996 14:34:10 GMT Organization: Ireland On-Line Lines: 7 Message-ID: <4t2nt2$2n5@nuacht.iol.ie> NNTP-Posting-Host: dialup-003.limerick.iol.ie 2meter 250-1kw amplifer wanted urgently. Homebrew will be considered. Mail to Tony radiol@iol.ie From amsoft@epix.net Sat Jul 27 19:18:51 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!portal.gmu.edu!newsfeed.internetmci.com!psgrain!rainrgnews0!news.cenornet.com!usenet From: Tate Gordinier Newsgroups: rec.radio.amateur.homebrew Subject: CB radio crystal modification Date: Mon, 22 Jul 1996 16:03:19 -0700 Organization: CenORneT Access Services Lines: 8 Message-ID: <31F408B7.55BF@cenornet.com> NNTP-Posting-Host: ppp1.cenornet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win95; U) I have been going crazy trying to find any way to add or change frequencies in a Uniden Pro 510xl, if that is possible. Is it possible to do this by just using different crystals, or would using a different crystal mess up the PLL chip? (The PLL is a sm5124.) Thanks in advance for any help. Tate jibeaux@cenornet.com From amsoft@epix.net Sat Jul 27 19:18:52 1996 Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.cetlink.net!usenet From: "vigilant" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Antenna for 2 Meters Date: Sat, 20 Jul 1996 18:01:56 -0400 Organization: MJS Enterprises Lines: 9 Message-ID: <01bb7687.4b21f600$d3681fce@mjs-enterprises> References: <4soucp$2o5@news-e2b.gnn.com> <4srcfl$6fi@hera.ia.net> NNTP-Posting-Host: rhsc-211.cetlink.net X-Newsreader: Microsoft Internet News 4.70.1085 take an so-239 and make a 2m groundplane antenna......get it up as high as you can and feed it with the lowes loss coax you have.....you should able to hit paket stations...... > > I have quite a bit of experience with building HF antennas but zero > > experience with VHF. Anyone have any suggestions? > > Thanks > > Dave LeDuc K1EPJ From amsoft@epix.net Sat Jul 27 19:18:52 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!insync!news From: firewevr@insync.net (erikc) Newsgroups: rec.radio.amateur.homebrew Subject: Helical Filters Date: Thu, 25 Jul 1996 16:44:16 GMT Organization: bugshit.nutso.com Lines: 9 Message-ID: <4t880n$9ii@synthemesc.insync.net> NNTP-Posting-Host: dialup-164-161.insync.net X-Newsreader: Forte Free Agent 1.0.82 Can anybody out there explain to me what a "helical filter" is and how it works. This is a new one on me. Thanks. Erikc Religious fundamentalists are a plague sent by God to punish us for our joys. -- me From amsoft@epix.net Sat Jul 27 19:18:53 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.dgsys.com!en.com!in-news.erinet.com!ddsw1!news.mcs.net!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!cs.utexas.edu!math.ohio-state.edu!uwm.edu!spool.mu.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!cdc2.cdc.net!news.texas.net!news.kei.com!newsfeed.internetmci.com!tir.com!news From: n8tt@tir.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: QRP 3-Bander from 10/89 QST Date: 27 Jul 1996 14:50:06 GMT Organization: The Internet Ramp Lines: 9 Message-ID: <4tdaau$fs0@ramp2.tir.com> References: <31F6A782.1BAC@elec.ctl.etn.com> NNTP-Posting-Host: an194.tir.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) I second the idea of building the Sierra! It does require some experience to build. The result is a radio that works and has the few features one needs - small, multi-band, RIT when you want it, good bandpass filter, ..... I added the frequency counter/keyer kit - it works very well. Enjoy. N8TT From amsoft@epix.net Sat Jul 27 19:18:54 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!hunter.premier.net!netnews.worldnet.att.net!arclight.uoregon.edu!enews.sgi.com!wdl1.wdl.lmco.com!enterprise!pax!jeffa From: jeffa@pax.ssd.loral.com Subject: Re: Prototyping boards for SMD? Message-ID: <1996Jul24.190643.9105@ssd.loral.com> Sender: (null)@(null) ((null)) Organization: Space Systems Loral References: <838157284snz@lfheller.demon.co.uk> Date: Wed, 24 Jul 1996 19:06:43 GMT Lines: 11 If you have an old HP style pen plotter and a CAD or drawing package that can output to it, you can use a special ink pen (forget the part number; I have it at home) to draw a single sided board for mounting the SMD parts. I've gotten as good as .015" C-C spacing without ink bridging. Pullout your Radio Shack speci al FeCl etchant, Ammonium persulfate solution, or even old sulfuric acid and etch the board. For QFP's and other small C-C parts (or large pin count parts), it' s real nice to pre-tin the board. I suggest using the various Stannous Chloride electroless flash solutions that are available (I remember G.C. (sic?) from Canada makes one; ~1 qt. for ~$10 several years ago). After tinning, flux the board. I use X-32 low residue flux; not rosin based fluxes. Use a small iron (such as a Oryx) and small diameter solder (flux core) on each pin. From amsoft@epix.net Sat Jul 27 19:18:55 1996 Path: news2.epix.net!uunet!in2.uu.net!hunter.premier.net!newsfeed.internetmci.com!howland.reston.ans.net!swrinde!sdd.hp.com!col.hp.com!jms From: jms@col.hp.com (Mike Stansberry) Newsgroups: rec.radio.amateur.homebrew Subject: Re: SPELLING PLEASE Date: 26 Jul 1996 13:28:28 GMT Organization: HP Colorado Springs Division Lines: 11 Message-ID: <4tah5s$7oe@nonews.col.hp.com> References: <4t8quj$k9f@news2.h1.usa.pipeline.com> NNTP-Posting-Host: mssjms.col.hp.com X-Newsreader: TIN [version 1.2 PL2] Art (art2@usa.pipeline.com) wrote: : For the life of me I can't understand why full fledged : hams insist on spelling "reciever" instead of "RECEIVER". : : 73's de Art I'm with you, Art. But may I point out that '73' means 'best regards' That make the above 'best regards's' 73, de Mike From amsoft@epix.net Sat Jul 27 19:18:56 1996 Path: news2.epix.net!uunet!inXS.uu.net!news.PBI.net!usenet From: peabody@pacbell.net (Gus Peabody) Newsgroups: rec.radio.amateur.homebrew Subject: Wanted: Schematic for Heath GR-81 Regen SW recvr Date: 21 Jul 1996 18:30:02 GMT Organization: Sport Sushi Co Lines: 12 Message-ID: <4stsva$581@news.snfc21.pacbell.net> NNTP-Posting-Host: ppp-3-30.okld03.pacbell.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 I picked up this Heathkit shortwave regenerative receiver GR-81 and I'd like to restore it to working condition. It has a few parts that look like they were added on after it was built. It is also missing two tubes and there is no marking on the chassis to indicate their identity. Be glad to pay for copying and shipping if any one has documentation on this device, or if there is an archive site of Heathkit schematics, I'd appreciate that Info as well. Thanx...Gus From amsoft@epix.net Sat Jul 27 19:18:57 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.kei.com!news.texas.net!newsfeed.concentric.net!news2.acs.oakland.edu!jobone!fiesta.srl.ford.com!pt9201.ped.pto.ford.com!usenet From: Jeff King Newsgroups: rec.radio.amateur.homebrew Subject: Re: How to detect WHICH PL tone receiving? Date: Mon, 22 Jul 1996 16:34:13 -0700 Organization: Ford Motor Co., Powertrain Electronics Lines: 12 Message-ID: <31F40FF5.2BAC@mich.com> References: NNTP-Posting-Host: itc478.ccd.ford.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win16; I) David Feldman wrote: > So the question is: are there any published circuits (chip or circuit > level) that would output a digital word (5-6 bits?) based on which PL > tone is in the received signal at a given instant in time? > > 73 Dave WB0GAZ dgf@netcom.com Check out MX-COM. They make a number of CTCSS decoders, one of which I'm sure could be adapted to your needs. -Jeff WB8WKA From amsoft@epix.net Sat Jul 27 19:18:58 1996 Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newsstand.cit.cornell.edu!news.acsu.buffalo.edu!news.drenet.dnd.ca!crc-news.doc.ca!nott!standby.nrc.ca!NewsWatcher!user From: peter.orban@nrc.ca (Peter Orban) Newsgroups: rec.radio.amateur.homebrew Subject: 455KHz 500Hz CW filter Date: Fri, 26 Jul 1996 08:53:28 -0400 Organization: NRC Lines: 12 Message-ID: NNTP-Posting-Host: 132.246.72.31 A friend of mine is looking for the above filter for a Kenwood TS 450S AT ham radio. Are these filters expensive? (I have not received any quotes from supplyers yet.) How are such filters implemented, are those quartz, ceramic or mechanical filters? Any chance to homebrew one? Any comments welcomed! Thanks, Peter -- Peter Orban National Research Council of Canada peter.orban@nrc.ca From amsoft@epix.net Sat Jul 27 19:18:59 1996 Path: news2.epix.net!uunet!inXS.uu.net!ott.istar!istar.net!tor.istar!east.istar!news From: Douglas Berry Newsgroups: sci.electronics.repair,rec.radio.amateur.homebrew Subject: Remote Door Lock Transmitter for GM Car Date: 22 Jul 1996 16:42:09 GMT Organization: iSTAR internet Incorporated Lines: 13 Message-ID: <4t0b11$fki@nr1.toronto.istar.net> NNTP-Posting-Host: 207.81.101.91 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) Xref: news2.epix.net sci.electronics.repair:29974 rec.radio.amateur.homebrew:16239 I have a remote door lock transmitter for a Oldsmobile Royale that is not unlocking the doors. I'am trying to determine if it is the transmitter or the reciever in the car. My question is, does anyone no the frequencies that GM use in there remote transmitters. Using the Scope I tested the crystal and found that it is oscillating. Any help would be appreciated. Thanks Douglas Berry Email: dberry@wcl.on.ca Packet: VA3DMB@VE3IJD.#CON.ON.CAN.NOAM From amsoft@epix.net Sat Jul 27 19:18:59 1996 Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!swrinde!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!bt!usenet From: Paul Beastall Newsgroups: rec.radio.amateur.homebrew Subject: High voltage transformers Date: 25 Jul 1996 15:29:55 GMT Organization: BT Labs Lines: 13 Message-ID: <4t83tj$n0r@pheidippides.axion.bt.co.uk> NNTP-Posting-Host: pc1.garden.bt.co.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) I'm trying to find a transformer suitable for a pair of 3cx800a7 triodes and in the UK I would have to have one made as a special. I understand that in the States there may be some off the shelf options (Peter Dahl or Avatar Magnetics?). Does anyone have any details or can they point me in the right direction? Thanks Paul Beastall, G1WBZ Ipswich, UK. From amsoft@epix.net Sat Jul 27 19:19:00 1996 Path: news2.epix.net!uunet!in2.uu.net!cs.utexas.edu!newshost.convex.com!cnn.exu.ericsson.se!erinews.ericsson.se!usenet From: Christer.Jogenborn@era.ericsson.se Newsgroups: rec.radio.amateur.homebrew Subject: 144Mhz 4cx250 PA Date: 22 Jul 1996 11:25:50 GMT Organization: Mobile Telephone Systems PDC Lines: 14 Message-ID: <4svofu$hg@erinews.ericsson.se> Reply-To: Christer.Jogenborn@era.ericsson.se NNTP-Posting-Host: kicc16.eraj.ericsson.se I am looking for articles on 144MHz final amplifiers, that is - more or less complete features on projects to complete a PA, I am short of descriptions of the RF bits. The choice is a pair of 4cx250 (B?) for SSB use or a 4cx350. Anyone with some good references in ham magazines recently (or ancient ?) Chris sm0ncl -- From amsoft@epix.net Sat Jul 27 19:19:01 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.comm.net!imci5!pull-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: k5qq@aol.com (K5QQ) Newsgroups: rec.radio.amateur.homebrew Subject: Re: ICOM R-7000 12 VOLT DC OPERATION Date: 23 Jul 1996 08:45:47 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 14 Sender: root@newsbf02.news.aol.com Message-ID: <4t2hhr$54g@newsbf02.news.aol.com> References: <4sk2mk$gu@news.flinet.com> Reply-To: k5qq@aol.com (K5QQ) NNTP-Posting-Host: newsbf02.mail.aol.com Hi Bill I have the cable and I think that is all ICOM is selling you for the $30. To run it on 12 VDC, you remove the "jumper" plug out of the back and plug the 12 VDC in there. I think the pin at the top of the triangle is the +12 in and the bottom is the ground. When the set runs off of 110 volts, the power supply inside puts 12 volts on the 2nd pin and the jumper takes it up to the top pin. Works great in my car, I just hate to take that much radio for a ride just sitting on the seat!! Jim K5QQ@AOL.COM From amsoft@epix.net Sat Jul 27 19:19:02 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.nevada.edu!news.tamu.edu!bcm.tmc.edu!pendragon!ames!elroy.jpl.nasa.gov!news.msfc.nasa.gov!newsfeed.internetmci.com!cdc2.cdc.net!vixen.cso.uiuc.edu!usenet From: Carl Gregory Newsgroups: rec.radio.amateur.homebrew Subject: Re: schematics of a transverter 28 Mhz <-> 50 Mhz wanted Date: Tue, 23 Jul 1996 11:34:08 -0500 Organization: University of Illinois at Urbana Lines: 14 Message-ID: <31F4FF00.6301@uiuc.edu> References: <4t2i3s$1e0@news.NL.net> NNTP-Posting-Host: mapper.beckman.uiuc.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Macintosh; I; PPC) To: erwin cremers erwin cremers wrote: > > Hello, > > I'm looking for schematics to build a transverter 28 Mhz <-> 50 Mhz. > > If you have any information please let me know, Ten-Tec sells such a converter kit. I bought one at Dayton for about $10 US. It's just a 4cm square PCB - no case or connectors - so it can easily be mounted inside the 28MHz IF radio. 73! Carl, K8CG From amsoft@epix.net Sat Jul 27 19:19:03 1996 Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: mack@mails.imed.COM Newsgroups: rec.radio.amateur.homebrew Subject: Re:Regency RTE202 Date: 22 Jul 96 14:26:03 GMT Organization: ucsd usenet gateway Lines: 15 Message-ID: <9606228380.AA838049790@mails.imed.com> NNTP-Posting-Host: mail.ucsd.edu Originator: daemon@ucsd.edu Don asked about modifying this radio to 900 MHz. If it is the same model of business band radio that I have several of, it will be a difficult task if you keep the duplexor. I basically cannibalized one of them to see what makes it tick. It has a lot of nice parts that could be used to make a 900 MHz radio, though. The best part is that I have a *complete* service manual for whatever model it is I have. The manual and radios are at home right now. I'll try to look tonight. Ray Mack WD5IFS mack@mails.imed.com Friendswood (Houston), TX From amsoft@epix.net Sat Jul 27 19:19:04 1996 Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!newshub.csu.net!newsserver.sdsc.edu!usenet From: teazes@gat.com (Stewart Teaze) Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew Subject: Re: Z8530 SCC Date: 23 Jul 1996 16:38:57 GMT Organization: ASI Lines: 15 Message-ID: <4t2v71$8c9@rosebud.sdsc.edu> References: <31F44B75.72AD3666@craft.camp.clarkson.edu> NNTP-Posting-Host: 141.248.174.218 X-Newsreader: WinVN 0.92.1 Xref: news2.epix.net rec.radio.amateur.digital.misc:16585 rec.radio.amateur.homebrew:16247 In article <31F44B75.72AD3666@craft.camp.clarkson.edu>, John Clark says: > >Does anyone know where I can purchase one of these ICs? I can't seem to >find it from anywhere I normally order from.... (Either the Zilog or >AMD version is fine...) Thanks. > >- John My Newark catalog has Z8530 family parts. It appears you are from Clarkson College, which seems to be in Potsdam, NY(the sticks). They have a Syracuse,NY branch at (315)457-4873. If this is not close to you, you can call information for any moderately-sized city, and get the Newark branch telephone number. From amsoft@epix.net Sat Jul 27 19:19:04 1996 Path: news2.epix.net!uunet!in2.uu.net!cs.utexas.edu!howland.reston.ans.net!EU.net!sun4nl!usenet From: erwin.cremers@ingram.nl (erwin cremers) Newsgroups: rec.radio.amateur.homebrew Subject: schematics of a transverter 28 Mhz <-> 50 Mhz wanted Date: Tue, 23 Jul 1996 14:06:49 GMT Organization: NLnet Lines: 16 Message-ID: <4t2i3s$1e0@news.NL.net> NNTP-Posting-Host: utr99-178.utrecht.nl.net X-Newsreader: Forte Free Agent 1.0.82 Hello, I'm looking for schematics to build a transverter 28 Mhz <-> 50 Mhz. If you have any information please let me know, Greetings 73's ///////////\\\\\\\\\\ Erwin Cremers Dutch Radio Operator PE1MGR \\\\\\\\\\\/////////// From amsoft@epix.net Sat Jul 27 19:19:05 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.mathworks.com!newsfeed.internetmci.com!in3.uu.net!news.interlog.com!news From: James Brooks Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.equipment,sci.electronics.repair,sci.electronics.equipment,sci.electronics.design,sci.electronics.misc Subject: Re: High and low Frequence Antannas Date: Sat, 27 Jul 1996 13:19:22 -0700 Organization: Drastic Technologies Lines: 16 Message-ID: <31FA79CA.955@interlog.com> References: <31F72D1D.17D@mailhost.oxford.net> <4tar39$ec@viking.mpr.ca> NNTP-Posting-Host: jbrooks.interlog.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win95; I; 16bit) Xref: news2.epix.net rec.radio.amateur.homebrew:16266 rec.radio.amateur.antenna:23426 rec.radio.amateur.equipment:31354 sci.electronics.repair:30093 sci.electronics.equipment:4236 sci.electronics.design:10293 sci.electronics.misc:8151 Bob Wilson wrote: > >> A Guy named Moe (skubik@mailhost.oxford.net) wrote: >> : Where can i get information on different types of antannas, how to >>build >> : them and how they work? > > Try the ARRL Handbook. > > Bob. He really should learn to use a search engine. Patrick Rea From amsoft@epix.net Sat Jul 27 19:19:06 1996 Path: news2.epix.net!uunet!in2.uu.net!cdc2.cdc.net!news.texas.net!news.kei.com!uhog.mit.edu!news.mtholyoke.edu!nntp.et.byu.edu!news.byu.edu!news From: richardc@et.byu.edu (Richard Christensen) Newsgroups: rec.radio.amateur.homebrew Subject: PCB resources Date: 25 Jul 1996 20:52:18 GMT Organization: Brigham Young University, Provo UT USA Lines: 17 Distribution: world Message-ID: <4t8mq2$11s@jan.et.byu.edu> NNTP-Posting-Host: spock.et.byu.edu X-Newsreader: Tin 1.1 PL5 I am interested in making some projects for myself. Does anyone have knowledge of what is available in the way of cheap tools, ie: simulators, routers, placers, schematic capture, and pcb makers. One project I want to do will require a lot of drilling, so I really don't want to do this board myself at home. -- /\ /\ . /\____ _-_ / \ _/\ / \ /\ / \ /\ / \ / \ / \ /\/ \ / \_/\_/ Y \ /\/\/ \ u \/ \___/ \/ \ / \/ \ ----------------------------------v-------------------------------- Richard Christensen KC7JPQ richardc@spock.et.byu.edu Go Cougars!! Beat Utah!!! From amsoft@epix.net Sat Jul 27 19:19:07 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!news-fw-12.sprintlink.net!news.inc.net!newspump.sol.net!newsfeeder.sdsu.edu!newshub.sdsu.edu!news2.cais.net!news.cais.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!swrinde!elroy.jpl.nasa.gov!decwrl!pa.dec.com!depot.mro.dec.com!mrnews.mro.dec.com!asic.enet.dec.com!randolph From: randolph@asic.enet.dec.com (Tom Randolph) Newsgroups: rec.radio.amateur.homebrew Subject: Re: *NEED HELP TO REBIAS LO VHF MICOR Date: 22 JUL 96 12:17:21 Organization: Digital Equipment Corporation Lines: 18 Message-ID: <4t0a6p$apt@mrnews.mro.dec.com> References: <4sreqq$11f@mtinsc01-mgt.ops.worldnet.att.net> NNTP-Posting-Host: bootnd.enet.dec.com In article <4sreqq$11f@mtinsc01-mgt.ops.worldnet.att.net>, K4PI@WORLDNET.ATT.N ET writes... >I WANT TO REBIAS A LOW VHF MOTOROLA MICOR , 50MHZ, FROM C TO AB1. >ANYONE DONE THAT? PLAN TO BYPASS PREAMP SECTION AND DRIVE FINALS >DIRECTLY AS HAVE 10 WATT DRIVE ALREADY. 73 MIKE Haven't done it, but I've always thought it might make a good, cheap way to build a 100W linear for HF QRP rigs. 0.7V forward bias from a silicon rectifier applied to the bases of the final transistors, and a little feedback from collector to base to stabilize and to flatten the gain across the HF spectrum would probably do it. It might require adding a cap here and there if the transformer windings would short your bias to ground. Good luck, let us know if you succeed! ============================================================================== Tom Randolph N1OOQ NE-QRP 419 QRP-L 87 ARRL randolph@asic.enet.dec.com ============================================================================== From amsoft@epix.net Sat Jul 27 19:19:08 1996 Path: news2.epix.net!uunet!in2.uu.net!news.inc.net!newspump.sol.net!spool.mu.edu!howland.reston.ans.net!EU.net!chsun!news.eunet.ch!ascomax.hasler.ascom.ch!usenet From: Robert Ganter Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: Digital Microwave Radio Date: Mon, 22 Jul 1996 10:22:20 +0200 Organization: Ascom Business Systems AG Lines: 19 Message-ID: <31F33A3C.78E@ens.ascom.ch> References: <4smur8$8r4@agate.berkeley.edu> <4snmlr$1kn4@mule2.mindspring.com> NNTP-Posting-Host: pcts72.ens.ascom.ch Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.02 (Win16; I) Xref: news2.epix.net rec.radio.amateur.homebrew:16226 rec.radio.amateur.digital.misc:16567 Bob Merritt wrote: > > nickkral@america.CS.Berkeley.EDU (Nick Kralevich) wrote: > > >Does anyone know of a design for a digital microwave transmitter/receiver > >combo that is available on the internet or in book form? Or > >perhaps I'm going about this in the wrong direction... > > Go to the nearest ham radio store and buy a copy of the ARRL Handbook > for Radio Amateurs and then read up on the 10Ghz Gunnplexor/2MBPS > project....Oops, wait a moment, this article is not any more in the ARRL Han dbook anymore! It can be found in another book published by the ARRL. Can't tell You which at the moment, because I have the books at home. Maybe somebody else can help here? Or try http://www.arrl.org Regards Robert (HB9NBY) From amsoft@epix.net Sat Jul 27 19:19:09 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.zeitgeist.net!news.sfo.com!news.cais.net!van-bc!unixg.ubc.ca!info.ucla.edu!psgrain!qiclab.scn.rain.com!toledotel.com!rainrgnews0!news.cenornet.com!usenet From: Tate Gordinier Newsgroups: rec.radio.amateur.homebrew Subject: Re: Video Transmiter Date: Mon, 22 Jul 1996 16:21:19 -0700 Organization: CenORneT Access Services Lines: 21 Message-ID: <31F40CEF.3872@cenornet.com> References: <31EF4F25.48@mailhost.oxford.net> NNTP-Posting-Host: ppp1.cenornet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win95; U) To: A Guy named Moe A Guy named Moe wrote: > > Does anyone know or have plans to build a Video transmiter??? > > thanks There is a two-part article starting in the July 1994 issue of Electronics Now magazine, you could probably find it at most public libraries. The article has schematics, parts lists, building and adjusting instructions, and circut board layout plans for several different transmitters and a reciever. There are plans for a 5-watt 3 channel audio/video transmitter, a 3/4 watt audio video transmitter, a 3/4 watt video only transmitter, and a reciever that will go directly to a TV. The article also gives a company that sells kits. I am in the process of building a 3/4 watt transmitter from the plans and have had some problems finding a few transistors, but most of the parts are readily available through mail order catalogs. I hope any of this is helpfull Tate jibeaux@cenornet.com From amsoft@epix.net Sat Jul 27 19:19:10 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newsstand.cit.cornell.edu!intac!hobbs!cono From: cono@hobbs.com (CONO) Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew Subject: FS: Yeasu FT-757GX CAT HF RIG Message-ID: <8C50377.00280021AC.uuout@hobbs.com> Date: Tue, 23 Jul 96 14:47:00 -0400 Distribution: world Organization: _T_H_E__R_O_Y__H_O_B_B_S__BBS Moonachie NJ 201-641-7307 Reply-To: cono@hobbs.com (CONO) X-Newsreader: PCBoard Version 15.22 X-Mailer: PCBoard/UUOUT Version 1.20 Lines: 21 Xref: news2.epix.net rec.radio.swap:70630 rec.radio.amateur.homebrew:16238 I have forsale a Yeaseu FT-757GX Cat HF Radio and External Antenna Tuner, Heav y duty power supply in MINT Condition! 1000.00 OBO call 201-440-6566 FT-40/41 440 HT forsale, has Quick Charger (NC-50) and exter 5 watt Battery. $275.00 for the radio $75.00 for the quick charger. $30.00 for the FNB41 5 wat t battery. I would consider a trades for: A Kenwood TS-940AT in Good working order. A Yeasu FT1000 in Good working order. CALL 201-440-6566 cono@hobbs.com ......oooooOOOOOo http://www.intac.com/~cono ___,-----.----+_________#_ The Roy Hobbs BBS cono@hobbs.com |________| |__|___________} Node 1: 201-641-7307 ooooo oo ~ ooO-O-O-O == oo\ Node 2: 201-641-3126 From amsoft@epix.net Sat Jul 27 19:19:11 1996 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!netnews.worldnet.att.net!ix.netcom.com!netcom.com!mzenier From: mzenier@netcom.com (Mark Zenier) Subject: Re: Digital Microwave Radio Message-ID: Followup-To: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: <4smur8$8r4@agate.berkeley.edu> <31EF9777.5E64@expert.cc.purdue.edu> <4sosqb$n69@rosebud.sdsc.edu> <4sq1c9$839@gorgor.pa.tetherless.com> <31F5515C.2CD0@rrgroup.com> Date: Thu, 25 Jul 1996 17:27:33 GMT Lines: 21 Sender: mzenier@netcom3.netcom.com Xref: news2.epix.net rec.radio.amateur.homebrew:16259 rec.radio.amateur.digital.misc:16599 in <31F5515C.2CD0@rrgroup.com>, Will Flor wrote: : Definitely true; however, the original poster was discussing : homebrewing components, which is incompatible with legal : operation under Part 15 (unless you're willing to fork over : Big Buck$$ to have your homebrew design type-certified by the : FCC.) Wrong. There's a hobby exclusion in part 15. (At least as of the October 1991 copy I have on my desk.) "15.23 Home-built devices. (a) Equipment authorization is not required for devices that are not marketed, are not constructed from a kit, and are built in quantities of five or less for personal use." ... And subparagraph b is about using "good engineering practice" where the home builder is not able to test for full compliance. Mark Zenier mzenier@eskimo.com mzenier@netcom.com From amsoft@epix.net Sat Jul 27 19:19:12 1996 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!info.ucla.edu!nnrp.info.ucla.edu!zephyr!hansen From: hansen@ee.ucla.edu (Christopher J Hansen) Subject: Re: Digital Microwave Radio Sender: news@seas.ucla.edu (News Daemon) Message-ID: Date: Wed, 24 Jul 1996 19:40:14 GMT X-Nntp-Posting-Host: dantzig.ee.ucla.edu References: <4smur8$8r4@agate.berkeley.edu> <31EF9777.5E64@expert.cc.purdue.edu> <4sosqb$n69@rosebud.sdsc.edu> <4sq1c9$839@gorgor.pa.tetherless.com> <31F5515C.2CD0@rrgroup.com> Organization: ucla X-Newsreader: TIN [version 1.2 PL2] Followup-To: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Lines: 22 Xref: news2.epix.net rec.radio.amateur.homebrew:16256 rec.radio.amateur.digital.misc:16597 Will Flor (willf@rrgroup.com) wrote: : Definitely true; however, the original poster was discussing : homebrewing components, which is incompatible with legal : operation under Part 15 (unless you're willing to fork over : Big Buck$$ to have your homebrew design type-certified by the : FCC.) : 73 de KB9JTT This is true. Home-brewing a device to operate under Part 15 is not practical. Amateur radio is really the only practical way to home brew any type of radio transmitter, except extremely low power. If the application is illegal under the amateur radio rules then give up and find something else to do. There are many things in this world to experiment with. It's a bad idea to get fixated on one application (except, of course, VHF contesting) unless someone is paying you. Chris Hansen, KQ6DW (also formerly in W2SZ) From amsoft@epix.net Sat Jul 27 19:19:12 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!news.cais.net!world1.bawave.com!newsfeed.internetmci.com!uwm.edu!news.nap.net!fred.enteract.com!ix.netcom.com!news From: AC6V Newsgroups: rec.radio.amateur.homebrew Subject: Re: TV Frequinces Date: Wed, 24 Jul 1996 06:06:01 -0700 Organization: Author Lines: 24 Message-ID: <31F61FB9.2C1E@ix.netcom.com> References: <31F5CBE5.70C6@mailhost.oxford.net> NNTP-Posting-Host: esc-ca1-22.ix.netcom.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-NETCOM-Date: Wed Jul 24 6:05:44 AM PDT 1996 X-Mailer: Mozilla 2.01 (Win95; U) To: A Guy named Moe A Guy named Moe wrote: > > How can I find out the frequences that TV stations are using? Yo Moe! Go to URL: http://www.planet.net/fccindex/10_khz.html#30_MHz This is for on the air channels. For Cable Frequencies, go to: http://www.planet.net/fccindex/cablech.html Best Regards from San Diego Rod I transmit, therefore I am, I think!! -- Hark for I have hurled my words to the far reaches of the earth! What King of old could do thus?? ..... AC6V From amsoft@epix.net Sat Jul 27 19:19:13 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!nntp.coast.net!zombie.ncsc.mil!newsgate.duke.edu!agate!info.ucla.edu!newsfeed.internetmci.com!news.kei.com!news.texas.net!nntp.primenet.com!news.cais.net!mr.net!winternet.com!tclbbs.com!jim.hammock From: jim.hammock@tclbbs.com (Jim Hammock) Newsgroups: rec.radio.amateur.homebrew Subject: wanted schematic for pro Date: Fri, 26 Jul 1996 05:16:00 GMT Message-ID: <1942484012-960725231600@tclbbs.com> Organization: The City Lights BBS Distribution: world Lines: 24 On 07-19-96 16:14, PETERW@DYSON.BRISNET.ORG was talking to ALL about wanted schematic for pro: PE>From: peterw@dyson.BRisnet.ORG.AU (Peter L. Williamson) PE>Newsgroups: rec.radio.amateur.homebrew PE>Subject: wanted schematic for pro-2023 scanner PE>Organization: ucsd usenet gateway PE>Can anybody help me with a schematic for the Tandy (Radio Shack) scanne PE>model pro-2023? PE>Tnx. Peter VK4AWP. If the model is the PRO-23 you can order the service manual from Radio Shack using RSU number 10823375. You can get a parts lis faxed to you by calling 1-800-323-6586, following the directions and entering 21375 for the docuent number. Hope it helps! Jim KI0DN --- * PW * Old days: Wine, Women, Song. Now days: Coffee, Computers, From amsoft@epix.net Sat Jul 27 19:19:14 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.megalink.net!imci4!newsfeed.internetmci.com!swrinde!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!news From: Charlie Panek Newsgroups: rec.radio.amateur.homebrew Subject: Re: Source of Ferrite Beads? Date: Mon, 22 Jul 1996 16:34:04 -0700 Organization: Hewlett-Packard Co. Lines: 26 Message-ID: <31F40FEC.7D5D@lsid.hp.com> References: <31F006C4.7BA0@lamar.colostate.edu> NNTP-Posting-Host: labcrp.lsid.hp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.02 (X11; I; HP-UX A.09.05 9000/715) To: fiz fiz wrote: > > Hi, > > Can anyone recommend a place to get ferrite beads big enough to slip over > RG-58? They don't need to slip over the BNC connector, only the cable, > 0.2" OD. > > ttfn fiz (KG0YG) Unfortunately FT-43-XX cores are just a little too small to fit ober RG-58, so you'd need to get FT-50 cores. I think for RFI supression/ choking at HF, a -43 or -77 mix is what you want. Dan's Small Parts has prices on Ferrite cores that are much better than Amidon or Palomar. (FT-50-43 are 3/$1.25) Check out his catalog: http://www.fix.net/dans.html (I have no affiliation with Dan's Small Parts, except that I just placed an order for some cores from him... We'll see if they arrive ok) -- Charlie Panek Hewlett Packard Company charlier@lsid.hp.com Lake Stevens Division Everett, Washington From amsoft@epix.net Sat Jul 27 19:19:17 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!EU.net!Belgium.EU.net!chaos.kulnet.kuleuven.ac.be!usenet From: Peter.Delmotte@mech.kuleuven.ac.be (Peter Delmotte) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Digital Microwave Radio - 1200bps stinks! Date: 24 Jul 1996 16:07:36 GMT Organization: K.U.Leuven Lines: 26 Message-ID: <4t5ho8$t1f@chaos.kulnet.kuleuven.ac.be> References: <4smur8$8r4@agate.berkeley.edu> <31F2F5A8.856@hal-pc.org> <4t0gmh$hrv@rosebud.sdsc.edu> <1996Jul23.150748.9040@ke4zv.atl.ga.us> <1996072322590470432@zetnet.co.uk> NNTP-Posting-Host: pc093.mech.kuleuven.ac.be Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 In article <1996072322590470432@zetnet.co.uk>, frank.dinger@zetnet.co.uk says... > :Gary ,Could you please educate me . Having read an article in QST on :'ready for 9600Baud'FM radios ,I understood that all the :Yaesu-Kenwood-Icom-etc VHF/UHF radios, ready for 9600Baud, had a :separate TNC output port which in fact inputs the TNC output directly :to the varactor circuit ,thus bypassing the '300-3000Hz conditioned :mike amp '. This is because the 9600Baud signal audio spectrum runs :from very low to approx 7200Hz.(?) :I can't imagine that the 9600Baud connection on some rigs is a fake, :although some rigs appear to have a lower Bit Error Rate (BER) than others. :Frank Dinger , Inver by Tain , Ross-shire - Scotland UK : Even with an input directly to the varactor circuit, there still is a problem: the PLL. It doesn't do to much to the higher frequencies, but the lower ones (e.g. below 300Hz) are filtered out by the PLL, trying to keep the frequency "right". Only a modulator _outside_ the PLL loop can give you a flat frequency response down to DC. (I admit, you don't need DC, but the lower you get, the better.) In my opinion, the best 9600 radios are multi-mode rigs with a fixed-frequency modulator (no PLL!), fed into a mixer. Peter From amsoft@epix.net Sat Jul 27 19:19:19 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.clark.net!world1.bawave.com!news2.cais.net!news.cais.net!hunter.premier.net!news.uoregon.edu!arclight.uoregon.edu!dispatch.news.demon.net!demon!zetnet.co.uk!usenet From: Frank Dinger Newsgroups: rec.radio.amateur.homebrew Subject: Re: Digital Microwave Radio - 1200bps stinks! Date: Tue, 23 Jul 1996 22:59:04 +0100 Lines: 29 Message-ID: <1996072322590470432@zetnet.co.uk> References: <4smur8$8r4@agate.berkeley.edu> <31F2F5A8.856@hal-pc.org> <4t0gmh$hrv@rosebud.sdsc.edu> <1996Jul23.150748.9040@ke4zv.atl.ga.us> NNTP-Posting-Host: piccadilly.zetnet.co.uk X-Mailer: ZIMACS Version 1.09u 10001740 ---------snipped > Except for a couple of purpose made data radios, 9600 baud is > going to require modifications to a FM voice radio to work > (despite radio manufacturer advertising hype of "9600 baud > ready" included with virtually every new radio marketed, > which really only means they included a jack labeled "data" > on the back panel). Joe HT isn't going to do those modifications, > and anybody capable of doing them is also capable of going to > the next level. So I see 9600 baud over FM voice radios as a > dead end. (If the manufacturers ever *really* make their radios > "9600 baud ready", then that would be a different story.) ---------snipped > Gary Coffman KE4ZV ------------------ Gary ,Could you please educate me . Having read an article in QST on 'ready for 9600Baud'FM radios ,I understood that all the Yaesu-Kenwood-Icom-etc VHF/UHF radios, ready for 9600Baud, had a separate TNC output port which in fact inputs the TNC output directly to the varactor circuit ,thus bypassing the '300-3000Hz conditioned mike amp '. This is because the 9600Baud signal audio spectrum runs from very low to approx 7200Hz.(?) I can't imagine that the 9600Baud connection on some rigs is a fake, although some rigs appear to have a lower Bit Error Rate (BER) than others. Frank Dinger , Inver by Tain , Ross-shire - Scotland UK e-mail : gm0csz.kn6wh@ukrs.org Packet : GM0CSZ @ GB7NOS.#76.GBR.EU From amsoft@epix.net Sat Jul 27 19:19:21 1996 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp.coast.net!sgigate.sgi.com!newsfeeder.sdsu.edu!in-news.erinet.com!ddsw1!news.mcs.net!nntp.primenet.com!news.cais.net!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Digital Microwave Radio Message-ID: <1996Jul22.160835.4408@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4smur8$8r4@agate.berkeley.edu> <4snmlr$1kn4@mule2.mindspring.com> <31F33A3C.78E@ens.ascom.ch> Date: Mon, 22 Jul 1996 16:08:35 GMT Lines: 30 Xref: news2.epix.net rec.radio.amateur.homebrew:16218 rec.radio.amateur.digital.misc:16559 In article <31F33A3C.78E@ens.ascom.ch> Robert Ganter wri tes: >Bob Merritt wrote: >> >> nickkral@america.CS.Berkeley.EDU (Nick Kralevich) wrote: >> >> >Does anyone know of a design for a digital microwave transmitter/receiver >> >combo that is available on the internet or in book form? Or >> >perhaps I'm going about this in the wrong direction... >> >> Go to the nearest ham radio store and buy a copy of the ARRL Handbook >> for Radio Amateurs and then read up on the 10Ghz Gunnplexor/2MBPS >> project....Oops, wait a moment, this article is not any more in the ARRL Ha ndbook >anymore! It can be found in another book published by the ARRL. Can't >tell You which at the moment, because I have the books at home. Maybe >somebody else can help here? >Or try http://www.arrl.org > >Regards > >Robert (HB9NBY) It's now in _Packet, Speed and More Speed_ also published by the ARRL. Good book. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Sat Jul 27 19:19:23 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!hunter.premier.net!news.cais.net!van-bc!news.mindlink.net!sol.ctr.columbia.edu!news.ess.harris.com!usenet From: Paul Anderson Newsgroups: rec.radio.amateur.homebrew Subject: Re: Helical Filters Date: Thu, 25 Jul 1996 14:38:45 -0400 Organization: Harris Corp Lines: 33 Message-ID: <31F7BF35.57AA@harris.com> References: <4t880n$9ii@synthemesc.insync.net> NNTP-Posting-Host: pander01.ess.harris.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win16; I) erikc wrote: > > Can anybody out there explain to me what a "helical filter" > is and how it works. This is a new one on me. Thanks. > Sometimes they are also called helical resonators. Generally, one consists of a cavity (a metal can), a coil (inside the cavity, connected to it at one end, and unconnected at the other end), and a tuning screw (usually running down thru the coil). At the helical filter's resonant frequency, it's inductive reactance (inductance from the coil) will cancel it's capacitive reactance (capacitance between the coil and the tuning screw & cavity). Often the filters are stacked together, with coupling via "windows" in the sides of the cavities. A signal can be put into the first stacked coil via a hardwired tap; likewise the signal can be tapped off of the last stacked coil. It is a high-Q device, with lots of rejection out of its passband. Not as high as a "cavity filter," but much smaller and much less expensive. You will see a lot of them used as preselectors in receiver front-ends. If the tx/rx split is wide enough, they can also be used as filters in relatively inexpensive duplexers. -- 7777777 3333333 **************************************** 77 33 ** Paul Anderson, AB4VA ** 77 33 ** pander01@harris.com ** 77 33 ** AB4VA @ KT4DI.#MLBFL.FL.USA.NA ** 77 33 33 **************************************** 77 33 From amsoft@epix.net Sat Jul 27 19:19:24 1996 Path: news2.epix.net!uunet!inXS.uu.net!newsfeed.internetmci.com!news.sprintlink.net!new-news.sprintlink.net!news.mindspring.com!usenet From: bobm@mindspring.com (Bob Merritt) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: Digital Microwave Radio Date: Sat, 20 Jul 1996 13:40:15 GMT Organization: MindSpring Enterprises Lines: 34 Message-ID: <4sqnp2$1dho@mule2.mindspring.com> References: <4smur8$8r4@agate.berkeley.edu> <4snmlr$1kn4@mule2.mindspring.com> <4sp4tr$bhu@agate.berkeley.edu> Reply-To: bobm@mindspring.com NNTP-Posting-Host: user-168-121-22-109.dialup.mindspring.com X-Newsreader: Forte Free Agent 1.0.82 Xref: news2.epix.net rec.radio.amateur.homebrew:16214 rec.radio.amateur.digital.misc:16555 nickkral@america.CS.Berkeley.EDU (Nick Kralevich) wrote: >>Oh the >>guys over in Utah have put together a T1 system, do a search to find >>more info on it... >Do you have a hint for what to search for? hmmm... good question, I haven't looked as yet myself. I do know that they've designed their own T1 modem for some surplus microwave radio they had.... >I was hoping to avoid "off the shelf" solutions due to their high cost. >Besides, it would be interesting to experiment with building equipment >like this. Wavelans cards are not that expensive and may do just the trick for you. TAPR just placed a group order for the cards with somebody and they had the price down to ~$200 per card... >Oh, one more question. Do you have any idea how much this type of >project would cost? welll a PC on each end (if you dont have them already) ~$2000 or less... 2 wavelan cards for $400 A good pair of yagi's for 900 Mhz... $300 unless you make them yourself! and good quality hardline and some bnc adapters....? So figure ~$3000 total... $1500 per node is about right Bob ---- Bob Merritt KA4BYP http://www.mindspring.com/~bobm From amsoft@epix.net Sat Jul 27 19:19:26 1996 Path: news2.epix.net!uunet!in3.uu.net!EU.net!chsun!news.eunet.ch!ascomax.hasler.ascom.ch!usenet From: Robert Ganter Newsgroups: rec.radio.amateur.homebrew Subject: Re: buidling a transmiter Date: Thu, 25 Jul 1996 08:45:02 +0200 Organization: Ascom Business Systems AG Lines: 34 Message-ID: <31F717EE.4FBF@ens.ascom.ch> References: <31EEEA66.5B2B@mailhost.oxford.net> <31F44670.7875@flinet.com> NNTP-Posting-Host: pcts72.ens.ascom.ch Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.02 (Win16; I) (Shawn Kubik) wrote: -----------------^^^^^^ > > I am looking for plans to build a FM Transmiter. I realy what plans > for a transmiter no mater how big or small > > thanksOxford? How about correct spelling? Ok, don't want to be a flamer now... I have seen several posts from You recently, and in none of them it was clear, what You exactly wanted (or it was written so generally, that it was impossible to answer). Try to use the following hints: - before posting: Think *clearly* about, what You want to know, then post Your question. - Using a spelling checker (or have a look in a dictionary, if You don't know, how to write a word) is not a shame. IMHO the spelling and grammatical errors You see in posts (from people with English as their native language) is unbelievable. If this is our future... For me, English is a foreign language I had to learn pretty hard to get used to it. But I try to use it thoroughly. Try to get some books about Amateur Radio. They are full of plans for any kind of Radio stuff. The ARRL (American Radio Relay League) ist a first class address for such books (http://www.arrl.org). To use a transmitter (except assembled low power transmitters on some frequencies) You need a license (e.g. Amateur Radio). Transmitting on frequencies not covered by this licence is illegal and may be damned expensive, if You are caught. Ok, take a breath, think about, what You want and then ask again. Regards Robert From amsoft@epix.net Sat Jul 27 19:19:27 1996 Path: news2.epix.net!uunet!in2.uu.net!news.deltanet.com!news.deltanet.com!jlundgre From: jlundgre@delta1.deltanet.com (John Lundgren) Newsgroups: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew Subject: Re: 100 Mhz band converter Followup-To: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew Date: 26 Jul 1996 12:16:41 GMT Organization: Delta Internet Services, Anaheim, CA Lines: 35 Message-ID: <4tacv9$t2v@news02.deltanet.com> References: NNTP-Posting-Host: nfs3.delta.net X-Newsreader: TIN [version 1.2 PL2] Xref: news2.epix.net sci.electronics.misc:8147 sci.electronics.design:10288 rec.video.satellite.tvro:30712 rec.radio.amateur.homebrew:16265 Steve Work (slwork@netcom.com) wrote: : I am trying to build or obtain a device which can translate signals from : from the 0-4Mhz band up by 100Mhz (which is in the FM broadcast band, : 100-104Mhz). This will be used in conjuction with an FM broadcast : receiver to demodulate FM signals which are in the 0-4Mhz range. I've : heard that such devices exist, but am unable to locate one. Does anyone : know who sells something like this or plans on how to make one? First off, the 0 to 4 MHz band is AM, so if you upoconvert these signals to the 100 to 104 MHz range, you will need an AM receiver to listen to them. All the receivers that I've seen in that band are FM, so you may have an insurmountable problem. : Or could you perhaps "hack" a device which modulates video for RF on : channel 3 or 4 (60-70Mhz). Does anyone know any details on how this could : be done? You can make a RF front end that preamps the 0 to 4 MHz and then mises it with a 100 MHz oscillator. But the 0 end of the band will be too close to the osc and the receiver will be desensed if it gets too close to the 100 MHz osc output. -- #===================================================================# | John Lundgren - Elec Tech - Info Tech Svcs. | jlundgre@ | | Rancho Santiago Community College District | deltanet.com | | 17th St at Bristol \ Santa Ana, CA 92706 | http://www.rancho| | My opinions are my own, and not my employer's. | .cc.ca.us | | Most FAQs are available through Thomas Fine's WWW FAQ archive: | |http://www.cis.ohio-state.edu:80/hypertext/faq/usenet/FAQ-List.html| | "Babe Ruth struck out 1,330 times... keep on swinging." | | says the lid on the jar of Laredo & Lefty's Picante Salsa | #======P=G=P==k=e=y==a=v=a=i=l=a=b=l=e==u=p=o=n==r=e=q=u=e=s=t======# From amsoft@epix.net Sat Jul 27 19:19:28 1996 Path: news2.epix.net!uunet!in3.uu.net!news1.erols.com!news From: Steve Ickes Newsgroups: rec.radio.amateur.homebrew Subject: Re: AM Modulation with SS Amps. Date: Thu, 25 Jul 1996 17:27:42 -0700 Organization: A poorly-installed InterNetNews site Lines: 37 Message-ID: <31F810FE.27C2@pop.erols.com> References: <4t5fch$aqu@globe.indirect.com> <4t6m7t$cg9@newsbf02.news.aol.com> NNTP-Posting-Host: col-as5s01.erols.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win16; U) W8JI Tom wrote: > > In article <4t5fch$aqu@globe.indirect.com>, jeffd@coriolis.com (Jeff > Duntemann) writes: > > >Excellent! I hadn't thought of this. I have a reasonably husky 2.5V > >filament transformer on the shelf (those were for 866A rectifiers, > >right?) which would give a 48:1 ratio, and if fed with a 4 ohm audio > >power source (which most of the solid state amps deliver) would match > >about 9K ohms in the plate circuit, which is doable with most of the > >tubes I'd be willing to fool with. I guess the unanswered question is > >whether a 2.5V filament transformer would clip the audio frequencies > >even further; I'm not sure what the governing physics is in this case. > >I would guess the audio response would be better but I'm not sure. > >Any thoughts there? > > Audio response is limited by core eddy currents causing a loss of > permeability as frequency is raised, and by the winding method. Good audio > transformers have the windings interleaved, so flux losses are reduced and > coupling is improved. > > Remember the power amplifier MUST be class C to be properly modulated, and > if it's a tetrode the screen must also be tickled with a little audio. If > it's a triode, the preceeding stage also may need to be modulated. > > 73 TomThe high freqy response of the transformer is determined by the interwinding capacitance. The leakage inductance also plays a big factor. Several years back, Glass Audio magazine had a great reprint article on transformer design amd construction. Check it out if you can get a copy. The screen can easily be modulated by deriving the screen voltage thu an appropriate sized dropping resistor off the high side of the mod transformer secondary to the screen. Steve WB3HUZ From amsoft@epix.net Sat Jul 27 19:19:30 1996 Path: news2.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!globe.indirect.com!usenet From: jeffd@coriolis.com (Jeff Duntemann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: AM Modulation with SS Amps. Date: Wed, 24 Jul 1996 14:25:11 GMT Organization: The Coriolis Group, Inc. Lines: 41 Message-ID: <4t5fch$aqu@globe.indirect.com> References: <199607191334.AA10521@rsa.rsa.cirrus.com> NNTP-Posting-Host: 165.247.88.202 X-Newsreader: Forte Free Agent 1.0.82 dougt@rsa.cirrus.COM (Doug Thomson) wrote: > I have done this using a filament power transformer run backwards. A >5.0 V secondary filament X-former with a 120 V pri, has a turns ratio >of approx. 24 to 1. Now runing it backswards and feeding the output >of a solid state amp @ 8 ohms gives an output impedance of 4.6 K >(the square of the turns ratio times the pri impedance). A 6146 >running at 750 v and 150 ma needs a 5K laod, pretty close. If the >filament X-former is rated at 4A secondary, the pri current is 166 >ma. Using a power x-former allows for load current to follow without >saturating the core. The frequency response is not very good, the >power x- former was designed to run at 60Hz, but I found that most x- >former gave 2+ Khz top end, plenty good for AM, as a mater of fact >the bandwidth need to be limited from the SS bandwidth of greater than >20 Khz. > Hope this helps. 73s > > Douglas K. Thomson, KB4OQO > E-mail: d.k.thomson@ieee.org > Excellent! I hadn't thought of this. I have a reasonably husky 2.5V filament transformer on the shelf (those were for 866A rectifiers, right?) which would give a 48:1 ratio, and if fed with a 4 ohm audio power source (which most of the solid state amps deliver) would match about 9K ohms in the plate circuit, which is doable with most of the tubes I'd be willing to fool with. I guess the unanswered question is whether a 2.5V filament transformer would clip the audio frequencies even further; I'm not sure what the governing physics is in this case. I would guess the audio response would be better but I'm not sure. Any thoughts there? Thanks for your response. I KNEW there'd be a use for that old 2.5V transformer one of these days... --73-- --Jeff Duntemann KG7JF Scottsdale, Arizona From amsoft@epix.net Sat Jul 27 19:19:31 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news-res.gsl.net!news.gsl.net!news.mathworks.com!newsfeed.internetmci.com!news.sgi.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail From: stevem@best.com (Stephen Muther) Newsgroups: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew Subject: Re: 100 Mhz band converter Date: 25 Jul 1996 16:24:01 -0700 Organization: BEST Internet Communications Lines: 42 Message-ID: <4t8vmh$qjf@shellx.best.com> References: <31f7f8cd.1183837@news.intr.net> NNTP-Posting-Host: shellx.best.com Xref: news2.epix.net sci.electronics.misc:8120 sci.electronics.design:10246 rec.video.satellite.tvro:30668 rec.radio.amateur.homebrew:16255 In article <31f7f8cd.1183837@news.intr.net>, Rod Hewitt wrote: >slwork@netcom.com (Steve Work) wrote: > >>I am trying to build or obtain a device which can translate signals from >>from the 0-4Mhz band up by 100Mhz (which is in the FM broadcast band, >>100-104Mhz). This will be used in conjuction with an FM broadcast >>receiver to demodulate FM signals which are in the 0-4Mhz range. I've >>heard that such devices exist, but am unable to locate one. Does anyone >>know who sells something like this or plans on how to make one? >> >>Or could you perhaps "hack" a device which modulates video for RF on >>channel 3 or 4 (60-70Mhz). Does anyone know any details on how this could >>be done? > >I tried hooking up an RF modulator to the baseband video output and >then tuned it with a TV-Band radio. Didn't have much luck with any FM2 >stuff because the bandwidth of the radio was too great, but it did >work - I could tune the audio subcarriers quite easily. > >Regards, >Rod > This technique does work. I just used a bench signal generator, and later I used an old International Crystal oscillator module to drive the LO port of a Mini-Circuits SBL series mixer. The signals from the satellite receiver are a bit high, so some attenuation may be needed. I did not need any RF or IF amplifiers or filters around the mixer. The Bandwidth problem can be solved if you put narrower filters in the IF of the FM receiver. These filters can be had from the Toko section if the Digi-Key catalog if I remember correctly. You can either make a narrow dedicated receiver or, as I did, you can make sockets for the filters using 3 pins from a machined IC socket. Have Fun Steve Muther WF6R From amsoft@epix.net Sat Jul 27 19:19:32 1996 Path: news2.epix.net!uunet!in3.uu.net!noos.hooked.net!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail From: stevem@best.com (Stephen Muther) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Prototyping boards for SMD? Date: 23 Jul 1996 11:04:23 -0700 Organization: BEST Internet Communications Lines: 52 Message-ID: <4t3477$ej4@shellx.best.com> References: NNTP-Posting-Host: shellx.best.com In article , Ian White, G3SEK wrote: > >Many potentially useful new ICs are only available in SMD "SO" outlines >based on a 0.05-inch pin pitch. How do you work with these ICs on >ordinary 0.1-inch prototyping boards? > >Has anybody seen such things as SMD to standard DIL adaptors for 8-pin >and 16-pin SMD ICs? I'm thinking of something like a small PCB with >tracks for 0.05-inch DIL SMDs, that would fan out to the standard >0.1-inch DIL pitch. Such adaptor boards could be either dropped onto a >standard DIL header or wire-linked through to 0.1-inch tracks. > >I suppose the other alternative would be to glue the SMD straight onto a >0.1-inch DIL header and wire it up by hand. > >Are there any 0.1-inch prototyping stripboards like Veroboard/ >Vectorboard but with some provisions for 0.05-inch SMDs? > >And what about "SSO" devices using 0.025-inch pin spacing? > > >73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' > 'In Practice' columnist for RadCom (RSGB) >Professionally: >IFW Technical Services Clear technical English - world-wide. There are, here in the USA, several different brands of small prototyping boards which hold one or more standard SO devices and fan the leads out for conventional wiring techniques. The brand name Serfboards comes to mind. I think Digi-Key might sell them by mail. Seach for their WEB page. I have had some success using deadbug techniques with SMT devices on solid copper PCB scrap. I have even done microwave circuits using zero lead length techniques with SMT devices on solid copper at frequencies up to 6GHz. It can be done, some of the tools to find for your shop which are helpful are fine point soldering iron, stereo microscope and an assortment of tweezers. There are also the many different techniques of doing homebrew PCBs. I'd be interested in others experiences as well. The techniques of homebrew are definatly changing. As a microwave enthusiast, I wonder when someone will figure out practical ways to do die attach and microbonding at home! Steve Muther WF6R From amsoft@epix.net Thu Aug 01 21:22:34 1996 Path: news2.epix.net!uunet!in3.uu.net!news.compuserve.com!ix.netcom.com!news From: gsparks@ix.netcom.com(Glenn Sparks) Newsgroups: rec.radio.amateur.homebrew Subject: Re: TV Frequinces Date: 26 Jul 1996 13:37:38 GMT Organization: Netcom Lines: 28 Message-ID: <4tahn2$k06@dfw-ixnews8.ix.netcom.com> References: <31F5CBE5.70C6@mailhost.oxford.net> <31F7C68D.3725@vcd.hp.com> NNTP-Posting-Host: hou-tx2-19.ix.netcom.com X-NETCOM-Date: Fri Jul 26 8:37:38 AM CDT 1996 In <31F7C68D.3725@vcd.hp.com> Don Huff writes: > >A Guy named Moe wrote: >> >> How can I find out the frequences that TV stations are using? > >Moe, > > It would help if you would use a dictionary or spell checker >on your posts. (RE: ANTANNA for antenna, FREQUINCES for frequencies, >etc!). > > Look in any ARRL Handbook for all the information you bave requested. ^^^^ > In there you will learn that each TV station has a picture carrier >which is amplitude modulated (AM). In addition there is a sound >carrier, which is frequency modulated (FM). Each channel occupies 6 MHz >of assigned channel bandwidth. > > GL and 73, > > Don, W6JL And what spell checker do you use, that includes the word bave? People who live in glass houses should not throw stones. Glenn Sparks From amsoft@epix.net Thu Aug 01 21:22:35 1996 Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!netnews.worldnet.att.net!newsadm From: "Steve Kittelsen" Newsgroups: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew Subject: Re: 100 Mhz band converter Date: 27 Jul 1996 22:45:37 GMT Organization: AT&T WorldNet Services Lines: 12 Message-ID: <01bb7c0d$50a48940$df0b74cf@stevekit> References: <31f7f8cd.1183837@news.intr.net> <4t8vmh$qjf@shellx.best.com> <31f88580.1365215@139.187.128.43> NNTP-Posting-Host: 223.middletown-62.va.dial-access.att.net X-Newsreader: Microsoft Internet News 4.70.1132 Xref: news2.epix.net sci.electronics.misc:8177 sci.electronics.design:10329 rec.video.satellite.tvro:30741 rec.radio.amateur.homebrew:16279 > Look into the Phillips NE602 LO/Mixer chip. Very simple and works > well. You can find a working schematics of the circuit at http://home.eznet.net/redline/steve/ SK * stevekit@worldnet.att.net * steve_kittelsen@wxxi.pbs.org * O P E N Y O U R M I N D ... G**********A********************Y***************PRIDE********! From amsoft@epix.net Thu Aug 01 21:22:36 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!newsreader.sprintlink.net!news.sprintlink.net!news-ana-24.sprintlink.net!news.fibr.net!nntp.primenet.com!uunet!in3.uu.net!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: kj4uo@aol.com (KJ4UO) Newsgroups: rec.radio.amateur.homebrew Subject: Amp Parts FS: Date: 27 Jul 1996 23:55:13 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 17 Sender: root@newsbf02.news.aol.com Message-ID: <4teob1$bd7@newsbf02.news.aol.com> Reply-To: kj4uo@aol.com (KJ4UO) NNTP-Posting-Host: newsbf02.mail.aol.com Hi, I have the following items up for Best Offer: 1: Two sockets for the 4CX250's or 4CX150's These were removed from a FM broacast Transmitter which were manufactured by Gates/Harris. This Xmitter was removed from service about six months ago. 2: Two 4CX150's which were used in the above. The Xmitter was ran at 200 watts and the tubes were replaced ever 3 months. If interested, sent e-mail to KJ4UO@AOL.COM Thanks! From amsoft@epix.net Thu Aug 01 21:22:37 1996 Path: news2.epix.net!uunet!in3.uu.net!newsfeed.internetmci.com!newsreader.sprintlink.net!news.sprintlink.net!news-ana-7.sprintlink.net!newsfeed.concentric.net!news-master!news From: k9uwa@cris.com (John Goller) Newsgroups: rec.radio.amateur.homebrew Subject: FS: 4cx1000a + socket Date: 28 Jul 1996 06:25:19 GMT Organization: Concentric Internet Services Lines: 4 Message-ID: <4tf14f$plj@herald.concentric.net> NNTP-Posting-Host: crc8.cris.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 For Sale 4cx1000a tube and Eimac Y-149a socket Tube is tested and works fine....full output!! 1.6 KW make offer de JOHN K9UWA From amsoft@epix.net Thu Aug 01 21:22:38 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!portc01.blue.aol.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: ptracy@aol.com (PTracy) Newsgroups: rec.radio.amateur.homebrew Subject: Re: SPELLING PLEASE Date: 28 Jul 1996 07:59:20 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 11 Sender: root@newsbf02.news.aol.com Message-ID: <4tfkmo$l0j@newsbf02.news.aol.com> References: <4t8quj$k9f@news2.h1.usa.pipeline.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4t8quj$k9f@news2.h1.usa.pipeline.com>, art2@usa.pipeline.com(Art) writes: >For the life of me I can't understand why full fledged >hams insist on spelling "reciever" instead of "RECEIVER". > "I" before "E", except after "C", or when sounding like "A" in neighbor or weigh. That how I remember it. Takes too many brain cells I guess. KE1C From amsoft@epix.net Thu Aug 01 21:22:38 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.asu.edu!ennfs.eas.asu.edu!cs.utexas.edu!math.ohio-state.edu!uwm.edu!news-res.gsl.net!news.gsl.net!ix.netcom.com!news From: ccashion@ix.netcom.com (charles cashion ) Newsgroups: rec.radio.amateur.homebrew Subject: need SAMS Photofact CB-64 Date: 28 Jul 1996 15:32:07 GMT Organization: Netcom Lines: 14 Message-ID: <4tg15n$rep@dfw-ixnews8.ix.netcom.com> References: <31FAA0DD.1EDE@pop.erols.com> NNTP-Posting-Host: dal-tx1-57.ix.netcom.com X-NETCOM-Date: Sun Jul 28 10:32:07 AM CDT 1996 I would like to convert a Midland 13-386 from SSB to 10 meters. (With luck, it will be finished before the sunspots return) The conversion would be easier if I could find a SAMS Photofact volume CB-64. If you have one you would sell, please let me know. If you have one and you would be willing to xerox those pages, I would pay for that. If know somebody that sells them, and they still have this volume, that would be helpful. As a last resort, if you simply want to give me a copy, I would be grateful. 72s, 73s, whatever it takes, Charles Cashion W5ISZ ccashion@ix.netcom.com work ccashion@spd.dsccc.com From amsoft@epix.net Thu Aug 01 21:22:39 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news.inc.net!uwm.edu!news-res.gsl.net!news.gsl.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.flinet.com!news From: duane Newsgroups: rec.radio.amateur.homebrew Subject: Re: strange 10m converted CB SSB RF problem Date: Mon, 29 Jul 1996 00:00:34 -0400 Organization: personal Lines: 12 Message-ID: <31FC3762.797@flinet.com> References: <4tg356$pp0@newsbf02.news.aol.com> <4tha6f$c0n@newsbf02.news.aol.com> Reply-To: duane@flinet.com NNTP-Posting-Host: wpb196.flinet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5aGold (Win95; I) To: Ken McCoy Ken McCoy wrote: > > I should have defined the subject as a strange *question*. :) I'm brand > new to SBB and got confused over the meter jumping around. > > Anyway, thanks to all for the courteous replies. > > Ken > KF4BQF the legal limit for ssb for the CB was 12 watts so that is most likely to be the power out put for the 10 meter band after the conversion. duane ab4be From amsoft@epix.net Thu Aug 01 21:22:40 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.inc.net!newspump.sol.net!spool.mu.edu!agate!howland.reston.ans.net!news-e2a.gnn.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: tubebuyer@aol.com (TUBEBUYER) Newsgroups: rec.radio.amateur.homebrew Subject: Wanted: Triodes, WE Stuff Date: 29 Jul 1996 01:05:52 -0400 Organization: America Online, Inc. (1-800-827-6364) Lines: 8 Sender: root@newsbf02.news.aol.com Message-ID: <4thgrg$etd@newsbf02.news.aol.com> Reply-To: tubebuyer@aol.com (TUBEBUYER) NNTP-Posting-Host: newsbf02.mail.aol.com I looking for triodes to use in audio amplifier projects, as well as transformers, etc that I can use. . I also collect almost anything manufactured by Western Electric. I have Ham gear and cash to trade. Thanks and Best Regards, Rick From amsoft@epix.net Thu Aug 01 21:22:41 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!news.sprintlink.net!news-dc-10.sprintlink.net!news.indy.net!ip38 From: johnoz@indy.net (Occolowitz John) Newsgroups: rec.radio.amateur.homebrew Subject: Please identify Thordarson transformer. Date: 29 Jul 1996 03:54:19 GMT Organization: IndyNet - Indys Internet Gateway Lines: 5 Message-ID: <4thclb$c93@news.indy.net> NNTP-Posting-Host: ip38.slip.indy.net X-Newsreader: News Xpress Version 1.0 Beta #3 I have a Thordarson transformer Type T-21P83. Appears to be plate transformer about 1250V-CT-1250V secondary and primary with one tap. Does anybody have specs. for this transformer? Thanks. JohnO. KB9MIE. From amsoft@epix.net Thu Aug 01 21:22:42 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.voicenet.com!netaxs.com!op.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!swrinde!elroy.jpl.nasa.gov!lll-winken.llnl.gov!fnnews.fnal.gov!nntp-server.caltech.edu!tom-dunn.caltech.edu!user From: dunnt@starbase1.caltech.edu (Tom Dunn) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Please identify Thordarson transformer. Date: Mon, 29 Jul 1996 08:12:36 -0800 Organization: Caltech Lines: 13 Message-ID: References: <4thclb$c93@news.indy.net> NNTP-Posting-Host: tom-dunn.caltech.edu In article <4thclb$c93@news.indy.net>, johnoz@indy.net (Occolowitz John) wrote : > I have a Thordarson transformer Type T-21P83. Appears to be plate transforme r > about 1250V-CT-1250V secondary and primary with one tap. Does anybody have > specs. for this transformer? > > Thanks. JohnO. KB9MI E Thordarson catalog number 610 list the 21P83 as having a secondary voltage of 1250-0-1250, or 1560-0-1560. The catalog states "Secondary voltage may be changed by primary tap. Either of the given voltages are available." The secondary current rating is 200ma. It is 115vac primary. 73 Tom WB6IQD From amsoft@epix.net Thu Aug 01 21:22:43 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!tezcat.com!netaxs.com!hunter.premier.net!news-res.gsl.net!news.gsl.net!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!lade.news.pipex.net!pipex!tube.news.pipex.net!pipex!weld.news.pipex.net!pipex!plug.news.pipex.net!pipex!hole.news.pipex.net!pipex!bt!usenet From: Paul Beastall Newsgroups: rec.radio.amateur.homebrew Subject: Re: High voltage transformers Date: 29 Jul 1996 16:57:30 GMT Organization: BT Labs Lines: 14 Message-ID: <4tiqhq$bq1@pheidippides.axion.bt.co.uk> References: <4t83tj$n0r@pheidippides.axion.bt.co.uk> <31F8BA88.918@microdes.com> NNTP-Posting-Host: pc1.garden.bt.co.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) I know I am replying to my own post but following a call to Peter Dahl & Co I thought people may like to know that they have a web site now on http://www.1eagle1.com/commercial/pwdco/ I hope that is sueful to some people 73 Paul Beastall, G1WBZ Ipswich, UK. From amsoft@epix.net Thu Aug 01 21:22:43 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.mathworks.com!newsfeed.internetmci.com!in3.uu.net!jaring.my!usenet From: kurang ajar Newsgroups: sci.electronics.misc,sci.electronics.design,rec.video.satellite.tvro,rec.radio.amateur.homebrew Subject: Re: 100 Mhz band converter Date: Mon, 29 Jul 1996 18:41:06 +0800 Organization: VASB Lines: 4 Message-ID: <31FC9542.144E@pc.jaring.my> References: <4tacv9$t2v@news02.deltanet.com> <01bb7afa.0cd4b5a0$8e0446c7@stevekit> <31FC2BC7.964@internetmci.com> Reply-To: agzol@pc.jaring.my NNTP-Posting-Host: j40.jrc7.jaring.my Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0b5aGold (Win95; I) Xref: news2.epix.net sci.electronics.misc:8180 sci.electronics.design:10333 rec.video.satellite.tvro:30745 rec.radio.amateur.homebrew:16281 pls. email me the ckt diagram of the above converter agzol@pc.jaring.my From amsoft@epix.net Thu Aug 01 21:22:44 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.infi.net!newsfeed.direct.ca!op.net!hunter.premier.net!news-res.gsl.net!news.gsl.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.compuserve.com!ix.netcom.com!news From: kproctor@ix.netcom.com (Just Me) Newsgroups: rec.radio.amateur.homebrew Subject: Re: SPELLING PLEASE Date: Tue, 30 Jul 1996 01:26:57 GMT Organization: Netcom Lines: 49 Message-ID: <31fd5fa1.602127170@nntp.ix.netcom.com> References: <4t8quj$k9f@news2.h1.usa.pipeline.com> <4tah5s$7oe@nonews.col.hp.com> <4thl78$iog@ve7tcp.ampr.org> NNTP-Posting-Host: den-co22-06.ix.netcom.com X-NETCOM-Date: Mon Jul 29 6:25:38 PM PDT 1996 X-Newsreader: Forte Agent .99e/32.227 On 28 Jul 1996 23:20:24 -0700, lyndon@ve7tcp.ampr.org (Lyndon Nerenberg) wrote: >dmoorman@interaccess.com (Dave Moorman) writes: >> >>> I'm with you, Art. But may I point out that '73' means 'best regards' >>> That make the above 'best regards's' > >>The apostrophe is being used as it is after the plural of an acronym, such >>as TV's, CD's, etc., where it is appropriate. > >73 is not an acronym, it's a prosign (or macro). "73's" is by all >accounts incorrect usage. > >In this age of no-code licensing, why does anyone even care? > >--lyndon > > >-- > >Engage your brain before your mouth ... Having done the above, those of us that may not agree with the CW requirements do not, necessarily, want to trash all Amateur tradition. In my opinoin, CW is the modern equivilant of spark transmission. It has no use other than pure enjoyment of those who like it. This is OK. There is no longer ANY commercial or military usage of CW. There will sonn be too few amateurs left who can copy it for it to be of any use in an emergency. Why shove it down everyone's throat when only a few actually enjoy it? How many Gerneral, Advanced, or Extra Class hams are there that can copy even 5 wpm any more? Now that I have voiced my opinion, let me offer a solution. Keep the CW portions of the various bands for CW operators ONLY. Proficiency in CW must be demonstrated for thier usage. (An endorsement to the ticket perhaps?) Maintain the testing levels for the various classes of licences with stronger emphasis on theory, to replace the current code requirements. Add questions about operating courtesy (have you heard our glorified CB'ers on 20 meters recently?). This solution is not what everyone would like, but I think it is a reasonable compromise. Further discussion is welcome. 73, Kevin N0OAS/AAR8GF From amsoft@epix.net Thu Aug 01 21:22:45 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!arclight.uoregon.edu!usenet.eel.ufl.edu!spool.mu.edu!howland.reston.ans.net!agate!info.ucla.edu!zephyr!hansen From: hansen@ee.ucla.edu (Christopher J Hansen) Subject: digital radio receiver Sender: news@seas.ucla.edu (News Daemon) Message-ID: Date: Tue, 30 Jul 1996 02:28:52 GMT X-Nntp-Posting-Host: newton.ee.ucla.edu Organization: ucla X-Newsreader: TIN [version 1.2 PL2] Lines: 7 I am interested in designing a digital radio receiver. (Actually, an analog front end and digital IF and demod.) I'm looking for suggestions for an A/D converter - I'd like a 1 MHz sampling rate with 12-14 bits, 16 if possible. Thanks. Chris Hansen, KQ6DW From amsoft@epix.net Thu Aug 01 21:22:46 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sgi.com!spool.mu.edu!usenet.eel.ufl.edu!news-res.gsl.net!news.gsl.net!swrinde!cs.utexas.edu!bcm.tmc.edu!pendragon!news.msfc.nasa.gov!newsfeed.internetmci.com!newsreader.sprintlink.net!news.sprintlink.net!news-fw-22.sprintlink.net!southwind.net!usenet From: zclobes@southwind.net (Zack Clobes) Newsgroups: rec.radio.amateur.homebrew Subject: ARRL Radio Designer Date: 30 Jul 1996 04:55:32 GMT Organization: SouthWind Internet Access, Inc. Lines: 6 Message-ID: <4tk4k4$hlf@opal.southwind.net> NNTP-Posting-Host: hut6.southwind.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.6 Hi, I'm looking at purchasing the ARD to help in designing a homebrew 20M rig among other things. Any comments as to how acurrate, how difficult to use, ho w useful this software is? It'll be running under win 95 with 8 megs of ram an d a 486 dx2/66mhz machine. Thanks From amsoft@epix.net Thu Aug 01 21:22:47 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.cdsnet.net!news.magicnet.net!nntp.newsfirst.com!nntp.crosslink.net!news2.cais.net!news.cais.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.texas.net!news.kei.com!newsfeed.internetmci.com!newsreader.sprintlink.net!news.sprintlink.net!news-pen-4.sprintlink.net!southwind.net!usenet From: zclobes@southwind.net (Zack Clobes) Newsgroups: rec.radio.amateur.homebrew Subject: Help finding IC chip Date: 30 Jul 1996 05:00:47 GMT Organization: SouthWind Internet Access, Inc. Lines: 8 Message-ID: <4tk4tv$hlf@opal.southwind.net> NNTP-Posting-Host: hut6.southwind.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.6 Does anyone know where I can find an HSP45102PC-40 IC made by Harris Semiconductors. They call it a "12-bit numerically controlled oscillator IC." It basicially produces a digital sine wave to drive a DAC for DSS. Any help would be appriciated. Thanks. 73's de Zack, AA0XQ From amsoft@epix.net Thu Aug 01 21:22:50 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!arclight.uoregon.edu!usenet.eel.ufl.edu!spool.mu.edu!howland.reston.ans.net!EU.net!main.Germany.EU.net!fu-berlin.de!sunsystem5.informatik.tu-muenchen.de!lrz-muenchen.de!news.unibw-muenchen.de!bauv111!claude From: claude@bauv.unibw-muenchen.de (Claude Frantz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: AM Modulation with SS Amps. Date: 30 Jul 96 08:55:31 GMT Organization: University of the Federal Armed Forces Munich Lines: 28 Message-ID: References: <4t5fch$aqu@globe.indirect.com> <4t6m7t$cg9@newsbf02.news.aol.com> Reply-To: claude@bauv106.bauv.unibw-muenchen.de NNTP-Posting-Host: bauv111.bauv.unibw-muenchen.de X-Newsreader: NN version 6.5.0 #3 (NOV) w8jitom@aol.com (W8JI Tom) writes: >In article <4t5fch$aqu@globe.indirect.com>, jeffd@coriolis.com (Jeff >Duntemann) writes: >>I'm not sure what the governing physics is in this case. >>I would guess the audio response would be better but I'm not sure. >>Any thoughts there? >Audio response is limited by core eddy currents causing a loss of >permeability as frequency is raised, and by the winding method. Good audio >transformers have the windings interleaved, so flux losses are reduced and >coupling is improved. Is not the load of the class C PA an asymetrical load ? When the peak voltage of the PA reaches the double of the Va, the power is the quadruple. When the peak anode voltage go to zero, the power is zero too. Because the modulator is usually a push-pull circuit, the one of the output stage device will handle the high power half-wave, while the other device will handle the low-power half-wave. Which are the problems associated with this fact ? Can the load be equilized between the two output devices (tubes or SS devices) ? -- Claude (claude@bauv106.bauv.unibw-muenchen.de) The opinions expressed above represent those of the writer and not necessarily those of her employer. From amsoft@epix.net Thu Aug 01 21:22:51 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!nntp.primenet.com!newsfeeder.sdsu.edu!newspump.sol.net!spool.mu.edu!howland.reston.ans.net!quagga.ru.ac.za!und.ac.za!iafrica.com!aztec.co.za!workspc From: workshop@pcm.co.za (Workshop) Newsgroups: rec.radio.amateur.homebrew Subject: rf design problem? Date: 30 Jul 1996 11:06:26 GMT Organization: Professional Computer Manufacturers Lines: 13 Message-ID: <4tlf9j$2b4_004@pcm.co.za> NNTP-Posting-Host: workspc.pcm.co.za X-Newsreader: News Xpress Version 1.0 Beta #3 Hi there Is there anyone who can help me figure out a problem concerning a design that I have seen in a book.You will need to have the book to help me. The book is RF CIRCUIT DESIGN by CHRIS BOWICK. On page 159 there is a diagram and design of a 15W 100MHz amplifier. I understand the input and output matching that he has done,but where did he g et the 310 ohm resistor and the 1uH coil that are connected to the collector of t he transistor from.These are also in parallel with the output of the transistor and I would assume affect the matching network.These don't seem to have been taken into account. Any help appreciated Cheers Robin email : workshop@pcm.co.za From amsoft@epix.net Thu Aug 01 21:22:52 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!crawford.com!news.sprintlink.net!news-fw-6.sprintlink.net!news.inc.net!newspump.sol.net!spool.mu.edu!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!news.be.innet.net!INbe.net!news.nl.innet.net!INnl.net!hunter.premier.net!news.cais.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news1.best.com!nntp1.best.com!shellx.best.com!not-for-mail From: stevem@best.com (Stephen Muther) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 2m wx radio conversion Date: 30 Jul 1996 13:03:34 -0700 Organization: BEST Internet Communications Lines: 23 Message-ID: <4tlpqm$15j@shellx.best.com> References: <4tlog0$1a@herald.concentric.net> NNTP-Posting-Host: shellx.best.com In article <4tlog0$1a@herald.concentric.net>, Dave Harrison wrote: >I have an older Radio Shack weather radio. It's crystal controlled, and >it looks like it uses a single 16.202MHz crystal which I think is >multiplied 10, and has a single 455kHz if (i think). Can I just replace >the crystal to make a 2m rx? I just want a single frequency receiver that >I can do a dtmf decode on to launch high power rockets. (the safe distance >for some of the rockets we fly at our experimental launches is 1/2 mile to >1.5 miles, and yes do get FAA waivers, land owner permission, comply with >ATF rules...). Will I need to adjust coils/inductors? Any suggestions on >a crystal source? >Please reply here or to 150@westside.com This kind of operation might be considered as RC model control which, I believe, is only permitted on 6 meters with a 1W power restriction. The RX mod you propose would probably work ok for 2M. Those receivers are not very selective to begin with. You might not even have to tune the front end. Steve Muther WF6R From amsoft@epix.net Thu Aug 01 21:22:53 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!brighton.openmarket.com!decwrl!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Michael Tracy Newsgroups: rec.radio.amateur.homebrew Subject: Re: ARRL Radio Designer Date: 30 Jul 1996 14:29:40 GMT Organization: American Radio Relay League, Inc. Lines: 23 Message-ID: <4tl68k$cjn@mgate.arrl.org> References: <4tk4k4$hlf@opal.southwind.net> <31FDBC83.5EAE@crpl.cedar-rapids.lib.ia.us> NNTP-Posting-Host: mtracy.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) >Zack Clobes wrote: > > Hi, I'm looking at purchasing the ARD to help in designing a > homebrew 20M rig among other things. Any comments as to how > acurrate, how difficult to use, how useful this software is? Hi, I am the ARRL's software support person for the ARRL Radio Designer. If you (or anyone else) has specific questions about ARD's capabilities or specifications, please contact me by email (mtracy@arrl.org) or by telephone (860-594-0333) for answers to your questions. For general information on ARD, point your Web browser to: http://www.arrl.org/ard/ Best Regards, Michael Tracy, KC1SX, ARRL Technical Information Services ----------------------------------------------------------------------- American Radio Relay League, Inc. Tel: 1-860-594-0214 225 Main Street Fax: 1-860-594-0259 Newington, CT 06111 Email: mtracy@arrl.org (internet) ----------------------------------------------------------------------- From amsoft@epix.net Thu Aug 01 21:22:54 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news1.sunbelt.net!mel.hargray.com!imci4!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: AM Modulation with SS Amps. Message-ID: <1996Jul30.162822.16585@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4t5fch$aqu@globe.indirect.com> <4t6m7t$cg9@newsbf02.news.aol.com> Date: Tue, 30 Jul 1996 16:28:22 GMT Lines: 52 In article claude@bauv106.bauv.unibw-muenchen.de wr ites: >w8jitom@aol.com (W8JI Tom) writes: > >>In article <4t5fch$aqu@globe.indirect.com>, jeffd@coriolis.com (Jeff >>Duntemann) writes: > >>>I'm not sure what the governing physics is in this case. >>>I would guess the audio response would be better but I'm not sure. >>>Any thoughts there? > >>Audio response is limited by core eddy currents causing a loss of >>permeability as frequency is raised, and by the winding method. Good audio >>transformers have the windings interleaved, so flux losses are reduced and >>coupling is improved. > >Is not the load of the class C PA an asymetrical load ? When the peak >voltage of the PA reaches the double of the Va, the power is the quadruple. >When the peak anode voltage go to zero, the power is zero too. Because >the modulator is usually a push-pull circuit, the one of the output >stage device will handle the high power half-wave, while the other device >will handle the low-power half-wave. > >Which are the problems associated with this fact ? Can the load be >equilized between the two output devices (tubes or SS devices) ? It takes just as much modulator power to pull the output down as to push it up, so the loads on the modulator devices are equal. What isn't equal is the current in the secondary winding of the modulation transformer. On positive modulation peaks, it is high, as the modulator voltage adds to the PA power supply voltage, on negative modulation peaks it is low, as the PA power supply voltage is bucked by the modulator voltage. This can affect core saturation design values, but unless the modulation transformer is allowed to saturate (and it never should be allowed to saturate), the loads on the push pull modulator devices will remain balanced as they alternately buck and boost the PA power supply voltage (and hence modulate PA current). The fact that the PA is Class C, and asymmetric, is irrelevant because that's at RF frequency and not AF frequency. At AF, many many RF cycles pass for each AF cycle, so the load averages out on the timescale the modulator tubes see. The modulation transformer can be considered a smoothing choke to RF, so those pulses the Class C stage draws are smoothed to an average value as far as the modulator devices are concerned. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Thu Aug 01 21:22:55 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!news-dc-9.sprintlink.net!coopnews.coop.net!csnews!boulder!agate!howland.reston.ans.net!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!in2.uu.net!shore!news3.near.net!sol.caps.maine.edu!news From: baack@midcoast.com (Jason Baack) Newsgroups: rec.radio.amateur.homebrew Subject: Mod of the TRC-208 11M to 10M Help? Date: 30 Jul 1996 17:00:34 GMT Organization: University of Maine System Lines: 14 Message-ID: <4tlf3i$1hic@sol.caps.maine.edu> NNTP-Posting-Host: dali.umecut.maine.edu Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Hello all, I happen to stumble upon some of these OLD CB HT's for CB. (Radio Shack TRC-208 /4 channels, hi/low power BIG telescoping antenna...) Understanding that these units are transmitting in AM, how difficult would it be to convert to 10M am.? Any help would be great. Jason N1RWY http://www.umecut.maine.edu/~baack (ham radio meets Applachian Trial hiking) baack@maine.maine.edu From amsoft@epix.net Thu Aug 01 21:22:56 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!spool.mu.edu!news.sgi.com!nntp.coast.net!news.kei.com!news.texas.net!newsfeed.concentric.net!news-master!mariner.cris.com!Davew From: Davew@cris.com (Dave Harrison) Newsgroups: rec.radio.amateur.homebrew Subject: 2m wx radio conversion Date: 30 Jul 1996 19:40:48 GMT Organization: Concentric Internet Services Lines: 10 Message-ID: <4tlog0$1a@herald.concentric.net> NNTP-Posting-Host: mariner.cris.com X-Newsreader: TIN [version 1.2 PL2] I have an older Radio Shack weather radio. It's crystal controlled, and it looks like it uses a single 16.202MHz crystal which I think is multiplied 10, and has a single 455kHz if (i think). Can I just replace the crystal to make a 2m rx? I just want a single frequency receiver that I can do a dtmf decode on to launch high power rockets. (the safe distance for some of the rockets we fly at our experimental launches is 1/2 mile to 1.5 miles, and yes do get FAA waivers, land owner permission, comply with ATF rules...). Will I need to adjust coils/inductors? Any suggestions on a crystal source? Please reply here or to 150@westside.com From amsoft@epix.net Thu Aug 01 21:22:57 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!crawford.com!news.sprintlink.net!news-fw-6.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.sgi.com!news.msfc.nasa.gov!newsfeed.internetmci.com!news.kei.com!news.texas.net!nntp04.primenet.com!news.shkoo.com!nntp.primenet.com!news.cais.net!news2.whytel.com!usenet From: Aubrey Hawkins Newsgroups: rec.radio.amateur.homebrew Subject: ?: 49MHZ MOD Date: Tue, 30 Jul 1996 22:28:53 -0700 Organization: Why? Network (817) 795-1765 Lines: 12 Message-ID: <31FEEF15.6F8B@why.net> NNTP-Posting-Host: 38.ann1.dal.why.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win16; U) I have heard that there is a mod around that converts the 49 MHZ talkies that radio shack puts to have them work on 6m. Has anyone heard of this.. I heard that you have to change some xtals. Any help would be appreciated. 73s, Aubrey Hawkins KC5USI Dallas From amsoft@epix.net Thu Aug 01 21:22:58 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!wagner.spc.videotron.ca!clicnet!news.clic.net!rcogate.rco.qc.ca!n2ott.istar!ott.istar!istar.net!van.istar!west.istar!uniserve!news.sol.net!newspump.sol.net!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!usenet From: Frank Dinger Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help SB-300 S meter/AGC Date: Wed, 31 Jul 1996 00:06:41 +0100 Lines: 19 Message-ID: <1996073100064170432@zetnet.co.uk> References: <4t9h17$opn@nadine.teleport.com> NNTP-Posting-Host: piccadilly.zetnet.co.uk X-Mailer: ZIMACS Version 1.09u 10001740 In message <4t9h17$opn@nadine.teleport.com> lroland@teleport.com (Roland) writes: > Thanks for reading..... I have and SB-300 with a problem in the AGC > circuit or S meter circuit. With AGC off I get little or no reading > in the S meter. Switching in the AGC in either fast or slow restores > the S meter but degrades signal quality. Any ideas? Radio works ok > otherwise, tubes test ok and voltages are in the ballpark. Thanks. > /John WB7SWB E-mail lroland@teleport.com > Packet WB7SWB@W0RLI John ,An S-meter circuit usually derives its signal from the AGC in any superhet (but for professional rx) .This means that when you switch off AGC your S-meter will no longer respond or hardly respond. Frank Dinger , Inver by Tain , Ross-shire - Scotland UK e-mail : gm0csz.kn6wh@ukrs.org Packet : GM0CSZ @ GB7NOS.#76.GBR.EU From amsoft@epix.net Thu Aug 01 21:22:59 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-fw-6.sprintlink.net!news.inc.net!newspump.sol.net!chi-news.cic.net!cs.utexas.edu!swrinde!howland.reston.ans.net!nntp.coast.net!news.kei.com!news.texas.net!nntp.primenet.com!newsfeeder.sdsu.edu!in-news.erinet.com!bug.rahul.net!rahul.net!a2i!samba.rahul.net!rahul.net!a2i!olivea!charnel.ecst.csuchico.edu!waldorf.csc.calpoly.edu!isnews.csc.calpoly.edu!hertz.elee.calpoly.edu!ceustaqu From: Cal Eustaquio Newsgroups: rec.radio.amateur.homebrew Subject: Need help with silkscreen/DATAK labels Date: Wed, 31 Jul 1996 06:19:00 -0700 Organization: Cal Poly, San Luis Obispo Lines: 5 Message-ID: NNTP-Posting-User: ceustaqu@hertz.elee.calpoly.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Does anyone know of a good method of duplicating old radio logos with custom DATAK-type labels? I want to avoid silkscreening and heard there exists a manufacturer or business who can take your design and turn it into a DATAK (rub on lettering) type of medium. I appreciate all suggestions and info on this querie. Cal. From amsoft@epix.net Thu Aug 01 21:23:00 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!crawford.com!news.sprintlink.net!news-fw-6.sprintlink.net!newsfeed.telalink.net!telalink!news.wildstar.net!news.ecn.uoknor.edu!munnari.OZ.AU!harbinger.cc.monash.edu.au!nntp.coast.net!swidir.switch.ch!01-newsfeed.univie.ac.at!Austria.EU.net!EU.net!newsfeed.internetmci.com!athos.itribe.net!global.gc.net!sourcebbs!bob.roach From: bob.roach@sourcebbs.com (BOB ROACH) Newsgroups: rec.radio.amateur.homebrew Subject: Re: SPELLING PLEASE Message-ID: <8C582BE.0367000787.uuout@sourcebbs.com> Date: Wed, 31 Jul 96 11:42:00 -0500 Distribution: world Organization: SelectiveSourceBBS VirginiaBeach (804)471 6776 Reply-To: bob.roach@sourcebbs.com (BOB ROACH) References: <31fd5fa1.602127170@nntp.ix.netcom.com> X-Newsreader: PCBoard Version 15.3 X-Mailer: PCBoard/UUOUT Version 1.30 Lines: 17 >-OK. There is no longer ANY commercial or military usage of CW. There >-will sonn be too few amateurs left who can copy it for it to be of any >-use in an emergency. Why shove it down everyone's throat when only a They'll be around as long as they want HF privileges. 73 de KE4QOK Bob * SLMR 2.1a * 666bps - communication rate of the beast --- This message originated from: ---------- Selective Source BBS ------- Virginia Beach, Virginia ----- (804) 471 6776 From amsoft@epix.net Thu Aug 01 21:23:01 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!guitar.sound.net!imci5!pull-feed.internetmci.com!newsfeed.internetmci.com!ncar!uchinews!cbgw2.att.com!nntphub.cb.lucent.com!news From: Sheldon Darack Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: Re: "Y" adapter Date: Wed, 31 Jul 1996 12:41:45 -0400 Organization: Lucent Technologies, Columbus, Ohio Lines: 18 Message-ID: <31FF8CC9.6F95@fuwutai.lucent.com> References: <4tnm7o$ur6@nw101.infi.net> NNTP-Posting-Host: pcshel.wh.lucent.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.01 (Win95; I) To: Scott Ryan Xref: news2.epix.net rec.radio.amateur.homebrew:16300 rec.radio.amateur.equipment:31428 Sounds fine. You need two mono plugs (one for each radio) and one stereo jack. Also two lengths of two conductor speaker wire. Connect the grounds together at the stereo jack. Audio from one mono plug goes to the stereo jack "tip". Audio from the other mono plug goes to the stereo jack "ring". Enjoy, Shel WA2UBK Scott Ryan wrote: > > I'm looking to purchase or build a "Y" adapter that will allow me to > connect the mono audio out (headphone, 1/8") from a scanner and a SW > receiver to one stereo headset. > > My thought is to connect the SW receiver to the left channel of the > headset and the scanner to the right channel, so as to listen to both > audio's at once. Will this create any negative effects (feedback, etc.) > to the headset or the receivers? From amsoft@epix.net Thu Aug 01 21:23:04 1996 Newsgroups: rec.radio.amateur.homebrew Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.sprintlink.net!news-dc-5.sprintlink.net!news.sprintlink.net!new-news.sprintlink.net!news.sgi.com!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: 2m wx radio conversion Message-ID: <1996Jul31.144010.21837@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4tlog0$1a@herald.concentric.net> Date: Wed, 31 Jul 1996 14:40:10 GMT Lines: 26 In article <4tlog0$1a@herald.concentric.net> Davew@cris.com (Dave Harrison) wr ites: >I have an older Radio Shack weather radio. It's crystal controlled, and >it looks like it uses a single 16.202MHz crystal which I think is >multiplied 10, and has a single 455kHz if (i think). Can I just replace >the crystal to make a 2m rx? I just want a single frequency receiver that >I can do a dtmf decode on to launch high power rockets. (the safe distance >for some of the rockets we fly at our experimental launches is 1/2 mile to >1.5 miles, and yes do get FAA waivers, land owner permission, comply with >ATF rules...). Will I need to adjust coils/inductors? Any suggestions on >a crystal source? Yes, you'll need to modify the front end inductorsi (add turns). They won't come all the way down to 2m with just tweaking. (Alternately, you can add padder capacitance to bring the radio down in frequency.) The radio isn't very high performance, of course. Nor is it even slightly secure. I'd want something a bit better to control pyrotechnics. At the very least I'd require CTCSS on the link so that Joe HT won't inadvertently fire the thing while you're hooking it up. Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From amsoft@epix.net Thu Aug 01 21:23:05 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeed.telalink.net!telalink!news.wildstar.net!news.ecn.uoknor.edu!qns3.qns.net!imci4!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!dispatch.news.demon.net!demon!mail2news.demon.co.uk!lfheller.demon.co.uk From: Leon Heller Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: Re: "Y" adapter Date: Wed, 31 Jul 96 16:51:07 GMT Organization: Home Lines: 21 Message-ID: <838831867snz@lfheller.demon.co.uk> References: <4tnm7o$ur6@nw101.infi.net> Reply-To: Leon@lfheller.demon.co.uk X-NNTP-Posting-Host: lfheller.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 X-Mail2News-Path: lfheller.demon.co.uk Xref: news2.epix.net rec.radio.amateur.homebrew:16302 rec.radio.amateur.equipment:31431 In article <4tnm7o$ur6@nw101.infi.net> crtoy@fyiowa.infi.net "Scott Ryan" writ es: > I'm looking to purchase or build a "Y" adapter that will allow me to > connect the mono audio out (headphone, 1/8") from a scanner and a SW > receiver to one stereo headset. > > My thought is to connect the SW receiver to the left channel of the > headset and the scanner to the right channel, so as to listen to both > audio's at once. Will this create any negative effects (feedback, etc.) > to the headset or the receivers? Some military radio users do this sort of thing all the time, without any problems. They also have a switch which enables them to transmit on either of the nets they are monitoring. Leon -- Leon Heller, G1HSM | "Do not adjust your mind, there is E-mail leon@lfheller.demon.co.uk | a fault in reality": on a wall Phone: +44 (0)1734 471424 | many years ago in Oxford. From amsoft@epix.net Thu Aug 01 21:23:06 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!crawford.com!news.sprintlink.net!news-fw-6.sprintlink.net!newsfeed.telalink.net!telalink!news.wildstar.net!news.ecn.uoknor.edu!news.uoknor.edu!news.nodak.edu!netnews3.nwnet.net!netnews.nwnet.net!news.u.washington.edu!uw-beaver!nntp.cs.ubc.ca!unixg.ubc.ca!info.ucla.edu!agate!howland.reston.ans.net!swrinde!news-res.gsl.net!news.gsl.net!hunter.premier.net!netnews.worldnet.att.net!cbgw2.att.com!news.bu.edu!transfer.stratus.com!news3.near.net!news.ner.bbnplanet.net!news.analog.com!telcom-admin From: DD2KO <101503,2417@Compuserve> Newsgroups: rec.radio.amateur.homebrew Subject: HP3746A Manual Date: 31 Jul 1996 17:19:59 GMT Organization: analog.com Lines: 3 Message-ID: <4to4jv$p7r@nwd2nws1.analog.com> NNTP-Posting-Host: 137.71.23.3 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2 (Windows; U; 16bit) Anyone able to help with Schematics or Manual of HP3746A Selective Level Meter . DD2KO Compuserve 101503,2417. Thanks and VY 73. From amsoft@epix.net Thu Aug 01 21:23:07 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!news.mathworks.com!newsfeed.internetmci.com!newsfeed.direct.ca!nntp.teleport.com!ip-pdx10-55 From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna,rec.radio.amateur.equipment,sci.electronics.repair,sci.electronics.equipment,sci.electronics.design,sci.electronics.misc Subject: Re: High and low Frequence Antannas Date: Wed, 31 Jul 96 18:35:34 GMT Organization: EZNEC Antenna Software Lines: 19 Message-ID: <4to8vk$cos@nadine.teleport.com> References: <31F72D1D.17D@mailhost.oxford.net> <4tar39$ec@viking.mpr.ca> <31FA79CA.955@interlog.com> NNTP-Posting-Host: ip-pdx10-55.teleport.com X-Newsreader: News Xpress Version 1.0 Beta #3 Xref: news2.epix.net rec.radio.amateur.homebrew:16301 rec.radio.amateur.antenna:23472 rec.radio.amateur.equipment:31429 sci.electronics.repair:30186 sci.electronics.equipment:4258 sci.electronics.design:10380 sci.electronics.misc:8221 In article , "'Cel' M. Mallary" wrote: >Reminds me of a Navy instructor who when asked the same question about a >Yagi, raised his eyebrows and dryly said " pretty good." 'Course the same >guy, >a day or two before, enlightened us about the "1/4 wave ground plane" or >the "Marconi whip" antenna. Seems Marconi had been working through a >summer draught trying to prove a base fed 1/4 wave rod with it's insulated >base stuck in the ground, would produce a nice 360 deg. toroidal radiation >pattern. After a fruitless few days, Marconi threw up is hands and said >"Aww piss on it". Well one of his grunts did just that and all of a >sudden the antenna started working. And that's the honest to gosh >beginning of all those little 1/4 wave whips you see on cars nowdays. > ( (-:jm:-) ) So that's what a pissant is. Roy Lewallen, W7EL From amsoft@epix.net Thu Aug 01 21:23:08 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!usenet.kornet.nm.kr!news.postech.ac.kr!news.kreonet.re.kr!news.dacom.co.kr!arclight.uoregon.edu!usenet.eel.ufl.edu!spool.mu.edu!munnari.OZ.AU!news.mel.connect.com.au!harbinger.cc.monash.edu.au!nntp.coast.net!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Christina Craft <103732.2211@CompuServe.COM> Newsgroups: in.ham-radio,ott.events,ott.general,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Any cool amateur radio online? Date: 31 Jul 1996 21:04:52 GMT Organization: christinac@corel.com Lines: 20 Message-ID: <4tohpk$89s$2@mhafc.production.compuserve.com> Xref: news2.epix.net in.ham-radio:253 ott.events:6336 ott.general:26342 rec.radio.amateur.equipment:31436 rec.radio.amateur.homebrew:16303 I've been looking endlessly for some cool amateur radio broadcasts (preferably live stuff) on the net. I realize the technology is still fairly expensive so it's hard for people to broadcast on RealAudio or Streamworks but I'm interested in hearing some stuff out there. If you know of places where I can find this kind of live broadcast I'd really appreciate being pointed to it. I've done countless searches and must be putting in the wrong key words. Is anyone out there doing some amateur stuff or is it mostly the mainstream doing online live broadcasts? Your help is appreciated email to ao349@freenet.carleton.ca Cheers! From amsoft@epix.net Thu Aug 01 21:23:11 1996 Path: news2.epix.net!news.sprintlink.net!news-dc-2.sprintlink.net!newsfeeder.servtech.com!news1.io.org!winternet.com!n1ott.istar!ott.istar!istar.net!van.istar!west.istar!uniserve!news.sol.net!newspump.sol.net!chi-news.cic.net!nntp.coast.net!news.sgi.com!swrinde!howland.reston.ans.net!ixnews1.ix.netcom.com!ix.netcom.com!ix.netcom.com!news From: gsparks@ix.netcom.com(Glenn Sparks) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: Re: "Y" adapter Date: 31 Jul 1996 21:31:02 GMT Organization: Netcom Lines: 30 Message-ID: <4tojam$2k0@dfw-ixnews10.ix.netcom.com> References: <4tnm7o$ur6@nw101.infi.net> <31FF8CC9.6F95@fuwutai.lucent.com> NNTP-Posting-Host: hou-tx9-10.ix.netcom.com X-NETCOM-Date: Wed Jul 31 4:31:02 PM CDT 1996 Xref: news2.epix.net rec.radio.amateur.homebrew:16304 rec.radio.amateur.equipment:31440 In n1ist@netcom.com (Michael L. Ardai) writes: > >In article <31FF8CC9.6F95@fuwutai.lucent.com> Sheldon Darack writes: >-Sounds fine. You need two mono plugs (one for each radio) and one stereo >-jack. Also two lengths of two conductor speaker wire. Connect the >-grounds together at the stereo jack. Audio from one mono plug goes to >-the stereo jack "tip". Audio from the other mono plug goes to the stereo >-jack "ring". > >Just keep in mind that this will create a common ground connection between >the two radios. Usually it's not a problem, but may be in certain setups. >/mike >-- >\|/ Michael L. Ardai N1IST n1ist@netcom.com \|/ >-*- === Boston Amateur Radio Club: http://www.barc.org/barc === -*- >/|\ or send "info barc-list" to listserv@netcom.com /|\ You may it also find it will drive you crazy, I tried a setup like this for a while and couldn't handle it. I always intended to build something that would sense the audio level and break in when something was coming from the non-priority set. Sparky KI5GY