The World of Ham Radio CD-ROM From lwbyppp@epix.net Mon Feb 05 21:42:22 1996 Path: news.epix.net!news.sprintlink.net!news.icanect.net!news From: Eliot Fenton Newsgroups: rec.radio.amateur.homebrew Subject: Re: Stereo xmitter chip? Date: Thu, 01 Feb 1996 01:38:19 -0800 Organization: Internet Communications of America Lines: 12 Message-ID: <31108A0B.4DAE@alice.icanect.net> References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> NNTP-Posting-Host: ascend-189.icanect.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6b (Win16; I) > There is a chip that does what you want. Sorry, can't think of the > manufacturer. Ramsey sells two complete kits that uses it and does what you > want. I've seen the chip sold separatly but can't find a listing in a catalo g > just for the chip at the present time. Drew: Thanks for the reply. I've heard of Ramsey, but have never bought from them. Do you have a phone number so I contact them? Eliot Fenton ics@icanect.net From lwbyppp@epix.net Mon Feb 05 21:42:23 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!miwok!usenet From: Gary Davidson Newsgroups: rec.radio.amateur.homebrew Subject: NEED CENTRAL ELECTRONICS 20-A COMPONENTS Date: 1 Feb 1996 01:53:34 GMT Organization: North Bay Network, Inc. news server - not responsible for content Lines: 7 Message-ID: <4ep6eu$lrc@miwok.nbn.com> NNTP-Posting-Host: castles19.castles.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2 (Windows; U; 16bit) I need the VFO for a CE 20-a, a very professional grade, 10 meter capable unit, please, and also the plug-in antitrip module - sure would like to get this rig back on the air! Gary, KJ6Q, KJ6Q@WA6HAM (packet) design@thereporter.com, or 707-448-5221. Vacaville, ca. From lwbyppp@epix.net Mon Feb 05 21:42:24 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!hookup!gatech!newsfeed.internetmci.com!in2.uu.net!prodigy.com!usenet From: JLAN98A@prodigy.com (Kenneth Burtchaell) Newsgroups: rec.radio.amateur.homebrew Subject: Printer generated transparency problem Date: 1 Feb 1996 02:13:04 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 7 Distribution: world Message-ID: <4ep7jg$326k@useneta1.news.prodigy.com> NNTP-Posting-Host: inugap3.news.prodigy.com X-Newsreader: Version 1.2 I am experiecing difficulty in getting a good solid blackening in the solid trace areas of PCB layout transparencies on my Okidata OL400 printer.It has been suggested to me that this might be a electro static induced problem . Anybody have any good ideas? 73 Ken W6GHV From lwbyppp@epix.net Mon Feb 05 21:42:25 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: TA7204 audio amp chip Date: Thu, 01 Feb 96 03:21:54 GMT Lines: 18 Message-ID: <823188902.23383@pinetree.microserve.com> References: <4eqh0o$tg9@netnews.upenn.edu> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 Jaggi@cvrc.med.upenn.edu (Jurg L. Jaggi) wrote: >I recently got a Kyokuto FM144-10SXRII radio. Unfortunately, the audio >amplifier chip is defective and needs to be replaced. It is labelled >TA7204. The TA7204 is a common audio amplifier IC used in many types of Japanese audio equipment, particularly automobile stereos. The chip is still available, listed for sale at $10.44 from MCM Electronics. MCM has a $20.00 minimum order, but will ship smaller orders with a $5.00 service fee. Their phone for orders is (800) 543-4330. Alternately, you might also try a few local stereo repair shops to see if any of them stock this part. 73, Jack WB3U From lwbyppp@epix.net Mon Feb 05 21:42:26 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!taebaek.nowcom.co.kr!imci3!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!ferengi.prismnet.com!usenet From: rew5808 Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: WTB: lafayette, allied electronics & heathkit catalogs Date: 1 Feb 1996 05:12:37 GMT Organization: PrismNet - (512)-418-1568 Lines: 7 Message-ID: <4epi45$d2r@ferengi.prismnet.com> References: <4ehl14$sep@crl11.crl.com> NNTP-Posting-Host: ip-1-14.reallink.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Xref: news.epix.net rec.radio.shortwave:69533 rec.radio.amateur.antenna:18802 rec.radio.amateur.equipment:24425 rec.radio.amateur.misc:97589 rec.radio.amateur.homebrew:13069 I am looking for some lafayette radio, allied electronics, and heathkit catalogs from 1957 thru 1965. would appreciate any help and/or any leads you can give me. thanks bobby wb5wur From lwbyppp@epix.net Mon Feb 05 21:42:27 1996 Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!uunet!in2.uu.net!ferengi.prismnet.com!usenet From: rew5808 Newsgroups: rec.radio.amateur.swap,rec.radio.amateur.misc,rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Re: WTB: lafayette, allied electronics & heathkit catalogs Date: 1 Feb 1996 05:51:45 GMT Organization: PrismNet - (512)-418-1568 Lines: 9 Message-ID: <4epkdh$d8v@ferengi.prismnet.com> References: <4ehl14$sep@crl11.crl.com> <4epi45$d2r@ferengi.prismnet.com> NNTP-Posting-Host: ip-1-14.reallink.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Xref: news.epix.net rec.radio.amateur.misc:97615 rec.radio.shortwave:69565 rec.radio.amateur.antenna:18825 rec.radio.amateur.equipment:24451 rec.radio.amateur.homebrew:13080 I am looking for some lafayette radio, allied electronics, and heathkit catalogs from 1957 thru 1965. would appreciate any help and/or any leads you can give me. thanks bobby wb5wur From lwbyppp@epix.net Mon Feb 05 21:42:27 1996 Path: news.epix.net!news.sprintlink.net!news.comm.net!imci3!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!ferengi.prismnet.com!usenet From: rew5808 Newsgroups: rec.radio.swap,rec.radio.amateur.antenna,equipment,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: wtb: allied, lafayette, heathkit catalogs Date: 1 Feb 1996 06:06:59 GMT Organization: PrismNet - (512)-418-1568 Lines: 7 Message-ID: <4epla3$dd5@ferengi.prismnet.com> NNTP-Posting-Host: ip-1-14.reallink.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Xref: news.epix.net rec.radio.swap:56499 rec.radio.amateur.antenna:18793 rec.radio.amateur.misc:97578 rec.radio.amateur.homebrew:13062 i would appreciate any help i can get in locating some spare lafayette radio/electronics, heathkit, or allied electronics catalogs from 1957 thru 1965. thanks bobby wb5wur From lwbyppp@epix.net Mon Feb 05 21:42:29 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usr7ip51.azstarnet.com!n7ws From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: Thu, 1 Feb 1996 07:03:19 LOCAL Organization: Arizona Daily Star - AZSTARNET Lines: 30 Distribution: world Message-ID: References: <4enu4k$gom@crash.microserve.net> <4eqdr2$pjm@cc.iu.net> NNTP-Posting-Host: usr7ip51.azstarnet.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #4] In article <4eqdr2$pjm@cc.iu.net> blombard@bb.iu.net (Bob Lombardi) writes: >From: blombard@bb.iu.net (Bob Lombardi) >Subject: Re: PTO Temperature Compensation >Date: 1 Feb 1996 13:05:38 GMT >WB3U (jackl@pinetree.microserve.com) wrote: >: I have four identical PTO's in solid-state rigs that I've been trying >: to stabilize, with only limited success. Maybe someone with more >: experience in this area can help me with this. [snip] >Perhaps someone in the crystal business will tell you how they make a >TCXO, but the basic process is to match the exact crystal variation >over temp with an inverse variation in the circuit. You can tune a >varactor across the crystal with thermistors. The same approach may >work for you. You have to test the oscillator over temperature and >find out how much it drifts, then figure how much C you need to pull >it in, what voltage to drop in thermistors, etc., etc.. To do this >productively, like at a crystal oscillator house, you need to have >experience, good measurement equipment and probably curve-fitting >software (I'd guess). Jack a good reference on this is: Crystal Oscillator Design and Temperature Compensation" by M. E. Frerking. The subject is also mentioned in: "Single Sideband Systems & Circuits", Bill Sabin, Editor. 73, Wes -- N7WS From lwbyppp@epix.net Mon Feb 05 21:42:30 1996 Path: news.epix.net!news.sprintlink.net!bison.alfred.edu!kato.theramp.net!chi-news.cic.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!news.uoregon.edu!news.u.washington.edu!uw-beaver!uw-coco!nwnews.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: Printer generated transparency problem Date: Thu, 01 Feb 96 09:14:25 PDT Organization: Northwest Nexus Inc. Lines: 23 Message-ID: References: <4ep7jg$326k@useneta1.news.prodigy.com> NNTP-Posting-Host: blv-pm0-ip28.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage In article <4ep7jg$326k@useneta1.news.prodigy.com>, writes: > I am experiecing difficulty in getting a good solid blackening in the > solid trace areas of PCB layout transparencies on my Okidata OL400 > printer.It has been suggested to me that this might be a electro static > induced problem . Anybody have any good ideas? > > 73 Ken W6GHV Hi Ken, well that is certainly an interesting problem. I hope you get some help with it and post it to the group. I've had the same problem with my HP Laserjet IIP using one of the films sold for that purpose. I eventually gave up because the traces always ended up badly pitted from all the little pinholes. 73 de KI7RH From lwbyppp@epix.net Mon Feb 05 21:42:31 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!lll-winken.llnl.gov!enews.sgi.com!ames!waikato!news From: spearce@ccu1.auckland.ac.nz Newsgroups: rec.radio.amateur.homebrew Subject: rf circuit simulation Date: 1 Feb 1996 09:48:16 GMT Organization: The University of Waikato Lines: 6 Message-ID: <4eq290$r3a@thebes.waikato.ac.nz> NNTP-Posting-Host: 166.83.104.17 X-Newsreader: AIR News 3.X (SPRY, Inc.) Are the spice rf models available in the public domain What else is available freely for simulation of rf circuit designs? Thanks From lwbyppp@epix.net Mon Feb 05 21:42:32 1996 Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!usenet.eel.ufl.edu!tank.news.pipex.net!pipex!oleane!jussieu.fr!citi2.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!newshost.vu.nl!cs.vu.nl!sun4nl!rnzll3!sys3.pe1chl!rob From: rob@pe1chl.ampr.org (Rob Janssen) Subject: Re: 82 Repeater in Kansas City/Repeater Use Reply-To: pe1chl@wab-tis.rabobank.nl Organization: PE1CHL Message-ID: References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> <4elgqo$q73@nnrp1.news.primenet.com> Date: Thu, 1 Feb 1996 10:20:31 GMT Lines: 45 Xref: news.epix.net rec.radio.amateur.policy:32990 rec.radio.amateur.antenna:18873 rec.radio.amateur.equipment:24534 rec.radio.amateur.homebrew:13113 rec.radio.amateur.digital.misc:13948 In <4elgqo$q73@nnrp1.news.primenet.com> sparkfel@primenet.com (Mark Fellhauer) writes: >rob@pe1chl.ampr.org (Rob Janssen) wrote: >>In <310B8C36.5D9@magnum.wpe.com> Eddie Caffray wri tes: >>> On the 146.85 repeater here in Central NY we had trouble with one user als o. He made it that >>>no one would even monitor the reapeater anymore. The club voted to ban him and we did. The >>>reapeater is a great place to be again. >>How do you manage to effectively ban malicious users from a repeater? >>Of course this problem is known all over the world, but at least over >>here we have not yet found an effective way of stopping them. How do >>you do that? >Go to the Arizona Repeater Association's Home Page to see how this is >done. It involves actively pursuing people who engage in such >activity. The ARA, as a matter of routine, has an interference >committee dedicated to tracking these people down. >Despite reports to the contrary, the FCC does frown on this activity, >and will enforce sanctions. Just ask the people here in Phoenix about >that. An NAL, Notice of Apparant Liability, carries a stiff monetary >fine, about $20,000 (US) worth and forfeiture of ALL broadcasting >equipment and license(s). Hmmm... it looks like HDTP (or equivalent of the FCC) does not put out such drastic sanctions. Normally one will lose the license for a year or so, and one could get a fine of maybe $500. This does not seem to stop some people... when you have been reading the BBSes, you can see that the wellknown person that causes havoc on the local packet network is still active. He is fully known by name, ex-callsign, and address. (he just uses callsigns of other people, mainly VERON officials, to post offensive messages. he was also active on the phone repeater sometime, transmitting over those same people, but I think he has lost interest in that) Rob -- +------------------------------------+--------------------------------------+ | Rob Janssen rob@knoware.nl | BBS: +31-302870036 (2300-0730 local) | | AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU | +------------------------------------+--------------------------------------+ From lwbyppp@epix.net Mon Feb 05 21:42:34 1996 Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!swrinde!tank.news.pipex.net!pipex!oleane!jussieu.fr!citi2.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!newshost.vu.nl!cs.vu.nl!sun4nl!rnzll3!sys3.pe1chl!rob From: rob@pe1chl.ampr.org (Rob Janssen) Subject: Re: 82 Repeater in Kansas City Reply-To: pe1chl@wab-tis.rabobank.nl Organization: PE1CHL Message-ID: References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> Date: Thu, 1 Feb 1996 10:22:49 GMT Lines: 23 Xref: news.epix.net rec.radio.amateur.policy:32994 rec.radio.amateur.antenna:18882 rec.radio.amateur.equipment:24545 rec.radio.amateur.homebrew:13120 rec.radio.amateur.digital.misc:13951 In dbaker@mail.bcpl.lib.md.us (Donald I. Baker) writes: >Technical solutions do exist. Using a "TX-ID" board, which uniquely >fingerprints each transmitter and a PC one can "slectively" include or >preclude individual users. >The board was not meant for that purpose, but with just a little Basic of C >codes, it workd just fine. It is especially easy if you have a single or >limited number of receive site. Is that using some public key encryption technique? If not, what is preventing the malicious from cloning one of the apparently valid codes? Also, what is preventing the malicious user from just keying up over other people's transmissions, thus rendering the repeater useless? Rob -- +------------------------------------+--------------------------------------+ | Rob Janssen rob@knoware.nl | BBS: +31-302870036 (2300-0730 local) | | AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU | +------------------------------------+--------------------------------------+ From lwbyppp@epix.net Mon Feb 05 21:42:35 1996 Path: news.epix.net!news.sprintlink.net!news-res.gsl.net!news-dc.gsl.net!news-lond.gsl.net!Tagada.grolier.fr!rain.fr!jussieu.fr!math.ohio-state.edu!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!panix!not-for-mail From: schuster@panix.com (Michael Schuster) Newsgroups: rec.radio.amateur.homebrew,rec.radio.scanner Subject: Re: need 10 to 150 khz FM demodulator Date: 1 Feb 1996 11:10:09 -0500 Organization: panix Lines: 18 Message-ID: <4eqol1$2g1@panix3.panix.com> References: <4eomvr$mbf@freenet3.scri.fsu.edu> NNTP-Posting-Host: panix3.panix.com Xref: news.epix.net rec.radio.amateur.homebrew:13077 rec.radio.scanner:44848 In article <4eomvr$mbf@freenet3.scri.fsu.edu>, Bruce M. Marshall wrote: >Does anyone know of a chip that is used to demodulate multiplexed >signals such as FM sterio, secondary audio programming (SAP) on TV >sound and SCA on FM broadcast? I thought I could use my HF radio in FM >mode but I tried it and it didn't work. I finally figured out that >although the readout goes down to 0 hz it actually won't receive >anything less than 150 khz (the manual says so and I can hear the >relay click out.) >I'm sure there is a small, easy circuit to do this. Get a VLF converter, such as the ones made by Datong or Palomar Engineers, and put it in the antenna path. -- Mike Schuster | schuster@panix.com | 70346.1745@CompuServe.COM ------------------- | schuster@shell.portal.com | schuster@mem.po.com From lwbyppp@epix.net Mon Feb 05 21:42:37 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!spool.mu.edu!agate!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 4CX1600B Amp. Date: 1 Feb 1996 11:32:54 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 4 Sender: root@newsbf02.news.aol.com Message-ID: <4eqpvm$m40@newsbf02.news.aol.com> References: <4eqj7f$98k@kocrsv08.delcoelect.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader I have some questions. Does this circuit contain screen protection and voltage regulation in the screen and control grid? 73 Tom From lwbyppp@epix.net Mon Feb 05 21:42:38 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!news.mathworks.com!news.kei.com!nntp.coast.net!oleane!jussieu.fr!rain.fr!world-net!usenet From: opworld@worlnet.fr Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MIL VCO Date: Thu, 01 Feb 1996 12:31:49 GMT Organization: World-Net information exchange, Internet provider. Lines: 14 Message-ID: <4eqc3a$9h7@aldebaran.sct.fr> References: <4el6f3$r7h@aldebaran.sct.fr> NNTP-Posting-Host: client56.sct.fr X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net sci.electronics.components:1805 rec.radio.amateur.homebrew:13070 Hi Jon > Avantek was acquired by Hewlett Packard. You can still get an catalog of > the Avantek products, but you'll have to contact HP for it. Thanks for answer. I will try to get the right entry to HP because when I called HP, here in France, I found only informatic division and they don't know other division ! Have a nice opworld@worldnet.fr Day From lwbyppp@epix.net Mon Feb 05 21:42:40 1996 Path: news.epix.net!news.sprintlink.net!cc.iu.net!bb.iu.net!blombard From: blombard@bb.iu.net (Bob Lombardi) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: 1 Feb 1996 13:05:38 GMT Organization: InternetU, Inc., Palm Bay, FL Lines: 77 Distribution: world Message-ID: <4eqdr2$pjm@cc.iu.net> References: <4enu4k$gom@crash.microserve.net> NNTP-Posting-Host: bb.iu.net X-Newsreader: TIN [version 1.2 PL2] WB3U (jackl@pinetree.microserve.com) wrote: : I have four identical PTO's in solid-state rigs that I've been trying : to stabilize, with only limited success. Maybe someone with more : experience in this area can help me with this. I have some experience with this, so perhaps I can help a little. : First, the oscillator is a JFET in the usual Colpitts configuration, : operating from 5.0-5.5 MHz. From the factory, the two feedback : capacitors are each 91 pf silver micas. The inductor is paralleled : with approximately 140 pf. The latter is composed of three separate : disc capacitors, ranging from N220 to N330 types. much description deleted... : If anyone has any suggestions or can point out an error in my : thinking on this work, I would certainly appreciate it. : 73, : Jack WB3U Your thinking is okay, it's just a very thorny problem to solve in real life. Think of it in terms of PPM: at 5 MHz, a cheap crystal oscillator (not compensated) will drift 250 to 500 Hz over temp. To get better than that you need better temperature compensation. What you need to do is find out what is drifting, how much, and correct it (like you didn't know that, right ;-). That may mean that you would have to measure specific temperature drifts on caps, and pick particular caps. That may mean, say, getting several 390 pf, N330 caps and picking the one with the exact drift you need. It's tedious, and expensive. I've only been marginally involved with this sort of thing, but I know it takes time. Ideally, if everything had a zero TC, nothing would change, and I like the idea of NPO (COG) caps everywhere. But if the inductor core is what's drifting, your problem would get worse (I'll bet it is the inductor). Perhaps someone in the crystal business will tell you how they make a TCXO, but the basic process is to match the exact crystal variation over temp with an inverse variation in the circuit. You can tune a varactor across the crystal with thermistors. The same approach may work for you. You have to test the oscillator over temperature and find out how much it drifts, then figure how much C you need to pull it in, what voltage to drop in thermistors, etc., etc.. To do this productively, like at a crystal oscillator house, you need to have experience, good measurement equipment and probably curve-fitting software (I'd guess). You could try a couple of other things they do in the crystal business to get around the problem. For example, if the oscillator drifts versus temperature, you can fix its temperature. Just make sure it is held higher than the level it will see during operation. (For example, if the circuit will see 130F, keep the oscillator at 140 or 150, just be sure to use some sort of thermostat). You can use resistors as the heating elements and wrap the whole thing in insulation. Another idea would be to lower the power output in the oscillator, to keep it cooler, and use an amplifier after it to get the signal back. If the problem is heat from elsewhere, though, this won't work. Well, this is sort of vague, but I hope it helps. 73, Bob -- Bob Lombardi WB4EHS from Melbourne, FL >>>>> blombard@iu.net The average male bicycle rider consumes 375 calories to ride 10 miles. The average car uses 1/2 gallon of gasoline, or 18,600 calories, to go the same distance. -- from Bicycle Guide magazine, July 1994 From lwbyppp@epix.net Mon Feb 05 21:42:41 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.frontiernet.net!Empire.Net!news.net99.net!news.igc.net!news.zynet.com!ez0!pagesat.net!netserv.com!aimnet.com!news.exodus.net!uunet!in1.uu.net!iglou!iglou.com!n4lq From: n4lq@iglou.com (Steve Ellington) Subject: Re: Kit HF receivers X-Nntp-Posting-Host: iglou Message-ID: Sender: news@iglou.com (News Administrator) Organization: IgLou Internet Services (1-800-436-4456) X-Newsreader: TIN [version 1.2 PL2] References: <4eb81n$a7l@newsbf02.news.aol.com> <2a6.8071.546@acenet.com> Date: Thu, 1 Feb 1996 13:13:49 GMT Lines: 7 TenTec has just released several nice receiver kits at very low prices. Call them for a flyer. -- Steve Ellington N4LQ@IGLOU.COM Louisville, Ky From lwbyppp@epix.net Mon Feb 05 21:42:42 1996 Path: news.epix.net!news.sprintlink.net!buffnet2.buffnet.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!nntp-hub2.barrnet.net!pacbell.com!amdahl.com!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!howland.reston.ans.net!newsfeed.internetmci.com!uwm.edu!msunews!netnews.upenn.edu!news From: Jaggi@cvrc.med.upenn.edu (Jurg L. Jaggi) Newsgroups: rec.radio.amateur.homebrew Subject: TA7204 audio amp chip Date: Thu, 01 Feb 1996 13:59:42 GMT Organization: University of Pennsylvania Lines: 12 Message-ID: <4eqh0o$tg9@netnews.upenn.edu> NNTP-Posting-Host: brain1.med.upenn.edu X-Newsreader: Forte Free Agent 1.0.82 Hi folks, I recently got a Kyokuto FM144-10SXRII radio. Unfortunately, the audio amplifier chip is defective and needs to be replaced. It is labelled TA7204. Are these chips (still) available? If not, what would be a good choice for a replacement. Thanks for any help and/or advice to get this radio going again. 73s, Jurg KB2WKX From lwbyppp@epix.net Mon Feb 05 21:42:43 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!qns3.qns.com!news.ecn.uoknor.edu!news.cis.okstate.edu!master.ceat.okstate.edu!gcouger From: gcouger@master.ceat.okstate.edu (COUGER GORDON) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dec QEX "construction article??" Date: 1 Feb 1996 15:20:05 GMT Organization: CEAT at Oklahoma State University, Stillwater Lines: 33 Message-ID: <4eqln5$nd6@news.cis.okstate.edu> References: <4eoq1i$c8t@newsgate.sps.mot.com> Reply-To: Gordon Couger NNTP-Posting-Host: master.ceat.okstate.edu In article <4eoq1i$c8t@newsgate.sps.mot.com>, Rand Gray wrote: >Jay Wicklund made some comments about our article in QEX, as though >there was no way of reproducing the design without purchasing one >of our kits. > >We included in the article 100% of the board schematics -- what we >omitted was the 179 page software listing, which was obviously >inappropriate anyway. > >The design includes a DDS which is controlled either from a knob >or a keypad, and includes switching control to support anyone's >RF modules to make up to a 10-band radio. > >The bulk of the article most certainly is NOT a "kit review" as >characterized by KI7RH. > I found the artical very informative. It shows the way a micro is intergrated into a xciver. It provides the info nessary for me to build a radio not only with the kit parts but also intergrating other stuff. I am not a fair test as I write software for a living, but it was clear to me how to do it. If I choose to build one I would like to look at the source code if available to see how they did. I would do it to suit me in the end anyway. Keep up this kind of artical. Gordon AB5DG Gordon Couger Biosystems & Agricultural Engineering. 114 AG Hall Stillwater, OK 74075 gcouger@master.ceat.okstate.edu 405 744 8392 day 625-2855 evenings From lwbyppp@epix.net Mon Feb 05 21:42:45 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hplabs!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock From: dstock@hpqmdla.sqf.hp.com (David Stockton) Subject: Re: PTO Temperature Compensation Sender: news@hpqmoea.sqf.hp.com (SQF News Admin) Message-ID: Date: Thu, 1 Feb 1996 16:39:32 GMT References: <4enu4k$gom@crash.microserve.net> Nntp-Posting-Host: hpqmocc.sqf.hp.com Organization: Hewlett-Packard LTD, South Queensferry, Scotland X-Newsreader: TIN [version 1.1 PL8.8] Lines: 68 WB3U (jackl@pinetree.microserve.com) wrote: : I have four identical PTO's in solid-state rigs that I've been trying : to stabilize, with only limited success. Maybe someone with more : experience in this area can help me with this. It's quite easy to have mechanical expansion effects spoil the stability of a PTO. I've come across ones where it changed everytime I touched them. Look critically at their mechanical design... : I decided to tackle the worst ones first, and I began by replacing the : oscillator transistors with MPF102's. This helped considerably. : Next, following many, many hours of trial and error, I ended up : replacing the silver micas with 100 pf polystyrene capacitors, and the : remaining three compensation capacitors also with polystyrene units. That sounds sensible: get rid of the compensation then use low tempco components everywhere to minimise drift, finally compensate the remaining drift. : Now the first two PTO's drift upward almost an identical amount, about : 200-300 Hz during the same warmup period. This may not sound like : much, but the problem is that when the rig is used to transmit, : chassis temperature quickly rises another 10 or 15 degrees. This : causes another drift to take place during the first hour or so of a : QSO, and the drift amounts to approximately 200-300 Hz. This occurs : in addition to the longer-term warmup drift, and it takes place no : matter how long the rig is powered on prior to the QSO. Note that polystyrene capacitors should never be taken above 70 C as they undergo a permanent value change : There's not much left for me to do, other than trying to find some : type of linear, positive-coefficient capacitor. Mallory does : manufacturer them (disc type SL), but they're apparently difficult to : come by. Also, I've already spent a considerable sum on polystyrene : capacitors and I'm reluctant to buy additional specialized capacitors : after my results with the NPO's. You can go through a lot of components, also virtually nobody nowadays uses controlled (non-zero) tempco capacitors, so finding them is now virtually impossible. Temp compensated ctrstal osc manufacturers use thermistors and varactor diodes. Oxley used to make variable tempco capacitors for osc compensation, but these are also like hen's teeth. I put a circuit for my favourite easy-to-adjust thermistor based compensator in the osc chapter in the 1995 and 1996 ARRL handbooks. Don't try compensation until you've weeded out any poor components, remember that if you have signifiacnt temp changes, you need to make your compensator and the thing that's being compensated heat and cool at the same rates or else you get drift during temp CHANGE and recovery after the change has stopped. Cheers David From lwbyppp@epix.net Mon Feb 05 21:42:46 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!hplabs!hplextra!hplb!hpwin055.uksr!hpqmoea!dstock From: dstock@hpqmdla.sqf.hp.com (David Stockton) Subject: Re: Dec QEX "construction article??" Sender: news@hpqmoea.sqf.hp.com (SQF News Admin) Message-ID: Date: Thu, 1 Feb 1996 17:06:01 GMT References: <4eoq1i$c8t@newsgate.sps.mot.com> Nntp-Posting-Host: hpqmocc.sqf.hp.com Organization: Hewlett-Packard LTD, South Queensferry, Scotland X-Newsreader: TIN [version 1.1 PL8.8] Lines: 52 Rand Gray (randg@sps.mot.com) wrote: I've not got that QEX yet, though I think I tried one out on my spectrum analyser at the famous QRP vicarage (chez G3RJV), courtesy of Sheldon Hands. Sheldon had his proto transceiver along at the G-QRP convention in October, and George G3RJV had bought a DDS unit from Sheldon as a Christmas present, which those of us at the Christmas party had a good play with.... Very, very, nice indeed. One comment; I found a fair amount of processor related noise on the DDS output co-ax coming down as (mostly) a common mode signal. Having a transformer couple at one end of this cable, or else a ferrite sleeve balun helps. This is nothing serious, it's roughly equal to the level of the quantisation noise spurs, and might as well be eliminated as it's easy enough to do.... : We included in the article 100% of the board schematics -- what we : omitted was the 179 page software listing, which was obviously : inappropriate anyway. It'd make a mess of QEX :-) It comes down to coercion. If you make the code available, a few people will program their own CPUs, but the majority will opt for buying PCBs and ready-blown chips. If you don't make the code available, you get loads of people upset about the lack of a choice that they would probably not exercise anyway. What you don't want to happen, of course, is for someone else to take your released code and go into business flogging programmed parts. As the software content of constructional projects is going to continue to increase, I think some effort is needed to find a way round this quandry. There have been some articles in QST where the code has been kept private, and programmed parts made available only from the author. No, it's not a matter of review articles, but I don't see how they are not single-sourced kits with their *assembly instructions* published in a magazine. I don't know of any solution to this problem, but I can see valid concerns for both sides. Cheers David GM4ZNX From lwbyppp@epix.net Mon Feb 05 21:42:48 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: Thu, 1 Feb 1996 17:51:03 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 14 Message-ID: References: <4enu4k$gom@crash.microserve.net> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4enu4k$gom@crash.microserve.net> Jack, in the your PTO temperature compensation problem there is something that is fundamentally wrong in that these units never have need for positive temperature compensation. In fact, if you were to remove the case from most any Collins PTO, there would be N100, N1500 and even N2200 ppm caps there! I would first see that there is no mechanical binding that would cause such problems. Secondly, I suspect that you are suffering from what I call "thermal delay"---that is the ability of the temperature compensating capactior to be in the right physical position to make timely change. This becomes especially critical in units where transmitting heat flows rapidly to the PTO. The only solution is to place the capacitor farther or closer to the heat source experimentally. With your call I suspect you have been around the barn as many times as I, so I will limit comment to this since it might well be a refresher! 73 Cliff Buttschardt W6HDO Morro Bay, Calif From lwbyppp@epix.net Mon Feb 05 21:42:49 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!newsstand.cit.cornell.edu!news.tc.cornell.edu!newsserver.sdsc.edu!newshub.csu.net!newshub.sdsu.edu!ucsnews!sol.ctr.columbia.edu!news.uoregon.edu!newsfeed.internetmci.com!chi-news.cic.net!news.uiowa.edu!news.physics.uiowa.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!usenet.continental.com!usenet From: Paul Christensen Newsgroups: rec.radio.amateur.homebrew Subject: Re: WD-40 vice Contact/Tuner Spray!! Date: 1 Feb 1996 18:27:25 GMT Organization: Continental Cablevision Lines: 11 Message-ID: <4er0md$bi8@usenet.continental.com> References: <4e6tbm$hdv@whidbey.whidbey.com> <4ee9o0$p4m@maureen.teleport.com> NNTP-Posting-Host: 169.152.167.72 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: w7el@teleport.com My favorite cleaner/lubricant for potentiometers and switch contacts was manufactured by Daven. I believe that Daven and Shallco were the sole suppliers of ladder-type audio attenuators to the broadcast mixing console industry (RCA, Gates, Collins, McMartin, etc.). I still have an original container of "Daven Oil" for this purpose and use it sparingly of course. It's got to last me a lifetime! Anyone else remember using Daven Oil? -Paul, N9AZ From lwbyppp@epix.net Mon Feb 05 21:42:50 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news1!ind-004-236-177 From: mai@iquest.net (Patrick Croft) Subject: Re: WD-40 vice Contact/Tuner Spray!! X-Nntp-Posting-Host: ind-004-236-177.iquest.net Message-ID: Sender: news@iquest.net (News Admin) Organization: IQuest Network Services X-Newsreader: News Xpress Version 1.0 Beta #2.1 References: <4eiks1$l4a@pacific.mps.ohio-state.edu> <4en4u5$etm@newsbf02.news.aol.com> Date: Thu, 1 Feb 1996 19:50:44 GMT Lines: 42 w8jitom@aol.com (W8JI Tom) wrote: >In article <4eiks1$l4a@pacific.mps.ohio-state.edu>, James Garland > writes: > >>I've never had the nerve to try this technique. I just can't bring >>myself to dunk, say, my Central Electronics 100V in the bathtub and let >>it soak. I'd be interested in knowing others' experience with this >>cleaning method. Is it really necessary to remove the transformers? What >>happens to the cardboard sleeves of IF transformers? Does it hopeless >>ruin paper capacitors? Are there other precautions to take? >> >>Jim W8ZR > >A bubble bath may be the only way to clean the signal up an old >boatanchor! (Just kidding Jim, I couldn't resist) > >Seriously. I use a quick soapy water bath, a water hose bath, then a >distilled water bath, then I use an airhose to blow em out, then I let the >rig dry under a heatlamp for a few days, and last I put a light coating of >WD-40 in the right spots. I did that to a Ranger, DX-100 and an Apache. > >My rigs now look very clean and still work, only the signals are dirty. > >73 Tom > > This is the basics to what Tektronix and HP equipment went through. Couple added steps included baking in an oven at 135 degrees for about 30-60 min. after the bath. The cleanser used was called 'Swipe", and the currently marketed 'SimpleGreen' appears to be same stuff. Of course all knobs and related parts should be removed and bathed using an ultrasonic cleaner for best results - gets ALL the dirt out. You may need to remark pointer 'dots' or 'lines' - tire markers work great, and available in various colors needed (white, red, yellow, etc). One point to watch - meters! Some aren't sealed and bathing is a problem for them. Worth taking out and cleaning on the bench with a brush. Also, keep a hair dryer handy - after blowing excessive water off, hit with the hair dryer before baking. A lot of test gear valued well above any ham gear received this treatment and was resold as 'reconditioned'. Good luck. Patrick WB9IQI From lwbyppp@epix.net Mon Feb 05 21:42:52 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!usenet From: "Dana H. Myers" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dec QEX "construction article??" Date: 1 Feb 1996 19:52:40 GMT Organization: Sunsoft, Los Angeles Lines: 21 Message-ID: <4er5m8$koq@abyss.West.Sun.COM> References: <4eoq1i$c8t@newsgate.sps.mot.com> NNTP-Posting-Host: vr1000p.west.sun.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1 (X11; I; SunOS 5.5 i86pc) X-URL: news:4eoq1i$c8t@newsgate.sps.mot.com randg@sps.mot.com (Rand Gray) wrote: >Jay Wicklund made some comments about our article in QEX, as though >there was no way of reproducing the design without purchasing one >of our kits. > >We included in the article 100% of the board schematics -- what we >omitted was the 179 page software listing, which was obviously >inappropriate anyway. Since a significant amount of the functionality of the project is contained in that 179 page listing, why is it appropriate to publish the schematics but not the firmware? Is this firmware available in source form via SASE+diskette, or via download? -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Mon Feb 05 21:42:53 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!ub!dsinc!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!news.msfc.nasa.gov!cs.utk.edu!gaia.ns.utk.edu!usenet From: Mark Mansfield Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Re: Looking for mechanical filters. Date: Thu, 01 Feb 1996 21:06:55 -0600 Organization: Univ. of Tenn at Martin Lines: 9 Message-ID: <31117FCF.141@UTM.Edu> References: <310C3942.40B4@UTM.Edu> <$GoHIDAABiDxEwi3@ifwtech.demon.co.uk> <4elo7q$7ih@hobbes.cc.uga.edu> NNTP-Posting-Host: dialup07.utm.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win95; I) CC: markman@utm.edu Xref: news.epix.net rec.radio.amateur.homebrew:13100 rec.radio.swap:56652 Thanks for everyone's response. I'm learning and hearing that maybe the second filter is not the greatest idea but does offer some improvement? Let me ask the group, given the choice between a second IF filter and a DSP, all things considered, for only CW (weak signal work), which would you rather have or recommend? By asking the question, I've certainly gained some knowledge about the second filter, both pro and con. My primary goal is reception at LF with the emission CW (in a otherwise very noisy enviroment at best). Mark From lwbyppp@epix.net Mon Feb 05 21:42:54 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news-feed.mci.newscorp.com!uunet!in2.uu.net!news.ios.com!usenet From: macino@mail.fwi.com@fwi.com Newsgroups: rec.radio.amateur.homebrew Subject: free programs Date: 1 Feb 1996 22:24:31 GMT Organization: Internet Online Services Lines: 10 Message-ID: <4ereiv$1vd@news.ios.com> Reply-To: macino@mail.fwi.com NNTP-Posting-Host: 204.235.86.126 X-Newsreader: IBM NewsReader/2 v1.2 Hi, I've put a few free programs out that might be of interest to experimenters. At this time they are on ftp.qrz.com. ant2.exe, coax2.exe, resist2.e and coil2.e xe. They are all 32 bit OS/2 applications. They are simple graphic programs. and will run with Warp. Teerev.zip which is a graphic EIRP calculator that'll run with Windows is on the ARRL BBS. From lwbyppp@epix.net Mon Feb 05 21:42:55 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!tomrice From: tomrice@netcom.com (Tom R. Rice) Subject: Thordarson Xfmr Specs sought Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) Date: Fri, 2 Feb 1996 01:59:14 GMT Lines: 25 Sender: tomrice@netcom23.netcom.com I've run across two NOS Thordarson power xfmrs, but have no data on their specs. The part number is T-92R21 If some kind soul has a post-WWII Thordarson catalog, I'd appreciate a copy (costs supported, of course), or at least the parameters of this particular xfmr. I could measure the volts parts, but have no real way to measure the power ratings (load it up 'til it gets hot? Bummer!) Thanks and 73 de WB6BYH ----------------------------------------------------------------- Tom Rice WB6BYH || tomrice@netcom.com PO Box 2152 || Livermore, CA 94551 || ----------------------------------------------------------------- -- "Start off every day with a smile and get it over with." --W.C.Fields Tom R. Rice tomrice@netcom.com CIS: 71160,1122 From lwbyppp@epix.net Mon Feb 05 21:42:57 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!swrinde!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: michaelm@doruk.COM.TR (Michael C. McHugh (TA2ZG/W2AV)) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need MC1648P I.C. Date: 2 Feb 96 02:10:14 GMT Organization: ucsd usenet gateway Lines: 23 Message-ID: <9602011813.aa18084@bbs.doruk.com.tr> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu On 30 Jan 1996 dsnowden@ccd.harris.com (Doug Snowden) wrote: >I need 2 or more of these. Anyone know where I can get small quantities >of these - some place without a minimum order? >These are 16 pin DIP VCO s. Hi, Doug - I just got an Oct-Dec 1995 Jameco catalogue that lists the MC1648P for $3.95 in quantity 1-9. Mail is a little slow getting here. They are at 800-831-4242 voice or 800-237-6948 FAX. I don't think they have a minimum order, but they want $5 'processing' for orders under $25. That'd be no problem for me - looking through that catalogue at all the parts I can't get here, I can run up a $25 order in about thirty seconds flat ;-). BTW, the Jameco catalogue shows it as a 14 pin DIP. Hope this helps - 73 de Mike (TA2ZG/W2AV) Remote Sysop TA2EM BBS - first PRBBS in Turkiye Amateur Packet Radio: TA2ZG@TA2EM.#IST.TUR.EU Internet (email only): Michael C. McHugh From lwbyppp@epix.net Mon Feb 05 21:42:58 1996 Path: news.epix.net!news.sprintlink.net!isc-newsserver.isc.rit.edu!jdc3538 From: jdc3538@osfmail.isc.rit.edu (CRONIN) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Stereo xmitter chip? Date: 2 Feb 1996 03:26:56 GMT Organization: Rochester Institute of Technology, Rochester, NY Lines: 40 Message-ID: <4es0a0$8fc@news.isc.rit.edu> References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> NNTP-Posting-Host: grace.isc.rit.edu Keywords: stereo transmitter What you want is the BA-1404. Everything you need is on one chip. Get the Ramsey FM-10 or DC Electronics Stereocaster kit for $30 or so.. By the time you find the BA-1404, a 38 KHz crystal, etc., you may as well have bought the kit. I got a Stereocaster and replaced the output transistor with a MRF581. It was good for 1/4 watt or so when run off 12 volts.. Don't forget a low pass filter... Oh, and they don't use PLL's, but the Stereocaster was stable enough after running for 10 or 15 minutes. The Ramsey is said to drift a little more. Check alt.pirate.radio (or alt.radio.pirate?)for a FAQ. There's a FTP site at ftp.dg.rtp.com or something like that, and a few web pages floating around. 73..Jim N2VNO In article <4emtge$t1g@bcfreenet.seflin.lib.fl.us>, Eliot Fenton wrote: >Pardon my lack of stereo fundamentals............... > >But does anyone know of a chip manufactured by Motorola, National, etc. >that will take left and right stereo audio outputs (from say a C.D. >player) and produce an RF carrier suitable for reception and demod. on any >stereo receiver? If not a single chip, does anyone know of any articles >written on how to build such a thing? I would think the hardest part >would be generating the subcarrier (a PLL?), but I would like to see what >other people have come up with. > >Regards, > >-- > >Eliot Fenton >z007298b@bcfreenet.seflin.lib.fl.us >Compuserve: 72633.3247@compuserve.com > From lwbyppp@epix.net Mon Feb 05 21:42:59 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!newsfeed.internetmci.com!howland.reston.ans.net!blackbush.xlink.net!rz.uni-karlsruhe.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.homebrew Subject: Re: trx designs (vac tube or transistor) help / beginner Date: 2 Feb 1996 07:57:11 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 16 Message-ID: <4esg4n$1nt2@info4.rus.uni-stuttgart.de> References: NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de Keywords: build tube transistor > I'm interested in possibly getting started in ham .. but I'd like to build >my own set. Unfortunately, the only resources I've found to this regard is >anold 20W transmitter vac tube design.. and a corresponding reciever. Wellcome. However, when you want to build your own gear, it is vrey important to carefully choose a design. there are of course lots of nice designs around, eg in the ARRL Handbook. For simplicity and performance designs with transistors and integrated circuits are best. Tubes are only of interest once you get into the state when you are thinking about a kilowatt output power on transmit. 73, Moritz DL5UH From lwbyppp@epix.net Mon Feb 05 21:43:00 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!in1.uu.net!nwnews.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dec QEX "construction article??" Date: Fri, 02 Feb 96 07:58:08 PDT Organization: Northwest Nexus Inc. Lines: 9 Message-ID: References: NNTP-Posting-Host: blv-pm1-ip21.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage Well, I seem to stand alone on this issue, so I'll drop it. Just so there is no misunderstanding, I enjoyed the article in question, and think that the authors did a fine job of design. I just didn't think that it belonged in the "QEX ARRL Experimenters Exchange" (emphasis on exchange) without more disclosure. But I started the thread to see how others felt; and it appears that there isn't a whole lot of interest in the matter. So, thanks for the comments....73 From lwbyppp@epix.net Mon Feb 05 21:43:01 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: ke6tgn@ix.netcom.com(Wanda M Desmond ) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Printer generated transparency problem Date: 2 Feb 1996 09:14:54 GMT Organization: Netcom Lines: 31 Message-ID: <4eskme$496@cloner4.netcom.com> References: <4ep7jg$326k@useneta1.news.prodigy.com> NNTP-Posting-Host: bak-ca1-14.ix.netcom.com X-NETCOM-Date: Fri Feb 02 1:14:54 AM PST 1996 In Jay Wicklund writes: > > >In article <4ep7jg$326k@useneta1.news.prodigy.com>, > writes: > >> I am experiecing difficulty in getting a good solid blackening >>in the solid trace areas of PCB layout transparencies on my Okidata >>OL400 printer.It has been suggested to me that this might be a >>electro static induced problem . Anybody have any good ideas? >> >> >> 73 Ken W6GHV >Hi Ken, well that is certainly an interesting problem. I hope >you get some help with it and post it to the group. I've had >the same problem with my HP Laserjet IIP using one of the films >sold for that purpose. I eventually gave up because the traces >always ended up badly pitted from all the little pinholes. > >73 de KI7RH > I use a Canon Bj-10 to print transparencies. The "trick" is to print two of them. Place one over the other, making very sure they match exactly, and tape them together. This should help alleviate the problem, unless you've got major size holes in the traces. John KE6TGN From lwbyppp@epix.net Mon Feb 05 21:43:02 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!inn From: Don C Hamiel Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: NEED HELP WITH HTX-202 AND ALINCO DJ-160 FINAL Date: 2 Feb 1996 10:00:14 GMT Organization: Hewlett-Packard, San Diego Lines: 6 Message-ID: <4esnbe$i8b@news.sdd.hp.com> References: NNTP-Posting-Host: hpsdlme5.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 9000/730) To: igor@sokol.pssr.e-burg.su X-URL: news:AAEt-xmOHE@sokol.pssr.e-burg.su Xref: news.epix.net rec.radio.amateur.equipment:24537 rec.radio.amateur.homebrew:13114 Igor, the srfh transistor sounds like a Motorola part number. I know that they manufacture a line with the prefix of "SRF". If I can find a data book I will check it for you. 73 de Don N6NLX. From lwbyppp@epix.net Mon Feb 05 21:43:03 1996 Path: news.epix.net!news.sprintlink.net!hideout.emanon.net!alpha.sky.net!winternet.com!mr.net!chi-news.cic.net!newsxfer2.itd.umich.edu!agate!cocoa.brown.edu!news From: CC015012@brownvm.brown.edu (john 015) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Stereo xmitter chip? Date: Fri, 2 Feb 1996 10:08:58 EST Organization: Brown University - Providence, Rhode Island USA Lines: 10 Message-ID: <4et9jr$85g@cocoa.brown.edu> References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> NNTP-Posting-Host: brownvm.brown.edu X-News-Software: BNN via BNN_POST v1.0 beta In article , drm6@psu.edu (Drew R. McGhee) said: >Posted on 31 Jan 1996 at 16:11:57 by Drew R. McGhee >There is a chip that does what you want. Sorry, can't think of the >manufacturer. Ramsey sells two complete kits that uses it and does what you >want. I've seen the chip sold separatly but can't find a listing in a catalog >just for the chip at the present time. Rohm's BA1404 is listed in the Dalbani catalog. j From lwbyppp@epix.net Mon Feb 05 21:43:04 1996 Path: news.epix.net!news.sprintlink.net!buffnet2.buffnet.net!news.tcst.com!dildog.lgc.com!news.sesqui.net!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!newsmaster From: Joerg Hedtmann Newsgroups: rec.radio.amateur.homebrew Subject: Re: Stereo xmitter chip? Date: 2 Feb 1996 10:35:42 GMT Organization: SubSea Offshore Ltd. Lines: 6 Message-ID: <4espdu$h3u@dub-news-svc-2.compuserve.com> References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> NNTP-Posting-Host: dd05-015.compuserve.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) To: drm6@psu.edu There are articles in the old Dutch Free Radio Magazine (Pirates off course). All based on "normal" components. I can post a copy to you, if you contact me. Joerg (GM4YRI/DF3EI) From lwbyppp@epix.net Mon Feb 05 21:43:05 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!pacific.mps.ohio-state.edu!freenet.columbus.oh.us!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!haven.umd.edu!news.umbc.edu!eff!blanket.mitre.org!linus.mitre.org!usenet From: Al Wong Newsgroups: rec.radio.amateur.homebrew Subject: Motorola MICOR - Repeater MOD Date: 2 Feb 1996 13:23:30 GMT Organization: The MITRE Corp. Lines: 11 Message-ID: <4et38i$pom@linus.mitre.org> NNTP-Posting-Host: m24837-pc.mitre.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 32bit) Does any one have any info on modifying the Motorola MICOR to be a repeater? I saw this ad in a recent copy of CQ and was wondering what the specs were and what it entails. -- Al Wong The above opinion is mine, and does KF4GDD not reflect that of my employer. As alwong@mitre.org with all my opinions, I write them, you interpret them. From lwbyppp@epix.net Mon Feb 05 21:43:06 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!gatech!newsjunkie.ans.net!Rezonet.net!mixnews2!qbc-clic!com18!daniel.lacasse Newsgroups: rec.radio.amateur.homebrew In-Reply-To: all@com18.com Subject: If you have a 742 From: daniel.lacasse@com18.com Message-ID: Date: Fri, 2 Feb 96 14:28:00 EST Organization: Babillard COM18 BBS Lines: 1 If you have a 742, let me know... Daniel.Lacasse@com18.com From lwbyppp@epix.net Mon Feb 05 21:43:07 1996 Path: news.epix.net!news.sprintlink.net!aimnet.com!netserv.com!pagesat.net!a3bsrv.nai.net!mgate.arrl.org!news From: Zack Lau Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: 2 Feb 1996 14:41:31 GMT Organization: American Radio Relay League Lines: 13 Message-ID: <4et7qr$384@mgate.arrl.org> References: <823084973.2216@pinetree.microserve.com> NNTP-Posting-Host: zlau.arrl.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: jackl@pinetree.microserve.com Intead of buying costly temperature compensating capacitors, consider the circuit on page 14.20 of the 1996 ARRL Handbook, which uses a pair of thermistors to control a varactor diode. Even better might be a digital circuit that can differentiate between warmup drift and temperature variation, as well as accomodate non-linearities easily. But, I've not seen a published example to copy. Zack KH6CP/1 From lwbyppp@epix.net Mon Feb 05 21:43:08 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!gatech!sdd.hp.com!hpscit.sc.hp.com!rkarlqu From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MIL VCO Date: 2 Feb 1996 16:43:52 GMT Organization: Hewlett-Packard Lines: 12 Message-ID: <4etf08$mg@hpscit.sc.hp.com> References: <4el6f3$r7h@aldebaran.sct.fr> NNTP-Posting-Host: hpscrj.scd.hp.com Xref: news.epix.net sci.electronics.components:1912 rec.radio.amateur.homebrew:13135 In article <4el6f3$r7h@aldebaran.sct.fr>, wrote: >Hi, > >I've heard that a compagny name Avantek (I'm not shure) make high >quality VCO. >a nice opworld@worldnet.fr Avantek is now owned by the Hewlett-Packard Communications Components Division 408-435-7400. Rick Karlquist N6RK HP Santa Clara Div. From lwbyppp@epix.net Mon Feb 05 21:43:09 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!gatech!sdd.hp.com!hplabs!unix.sri.com!news.Stanford.EDU!w6yx.stanford.edu!stevem From: stevem@w6yx.stanford.edu (Steve Muther) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Wanted: 10 Ghz Door Opener Sources Date: 2 Feb 1996 18:13:37 GMT Organization: Stanford Amateur Radio Club Lines: 20 Message-ID: <4etk8h$7ku@nntp.Stanford.EDU> References: <311171D7.515D@skypoint.com> NNTP-Posting-Host: w6yx.stanford.edu In article <311171D7.515D@skypoint.com> Neil Gjere write s: >I'm looking for a source of the 10 Ghz Gunns used in Door Openers. >I'm specifically looking for Solfans or Other cavities that include a >Varactor as well as the Gunn diode in the housing. > >I have several cavities that have just the Gunns in them, and would like >to experiment with other designs. > >73s, > >Neil N0PFZ I don't think any of the modules you mention have varactor diodes in them. Motion detectors, which are just simple doppler radar implementations, don't need varactors and would just be more expensive. What you probably want is a full blown Gunnplexer. Be prepared to pay the price! Steve Muther (WF6R) From lwbyppp@epix.net Mon Feb 05 21:43:10 1996 Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!imci4!newsfeed.internetmci.com!news.connectnet.com!draagen From: draagen@news.connectnet.com (David Negaard) Newsgroups: rec.radio.amateur.homebrew Subject: Interface information for LCD display Date: 2 Feb 1996 18:39:45 GMT Organization: CONNECTnet Internet Network Services (service provider) Lines: 25 Message-ID: <4etlph$qfo@news.connectnet.com> NNTP-Posting-Host: cn1.connectnet.com X-Newsreader: TIN [version 1.2 PL2] Picked up an interesting item at the local "Industrial Liquidator's" yesterday, and I'm wondering if there's anyone out there who can help me learn to interface it. It's a dot-matrix LCD display, 128x67 (I think, it's somewhere between 64 and 70). It has a board attached to the back that has three SMT ICs and one of those odd ribbon connectors like you find inside a PC keyboard, and also inside a lot of lap-tops. Two of the ICs are HD61202s, and one is an HD61203. The ribbon is twenty-conductor. The board is silk-screened with the name "Solomon" and what looks to me like a part number "LM7310SGLU." The bin that the item was found in indicated that the display could 'do' grapics. I'm planning on (eventually) using this item to display information either for my packet/satellite station (still in the conceptual stage), or for my HF station (also still in the conceptual stage). Any help anyone out there can offer would be most welcome. -- San Diego District Youth Leader David Negaard phone: (619) 761-0280 625 Shenandoah Avenue mailto:draagen@connectnet.com San Marcos, CA 92069 http://www3.graceland.edu/~jrmj/negaard From lwbyppp@epix.net Mon Feb 05 21:43:11 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!news.usafa.af.mil!usenet From: Brian Mork Newsgroups: rec.radio.amateur.homebrew Subject: Re: HELP Interference Date: 2 Feb 1996 19:02:47 GMT Organization: United States Air Force Academy Lines: 14 Message-ID: <4etn4n$nkg@usafa2.usafa.af.mil> References: <4el9nf$h@ns2.ptd.net> NNTP-Posting-Host: dfp83.usafa.af.mil Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) georgef@postoffice.ptd.net (George) wrote: >I'm trying to use my AEAfax to receive FAX/RTTY. But My computer >generates too much interfercne. >I'm thinking of running a ground wire from >second floor wind and driving a rod in the ground. Will this help? I >know nothing about grounding. What frequency is the noise? That will affect the answer of whether grounding externally with a ground rod will help. /Brian Mork From lwbyppp@epix.net Mon Feb 05 21:43:12 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!thunder.mgl.ca!granite.sentex.net!torn!howland.reston.ans.net!gatech!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!csn!news.usafa.af.mil!usenet From: Brian Mork Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dec QEX "construction article??" Date: 2 Feb 1996 19:06:27 GMT Organization: United States Air Force Academy Lines: 12 Message-ID: <4etnbj$nkg@usafa2.usafa.af.mil> References: NNTP-Posting-Host: dfp83.usafa.af.mil Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Jay Wicklund wrote: >I subscribed to QEX for the exchange of ideas and >more technical design information than appears in QST; but this >article doesn't do it for me. They're all going this way (gluing together commercially available stuff). Do you get CCInk? I just wrote a letter to their editor saying the same think. I subscribe for ideas, etc, not just extended product reviews. From lwbyppp@epix.net Mon Feb 05 21:43:13 1996 Path: news.epix.net!news.sprintlink.net!noc.netcom.net!news3.noc.netcom.net!ix.netcom.com!howland.reston.ans.net!newsfeed.internetmci.com!news.kei.com!newsstand.cit.cornell.edu!ub!netfs.dnd.ca!nouvelles-sp.e33.dreo.dnd.ca!usenet From: nreed@airsrv.abrdr.dreo.dnd.ca (Norm Reed) Newsgroups: rec.radio.amateur.homebrew Subject: INFO ON FERROXCUBE CHOKES Date: 2 Feb 1996 20:47:29 GMT Organization: DREO Lines: 16 Message-ID: <4ett91$an3@nouvelles.e33.dreo.dnd.ca> Reply-To: nreed@abrdr.dreo.dnd.ca NNTP-Posting-Host: 131.136.36.25 Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.6 Could you please tell me what value a VK200-4 Ferroxcube choke has? Also where to procure them? Thanks -- Norm Reed nreed@abrdr.dreo.dnd.ca DND/DREO/Aerospace Radar & Navigation 3701 Carling Avenue Building T86 Ottawa, ON, Canada K1A 0K2 613-998-2891 fax 990-8906 VE3AJI and VE7ALW From lwbyppp@epix.net Mon Feb 05 21:43:14 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!nntp4.mindspring.com!news.mindspring.com!gatech!swrinde!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!jusdnews.fir.fbc.com!fitt-85.fir.fbc.com!mfischbe From: mfischbe@fir.fbc.com (Mike Fischbein) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WD-40 vice Contact/Tuner Spray!! Date: 2 Feb 1996 23:13:56 GMT Organization: CS First Boston Corporation Lines: 36 Distribution: world Message-ID: <4eu5rk$ouh@jusdnews.fir.fbc.com> References: <4e6tbm$hdv@whidbey.whidbey.com> <4e9a5d$c08@i-2000.com> <1996Jan28.204639.8744@ke4zv.atl.ga.us> <4eiks1$l4a@pacific.mps.ohio-state.edu> <012996190937Rnf0.79b6@ham.island.net> NNTP-Posting-Host: fitt-85.fir.fbc.com X-Newsreader: TIN [version 1.2 PL2] Robert Smits (rs@ham.island.net) wrote: : James Garland writes: : >The suggestion to soak dirty rigs in warm water : >with bubble bath raises a question I've wondered about : >for years. : >I've never had the nerve to try this technique. I : >just can't bring myself to dunk, say, my Central : >Electronics 100V in the bathtub and let it soak. : Never tried it with a scope. I have tried it with an : 8 track tape player : I'd only do this if there was no other way to clean : it, and removing the transformers is certainly : advisable on AC equipment. I used to be responsible for computer access for about 80 users; there were several heavy smokers whose terminal keyboards regularly gave up after three or four months. On a "why not" basis, I tried washing a couple of them in the dishwasher (without the dry cycle, of course) and letting them air dry completely. Worked fine. I rinsed out all the smokers keyboards every two months after that, and had no further problems. mike -- Mike Fischbein mfischbe@fir.fbc.com CS First Boston Any opinions expressed are mine only, and not necessarily those of any other entity. They may not even be mine. From lwbyppp@epix.net Mon Feb 05 21:43:15 1996 Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Path: news.epix.net!news.sprintlink.net!news.cirrus.com!bug.rahul.net!a2i!in-news.erinet.com!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netcom.com!tgm From: tgm@netcom.com (Thomas G. McWilliams) Subject: Re: Looking for mechanical filters. Message-ID: Followup-To: rec.radio.amateur.homebrew,rec.radio.swap Organization: Jot-Em Down Store and Library X-Newsreader: TIN [version 1.2 PL1] References: <310C3942.40B4@UTM.Edu> Date: Sat, 3 Feb 1996 01:31:26 GMT Lines: 15 Sender: tgm@netcom17.netcom.com Xref: news.epix.net rec.radio.amateur.homebrew:13165 rec.radio.swap:56895 Mark Mansfield (markman@UTM.Edu) wrote: : I'm looking for a pair of Collins (or equiv.) mechanical filters for a : CW receiver which I'm building. I'm planning on using one of the filters : in the front of the IF and using another in the "tail-ended" mode after As I recall, Collins mechanical filters are 455 KHz. Toyo makes inexpensive 455 KHz ceramic resonators and filters in various bandwidths, and DigiKey sells them. Obviously these are no match for the mechanical filters. However they are cheap enough such that you could cascade them or use them in various feedback configurations. I saw one design where the ceramic resonator was used instead of an emitter bypass capacitor in an IF amp. The low cost and easy availability of these filters invite experimentation. Thomas KI4N From lwbyppp@epix.net Mon Feb 05 21:43:16 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!lamarck.sura.net!fconvx.ncifcrf.gov!mack From: mack@ncifcrf.gov (Joe Mack) Subject: Re: WD-40 vice Contact/Tuner Spray!! Message-ID: Organization: Frederick Cancer Research and Development Center References: <4e6tbm$hdv@whidbey.whidbey.com> <4ee9o0$p4m@maureen.teleport.com> Date: Sat, 3 Feb 1996 04:16:20 GMT Lines: 33 In article <4ee9o0$p4m@maureen.teleport.com> w7el@teleport.com (Roy Lewallen) writes: >> subbustr@whidbey.net (DAVE M . SCHERTZER) writes: >> Use WD-40 on my mobile rig to fix a LCD prob and >> it worked!!!! Tried contact/tuner spray and had to >> re-apply every 2 weeks, WD-40 no probs fer the >> last 6 months..works fine in a pinch..... >> >> de ve7-lfa > > >I use WD-40 all the time on swiches (rotary, AC power, relays, >you name it), noisy potentiometers, sticky slugs in old UHF >rig inductors, locks, and anything else that slides or turns. >Doesn't hurt any of 'em. It's one of the Great Inventions of >the 20th Century (along with latex paint and plastic drinking >straws. .) > >Roy Lewallen, W7EL > I think last year was the 40th annivesary of WD-40. There was a program on it on NPR (or something). It was the 40th formulation tested to stop rocket parts (or jet aircraft parts) from sticking together (or rusting, don't exactly remember the whole story). WD-40 is the only product of the WD-40 company. I don't think the guy who invented it made much money out of it - it was formulated as an in-house thing. Joe Mack NA3T From lwbyppp@epix.net Mon Feb 05 21:43:19 1996 Path: news.epix.net!news.sprintlink.net!news1.cris.com!news From: mwcook@cris.com (Mike Cook - AF9Y) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: See Weak Signals with your PC & Soundcard Date: 3 Feb 1996 06:47:26 GMT Organization: Concentric Internet Services Lines: 42 Message-ID: <4ev0du$j8m@spectator.cris.com> NNTP-Posting-Host: crc8-fddi.cris.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Xref: news.epix.net rec.radio.amateur.misc:97675 rec.radio.amateur.homebrew:13105 See Weak Signals with your PC & Soundcard FFTDSP is a PC program which uses the soundcard and audio from your radio to detect weak signals The original FFTDSP38 program displays a screen (spectrograph) which shows weak signals as color traces against a dark background. A continuous 4096 Point FFT (fast Fourier transform) is used to provide 640, 2Hz wide filters. FFTDSP41 - Beta Demo Version now available Key Additional Features of the upgraded FFTDSP are: - Record and Playback WAV files for post spectral analysis - Automatic Color Gradient for optimum visibility - Integration mode for signal detection below the noise - Mouse point and click for selective recording - On screen Moon position and TOD tracking - True S/N (in 100 Hz Ref) bar graph - Selective area and mode for S/N display - Display Smoothing Filters - Zoom In/Out for wider frequency coverage - Improved Graphics Interface and Setup Screens - Find Call feature from partial information Available Download Sites for Beta Demo: Internet - http://www.webcom.com/af9y Internet - ftp.webcom.com/pub/af9y BBS - East Coast Atlantic BBS (704) 284-4854 EMail: mwcook@cris.com (preferred) af9y@aol.com From lwbyppp@epix.net Mon Feb 05 21:43:20 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!news.clubnet.net!news.interworld.net!news.net99.net!news1.exit109.com!ppp17-tr From: harryjb@exit109.com (Harry J. Britton) Newsgroups: rec.radio.amateur.homebrew Subject: Receiving SSB on AM SW radio. Date: Sat, 03 Feb 96 16:32:32 GMT Organization: Alantic Internet Technologies, Inc. Lines: 6 Message-ID: <4f02nd$9ib@news1.exit109.com> NNTP-Posting-Host: ppp17-tr.exit109.com X-Newsreader: News Xpress Version 1.0 Beta #4 Hi: I use to only use two radios. One SW receiver, and an ordinary AM is fine. Find the SSB on the SW receiver, and tune around with the AM radio (with the volume down) until you hear a hetrodyning from the AM radio. A simple AM radio can transmit a strong signal sometimes! more than likely, you will be able to find a spur in the band your listening. From lwbyppp@epix.net Mon Feb 05 21:43:21 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: Arizona Microschip Date: Sat, 3 Feb 1996 17:12:23 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 6 Message-ID: References: <4eu5rk$ouh@jusdnews.fir.fbc.com> <4f07e3$me5@newsbf02.news.aol.com> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4f07e3$me5@newsbf02.news.aol.com> Recently, I ran across a reference to Arizona Microchip devices which was interesting. Does anyone have an address or a clue as what they manufacture? I suspect it might be a "STAMP" product but I am not sure. They have a development kit available too. Cliff Buttschardt W6HDO Morro Bay, Calif From lwbyppp@epix.net Mon Feb 05 21:43:22 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!news2.net99.net!news.cais.net!xara.net!peer-news.britain.eu.net!EU.net!newsfeed.internetmci.com!in1.uu.net!news.ios.com!usenet From: macino@mail.fwi.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Thordarson Xfmr Specs sought Date: 3 Feb 1996 20:51:35 GMT Organization: Internet Online Services Lines: 33 Message-ID: <4f0hsn$o0b@news.ios.com> References: Reply-To: macino@mail.fwi.com NNTP-Posting-Host: dialup24.fwi.com X-Newsreader: IBM NewsReader/2 v1.2 In , tomrice@netcom.com (Tom R. Rice) writes: > I've run across two NOS Thordarson power xfmrs, but > have no data on their specs. The part number is > > T-92R21 > > If some kind soul has a post-WWII Thordarson catalog, > I'd appreciate a copy (costs supported, of course), > or at least the parameters of this particular xfmr. > I could measure the volts parts, but have no real > way to measure the power ratings (load it up 'til > it gets hot? Bummer!) > > Thanks and 73 de WB6BYH > >----------------------------------------------------------------- >Tom Rice WB6BYH || tomrice@netcom.com >PO Box 2152 || >Livermore, CA 94551 || >----------------------------------------------------------------- > >-- >"Start off every day with a smile and get it over with." --W.C.Fields >Tom R. Rice >tomrice@netcom.com >CIS: 71160,1122 Weight! Yep, weight will get you into the ballpark on those old iron core xfo rmers at least approximate the KVA rating. WD9AHF p.s. powdered cores and new fangled space aged core designs won't comply. You might try an old NEWARK Catalog. From lwbyppp@epix.net Mon Feb 05 21:43:24 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!inquo!vyzynz!news.dacom.co.kr!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!spool.mu.edu!howland.reston.ans.net!nntp.crl.com!newshub.cts.com!not-for-mail From: jlkolb@sd.cts.com (John Kolb) Newsgroups: rec.radio.amateur.homebrew,rec.radio.swap Subject: Re: Looking for mechanical filters. Date: 3 Feb 1996 23:14:25 GMT Organization: CTS Network Services (CTSNET), San Diego, CA Lines: 38 Message-ID: <4f0q8h$mg0@news3.cts.com> References: <310C3942.40B4@UTM.Edu> NNTP-Posting-Host: sd-i2.cts.com X-Newsreader: TIN [version 1.2 PL2] Xref: news.epix.net rec.radio.amateur.homebrew:13130 rec.radio.swap:56774 Thomas G. McWilliams (tgm@netcom.com) wrote: : Mark Mansfield (markman@UTM.Edu) wrote: : : I'm looking for a pair of Collins (or equiv.) mechanical filters for a : : CW receiver which I'm building. I'm planning on using one of the filters : : in the front of the IF and using another in the "tail-ended" mode after : As I recall, Collins mechanical filters are 455 KHz. Collins mech filters are available in a number of center freqs. My junkbox has CF's of 455, 450, 462, 500, 250 kHz, and maybe others. e-mail for a list of filters for sale. : Toyo makes : inexpensive 455 KHz ceramic resonators and filters in various : bandwidths, and DigiKey sells them. Obviously these are no match for : the mechanical filters. However they are cheap enough such that you : could cascade them or use them in various feedback configurations. I : saw one design where the ceramic resonator was used instead of an : emitter bypass capacitor in an IF amp. The low cost and easy : availability of these filters invite experimentation. Note: ceramic resonators are a two terminal device, much like a quartz crystal, except not as stable or as high a Q. Replacing the emitter bypass cap of the IF stages DOES work well, but is becoming less of an available option as receivers go to mostly integrated circuits. You have some degree of control over the results by selecting the resonators: two resonators with a CF of 455 kHz will give a sharper IF than one of 456 and one of 454 kHz. This has been an interesting thread, but perhaps it should stay in r.r.a.homebrew, and not rec.radio.swap if continued. John Kolb KK6IL jlkolb@cts.com From lwbyppp@epix.net Mon Feb 05 21:43:25 1996 Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!usenet From: kmiller@airmail.net (Kerry W. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: Re: controlled carrier AM? Date: Sat, 03 Feb 1996 23:55:25 GMT Organization: customer of Internet America Lines: 26 Message-ID: <4f0sm1$as8@news-f.iadfw.net> References: NNTP-Posting-Host: dal21-27.ppp.iadfw.net X-Newsreader: Forte Free Agent 1.0.82 Michael Haydon wrote: >Read an article in april 1962 qst regarding controlled carrier amplitude >modulation, YES A.M.!!!. anyone tried this technique? Article was on 40w >mobile rig. am hoping to put together 300watt or so unit using a pair of >microwave oven transformers, but am wondwering abt their audio freq. >response. >any replies commenting on how much you hate am will be ignored. Not sure about the audio response, but know about controlled carrier a.m. a little. I hv an old set of Drake Twins which use controlled carrier. The guys on the other end don't seem to even notice the difference unless I say something about it. The benefit isn't so much that you get more power, but that you have less dissipation to get the same power. The Drake uses sweep tubes, it wouldn't do but a few watts if it used regular full carrier a.m. Sounds like a neat project, good luck! Ok, so I didn't provide any help, just defending a.m. in advance of the attacks! I also run a Yaesu FT-990, but the a.m. sounds better on the Drakes, even though it has less power! 73, Kerry WD5ABC From lwbyppp@epix.net Mon Feb 05 21:43:26 1996 Path: news.epix.net!news.sprintlink.net!news.comm.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!news.iadfw.net!usenet From: kmiller@airmail.net (Kerry W. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: QRP Schematics scanned and ready! Date: Sat, 03 Feb 1996 23:58:35 GMT Organization: customer of Internet America Lines: 15 Message-ID: <4f0sru$as8@news-f.iadfw.net> NNTP-Posting-Host: dal21-27.ppp.iadfw.net X-Newsreader: Forte Free Agent 1.0.82 Hi guys, I finally got the schematics scanned today. They need a little cleaning up, but they're about ready. I'm open for suggestions, should I post them here, somewhere else, or just e-mail them to whoever wants them. Does anybody mind if I post them here? Is there a proper place to post a schematic? They are bmp's now, would .jpg's be better? All these dumb questions from a newbie poster! I don't even know for sure I can post them, but I'll try it somewhere first. Thanks, Kerry Miller kmiller@airmail.net WD5ABC From lwbyppp@epix.net Mon Feb 05 21:43:27 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!howland.reston.ans.net!vixen.cso.uiuc.edu!newsfeed.internetmci.com!tank.news.pipex.net!pipex!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: Sun, 04 Feb 96 02:09:52 GMT Lines: 52 Message-ID: <823443771.29689@pinetree.microserve.com> References: <4enu4k$gom@crash.microserve.net> <4eqdr2$pjm@cc.iu.net> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 First, I want to thank everyone for the excellent ideas and information on this subject. The first two PTO's are back in the rig now and I have had a chance to use them on the air for a few days. They seem to have settled down a little, or at least they're not showing the same drift characteristics as when they were on the test bench. I'm not sure why that is, because I was testing them in the rig after each change. At any rate, the initial, slow warmup drift now seems to be downward rather than upward, indicating that some additional compensation might be needed. It's not too bad though, and I may leave it as-is. The drift that occurs when I begin transmitting (which is aggravated when I use my amplifier because it's next to the rig), is still in an upward direction. This may be the result of a temperature gradient across the PTO components (I think it was Cliff who mentioned that possibility). Short of potting the PTO or installing a heater, there may not be much I can do about this. I want to mention that the problem isn't all that bad, and maybe I'm just being picky. I was reading an older receiver construction article recently titled "An Engineer's Ham-Band Receiver", which describes a very well-constructed piece of equipment. The author's VFO was built on a custom (heavy) subassembly using a few of the parts from a BC-221 frequency meter. When he talks about how good the stability is, he describes it as being within 5 ppm per degree (Centigrade, I think). Now, if my math is correct, that means that at a PTO frequency of approximately 5 MHz, a temperature change from 70F to 80F could cause a frequency change of as much as 150 Hz. Actually, the PTO's I've already worked on are not be too far from that kind of stability at this point, at least for initial drift. I guess what's bothering me most about this is that my old Yaesu FT-101EE was like a rock, despite the fact it was a hybrid. After a fifteen minute warmup, I could ragchew for hours on CW without touching the dial once. Maybe this was just luck of the draw; some owners I've talked to have apparently had major problems with drift in their 101's. Anyway, the responses to my original question are enough to keep me busy reading, checking components and experimenting for several weeks or even months. As a possible alternative before I start this project in earnest, can anyone tell me whether it's feasible to consider replacing the PTO's with 5-5.5 MHz synthesizers? I've missed most of the QST/CQ/Ham Radio articles in the last five years so I'm not familiar with advances regarding available components. Is it possible to build a synthesizer for this application with 10 Hz resolution at a reasonable cost, say with two or three chips? Or is this the type of design that still requires a fairly complex circuit? Tnx & 73, Jack WB3U From lwbyppp@epix.net Mon Feb 05 21:43:29 1996 Path: news.epix.net!news.sprintlink.net!noc.netcom.net!news3.noc.netcom.net!ix.netcom.com!howland.reston.ans.net!gatech!newsfeed.internetmci.com!in2.uu.net!news.goodnet.com!goodguy!ecloud From: ecloud@goodguy (Shawn Ruttledge) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: 4 Feb 1996 05:05:29 GMT Organization: GoodNet Lines: 18 Message-ID: <4f1eqp$do7@news1.goodnet.com> References: <4d5d0k$8vm@newsbf02.news.aol.com> <4d7lvt$cea@newsbf02.news.aol.com> <1996Jan13.104606.4572@ke4zv.atl.ga.us> <4e9pvl$si0@oskgw.osk.sony.co.jp> NNTP-Posting-Host: goodnet.com X-Newsreader: TIN [version 1.2 PL2] While we're on the subject, can anybody identify this MOV (at least I think it's an MOV): ZNR 14K201U U 46 It's black, shiny, looks like a disc cap but is a bit too thick to be one of those, and I can see through the coating that the leads bend and go to the center of the material. I'd like to find out what the joule rating is for the se - maybe they'd be useful. I got a bunch of them in a Circuit Specialists mystery box. My meter says the capacitance is 878 pF. -- _______ KB7PWD @ KC7Y.AZ.US.NOAM ecloud@goodnet.com (_ | |_) html: http://www.goodnet.com/~ecloud __) | | \__________________________________________________________________ * OO * Khoros * Linux * robotics * techno * Gravis Ultrasound * X window * From lwbyppp@epix.net Mon Feb 05 21:43:30 1996 Path: news.epix.net!news.sprintlink.net!news.missouri.edu!hptemp1.cc.umr.edu!gamma.rollanet.org!access-1-1.rollanet.org!joeh From: joe haas Newsgroups: rec.radio.amateur.homebrew Subject: Yaesu FT-530 remote control info Date: 4 Feb 1996 06:02:03 GMT Organization: FF Systems Lines: 16 Distribution: world Message-ID: <4f1i4r$etc@gamma.rollanet.org> NNTP-Posting-Host: access-1-1.rollanet.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Newsreader: Nuntius 2.0.4_68K X-XXMessage-ID: X-XXDate: Sun, 4 Feb 1996 06:07:11 GMT I am looking for info concerning the fromat of the remote control data stream used by the Yaesu MH-29(a2b) speaker mic and the FT-530 dual band HT. I do not have the aforementioned speaker mic, so I can't "reverse engineer" the spec. I want to build a remote control interface for my computer and need the formats to change frequency, band, etc... *************************************** * From the desktop of Joe Haas, KE0FF * ******************************************************************* * FF Systems (314) 368-3716 (voice) * * P.O. Box 2363 (314) 364-4328 (fax) * * Rolla, MO 65402 http://www.rollanet.org/~joeh * * ...Where repeater controllers (and other stuff) are cool... * ******************************************************************* From lwbyppp@epix.net Mon Feb 05 21:43:31 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: SB-220 BAND SWITCH REPLACEMENT Date: 4 Feb 1996 14:34:42 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 20 Sender: root@newsbf02.news.aol.com Message-ID: <4f31oi$lkj@newsbf02.news.aol.com> References: <4f28pv$c1a@alterdial.UU.NET> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4f28pv$c1a@alterdial.UU.NET>, "Thomas L. Gaines, Sr." writes: > >I am looking for a replacement switch deck(wafer) for the SB-220 >amplifier. If anyone has a substitution, plase give me the source.\\ > >Tom Gaines/N5ISE > > Buy an Ameritron AL-80B bandswitch and use the wafers in the Heathkit. The single rear wafer is the only one necessary to use, unless you want 160 through 10. The voltage rating is higher, so the switch won't be damaged as easily if you mis-tune or underload the amp.. Improper loading is by far the biggest cause of switch failure. 73 Tom From lwbyppp@epix.net Mon Feb 05 21:43:32 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!news.emf.net!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: controlled carrier AM? Message-ID: <1996Feb4.153405.15476@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: Date: Sun, 4 Feb 1996 15:34:05 GMT Lines: 21 In article Michael Haydon writes: >Read an article in april 1962 qst regarding controlled carrier amplitude >modulation, YES A.M.!!!. anyone tried this technique? Article was on 40w >mobile rig. am hoping to put together 300watt or so unit using a pair of >microwave oven transformers, but am wondwering abt their audio freq. >response. >any replies commenting on how much you hate am will be ignored. Controlled carrier AM is a lot harder to get to work *right* than it may appear. It's usually better to just beef up the PA to run regular plate modulation, or build a high level DSB rig. The latter is even more conserving of input power, and not really harder to do than doing controlled carrier correctly. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Mon Feb 05 21:43:33 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.u.washington.edu!uw-beaver!nntp.cs.ubc.ca!newsxfer.itd.umich.edu!newsxfer2.itd.umich.edu!chi-news.cic.net!nntp.coast.net!howland.reston.ans.net!news-e1a.megaweb.com!pop.gnn.com!DBerg95252 From: DBerg95252@gnn.com (DENNIS BERG) Newsgroups: rec.radio.amateur.homebrew Subject: Feb '96 QST Rotator pal Date: Sun, 04 Feb 1996 15:59:33 Organization: GNN Lines: 7 Message-ID: <4f36uc$9mh@news-e2a.gnn.com> NNTP-Posting-Host: www-36-171.gnn.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" X-GNN-NewsServer-Posting-Date: 4 Feb 1996 21:03:08 GMT X-Mailer: GNNmessenger 1.2 Has anyone completed building the rotator pal and found it to work without modifications. My first attempt at it has been a dud. Seems most of the projects listed in most magizines require a patch to work. Problem is the patch doesn't show up untill several months have gone by. From lwbyppp@epix.net Mon Feb 05 21:43:34 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.u.washington.edu!news.alt.net!news1.alt.net!news.exodus.net!uunet!in1.uu.net!oronet!news From: rst-engr@oro.net (Jim Weir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: controlled carrier AM? Date: Sun, 04 Feb 1996 18:09:48 GMT Organization: RST Engineering Lines: 26 Message-ID: <4f2srh$7bs@hg.oro.net> References: NNTP-Posting-Host: rst-engr.oro.net X-Newsreader: Forte Free Agent 1.0.82 Michael Haydon wrote: >Read an article in april 1962 qst regarding controlled carrier amplitude >modulation, YES A.M.!!!. anyone tried this technique? Make my living at it. Are you referring to controlled carrier as in controlling the RF drive to the final stage or controlled carrier as in supply half the Vcc to the finals through a modulator that then swings from ground to Vcc? > Article was on 40w >mobile rig. am hoping to put together 300watt or so unit using a pair of >microwave oven transformers On what frequencies, and what does a uwave oven transformer have to do with it? Jim Jim Weir VP Engineering | You bet your sweet patootie I speak RST Engineering | for the company. I OWN the cotton- Grass Valley CA 95945 | pickin' company. voice/fax 916/272-1432 | AR Adv. WB6BHI Cessna 182A N73CQ rst-engr@oro.net | Comm'l Pilot & CFI Airplane/Glider A&P Mechanic From lwbyppp@epix.net Mon Feb 05 21:43:35 1996 Path: news.epix.net!news.sprintlink.net!noc.netcom.net!news4.noc.netcom.net!nntp.coast.net!zombie.ncsc.mil!news.duke.edu!usenet From: jimbob@acpub.duke.edu (James P. Meyer) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Re: See Weak Signals with your PC & Soundcard Date: Sun, 04 Feb 1996 19:31:28 GMT Organization: Duke University, Durham, NC, USA Lines: 16 Message-ID: <311508e9.3398429@news.duke.edu> References: <4ev0du$j8m@spectator.cris.com> NNTP-Posting-Host: async46.async.duke.edu X-Newsreader: Forte Agent .99c/16.141 Xref: news.epix.net rec.radio.amateur.misc:97740 rec.radio.amateur.homebrew:13133 mwcook@cris.com (Mike Cook - AF9Y) wrote: >Available Download Sites for Beta Demo: > > Internet - http://www.webcom.com/af9y > Internet - ftp.webcom.com/pub/af9y > BBS - East Coast Atlantic BBS (704) 284-4854 > Adding a tilde (~) before the "af9y", like this "~af9y", might be necessary for some ftp or web browser programs. Jim From lwbyppp@epix.net Mon Feb 05 21:43:36 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!nntp.coast.net!zombie.ncsc.mil!news.duke.edu!usenet From: jimbob@acpub.duke.edu (James P. Meyer) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: Sun, 04 Feb 1996 19:40:07 GMT Organization: Duke University, Durham, NC, USA Lines: 16 Message-ID: <31150af3.3920546@news.duke.edu> References: <4d5d0k$8vm@newsbf02.news.aol.com> <4d7lvt$cea@newsbf02.news.aol.com> <1996Jan13.104606.4572@ke4zv.atl.ga.us> <4e9pvl$si0@oskgw.osk.sony.co.jp> <4f1eqp$do7@news1.goodnet.com> NNTP-Posting-Host: async46.async.duke.edu X-Newsreader: Forte Agent .99c/16.141 ecloud@goodguy (Shawn Ruttledge) wrote: >While we're on the subject, can anybody identify this MOV (at least I think >it's an MOV): > >ZNR >14K201U >U 46 Check your DigiKey catalog. They're nominal 130 VAC "ZNR"s. 4500 Amp surge rating. They'd make ideal surge suppressors for 120 Volt AC applications like turning a regular outlet strip into a "protected" strip. Jim From lwbyppp@epix.net Mon Feb 05 21:43:37 1996 Path: news.epix.net!news.sprintlink.net!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: jastorm@ix.netcom.com (Jim Storm) Newsgroups: rec.radio.amateur.homebrew Subject: Re: SB-220 BAND SWITCH REPLACEMENT Date: Sun, 04 Feb 1996 21:05:42 GMT Organization: ix.netcom.com Lines: 12 Message-ID: <4f3737$hhu@cloner2.ix.netcom.com> References: <4f28pv$c1a@alterdial.UU.NET> NNTP-Posting-Host: smx-ca3-10.ix.netcom.com X-NETCOM-Date: Sun Feb 04 1:05:43 PM PST 1996 X-Newsreader: Forte Free Agent 1.0.82 "Thomas L. Gaines, Sr." wrote: >I am looking for a replacement switch deck(wafer) for the SB-220 >amplifier. If anyone has a substitution, plase give me the source.\\ >Tom Gaines/N5ISE According to QST, parts are still available from the Heath Order Desk at 616-925-5899/4914. 73, Jim WB6LWS From lwbyppp@epix.net Mon Feb 05 21:43:38 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!clio.trends.ca!io.org!winternet.com!dimensional.com!news.wizard.com!imci5!imci4!newsfeed.internetmci.com!edisto.awod.com!harbour.awod.com!usenet From: glittle@awod.com (Glenn E. Little) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: 4 Feb 1996 21:12:09 GMT Organization: Amateur Radio Lines: 30 Message-ID: <4f37f9$i0b@harbour.awod.com> References: <4d5d0k$8vm@newsbf02.news.aol.com> <4d7lvt$cea@newsbf02.news.aol.com> <1996Jan13.104606.4572@ke4zv.atl.ga.us> <4e9pvl$si0@oskgw.osk.sony.co.jp <4f1eqp$do7@news1.goodnet.com> NNTP-Posting-Host: chs0053.awod.com X-Newsreader: WinVN 0.92.6+ In article <4f1eqp$do7@news1.goodnet.com>, ecloud@goodguy (Shawn Ruttledge) sa ys: > >While we're on the subject, can anybody identify this MOV (at least I think >it's an MOV): > >ZNR >14K201U >U 46 > >It's black, shiny, looks like a disc cap but is a bit too thick to be one of >those, and I can see through the coating that the leads bend and go to the >center of the material. I'd like to find out what the joule rating is for th ese >- maybe they'd be useful. I got a bunch of them in a Circuit Specialists >mystery box. My meter says the capacitance is 878 pF. > The ZNR implies that they are made by Panasonic. Digi-Key sells Panasonic MOVs. Their catalog should shead some light on the ratings. 201 gives voltage at 200 volts +- 10% 14 is the series surge current is 4500 Amps. Max allowable voltage ia 130 VAC, 270 VDC Hope this helps 73 Glenn WB4UIV From lwbyppp@epix.net Mon Feb 05 21:43:39 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!in2.uu.net!gunner.wpe.com!news From: Eddie Caffray Newsgroups: rec.radio.amateur.homebrew Subject: English IC Chip Needed Date: Sun, 04 Feb 1996 22:58:28 -0500 Organization: Oneonta Amateur Radio Club Lines: 4 Message-ID: <31158064.4BB3@magnum.wpe.com> NNTP-Posting-Host: ppp10.wpe.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0GoldB1 (Win95; I) I have some Baxall video cameras from Great Britan, model CD6210/24AB. I need a IC part number NXA1031/103. Wnat to use them for ATV work. Eddie N2XDS From lwbyppp@epix.net Mon Feb 05 21:43:40 1996 Path: news.epix.net!news.sprintlink.net!paperboy.ids.net!anomaly.ideamation.com!anomaly.ideamation.com!not-for-mail From: kd1hz@anomaly.ideamation.com (Michael P. Deignan) Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: 82 Repeater in Kansas City Date: 4 Feb 1996 23:21:25 -0500 Organization: The Ace Tomato Company Lines: 20 Message-ID: <4f40k5$1q9@anomaly.ideamation.com> References: <4efpb3$pt2@alpha.sky.net> NNTP-Posting-Host: anomaly.ideamation.com Xref: news.epix.net rec.radio.amateur.policy:33006 rec.radio.amateur.antenna:18905 rec.radio.amateur.equipment:24587 rec.radio.amateur.homebrew:13144 rec.radio.amateur.digital.misc:13971 In dbaker@mail.bcpl.lib.md.us (Donald I. Baker) writes: >Technical solutions do exist. Using a "TX-ID" board, which uniquely >fingerprints each transmitter and a PC one can "slectively" include or >preclude individual users. > >The board was not meant for that purpose, but with just a little Basic of C >codes, it workd just fine. It is especially easy if you have a single or >limited number of receive site. I too can attest to the helpfulness of the TX-ID system. Coupled with our Doppler Systems DF gear, the TX-ID has allowed us to bag several Drew-like scumbags here in the RI area who have no appreciation for Part 97. MD -- -- -- "Who needs looks when you've got taste?" -- From lwbyppp@epix.net Mon Feb 05 21:43:41 1996 Path: news.epix.net!news.sprintlink.net!news.zeitgeist.net!bdt.com!news.ossi.com!agate!howland.reston.ans.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: wrinkle paint Date: Mon, 05 Feb 96 01:11:24 GMT Lines: 39 Message-ID: <823526669.21059@pinetree.microserve.com> References: <4egsuk$40b@news.wco.com> <1996Jan29.151709.13202@ke4zv.atl.ga.us> <4eovge$n7m@usenet.continental.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 This is slightly off the subject, but I wanted to mention something that might help someone who's painting a cabinet but doesn't want wrinkle paint. I recently built a custom desk for my ham shack and I needed to match a light gray formica finish on some other office furniture in the same room (as per instructions from XYL). The paint I used was Dutch Boy Floor and Porch polyurethane enamel, custom mixed to match the color. I brushed on two coats but the paint was very thick and it refused to completely level (even though it took six or seven hours for the surface to dry). What I ended up with was a lot of brush marks and streaks on an otherwise nice-looking desk. Another application method was needed, but due to winter weather, it was impossible to load up my spray gun and take the piece outside. Finally, I went back to the hardware store and purchased several mini- size 3" paint rollers intended for trim work. I used these to apply a third coat to the piece, and that coat not only hid the previous faux pas, it left a great-looking textured finish. I have since tried this paint on a small aluminum panel, using the same application technique but sanding the panel with 100-grit first. The result was a terrific semi-gloss finish with a *light* texture that looks like an expensive powder-coat paint job. After a week or so, the surface becomes so hard it's almost impossible to scratch unless you're really trying to damage it. Anyone wanting to paint or repaint a piece of equipment owes this method a try. The materials are cheap and the resulting finish is tougher than many spray enamels (and much tougher than lacquer). Clean-up is simple too - throw away the roller and put the lid back on the can. This is one of the few ways I know to produce a genuine high-quality finish at home without commercial-grade equipment. With just a little care, it should last the life of the equipment. 73, Jack WB3U From lwbyppp@epix.net Mon Feb 05 21:43:43 1996 Path: news.epix.net!news.sprintlink.net!cc.iu.net!news From: blombard@iu.net (Bob Lombardi) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: 5 Feb 1996 02:36:13 GMT Organization: Organized? I can't even find my car keys Lines: 44 Message-ID: <4f3qet$ehi@cc.iu.net> References: <4enu4k$gom@crash.microserve.net> <4eqdr2$pjm@cc.iu.net> <823443771.29689@pinetree.microserve.com> NNTP-Posting-Host: netport-80.iu.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 In article <823443771.29689@pinetree.microserve.com>, jackl@pinetree.microserv e.com says... > > much deleted.... >Anyway, the responses to my original question are enough to keep me >busy reading, checking components and experimenting for several weeks >or even months. As a possible alternative before I start this project >in earnest, can anyone tell me whether it's feasible to consider >replacing the PTO's with 5-5.5 MHz synthesizers? I've missed most of >the QST/CQ/Ham Radio articles in the last five years so I'm not familiar >with advances regarding available components. Is it possible to build >a synthesizer for this application with 10 Hz resolution at a reasonable >cost, say with two or three chips? Or is this the type of design that >still requires a fairly complex circuit? > >Tnx & 73, >Jack WB3U As a synthesizer designer, I'd say to be careful. I really think it's so much easier to design a bad synthesizer than a bad PTO, that I wouldn't recommend going that route. Unless you want to read up on and learn about PLL design as a new hobby, in which case go for it. That said, I think I'd look long and hard at a DDS for this job. Use a TCXO for the source, and get one of those CMOS DDSes that will handle at least a 20 MHz clock. Wrap a good tight BP filter around it, and it seems like a good approach. Any reasonable approach using regular PLLs would entail at least a couple of loops, and be fairly complex, IMO. 73, Bob -- Bob Lombardi WB4EHS in Melbourne, FL o \---\---\ blombard@iu.net or blombard@freenet.fsu.edu /\ | Telescope making, optics, astronomy, piano, bicycling -\ 7 & radio | I've run out of things I can say in 4 lines. (*)/(*) | From lwbyppp@epix.net Mon Feb 05 21:43:44 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!usenet.eel.ufl.edu!col.hp.com!sdd.hp.com!usc!cs.utexas.edu!news.eas.asu.edu!news.asu.edu!aztec.asu.edu!ballnt From: ballnt@aztec.asu.edu (John Ballentine) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Arizona Microschip Date: 5 Feb 1996 03:52:33 GMT Organization: Arizona State University, Tempe, AZ (USA) Lines: 17 Message-ID: <4f3uu1$dr3@news.asu.edu> References: <4eu5rk$ouh@jusdnews.fir.fbc.com> <4f07e3$me5@newsbf02. Reply-To: ballnt@aztec.asu.edu (John Ballentine) NNTP-Posting-Host: aztec.asu.edu In a previous article, cbuttsch@biggulp.callamer.com (Clifford Buttschardt) sa ys: >Recently, I ran across a reference to Arizona Microchip devices which was >interesting. Does anyone have an address or a clue as what they >manufacture? I suspect it might be a "STAMP" product but I am not >sure. They have a development kit available too. >Cliff Buttschardt W6HDO Morro Bay, Calif > This probably refers to Microchip Technology. They make microcontroller chips and do have several development kits available. I don't have the address or phone number, but the main offices are here in Chandler, AZ on Chandler Blvd. -- John Ballentine WB2SNB Divina natura dedit agros, Chandler, Arizona ars humana aedificavit urbes. From lwbyppp@epix.net Mon Feb 05 21:43:46 1996 Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!usenet From: kmiller@airmail.net (Kerry W. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: First QRP schematic (description) Date: Mon, 05 Feb 1996 04:32:31 GMT Organization: customer of Internet America Lines: 21 Message-ID: <4f419j$idg@news-f.iadfw.net> NNTP-Posting-Host: dal10-16.ppp.iadfw.net X-Newsreader: Forte Free Agent 1.0.82 Ok, here goes nothing. I'm trying a small one first. This is a single-chip vfo/exciter from 73 magazine. It has several files, all zipped together into 1. The parts list may not be legible, so I retyped it along with some instructions for the tuning capacitor. If this one works, I'll start sending the others as soon as I get them cleaned up a little better. I've heard from several guys, if email attatchments work better, I'll do that too, I'm easy! I'll give this a try, be patient, I've never posted a file before. Funny, you get DXCC, but you still don't know how to use a stupid news reader! Here goes nothing, hope it works! Let me know what you think. The other ones are a 40 and an 80 meter transmitter, and a few odd tx/rx/tranceiver schematics. I'll attatch the schematic to a different file so those who aren't interested won't have to wait on a download! 73, Kerry kmiller@airmail.net From lwbyppp@epix.net Mon Feb 05 21:43:46 1996 Path: news.epix.net!news.sprintlink.net!shore4.intercom.net!usenet From: "Steven A. Bailey" Newsgroups: rec.radio.amateur.homebrew Subject: Toner Transfer System? Date: 5 Feb 1996 13:08:33 GMT Organization: Skipjack.net Lines: 9 Message-ID: <4f4vgh$s9i@shore4.intercom.net> NNTP-Posting-Host: modem186.intercom.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) Has anyone ever tryed this 'Toner Transfer System' by DynaArt Designs for PCB creation? Thanks, Steve WF3O From lwbyppp@epix.net Fri Feb 09 16:59:46 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!tank.news.pipex.net!pipex!europa.chnt.gtegsc.com!news.msfc.nasa.gov!bcm.tmc.edu!news.tamu.edu!news.utdallas.edu!news.swmed.edu!news From: Antonio Howell Newsgroups: rec.radio.amateur.homebrew Subject: (no subject) Date: 7 Feb 1996 21:19:26 GMT Organization: UT Southwestern Medical Center Lines: 5 Message-ID: <4fb50u$k5v@swsu65.swmed.edu> NNTP-Posting-Host: 129.112.43.147 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; PPC) X-URL: news:rec.radio.amateur.homebrew Looking to buy a scanner that has been fixed to get all the cellular channels. Please write me if you know where I can find one From lwbyppp@epix.net Fri Feb 09 16:59:47 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!ccsun2.sogang.ac.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: hsd@vmei.acad.bg Newsgroups: rec.radio.amateur.homebrew Subject: (none) Date: 6 Feb 96 19:28:42 GMT Organization: ucsd usenet gateway Lines: 14 Message-ID: <9602061929.AA12078@amigo.acad.bg> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Hi ! I'm interested in make-it-yourself metal detectors. I need a description and schematics for such devices. Somehow I tend to trust the British magazine Practical Electronics , but I have access to issues up to 1990. In July and October 1988 issues there are such articles, but they are missing. The central Science and Technology Library In my country has no extra magazines. Any PE readers or someone who can access searchable databases holding past issues of PE, please help. PS-I hope this group accepts non-ham-related questions as well Thank you Christo Bulgaria From lwbyppp@epix.net Fri Feb 09 16:59:48 1996 Path: news.epix.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!globe.indirect.com!s92.phxslip4.indirect.com!tracker From: tracker@indirect.com (Mark Saunders) Newsgroups: rec.radio.amateur.homebrew Subject: 1996 ARRL November Sweepstakes Location Needed Date: Thu, 1 Feb 1996 20:52:23 UNDEFINED Organization: Amateur Radio Station KJ7BS Lines: 38 Message-ID: NNTP-Posting-Host: s92.phxslip4.indirect.com X-Newsreader: Trumpet for Windows [Version 1.0 Rev B final beta #1] Dan Rockhold, AB7AS and Mark Sunders, KJ7BS are looking for a location in North Dakota from which to operate AB7AS during the 1996 ARRL November Sweepstakes. If you are not a contester or know someone who is not a contester, and would be agreeable to having 2 guest operators for the contest, please respond! We are in the planning stages for this expedition, but we need to get a location very soon. We are interested in the station equipment, especially the antennas. We can bring out own radios, power supplies, computers and interfaces, if necessary. However, we can not bring the antenna farm, too. The station owner is more than welcome to join us in out endevor, or just watch, keep up awake, or what ever. WE WANT YOU TO BE PART OF OUR TEAM. Our goal is NOT to win the contest, but to have a good time and gain new operating skills. From Dan's home QTH in Phoenix, AZ, we got all but 7 sections in the 1995 November Sweepstakes. We do have a lot of fun with this hobby. If you are interested, or know someone who is interested, please contact me or Dan at one of the addresses below. Mark Saunders, KJ7BS tracker@indirect.com KJ7BS@KC7Y.AZ.USA.NOAM Dan Rockhold, AB7AS danr@goodnet.com 73 DE Mark Saunders - KJ7BS Glendale, AZ PACKET: KJ7BS@N7MRP.AZ.USA.NOAM INTERNET: tracker@indirect.com From lwbyppp@epix.net Fri Feb 09 16:59:51 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!chassis.demon.co.uk From: David Chapman Newsgroups: rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,sci.electronics.components Subject: Re: 7910 MODEM CHIPS WANTED Date: Tue, 06 Feb 96 21:28:38 GMT Organization: Chapman Associates Lines: 25 Message-ID: <823642118snz@chassis.demon.co.uk> References: <4f7mjg$o4r@netty.york.ac.uk> Reply-To: dave@chassis.demon.co.uk X-NNTP-Posting-Host: chassis.demon.co.uk X-Newsreader: Demon Internet Simple News v1.29 X-Mail2News-Path: chassis.demon.co.uk Xref: news.epix.net rec.radio.amateur.digital.misc:14017 rec.radio.amateur.homebrew:13192 sci.electronics.components:1998 Hi David... > does anyone have any 7910 or 7911 modem chips for sale. Either the AMD or > SGS Thompson variety? I have one brand new AM 7911 DC chip which I would willingly donate to help a good cause. If you consider that you are one , then send me a stamped addressed envelope (see my web site) and I will send it back by return post. BTW, I also have a built-up modem from a Wireless World design which uses, I think, a 7910 chip. It is built on their approved PCB and cased with a 240v PSU. It worked when I last used it some years ago. If that is of any interest I am open to offers. ATB - Dave -- David C.Chapman - Chartered Engineer. FIEE. (dave@chassis.demon.co.uk) -------------------------------------------------------------------------- CHAPMAN ASSOCIATES is a Consultancy offering practical expertise and design skills in the fields of counter-surveillance, electronic protection and security. Visit our Web site at http://www.ant.co.uk/~chassis/ -------------------------------------------------------------------------- From lwbyppp@epix.net Fri Feb 09 16:59:52 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!luzskru.cpcnet.com!not-for-mail From: mannd@candw.com.ai (Dave Mann) Subject: 813 Xmtr for 160M Message-ID: <287cc$63336.319@luzskru.cpcnet.com> Date: Thu, 08 Feb 1996 11:50:42 GMT Reply-To: mannd@candw.com.ai X-Newsreader: Forte Free Agent 1.0.82 Lines: 12 I would very much appreciate any advice or opinions about constructing a crystal controlled cw-only transmitter for 160 meters. I have 2 brand new 813's and sockets, lots of other "junk box" parts. My idea is to have a very simple but high power cw transmitter to use for cw QSO's around 1.835mhz. If there is another "window" for 160M that I should use (like for JA's), perhaps I could come up with a 2 crystal design. Thanks in advance es 73's Dave, VP2EHF From lwbyppp@epix.net Fri Feb 09 16:59:53 1996 Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 813 Xmtr for 160M Date: Thu, 08 Feb 96 09:07:54 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 30 Distribution: world Message-ID: <4fdpkf$ve@crash.microserve.net> References: <287cc$63336.319@luzskru.cpcnet.com> NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 mannd@candw.com.ai (Dave Mann) wrote: >I would very much appreciate any advice or opinions about >constructing a crystal controlled cw-only transmitter for 160 meters. >I have 2 brand new 813's and sockets, lots of other "junk box" parts. >My idea is to have a very simple but high power cw transmitter to use >for cw QSO's around 1.835mhz. Can't tell you much about the windows on 160M, but a pair of 813's will provide 1KW input on CW. RCA's recommendation for these tubes was +2,250V on the plate and +400V on the screen. You can either key the cathode of the finals (by means of a center- tapped filament transformer) or the oscillator itself. If you key only the stages ahead of the final, you'll need either a bias supply, about -160V, or a clamper tube in the screen circuit. Alternately, you could use grid-block keying and key the oscillator, driver(s) and final simultaneously (preferred, in my opinion). Depending on the layout, the 813's may or may not need neutralization and/or parasitic suppressors. Also, either push-pull or parallel operation would be fairly easy to implement due to the single-band design. This transmitter will be operating straight-through, so be sure all stages, particularly the oscillator, are well-shielded from the high-level energy at the final. 73, Jack WB3U From lwbyppp@epix.net Fri Feb 09 16:59:54 1996 Path: news.epix.net!news.sprintlink.net!news.voicenet.com!netnews.upenn.edu!msunews!uwm.edu!newsspool.doit.wisc.edu!night.primate.wisc.edu!nntp.msstate.edu!cssun.mathcs.emory.edu!swrinde!newsfeed.internetmci.com!news.msfc.nasa.gov!elroy.jpl.nasa.gov!news From: no6b@no6b.jpl.nasa.gov (Robert Dengler) Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Subject: Re: 82 Repeater in Kansas City/Repeater Use Date: 2 Feb 1996 21:43:49 GMT Organization: Image Analysis Systems Group, JPL Lines: 30 Message-ID: <4eu0il$3ub@elroy.jpl.nasa.gov> References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> <4elgqo$q73@nnrp1.news.primenet.com> Reply-To: no6b@no6b.jpl.nasa.gov (Robert Dengler) NNTP-Posting-Host: 128.149.10.55 X-Newsreader: IBM NewsReader/2 v1.02 Xref: news.epix.net rec.radio.amateur.policy:33021 rec.radio.amateur.antenna:18930 rec.radio.amateur.equipment:24650 rec.radio.amateur.homebrew:13179 rec.radio.amateur.digital.misc:13998 In , rob@pe1chl.ampr.org (Rob Janssen) writes: >In <4elgqo$q73@nnrp1.news.primenet.com> sparkfel@primenet.com (Mark Fellhauer ) writes: > >>rob@pe1chl.ampr.org (Rob Janssen) wrote: > >>>In <310B8C36.5D9@magnum.wpe.com> Eddie Caffray wr ites: > >>>> On the 146.85 repeater here in Central NY we had trouble with one user al so. He made it that >>>>no one would even monitor the reapeater anymore. The club voted to ban him and we did. The >>>>reapeater is a great place to be again. > >>>How do you manage to effectively ban malicious users from a repeater? >>>Of course this problem is known all over the world, but at least over >>>here we have not yet found an effective way of stopping them. How do >>>you do that? > Here's what a local repeater club in So. Cal. did: -Changed the status of their repeater from 'open' to 'private', so that only club members are 'supposed' to use it. -Got a restraining order prohibiting the undesired user from using the repeater. The restraining order was enforced & the undesired user was forced off the repeater, along with lots of 'good' non-member users. Bob NO6B From lwbyppp@epix.net Fri Feb 09 16:59:56 1996 Path: news.epix.net!news.sprintlink.net!news.frontiernet.net!Empire.Net!news.net99.net!news.corpcomm.net!news.gate.net!news.icix.net!news-w.ans.net!newsfeeds.ans.net!newsjunkie.ans.net!chi-news.cic.net!brutus.bright.net!usenet.eel.ufl.edu!gatech!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: guenter.koellner@oen.siemens.DE (Koellner, Guenter) Newsgroups: rec.radio.amateur.homebrew Subject: ? Low-/Bandpass for 144MHz and 432MHz Date: 8 Feb 96 15:55:00 GMT Organization: ucsd usenet gateway Lines: 30 Message-ID: <311A1E19@SmtpGate.Oen1.Oen.Siemens.De> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Hello, I was looking for a long time for designs do built tube amplifiers for 144MHz and 432MHz which are able to carry my GS35B providing some kW output. Now I found suitable and they are just under construction. The days ago I thought about the third harmonics and I think I need some lowpass or bandbass filters. Of course I know that caveties are the best, but they are too heavy. I would need some designs using standard L/C combinations. For the input I need filters which can run with about 200W, so some standard designs could be used. But for the output I need designs which are able to carry 4kW. I remember a design from ON5FF for his 2*3CX800 144MHz amp, he uses heavy silver plated copper tube as inductance and short pieces of semi rigid as capacitances. My question: do you know anything else, especially for 432MHz? NB: A simple calculation told me that if I have say 40dB suppression of the third harmonic and 4kW output it is 0.1W at the harmonic... This should be suppressed additionally about 10-20dB. And: If I have 0.5dB loss that is 435W loss... Some people would be happy if they could reach the power that I would loose, hi. If I allow 100W loss in the output filter thats about 0.1dB and 50W about 0.05dB, so insertion loss should be below 0.1dB vy 73, Guenter, DL4MEA@DB0KCP.#BAY.DEU.EU (AX.25) DL4MEA@AMSAT.ORG (Internet) HTTP://WWW.SCN.DE/~KOELLNER (WWW) From lwbyppp@epix.net Fri Feb 09 16:59:57 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Amplifier Message-ID: <1996Feb8.211649.7499@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4f7g7g$ecl@ns2.emirates.net.ae> Date: Thu, 8 Feb 1996 21:16:49 GMT Lines: 30 In article <4f7g7g$ecl@ns2.emirates.net.ae> bingalib@emirates.net.ae (Sager Bi nghalib) writes: >Hi.... > > I am trying to build an amplifier for the HF BANDS 25-35 mhz >generally..... any one knows how ??? > > Seger Binghalib > > bingalib@emirates.net.ae How much power, and what modulations are you going to amplify? I note you are posting from outside the US, so I won't belabor the Type Acceptance that would be required here since that doesn't apply in your case. But we still need to know how much power you want, the strength of the driving signal, and the type of modulation in order to answer your question properly. In general, you use the same type of circuits commonly used for the lower part of HF, just with some scaling of tuned circuit values. For modest power, up to the 100-200 watt level, the amplifier would commonly be solid state. At higher power levels, vacuum tubes would normally be used (though you can build higher power amplifiers with solid state too). Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Feb 09 16:59:58 1996 Path: news.epix.net!news.sprintlink.net!news.interport.net!imci2!news.internetMCI.com!darwin.sura.net!news.er.usgs.gov!stc06.ctd.ornl.gov!zaek25.ymd.ornl.gov!uid From: uid@ornl.gov Newsgroups: rec.radio.amateur.homebrew Subject: Re: Anyone else read Bowick's RF circuit Design? Date: Thu, 8 Feb 1996 18:54:45 GMT Organization: Oak Ridge National Lab, Oak Ridge, TN Lines: 69 Message-ID: References: NNTP-Posting-Host: zaek25.ymd.ornl.gov X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] In article Ference Kish writes: >Path: stc06.ctd.ornl.gov!fnnews.fnal.gov!uwm.edu!spool.mu.edu!munnari.OZ.AU!n ews.mel.connect.com.au!harbinger.cc.monash.edu.au!ns.saard.net!news.adelaide.e du.au!curlew.mtx.net.au!usenet >From: Ference Kish >Newsgroups: rec.radio.amateur.homebrew >Subject: Anyone else read Bowick's RF circuit Design? >Date: Wed, 07 Feb 96 08:06:53 GMT >Organization: Microtronics Information Systems >Lines: 49 >Message-ID: >NNTP-Posting-Host: attila.mtx.net.au >Mime-Version: 1.0 >Content-Type: TEXT/PLAIN; charset=US-ASCII >X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage >Hi! > I've just started reading Chris Bowick's RF Circuit Design. > I quite like it and recommend it to others, however, there is something tha t > is puzzling me. > On pages 34 and 35 the book discusses the loaded Q of a resonant > circuit; explains the effect of the source and load resistance on > the Q of the tuned circuit. > Where I got a bit confused is Eq 2-6 onward. Bowick says that the > Q of the circuit is > Q = Rp /Xp > where Rp is (Rs * Rl) / (Rs + Rl) and Xp is the inductive/capacitive > reactance, Rs and Rl are source and load resistance respectively. > No worries so far. > Then he goes on saying that if we want to optimize the Q of the tank > circuit with source/load resistance fixed we need to change Xp thru' > the L or C of the circuit. Fair enough. > No comes the tricky bit: He than concludes ( if I've read it correctly ) > that the best way of doing this is by INCREASING the capacitance... > I'm not an expert, I'm just starting of, however, from what I heard and > tried before, it seemed to me that increasing the L is the better way. > I thought the more inductance we have the better the Q of the tuned circuit > will be. > Mathematically he seems correct if one looks at his example: > changing from L=50nH, C=25pF to L=2.5nH and C=500pF @142.35Mhz the Q > > of the second combination seems higher ( load resistance of 50R). > Could someone enlighten me, have I misread anything? > regards, ference, fkish@attila.mtx.net.au You might consider that increaseing the inductance also may increase the series resistance of the coil. Danny From lwbyppp@epix.net Fri Feb 09 17:00:00 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!harbinger.cc.monash.edu.au!ns.saard.net!news.adelaide.edu.au!curlew.mtx.net.au!usenet From: Ference Kish Newsgroups: rec.radio.amateur.homebrew Subject: Anyone else read Bowick's RF circuit Design? Date: Wed, 07 Feb 96 08:06:53 GMT Organization: Microtronics Information Systems Lines: 49 Message-ID: NNTP-Posting-Host: attila.mtx.net.au Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage Hi! I've just started reading Chris Bowick's RF Circuit Design. I quite like it and recommend it to others, however, there is something that is puzzling me. On pages 34 and 35 the book discusses the loaded Q of a resonant circuit; explains the effect of the source and load resistance on the Q of the tuned circuit. Where I got a bit confused is Eq 2-6 onward. Bowick says that the Q of the circuit is Q = Rp /Xp where Rp is (Rs * Rl) / (Rs + Rl) and Xp is the inductive/capacitive reactance, Rs and Rl are source and load resistance respectively. No worries so far. Then he goes on saying that if we want to optimize the Q of the tank circuit with source/load resistance fixed we need to change Xp thru' the L or C of the circuit. Fair enough. No comes the tricky bit: He than concludes ( if I've read it correctly ) that the best way of doing this is by INCREASING the capacitance... I'm not an expert, I'm just starting of, however, from what I heard and tried before, it seemed to me that increasing the L is the better way. I thought the more inductance we have the better the Q of the tuned circuit will be. Mathematically he seems correct if one looks at his example: changing from L=50nH, C=25pF to L=2.5nH and C=500pF @142.35Mhz the Q of the second combination seems higher ( load resistance of 50R). Could someone enlighten me, have I misread anything? regards, ference, fkish@attila.mtx.net.au From lwbyppp@epix.net Fri Feb 09 17:00:01 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!gatech!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!news2.acs.oakland.edu!newshub.gmr.com!oldsuna.gmr.com!cmsa From: ccallewa@cmsa.gmr.com (Clyde) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Anyone else read Bowick's RF circuit Design? Date: Fri, 09 Feb 1996 11:56:18 GMT Organization: General Motors Research and Development Center Lines: 6 Message-ID: <4ffuk5$is5@oldsuna.gmr.com> References: Reply-To: ccallewa@cmsa.gmr.com (Clyde) NNTP-Posting-Host: re3cmc.gmr.com I believe that your equation is for the loss tangent which is 1/Q. "Q" is the ratio stored to dissipated energy, and should be Q=X/R. Clearly X and R give rise to energy stored and dissipated respectively. I think it's a typo in the book. 73', Clyde. From lwbyppp@epix.net Fri Feb 09 17:00:03 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!howland.reston.ans.net!gatech!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Anyone else read Bowick's RF circuit Design? Date: 9 Feb 1996 18:57:16 GMT Organization: Hewlett Packard Corvallis Site Lines: 64 Message-ID: <4fg5ec$88t@hpcvsnz.cv.hp.com> References: NNTP-Posting-Host: hplsnb.lsid.hp.com X-Newsreader: TIN [version 1.1 PL9.4] Ference Kish (fkish@attila.mtx.net.net) asked some questions about understanding Q of a circuit. There have been some good replies, and I'll try not to just repeat what they've written, but maybe a little different viewpoint will also help. You can define Q as the energy stored in a resonator divided by the energy lost per radian of oscillation (or 2*pi*energy stored/energy lost per cycle). That definition of Q is valid for any resonator, be it mechanical, acoustical, lumped-electrical, transmission line, or cavity -- or others. So, in a tank circuit connected to a load (including also resistance in a source if that's appropriate), you can figure the power dissipated in the load(s) by knowing the voltage across the resistive part or the current through the resistive part. From the power and frequency, you can get the energy dissipated per cycle or per radian. (You want the _average_ per radian; don't try to use some particular radian of the cycle, cuz some have less energy dissipated and some more.) And in a lumped element tuned circuit -- L-C circuit -- the energy stored is also pretty easy. The energy "sloshes" back and forth between the L and the C, and twice per cycle essentially all is in the C -- at voltage peaks -- and 90 degrees out of phase with that, twice more, all is in the L, when the capacitor voltage is zero and the inductor current is max. If you know either the max voltage or the max current, you can get the stored energy easily. It's just V(peak)^2 * C / 2, or I(peak)^2 * L / 2. You do have to be careful to understand that that's the peak voltage across the capacitor and the peak current through the inductor -- some circuit configurations can confuse this a little. For example, with series resonance, the voltage across the (L + C) can be very small compared with the voltage across the L or the C individually. OK, in the case Ference mentioned, there is a constant peak voltage, for a constant power dissipated in the net load resistance, since the generator and load are each in parallel across the parallel tank. So, to increase the Q, we need to increase the energy stored in the tank under the same conditions. And we do that by making C bigger, so that the V^2 * C / 2 gets bigger. If instead you had a series circuit of generator, L, C, and load resistor, then for constant power in the load, you no longer easily know what the peak capacitor voltage is. But you do know that the RMS current in the load is constant, and since it's a series circuit, the current in the tank is the same as the load current. NOW it's obvious that you must increase the INDUCTANCE to get higher Q, because that increases I^2 * L / 2. By the way, for most practical inductors, for a given volume and core material, the unloaded coil Q for a good design is quite insensitive to the inductance. That is, if you have an air-core coil 5cm diameter and 10cm long, you can get pretty close to the same Q over perhaps a 100 to 1 range of inductances. That's the unloaded coil Q at a particular frequency, and of course not the same at all as the loaded tank Q discussed above. This just scratches the surface, but I hope this energy-based viewpoint helps out. With it, you can more easily look at other resonant structures and compare and contrast them to the (perhaps) more familiar lumped LC. And you can understand easily the loss in a filter by knowing the unloaded Q of each resonator and its loaded Q... -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Fri Feb 09 17:00:04 1996 Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet From: otterson@mindspring.com (Jeff Otterson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Arizona Microschip Date: Tue, 06 Feb 1996 01:16:03 GMT Organization: MindSpring Enterprises Lines: 24 Message-ID: <4f6b9o$qba@stealth.mindspring.com> References: <4eu5rk$ouh@jusdnews.fir.fbc.com> <4f07e3$me5@newsbf02. <4f3uu1$dr3@news.asu.edu> Reply-To: otterson@mindspring.com NNTP-Posting-Host: otterson.mindspring.com X-Newsreader: Forte Free Agent 1.0.82 ballnt@aztec.asu.edu (John Ballentine) wrote: >In a previous article, cbuttsch@biggulp.callamer.com (Clifford Buttschardt) s ays: >>Recently, I ran across a reference to Arizona Microchip devices which was >>interesting. Does anyone have an address or a clue as what they >>manufacture? I suspect it might be a "STAMP" product but I am not >>sure. They have a development kit available too. >>Cliff Buttschardt W6HDO Morro Bay, Calif >> >This probably refers to Microchip Technology. They make microcontroller >chips and do have several development kits available. I don't have the >address or phone number, but the main offices are here in Chandler, AZ on >Chandler Blvd. Check out http://www.ultranet.com/biz/mchip for all your microchip questions. All the data sheets, development tools and manuals are there, and the price is right! Jeff Otterson ------------- otterson@mindspring.com Maker and user of tools PGP key available at http://www.mindspring.com/~otterson/pgp.htm From lwbyppp@epix.net Fri Feb 09 17:00:06 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!usenet.eel.ufl.edu!psgrain!nntp.teleport.com!ip-pdx02-47 From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Be a Radio Disk Jockey! Date: Fri, 09 Feb 96 09:12:50 GMT Organization: EZNEC Antenna Software Lines: 10 Message-ID: <4ff351$mhg@maureen.teleport.com> References: <4f68c2$p1r@newsbf02.news.aol.com> NNTP-Posting-Host: ip-pdx02-47.teleport.com X-Newsreader: News Xpress Version 1.0 Beta #3 In article <4f68c2$p1r@newsbf02.news.aol.com>, arnd2it@aol.com (ARnd2it) wrote: >Need a Job? Be a Disk Jockey! >. . . > The money is good, the hours are flexible. . . >. . . Wow! Sounds like two things have changed a whole lot since my radio days. Roy Lewallen, W7EL From lwbyppp@epix.net Fri Feb 09 17:00:06 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!edisto.awod.com!harbour.awod.com!usenet From: Russell Wells Newsgroups: rec.radio.amateur.homebrew Subject: Re: Books for Sale Date: 1 Feb 1996 21:56:35 GMT Lines: 2 Message-ID: <4ercuj$ek6@harbour.awod.com> References: <4ehp3l$5sm@bubba.NMSU.Edu> NNTP-Posting-Host: chs0023.awod.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: beard@acca.nmsu.edu still got them let me know "Russ" From lwbyppp@epix.net Fri Feb 09 17:00:07 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!uwm.edu!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!miwok!pacific.net!usenet From: "Mr. Brooke Clarke" Newsgroups: rec.radio.amateur.homebrew Subject: Re: COIL WINDING PROGRAM (freeware Win95 only) Date: 7 Feb 1996 07:36:10 GMT Organization: Rack and Stack Systems Lines: 7 Message-ID: <4f9kpa$64l@pacific.pacific.net> References: <4eeig5$3qv@kryten.awinc.com> <4ennab$ia8@aldebaran.sct.fr> NNTP-Posting-Host: ts-30.pacific.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) To: opworld@worlnet.fr What exactly are you looking for in a "coil winding program". I can give you some simple calculator formulas depending on your needs. Have Fun, Brooke N6GCE From lwbyppp@epix.net Fri Feb 09 17:00:08 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!news.dacom.co.kr!newsrelay.netins.net!imci3!imci4!newsfeed.internetmci.com!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon From: Michael Haydon Newsgroups: rec.radio.amateur.homebrew Subject: Re: controlled carrier AM? Date: Tue, 6 Feb 1996 17:44:43 -0600 Organization: Olivet Nazarene University Lines: 23 Message-ID: References: <4f2s7v$5us@news.calweb.com> NNTP-Posting-Host: tiger.olivet.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4f2s7v$5us@news.calweb.com> What is the purpose of a magnetic shunt? will admit to knowing precious little abt transformer theory. Lots of enthusiasm though. Your further input welcomed. On 4 Feb 1996 billj@calweb.com wrote: > Michael Haydon wrote: > >Read an article in april 1962 qst regarding controlled carrier amplitude > >modulation, YES A.M.!!!. anyone tried this technique? Article was on 40w > >mobile rig. am hoping to put together 300watt or so unit using a pair of > >microwave oven transformers, but am wondwering abt their audio freq. > >response. > >any replies commenting on how much you hate am will be ignored. > > > Check out those transformers before you start. I don't know much about > them but if you look at the iron core you will see a magnetic shunt > between the primary and secondary. Make sure they will do the job > for you before you go too far. > Bill K7NOM > > > From lwbyppp@epix.net Fri Feb 09 17:00:09 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon From: Michael Haydon Newsgroups: rec.radio.amateur.homebrew Subject: Re: controlled carrier AM? Date: Tue, 6 Feb 1996 17:41:36 -0600 Organization: Olivet Nazarene University Lines: 38 Message-ID: References: <4f2srh$7bs@hg.oro.net> NNTP-Posting-Host: tiger.olivet.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4f2srh$7bs@hg.oro.net> 160 and 80 meter ham bands, using method where in modulation is supplied to two sources, one of which is rectified and filter and supplies the Vcc and the other supplies the modulation, system is CLAIMED to provide 100% modulation for any audio input level. using microwave oven transformers because i have two that are identical lying around Thanks for your input and any constructive criricism is welcome. On Sun, 4 Feb 1996, Jim Weir wrote: > Michael Haydon wrote: > > >Read an article in april 1962 qst regarding controlled carrier amplitude > >modulation, YES A.M.!!!. anyone tried this technique? > > Make my living at it. Are you referring to controlled carrier as in > controlling the RF drive to the final stage or controlled carrier as > in supply half the Vcc to the finals through a modulator that then > swings from ground to Vcc? > > > Article was on 40w > >mobile rig. am hoping to put together 300watt or so unit using a pair of > >microwave oven transformers > > On what frequencies, and what does a uwave oven transformer have to do > with it? > > Jim > > > Jim Weir VP Engineering | You bet your sweet patootie I speak > RST Engineering | for the company. I OWN the cotton- > Grass Valley CA 95945 | pickin' company. > voice/fax 916/272-1432 | AR Adv. WB6BHI Cessna 182A N73CQ > rst-engr@oro.net | Comm'l Pilot & CFI Airplane/Glider A&P Mechanic > > > From lwbyppp@epix.net Fri Feb 09 17:00:10 1996 Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!nntp.inet.fi!news.tele.fi!news.csc.fi!news.eunet.fi!EU.net!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!in2.uu.net!nntp.crl.com!pacbell.com!unet.net.com!loren!larson From: larson@loren.net.com (Alan Larson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: controlled carrier AM? Date: 7 Feb 1996 22:46:20 GMT Organization: n.o.n.e. Lines: 13 Message-ID: <4fba3s$8c0@unet.net.com> References: <4f2srh$7bs@hg.oro.net> NNTP-Posting-Host: loren.net.com In article <4f2srh$7bs@hg.oro.net> rst-engr@oro.net (Jim Weir) writes: >Make my living at it. Are you referring to controlled carrier as in >controlling the RF drive to the final stage or controlled carrier as >in supply half the Vcc to the finals through a modulator that then >swings from ground to Vcc? How does this latter choice differ from being essentially plate (collector) modulation? Alan From lwbyppp@epix.net Fri Feb 09 17:00:12 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: controlled carrier AM? Date: 3 Feb 1996 13:01:45 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 52 Sender: root@newsbf02.news.aol.com Message-ID: <4f07u9$mkr@newsbf02.news.aol.com> References: NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article , Michael Haydon writes: >Read an article in april 1962 qst regarding controlled carrier amplitude >modulation, YES A.M.!!!. anyone tried this technique? Article was on 40w >mobile rig. am hoping to put together 300watt or so unit using a pair of >microwave oven transformers, but am wondwering abt their audio freq. >response. >any replies commenting on how much you hate am will be ignored. > > Controlled carrier AM has the same fidelity as any other AM system, they are all limited by the skill of the designer. The idea of controlled carrier AM is to reduce dissipation between words. So it allows the PA to be used at it's PEP rating rather than it's continious dissipation rating. You have to be careful to increase the carrier *before* the modulation increases, and decrease it *after* the modulation decreases. You can use controlled carrier with control grid, screen, cathode, or plate modulation. In my view, it's just one more thing to go wrong for the small increase in power it provides. For example, a 100 watt dissipation PA capable of 800 watts PEP can operate at more than 200 watts carrier output in plate modulated class C voice operation. That's because efficiency can be well over 70%. (RCA made a plate modulated AM BCB transmirtter that had 90% plus carrier eff) The same PA can only operate at 50 watts AM carrier output (200 watts PEP) in linear or grid modulated service, because the efficiency is restricted to 33% or less. With controlled carrier, in theory each PA can operate at the maximum 800 PEP during modulation peaks of short duration with a long cooling off time in between, but the real world result of normal modulation duty cycles limit it to a figure more like 400 watts PEP (100 watts carrier). So you gain 3 dB for a *LOT* of grief in adjustments. A better solution is to reduce the carrier. The weak carrier can be filtered and amplified in the receiver and re-injected with the audio sidebands. Or another carrier can be generated and re-injected in the receiver. This modulation scheme also can be arranged to remove signal from one sideband and add it to the other, allowing narrower receiver BW and improved S/N ratios.You can do this easily in the PA by adding phase shift to the carrier and audio signals, or by a modulator/filter scheme. I use this system all the time. If you tune around, you will find other experimenters using it. 73 Tom From lwbyppp@epix.net Fri Feb 09 17:00:13 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dec QEX "construction article??" Date: 5 Feb 1996 16:22:41 GMT Organization: Dover Research Corp. Lines: 9 Message-ID: <4f5ash$e3t$6@mhadg.production.compuserve.com> I thought a software listing was important for my May piece but I've been convinced that any listings will turn off a large segment of the people who read QST. Many guys see computer listings and really get upset. And as noted the complete source with comments is available for download. And believe me this is how you want users to get it. Just look at all my typos for the reason why A flowchart? Humm that might not be a bad idea (That was my editor socking my head for saying that) -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Fri Feb 09 17:00:14 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!news.mind.net!chi-news.cic.net!newsfeed.internetmci.com!gatech!news.jsums.edu!news.uoregon.edu!news.u.washington.edu!uw-beaver!uw-coco!nwnews.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dec QEX "construction article??" Date: Thu, 01 Feb 96 16:51:19 PDT Organization: Northwest Nexus Inc. Lines: 33 Message-ID: References: <4eoq1i$c8t@newsgate.sps.mot.com> NNTP-Posting-Host: blv-pm1-ip14.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage In article <4eoq1i$c8t@newsgate.sps.mot.com>, writes: > We included in the article 100% of the board schematics -- what we > omitted was the 179 page software listing, which was obviously > inappropriate anyway. > > The design includes a DDS which is controlled either from a knob > or a keypad, and includes switching control to support anyone's > RF modules to make up to a 10-band radio. > > The bulk of the article most certainly is NOT a "kit review" as > > 73, > > Tim, WA5VQK and Rand, W1GXN > > > I Beg to differ, the schematic of a dedicated microprocessor is trivial compared to the software that operates it. Even if you don't feel that the entire program can be included, a complete and detailed flow diagram can be. In addition there are sites available including the arrl web page where additional files can be downloaded for those that are interested. 73 de KI7RH Jay Wicklund From lwbyppp@epix.net Fri Feb 09 17:00:15 1996 Path: news.epix.net!uunet!in2.uu.net!spool.mu.edu!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: EFBRYA@acxiom.COM Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dec Qex "construction article??" Date: 2 Feb 96 14:08:48 GMT Organization: ucsd usenet gateway Lines: 24 Message-ID: <1121ae50@acxiom.com> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu I think a good compromise would be to put the software listing on the net somewhere and on a dial up BBS. Anyone who is going to do their own programming has got to have a PC and should be able to get a modem (even an old 1200/2400 baud!). If they subscribe and desire to do so they could download and print the software and keep it with the magazine. Anyone trying to build it after 3-5 years might have to recreate the software unless it made its way to some of the Ham CDs. The same could be done for board layouts using .pdf format. (Boy that'll start a flaming thread...) I would characterize the article as "construction" as it had full schematics and circuit descriptions. I would characterize it as useful because of what it contained. That does not mean it could not be more useful by including the parts that were omitted! It was a more useful article than the antenna tuner (very personal opinion). Eric Bryan KC5EBY From lwbyppp@epix.net Fri Feb 09 17:00:16 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dummy Load Date: 5 Feb 1996 16:23:32 GMT Organization: Dover Research Corp. Lines: 4 Message-ID: <4f5au4$e3t$7@mhadg.production.compuserve.com> Carbon resistors are around for that low output. And it depends on your output freq. -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Fri Feb 09 17:00:17 1996 Path: news.epix.net!news.sprintlink.net!dfw.nkn.net!news.startext.net!news From: wi5s@startext.net (Charles Knight) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dummy Load Date: 5 Feb 1996 23:27:40 GMT Organization: StarText department of the Fort Worth Star Telegram Lines: 14 Message-ID: <4f63pc$85k@lepton.startext.net> References: <4f3h22$9no@linet02.li.net> NNTP-Posting-Host: dial3.startext.net Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 I'm about to complete a small transmitter and need something to use as >a dummy load... A #47 pilot lamp bulb works fairly well. On most SeaLand ships, the HF RF is passed through a couple of 100 watt household bulbs which offer lightening protection. It is crude, but it works well. Of course, at 2 watts, a 52 ohm resistor will work well. In fact, it will work up to about 5 watts intermittant duty as long as it's carbon as most 2 watts and less are. You could also parallel several larger resistors and get away with it. At HF and even lower VHF frequencies, it is not too critical. Radio shack sells a dummy load of about 15 or 20 watts, but that costs about $20.00 and really isn't necessary. From lwbyppp@epix.net Fri Feb 09 17:00:18 1996 Path: news.epix.net!news.sprintlink.net!ratty.wolfe.net!news.aa.net!tsunami.ixa.net!news.ironhorse.com!sloth.swcp.com!tesuque.cs.sandia.gov!SantaFe!usenet From: Jim Potter Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dummy Load Date: Mon, 05 Feb 1996 07:10:11 -0800 Organization: JP Accelerator Works, Inc. Lines: 28 Message-ID: <31161DD3.18BF@jpaw.com> References: <4f3h22$9no@linet02.li.net> NNTP-Posting-Host: dial130.roadrunner.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6b (Win16; I) To: Thom Thom wrote: > > Hi and thanks in advance for your help, > > I'm about to complete a small transmitter and need something to use as > a dummy load...The rig should put out about 2 or 3 watts so I was snip.... If you have any suggestions as to the what's readiliy available, and of > course economical (!), I'd appreciate your help > > tnx es 73 > de > Tom > WB2QDG A few 2 W (or 1 W) carbon composition resistors in parallel (say two 100 ohms, 2 W) will fix you up. Use short leads and don't expect perfection at 144 MHz, but it will be adequate for most transmitter testing. Ask your friends to look in their junk boxes. These resistors are now a couple of dollars each, with a minimum order of 25 from Newark. de K9GXC, Jim From lwbyppp@epix.net Fri Feb 09 17:00:19 1996 Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!news.sics.se!news.funet.fi!news.eunet.fi!EU.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!li.net!thom From: thom@newshost.li.net (Thom) Newsgroups: rec.radio.amateur.homebrew Subject: Dummy Load Date: 4 Feb 1996 23:55:46 GMT Organization: LI Net (Long Island Network) Lines: 19 Message-ID: <4f3h22$9no@linet02.li.net> NNTP-Posting-Host: linet01.li.net X-Newsreader: TIN [version 1.2 PL2] Hi and thanks in advance for your help, I'm about to complete a small transmitter and need something to use as a dummy load...The rig should put out about 2 or 3 watts so I was thinking of a power resistor. However, it is my understanding that a wire-wound resistor will not work with RF due to the inductance it will produce. If you have any suggestions as to the what's readiliy available, and of course economical (!), I'd appreciate your help tnx es 73 de Tom WB2QDG thom@li.net From lwbyppp@epix.net Fri Feb 09 17:00:20 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dummy Load Date: 7 Feb 1996 08:41:05 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 35 Sender: root@newsbf02.news.aol.com Message-ID: <4faa5h$de9@newsbf02.news.aol.com> References: <31161DD3.18BF@jpaw.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <31161DD3.18BF@jpaw.com>, Jim Potter writes: > >A few 2 W (or 1 W) carbon composition resistors in parallel (say two 100 >ohms, 2 W) will fix you up. Use short leads and don't expect perfection >at 144 MHz, but it will be adequate for most transmitter testing. Ask >your friends to look in their junk boxes. These resistors are now a >couple of dollars each, with a minimum order of 25 from Newark. > >de K9GXC, Jim > > Hi All, Everything thing Jim says is true, but I want to add a little bit. We had a big discussion about this a few months ago. True non-inductive carbon and metal resistors are very rare, and the one and two waatters can be very reactive at VHF and UHF. Our plant goes directly to Allen-Bradley for them and pays about $.30 each for non-inductive carbon comps in 5000 lots. Just because the resistor is carbon or metal based (rather than wire wound) it does not mean it's "non-inductive". As a matter of fact, even if the resistor specs say "non-inductive" it may not be suitable for some RF applications. Non-inductive is a very nebulous term. Cut a sample resistor open and examine the insides (or measure it on a good analyzer). If it uses a ceramic core with a metal or carbon spiral for the resistance element....it is inductive. If it is made that way (and nearly off shelf units are) it may be ok for a load, or it may not. It will likey be very poor in a critical load like a parasitic supressor. 73 Tom From lwbyppp@epix.net Fri Feb 09 17:00:21 1996 Path: news.epix.net!news.sprintlink.net!quiknet3.quiknet.com!calweb!jolt.pagesat.net!pagesat.net!news.uoregon.edu!news.orst.edu!engr.orst.edu!reuter.cse.ogi.edu!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!agate!boulder!spot.Colorado.EDU!tiemann From: tiemann@spot.Colorado.EDU (TIEMANN BRUCE) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dummy Load Date: 7 Feb 1996 19:32:10 GMT Organization: University of Colorado, Boulder Lines: 13 Message-ID: <4faunq$avs@peabody.colorado.edu> References: <4f3h22$9no@linet02.li.net> <4f87so$bd8@newsgate.sps.mot.com> NNTP-Posting-Host: spot.colorado.edu From Jim Strohm@ausq1ak Wed Feb 7 12:22:29 MST 1996 >[snip] >These dummy loads work well past VHF frequencies and handle 2 watts >[snip] ^^^^^^^^^^^^^^^ >OK, everybody flame me now. N6OTQ I'll bite... "VHF frequencies" = very high frequency frequencies Bruce, N6URH From lwbyppp@epix.net Fri Feb 09 17:00:23 1996 Path: news.epix.net!news.sprintlink.net!nuclear.microserve.net!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dummy Load Date: Fri, 09 Feb 96 06:34:34 GMT Organization: Microserve Information Systems (800)-380-INET Lines: 20 Distribution: world Message-ID: <4fg515$5ou@crash.microserve.net> References: <4f3h22$9no@linet02.li.net> <4f87so$bd8@newsgate.sps.mot.com> <4faunq$avs@peabody.colorado.edu> NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 tiemann@spot.Colorado.EDU (TIEMANN BRUCE) wrote: >>These dummy loads work well past VHF frequencies and handle 2 watts >>OK, everybody flame me now. N6OTQ >I'll bite... >"VHF frequencies" = very high frequency frequencies Actually, the first post was correct. The phrase "Very High Frequency" (abbreviated as "VHF") is an adjective. Despite the fact that we often treat it as a noun, such use is grammatically incorrect. "VHF" must be followed by the object it modifies, such as "band", "frequency", "transmitter", "antenna", etc. Now, who can find the error in this sentence: "I are a nit-picker." :) 73, Jack WB3U From lwbyppp@epix.net Fri Feb 09 17:00:24 1996 Path: news.epix.net!news.sprintlink.net!news.interport.net!imci2!news.internetMCI.com!darwin.sura.net!babylon5.ccd.harris.com!not-for-email From: dsnowden@ccd.harris.com (Doug Snowden) Newsgroups: rec.radio.amateur.homebrew Subject: FS: HyGain TH-3, near new Date: 8 Feb 1996 09:14:04 -0500 Organization: Harris Controls Division Lines: 18 Message-ID: <4fd0fc$8ghs@rs2.ccd.harris.com> NNTP-Posting-Host: rs2.ccd.harris.com X-Newsreader: TIN [version 1.2 PL2] This antenna was up last field day for the weekend, and has never seen any other service. I have a spare trap, the instruction manual, a few spare trap end caps, and asst. hardware. It is presently partially assembled (elements and boom). I can leave it that way to save a person the trouble of re-assembling it. This is in very good shape. I bought it from a guy that had stored it in his garage and never assembled it. I am getting rid of it because I don't have room for it on the tower. I presently have a 3 el 20m monobander up. Meet me at the Orlando hamfest 17-18 February, or other arrangements. $125 Doug, N4IJ dsnowden@ccd.harris.com Palm Bay, Florida (407) 984-9360 after 6pm est -- Doug Snowden dsnowden@ccd.harris.com From lwbyppp@epix.net Fri Feb 09 17:00:25 1996 Path: news.epix.net!news.sprintlink.net!news.interport.net!imci2!news.internetMCI.com!darwin.sura.net!babylon5.ccd.harris.com!not-for-email From: dsnowden@ccd.harris.com (Doug Snowden) Newsgroups: rec.radio.amateur.homebrew Subject: FS: Monster Amplifier Plate Transformer Date: 8 Feb 1996 09:08:03 -0500 Organization: Harris Controls Division Lines: 17 Message-ID: <4fd043$976p@rs2.ccd.harris.com> NNTP-Posting-Host: rs2.ccd.harris.com X-Newsreader: TIN [version 1.2 PL2] I am re-building my 3-1000 amplifier into a table-top cabinet and am rebuilding the power supply also. I am getting rid of the plate transformer. It is built for Gates Radio and is about 6,600 volts @ 1 amp, or 3,300 volts @ 2 amps. I use it at 3300v for a 3-1000. This brute weighs probably 80 to 90 pounds and is about 18" X 9" X 20" high. Asking $100. I'll drive an hour or two to meet you. Or you can pick it up and see it in service first. If you are planning on going to the Orlando hamfest the weekend of 17 February, I can meet you there. Doug, N4IJ dsnowden@ccd.harris.com Palm Bay, Florida (407) 984-9360 after 6pm est -- Doug Snowden dsnowden@ccd.harris.com From lwbyppp@epix.net Fri Feb 09 17:00:26 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.west.net!term2-10 From: rondoc@west.net (Ronald Doctors) Newsgroups: rec.radio.amateur.homebrew Subject: GARAGE CLEAR OUT Date: Tue, 06 Feb 96 17:16:25 GMT Organization: West.Net Communications Lines: 3 Message-ID: <4f82d9$a5o_001@sb.west.net> NNTP-Posting-Host: term2-10.sb.west.net X-Newsreader: News Xpress Version 1.0 Beta #4 look at http://www.west.net/~rondoc/clearall I have some old tek scopes and project boxes plus loads of new small 120-240 - low volst transformers let me know I may have what you need. From lwbyppp@epix.net Fri Feb 09 17:00:27 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!info.ucla.edu!library.ucla.edu!galaxy.ucr.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: hts@thor.NET Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ham-Homebrew Digest V96 #28 Date: 1 Feb 96 17:54:10 GMT Organization: ucsd usenet gateway Lines: 13 Message-ID: <199602011754.LAA09306@odin.thor.net> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu <---- Begin Forwarded Message ----> From: hts@thor.net Subject: Re: Ham-Homebrew Digest V96 #28 To: Ham-Homebrew@UCSD.EDU I want to make a homepage. I don't know how? Where can I read in the internet that teach how to construct a home page? KC5RBM. <---- End Forwarded Message ----> From lwbyppp@epix.net Fri Feb 09 17:00:28 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!sierra.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!news.ios.com!usenet From: Walt W., dfheli@gramercy.ios.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ham-Homebrew Digest V96 #28 Date: 5 Feb 1996 14:09:14 GMT Organization: Internet Online Services Lines: 47 Message-ID: <4f532a$bn1@news.ios.com> References: <199602011754.LAA09306@odin.thor.net> NNTP-Posting-Host: ppp-3.ts-2.la.idt.net X-Newsreader: SPRY News 3.03 (SPRY, Inc.) Hello KC5RBM, Use a web crawler to search for the info you need. A really good search engine that I have found is run by DEC and is called SuperSpider, at URL: http://altavista.digital.com I would suggest that you use the keywords "HTML" AND " Web Page", Try the above string. There are so many sources that it is difficult to list them. A very good book can be had at BookStar book stores for around $25, "HTML Publishing on the Internet", by Heslop & Budnick, and is published by Vantena Press. ISBN1-56604-229-1. In addition to learning to write in HTML which is the language of web page/home page construction, you might also consider CGI and later Perl. Good luck, 73's Walt Williams dfheli@gramercy.ios.com > hts@thor.NET writes: > > > <---- Begin Forwarded Message ----> > From: hts@thor.net > Subject: Re: Ham-Homebrew Digest V96 #28 > To: Ham-Homebrew@UCSD.EDU > > I want to make a homepage. I don't know how? Where can I read in the intern et > that teach how to construct a home page? > > KC5RBM. > <---- End Forwarded Message ----> > > >>>> From lwbyppp@epix.net Fri Feb 09 17:00:28 1996 Path: news.epix.net!news.sprintlink.net!news.azstarnet.com!usenet From: Buster Newsgroups: rec.radio.amateur.homebrew Subject: HELP FT-225 or 221 AM Rx Improvement Date: 7 Feb 1996 17:56:17 GMT Organization: http://aimnet4.aimnet.com/~scot/jensens.html Lines: 8 Message-ID: <4fap41$9ki@news.azstarnet.com> NNTP-Posting-Host: usr7ip7.azstarnet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Anybody know a modification for the FT-225 or 221 to improve AM reception? Please respond via e-mail Buster, KC7KMJ lathrop@azstarnet.com From lwbyppp@epix.net Fri Feb 09 17:00:30 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!overload.lbl.gov!news.emf.net!gatech!newsfeed.internetmci.com!chi-news.cic.net!ddsw1!news.mcs.net!news.enteract.com!delta.misha.net!news From: msimon@rworld.com (M Simon) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help With MOV's Date: Wed, 07 Feb 1996 07:20:11 GMT Organization: Space-Time Productions Lines: 27 Message-ID: <4f9jkr$9iu@delta.misha.net> References: <4d5d0k$8vm@newsbf02.news.aol.com> <4d7lvt$cea@newsbf02.news.aol.com> <1996Jan13.104606.4572@ke4zv.atl.ga.us> <4e9pvl$si0@oskgw.osk.sony.co.jp> <4f1eqp$do7@news1.goodnet.com> NNTP-Posting-Host: 206.230.95.11 X-Newsreader: Forte Free Agent 1.0.82 ecloud@goodguy (Shawn Ruttledge) wrote: >While we're on the subject, can anybody identify this MOV (at least I think >it's an MOV): >ZNR >14K201U >U 46 >It's black, shiny, looks like a disc cap but is a bit too thick to be one of >those, and I can see through the coating that the leads bend and go to the >center of the material. I'd like to find out what the joule rating is for th ese >- maybe they'd be useful. I got a bunch of them in a Circuit Specialists >mystery box. My meter says the capacitance is 878 pF. >-- > _______ KB7PWD @ KC7Y.AZ.US.NOAM ecloud@goodnet.com > (_ | |_) html: http://www.goodnet.com/~ecloud > __) | | \__________________________________________________________________ >* OO * Khoros * Linux * robotics * techno * Gravis Ultrasound * X window * Check the Digikey catalog. Look for equivalent sizes. Also do a leakage check to find out at what voltage they 'zener.' 1mA of current vs voltage. Simon From lwbyppp@epix.net Fri Feb 09 17:00:30 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!news1.isp.net!imci4!newsfeed.internetmci.com!howland.reston.ans.net!newsjunkie.ans.net!prodigy.com!usenet From: SJJK62A@prodigy.com (K Short) Newsgroups: rec.radio.amateur.homebrew Subject: HTX-202, HTX-404 external mic mod Date: 5 Feb 1996 17:35:18 GMT Organization: Prodigy Services Company 1-800-PRODIGY Lines: 6 Distribution: world Message-ID: <4f5f4m$p9o@useneta1.news.prodigy.com> NNTP-Posting-Host: inugap3.news.prodigy.com X-Newsreader: Version 1.2 There is a mod to overcome the weak external mic audio problem of the HTX-202 and 404 rigs. Check out : http://pages.prodigy.com/CA/LA/htx202htx404/htx202htx404.html From lwbyppp@epix.net Fri Feb 09 17:00:31 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!news2.net99.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Interface information for LCD display Date: 7 Feb 1996 16:10:38 GMT Organization: Dover Research Corp. Lines: 11 Message-ID: <4faitu$7ll$2@mhafn.production.compuserve.com> I'm not sure but I'm pretty sure that this type of display works a lot like a TTY unit. Simple ASCII in (with some command handshaking) and you get text. Everyone everywhere appears to use the same chipset which is (I tink) the same ones you mentioned. I've written some assembler programs to drive them from a printer port. The printer port works on except in the 4 bit mode (for unknown reasons) but it lets you try things out. Note that the Doc for these things is awful hard to digest. Working code is worth it weight in gold so when you get depressed E-Mail me or better yet send a SASE and I will slip you a disk. Oh better yet send the disk! -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Fri Feb 09 17:00:32 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!news.internetMCI.com!newsfeed.internetmci.com!in2.uu.net!services.arn.net!usenet From: franko@arn.net (Frank M.) Newsgroups: rec.radio.amateur.homebrew Subject: Kenwood TS120S MOD NEEDED! Date: Tue, 06 Feb 1996 00:57:53 GMT Organization: ARNet, Inc. Lines: 6 Message-ID: <4f691r$cno@services.arn.net> NNTP-Posting-Host: arnet-209.arn.net X-Newsreader: Forte Free Agent 1.0.82 I need to find a mod for the Kenwood TS120S for wide recieve, if one exist. Please post or e-mail me. Thanks N5ZLT From lwbyppp@epix.net Fri Feb 09 17:00:33 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!swrinde!sgigate.sgi.com!news.corp.sgi.com!inn From: Jim Fellows Newsgroups: rec.radio.amateur.homebrew Subject: Kits, where to find Date: 6 Feb 1996 22:11:39 GMT Organization: Silicon Graphics, Inc. Lines: 7 Message-ID: <4f8jmr$sde@murrow.corp.sgi.com> NNTP-Posting-Host: zoinks.corp.sgi.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12IS (X11; I; IRIX 6.2-ALPHA-1232561832 IP22) X-URL: news:rec.radio.amateur.homebrew Subject pretty much says it all. I'm looking for sources of good quality kits for VHF/UHF amplifiers, preamps and transverters. Thanks, Jim From lwbyppp@epix.net Fri Feb 09 17:00:34 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!nntp.coast.net!news00.sunet.se!sunic!news99.sunet.se!erinews.ericsson.se!eua.ericsson.se!news.algonet.se!usenet From: cj@algonet.se (Christer Johansson) Newsgroups: comp.robotics.misc,comp.home.automation,sci.electronics,sci.electronics.misc,rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: L.O.S.A Contribution Form Date: Tue, 06 Feb 1996 17:11:28 GMT Organization: HTH Lines: 72 Message-ID: <4f827k$kbf@prometheus.algonet.se> Reply-To: cj@algonet.se NNTP-Posting-Host: sophocles.algonet.se X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net comp.robotics.misc:3008 comp.home.automation:14049 sci.electronics.misc:1151 rec.radio.amateur.homebrew:13187 rec.radio.amateur.misc:97825 List Of Stamp Applications (L.O.S.A for short) ============================================== If you have done something with the BASIC Stamp (big or small) that you are willing to tell others please use the form below and write a short description, nothing fancy is needed just a simple explanation. If you have source code to share that's even better but it's not necessary. Then e-mail the form to: cj@algonet.se With the following as the subject: L.O.S.A Contribution Or you could point your Web-browser to the following URL and fill in the L.O.S.A form on the Web-page... http://www.algonet.se/~cj/losa.html The latest version of L.O.S.A is going to be posted to the following mailing lists and news groups, I will update it approx. once a month. Mailing lists: BASIC Stamp Mailing List News groups: comp.robotics.misc comp.home.automation sci.electronics sci.electronics.misc rec.radio.amateur.homebrew rec.radio.amateur.misc [--- cut ---] ====================================================================== - L.O.S.A Contribution Form - ====================================================================== New Contribution [ ] Update [ ] ---------------------------------------------------------------------- Title : Author: Date: E-mail: (optional) ---------------------------------------------------------------------- Stamp model : BASIC Stamp/BS1-IC/BS2-IC Code available: YES/NO Filename : (optional) URL : (optional) ---------------------------------------------------------------------- Description : (5-50 rows describing your application) ====================================================================== [--- cut ---] If you think something are missing in the "L.O.S.A Contribution Form" please let me know and I will add it. Regards, /Christer From lwbyppp@epix.net Fri Feb 09 17:00:36 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: stevebragg@aol.com (SteveBragg) Newsgroups: sci.electronics.components,rec.radio.amateur.homebrew Subject: Re: MIL VCO Date: 7 Feb 1996 11:27:31 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 36 Sender: root@newsbf02.news.aol.com Message-ID: <4fajtj$g13@newsbf02.news.aol.com> References: <4el6f3$r7h@aldebaran.sct.fr> Reply-To: stevebragg@aol.com (SteveBragg) Xref: news.epix.net sci.electronics.components:2046 rec.radio.amateur.homebrew:13222 Sir (name not given), Avantek is the correct name. They have since sold out to Hewlett-Packard, and given up the VCO business. I've used the Avantek VCO's for 3.5 GHz, and they're really nice and linear. Sigh. Oh, well, there are other sources. The engineering company I work for uses such VCO's, and here are a couple places we get them: Z-COMM 9939 Via Parar San Diego, CA 92126 (619) 621-2700 Mini-Circuits Div. of Scientific Components P.O. Box 350166 Brooklyn, NY 11235-0003 (718) 934-4500 I'm not sure what freq range you're looking for, but both of these companies provide high-quality linear VCO's from about 150 MHz to at least 3.5 GHz. I personally have used the Z-COMM parts for 1296 MHz weak-signal work, and they're relatively cheap ($10-$24 as of about 1 year ago). The Z-COMM folks were really friendly and willing to sell me only one VCO (which some places like Mini-Circuits won't do). Call them for a catalog. Mini-Circuits has stuff to 1240 MHz, for less than $20. Best of luck! 73, Steve Bragg, KA9MVA http://members.aol.com/SteveBragg/private/ka9mva From lwbyppp@epix.net Fri Feb 09 17:00:37 1996 Path: news.epix.net!news.sprintlink.net!snunews.snu.ac.kr!usenet.kornet.nm.kr!usenet.hana.nm.kr!usenet.seri.re.kr!news.kreonet.re.kr!news.dacom.co.kr!nntp.coast.net!howland.reston.ans.net!ix.netcom.com!netnews From: ke6tgn@ix.netcom.com(Wanda M Desmond ) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,sci.electronics.design Subject: Modify cell phone to transceiver? Date: 5 Feb 1996 09:26:53 GMT Organization: Netcom Lines: 12 Message-ID: <4f4igt$3t@reader2.ix.netcom.com> References: <4d5d0k$8vm@newsbf02.news.aol.com> <4d7lvt$cea@newsbf02.news.aol.com> <1996Jan13.104606.4572@ke4zv.atl.ga.us> <4e9pvl$si0@oskgw.osk.sony.co.jp <4f1eqp$do7@news1.goodnet.com> <4f37f9$i0b@harbour.awod.com> NNTP-Posting-Host: bak-ca1-08.ix.netcom.com X-NETCOM-Date: Mon Feb 05 1:26:53 AM PST 1996 Xref: news.epix.net rec.radio.amateur.homebrew:13178 rec.radio.amateur.equipment:24647 sci.electronics.design:2456 Seems I've read on one of the newsgroups a while back of modifying a cell phone into a transceiver. I picked up a couple of Motorola cell phones for next to nothing at a "junk" store the other day thinking they were transceivers (the handset was missing so I didn't know exactly what they were ). Anyone know if this is possible? And how do you go about it? Thanks for any help you can give me! John KE6TGN From lwbyppp@epix.net Fri Feb 09 17:00:38 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.westnet.com!usenet From: jpryan@westnet.com (James P. Ryan) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc Subject: Re: Morse code to text display wanted Date: 7 Feb 1996 15:09:27 GMT Organization: WestNet Internet Services Lines: 34 Message-ID: <4fafb7$ja0@mycroft.westnet.com> References: <4du55d$irl@sue.cc.uregina.ca> <4e11t1$1om@cloner2.ix.netcom.com> NNTP-Posting-Host: port3.ts2.westnet.com X-Newsreader: NeoLogic News for OS/2 [version: 4.2 UNREGISTERED 29 days remaining] Xref: news.epix.net rec.radio.amateur.homebrew:13226 rec.radio.amateur.equipment:24767 rec.radio.amateur.digital.misc:14042 There are two more programs that I am aware of. The first was published in 73 magazine with source it is called ROBOCOPY. This one is a copy/read only program with source in "C". I have also used a program called CW version 1.04 based on the robocopy program. This one was written by W0NFU, has no source code with it, runs on an IBM PC. Both of these programs require a seperate interface to your HF rig. N2IKO >>> In message - Ference Kish writes: :> :> :>> > :>> >Hi. My dad is a Ham operator, and asked me if there were some :>> inexpensive :>> >way to have incoming Morse code automatically translated and displayed :>> on :>> >a CRT. Since I know nothing about Ham radio, I thought I'd post here. :> :>There is a program called MORSEFFT which you should be able to find on the n et :>(use ARCHIE to find the site storing it ) :> :>It needs a sound blaster card as an input device. It comes with C source cod e, :>too :> :> From lwbyppp@epix.net Fri Feb 09 17:00:39 1996 Path: news.epix.net!news.sprintlink.net!con-nntp-gw!news.sprintlink.net!newsfeed.internetmci.com!news.pe.net!news.corpcomm.net!maggie.ionsys.com!newspeak.ultratech.net!worldlinx.com!onlink3.onlink.net!usenet From: firstgen@onlink.net Newsgroups: rec.radio.amateur.homebrew Subject: Need Manual for Hallicrafter s.w. Date: 3 Feb 1996 03:12:19 GMT Organization: Ontario Northland--ONLink Lines: 7 Message-ID: <4eujqj$fe6@onlink3.onlink.net> NNTP-Posting-Host: nrba1_onlink14.onlink.net X-Newsreader: SPRY News 3.03 (SPRY, Inc.) I need a service manual for the Hallicrafters Radio model TW 2000 this is an all band short wave radio made in the late 40s or early 50s and I beleive that it was made in Canada. I have two of them and both need work but the manual is needed in order to do the job right. Can anyone help? Neil From lwbyppp@epix.net Fri Feb 09 17:00:40 1996 Path: news.epix.net!news.sprintlink.net!news.texas.net!newshost.comco.com!news.tamu.edu!news.utdallas.edu!news01.aud.alcatel.com!gatech!purdue!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!usenet.continental.com!usenet From: Paul Christensen Newsgroups: rec.radio.amateur.homebrew Subject: NP0 vs. C0G Capacitors Date: 6 Feb 1996 22:55:47 GMT Organization: Continental Cablevision Lines: 12 Message-ID: <4f8m9j$ddp@usenet.continental.com> NNTP-Posting-Host: 169.152.167.74 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) I'm seeing conflicting information on the technical specifications (i.e., temperature coefficient) of NP0 and C0G capacitors. Some sources indicate they're identical; others show slight percentage differences between the two. Is there a formal EIA specification for these two types? Jordan's "Reference Data for Engineers," seventh edition lists ceramic capacitors in their respective EIA classes but not in terms of a three digit designator. -Paul, N9AZ From lwbyppp@epix.net Fri Feb 09 17:00:41 1996 Path: news.epix.net!news.sprintlink.net!chaos.aoc.nrao.edu!newshost.nmt.edu!rutgers!fdurt1.fdu.edu!xyzzy.bubble.org!newshost.cyberramp.net!news.onramp.net!newshost.convex.com!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: cooperjim@aol.com (CooperJim) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Opinions - Ramsey SX-20 Date: 4 Feb 1996 03:43:19 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 13 Sender: root@newsbf02.news.aol.com Message-ID: <4f1rj7$bv0@newsbf02.news.aol.com> References: <4e6fps$2d8@news1.usa.pipeline.com> Reply-To: cooperjim@aol.com (CooperJim) NNTP-Posting-Host: newsbf02.mail.aol.com I built one a couple of years ago. It worked well and heard plenty signals with about 20 feet of wire. It took only an evening and the manual was easy to follow. It describes the function of the components as you put them in so its a good learning experience. I just sent the 40 meter receiver kit as a gift for my nephew so he can pick up W1AW from Phila. The tuning with the single variable resistor is too broad. Put in the bandspread one suggested in the manual. 73 Jim Cooper NE6O CooperJim@aol.com From lwbyppp@epix.net Fri Feb 09 17:00:42 1996 Path: news.epix.net!uunet!in1.uu.net!gatech!newsxfer2.itd.umich.edu!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon From: Michael Haydon Newsgroups: rec.radio.amateur.homebrew Subject: Re: phone patch project Date: Sat, 3 Feb 1996 11:48:33 -0600 Organization: Olivet Nazarene University Lines: 14 Message-ID: References: <4euk48$4ju@news.chattanooga.net> NNTP-Posting-Host: tiger.olivet.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4euk48$4ju@news.chattanooga.net> Try Mendelsons Electronic Surplus in Dayton, Ohio. Their # 1-800-344-4465 On 3 Feb 1996, David Lawson wrote: > Does anyone know where I can search for an acoustic coupler? You know; the > modem used in the movie "Wargames" that required you to physically set the > handset down on it. Please respond by E-mail. > Thanks, > KF4EBP > > > From lwbyppp@epix.net Fri Feb 09 17:00:43 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!newsfeed.direct.ca!usenet From: ccouplan@direct.ca (chris coupland) Newsgroups: rec.radio.amateur.homebrew Subject: Poor Man's Packet Date: Wed, 07 Feb 1996 03:39:57 GMT Organization: Internet Direct Lines: 10 Message-ID: <4f971p$msa@aphex.direct.ca> NNTP-Posting-Host: 204.174.248.163 X-Newsreader: Forte Free Agent 1.0.82 Looking for a project article titled "Poor Man's Packet" found in the August 1991 (pg. 8) of `73: Amateur Radio Today'. Any help in locating this would be greatly appreciated. Also looking for other info concerning one chip packet modems to use in a project. It will be used to send async serial data one way to a remote PC. Thanks. Chris. From lwbyppp@epix.net Fri Feb 09 17:00:44 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!tank.news.pipex.net!pipex!oleane!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!tuegate.tue.nl!news.IAEhv.nl!news From: ericw@iaehv.nl (Eric-Jan Wösten) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Printer generated transparency problem Date: Fri, 02 Feb 1996 10:07:55 GMT Organization: Internet Access Eindhoven, the Netherlands Lines: 23 Message-ID: <4esraa$5bk@iaehv.IAEhv.nl> References: <4ep7jg$326k@useneta1.news.prodigy.com> Reply-To: ericw@iaehv.nl NNTP-Posting-Host: pm2d10.iaehv.nl X-Newsreader: Forte Free Agent 1.0.82 JLAN98A@prodigy.com (Kenneth Burtchaell) wrote: >I am experiecing difficulty in getting a good solid blackening in the >solid trace areas of PCB layout transparencies on my Okidata OL400 >printer.It has been suggested to me that this might be a electro static >induced problem . Anybody have any good ideas? > > 73 Ken W6GHV I use a HP 4P with the original toner cartridges and HP's transparencies....only on some traces minor problems... I use to make really black with an ink-pen...really no real problem. \ Eric-Jan Wosten DDS \ Best, Holland ========================= Internet: ericw@iaehv.nl AMPRnet: pa3cev@pa3cev.ampr.org AX25:pa3cev@pi8zaa.#bra.nld.eu From lwbyppp@epix.net Fri Feb 09 17:00:45 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!gatech!newsfeed.internetmci.com!sierra.net!squaw-d118.sierra.net!user From: rst@tetrault.com (Bob T.) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: Tue, 06 Feb 1996 06:33:29 -0800 Organization: Engineered Solutions Lines: 9 Message-ID: References: <4enu4k$gom@crash.microserve.net> <4eqdr2$pjm@cc.iu.net> <823443771.29689@pinetree.microserve.com> NNTP-Posting-Host: squaw-d118.sierra.net A crystal based digital frequency source may be possible with some increase in elaboration over one or two chips, and the result could well be more stable than the PTO, however the digital noise (and phase noise) of the modification will probably (almost certainly) be a step backwards, and there may be also a new host of idiosyncratic components to characterize in ways you never thought possible. Good Luck. Bob T. From lwbyppp@epix.net Fri Feb 09 17:00:46 1996 Path: news.epix.net!news.sprintlink.net!guitar.sound.net!imci5!suck-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!edisto.awod.com!harbour.awod.com!usenet From: glittle@awod.com (Glenn E. Little) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: 4 Feb 1996 21:03:44 GMT Organization: Amateur Radio Lines: 68 Message-ID: <4f36vg$i0b@harbour.awod.com> References: <4enu4k$gom@crash.microserve.net> <4eqdr2$pjm@cc.iu.net> <823443771.29689@pinetree.microserve.com> NNTP-Posting-Host: chs0053.awod.com X-Newsreader: WinVN 0.92.6+ In article <823443771.29689@pinetree.microserve.com>, jackl@pinetree.microserv e.com (WB3U) says: > >First, I want to thank everyone for the excellent ideas and information >on this subject. > >The first two PTO's are back in the rig now and I have had a chance to >use them on the air for a few days. They seem to have settled down a >little, or at least they're not showing the same drift characteristics >as when they were on the test bench. I'm not sure why that is, because >I was testing them in the rig after each change. > >At any rate, the initial, slow warmup drift now seems to be downward >rather than upward, indicating that some additional compensation might >be needed. It's not too bad though, and I may leave it as-is. The >drift that occurs when I begin transmitting (which is aggravated when >I use my amplifier because it's next to the rig), is still in an >upward direction. > >This may be the result of a temperature gradient across the PTO >components (I think it was Cliff who mentioned that possibility). >Short of potting the PTO or installing a heater, there may not be much >I can do about this. I want to mention that the problem isn't all >that bad, and maybe I'm just being picky. I was reading an older >receiver construction article recently titled "An Engineer's Ham-Band >Receiver", which describes a very well-constructed piece of equipment. >The author's VFO was built on a custom (heavy) subassembly using a few >of the parts from a BC-221 frequency meter. When he talks about how >good the stability is, he describes it as being within 5 ppm per >degree (Centigrade, I think). Now, if my math is correct, that means >that at a PTO frequency of approximately 5 MHz, a temperature change >from 70F to 80F could cause a frequency change of as much as 150 Hz. >Actually, the PTO's I've already worked on are not be too far from that >kind of stability at this point, at least for initial drift. > >I guess what's bothering me most about this is that my old Yaesu >FT-101EE was like a rock, despite the fact it was a hybrid. After a >fifteen minute warmup, I could ragchew for hours on CW without touching >the dial once. Maybe this was just luck of the draw; some owners I've >talked to have apparently had major problems with drift in their 101's. > >Anyway, the responses to my original question are enough to keep me >busy reading, checking components and experimenting for several weeks >or even months. As a possible alternative before I start this project >in earnest, can anyone tell me whether it's feasible to consider >replacing the PTO's with 5-5.5 MHz synthesizers? I've missed most of >the QST/CQ/Ham Radio articles in the last five years so I'm not familiar >with advances regarding available components. Is it possible to build >a synthesizer for this application with 10 Hz resolution at a reasonable >cost, say with two or three chips? Or is this the type of design that >still requires a fairly complex circuit? > >Tnx & 73, >Jack WB3U Your drift now may be due to rf heating. Commercial VFOs use multiple caps in parallel in areas of RF in the VFO. This is addressed in the ARRL handbook. The theory is the RF will distrubute itself across the parallel caps and reduce the capacitance change due to heating, The heating is caused by dielectric loss and RF. Maybe you can get the thing totally settled dowm. 73 Glenn WB4UIV From lwbyppp@epix.net Fri Feb 09 17:00:47 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!lerc.nasa.gov!purdue!oitnews.harvard.edu!das-news2.harvard.edu!news4.ner.bbnplanet.net!news.ner.bbnplanet.net!usenet.continental.com!usenet From: Paul Christensen Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: 7 Feb 1996 21:58:35 GMT Organization: Continental Cablevision Lines: 8 Message-ID: <4fb7ab$53f@usenet.continental.com> References: <4enu4k$gom@crash.microserve.net> <4eqdr2$pjm@cc.iu.net> <823443771.29689@pinetree.microserve.com> NNTP-Posting-Host: 169.152.167.75 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: jackl@pinetree.microserve.com Jack: Additionally, you may want to read Wes Hayward's article in the December, 1993 issue of QST, entitled, "Measuring and Compensating Oscillator Frequency Drift." -Paul, N9AZ From lwbyppp@epix.net Fri Feb 09 17:00:48 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!agate!howland.reston.ans.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!uwm.edu!newsspool.doit.wisc.edu!news.uwsuper.edu!wpo.uwsuper.edu!pguello From: pguello@wpo.uwsuper.edu (Paul Guello) Newsgroups: rec.radio.amateur.homebrew Subject: radio direction finding Date: 6 Feb 1996 16:04:00 GMT Organization: University of Wisconsin - Superior, Wisconsin Lines: 4 Message-ID: NNTP-Posting-Host: 137.81.10.154 I'm looking for technical information about radio direction finding eauipment. Can anyone suggest where to look. I am especially interested in how automatic direction finders work. Thanks, Paul. From lwbyppp@epix.net Fri Feb 09 17:00:49 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!newsfeed.pitt.edu!bb3.andrew.cmu.edu!casaba.srv.cs.cmu.edu!fore.com!not-for-mail From: ed@fore.com (Ed Bathgate) Newsgroups: rec.radio.amateur.homebrew Subject: Repeater controller speech synth chip? Date: 9 Feb 1996 11:10:10 -0500 Organization: FORE Systems, Inc. Lines: 8 Message-ID: <4ffrl2$rvt@baleen.fore.com> NNTP-Posting-Host: baleen.fore.com X-newsreader: xrn 7.03 What chips / chipset is used in programmable speech boards on repeater controllers? I have noticed several that have quite clear synth speech and one that even goes from male to female after midnight. 73 Ed N3SDO Ed@fore.com From lwbyppp@epix.net Fri Feb 09 17:00:50 1996 Path: news.epix.net!news.sprintlink.net!news00.sunet.se!sunic!news99.sunet.se!erinews.ericsson.se!eua.ericsson.se!news.algonet.se!news.uoregon.edu!news.orst.edu!engr.orst.edu!reuter.cse.ogi.edu!qiclab.scn.rain.com!psgrain!newsfeed.internetmci.com!in2.uu.net!alterdial.uu.net!not-for-mail From: "Thomas L. Gaines, Sr." Newsgroups: rec.radio.amateur.homebrew Subject: SB-220 BAND SWITCH REPLACEMENT Date: 4 Feb 1996 12:28:47 GMT Lines: 5 Message-ID: <4f28pv$c1a@alterdial.UU.NET> NNTP-Posting-Host: 192.251.143.110 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) I am looking for a replacement switch deck(wafer) for the SB-220 amplifier. If anyone has a substitution, plase give me the source.\\ Tom Gaines/N5ISE From lwbyppp@epix.net Fri Feb 09 17:00:51 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!uwm.edu!vixen.cso.uiuc.edu!newsfeed.internetmci.com!in1.uu.net!alterdial.uu.net!not-for-mail From: "Thomas L. Gaines, Sr." Newsgroups: rec.radio.amateur.homebrew Subject: Re: SB-220 BAND SWITCH REPLACEMENT Date: 6 Feb 1996 12:50:22 GMT Lines: 4 Message-ID: <4f7iqe$4j@alterdial.UU.NET> References: <4f28pv$c1a@alterdial.UU.NET> <4f3737$hhu@cloner2.ix.netcom.com> NNTP-Posting-Host: 192.251.143.110 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 16bit) Tnx to Tom and Jim for the response. 73, Tom Gaines/N5ISE From lwbyppp@epix.net Fri Feb 09 17:00:52 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: SB-220 BAND SWITCH REPLACEMENT Date: 9 Feb 1996 11:52:53 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 18 Sender: root@newsbf02.news.aol.com Message-ID: <4ffu55$dt5@newsbf02.news.aol.com> References: <4fb65g$53f@usenet.continental.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4fb65g$53f@usenet.continental.com>, Paul Christensen writes: > >C'mon Tom...We all know that VHF parasitics are the #1 cause of band >switch failure. .. > >-Paul, N9AZ Yeah right, and photons come down from space and ruin tubes when the amp is on standby. And fuses work better than electronic overload circuits, and we can spin a bad tube in a lathe to straighten the filament or grid. And (as Garth said) monkeys fly out of your butt! ;-) Tom From lwbyppp@epix.net Fri Feb 09 17:00:53 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!ix.netcom.com!netnews From: edosan@ix.netcom.com (Edward) Newsgroups: rec.radio.amateur.homebrew Subject: SB220 HELP NEEDED Date: 6 Feb 1996 16:12:25 GMT Organization: The Electric Playhouse Lines: 11 Message-ID: <4f7ul9$bks@reader2.ix.netcom.com> NNTP-Posting-Host: whx-ca6-07.ix.netcom.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-NETCOM-Date: Tue Feb 06 8:12:25 AM PST 1996 X-Newsreader: WinVN 0.99.7 I have a Heathkit SB 220 amp that has a problem with the high voltage power supply. Every time I key down, the high voltage drops considerbly. I have heard that the HV supply leaves a lot to be desired and that the tubes in the amp are not running at their real potential. Does anyone have any info on how to improve the HV supply in this amp? I suspect that the caps may be old. Does this sound like it could be the problem? Any help would be welcomed. Thank you.......KC6HVI From lwbyppp@epix.net Fri Feb 09 17:00:54 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!news2.net99.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematics going to a web page Date: 7 Feb 1996 16:06:26 GMT Organization: Dover Research Corp. Lines: 19 Message-ID: <4faim2$7ll$1@mhafn.production.compuserve.com> Hi Kerry, there has been a lot of talk about posting schematics on the net. Some of the talk has been how (what format) some has been a lot of bandwidth of the legalities. I'm more interested in the how. In my mind a schematic should be in a machine readably format that can be "used". So not in GIF, TIFF etc type "Paint" formats. Sure you get the info from one place to anothe r but if you send me a GIF file of a really neat QRP rig that I want to build I start by reentering it from scratch. Thus I term all paint type files as Engineering Napkins. You know, like in the old days when the CAD operator was a draftsman and the engineer was not involved in that stage. A better approach is to use some electronic format that includes the parts, connections and can create a netlist. One other desired feature is ASCII format so we can send it back and forth without UUEncoding etc. My (highly Jaded) view is to use CIRCAD. It meets all of the above and the program also works with OrCAD, Tango, Protel, ACAD and other files. The demo is free so everyone can view files. The demo also lets you write (aprox 32K) files so we can all exchange small files cheaply. So, thats my 2 cents worth. Thanks for the new WEB Site! -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Fri Feb 09 17:00:55 1996 Path: news.epix.net!news.sprintlink.net!news.2sprint.net!news.iadfw.net!usenet From: kmiller@airmail.net (Kerry W. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: Schematics going to a web page Date: Wed, 07 Feb 1996 04:34:27 GMT Organization: customer of Internet America Lines: 35 Message-ID: <4f9a50$ovu@news-f.iadfw.net> NNTP-Posting-Host: dal22-30.ppp.iadfw.net X-Newsreader: Forte Free Agent 1.0.82 Hello again, guys! Well, I asked before I posted the schematic and got many good suggestions about where/how to post the schematics. Now that I've posted the first one, everyone has been very helpful except for a few flames from those who didn't appreciate me using up the bandwidth in the newsgroup. I knew it might be a hardship on some folks, that's why I asked first! Wish they'd have said something before I did it! To accomodate those who don't want them on the newsgroup, I'll be sending them to a gentleman who offered to put them on his QRP web page. When I finish cleaning up the scans, I'll send him the files and you can find them there when he has time to upload them. If there is anyone who doesn't have access to a web browser or can't get to them, let me know and I'll put the drawings into one big zip file and send them via email. The whole lot of them will be around 250Kb, so it won't be unbearable. Hope this works, I'm sending this note with Eudora and I've never tried making a mailing list before! I'll drop a note on the newsgroup for anybody who misses it. Thanks for your patience and suggestions. The web page to watch belongs to: John R. Cunliffe N2NEP cunliffe@frontiernet.net http://www.frontiernet.net/~cunliffe Keep an eye out for it, maybe the schematics will appear there in the next week or so. Make a bookmark! 73, Kerry Miller From lwbyppp@epix.net Fri Feb 09 17:00:56 1996 Path: news.epix.net!news.sprintlink.net!lori.albany.net!news.sover.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!chi-news.cic.net!cougar.olivet.edu!tiger.olivet.edu!mhaydon From: Michael Haydon Newsgroups: rec.radio.amateur.homebrew Subject: Re: Source of crystals? Date: Fri, 2 Feb 1996 22:50:20 -0600 Organization: Olivet Nazarene University Lines: 17 Message-ID: References: <4en0gj$la4@hilbert.dnai.com> NNTP-Posting-Host: tiger.olivet.edu Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <4en0gj$la4@hilbert.dnai.com> try 1-800-jan-xtal On 31 Jan 1996, Stan Jacox wrote: > I'm in the process of refurbing a Motorola Micor T83RTA mobile rig after > many years of not working on commercial gear and found that I don't have a > source for xtals. Apparently the grinders I used to use aren't in > business anymore. > Who still makes crystals for the KN1005 and KN1007 TCXOs? Looking through > QST didn't reveal a single ad, > > Stan Jacox KM6XZ > http://www.studio-maint.com/~stanj > > > From lwbyppp@epix.net Fri Feb 09 17:00:58 1996 Path: news.epix.net!uunet!in2.uu.net!gatech!news.sprintlink.net!news.icanect.net!news From: Eliot Fenton Newsgroups: rec.radio.amateur.homebrew Subject: Re: Stereo xmitter chip? Date: Thu, 01 Feb 1996 21:50:41 -0800 Organization: Internet Communications of America Lines: 14 Message-ID: <3111A631.1D1A@icanect.net> References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> NNTP-Posting-Host: ascend-100.icanect.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6b (Win16; I) Cliff: I found an article in Radio Electronics from March 1988 that details the construction of a stereo xmitter. From what I've read in the alt.pirate.radio group, Rohm makes a chip (BA1404) that does much of the same thing and is available in an FM kit (FM10 or FM25) from Ramsey. Unfortunately, most of the responses indicated that the performance was lackluster. I downloaded the specs. on the chip, and it has decent channel separation (45 dB) so I don't understand why it should perform poorly. -- Eliot Fenton ics@icanect.net From lwbyppp@epix.net Fri Feb 09 17:00:59 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!bk296 From: bk296@FreeNet.Carleton.CA (Gordon Symonds) Subject: Thordarson T92R21 Transformer Specs Message-ID: Sender: bk296@freenet5.carleton.ca (Gordon Symonds) Reply-To: bk296@FreeNet.Carleton.CA (Gordon Symonds) Organization: The National Capital FreeNet Date: Wed, 7 Feb 1996 02:04:57 GMT Lines: 16 According to Thordarson catalogue #400CX (Spring/Summer 1939), this transformer is a metal cased, general purpose power transformer: Primary VA - 150 Secondary - 800 VAC CT @ 150 ma 5 VAC @5A 6.3 VAC CT @ 5A Dimensions - 4 1/4W x 3 3/4D x 4 7/8H Weight - 9 lbs Hope this is of help. From lwbyppp@epix.net Fri Feb 09 17:01:00 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!news.u.washington.edu!uw-beaver!newsfeed.rice.edu!bcm.tmc.edu!pendragon!ames!lll-winken.llnl.gov!fnnews.fnal.gov!nntp-server.caltech.edu!tom-dunn.caltech.edu!user From: dunnt@starbase1.caltech.edu (T Dunn) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Thordarson Xfmr Specs sought Date: Mon, 05 Feb 1996 17:33:10 -0800 Organization: Caltech Lines: 23 Message-ID: References: NNTP-Posting-Host: tom-dunn.caltech.edu > I've run across two NOS Thordarson power xfmrs, but > have no data on their specs. The part number is > > T-92R21 > > If some kind soul has a post-WWII Thordarson catalog, > I'd appreciate a copy (costs supported, of course), > or at least the parameters of this particular xfmr. > > Thanks and 73 de WB6BYH > Well the catalog from my file does not show any Thordarson part # begining with a single letter "T". I also checked a Traid cross reference for Thordarson part # and no "T" either. I found a Thordarson 26R21 in thier catalog. It's a 350v CT at 225 Mils with 5v at 3 amps 6.3 at 10 amp and 6.3 at 2.7 amps. Size is 4.75H X 3.75W X 4.5" , Weight is 11.5 lb. The Thordarson catalog I have is OLD. It list thier phone number as 1200 in Mt. Carmel Illinois. That right only 4 digits. If the Xformer above is not close to the size you have give me some specks, and I'll see if I can find a match. 73 Tom dunnt@starbase1.caltech.edu From lwbyppp@epix.net Fri Feb 09 17:01:01 1996 Path: news.epix.net!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: TT 22 Valve Date: Mon, 5 Feb 1996 18:53:38 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 4 Message-ID: References: <4enu4k$gom@crash.microserve.net> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: Does anyone know of an American replacement for the TT 22 tube? It appears to be a sweep tube of some sort. A pair is used in a marine SSB radio made in Denmark. Alternately, a source for the tube in the USA would be appreciated. Cliff Buttschardt W6HDO From lwbyppp@epix.net Fri Feb 09 17:01:02 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: pierre@fildir.unimi.IT (Pierpaolo Sardelli) Newsgroups: rec.radio.amateur.homebrew Subject: vfo.zip file attachment corrupted Date: 7 Feb 96 22:59:23 GMT Organization: ucsd usenet gateway Lines: 17 Message-ID: NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Hi all ! I received from the Mailing List a corrupted file... i tried to fetch it twice from my server, but having always the same modem. Can anyone of you send it again to me, please ? Thanks a lot ! - Pierpaolo - e-mail pierre@fildir.unimi.it _____________________________ Pierpaolo Sardelli E-mail: pierre@fildir.unimi.it From lwbyppp@epix.net Fri Feb 09 17:01:03 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.uoregon.edu!marlin.ucsf.edu!overload.lbl.gov!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!csnews!coopnews.coop.net!news.den.mmc.com!usenet From: "joseph c. hawkins" Newsgroups: rec.radio.amateur.homebrew Subject: VOX Circuit? Date: 5 Feb 1996 22:45:06 GMT Organization: Lockheed Martin -- Denver InterNetNews site Lines: 6 Message-ID: <4f619i$li6@tel.den.mmc.com> NNTP-Posting-Host: mac-athena.den.mmc.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Macintosh; I; 68K) X-URL: news:rec.radio.amateur.homebrew Any sample VOX circuits or info of where to get info would be greatly appreciated. Thanks From lwbyppp@epix.net Fri Feb 09 17:01:03 1996 Path: news.epix.net!news.sprintlink.net!hookup!gatech!newsfeed.internetmci.com!news1.isp.net!news.isp.net!not-for-mail From: "Michael M. Butler" Newsgroups: rec.radio.amateur.homebrew Subject: Want dual jack assembly for spkr-mic Date: Mon, 05 Feb 1996 14:35:29 -0800 Lines: 6 Message-ID: <4f60ql$7jd@isp.net> NNTP-Posting-Host: sc152.isp.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit NNTP-NEWS-ADMIN: newsadmin@isp.net X-Mailer: Mozilla 2.0b6a (Win16; I) I've got a couple of aftermarket MFJ-285 speaker-mics that have a 2-conductor mini plug and a *3*-conductor micro plug. I'm looking for a source for the compatible dual jack assembly. Anyone know of a source? Thanks... Michael M. Butler buck@satyr.sylvan.com From lwbyppp@epix.net Fri Feb 09 17:01:04 1996 Path: news.epix.net!news.sprintlink.net!news1.channel1.com!wizard.pn.com!dns.crocker.com!calweb!usenet From: billj@calweb.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Wanted: 10 Ghz Door Opener Sources Date: 5 Feb 1996 16:57:38 GMT Organization: CalWeb Internet Services, Inc. Lines: 18 Message-ID: <4f5cu2$6as@news.calweb.com> References: <311171D7.515D@skypoint.com> <4f05ba$ev8@news.calweb.com> <311535E6.1E43@skypoint.com> NNTP-Posting-Host: sac1-27.calweb.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) To: ngjere@skypoint.com Neil Gjere wrote: >billj@calweb.com wrote: >> >> Neil Gjere wrote: >> >I'm looking for a source of the 10 Ghz Gunns used in Door Openers. >BTW, any sources for those units mentioned in your previous post??? > >Neil, N0PFZ Well Neil I have a few extras and I think there are a hundred or so in town at a dealer in scrap. Also I think there are some in a scrap metel yard but they have been out in the rain. These units are not the SOLFAN type and use a PILL type diode. How many do you want? The price would vary depending on who supplies them. I paid $1.00 each from the metal dealer (before the rain came). Bill K7NOM From lwbyppp@epix.net Fri Feb 09 17:01:05 1996 Path: news.epix.net!uunet!in2.uu.net!skypoint.com!usenet From: Neil Gjere Newsgroups: rec.radio.amateur.homebrew Subject: Wanted: 10 Ghz Door Opener Sources Date: Thu, 01 Feb 1996 20:07:20 -0600 Organization: GjereRig Inc. Lines: 10 Message-ID: <311171D7.515D@skypoint.com> NNTP-Posting-Host: dial104.skypoint.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (Win95; I) I'm looking for a source of the 10 Ghz Gunns used in Door Openers. I'm specifically looking for Solfans or Other cavities that include a Varactor as well as the Gunn diode in the housing. I have several cavities that have just the Gunns in them, and would like to experiment with other designs. 73s, Neil N0PFZ From lwbyppp@epix.net Fri Feb 09 17:01:06 1996 Path: news.epix.net!uunet!in1.uu.net!brighton.openmarket.com!decwrl!pagesat.net!calweb!calweb!usenet From: billj@calweb.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Wanted: 10 Ghz Door Opener Sources Date: 3 Feb 1996 17:17:30 GMT Organization: CalWeb Internet Services, Inc. Lines: 17 Message-ID: <4f05ba$ev8@news.calweb.com> References: <311171D7.515D@skypoint.com> NNTP-Posting-Host: sac1-9.calweb.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) Neil Gjere wrote: >I'm looking for a source of the 10 Ghz Gunns used in Door Openers. >I'm specifically looking for Solfans or Other cavities that include a >Varactor as well as the Gunn diode in the housing. > >I have several cavities that have just the Gunns in them, and would like >to experiment with other designs. > >73s, > >Neil N0PFZ I also have GUNN units that have a detector diode. I have found that I could bias the diode and use it as a Varactor and get some usable FM deviation. I havent seen any alarm units or door openers that have the Varactor. Bill K7NOM From lwbyppp@epix.net Fri Feb 09 17:01:07 1996 Path: news.epix.net!news.sprintlink.net!hideout.emanon.net!alpha.sky.net!winternet.com!guitar.sound.net!imci5!imci4!newsfeed.internetmci.com!vixen.cso.uiuc.edu!qualcomm.com!kbanke-mac.qualcomm.com!user From: kbanke@qualcomm.com (Kerry Banke) Newsgroups: rec.radio.amateur.homebrew Subject: Wanted: info on ASI Satellite Controlled Clock Date: 5 Feb 1996 14:59:58 GMT Organization: Qualcomm Lines: 7 Message-ID: NNTP-Posting-Host: kbanke-mac.qualcomm.com At a flea market I picked up a Satellite Controlled Clock model1026B made by Arbiter Sysytems Inc. I'm looking for any general info on this unit as I'd like to fire it up if practical. The front end appears to be tuned for the 470 MHz range so I'm wondering if it really uses a satellite in this range or if it uses a down converter at the antennna. Any info would be greatly appreciated. - Kerry N6IZW - From lwbyppp@epix.net Fri Feb 09 17:01:08 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!news.kei.com!newsfeed.internetmci.com!edisto.awod.com!harbour.awod.com!usenet From: glittle@awod.com (Glenn E. Little) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Wanted: info on ASI Satellite Controlled Clock Date: 8 Feb 1996 21:02:14 GMT Organization: Amateur Radio Lines: 29 Message-ID: <4fdocm$2p8@harbour.awod.com> References: NNTP-Posting-Host: chs0105.awod.com X-Newsreader: WinVN 0.92.6+ In article , kbanke@qualcomm. com (Kerry Banke) says: > >At a flea market I picked up a Satellite Controlled Clock model1026B made >by Arbiter Sysytems Inc. I'm looking for any general info on this unit as >I'd like to fire it up if practical. The front end appears to be tuned >for the 470 MHz range so I'm wondering if it really uses a satellite in >this range or if it uses a down converter at the antennna. Any info would >be greatly appreciated. > - Kerry N6IZW - The Military used a sat. system called "TRANSIT" to provide positional data to ships at sea. This system used frequencies of 149.9995 and 399.9995 MHz (I believe these are correct). The computer would determine the position of the platform it was located on by recording the doppler shift of the signal transmitted from the bird. It would compare this to an internally generated doppler curve based on assummed position and sat. orbital parameters. The sat would xmit data every even two min. This was known as a Barker word. This data contained very accurate time. Possibly this is the functiion of your unit. Transit I belive is no longer operational. When operational it could be heard on a scanner. 73 Glenn WB4UIV From lwbyppp@epix.net Fri Feb 09 17:01:09 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!uunet!in2.uu.net!news.spss.com!uchinews!news.luc.edu!newsfeed.acns.nwu.edu!math.ohio-state.edu!usc!howland.reston.ans.net!swrinde!newsfeed.internetmci.com!vixen.cso.uiuc.edu!sdd.hp.com!apollo.hp.com!hpwin055.uksr!hpqmoea!dstock From: dstock@hpqmdla.sqf.hp.com (David Stockton) Subject: Re: WD-40 vice Contact/Tuner Spray!! Sender: news@hpqmoea.sqf.hp.com (SQF News Admin) Message-ID: Date: Thu, 1 Feb 1996 16:16:40 GMT References: <4ee9o0$p4m@maureen.teleport.com> Nntp-Posting-Host: hpqmocc.sqf.hp.com Organization: Hewlett-Packard LTD, South Queensferry, Scotland Lines: 18 Roy Lewallen (w7el@teleport.com) wrote: : It's one of the Great Inventions of : the 20th Century (along with latex paint and plastic drinking : straws. .) WD40, latex paint, and plastic drinking straws ? Roy, *WHAT* were you making? Cheers, David GM4ZNX G3RJV tells me you're intending making a foray to this side of the ocean..... From lwbyppp@epix.net Fri Feb 09 17:01:10 1996 Path: news.epix.net!uunet!in2.uu.net!newsxfer2.itd.umich.edu!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WD-40 vice Contact/Tuner Spray!! Date: 3 Feb 1996 12:53:07 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 10 Sender: root@newsbf02.news.aol.com Message-ID: <4f07e3$me5@newsbf02.news.aol.com> References: <4eu5rk$ouh@jusdnews.fir.fbc.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article , mai@iquest.net (Patrick Croft) writes: >ing in an oven at 135 degrees for >about 30-60 min. after the bath. The cleanser used was called 'Swipe", >and the currently marketed 'SimpleGreen' appears to be same stuff. Be careful. My mother in law rubbed Simple Green on her car and it took the paint off!!!!!!!!!!!!!!!! 73 Tom From lwbyppp@epix.net Fri Feb 09 17:01:11 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!nctuccca.edu.tw!news.cc.nctu.edu.tw!news.csie.nctu.edu.tw!usenet From: fredkuo.bbs@csie.nctu.edu.tw Newsgroups: rec.radio.amateur.homebrew Subject: Where can I find GPS protocol format? Date: Wed, 07 Feb 1996 12:27:01 GMT Organization: Dept. Comp. Sci. & Info. Eng., Chiao-Tung Univ., Taiwan Lines: 10 Message-ID: <4fa5qa$39n@news.csie.nctu.edu.tw> NNTP-Posting-Host: @a237172.nctu.edu.tw X-Newsreader: Forte Free Agent 1.0.82 I want to DIY a GPS receiver. I am familiar with spred-spectrum systems, but no idea about the protocol of GPS signals. Is there any ftp site that I can get a detail information about the signal format? Or, is there any tecnical book has the detail description of GPS signal? Thanks in advance! fred kuo BV3DH, fredkuo@eve0.mxic.com.tw From lwbyppp@epix.net Fri Feb 09 17:01:12 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.ghgcorp.com!usenet From: "Ros St. John" Newsgroups: rec.radio.amateur.homebrew Subject: WTB: TOWER/ANTENNAE Date: Tue, 06 Feb 1996 22:38:08 -0800 Organization: GHG Corporation Lines: 20 Message-ID: <311848D0.5624@ghgcorp.com> NNTP-Posting-Host: dialupline73.ghgcorp.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win16; I) Hi. Due to a tornado, my tower and antennae are now junk. STATE FARM INSURANCE REFUSES TO PAY CLAIM!!!!! BEWARE!!!! I am looking for a used TRI-EX/HYGAIN LM-354 tower or at the very least, the center section thereof. Want used HYGAIN TH-7DXS OR TH-11. Want used CUSCHCRAFT 2 METER BOOMER. Want M2 1.2 gig atv antenna. Want AEA OR M2 434 mhz. atv antenna. Thank you. W5BRY, Ros. my email is rstjohn@ghgcorp.com From lwbyppp@epix.net Tue Feb 13 21:00:30 1996 Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!nntp.inc.net!imci3!imci4!newsfeed.internetmci.com!news.bctel.net!news.island.net!news.qb.island.net!K From: kmadsen@mail.qb.island.net (ken madsen) Newsgroups: rec.radio.amateur.homebrew Subject: 2020 Mods Radio Shack WANTED Date: 9 Feb 1996 03:09:37 GMT Organization: Island Internet Customer Lines: 6 Message-ID: <4fedth$15g@nash.qb.island.net> NNTP-Posting-Host: slip22.qb.island.net To: ALL X-Newsreader: News Xpress Version 1.0 Beta #3 Does any body have good frequence mod for a Radio Shack 2020 base mobile scanner... EMAIL ME ... kmadsen@qb.island.net From lwbyppp@epix.net Tue Feb 13 21:00:31 1996 Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc Path: news.epix.net!news.sprintlink.net!news.voicenet.com!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!newshost.vu.nl!cs.vu.nl!sun4nl!rnzll3!sys3.pe1chl!rob From: rob@pe1chl.ampr.org (Rob Janssen) Subject: Re: 82 Repeater in Kansas City Reply-To: pe1chl@wab-tis.rabobank.nl Organization: PE1CHL Message-ID: References: <4efpb3$pt2@alpha.sky.net> <310B8C36.5D9@magnum.wpe.com> <4ete1q$b0o@bcarh8ab.bnr.ca> Date: Tue, 6 Feb 1996 22:41:41 GMT Lines: 17 Xref: news.epix.net rec.radio.amateur.policy:33052 rec.radio.amateur.antenna:18989 rec.radio.amateur.equipment:24803 rec.radio.amateur.homebrew:13253 rec.radio.amateur.digital.misc:14059 In <4ete1q$b0o@bcarh8ab.bnr.ca> ddenter@bnr.ca (Dean Denter) writes: >Every radio has a "unique" pattern when you key it (due to differences >in the components etc), this pattern can be used to identify a radio. >There is no encrypted signal or anything that fancy. I have my doubts about the uniqueness of the pattern generated by same-type transmitters... and the stability of the pattern as a function of temperature, time etc. But it seems another sub-thread starts to discuss this. Rob -- +------------------------------------+--------------------------------------+ | Rob Janssen rob@knoware.nl | BBS: +31-302870036 (2300-0730 local) | | AMPRnet: rob@pe1chl.ampr.org | AX.25 BBS: PE1CHL@PI8WNO.#UTR.NLD.EU | +------------------------------------+--------------------------------------+ From lwbyppp@epix.net Tue Feb 13 21:00:33 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!gatech!newsfeed.internetmci.com!in2.uu.net!news-m01.ny.us.ibm.net!ausnews.austin.ibm.com!geraldo.cc.utexas.edu!usenet From: Bruce Bostwick Newsgroups: rec.radio.amateur.homebrew Subject: 913 or 2AP1 CRT? Date: 6 Feb 1996 22:05:51 GMT Organization: tangled hierarchy, man.. Lines: 11 Message-ID: <4f8jbv$imm@geraldo.cc.utexas.edu> NNTP-Posting-Host: pcl-a75.lib.utexas.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; PPC) X-URL: news:rec.radio.amateur.homebrew Willing to either buy one, or barter whatever you find listed in http://ccwf.cc.utexas.edu/~lihan/tube_catalog.html is worth one, for a project I'm planning. I've already (maybe) located a 2AP1 and a 2BP1, but got pointed here from news:sci.electronics.misc by someone that said I might have more luck here. Email link available on my home page. Thanks! ;-) http://ccwf.cc.utexas.edu/~lihan/ From lwbyppp@epix.net Tue Feb 13 21:00:35 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!swrinde!howland.reston.ans.net!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news From: tayloe_d@sat.mot.com (Dan Tayloe ) Subject: Any Interest in Some Filters? Reply-To: tayloe_d@sat.mot.com Organization: MOTOROLA Date: Tue, 13 Feb 1996 15:03:43 GMT Message-ID: <1996Feb13.150343.29908@schbbs.mot.com> Sender: news@schbbs.mot.com (SCHBBS News Account) Nntp-Posting-Host: 170.1.5.166 Lines: 31 I have a number of crystal filters laying around that might be of interest to the experimenter community here. These are 11.4 MHz available in both USB and LSB. The passband is about 300 to 2900 Hz, with 5 db of insertion loss, and 21 to 29 db of carrier supression. These values represent typical numbers I have seen on several samples that apparently have been measured at one time or another. These filters are composed of a set of three individual filters that are cascaded. More could be cascaded together for steeper skirt response. It may be possible to narrow the response (as is done in normal ladder filters) by using larger termination load capacitance. I myself have not used these, so I don't know the terminating resistance or the load capacitance to get the desired filter shaping. If you are interested, I am asking $5.00 per set and I will pay for shipping. Please indicate if you want Upper Sideband or Lower Sideband or if you really don't care. Thanks! - Dan Tayloe, WB0NVB, Phoenix, AZ From lwbyppp@epix.net Tue Feb 13 21:00:37 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!zippy.intcom.net!imci3!imci5!imci4!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Chris Bowick, WD4C <73617.3301@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew Subject: Re: Anyone else read Bowick's RF circuit Design? Date: 11 Feb 1996 05:58:55 GMT Organization: RF Circuit Design Lines: 25 Message-ID: <4fk0iv$cpl$1@mhade.production.compuserve.com> References: <311B7F1A@avint4.avionics.itt.com> Thank you all for your very nice comments about my book RF Circuit Design. I'm glad that you have found it useful. I originally wrote the book because I was unable to find a text on the topic that could adequately explain the in-depth RF theory the way I felt it needed to be explained---with detailed example problems and step-by-step solutions. The book was originally published by Howard W. Sams, which was later bought out by Macmillan, and is still going strong. Kish, Curtis, and Coffman et.al. did a great job of providing further explanation of Xp as it relates to Q of resonant circuits. I am considering an update to the book (2nd Edition) and would be interested in any input, suggestions, corrections, etc. that any of you might have. Perhaps we can make it an even better reference book in the future! Thanks again! Enjoy! Chris Bowick, WD4C -- Chris Bowick, WD4C, Author, RF Circuit Design From lwbyppp@epix.net Tue Feb 13 21:00:38 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!news.kreonet.re.kr!overload.lbl.gov!agate!howland.reston.ans.net!newsfeed.internetmci.com!castle.nando.net!news From: steve harris Newsgroups: rec.radio.amateur.homebrew Subject: Re: Anyone else read Bowick's RF circuit Design? Date: Mon, 12 Feb 1996 05:04:19 -0500 Organization: News & Observer Public Access Lines: 74 Message-ID: <311F10A3.5B50@po.cwru.edu> References: <4fg0ob$j9d@cloner3.netcom.com> NNTP-Posting-Host: grail1303.nando.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0GoldB1 (WinNT; I) michael silva wrote: good book. Try KBR (krauss, Bastion, Raab) for more rigor. One explanation for your confusion is as follows: f0 = K * (LC)^0.5, K is constant (1/2pi) given f0, raising C will "lower" L, this I think you know. Now remember that an inductor is manufactured from some REAL world material (usually metal), eg wire. Same for the cap. Turns out that the losses in the cap's dielectric (and any other effects) are much lower than the losses in an inductor of comparable impedence. The inductor's losses are almost all due to the resistence. Hope this helps. steve > > In Ference Kish > writes: > > > On pages 34 and 35 the book discusses the loaded Q of a resonant > > circuit; explains the effect of the source and load resistance on > > the Q of the tuned circuit. > > > > Where I got a bit confused is Eq 2-6 onward. Bowick says that the > > Q of the circuit is > > > > Q = Rp /Xp > <...> > > No comes the tricky bit: He than concludes ( if I've read it > correctly ) > > that the best way of doing this is by INCREASING the capacitance... > <...> > > I thought the more inductance we have the better the Q of the tuned > circuit > > will be. > > This is often confusing (to me as well), because whether you use R/X or > X/R depends on whether you're talking about a parallel or series > circuit. These definitions of 'Q' are just derived from the more > fundamental meaning (ratio of 'lossless' power to power dissipated), so > it helps to go back to the fundamental meaning when thinking of X's and > R's. In a parallel tuned circuit, such as the one in your example, the > voltage across the circuit is the independant variable (kind of...), so > to increase the ratio of lossless power to dissipated power you need to > increase the ratio of current thru the X's to current thru the R. You > do this by decreasing the X's (higher C, lower L). Another way to look > at this is that lower X's in a parallel circuit will shunt the voltage > across the circuit faster as you move away from resonance, thus giving > the sharper peak of a higher-Q circuit. > > For series circuits the situation is reversed, with current being the > independant variable (again, kind of...). Here the way to increase the > ratio of lossless power to dissipated power is to increase the voltages > across the X's by making them larger (lower C, higher L). Then as you > move away from resonance the dominant X (the one that's rising) will > reduce the current faster, resulting in a sharper peak once more. > > I know I've done a lot of hand-waving here, but I've tried to explain > it in an intuitive way. Hope it was helpful. > > BTW, I think Bowick's book is great. > > 73, > Mike, KK6GM From lwbyppp@epix.net Tue Feb 13 21:00:39 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!khis_news.khis.kodak.com!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Anyone else read Bowick's RF circuit Design? Message-ID: <1996Feb9.091402.10841@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: Date: Fri, 9 Feb 1996 09:14:02 GMT Lines: 60 In article Ference Kish writes: > I've just started reading Chris Bowick's RF Circuit Design. > > I quite like it and recommend it to others, however, there is something tha t > is puzzling me. > > On pages 34 and 35 the book discusses the loaded Q of a resonant > circuit; explains the effect of the source and load resistance on > the Q of the tuned circuit. > > Where I got a bit confused is Eq 2-6 onward. Bowick says that the > Q of the circuit is > > Q = Rp /Xp > > where Rp is (Rs * Rl) / (Rs + Rl) and Xp is the inductive/capacitive > reactance, Rs and Rl are source and load resistance respectively. > > No worries so far. > > Then he goes on saying that if we want to optimize the Q of the tank > circuit with source/load resistance fixed we need to change Xp thru' > the L or C of the circuit. Fair enough. > > No comes the tricky bit: He than concludes ( if I've read it correctly ) > that the best way of doing this is by INCREASING the capacitance... > > I'm not an expert, I'm just starting of, however, from what I heard and > tried before, it seemed to me that increasing the L is the better way. > > I thought the more inductance we have the better the Q of the tuned circuit > will be. > > > Mathematically he seems correct if one looks at his example: > > changing from L=50nH, C=25pF to L=2.5nH and C=500pF @142.35Mhz the Q > > of the second combination seems higher ( load resistance of 50R). > > > Could someone enlighten me, have I misread anything? Two things are at work here. First, when the value of C is increased, the value of Xc *decreases*, but when the value of L is increased, XL *increases*. Now since Q is Rp/Xp, the *smaller* we can make Xp, the higher the resulting Q. The second thing at work, and not shown in this example, is that most of the circuit intrinsic R is in the inductor. All other things equal, reducing L also reduces intrinsic R. Now that's usually only significant for lightly loaded circuits, but it is another factor favoring high C low L circuits. As Q increases, so do circulating currents, and the intrinsic R of the circuit begins to play a larger role in ultimate Q. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Tue Feb 13 21:00:40 1996 Path: news.epix.net!uunet!in1.uu.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet From: Philip Manning Newsgroups: rec.radio.amateur.homebrew Subject: Apologises for multiple mailings. Date: 13 Feb 1996 12:58:34 GMT Organization: University of Surrey, Guildford, England Lines: 4 Message-ID: <4fq1tq$ef7@info-server.surrey.ac.uk> NNTP-Posting-Host: olympus.ee.surrey.ac.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.3 sun4m) X-URL: news:rec.radio.amateur.homebrew Sorry folks, murphy's law occurred, re my mailing on Icom IC-2SAT article. Phil Manning G1LKJ From lwbyppp@epix.net Tue Feb 13 21:00:41 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!univ-lyon1.fr!in2p3.fr!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!howland.reston.ans.net!ix.netcom.com!netcom.com!mzenier From: mzenier@netcom.com (Mark Zenier) Subject: Re: Arizona Microschip Message-ID: Organization: NETCOM On-line Communication Services (408 261-4700 guest) References: <4eu5rk$ouh@jusdnews.fir.fbc.com> <4f07e3$me5@newsbf02. <4f3uu1$dr3@news.asu.edu> <4f6b9o$qba@stealth.mindspring.com> Date: Thu, 8 Feb 1996 20:16:46 GMT Lines: 17 Sender: mzenier@netcom18.netcom.com in <4f6b9o$qba@stealth.mindspring.com>, Jeff Otterson wrote: : ballnt@aztec.asu.edu (John Ballentine) wrote: : >In a previous article, cbuttsch@biggulp.callamer.com (Clifford Buttschardt) says: : >>Recently, I ran across a reference to Arizona Microchip devices which was : >>interesting. Does anyone have an address or a clue as what they : >>manufacture? I suspect it might be a "STAMP" product but I am not : >>Cliff Buttschardt W6HDO Morro Bay, Calif : Check out http://www.ultranet.com/biz/mchip for all your microchip : questions. All the data sheets, development tools and manuals are : there, and the price is right! Also www.parallaxinc.com for the web page for the makers of the Basic Stamp. Mark Zenier mzenier@eskimo.com mzenier@netcom.com From lwbyppp@epix.net Tue Feb 13 21:00:42 1996 Path: news.epix.net!uunet!in2.uu.net!gatech!newsfeed.internetmci.com!news.sprintlink.net!twizzler.callamer.com!biggulp.callamer.com!cbuttsch From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: Arizona Microschip Date: Tue, 13 Feb 1996 09:41:01 -0800 Organization: Call America Internet Services +1 (805) 541 6316 Lines: 31 Message-ID: References: <960209064211_74003.470_BHR29-3@CompuServe.COM> NNTP-Posting-Host: biggulp.callamer.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII In-Reply-To: <960209064211_74003.470_BHR29-3@CompuServe.COM> Thanks Paul for the reply. Appreciate your help. Cliff Buttschardt W6HDO On 9 Feb 1996, Paul Ostby wrote: > > > Recently, I ran across a reference to Arizona Microchip devices which was > > interesting. Does anyone have an address or a clue as what they > > manufacture? I suspect it might be a "STAMP" product but I am not > > sure. They have a development kit available too. > > Cliff Buttschardt W6HDO Morro Bay, Calif > > Microchip Technology Inc. manufactures some nifty CMOS microcontrollers. I' ve > used them for several years now. They are hard to beat for high speed, low > power, and low cost. The address from their most recent databook is: > Microchip Technology Inc. > 2355 West Chandler Blvd. > Chandler, AZ 85224-6199 > Tel: 602.786.7200 > Fax: 602.899.9210 > > Microchip also manufactures various EPROMs, EEPROMs, an LCD controller, and some > other miscellaneous chips. You can download datasheets from their web site at: > http://www.ultranet.com/microchip > > The BASIC Stamp is manufactured by Parallax, Inc. The Stamp uses a Microchi p > controller for the CPU, but Parallax adds an EEPROM and a BASIC interpreter. > > Paul Ostby, KC7CKU > > > From lwbyppp@epix.net Tue Feb 13 21:00:43 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!cornellcs!newsstand.cit.cornell.edu!news.tc.cornell.edu!news.cac.psu.edu!news.math.psu.edu!chi-news.cic.net!newsfeed.internetmci.com!in2.uu.net!news.ner.bbnplanet.net!usenet.continental.com!usenet From: Paul Christensen Newsgroups: rec.radio.amateur.homebrew Subject: Re: Be a Radio Disk Jockey! Date: 12 Feb 1996 14:10:37 GMT Organization: Continental Cablevision Lines: 13 Message-ID: <4fnhot$p5c@usenet.continental.com> References: <4f68c2$p1r@newsbf02.news.aol.com> <4ff351$mhg@maureen.teleport.com> NNTP-Posting-Host: 169.152.167.73 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: w7el@teleport.com >> The money is good, the hours are flexible. . . >>. . . > >Wow! Sounds like two things have changed a whole lot since my radio days. > >Roy Lewallen, W7EL Since these two things haven't changed in twenty years, I left the dead broadcasting industry last year. It's a loser unless you're 100% into sales. -Paul, N9AZ From lwbyppp@epix.net Tue Feb 13 21:00:44 1996 Path: news.epix.net!news.sprintlink.net!news.magicnet.net!news.supernet.net!news.cais.net!zippy.cais.net!news From: Jim Sutton/AC4CZ Newsgroups: rec.radio.amateur.homebrew Subject: Computer Control of FT-1000 Date: 7 Feb 1996 03:38:43 GMT Organization: Capital Area Internet Service info@cais.com 703-448-4470 Lines: 7 Message-ID: <4f96s3$dm5@zippy.cais.net> NNTP-Posting-Host: ppp20.erols.com X-Newsreader: SPRY News 3.03 (SPRY, Inc.) Would appreciate any information on computer control of FT-1000 and also FT-736R. Many thanks, 73/Jim/AC4CZ jim@erols.com From lwbyppp@epix.net Tue Feb 13 21:00:45 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dummy Load Date: 9 Feb 1996 20:37:10 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 14 Sender: root@newsbf02.news.aol.com Message-ID: <4fgss6$ouk@newsbf02.news.aol.com> References: <4fg515$5ou@crash.microserve.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4fg515$5ou@crash.microserve.net>, jackl@pinetree.microserve.com (WB3U) writes: >Now, who can find the error in this sentence: "I are a nit-picker." > >:) > >73, >Jack WB3U The error is you left the J off. The correct phrase is "JI are a nit-picker" not "I are a nit picker". 73 Tom W8JI From lwbyppp@epix.net Tue Feb 13 21:00:46 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!swidir.switch.ch!in2p3.fr!usenet From: Jean Marie Bussat Newsgroups: rec.radio.amateur.homebrew Subject: Function and pinout for some RF IC Date: 13 Feb 1996 14:07:10 GMT Organization: Centre de Calcul In2p3 Lines: 26 Message-ID: <4fq5ue$6ql@ccpnws.in2p3.fr> NNTP-Posting-Host: lapphp.in2p3.fr Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; HP-UX A.09.04 9000/897) X-URL: news:rec.radio.amateur.homebrew Hello, Does anybody have (or may tell me where I can find) the pinout and the function of the following IC's. CX 7925 (nothing from Sony's Web site) TC 5081 (nothing from Thoshiba) TC 5082 TA 7310 HD 1055 (nothing from Hitachi) There are in the PLL section of a RANGER RCI2950 tranceiver and I want to understand how does it work. I've made some deductions but I don't think they're all right. Thanks for any kind of help. Jean-Marie +---------------------------------------------------------------+ | Jean-Marie Bussat - Laboratoire d'Annecy-le-vieux de Physique | | des Particules - BP 110 - 74941 ANNECY-LE-VIEUX - FRANCE | | Email: bussat@lapp.in2p3.fr | | Tel: (33) 50 09 17 47 Fax: (33) 50 09 89 13 | +---------------------------------------------------------------+ From lwbyppp@epix.net Tue Feb 13 21:00:47 1996 Path: news.epix.net!news.sprintlink.net!news.accessone.com!news From: vbook@vbook.com (Ed Mitchell) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew,rec.radio.amateur.space,rec.radio.amateur.antenna,,rec.radio.amateur.equipment,rec.radio.amateur.policy,rec.radio.scanner,rec.radio.shortwave Subject: Ham Radio Online goes Interactive! Check us out! Date: 12 Feb 1996 16:20:22 GMT Organization: Virtual Publishing Co. Lines: 44 Message-ID: <4fnpc6$38f@news.accessone.com> NNTP-Posting-Host: vbook.accessone.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 Xref: news.epix.net rec.radio.amateur.misc:98010 rec.radio.amateur.digital.misc:14099 rec.radio.amateur.homebrew:13295 rec.radio.amateur.space:6310 rec.radio.amateur.antenna:19025 rec.radio.amateur.equipment:24869 rec.radio.amateur.policy:33073 rec.radio.scanner:45431 rec.radio.shortwave:70000 INTRODUCING HAM RADIO ONLINE INTERACTIVE! Now you can post free classified ads, DX openings, VHF band openings and much more. And with over 10,000 readers stopping by last month, your thoughts will actually get read at this ham radio web site! We are not just pointers to cyberspace - we've got actual content - feature articles, newsletters, product reviews, real-time propagation conditions and more. The February 1996 edition of Ham Radio Online International Magazine is available at http://www.accessone.com/~vbook/hronline.htm Some of the NEW February stories include a review of SkyTel's "2-way paging" s ystem, radio surveillance frequencies, and the effects of two-way radio operation in blasting zones. Ham Radio Online has been selected as a featured web site by America Online and a Top 100 web site for the month of January by Planet Earth, Inc. New articles are available now and we add articles throughout the month. Ham Radio Online has up-to-date news about Amateur Radio from around the world , feature stories, real-time propagation and auroral condition reports, real-tim e earthquake and severe weather conditions for emergency communications planning , online humor section and the Ham Radio Online Library with fully indexed (find any section with just a mouse click) Part 97 rules and regulations. Plus we cover broadcasting, shortwave, scanning generally anything having to do with radio telecommunications. And we plan to offer some totally cool new services during the coming months. As always its free and free of ads. Thanks to you, we had over 10,000 readers stop by during January! Please enjoy! 73, Ed Mitchell KF7VY vbook@vbook.com http://www.accessone.com/~vbook/hronline.htm ------------------------ personal email to vbook@vbook.com Visit Ham Radio Online, it's free, at http://www.accessone.com/~vbook/hronline .htm From lwbyppp@epix.net Tue Feb 13 21:00:48 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!intac!uunet!in1.uu.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: Tom.Turnbull@durham.ac.UK (Tom Turnbull) Newsgroups: rec.radio.amateur.homebrew Subject: Help Date: 8 Feb 96 17:23:45 GMT Organization: ucsd usenet gateway Lines: 3 Message-ID: NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu HELP From lwbyppp@epix.net Tue Feb 13 21:00:49 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!aimnet.com!news.exodus.net!uunet!in1.uu.net!news.iii.net!news From: "Thomas C. J. Sefranek" Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design Subject: Re: Help design coil for coupling 2 amplifiers Date: 11 Feb 1996 12:01:09 GMT Organization: SRC Lines: 11 Message-ID: <4fklqo$k1c@news.iii.net> References: <4fkhdu$4e9@aldebaran.sct.fr> NNTP-Posting-Host: wa1rhp.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: opworld@worldnet.fr Xref: news.epix.net rec.radio.amateur.homebrew:13272 sci.electronics.design:2705 If you were lucky, and the phase difference is not too bad between amplifiers, a simple 1/4 wave line from/to each amplifier of 75 ohm coax will function as splitter and combiners. 50 -> 1/4 wave 75 ohm coax -> 102.5 Ohms Use a tee to join both and you're backto about 50 ohms! Enjoy! Tom From lwbyppp@epix.net Tue Feb 13 21:00:50 1996 Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design Path: news.epix.net!news.sprintlink.net!mhv.net!news.westnet.com!imci4!imci5!pull-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Help design coil for coupling 2 amplifiers Message-ID: <1996Feb12.003037.24437@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4fkhdu$4e9@aldebaran.sct.fr> Date: Mon, 12 Feb 1996 00:30:37 GMT Lines: 33 Xref: news.epix.net rec.radio.amateur.homebrew:13305 sci.electronics.design:2775 In article <4fkhdu$4e9@aldebaran.sct.fr> opworld@worldnet.fr writes: >I would like to add the power of two identical amplifiers in 80-120MHz >range with 300W each. > >I don't know how. > >I believe that you have to apply signal to each amplifier (invert one >signal like LF amplifier ?) adapting impedance (50 ohms -> 50 + 50 >ohms). For output add power with impedance matching. What you need is called a Wilkinson power splitter/combiner. This will divide the drive power equally between the amplifiers, and combine their output powers. Phase is maintained identical through both paths, except for the differences in phase internal to the two amplifiers. That can be compensated by using an adjustable phase shifting network at the input of one of the amplifiers, IE a line stretcher or the like, and adjusting to null reject power. You may also need to be able to control the gain of one of the amplifiers so that you can exactly match amplitude response too, again adjusting to null reject power. Wilkinson networks are easy to build for a specific frequency. In your range they would just be lengths of coax and a reject load resistor. To cover the entire 80-120 MHz spread without retuning would be more difficult. See any RF handbook for details of building Wilkinson splitters and combiners. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Tue Feb 13 21:00:51 1996 Path: news.epix.net!news.sprintlink.net!news.clark.net!rahul.net!a2i!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!newsfeed.internetmci.com!chi-news.cic.net!news.compuserve.com!news.production.compuserve.com!news From: NAME: <100623.303@CompuServe.COM> Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur Subject: ICOM IC-2SAT HELP!? Date: 12 Feb 1996 02:16:28 GMT Organization: ORG: Lines: 18 Message-ID: <4fm7ts$no7$1@mhade.production.compuserve.com> Xref: news.epix.net rec.radio.amateur.equipment:24867 rec.radio.amateur.homebrew:13292 uk.radio.amateur:10833 I have just bought an ICOM IC-2SAT minus instuction manual. can anyone help me with the following points:- 1) does this radio have a tone burst for reapeter use ,if so how is it operated? 2) my radio seems to have rx 100-200 Mhz and tx 140-150Mhz but the disply will read 0-1300 Mhz. does this mean it can be made to receive from 0-1300 Mhz if so how? 3)does anyone know of any other mods or add-on modules for the 2-sat ? i would be greatful of any help or details on this radio.. THANX ROB!!!!! From lwbyppp@epix.net Tue Feb 13 21:00:52 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!warwick!tank.news.pipex.net!pipex!demon!mail2news.demon.co.uk!microvst.demon.co.uk From: "Anthony R. Gold" Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: ICOM IC-2SAT HELP!? Date: Mon, 12 Feb 96 13:58:26 GMT Organization: Microvest Limited, London Lines: 25 Message-ID: <824133506snz@microvst.demon.co.uk> References: <4fm7ts$no7$1@mhade.production.compuserve.com> <4fncpo$kq4@info-server.surrey.ac.uk> Reply-To: tgold@microvst.demon.co.uk X-NNTP-Posting-Host: microvst.demon.co.uk X-Newsreader: Demon Internet Simple News v1.30 X-Mail2News-Path: microvst.demon.co.uk Xref: news.epix.net rec.radio.amateur.equipment:24868 rec.radio.amateur.homebrew:13293 uk.radio.amateur:10838 In article <4fncpo$kq4@info-server.surrey.ac.uk> P.Manning@ee.surrey.ac.uk "Philip Manning" writes: > To Rob, You had better alter your Compuserve address, otherwise mail will > bounce, bring your address CompuServe.COM down to lower case, otherwise you > might not get any mail at all, if somebody copies it verbatim. > > Best to address it Internet:100623.303@compuserve.com I think that Rob has it right. Internet email host names are case insensitive. (But user names may not be.) Compuserve's mail system will definitely not bounce this and your host system should get the correct address from the dns with this name, if it isn't broken. Judging from the six copies of the posting you sent, I wouldn't bet on that. BTW, the format of `Best address' which you suggest is perfect for sending email from one CompuServe user to another Comuserve address but via Compuserve's Internet gateway, which is a fairly unusual thing to do. Regards, -- Tony - G3SKR / AA2PM email: tgold@panix.com tgold@microvst.demon.co.uk packet: g3skr@n0ary.#nocal.ca.usa.na From lwbyppp@epix.net Tue Feb 13 21:00:53 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet From: Philip Manning Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: ICOM IC-2SAT HELP!? Date: 12 Feb 1996 12:47:42 GMT Organization: University of Surrey, Guildford, England Lines: 11 Message-ID: <4fncte$l2q@info-server.surrey.ac.uk> References: <4fm7ts$no7$1@mhade.production.compuserve.com> NNTP-Posting-Host: olympus.ee.surrey.ac.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.3 sun4m) To: 100623.303@CompuServe.COM X-URL: news:4fm7ts$no7$1@mhade.production.compuserve.com Xref: news.epix.net rec.radio.amateur.equipment:24873 rec.radio.amateur.homebrew:13298 uk.radio.amateur:10846 To Rob, You had better alter your Compuserve address, otherwise mail will bounce, bring your address CompuServe.COM down to lower case, otherwise you might not get any mail at all, if somebody copies it verbatim. Best to address it Internet:100623.303@compuserve.com Phil G1LKJ Sorry cannot comment on the IC-2SAT. I have a IC2WE though which is very similar. From lwbyppp@epix.net Tue Feb 13 21:00:54 1996 Path: news.epix.net!news.sprintlink.net!fish.pond.com!kd3bj!jolt.pagesat.net!netserv.com!aimnet.com!news.exodus.net!imci4!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: n1mm@aol.com (N1MM) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Kenwood 241 Date: 10 Feb 1996 12:22:51 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 22 Sender: root@newsbf02.news.aol.com Message-ID: <4fik9b$b03@newsbf02.news.aol.com> References: <4fh3t1$dkt@felix.teclink.net> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4fh3t1$dkt@felix.teclink.net>, Thomas Martin writes: >Does anyone know what causes the infamous problem with the 241 >display going haywire? It has to be documented somewhere. I >know 4 people with the same problem in my area but noone knows >how to fix it. > > If the author above is referring to a Kenwood TM-241, then I have the same problem, and would love to see an answer to his query. Sometimes the display looks fine... Right now, all of the horizontal segments are on, and a few of the vertical ones. It is *really* annoying, but I don't want to give up usage of my packet radio to get it fixed. It seems to have no affect on operation, just the display. Thanks. Tom - N1MM Tom - N1MM From lwbyppp@epix.net Tue Feb 13 21:00:54 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.kornet.nm.kr!agate!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!jazz!butch From: butch@maestro.maestro.com (' ALLAN W. BART) Subject: Looking For Good Transformer Message-ID: Organization: Maestro Technologies, Inc. X-Newsreader: TIN [version 1.2 PL0] Date: Sun, 11 Feb 1996 14:25:46 GMT Lines: 9 Hello, I have talked about building a linear for years and I have collected all of the parts,however, the transformer that I have is no match in quality for the 120mf oil capacitor, and I would also like a high quality bandswitch- 7 or more positions at 10kv would be nice. So tell me what you have, btw I am located in New York City. allan From lwbyppp@epix.net Tue Feb 13 21:00:55 1996 Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet From: wave@mindspring.com (Pieter Ibelings) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.space,rec.radio.scanner,rec.radio.swap,rec.video.cable-tv,rec.video.satellite.dbs,rec.video.satellite.tvro Subject: Looking for interconnection cable for HP8505, 8501 or 8750 Date: 13 Feb 1996 03:06:43 GMT Organization: -.-. --.- -.. -..- Lines: 11 Message-ID: <4fov83$s7k@brickbat.mindspring.com> NNTP-Posting-Host: wave.mindspring.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Xref: news.epix.net rec.radio.amateur.equipment:24880 rec.radio.amateur.homebrew:13304 rec.radio.amateur.space:6314 rec.radio.scanner:45466 rec.radio.swap:57386 rec.video.cable-tv:19567 rec.video.satellite.dbs:23079 rec.video.satellite.tvro:23110 I am in desperate need of a couple interconnection cables for the HP8505 network Analyzer. The cable is a D-connector with 17 pins and 7 coax cables, but only six are used. If you have any info on where I can find some I would appreciate it. Thanks AC4OP Pieter wave@mindspring.com http://www.mindspring.com/~wave From lwbyppp@epix.net Tue Feb 13 21:00:56 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!caen!night.primate.wisc.edu!nntp.msstate.edu!gatech!newsxfer2.itd.umich.edu!chi-news.cic.net!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!csn!news.usafa.af.mil!usenet From: DICENSODJ%DFL@pcmail.usafa.af.mil (Tired of the question...) Newsgroups: rec.radio.amateur.homebrew Subject: Re: MFJ QRP SSB Rigs - Worth the $$? Date: Fri, 09 Feb 1996 20:50:49 GMT Organization: United States Air Force Academy Lines: 25 Message-ID: <4fgcbt$ouh@usafa2.usafa.af.mil> References: <49voub$kvj@usafa2.usafa.af.mil> <4a59nc$4a@jethro.Corp.Sun.COM> NNTP-Posting-Host: dfl52.usafa.af.mil X-Newsreader: Forte Free Agent 1.0.82 Greetings! Thanks for all of your E-Mails and posted responses. Just got a winning suggestion, well, a couple of 'em, actually, that make fundamental sense to me... I think I'll put a second battery in my 4x4 and use my favorite Atlas 210x when 'wheeling and "car camping"... and I'll go for a kit like the NorCal 20m/75m SSB QRP rig for backpacking. Great! Thanks again for all of your inputs and recommendations! -- Dave P.S. BTW, I got nothing but praise for the MFJ SSB rigs, even though it looks like I'll probably not go that route. From lwbyppp@epix.net Tue Feb 13 21:00:57 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.math.psu.edu!news.cac.psu.edu!drm6!drm6 From: drm6@psu.edu (Drew R. McGhee) Newsgroups: rec.radio.amateur.homebrew Subject: Multiplexing was Re: Stereo xmitter chip? Date: Mon, 12 Feb 1996 20:38:01 GMT Organization: CAC Lines: 18 Message-ID: References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> <4fglva$8cv@madeline.INS.CWRU.Edu> NNTP-Posting-Host: zag.aa.psu.edu X-Authinfo-User: drm6@psu.edu X-Newsreader: Trumpet for Windows [Version 1.0 Rev B] Other stuff deleted >I don't know if multiplex transmitting is >legal on the ham bands. > --David >-- >David Kazdan, M.D., Ph.D dxk10@po.cwru.edu; Amateur Radio: AD8Y Greetings to David and the group, I believe ATV qualifies as a multiplexed signal. So yes, multiplexed signals are permitted on the ham bands. Drew R. McGhee, KA3EJV Altoona, PA From lwbyppp@epix.net Tue Feb 13 21:00:58 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!imci5!pull-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: rickcrider@aol.com (RICKCRIDER) Newsgroups: rec.radio.amateur.homebrew Subject: Need ID: Motorola final/ MRF327-8851 Date: 11 Feb 1996 04:18:04 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 13 Sender: root@newsbf02.news.aol.com Message-ID: <4fkc8c$1gq@newsbf02.news.aol.com> Reply-To: rickcrider@aol.com (RICKCRIDER) NNTP-Posting-Host: newsbf02.mail.aol.com Peering inside of an amplifier that I aquired at a military surplus store, trying to figure out what band it is for and what the power output is. It takes a 28v DC power supply. Has 'N' type connectors for in and out. Made by 'TPL Com Inc. Inside there are five identical circuit boards tied together, with the heart of each board appearing to be Motorola brand finals. White ceramic looking discs, about 1/2" in diameter and 1/8" thick. On them is the Motorola logo and the following: MRF327 (on the top line) and 8851 directly under the top line. Any techies out there know what frequencies these may operate at, and at what power output? I really have no idea what I have here. It is modern, and brand new. Just don't know how to figure out what it was made for. From lwbyppp@epix.net Tue Feb 13 21:00:59 1996 Path: news.epix.net!news.sprintlink.net!news.icon.net!imci2!news.internetMCI.com!imci4!newsfeed.internetmci.com!in1.uu.net!news.iii.net!news From: "Thomas C. J. Sefranek" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need ID: Motorola final/ MRF327-8851 Date: 11 Feb 1996 11:56:37 GMT Organization: SRC Lines: 9 Message-ID: <4fkli8$k1c@news.iii.net> References: <4fkc8c$1gq@newsbf02.news.aol.com> NNTP-Posting-Host: wa1rhp.iii.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 16bit) To: rickcrider@aol.com MRF327 information is available from the Motorola web site. MRF327 80Watts 100-500 Mhz. Enjoy Tom WA1RHP From lwbyppp@epix.net Tue Feb 13 21:01:00 1996 Path: news.epix.net!news.sprintlink.net!news.uoregon.edu!classic.iinet.com.au!yarrina.connect.com.au!news.mira.net.au!Germany.EU.net!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: stevebragg@aol.com (SteveBragg) Newsgroups: aus.electronics,aus.radio.amateur.misc,rec.radio.amateur.homebrew,sci.electronics.components Subject: Re: Need VCO, 1-2 gHz - circuit or off-shelf Date: 7 Feb 1996 11:38:18 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 21 Sender: root@newsbf02.news.aol.com Message-ID: <4fakhq$gaf@newsbf02.news.aol.com> References: Reply-To: stevebragg@aol.com (SteveBragg) NNTP-Posting-Host: newsbf02.mail.aol.com Xref: news.epix.net aus.electronics:1742 aus.radio.amateur.misc:425 rec.radio.amateur.homebrew:13280 sci.electronics.components:2140 Steve, Z-Communications in USA will sell you a single piece part. I personally have built a 1296-MHz synthesizer around their VCO, and they are quite linear and predictable. Z-COMM has VCO's to at least 2.4 GHz, and they are in the US$10 to US$25 price range (13.40 to 33.50 Aussie $, 1992 exchange; sorry, it's the most current rate I have). Write or call them at: Z-Communications 9939 Via Pasar San Diego, CA 92126 USA USA TEL (619) 621-2722 Best of luck, and let me know how it comes out. Steve Bragg, KA9MVA Stillwater, Oklahoma, USA E-Mail: steveb@fesi.com or SteveBragg@aol.com Web Page: http://members.aol.com/SteveBragg/private/ka9mva USA Tel: (405) 377-8288 From lwbyppp@epix.net Tue Feb 13 21:01:01 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!cornellcs!newsstand.cit.cornell.edu!news.tc.cornell.edu!news.cac.psu.edu!news.math.psu.edu!chi-news.cic.net!news.uiowa.edu!crpl.cedar-rapids.lib.ia.us!SABINW From: sabinw@crpl.cedar-rapids.lib.ia.us Newsgroups: rec.radio.amateur.homebrew Subject: noise source Date: 12 Feb 1996 14:05:56 GMT Organization: Cedar Rapids Public Library, Cedar Rapids, IA, 52401 Lines: 7 Distribution: world Message-ID: <4fnhg4$tqe@flood.weeg.uiowa.edu> Reply-To: SABINW@crpl.cedar-rapids.lib.ia.us NNTP-Posting-Host: crpl.cedar-rapids.lib.ia.us >There was a thread running a couple of weeks back on construction of a >diode noise source that was described in QST. That article is "A Calibrated Noise Source for Amateur Radio" by W.E. Sabin, in the May 1994 QST. This article is also found in the ARRL Handbook, 1995/1996 editions. From lwbyppp@epix.net Tue Feb 13 21:01:02 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in1.uu.net!alterdial.uu.net!not-for-mail From: David Nulton Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 10 Feb 1996 22:24:15 GMT Lines: 14 Message-ID: <4fj5uf$s9o@alterdial.UU.NET> References: NNTP-Posting-Host: node094.axiom.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: willmore@whelk.cig.mot.com I'm not a PLL expert but have worked with some simple stuff at 1Khz. I believe the design of the filter will affect the capture and lock range of the PLL. For example, too sharp a filter could easily lose lock (If I understand it right). However I think the gear shifting filter idea might work just dandy. Although depending on your application, there usually isn't much need for a really whopper filter in the PLL. Just my thoughts 73s de KI5XW From lwbyppp@epix.net Tue Feb 13 21:01:03 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!in2.uu.net!cmchub.rns.com!news.silcom.com!news.west.net!coconut!news.enteract.com!delta.misha.net!news From: msimon@rworld.com (M Simon) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: Sun, 11 Feb 1996 21:31:40 GMT Organization: Space-Time Productions Lines: 44 Message-ID: <4fln1c$mo3@delta.misha.net> References: NNTP-Posting-Host: 206.230.95.11 X-Newsreader: Forte Free Agent 1.0.82 willmore@whelk.cig.mot.com (David A Willmore) wrote: >It seems that every time I look for information on PLL loop filter design, >they focus on simple implementation of the loop filter. Is it because >simple one or two pole filters are the ideal filters for this use or >is there some other design constraint involved? The filter only has to >work in the audio range--from my understanding. Would a brick wall, low >pass filter of a high order be a better solution? What if you could widen >the passband while tuning and narrow it down once you have aquired lock? >Maxim has some nice eighth order switched capacitor filters which could >easily fill this role. They are clocked at 100 times the highest passed >frequency and are available in the three classic filter topoligies. It >would be easy to put in a 1MHz clock with a 10x prescaler for a wide >passband and then increase the prescaler value (eight bit counter) when >the PLL has locked. Would this do what I think and decrease phase noise? >Just a few thoughts and questions. BTW, anyone have a good VCO design for >60.7 to 64.7 MHz? :) >Cheers, >David N0YMV >Disclaimer: I don't speak for Motorola. You should talk with some Mot. engineers in Illinois they could provide you with good info. The problem with the Maxim filters is noise. High order filters are more prone to ringing which increases settling times. Mot. has some good books on PLL's get them. Changing the loop BW is sometimes done if needed. Adds complication. Simon M. Simon is a Master in The Ascended Bastard School of Yoga msimon@rworld.com Our Aim is Money and Power From lwbyppp@epix.net Tue Feb 13 21:01:04 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!snooze.ser.bbnplanet.com!crick.sura.net!lamarck.sura.net!newsfeed.internetmci.com!uwm.edu!math.ohio-state.edu!usc!sdd.hp.com!hp-pcd!hpcvsnz.cv.hp.com!tomb From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 10 Feb 1996 19:08:01 GMT Organization: Hewlett Packard Corvallis Site Lines: 19 Message-ID: <4fiqeh$189@hpcvsnz.cv.hp.com> References: NNTP-Posting-Host: hplsnb.lsid.hp.com David A Willmore (willmore@whelk.cig.mot.com) wrote: : It seems that every time I look for information on PLL loop filter design, : they focus on simple implementation of the loop filter. Is it because : simple one or two pole filters are the ideal filters for this use or : is there some other design constraint involved? The filter only has to : work in the audio range--from my understanding. Would a brick wall, low : pass filter of a high order be a better solution? What if you could widen : the passband while tuning and narrow it down once you have aquired lock? The problem is that the filter is part of a closed-loop feedback control system. If you have unity gain and net 360 degrees phase shift in the loop, you are going to have oscillations. Since high-order filters have large phase shifts where their gain is still high, they aren't appropriate for use in a closed loop. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Tue Feb 13 21:01:05 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!demon!saga.demon.co.uk!Steve From: Steve W Newsgroups: rec.radio.amateur.homebrew Subject: Power Supply schematic wanted Date: Sun, 11 Feb 1996 21:02:32 +0000 Organization: Widdy Lines: 14 Distribution: world Message-ID: NNTP-Posting-Host: saga.demon.co.uk X-NNTP-Posting-Host: saga.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.10 Hi all, Could anyone out there help me out with a schematic diagram to build a 13.8v 15-20A power supply, regulated and stabilised ? Thanks in advance Steve G7ULW Steve@saga.demon.co.uk -- Steve W From lwbyppp@epix.net Tue Feb 13 21:01:06 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: Fri, 09 Feb 96 03:23:15 GMT Lines: 22 Message-ID: <823880214.28577@pinetree.microserve.com> References: <823084973.2216@pinetree.microserve.com> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 I've just come across an IC in an old National data book that looks like a good candidate for building a stable VFO or PTO. It's the LM175 (derated versions are 275/375). This is an oscillator/buffer combination and the specifications regarding stability are pretty impressive: Parameter Conditions Typical Power Supply Rejection 5V < Vcc < 10V 0.1 ppm / V Temperature Rejection -55C < Ta < +125C 0.05 ppm / Deg. C Load Pull short <= RL <= open 0.01 ppm Seems to me it would be much easier to compensate an oscillator built around this IC, because the chip would eliminate many of the potential variables and problem areas of a discrete design. Does anyone know if this IC is still available, and does anyone here have any experience using it? Tnx & 73, Jack WB3U From lwbyppp@epix.net Tue Feb 13 21:01:07 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!tank.news.pipex.net!pipex!demon!pinetree From: jackl@pinetree.microserve.com (WB3U) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PTO Temperature Compensation Date: Fri, 09 Feb 96 03:28:17 GMT Lines: 22 Message-ID: <823880516.28618@pinetree.microserve.com> References: <823084973.2216@pinetree.microserve.com> <311667E0.F6B@gte.net> <4fb86a$rnu@crash.microserve.net> NNTP-Posting-Host: pinetree.microserve.com X-NNTP-Posting-Host: pinetree.microserve.com X-Newsreader: News Xpress Version 1.0 Beta #4 I've just come across an IC in an old National data book that looks like a good candidate for building a stable VFO or PTO. It's the LM175 (derated versions are 275/375). This is an oscillator/buffer combination and the specifications regarding stability are pretty impressive: Parameter Conditions Typical Power Supply Rejection 5V < Vcc < 10V 0.1 ppm / V Temperature Rejection -55C < Ta < +125C 0.05 ppm / Deg. C Load Pull short <= RL <= open 0.01 ppm Seems to me it would be much easier to compensate an oscillator built around this IC, because the chip would eliminate many of the potential variables and problem areas of a discrete design. Does anyone know if this IC is still available, and does anyone here have any experience using it? Tnx & 73, Jack WB3U From lwbyppp@epix.net Tue Feb 13 21:01:10 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!btnet!zetnet.co.uk!demon!mail2news.demon.co.uk!djwhome.demon.co.uk From: David Woolley Newsgroups: rec.radio.amateur.homebrew Subject: Re: QRP Schematics scanned and ready! Date: Sun, 11 Feb 1996 10:37:35 GMT Organization: Demon Subscriber at Home Lines: 15 Message-ID: References: <4f0sru$as8@news-f.iadfw.net> X-NNTP-Posting-Host: djwhome.demon.co.uk X-Mail2News-Path: djwhome.demon.co.uk In article , wrote: > >I think here is as good a place as any to post them. Personally I would >prefer JPEG's. I would start with one and see what kind of response you get. >They should be uuencoded first. Do not post them here. This is not a binaries group and news admins don't like hidden binaries groups; they are even more likely to block them than overt binaries groups. JPEG is not a good format for line drawings. TIFF FAX, PCX and GIF are all better at handling them (JPEG is very good for natural images, though). -- David Woolley, London, England david@djwhome.demon.co.uk From lwbyppp@epix.net Tue Feb 13 21:01:11 1996 Path: news.epix.net!news.sprintlink.net!news.bluesky.net!solaris.cc.vt.edu!hp.fciencias.unam.mx!uaem!op.net!agis!news2.net99.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!in1.uu.net!interaccess!d105.nb.interaccess.com!user From: dmoorman@interaccess.com (Dave Moorman) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QRP Schematics scanned and ready! Date: Mon, 12 Feb 1996 18:44:31 -0600 Organization: InterAccess, Chicago's best Internet Service Provider Lines: 25 Message-ID: References: <4f0sru$as8@news-f.iadfw.net> NNTP-Posting-Host: d187.nb.interaccess.com In article , David Woolley wrote: > In article , wrote: > > > >I think here is as good a place as any to post them. Personally I would > >prefer JPEG's. I would start with one and see what kind of response you get. > >They should be uuencoded first. > > Do not post them here. This is not a binaries group and news admins don't > like hidden binaries groups; they are even more likely to block them than > overt binaries groups. Amen! They are likely to be cancelled by admins. Post them to alt.binaries.pictures.misc. and post a message here saying they are there. Then we'll know where to go to get them. Dave Moorman, K9SW Downers Grove, Illinois, USA From lwbyppp@epix.net Tue Feb 13 21:01:12 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.cyberramp.net!egsner!convex!newshost.convex.com!news.dfw.net!imci4!newsfeed.internetmci.com!usenet.eel.ufl.edu!news.ultranet.com!amber1.ultranet.com!user From: acj@ultranet.com (Jon Goguen) Newsgroups: rec.radio.amateur.homebrew Subject: QST Noise Source Article? Date: 12 Feb 1996 01:40:29 GMT Organization: UltraNet Communications, Inc. Lines: 8 Message-ID: NNTP-Posting-Host: amber1.ultranet.com X-Newsreader: Value-Added NewsWatcher 2.0b22.0+ There was a thread running a couple of weeks back on construction of a diode noise source that was described in QST a couple of years ago. Anyone have the exact reference so I can order the acticle via inter-library loan? Thanks, Jon From lwbyppp@epix.net Tue Feb 13 21:01:13 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!multiverse!library.erc.clarkson.edu!rpi!uwm.edu!vixen.cso.uiuc.edu!howland.reston.ans.net!nntp.coast.net!news.net99.net!news.cyberg8t.com!host15.cyberg8t.com!user From: john@anawave.com (John) Newsgroups: rec.radio.amateur.homebrew Subject: Repair: Memorex 4010 TV Date: 7 Feb 1996 20:58:55 GMT Organization: Cyberg8t Internet Services (800) 399-4NET Lines: 41 Message-ID: NNTP-Posting-Host: host15.cyberg8t.com I have a Memorex TM-4010(made for Tandy) Screen TV(for ATV) that has recently lost it picture and Sound. I checked fuses on the power supply and one near the Flyback transformer. I feed video and audio from a VCR to the "F" connector on the back. Nothing. I then tried feeding audio and video from the RCA jack on the VCR to the RCA jacks on the TV. I then get audio but no video. My first guess is the tuner has died. Is there anything else I should try before buying a tuner? Where is a good source for TV tuners? 73 de John KN6LH (714)-324-6320 ------------------------------------------------------ | AX25: KN6LH@K6VE.#SOCAL.CA.NA.USA | | tcp/ip: kn6lh@kn6lh.ampr.org | | Internet: john@anawave.com | | kn6lh@anawave.com | | URL: http://www.anawave.com/~kn6lh | | Snail Mail: John Fay | | P.O. Box 1271 | | Claremont CA 91711 | | | ------------------------------------------------------ -- 73 de John KN6LH ------------------------------------------------------ | AX25: KN6LH@K6VE..#SOCAL.CA.NA.USA | | tcp/ip: kn6lh@kn6lh.ampr.org | | Internet: john@anawave.com or | | kn6lh@anawave.com | | http://www.anawave.com/~kn6lh | ------------------------------------------------------ From lwbyppp@epix.net Tue Feb 13 21:01:14 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!khis_news.khis.kodak.com!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!newsfeed.internetmci.com!swrinde!cssun.mathcs.emory.edu!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Repair: Memorex 4010 TV Message-ID: <1996Feb9.085323.10720@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: Date: Fri, 9 Feb 1996 08:53:23 GMT Lines: 37 In article john@anawave.com (John) writes: >I have a Memorex TM-4010(made for Tandy) Screen TV(for ATV) that has >recently lost it picture and Sound. > >I checked fuses on the power supply and one near the Flyback transformer. >I feed video and audio from a VCR to the "F" connector on the back. >Nothing. I then tried feeding audio and video from the RCA jack on the VCR >to the RCA jacks on the TV. I then get audio but no video. >[ >My first guess is the tuner has died. Is there anything else I should try >before buying a tuner? You might try feeding *RF* to the tuner. That's what the F connector is for, RF not video. But that's probably what you meant to say anyway. Now you've got audio, so you know the TV is getting power. You don't have video when you feed video to the set (I'm assuming here that you're *really* feeding video to the set, and not just RF to the wrong port). Now the direct video input is *after* the tuner, since video is the *demodulated* RF from a TV transmission, so whether the tuner is bad or not is irrelevant, you've got video display problems. Do you have a raster? To check that, turn the brightness all the way up, the screen should turn grey. If it doesn't, you may have a high voltage problem, or an open filament in the CRT. If you do have a raster, then you've got video amplifier problems. (This could be as simple as a *switch* set incorrectly to tuner when you are feeding direct video, or vice versa, or it could be an actual video amplifier problem.) In any event, forget the tuner for now, get the video display to work first, then we'll see if there's a tuner problem. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Tue Feb 13 21:01:15 1996 Path: news.epix.net!news.sprintlink.net!news.localnet.com!intac!newsstand.cit.cornell.edu!ub!csn!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: thinker335@aol.com (Thinker335) Newsgroups: rec.radio.amateur.homebrew Subject: RF remote control link to toy. Date: 10 Feb 1996 18:12:31 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 16 Sender: root@newsbf02.news.aol.com Message-ID: <4fj8ov$i24@newsbf02.news.aol.com> Reply-To: thinker335@aol.com (Thinker335) NNTP-Posting-Host: newsbf02.mail.aol.com I am interested in making a remote controlled toy robot that has a relatively high BW ( ~ 19.2 Kbaud) full duplex (if possible) connection to a computer base station. I don't want to violate FCC regulations, and I don't want to have to get a license. Except for the 900 - 928 MHz spread specturm band, is there any portion of the spectrum that allows unlicensed usage of this type ? Also, what do frequencies are used for commercially available radio controlled toys ? How would I find information on FCC regulations on the RF spectrum < 1 GHz ? Thanks in advance. From lwbyppp@epix.net Tue Feb 13 21:01:16 1996 Path: news.epix.net!uunet!in2.uu.net!inews.intel.com!usenet From: Dave Curtis Newsgroups: rec.radio.amateur.homebrew Subject: Re: RF remote control link to toy. Date: 13 Feb 1996 16:53:44 GMT Organization: Intel Microcomputer Software Laboratories Lines: 37 Message-ID: <4fqfmo$t03@inews.sc.intel.com> References: <4fj8ov$i24@newsbf02.news.aol.com> NNTP-Posting-Host: 143.183.124.181 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 32bit) To: thinker335@aol.com thinker335@aol.com (Thinker335) wrote: > >I am interested in making a remote controlled toy robot that has a >relatively high BW ( ~ 19.2 Kbaud) full duplex (if possible) connection to >a computer base station. > >I don't want to violate FCC regulations, and I don't want to have to get a >license. Except for the 900 - 928 MHz spread specturm band, is there any >portion of the spectrum that allows unlicensed usage of this type ? Perhaps the ISM (Industrial/Scientific/Medical) band(s) -- there is one around 2.3GHz, shared with a ham band. > >Also, what do frequencies are used for commercially available radio >controlled toys ? I know of three bands, to my knowledge limited to one of 2 modulation schemes. One sold as "FM", where PPM servo control data is FM modulated, and "PCM" wher e digital servo control data is sent as a digital code. "AM" has been phased ou t. There are some channels in the 27 MHz CB band -- good luck here. R/C flyers a bandoned this band a long time ago due to encroachment from illegal CB voice communicat ions. (There, I said that as nicely as I could.) There are some frequencies allocated for R/C in the 50 MHz ham band, you need a Technician class ham license here. And then there is a band at 72 MHz, betwee n TV channels 4 & 5. Also, there are toys with low power transmitters operating under part 15 rules at 49 MHz. > >How would I find information on FCC regulations on the RF spectrum < 1 >GHz ? > >Thanks in advance. -Dave NG0X From lwbyppp@epix.net Tue Feb 13 21:01:17 1996 Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: SB220 HELP NEEDED Date: 9 Feb 1996 11:52:42 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 25 Sender: root@newsbf02.news.aol.com Message-ID: <4ffu4q$dt1@newsbf02.news.aol.com> References: <4fb50u$k5v@swsu65.swmed.edu> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader >I have a Heathkit SB 220 amp that has a problem with the high voltage >power supply. Every time I key down, the high voltage drops considerbly. >I have heard that the HV supply leaves a lot to be desired and that the >tubes in the amp are not running at their real potential. Does anyone >have any info on how to improve the HV supply in this amp? I did a few PA designs for Heath. Let me say this. The SB-220 was designed to run 1 KW INPUT, or 600 watts out on carrier, and 2 KW PEP SSB input, or ~1200 watts PEP (no more than 600 watts average) out on SSB. The cooling, transformer, and other things are perfectly selected if you follow the manual. If you try to run the full capability of the 3-500's, the entire amp needs re-designed. >I suspect that the caps may be old. Does this sound like it could be >the problem? Not if the amp's RF output isn't "humming" excessively on a single tone carrier (CW keydown) test. How much is it dropping? It could be normal. That isn't the stiffest supply in the world. And what type of house wiring are you using? 73 Tom >Any help would be welcomed. > >Thank you.......KC6HVI From lwbyppp@epix.net Tue Feb 13 21:01:19 1996 Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!nntp.inc.net!news.sol.net!daily-planet.execpc.com!spool.mu.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!shore!news3.near.net!transfer.stratus.com!usenet From: Scott Adams Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematics going to a web page Date: 9 Feb 1996 23:44:10 GMT Organization: Stratus Computer Inc, Marlboro MA Lines: 23 Message-ID: <4fgm8a$j4g@transfer.stratus.com> References: <4faim2$7ll$1@mhafn.production.compuserve.com> NNTP-Posting-Host: coyoacan.sw.stratus.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1 (X11; U; SunOS 4.1.3_U1 sun4c) X-URL: news:4faim2$7ll$1@mhafn.production.compuserve.com Jay WB0VNE wrote: > was a draftsman and the engineer was not involved in that stage. A better > approach is to use some electronic format that includes the parts, connectio ns > and can create a netlist. One other desired feature is ASCII format so we > can send it back and forth without UUEncoding etc. My (highly Jaded) view > is to use CIRCAD. It meets all of the above and the program also works with > OrCAD, Tango, Protel, ACAD and other files. The demo is free so everyone > can view files. The demo also lets you write (aprox 32K) files so we can > all exchange small files cheaply. So, thats my 2 cents worth. Thanks for > the new WEB Site! I'm looking around for a modestly-priced, PC-compatible (ie: MSWin 3.1 or MSDOS) schematic pkg, preferably with compatible PC-board layout (decent auto-router would be nice). I've not heard of CIRCAD; would this qualify as modestly-priced (ie: hobby - I don't consider any of those you mentioned to fi t this catagory)? Any suggestions for such a beast? Suggestions appreciated (of the non-flame type)... Scott Adams scotta@sw.stratus.com From lwbyppp@epix.net Tue Feb 13 21:01:20 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!news.mindspring.com!uunet!in1.uu.net!alterdial.uu.net!not-for-mail From: David Nulton Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematics going to a web page Date: 11 Feb 1996 16:52:44 GMT Lines: 15 Message-ID: <4fl6ss$p68@alterdial.UU.NET> References: <4faim2$7ll$1@mhafn.production.compuserve.com> <4fgm8a$j4g@transfer.stratus.com> NNTP-Posting-Host: node094.axiom.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Have you heard of "PADS"? It is a circuit schematic editor, and PCB layout program. I believe it comes in a Sharware or lite version. I had a copy but played with it very little. It does do the job though - definately not as well as a high dollar program, but it does work. I did have some problems getting it to run properly, but my system was lacking memory and running on a 386 chip. I don't know how you can find it, but it should be out there somewhere. It is definately worth trying out if you can get a copy. Some neat features are the ability to interface with SPICE and has several export/import formats for both schematics and PCB layout. 73s KI5XW Dave From lwbyppp@epix.net Tue Feb 13 21:01:21 1996 Path: news.epix.net!news.sprintlink.net!bga.com!realtime.net!news.mindspring.com!uunet!in1.uu.net!alterdial.uu.net!not-for-mail From: David Nulton Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematics going to a web page Date: 11 Feb 1996 16:52:13 GMT Lines: 15 Message-ID: <4fl6rt$p68@alterdial.UU.NET> References: <4faim2$7ll$1@mhafn.production.compuserve.com> <4fgm8a$j4g@transfer.stratus.com> NNTP-Posting-Host: node094.axiom.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: scotta Have you heard of "PADS"? It is a circuit schematic editor, and PCB layout program. I believe it comes in a Sharware or lite version. I had a copy but played with it very little. It does do the job though - definately not as well as a high dollar program, but it does work. I did have some problems getting it to run properly, but my system was lacking memory and running on a 386 chip. I don't know how you can find it, but it should be out there somewhere. It is definately worth trying out if you can get a copy. Some neat features are the ability to interface with SPICE and has several export/import formats for both schematics and PCB layout. 73s KI5XW Dave From lwbyppp@epix.net Tue Feb 13 21:01:22 1996 Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!nntp.inc.net!news.sol.net!uniserve!van-bc!news.cyberstore.ca!math.ohio-state.edu!howland.reston.ans.net!newsfeed.internetmci.com!in1.uu.net!alterdial.uu.net!not-for-mail From: David Nulton Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Subject: Screwdriver Ant. Plans Wanted Date: 10 Feb 1996 00:03:01 GMT Lines: 6 Message-ID: <4fgnbl$5f6@alterdial.UU.NET> NNTP-Posting-Host: node094.axiom.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) Xref: news.epix.net rec.radio.amateur.homebrew:13270 rec.radio.amateur.antenna:19005 Does anyone know of a resource for building a screwdriver antenna? Perhaps a net resource, magazine article etc. Thanks and 73s de KI5XW From lwbyppp@epix.net Tue Feb 13 21:01:22 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.cyberramp.net!uunet!in2.uu.net!news.iadfw.net!usenet From: kmiller@airmail.net (Kerry W. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: Re: software for mfj-1278 tnc Date: Sun, 11 Feb 1996 05:51:37 GMT Organization: customer of Internet America Lines: 18 Message-ID: <4fk06d$mu2@news-f.iadfw.net> References: <199602110449.OAA05293@dyson.brisnet.org.au> NNTP-Posting-Host: dal14-15.ppp.iadfw.net X-Newsreader: Forte Free Agent 1.0.82 peterw@dyson.BRisnet.ORG.AU (Peter L. Williamson) wrote: >Hello all, > I amlooking for some software to use all the functions of the mfj >1278 multimode tnc. I am sure I saw somewhere a program described that does >all the functions (but much better ) than multicom 3.1. Unfortunately I did >not bookmark the site or program name, can you help????. >regards Peter L. Williamson VK4AWP. I'm using multicom, but I have a friend using a program from Canada called "Skyrider". I don't think it supports fax and maybe other video modes though. He said that he saw it in an ad in a magazine. Sorry but that's all I remember about it. 73, Kerry kmiller@airmail.net From lwbyppp@epix.net Tue Feb 13 21:01:24 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!hookup!gatech!news.radio.org!wa4mei!ke4zv!gary From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Switching Power Supplies Message-ID: <1996Feb10.015437.15009@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) Organization: Destructive Testing Systems References: <4fgk2v$b5s@suba01.suba.com> Date: Sat, 10 Feb 1996 01:54:37 GMT Lines: 45 In article <4fgk2v$b5s@suba01.suba.com> byoung@qni.com writes: >Folks, > >Should a switching power supply be used to supply power to >radio equipment? Does it introduce problems I want to avoid? >(This question comes up because I have ready access to some >200 watt power supplies that have been "pulled" from PCs...) Switchers *can* work fine for powering amateur equipment, witness the Icom and Yaesu switching supplies. *However*, the switcher used must be designed to work with the radio in several respects. First, it must maintain regulation across the wide current load demands from a few milliamps to 20 amps that a radio may present. Many switching supplies require a *minimum* load or they lose regulation (often disasterously by going to a very high voltage). Second, it must adequately suppress switching hash. Switchers are inherently generators of high harmonic content. This has to be suppressed or you'll pickup the hash in the radio. Third, the power supply must be tolerant of a high RF environment. Switchers are often sensitive to stray RF, which can cause them to lose regulation (sometimes with disasterous consequences). Now the PC power supply presents special problems in this regard. It requires a minimum load on the 5 volt bus to function. So if you're going to use it to power 12 volt equipment, you're going to have to put a "dummy load" on the 5 volt bus to make it work correctly. Most PC switchers require at least a 2 amp draw on the 5 volt bus to function correctly. And of course the PC supply can only source 2 amps on the 12 volt line, so it is *really* only a 24 watt 12 volt supply. Most of that 200 watt rating is on the 5 volt bus where it normally supplies *large* amounts of current. I'd just strip them for parts. There are some good parts inside there, including some nice capacitors you could use in the power supply of your tube amplifier projects. Gary -- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us Lawrenceville, GA 30244 | | From lwbyppp@epix.net Tue Feb 13 21:01:25 1996 Path: news.epix.net!news.sprintlink.net!aimnet.com!news.exodus.net!uunet!in2.uu.net!alterdial.uu.net!not-for-mail From: David Nulton Newsgroups: rec.radio.amateur.homebrew Subject: Re: Switching Power Supplies Date: 10 Feb 1996 22:20:50 GMT Lines: 12 Message-ID: <4fj5o2$s9o@alterdial.UU.NET> References: <4fgk2v$b5s@suba01.suba.com> NNTP-Posting-Host: node094.axiom.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: byoung@qni.com It all depends on what you want to run with your power supply. Switchers do introduce some noise, but most are well filtered and out of the audio and amateur bands. The hard part is finding a switcher that can handle the load. For example, a 200 watter is 15 amps approx, barely enough for a solid state HF rig. Also note that your 200 watt supply is more than likely only rated for an amp or two at 12 volts. Usually all the ooommmpph is in the 5 volt supply. -dnult KI5XW From lwbyppp@epix.net Tue Feb 13 21:01:26 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!news2.ee.net!news.ee.net!imci2!news.internetMCI.com!imci4!newsfeed.internetmci.com!news.smart.net!news From: theresa@ttttt.smart.net Newsgroups: rec.radio.amateur.homebrew Subject: tech info Date: Sun, 11 Feb 96 05:29:54 PDT Organization: Smartnet Internet Services [via news] Lines: 26 Message-ID: NNTP-Posting-Host: ttttt.smart.net Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage I have some questionable chips used in a keyboar in an electric typewriter and I'm going to try to get them locally if possible. If someone has a couple of minutes, could you please post substitution numbers on these chips. Fairchild or TI numbers should be be fine. Chip #1: Mostek 8509 MK23128 MK 23032N-25 Chip #2: NEC 8430x8 Chip #3: AMD 8349MPA P8031 Thanks for the help email; theresa@ttttt.smart.net From lwbyppp@epix.net Tue Feb 13 21:01:27 1996 Path: news.epix.net!news.sprintlink.net!news.us.world.net!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!tank.news.pipex.net!pipex!demon!ifwtech.demon.co.uk!G3SEK From: "Ian White, G3SEK" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Use for ferite materials??? Date: Mon, 12 Feb 1996 22:10:21 +0000 Organization: IFW Technical Services Lines: 28 Distribution: world Message-ID: <9wMd6CANr7HxEwQd@ifwtech.demon.co.uk> References: <311F3E9A.34C5@ix.netcom.com> NNTP-Posting-Host: ifwtech.demon.co.uk X-NNTP-Posting-Host: ifwtech.demon.co.uk MIME-Version: 1.0 X-Newsreader: Turnpike Version 1.11 <9qI82xurdT5+z2vSgnCPFcKgQL> In article <311F3E9A.34C5@ix.netcom.com>, Steven B Reed wrote: >Hello all, > I work at a large CRT manufacturer, and they throw away a large >quanity of defection yokes. I have saved a few from the landfill, >(mostly for the enameled copper wire), and have discovered what appears >to be a large cone of ferite looking material. I know that this "stuff" >can be used to make chokes and the like. My question is, can these >half cone shapes be used for anything usefull? Now that I have them >home I would rather do something with them besides just pitching them in >MY trash. > Keep them in the original pairs! G0SNO of the RSGB EMC committee has found that they make excellent RF chokes for heavy AC line currents, with just the right combination of permeability and physical size. Wind the whole line cord about 10 turns through the cone, and it'll be resonant in the mid-HF region. You could even do the same with RG213 for a monster feedline choke. They don't look pretty but they do work, and scrap deflection yokes are usually available free at the back door of the local TV repair shop. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From lwbyppp@epix.net Tue Feb 13 21:01:28 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!ratty.wolfe.net!news.aa.net!tsunami.ixa.net!uunet!in1.uu.net!newsfeed.internetmci.com!info.ucla.edu!ihnp4.ucsd.edu!news.service.uci.edu!ttinews!avatar!sorgatz From: sorgatz@avatar.tti.com (Erik K.Sorgatz) Subject: Re: VOX Circuit? Message-ID: Sender: usenet@ttinews.tti.com Nntp-Posting-Host: avatar Organization: Citicorp TTI References: <4f619i$li6@tel.den.mmc.com> Date: Thu, 8 Feb 1996 22:35:07 GMT Lines: 18 In article <4f619i$li6@tel.den.mmc.com> "joseph c. hawkins" writes: >Any sample VOX circuits or info of where to get info would be greatly >appreciated. > >Thanks > > Get hold of a copy of the ARRL Handbook for 1971...swell transistor vox with easy-to-find parts and no headaches! 73! and dont breathe that flux smoke! sorgatz@avatar.tti.com (or:es@soldev.tti.com) KB6LUY (private email:eks@westwo rld.com) TTI 3100 Ocean Park Blvd. Santa Monica, CA 90405 "ANY COMMENTS OR STATEMENTS MADE ARE NOT NECESSARILY THOSE OF CITICORP, ITS SU BSIDIARIES OR AFFILIATES." (Copyright 1995, ARR-permission to store/archive hereby grante d) From lwbyppp@epix.net Tue Feb 13 21:01:29 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!torn!nott!bcarh189.bnr.ca!bmerhc5e.bnr.ca!bcarh8ab.bnr.ca!bgtyi23 From: kirkland@bnr.ca (Bill Kirkland) Newsgroups: rec.radio.amateur.homebrew Subject: Re: VOX Circuit? Date: 7 Feb 1996 14:19:51 GMT Organization: Bell Northern Research Ltd. Lines: 12 Message-ID: <4face7$6mp@bcarh8ab.bnr.ca> References: <4f619i$li6@tel.den.mmc.com> NNTP-Posting-Host: bgtyi23.bnr.ca X-Newsreader: News Xpress Version 1.0 Beta #4 Check the ARRL handbooks from the late 80s to possibly the early 90s. There is a VOX circuit in there using LM3900 current feedback op amps. I've built it and it works O.K. There is an error in the schematic regarding the 555 timer that is used. The schematic shorts out part of the 555 timer. The effect of this is to distroy part of the 555 timer. However, if the short is removed (I bent the offending pin up) the 555 timer will still do the job. If you check the 555 timer data sheet the error in the schematic will hopefully become obvious. Bill Kirkland VE3JHU From lwbyppp@epix.net Tue Feb 13 21:01:30 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: w8jitom@aol.com (W8JI Tom) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WD-40 vice Contact/Tuner Spray!! Date: 3 Feb 1996 16:29:14 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 16 Sender: root@newsbf02.news.aol.com Message-ID: <4f0k3a$qpo@newsbf02.news.aol.com> References: <4er0md$bi8@usenet.continental.com> NNTP-Posting-Host: newsbf02.mail.aol.com X-Newsreader: AOL Offline Reader In article <4er0md$bi8@usenet.continental.com>, Paul Christensen writes: > >I still have an original container of "Daven Oil" for this purpose and >use it sparingly of course. It's got to last me a lifetime! Anyone else >remember using Daven Oil? > >-Paul, N9AZ Hi Paul, They made alcohol based drinks also. I have some, it's called Daven Port. 73 Tom From lwbyppp@epix.net Tue Feb 13 21:01:31 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!howland.reston.ans.net!nntp.crl.com!crl4.crl.com!not-for-mail From: pgerba@crl.com (Peter Gerba) Newsgroups: rec.radio.amateur.homebrew Subject: WTB dud 4CX5000A; 3CX10000A-15k, 20K Date: 10 Feb 1996 07:15:49 -0800 Organization: CRL Dialup Internet Access (415) 705-6060 [Login: guest] Lines: 7 Message-ID: <4ficr5$5vk@crl4.crl.com> NNTP-Posting-Host: crl4.crl.com X-Newsreader: TIN [version 1.2 PL2] Hi; I'm looking for rebuildable 4CX5,000A, 3CX10,000, 15K, 20K duds. pete pgerba@crl.com From lwbyppp@epix.net Tue Feb 13 21:01:31 1996 Path: news.epix.net!uunet!in2.uu.net!cs.utexas.edu!howland.reston.ans.net!news.sprintlink.net!news1.sunbelt.net!usenet From: flanders@znet.groupz.net (Jerry Flanders) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.swap,rec.radio.swap Subject: Re: WTB HW-9 OR SIMILAR QRP RIG Date: Tue, 13 Feb 1996 15:36:29 GMT Organization: SunBelt.Net INTERNET Access Lines: 12 Message-ID: <4fqb1r$stj@news1.sunbelt.net> References: <4fme92$htt@news1.sunbelt.net> NNTP-Posting-Host: ags-r1-p3.groupz.net X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.amateur.homebrew:13316 rec.radio.amateur.misc:98037 rec.radio.swap:57412 I am looking for a Heath HW-9 QRP rig or similar. Any condition considered, but must have manual. Accessories OK, but not required. Please quote exact condition, appearance, accessories and price. Thanks Jerry Flanders W4UKU South Carolina flanders@groupz.net From lwbyppp@epix.net Tue Feb 13 21:01:32 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!mel.dit.csiro.au!actcsiro!news.nsw.CSIRO.AU!wabbit.cc.uow.edu.au!news.une.edu.au!news.cs.su.oz.au!tmx!news.tmx.com.au!news.acay.com.au!news From: spiro evagelakos (spiroe@acay.com.au) Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap Subject: WTB:5KW AM Transmitter Date: 12 Feb 1996 10:19:25 GMT Organization: ACAY Network Computing P/L, Sydney AUSTRALIA. Lines: 4 Message-ID: <4fn47d$j76@www.acay.com.au> NNTP-Posting-Host: spiroe.acay.com.au X-Newsreader: SPRY News 3.03 (SPRY, Inc.) Xref: news.epix.net aus.radio.amateur.misc:428 aus.radio.amateur.wicen:67 rec.radio.amateur.antenna:19019 rec.radio.amateur.digital.misc:14094 rec.radio.amateur.equipment:24856 rec.radio.amateur.homebrew:13283 rec.radio.amateur.misc:98001 rec.radio.scanner:45416 rec.radio.swap:57330 This time I am after a second hand 5KW AM Transmitter Regards Spiro From lwbyppp@epix.net Tue Feb 13 21:01:33 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!harbinger.cc.monash.edu.au!ns.saard.net!yarrina.connect.com.au!news.mel.connect.com.au!munnari.OZ.AU!mel.dit.csiro.au!actcsiro!news.nsw.CSIRO.AU!wabbit.cc.uow.edu.au!news.une.edu.au!news.cs.su.oz.au!tmx!news.tmx.com.au!news.acay.com.au!news From: spiro evagelakos (spiroe@acay.com.au) Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap Subject: WTB:AMATURE TRANSMITTER @ 160MTRS Date: 12 Feb 1996 10:15:25 GMT Organization: ACAY Network Computing P/L, Sydney AUSTRALIA. Lines: 5 Message-ID: <4fn3vt$j76@www.acay.com.au> NNTP-Posting-Host: spiroe.acay.com.au X-Newsreader: SPRY News 3.03 (SPRY, Inc.) Xref: news.epix.net aus.radio.amateur.misc:427 aus.radio.amateur.wicen:66 rec.radio.amateur.antenna:19018 rec.radio.amateur.digital.misc:14093 rec.radio.amateur.equipment:24855 rec.radio.amateur.homebrew:13282 rec.radio.amateur.misc:98000 rec.radio.scanner:45415 rec.radio.swap:57329 Hi , I am after a second hand amature transmitter for the 160mtr band Regards Spiro From lwbyppp@epix.net Tue Feb 13 21:01:34 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!nntp.coast.net!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.OZ.AU!mel.dit.csiro.au!actcsiro!news.nsw.CSIRO.AU!wabbit.cc.uow.edu.au!news.une.edu.au!news.cs.su.oz.au!tmx!news.tmx.com.au!news.acay.com.au!news From: spiro evagelakos (spiroe@acay.com.au) Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap Subject: WTB:LINEAR AMPLIFIER FOR 160MTR BAND Date: 12 Feb 1996 10:17:15 GMT Organization: ACAY Network Computing P/L, Sydney AUSTRALIA. Lines: 5 Message-ID: <4fn43b$j76@www.acay.com.au> NNTP-Posting-Host: spiroe.acay.com.au X-Newsreader: SPRY News 3.03 (SPRY, Inc.) Xref: news.epix.net aus.radio.amateur.misc:426 aus.radio.amateur.wicen:65 rec.radio.amateur.antenna:19017 rec.radio.amateur.digital.misc:14092 rec.radio.amateur.equipment:24854 rec.radio.amateur.homebrew:13281 rec.radio.amateur.misc:97999 rec.radio.scanner:45414 rec.radio.swap:57328 Hi , I am after a second hand linear Amplifier for the 160mtr band Regards Spiro From lwbyppp@epix.net Sat Feb 17 13:44:34 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!gatech!nntp.netrex.net!news.consultix.com!newsstand.cit.cornell.edu!ub!dsinc!netnews.upenn.edu!news From: Jeff DePolo WN3A Newsgroups: rec.radio.amateur.homebrew Subject: Re: (no subject) Date: Wed, 14 Feb 1996 14:31:55 -0500 Organization: InterMedia Interactive Software, Inc. Lines: 25 Message-ID: <312238AB.2477@intermediainc.com> References: <4ft621$vj@miwok.nbn.com> NNTP-Posting-Host: ts11-44.upenn.edu Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b5 (Win95; I) Gary, Tried to send you email but your host says you don't exist. The 1N5408 is rated for 1000V PIV, 3.0A, 125A surge, 1.0 Vf. Digi-Key has the m at 10 for $3.36. I'd replace the whole string. I don't think you'll find a beefier diode in that same package (DO-201AD). If you have enough room to work and can handle a slightly larger package, something l ike a Motorola MR760 which is rated for 6A might be a decent upgrade. I don't thi nk I've seen diodes in small packages like you will need that have PIV's larger t han 1000V, but they're probably out there somewhere. I've seen a blowout as you describe because of RF-related problems elsewhere causing a lot of radiation inside the cabinet of the amplifier. Just a quick blue flash and adios power supply. A friend of mine had the same thing happen with a single 3-500 amp sold by AEA (OEM Vectronics). --- Jeff -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Jeff DePolo WN3A Twisted Pair: H:610-337-7383 W:215-387-3059 x300 depolo@eniac.seas.upenn.edu RF: 442.1 442.2 442.4 443.45 443.8 444.15 linked Claim to Fame: I got the 1st speeding ticket on the information superhighway From lwbyppp@epix.net Sat Feb 17 13:44:35 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!miwok!usenet From: Gary Davidson Newsgroups: rec.radio.amateur.homebrew Subject: (no subject) Date: 14 Feb 1996 17:27:29 GMT Organization: North Bay Network, Inc. news server - not responsible for content Lines: 14 Message-ID: <4ft621$vj@miwok.nbn.com> NNTP-Posting-Host: castles05.castles.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2 (Windows; U; 16bit) I just bought an Amp Supply LK500 linear amp, running a pair of 3-500 tubes, and immediately blew a leg out of the HV rectifier stack. These diodes are listed as 1N5408 diodes, and there are 4 diodes in each leg of a full wave bridge. I have no idea what the ratings are on these diodes, and would appreciate info from someone who might have a reference manual. I amd also unaware of availability of these diodes at this point in time, and haven't figured out whether to replace the bad string, assuming I can locate exact replacements, or just go ahead and replace the entire string with some diodes having higher ratings than what it originally came with. All help and comments appreciated! &3, Gary, KJ6Q. From lwbyppp@epix.net Sat Feb 17 13:44:36 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!nwfocus.wa.com!calvino.alaska.net!nntp.alaska.net!news.accessus.net!news.uoregon.edu!news.emf.net!gatech!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!oleane!jussieu.fr!univ-lyon1.fr!elendir From: elendir@enst.fr (Elendir) Newsgroups: rec.radio.amateur.homebrew Subject: 1296 MHz VCO with comb filter Date: 15 Feb 1996 15:22:19 GMT Organization: ENST - Telecom Paris Lines: 19 Message-ID: <4fvj3b$k2m@tempo.univ-lyon1.fr> NNTP-Posting-Host: julia.enst.fr X-Newsreader: TIN [version 1.2 PL2] Hi ! Since I'm planning a 23 cm repeater, and I am not in the USA (!) I was thinking about buiding it on my own. And using an atomic reference (of WWW kind) to lock it. Since I want to be able to choose the input and output frequencies, I need something tuneable. I thought about comb filter with three digits, the middle one being tuned by a varicap (or PIN diode). Does anybody have any experience in this field ? Should I use a YIG instead ? Another form of filter ? What noise can I expect from such a system ? I thank you in advance for any suggestion Vince, F5RCS -- F5RCS - Worldwide Friendship through Amateur Radio ENST, Ecole Nationale Superieure des Telecommunications, Paris From lwbyppp@epix.net Sat Feb 17 13:44:37 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!atl.com!ldesot From: ldesot@atl.com (Larry DeSoto) Subject: Re: 813 Xmtr for 160M Message-ID: <1996Feb13.172422@atl.com> Sender: news@atl.com Nntp-Posting-Host: atl.com Organization: Advanced Technology Laboratories References: <287cc$63336.319@luzskru.cpcnet.com> <4fnihv$co9@kocrsv08.delcoelect.com> Distribution: usa Date: Wed, 14 Feb 1996 01:24:22 GMT Lines: 20 In article <4fnihv$co9@kocrsv08.delcoelect.com>, Tom Pfaffenbach writes: > The 1953 ARRL Handbook has an excellent design for a single 813 transmitter. It uses a 6AG7 > oscillator, 6L6 driver, 6Y6 clamper and an 813 as Power Amplifier. A Classic 1930's design! > > Fair Radio in Lima Ohio has the ART-13 available in surplus again for $150. It covers 2-18 Mhz > (and is easily re-worked for 160 thru 10 meters) and uses an 813 modulated w ith a pair of > 811's. You might have more fun rebuilding the ART if you just want to run th e 813's! > Hey, I had one of these things many years ago. Watching the autotune operate is more fun than a barrel of monkeys. What's the address for Fair Radio? -- Larry ************************* * * * Speaking for myself * * * ************************* From lwbyppp@epix.net Sat Feb 17 13:44:38 1996 Path: news.epix.net!news.sprintlink.net!lori.albany.net!news.sover.net!imci2!news.internetMCI.com!newsfeed.internetmci.com!in1.uu.net!noc.nyx.net!nyx10.cs.du.edu!not-for-mail From: lekollar@nyx10.cs.du.edu (larry kollar) Newsgroups: rec.radio.amateur.homebrew Subject: Re: A successfull recipe Date: 9 Feb 1996 21:04:19 -0700 Organization: University of Denver, Dept. of Math & Comp. Sci. Lines: 12 Message-ID: <4fh5g3$gea@nyx10.cs.du.edu> References: <4fdhuf$j0k@newsbf02.news.aol.com> NNTP-Posting-Host: nyx10.nyx.net In article <4fdhuf$j0k@newsbf02.news.aol.com>, EeebyJeeby wrote: >SAVE NOW!! FILE IS TOO LONG TO BE READ! ^^^^ | You misspelled "skip." >From: RHeyworth@aol.com 101471.2477@compuserve.com >Date: 2nd Feb 1996 10:30:14pm -- Larry Kollar, Dawsonville GA | *** Hatred is murder *** (1 Jn 3:15) lekollar@nyx.net | http://www.nyx.net/~lekollar/ "His third dimension done been re-VOKED!" From lwbyppp@epix.net Sat Feb 17 13:44:39 1996 Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!scanner.worldgate.com!rover.ucs.ualberta.ca!news.sas.ab.ca!drygalo From: drygalo@freenet.edmonton.ab.ca () Newsgroups: rec.radio.amateur.homebrew Subject: Any ham VHF prop map pgms? Date: 14 Feb 1996 18:18:48 GMT Organization: Edmonton Freenet, Edmonton, Alberta, Canada Lines: 6 Message-ID: <4ft928$ggg@news.sas.ab.ca> NNTP-Posting-Host: fn1.freenet.edmonton.ab.ca X-Newsreader: TIN [version 1.2 PL2.4] Does anyone know of a moderate cost (cheap) VHF/UHF propagation coverage mapping program out there for DOS? We have a good sprinkling of repeaters out here and it would be a usefull project to put a booklet together with coverage contours. That would make using the repeaters much easier when traveling. 73 de VE6MIL ! From lwbyppp@epix.net Sat Feb 17 13:44:40 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bofh.mi.org!frankensun.altair.com!nntp.coast.net!howland.reston.ans.net!cs.utexas.edu!news.ti.com!news.dseg.ti.com!mksim8!blair From: blair@mksim8.dseg.ti.com (Art Blair) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Anyone else read Bowick's RF circuit Design? Date: 14 Feb 1996 02:24:50 GMT Lines: 16 Message-ID: <4frh5i$d8n@mksrv1.dseg.ti.com> References: <311B7F1A@avint4.avionics.itt.com> <4fk0iv$cpl$1@mhade.production.compuserve.com> NNTP-Posting-Host: mksim8.dseg.ti.com X-Newsreader: TIN [version 1.2 PL2] ChrisBowick wrote: : I am considering an update to the book (2nd Edition) and would be : interested in any input, suggestions, corrections, etc. that any : of you might have. Perhaps we can make it an even better : reference book in the future! Since you posted without an email address I guess I'll reply here... Since you asked... How about a chapter on microstrip design? I`ve yet to find a usable book on the subject. I've seen alot of theoretical tomes with scads of waveguide theory but nothing on how to design, say, a filter with printed spiral inductors and interdigital capacitors. Luv the book, Art. From lwbyppp@epix.net Sat Feb 17 13:44:42 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!news.flinet.com!usenet From: chuck Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.noncomm,rec.radio.scanner,rec.radio.swap Subject: Broadcasting Radio Station Database for you...... Date: 12 Feb 1996 04:04:46 GMT Organization: Orchid City Software Lines: 28 Message-ID: <4fme8u$bsf@news.flinet.com> NNTP-Posting-Host: wpb46.flinet.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; U; 16bit) Xref: news.epix.net rec.radio.shortwave:70065 rec.radio.amateur.antenna:19052 rec.radio.amateur.digital.misc:14132 rec.radio.amateur.equipment:24923 rec.radio.amateur.homebrew:13323 rec.radio.amateur.misc:98059 rec.radio.amateur.policy:33090 rec.radio.amateur.space:6321 rec.radio.noncomm:5156 rec.radio.scanner:45512 rec.radio.swap:57465 Friend, A fully functional standalone Broadcasting Radio Station Database for IBM and compatibles with more than 4,000 Radio Station records already. This program covers stations on Longwave, Mediumwave, and Shortwave. Each record contains the Station name, Frequencies, Schedule, Languages, Country, and Continent. The program sorts in same order. What's needed to get it? Your EMail address and your Postal Mailing address for registration and future information via Post of other Radio Related Database programs. This information will be kept confidential. If you can read a document written in MS Word(extension is DOC), request the operating instructions for the Radio Station Database Program called Voyageur. You'll get an idea from reading this document of the Voyageur Database and what it does. Incidently, the program offered with this notice is valid until June 6, 1996. Hope to hear from you.. Chuck KA4PRF From lwbyppp@epix.net Sat Feb 17 13:44:43 1996 Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bloom-beacon.mit.edu!cambridge-news.cygnus.com!news3.near.net!news.ner.bbnplanet.net!howland.reston.ans.net!ix.netcom.com!netnews From: jami1@ix.netcom.com(Frank L. Jamison ) Newsgroups: rec.radio.amateur.homebrew Subject: Computerized Vacuum Tube List Date: 16 Feb 1996 18:30:55 GMT Organization: Netcom Lines: 6 Message-ID: <4g2igv$mv2@reader2.ix.netcom.com> NNTP-Posting-Host: ix-btr-la1-22.ix.netcom.com X-NETCOM-Date: Fri Feb 16 10:30:55 AM PST 1996 I am trying to determine if a CD-ROM or Floppy Disk exists listing all Vacuum Tubes. It would be preferable if the program had a database of individual tube specifications but a simple listing would be satisfactory. Any help will be appreciated. Frank 'Jamie' Jamison - W5YSM - Email: jami1@ix.netcom.com From lwbyppp@epix.net Sat Feb 17 13:44:44 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.umbc.edu!haven.umd.edu!purdue!lerc.nasa.gov!magnus.acs.ohio-state.edu!math.ohio-state.edu!howland.reston.ans.net!gatech!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!torn!nott!bcarh189.bnr.ca!crchh327.rich.bnr.ca!b4pph13e!cnc23a From: cnc23a@b4pph13e.bnr.ca (Ken Edwards) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: DS-1A (DC-DC converter for Kenwood) question Date: 14 Feb 1996 15:49:07 GMT Organization: Bell-Northern Research, Ottawa, Canada Lines: 29 Distribution: world Message-ID: <4ft09j$ias@crchh327.rich.bnr.ca> NNTP-Posting-Host: b4pph13e.bnr.ca Xref: news.epix.net rec.radio.amateur.homebrew:13341 rec.radio.amateur.misc:98091 I have a Kenwood TS-820S that I would like to run off battery in cases of emergency. And as a (good ?) homebrew project, I thought I could emulate the offering from the manufacturer. Problem is, the information in the back of the service manual is sufficently ambigeous enough that I have a few questions. Is the transformer shown part of the DC-DC converter kit, or is it the one already in the radio, with the barrier strip that already has the matching color coded wires ? The drawing shows the same connector as used for AC input, but wired for DC, then another "power connector" thet does not appear to match the previous which interrconnects with the barrier strip. How exactly is the power (DC) connected into the system ? Any other hints/explainations on this 'project' would be welcomed. Thanks.. -- ====================================================================== Ken M. Edwards, PE Nortel, Research Triangle Park, NC (919) 905-4769 email: cnc23a@bnr.ca All opinions are my own and do not necessarily reflect the views of my employer or co-workers, family, friends, congress, or president. From lwbyppp@epix.net Sat Feb 17 13:44:45 1996 Path: news.epix.net!uunet!in2.uu.net!boulder!spot.Colorado.EDU!tiemann From: tiemann@spot.Colorado.EDU (TIEMANN BRUCE) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Dummy load Date: 14 Feb 1996 03:02:46 GMT Organization: University of Colorado, Boulder Lines: 58 Message-ID: <4frjcm$nhn@peabody.colorado.edu> NNTP-Posting-Host: spot.colorado.edu >From jackl@pinetree.microserve.com Fri Feb 9 17:37:46 MST 1996 tiemann@spot.Colorado.EDU (TIEMANN BRUCE) wrote: >>These dummy loads work well past VHF frequencies and handle 2 watts >>OK, everybody flame me now. N6OTQ >I'll bite... >"VHF frequencies" = very high frequency frequencies >Actually, the first post was correct. The phrase "Very High >Frequency" (abbreviated as "VHF") is an adjective. Despite the fact >that we often treat it as a noun, such use is grammatically incorrect. >"VHF" must be followed by the object it modifies, such as "band", >"frequency", "transmitter", "antenna", etc. Thanks for your correction! I'll be sure to update my dictionaries, which claim "frequency" is only a noun, including the online one (and therefore that "very high frequency" is also, just a particular piece of it): spot> webster frequency fre.quen.cy \-kw*n-se-\ n 1: the fact or condition of occurring frequently 2a: the number of times that a periodic function repeats the same sequence of values during a unit variation of the independent variable 2b: the number of individuals in a single class when objects are classified according to variations in a set of one or more specified attributes 3: the number of repetitions of a periodic process in a unit of time : as 3a: the number of complete alternations per second of an alternating current 3b: the number of sound waves per second produced by a sounding body 3c: the number of complete oscillations per second of an electromagnetic wave and that VHF does _not_ mean "the band between 30 and 300 MHz of the electromagnetic spectrum," as erroneously defined on spectrum allocation charts, but is actually just a modifier. I've got lots of updating to do: Turns out "dog" and "computer" are also adjectives, as in "dog cage" and "computer screen" - just like "VHF radio" and "VHF antenna." Zounds! Turns out _every_ noun is an adjective. "Noun" is an an adjective when used in "noun list"; it just modifies 'list'! But before I do that, I have lots of other things to do. I better check the SWR ratio of my HF frequency antenna, because the ATU tuning unit blew an FET transistor, keeping me from tuning all the way up to the MUF frequency. In which case I'll have to go the the ATM machine (and type in my PIN number) to get some money to buy more IC circuits for the TTL logic part of the CPU unit's LED diode (and CRT tube) display driver, since it's all SNAFU'd up. Too much DC current on the RF frequency (not the VHF frequency) RFI interference blocking choke. Or was it EMI interference, and AC current? I better get out the DMM meter, and follow the trouble-shooters standard SOP operating procedure. I hate it when that happens. Very best 73s's, and CUL later. Bruce N6URH From lwbyppp@epix.net Sat Feb 17 13:44:46 1996 Path: news.epix.net!news.sprintlink.net!shore4.intercom.net!usenet From: "Steven A. Bailey" Newsgroups: rec.radio.amateur.homebrew Subject: Ferric Chloride Question Date: 14 Feb 1996 01:43:12 GMT Organization: Skipjack.net Lines: 7 Message-ID: <4freng$q7c@shore4.intercom.net> NNTP-Posting-Host: modem224.intercom.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) I am wondering the ramifications of dumping some dilluted ferric chloride out in my yard (used for PCB etching). Seems this is a very weak acid...even when at full strength. Any ideas are welcome. Steve From lwbyppp@epix.net Sat Feb 17 13:44:47 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!spool.mu.edu!howland.reston.ans.net!Germany.EU.net!Dortmund.Germany.EU.net!nntp.gmd.de!news.rwth-aachen.de!news.ruhr-uni-bochum.de!news.uni-stuttgart.de!moritz From: moritz@ipers1.e-technik.uni-stuttgart.de () Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ferric Chloride Question Date: 15 Feb 1996 17:05:46 GMT Organization: Comp.Center (RUS), U of Stuttgart, FRG Lines: 12 Message-ID: <4fvp5a$3t84@info4.rus.uni-stuttgart.de> References: <4freng$q7c@shore4.intercom.net> NNTP-Posting-Host: ipers1.e-technik.uni-stuttgart.de >I am wondering the ramifications of dumping some >dilluted ferric chloride out in my yard (used for >PCB etching). Seems this is a very weak acid...even >when at full strength. Any ideas are welcome. There are two catches: Although copper salts are relatively non-toxic for humans, they are highly toxic for bacteria etc. and therefore enviromentally harmfull. Also the ferric chloride is very aggressive, during hydrolysis it releases substantial amounts of hydrochloric acid. You have been warned. 73, Moritz DL5UH From lwbyppp@epix.net Sat Feb 17 13:44:48 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!news2.net99.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news.halcyon.com!usenet From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ferric Chloride Question Date: Thu, 15 Feb 96 10:58:24 PDT Organization: Northwest Nexus Inc. Lines: 32 Message-ID: References: <4freng$q7c@shore4.intercom.net> <4fthmc$g0h@meaddata.lexis-nexis.com> NNTP-Posting-Host: blv-pm1-ip18.halcyon.com Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Newsreader: NEWTNews & Chameleon -- TCP/IP for MS Windows from NetManage > >I am wondering the ramifications of dumping some > >dilluted ferric chloride out in my yard (used for > >PCB etching). Seems this is a very weak acid...even > >when at full strength. Any ideas are welcome. > > > >Steve > > > > I believe that if you dilute it well you may spray it on your yard and it will do a > nice job of greening it up(in warm weather, of course). Ferric cloride is acidic > but not a strongly so as, say hydrogen cloride(muriatic acid), since iron does not > hold on to its outer electrons as well(being large) as hydrogen, and so ionizes much > more easily. Iron plays an important role in the manufacture of clorophyll and this, > of course makes the grass green. > > What about all that dissolved Copper?? I believe that the EPA considers FeCl a hazardous material. 73 de KI7RH p.s. that's how we got rid of it in the old days (before we knew any better). From lwbyppp@epix.net Sat Feb 17 13:44:49 1996 Path: news.epix.net!uunet!in2.uu.net!gatech!newsjunkie.ans.net!newsfeeds.ans.net!lexis-nexis!news From: jkh@meaddata.com (John Heck) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ferric Chloride Question Date: 14 Feb 1996 20:46:04 GMT Organization: Mead Data Central, Dayton OH Lines: 19 Distribution: world Message-ID: <4fthmc$g0h@meaddata.lexis-nexis.com> References: <4freng$q7c@shore4.intercom.net> Reply-To: jkh@meaddata.com NNTP-Posting-Host: beans.lexis-nexis.com In article q7c@shore4.intercom.net, "Steven A. Bailey" w rites: >I am wondering the ramifications of dumping some >dilluted ferric chloride out in my yard (used for >PCB etching). Seems this is a very weak acid...even >when at full strength. Any ideas are welcome. > >Steve > I believe that if you dilute it well you may spray it on your yard and it will do a nice job of greening it up(in warm weather, of course). Ferric cloride is acid ic but not a strongly so as, say hydrogen cloride(muriatic acid), since iron does not hold on to its outer electrons as well(being large) as hydrogen, and so ionize s much more easily. Iron plays an important role in the manufacture of clorophyll and this, of course makes the grass green. From lwbyppp@epix.net Sat Feb 17 13:44:50 1996 Path: news.epix.net!news.sprintlink.net!malgudi.oar.net!multiverse!hookup!news.mathworks.com!news.kei.com!nntp.coast.net!harbinger.cc.monash.edu.au!news.uwa.edu.au!swing.iinet.net.au!opera.iinet.net.au!news From: richardh@iinet.net.au (Richard Hosking) Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew Subject: File formats to download Date: Mon, 12 Feb 1996 23:08:47 GMT Organization: iiNet Technologies Pty Ltd Lines: 20 Message-ID: <4foh5t$u6t@opera.iinet.net.au> Reply-To: richardh@iinet.net.au NNTP-Posting-Host: grunge26.nv.iinet.net.au X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net sci.electronics.design:2840 rec.radio.amateur.homebrew:13325 G,day from Oz I am setiing up a web page with articles on various topics in RF and digital design. Current interests are DDS systems, SSB phasing receivers and the PIC Any ideas re The best document format to download files? Any sites with info on these topics? Richard Hosking VK6BRO VK6BRO 51 Sulman Rd Wembley Downs WA 6019 From lwbyppp@epix.net Sat Feb 17 13:44:51 1996 Path: news.epix.net!news.sprintlink.net!matlock.mindspring.com!news.mindspring.com!gatech!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!usenet From: ritk@aol.com (Rit Keiter) Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew Subject: Re: File formats to download Date: Thu, 15 Feb 1996 02:41:10 GMT Organization: GNN Lines: 54 Message-ID: <31229c3a.4119415@news.gnn.com> References: <4foh5t$u6t@opera.iinet.net.au> NNTP-Posting-Host: www-14-50.gnn.com X-GNN-NewsServer-Posting-Date: 14 Feb 1996 14:41:25 GMT X-Newsreader: Forte Agent .99d/16.182 Xref: news.epix.net sci.electronics.design:2858 rec.radio.amateur.homebrew:13336 richardh@iinet.net.au (Richard Hosking) wrote: >G,day from Oz > >I am setiing up a web page with articles on various topics in RF and >digital design. Current interests are DDS systems, SSB phasing >receivers and the PIC > >Any ideas re > >The best document format to download files? > >Any sites with info on these topics? > >Richard Hosking VK6BRO > >VK6BRO >51 Sulman Rd >Wembley Downs >WA 6019 > >Any sites with info on these topics? Recently, I was so impressed with Adobe's Acrobat PDF (Portable Document File) format, that I bought 300 shares of their stock. I also purchased their $125 Adobe Exchange for win that produces .pdf's from any app that can print to a windows printer. Portable means all platforms; Windows, Macs, Unix. Adobe has a free download of Acroread, which is a subset of the Exchange SW that allows reading and printing *.pdf's. I discovered Acrobat by visiting the Maxim Integrated Products site (search on maxim). They have a link to the free reader download. I downloaded a 10 page Maxim data sheet in 45 seconds at 14.4 K. I was astounded by the quality and detail of the line art and the tiny fonts. It took 4 minutes to print on an old HP laser III without Postscript capability. May be much faster with Postscript printers. I have used Exchange on a 255K WordPerfect document containing several Acad generated line dwgs, to produce a 110K PDF that prints with no perceptible degradation. I see now that Motorola is also using Acrobat PDF, and a CD sampler from Adobe implies that the Dept of Defense is standardizing on PDF and using the Adobe Capture product to archive all DOD legacy paper documents. The CD sampler contains the complete works of Shakespeare, a complete issue of the London Herald, several informative videos and lots more. Adobe sent it to me free and that is where I discovered the $125 special offer for Exchange. My Adobe stock is doing very well. Rit Keiter From lwbyppp@epix.net Sat Feb 17 13:44:52 1996 Path: news.epix.net!news.sprintlink.net!news.mindspring.com!usenet From: wave@mindspring.com (Pieter Ibelings) Newsgroups: rec.radio.swap,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment Subject: FS PTS 160, 100KHz to 160MHz 1Hz resolution DAS synthesizer. Date: 14 Feb 1996 23:22:05 GMT Organization: -.-. --.- -.. -..- Lines: 12 Message-ID: <4ftqqt$fku@firebrick.mindspring.com> NNTP-Posting-Host: wave.mindspring.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Xref: news.epix.net rec.radio.swap:57598 rec.radio.amateur.misc:98105 rec.radio.amateur.homebrew:13350 rec.radio.amateur.equipment:24965 I have a mint PTS160 frequency Synthesizer by Programmed Test Sources. It generates carriers from 100 KHz to 160 MHz in 1 Hz steps. The unit uses Direct Analog Synthesis and can switch frequencies in extremely short times. Power is adjustable from the front panel up to around 15dBm. Unit is calibrate d and within 1Hz of WWV. This unit sells new from PTS for over $7000. Asking $1200. OBO. Unit has TCXO, GPIB, Rack mount and other options. AC4OP Pieter Wave@mindspring.com From lwbyppp@epix.net Sat Feb 17 13:44:53 1996 Path: news.epix.net!news.sprintlink.net!nwnews.wa.com!uw-coco!uw-beaver!nntp.cs.ubc.ca!psgrain!newsfeed.internetmci.com!in2.uu.net!news.ios.com!usenet From: rod@venus.hili.com (Blackshadow) Newsgroups: rec.radio.scanner,alt.radio.scanner,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: FT-8500 Need Mods Date: 13 Feb 1996 03:05:45 GMT Organization: Frequency Spectrum Lines: 8 Message-ID: <4fov69$l98@news.ios.com> NNTP-Posting-Host: 205.147.154.75 Mime-Version: 1.0 Content-Type: Text/Plain; charset=US-ASCII X-Newsreader: WinVN 0.99.7 Xref: news.epix.net rec.radio.scanner:45599 alt.radio.scanner:27506 rec.radio.amateur.misc:98108 rec.radio.amateur.equipment:24966 rec.radio.amateur.homebrew:13353 Someone have the mods for FT-8500? Email: rod@venus.hili.com N2RVM From lwbyppp@epix.net Sat Feb 17 13:44:54 1996 Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!usenet.seri.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!newsxfer2.itd.umich.edu!caen!kuhub.cc.ukans.edu!kuhub.cc.ukans.edu!nntp Newsgroups: rec.radio.amateur.homebrew Subject: GIANT E.F. JOHNSON VARIABLE CAPACITOR FOR SALE Message-ID: <1996Feb15.211516.114128@kuhub.cc.ukans.edu> From: Bill Date: 15 Feb 96 21:15:15 CST Nntp-Posting-Host: kuts9p10.cc.ukans.edu X-Mailer: Mozilla 1.1N (Windows; I; 16bit) MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain Lines: 32 AIR-VARIABLE TRANSMITTING CAPACITOR ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Manufacturer: E.F. Johnson Co. Waseca, Minn. U.S.A. PART NO: 150DD70 CAP uuf * 150 X 2 VOLTS: * 7000 AIR GAP: * .175 SIZE: approx 14 inch X 4.5 inch COMMENTS: * Ratings apply to each section of this multiple section condenser. Includes insulated (steatite) shaft coupling. ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: Would anyone care to make an offer on this beauty? 73s Bill AA4FM/0 From lwbyppp@epix.net Sat Feb 17 13:44:55 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!swidir.switch.ch!in2p3.fr!univ-lyon1.fr!jussieu.fr!rain.fr!world-net!usenet From: opworld@worldnet.fr Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design Subject: Re: Help design coil for coupling 2 amplifiers Date: Fri, 16 Feb 1996 13:21:31 GMT Organization: World-Net information exchange, Internet provider. Lines: 14 Message-ID: <4g20kf$qgq@aldebaran.sct.fr> References: <4fkhdu$4e9@aldebaran.sct.fr> NNTP-Posting-Host: client66.sct.fr X-Newsreader: Forte Free Agent 1.0.82 Xref: news.epix.net rec.radio.amateur.homebrew:13381 sci.electronics.design:2967 Hi everybody Thanks a lot for documented answers. In order I learn something, is there a pratical book a pointer on the net where I can get more informations about Wilkinson splitter ? Regards Have a nice opworld@worldnet.fr Day From lwbyppp@epix.net Sat Feb 17 13:44:56 1996 Path: news.epix.net!uunet!in1.uu.net!news.icanect.net!news.sprintlink.net!sparky.midwest.net!usenet From: bcdlr@midwest.net (Dan Reynolds) Newsgroups: rec.radio.amateur.homebrew Subject: Help with Icom u2sat HT - Batt. packs Date: Wed, 14 Feb 1996 13:08:16 GMT Organization: Midwest Internet Lines: 14 Message-ID: <4fsmdf$gjk@sparky.midwest.net> NNTP-Posting-Host: decatur14.midwest.net X-Newsreader: Forte Free Agent v0.55 Help me! Please! I have an Icom u2sat HT. It uses a battery pack smaller, but similar to the Icom 2sat, HTX202, etc.... The packs themselves are no longer available. Anybody have any ideas of any other packs that might work or connectors, etc. I wouldn't care if I had to put batteries in them. Any ideas on what the regulator circuit would look like? I really like this little HT, I bought it "new" at a hamfest last summer and other than finding batteries for it, it has been a great HT, my first 2 meter rig! TNX, Dan Reynolds, KB9JLO, bcdlr@midwest.net Peace+ Dan Reynolds, bcdlr@midwest.net, KB9JLO From lwbyppp@epix.net Sat Feb 17 13:44:56 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!nntp.coast.net!chi-news.cic.net!news.compuserve.com!newsmaster From: Dietrich Morgenstern <76050.1341@CompuServe.com> Newsgroups: rec.radio.amateur.homebrew Subject: Homebrew GPS RX Date: Thu, 15 Feb 1996 21:54:43 +0100 Organization: NN Lines: 11 Message-ID: <31239D93.7130@CompuServe.com> Reply-To: 76050.1341@CompuServe.com NNTP-Posting-Host: ad41-136.compuserve.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Macintosh; I; 68K) About 2 years ago there was a very detailed description of a homebuilt GPS Rx in the german journal UKW-Berichte. It went over several issues and if I remember correctly there were detailed schematics. The author was a very wellknown Yougoslawian amateur. The article was in the german language. Hope this helps Dietrich DJ1VA NB.: The rx was also suitable for GLONASS. From lwbyppp@epix.net Sat Feb 17 13:44:58 1996 Path: news.epix.net!news.sprintlink.net!news.onramp.net!newshost.convex.com!bcm.tmc.edu!news.msfc.nasa.gov!newsfeed.internetmci.com!in2.uu.net!nwnews.wa.com!news.halcyon.com!usenet From: "Gary P. Fiber" Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: ICOM IC-2SAT HELP!? Date: 14 Feb 1996 04:25:02 GMT Organization: Northwest Nexus Inc. Lines: 33 Message-ID: <4fro6u$gob@news.halcyon.com> References: <4fm7ts$no7$1@mhade.production.compuserve.com> NNTP-Posting-Host: blv-pm12-ip28.halcyon.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.2N (Windows; I; 32bit) Xref: news.epix.net rec.radio.amateur.equipment:24945 rec.radio.amateur.homebrew:13339 uk.radio.amateur:10905 >1) does this radio have a tone burst for reapeter use ,if so how >is it operated? On the 2SAT, 1750 Hz burst could be added if the serial number was below about 9500, also the minimum offset tuning step size needed to be 25 kHz. Here you would need to convert the radio to a european version and install 2 SMD resisotrs. After S/N 9500 or so the offset tuning was made adjustable and the 12.5kHz tuning step was removed, also so was the ability to have a 1750 hz tone burst. The reason was to free enough memory in the CPU to have the adjustable offset tuning steps rather than the original fixed 25 khz tuning in the earlier model 2SAT radios. >2) my radio seems to have rx 100-200 Mhz and tx 140-150Mhz >but the disply will read 0-1300 Mhz. does this mean it can >be made to receive from 0-1300 Mhz if so how? The radio will actually receive from 110 to 136 aircraft A.M. and 136 to 174 Mhz F.M. Signals above or below this range are usually overloads or images. The tuning ability never stopped in the CPU program, how ever the VCO never had the kind of range the frequency readout would report. Gary From lwbyppp@epix.net Sat Feb 17 13:44:59 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet From: Philip Manning Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: ICOM IC-2SAT HELP!? Date: 12 Feb 1996 12:45:44 GMT Organization: University of Surrey, Guildford, England Lines: 11 Message-ID: <4fncpo$kq4@info-server.surrey.ac.uk> References: <4fm7ts$no7$1@mhade.production.compuserve.com> NNTP-Posting-Host: olympus.ee.surrey.ac.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.3 sun4m) To: 100623.303@CompuServe.COM X-URL: news:4fm7ts$no7$1@mhade.production.compuserve.com Xref: news.epix.net rec.radio.amateur.equipment:24972 rec.radio.amateur.homebrew:13357 uk.radio.amateur:10919 To Rob, You had better alter your Compuserve address, otherwise mail will bounce, bring your address CompuServe.COM down to lower case, otherwise you might not get any mail at all, if somebody copies it verbatim. Best to address it Internet:100623.303@compuserve.com Phil G1LKJ Sorry cannot comment on the IC-2SAT. I have a IC2WE though which is very similar. From lwbyppp@epix.net Sat Feb 17 13:45:00 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet From: Philip Manning Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: ICOM IC-2SAT HELP!? Date: 12 Feb 1996 12:47:41 GMT Organization: University of Surrey, Guildford, England Lines: 11 Message-ID: <4fnctd$l2r@info-server.surrey.ac.uk> References: <4fm7ts$no7$1@mhade.production.compuserve.com> NNTP-Posting-Host: olympus.ee.surrey.ac.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.3 sun4m) To: Internet:100623.303@CompuServe.COM X-URL: news:4fm7ts$no7$1@mhade.production.compuserve.com Xref: news.epix.net rec.radio.amateur.equipment:24973 rec.radio.amateur.homebrew:13358 uk.radio.amateur:10920 To Rob, You had better alter your Compuserve address, otherwise mail will bounce, bring your address CompuServe.COM down to lower case, otherwise you might not get any mail at all, if somebody copies it verbatim. Best to address it Internet:100623.303@compuserve.com Phil G1LKJ Sorry cannot comment on the IC-2SAT. I have a IC2WE though which is very similar. From lwbyppp@epix.net Sat Feb 17 13:45:01 1996 Path: news.epix.net!news.sprintlink.net!holonet!colossus.holonet.net!yama.mcc.ac.uk!sunsite.doc.ic.ac.uk!info-server.surrey.ac.uk!usenet From: Philip Manning Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: ICOM IC-2SAT HELP!? Date: 12 Feb 1996 12:47:47 GMT Organization: University of Surrey, Guildford, England Lines: 11 Message-ID: <4fnctj$l2u@info-server.surrey.ac.uk> References: <4fm7ts$no7$1@mhade.production.compuserve.com> NNTP-Posting-Host: olympus.ee.surrey.ac.uk Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (X11; I; SunOS 4.1.3 sun4m) To: Internet:100623.303@CompuServe.COM X-URL: news:4fm7ts$no7$1@mhade.production.compuserve.com Xref: news.epix.net rec.radio.amateur.equipment:24992 rec.radio.amateur.homebrew:13365 uk.radio.amateur:10937 To Rob, You had better alter your Compuserve address, otherwise mail will bounce, bring your address CompuServe.COM down to lower case, otherwise you might not get any mail at all, if somebody copies it verbatim. Best to address it Internet:100623.303@compuserve.com Phil G1LKJ Sorry cannot comment on the IC-2SAT. I have a IC2WE though which is very similar. From lwbyppp@epix.net Sat Feb 17 13:45:02 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!howland.reston.ans.net!torn!nott!crc-news.doc.ca!usenet From: Jim Cummings Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Re: Ignition noise reduction Date: 16 Feb 1996 14:06:12 GMT Organization: Industry Canada Lines: 29 Message-ID: <4g230k$4fc@crc-news.doc.ca> References: <4g0j7q$3nu@news.esslink.com> NNTP-Posting-Host: cummings.jim.dgrr000.ic.gc.ca Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1N (Windows; I; 16bit) To: paulc@esslink.com Xref: news.epix.net sci.electronics.design:2946 rec.radio.amateur.misc:98138 rec.radio.amateur.homebrew:13369 paulc@esslink.com (Paul A. Cianciolo) wrote: >Hello all > >Has anyone ever done any work to quiet down the ignition system (spark >impulse noise) in a gasoline powered vehicle?? I wonder if one could >use large ferrite beads to choke off the spectrum of the spark from >radiating off the wire at the frequencies of interest. 1 mhz and >above? I have done a lot of grounding , and am using resistor plugs >and wires.. Are there any shielded wire kits out there? > >PaulC >"Noisy in Connecticut" > > Hello Paul: I have had good success with passing the ignition cables through some Snap-On Chokes. However, you will have to use a large number of them because, if your vehicle is like my Ford Ranger, there is not enough slack in the ignition cabl es to loop them through (I really wouldn't care to try it anyways). I wish you luck 73 and live better digitally Jim, VE3XJ From lwbyppp@epix.net Sat Feb 17 13:45:06 1996 Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space Path: news.epix.net!news.sprintlink.net!usenet.kornet.nm.kr!xpat.postech.ac.kr!news.kreonet.re.kr!news.dacom.co.kr!newsfeed.internetmci.com!in2.uu.net!mdisea!pilchuck!news From: tomz@premier1.net (Tom Zoch) Subject: Information on equipment sought by new Tech X-Nntp-Posting-Host: inet-gw Message-ID: Sender: news@data-io.com (Usenet news) Reply-To: zoch@data-io.com Organization: Sosiity fer spelen exalanse X-Newsreader: WinVN 0.93.14 Mime-Version: 1.0 Date: Fri, 16 Feb 1996 02:20:34 GMT Lines: 50 Xref: news.epix.net rec.radio.amateur.antenna:19106 rec.radio.amateur.digital.misc:14183 rec.radio.amateur.equipment:24986 rec.radio.amateur.homebrew:13362 rec.radio.amateur.misc:98126 rec.radio.amateur.policy:33110 rec.radio.amateur.space:6337 Hi, I am going to be taking my Tech tests on Saturday (2/17) and am now starting to look in to what type of radios to get. I plan to put a 2M Mobile in my truck and get a more substantial base for home. For home I'm looking into Base Multiband / Multimode Transceivers and trying to decide what will be my best bet. I was thinking of one that would cover at least 2M and perhaps 70cm. I am interested in working into Satellite and EME as well as FM and perhaps some local CW, 12V operation would be a plus but not a major requirement. I do plan on upgrading to at least General with in the next year and expanding also into some HF as well. So I would want to take that into consideration as well. possibly using Transverters get to the higher freqs for satellite and EME and going with a more basic UHF/VHF base unit. For the mobile unit I was thinking of a rather simple 2M unit for repeater and simplex FM. I live in a rather remote area in the western foothills of the Cascades so I think one of the higher output power units would be in order. I was considering picking up one of the new Radio Shack units. As far as I can tell it has most everything I am looking for at a reasonable price. From the cross talk I have seen on the net and the write up in CQ (VHF) it seems to be a good choice. I would like to take advantage of the wealth of experience of those out here on the net and get some input from you as to what you think. Suggestions on equipment to get or avoid as well as things to look for or useless features to not even consider. For me price, value and reliability are important, I have a modest but hopefully adequate amount set aside for starting up and want to use it wisely. The Base unit I'll be looking for used at up coming Ham fests so any information about current or older equipment would be helpful. I was thinking of picking up the Mobil new ( if it is in or around the same price range as the Radio Shack unit ) but am vary open to suggestions. I would also welcome comment on other accessory gear that you feel would be useful as well as thoughts on band selection (pros and cons of the diffrent amature bands ) or what ever info. you would like to pass on to a newbie like myself. I know there are lots of books and other sources around and would not mind pointers to the better source like that, but I am primarily looking for personal insights and experience. Thanks TZ Reply here or by e-mail to tomz@premier1.net From lwbyppp@epix.net Sat Feb 17 13:45:07 1996 Path: news.epix.net!news.sprintlink.net!tank.news.pipex.net!pipex!oleane!nntp.coast.net!news.net99.net!premier1.premier1.net!news From: tomz@premier1.net (Tom) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.swap,alt.radio.amateur.club.clarc,rec.radio.amateur,rec.radio.amateur.digital.misc,rec.radio.amateur.misc,rec.radio.amateur.packet,rec.radio.amateur.policy,rec.radio.amateur.space Subject: Information sought by new Tech Date: 16 Feb 1996 18:13:31 GMT Organization: none of the above Lines: 48 Distribution: world Message-ID: <4g2hgb$f06@premier1.premier1.net> NNTP-Posting-Host: dynamic-39.premier1.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 Xref: news.epix.net rec.radio.amateur.antenna:19125 rec.radio.amateur.equipment:25002 rec.radio.amateur.homebrew:13372 rec.radio.swap:57676 rec.radio.amateur.digital.misc:14200 rec.radio.amateur.misc:98147 rec.radio.amateur.policy:33120 rec.radio.amateur.space:6339 Hi, I am going to be taking my Tech tests on Saturday (2/17) and am now starting to look in to what type of radios to get. I plan to put a 2M Mobile in my truck and get a more substantial base for home. For home I'm looking into Base Multiband / Multimode Transceivers and trying to decide what will be my best bet. I was thinking of one that would cover at least 2M and perhaps 70cm. I am interested in working into Satellite and EME as well as FM and perhaps some local CW, 12V operation would be a plus but not a major requirement. I do plan on upgrading to at least General with in the next year and expanding also into some HF as well. So I would want to take that into consideration as well. possibly using Transverters get to the higher freqs for satellite and EME and going with a more basic UHF/VHF base unit. For the mobile unit I was thinking of a rather simple 2M unit for repeater and simplex FM. I live in a rather remote area in the western foothills of the Cascades so I think one of the higher output power units would be in order. I was considering picking up one of the new Radio Shack units. As far as I can tell it has most everything I am looking for at a reasonable price. >From the cross talk I have seen on the net and the write up in CQ (VHF) it seems to be a good choice. I would like to take advantage of the wealth of experience of those out here on the net and get some input from you as to what you think. Suggestions on equipment to get or avoid as well as things to look for or useless features to not even consider. For me price, value and reliability are important, I have a modest but hopefully adequate amount set aside for starting up and want to use it wisely. The Base unit I'll be looking for used at up coming Ham fests so any information about current or older equipment would be helpful. I was thinking of picking up the Mobil new ( if it is in or around the same price range as the Radio Shack unit ) but am vary open to suggestions. I would also welcome comment on other accessory gear that you feel would be useful as well ( for example band selection for Satellite and EME ), or what ever info you would like to pass on to a newbie like myself. I know there are lots of books and other sources around and would not mind pointers to the better source like that, but I am primarily looking for personal insights and experience . Reply here or by e-mail to tomz@premier1.net Thanks TZ From lwbyppp@epix.net Sat Feb 17 13:45:09 1996 Path: news.epix.net!news.sprintlink.net!worldlinx.com!thunder.mgl.ca!granite.sentex.net!torn!howland.reston.ans.net!newsfeed.internetmci.com!in2.uu.net!felix.teclink.net!usenet From: Thomas Martin Newsgroups: rec.radio.amateur.homebrew Subject: Kenwood 241 Date: 10 Feb 1996 03:37:05 GMT Organization: Martin Enterprises Lines: 14 Message-ID: <4fh3t1$dkt@felix.teclink.net> NNTP-Posting-Host: tc2_46.teclink.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.22 (Windows; I; 32bit) Does anyone know what causes the infamous problem with the 241 display going haywire? It has to be documented somewhere. I know 4 people with the same problem in my area but noone knows how to fix it. If I could find out what the problem is I think I could repair the rig. Thanks for any help. Thomas Martin N5ZNO tmartin@teclink.net From lwbyppp@epix.net Sat Feb 17 13:45:10 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.luc.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news From: tayloe_d@sat.mot.com (Dan Tayloe ) Subject: More NP0 vs. C0G Capacitors Thoughts Reply-To: tayloe_d@sat.mot.com Organization: Motorola Satellite Communications Date: Thu, 15 Feb 1996 15:48:45 GMT Message-ID: <1996Feb15.154845.7199@schbbs.mot.com> References: <4ft9t0$i81@mksrv1.dseg.ti.com> Sender: news@schbbs.mot.com (SCHBBS News Account) Nntp-Posting-Host: 170.1.5.166 Lines: 20 >Since no one else has come forward, I'll offer my two cents worth. NPO >stands for Negative-Positive-Zero. COG is a type of ceramic dielectric, much >as Z5U and X7R are. COG is considered to be an NPO, whereas Z5U and X7R >capacitors vary radically with temperature. I think that some of the negative experiences that I have had with drift and COG capacitors could be due in part to their small size (I have a very difficult time even reading the markings on the tiny little things). The NPOs that I have dealt with are quite large in comparison to the *very* small size of the NPOs. With such a small size, any RF heating of the part will cause a significantly higher temperature rise in a very small part than a much larger one. This *could* have accounted for the effect I was seeing. - Dan Tayloe, WB0NVB, Phoenix, AZ From lwbyppp@epix.net Sat Feb 17 13:45:10 1996 Path: news.epix.net!news.sprintlink.net!sparky.insinc.net!news.bc.net!torn!howland.reston.ans.net!newsfeed.internetmci.com!news.compuserve.com!news.production.compuserve.com!news From: Jay Craswell <73016.27@CompuServe.COM> Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc Subject: Re: Morse code to text display wanted Date: 9 Feb 1996 00:44:49 GMT Organization: Dover Research Corp. Lines: 6 Message-ID: <4fe5e1$ecl$2@mhade.production.compuserve.com> Xref: news.epix.net rec.radio.amateur.homebrew:13321 rec.radio.amateur.equipment:24913 rec.radio.amateur.digital.misc:14127 Hamcom uses a simple 741 interface to an unused comm port and also decodes CW, RTTY, SSTV and AMTOR. I've got some boards that will do this that I will let go for $10 (You build em!) E-Mail me if you are interested. -- 73, Jay WB0VNE - AAV5TH From lwbyppp@epix.net Sat Feb 17 13:45:12 1996 Path: news.epix.net!news.sprintlink.net!news.gdbnet.ad.jp!news.hebel.net!nntp.inet.fi!news.tele.fi!uunet!in2.uu.net!brighton.openmarket.com!decwrl!tribune.usask.ca!duke.usask.ca!buydens From: buydens@duke.usask.ca (Brian Buydens) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc Subject: Re: Morse code to text display wanted Followup-To: rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.digital.misc Date: 12 Feb 1996 15:58:22 GMT Organization: University of Saskatchewan Lines: 30 Message-ID: <4fno2u$t1h@tribune.usask.ca> References: <4du55d$irl@sue.cc.uregina.ca> <4e11t1$1om@cloner2.ix.netcom.com> NNTP-Posting-Host: duke.usask.ca X-Newsreader: TIN [version 1.2 PL2] Xref: news.epix.net rec.radio.amateur.homebrew:13331 rec.radio.amateur.equipment:24937 rec.radio.amateur.digital.misc:14143 I believe the SuperMorse program also has provisions for translating cw to tex t. Brian. Ference Kish (fkish@attila.mtx.net.net) wrote: : > > : > >Hi. My dad is a Ham operator, and asked me if there were some : > inexpensive : > >way to have incoming Morse code automatically translated and displayed : > on : > >a CRT. Since I know nothing about Ham radio, I thought I'd post here. : There is a program called MORSEFFT which you should be able to find on the n et : (use ARCHIE to find the site storing it ) : It needs a sound blaster card as an input device. It comes with C source cod e, : too -- Brian Buydens There was a young poet named Dan, Department of Computing Services Whose poetry never would scan. University of Saskatchewan When told this was so, email: Brian.Buydens@usask.ca He said, "Yes, I know. VE5RDV From lwbyppp@epix.net Sat Feb 17 13:45:14 1996 Path: news.epix.net!news.sprintlink.net!itnews.sc.intel.com!chnews!ornews.intel.com!news.ssd.intel.com!uunet!in2.uu.net!tank.news.pipex.net!pipex!dish.news.pipex.net!pipex!tube.news.pipex.net!pipex!lade.news.pipex.net!pipex!news00.sunet.se!sunic!news.sprintlink.net!ionews.ionet.net!usenet From: martvin@ionet.net (Martin T. Vinson) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Motorola MICOR - Repeater MOD Date: 10 Feb 1996 07:15:14 GMT Organization: Internet Oklahoma Lines: 30 Message-ID: <4fhgm2$6rn@ionews.ionet.net> References: <4et38i$pom@linus.mitre.org> NNTP-Posting-Host: osip119.ionet.net Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 In article <4et38i$pom@linus.mitre.org>, alwong@mitre.org says... > >Does any one have any info on modifying the Motorola MICOR to >be a repeater? I saw this ad in a recent copy of CQ and was >wondering what the specs were and what it entails. > Vhf or UHF ???????????? The VHF is easy, as the TX and RX are two separate strips. Just cut a couple of jumpers, add a couple of jumpers and tada - instant repeater. (Complete with built in desense and the shielding is inadequate) The UHF version is a bit more complicated. The TX oscilator is derived from the RX LO. You have to change the offset xtal and rewind a coil to shift the offset from +5Mhz. to -5Mhz....The rest is easy. Has a lot of problems with RF getting into the PL encoder on the UHF conversions. Don't do them anymore.... The internal shielding really isn't quite good enough to make a real repeater out of it....Additionally, the UHF version is real flaky, the LPA and IPA decks fail often and are real expensive and hard to find. It is easier to build a repeater from a Master II GE but I would still separate the transmitter and receiver into separate units. I have built 15 or 20 of them that way. Martin, KN6UG >-- >Al Wong The above opinion is mine, and does >KF4GDD not reflect that of my employer. As >alwong@mitre.org with all my opinions, I write them, you > interpret them. > > From lwbyppp@epix.net Sat Feb 17 13:45:15 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!howland.reston.ans.net!psinntp!psinntp!psinntp!psinntp!xetron.com!news From: jackg@xetron.com (Jack Giehl) Subject: Need Globar Resistor Info Message-ID: Sender: news@xetron.com Nntp-Posting-Host: jackg.xetron.com Reply-To: Jack Giehl Organization: Xetron Corp. X-Newsreader: WinVN 0.93.02 Mime-Version: 1.0 Date: Wed, 14 Feb 1996 17:49:14 GMT Lines: 7 Hi, I am looking for a supplier or an address/phone number for Globar resistors. Thanks, Jack, WB8BFS From lwbyppp@epix.net Sat Feb 17 13:45:16 1996 Path: news.epix.net!news.sprintlink.net!sundog.tiac.net!news.kei.com!newsfeed.internetmci.com!globe.indirect.com!usenet From: jeffd@coriolis.com (Jeff Duntemann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need ID: Motorola final/ MRF327-8851 Date: Mon, 12 Feb 1996 22:18:18 GMT Organization: The Coriolis Group, Inc. Lines: 35 Message-ID: <4foee7$k5t@globe.indirect.com> References: <4fkc8c$1gq@newsbf02.news.aol.com> NNTP-Posting-Host: 165.247.88.102 X-Newsreader: Forte Free Agent 1.0.82 rickcrider@aol.com (RICKCRIDER) wrote: >Peering inside of an amplifier that I aquired at a military surplus store, >trying to figure out what band it is for and what the power output is. >It takes a 28v DC power supply. Has 'N' type connectors for in and out. >Made by 'TPL Com Inc. >Inside there are five identical circuit boards tied together, with the >heart of each board appearing to be Motorola brand finals. White ceramic >looking discs, about 1/2" in diameter and 1/8" thick. On them is the >Motorola logo and the following: >MRF327 (on the top line) and 8851 directly under the top line. Any >techies out there know what frequencies these may operate at, and at what >power output? >I really have no idea what I have here. It is modern, and brand new. >Just don't know how to figure out what it was made for. Another gentleman described the device itself, and I'll add that the "8851" means the part was manufactured in 1988. The "51" could mean Day 51 or May 1. These codes vary, tho I'll bet the military has a standard, which I don't know. Fersure don't miss Motorola's Web site: http://motserv.indirect.com/ There is a HUGE amount of information there, including a lot of nice downloadable data sheets in Adobe Acrobat format. Good luck with that rig. --73-- --JD-- From lwbyppp@epix.net Sat Feb 17 13:45:17 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!news.slic.com!usenet From: Chris Tabor Newsgroups: rec.radio.amateur.homebrew Subject: Need Info on 2Gig band Date: Wed, 14 Feb 1996 11:40:07 -0500 Organization: Edwards Productions Lines: 10 Message-ID: <31221067.BC3@slic.com> NNTP-Posting-Host: nich_dial12.slic.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0b6a (Win95; I) Hello, I am trying to find a 2 gig amp, or some info. Can anyone help me? -- -C --H ---R ----I -----S ______________________________________________________________________ From lwbyppp@epix.net Sat Feb 17 13:45:18 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: rstapestry@aol.com (RStapestry) Newsgroups: rec.radio.amateur.homebrew Subject: NEED SCHEMATICS FOR GPS RECIEVER Date: 13 Feb 1996 20:51:22 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 3 Sender: root@newsbf02.news.aol.com Message-ID: <4frf6q$fp8@newsbf02.news.aol.com> Reply-To: rstapestry@aol.com (RStapestry) NNTP-Posting-Host: newsbf02.mail.aol.com Please, anyone with the schematics for a GPS reciever. I'm 16 and I really want to make my own GPS unit. If you know of any information like this, please e-mail me. From lwbyppp@epix.net Sat Feb 17 13:45:18 1996 Path: news.epix.net!news.sprintlink.net!news.fast.net!news From: Tony Newsgroups: rec.radio.amateur.homebrew Subject: NEW HAMFEST !!! Date: 16 Feb 1996 23:09:25 GMT Organization: FASTNET(tm) PA/NJ/DE Internet Lines: 7 Message-ID: <4g32r5$rso@nn.fast.net> NNTP-Posting-Host: abe-ppp213.fast.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.1PE (Windows; I; 16bit) THE FIRST NORTHWEST NEW JERSEY HAMFEST will be held on April 28 1996 at the Budd Lake Fire House route 46 Budd Lake, NJ for more info look to "THE HAM-STRING" at http://www.users.fast.net/~n3itn/ From lwbyppp@epix.net Sat Feb 17 13:45:19 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!oleane!plug.news.pipex.net!pipex!tube.news.pipex.net!pipex!dish.news.pipex.net!pipex!tank.news.pipex.net!pipex!howland.reston.ans.net!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!news From: bill.sorsby@dlep1.itg.ti.com (Bill Sorsby) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NP0 vs. C0G Capacitors Date: 14 Feb 1996 18:33:04 GMT Organization: Texas Instruments Lines: 29 Message-ID: <4ft9t0$i81@mksrv1.dseg.ti.com> References: <4f8m9j$ddp@usenet.continental.com> NNTP-Posting-Host: wsorsby.dseg.ti.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 In article <4f8m9j$ddp@usenet.continental.com>, paulc@jax.se.continental.com says... > >I'm seeing conflicting information on the technical specifications (i.e., >temperature coefficient) of NP0 and C0G capacitors. Some sources >indicate they're identical; others show slight percentage differences >between the two. Hi Paul, Since no one else has come forward, I'll offer my two cents worth. NPO stands for Negative-Positive-Zero. COG is a type of ceramic dielectric, much as Z5U and X7R are. COG is considered to be an NPO, whereas Z5U and X7R capacitors vary radically with temperature. I'm not aware of a standard, although there could be one. If your application is critical it may be wise to consult the manufacturer's data sheets for exact specifications on a particular device. Manufacturing processes also affect drift characteristics so similar capacitors from different manufacturers, using the same dielectric material, while close, will display predictably different drift characteristics. Hope this is of some help. Regards, Bill Sorsby, N5BU From lwbyppp@epix.net Sat Feb 17 13:45:20 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!news.neca.com!chi-news.cic.net!news.luc.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!schbbs!news From: tayloe_d@sat.mot.com (Dan Tayloe ) Subject: Re: NPO vs. COG Capacitors Reply-To: tayloe_d@sat.mot.com Organization: Motorola Satellite Communications Date: Thu, 15 Feb 1996 15:39:31 GMT Message-ID: <1996Feb15.153931.6700@schbbs.mot.com> Sender: news@schbbs.mot.com (SCHBBS News Account) Nntp-Posting-Host: 170.1.5.166 Lines: 16 >Since no one else has come forward, I'll offer my two cents worth. NPO >stands for Negative-Positive-Zero. COG is a type of ceramic dielectric, much >as Z5U and X7R are. COG is considered to be an NPO, whereas Z5U and X7R >capacitors vary radically with temperature. Last year I tried using COG capacitors in a VFO design. My local supplier had commented that COG is the same as NPO. In my case, I found that the resulting drift was *much* worse than the assorted NPO capacitors I had been using. Of course, your mileage may vary.... - Dan Tayloe, WB0NVB, Phoenix, AZ From lwbyppp@epix.net Sat Feb 17 13:45:22 1996 Path: news.epix.net!news.sprintlink.net!ratty.wolfe.net!news.aa.net!tsunami.ixa.net!news.ironhorse.com!sloth.swcp.com!tesuque.cs.sandia.gov!ferrari.mst6.lanl.gov!newshost.lanl.gov!ncar!imci4!newsfeed.internetmci.com!howland.reston.ans.net!nntp.coast.net!lll-winken.llnl.gov!venus.sun.com!news2me.EBay.Sun.COM!newsworthy.West.Sun.COM!news70.West.Sun.COM!myers From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 12 Feb 1996 08:29:22 GMT Organization: SunSoft South, Los Angeles, CA Lines: 43 Message-ID: <4fmtp2$ion@abyss.West.Sun.COM> References: <4fiqeh$189@hpcvsnz.cv.hp.com> NNTP-Posting-Host: sunspot.west.sun.com In article <4fiqeh$189@hpcvsnz.cv.hp.com>, Tom Bruhns wrote : >David A Willmore (willmore@whelk.cig.mot.com) wrote: >: It seems that every time I look for information on PLL loop filter design, >: they focus on simple implementation of the loop filter. Is it because >: simple one or two pole filters are the ideal filters for this use or >: is there some other design constraint involved? The filter only has to >: work in the audio range--from my understanding. Would a brick wall, low >: pass filter of a high order be a better solution? What if you could widen >: the passband while tuning and narrow it down once you have aquired lock? > >The problem is that the filter is part of a closed-loop feedback control >system. If you have unity gain and net 360 degrees phase shift in the >loop, you are going to have oscillations. Since high-order filters have >large phase shifts where their gain is still high, they aren't appropriate >for use in a closed loop. What is important to look at is the loop Bode plot; it is easy to design a filter to one particular parameter (minimum reference feedthrough OR fast lock-up time OR ..., etc.) but the real task is to balance between several conflicting design goals, one of which is loop stability. A Bode plot of the loop response is important (and not difficult to do) to make sure the loop is stable. At the same time, be sure to take into account the changing loop parameters (mostly VCO gain) over the operational range; you'll need to calculate loop stability at both extremes of VCO gain to make sure it doesn't break into oscillaton (don't forget to include overshootas part of the VCO extreme). Don't forget that noise in the loop filter directly translates to noise in the VCO output, and more complicated filters tend to be noisier, which can ruin otherwise good phase noise performance. Of course, the filter is there to stabilize the loop and minimize undesired reference frequency modulation of the VCO, so you might do as suggested in one Motorola app note and design the "right" loop filter and then follow this with a notch filter at the reference frequency in order to gain a way to independently achieve both goals. Also, don't forget I'm a computer programmer and not a PLL designer ;-) -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Sat Feb 17 13:45:23 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!vixen.cso.uiuc.edu!howland.reston.ans.net!nntp.crl.com!newshub.cts.com!not-for-mail From: jlkolb@sd.cts.com (John Kolb) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 13 Feb 1996 21:19:30 GMT Organization: CTS Network Services (CTSNET), San Diego, CA Lines: 30 Message-ID: <4fqv92$9nr@news3.cts.com> References: NNTP-Posting-Host: sd-i2.cts.com X-Newsreader: TIN [version 1.2 PL2] David A Willmore (willmore@whelk.cig.mot.com) wrote: : It seems that every time I look for information on PLL loop filter design, : they focus on simple implementation of the loop filter. Is it because : simple one or two pole filters are the ideal filters for this use or : is there some other design constraint involved? The filter only has to : work in the audio range--from my understanding. Would a brick wall, low : pass filter of a high order be a better solution? What if you could widen : the passband while tuning and narrow it down once you have aquired lock? Just offhand, I would say the varying phase shifts as you moved across a complex filter would be very unsetting to loop dynamics. Looking at someone's synthesizer IC the other day (National?) that brings out a pin called QuickLock which can be used to throw a shunting resistor in a simple lead/lag network to speed up the lock time. : Just a few thoughts and questions. BTW, anyone have a good VCO design for : 60.7 to 64.7 MHz? :) Years ago now, I had very good luck using a capacitor at the end of an ~ 1/4 wavelength of coax to replace the inductor in a VCO, to get higher Q and thus lower phase noise. Use minature coax, and just roll it up out of the way. John Kolb KK6IL jlkolb@cts.com From lwbyppp@epix.net Sat Feb 17 13:45:24 1996 Path: news.epix.net!uunet!in2.uu.net!news.cais.net!primus.ac.net!imci4!newsfeed.internetmci.com!news.kei.com!nntp.coast.net!swidir.switch.ch!swsbe6.switch.ch!surfnet.nl!news.nic.surfnet.nl!tuegate.tue.nl!news.IAEhv.nl!news From: Rik Slingerland Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 13 Feb 1996 21:30:40 GMT Organization: Internet Access Eindhoven, the Netherlands Lines: 12 Message-ID: <4fqvu0$2f2@iaehv.IAEhv.nl> References: <4fln1c$mo3@delta.misha.net> NNTP-Posting-Host: pm1d05.iaehv.nl It's a long time ago I did something with them, but I seem to remember that if the phase shift at unity gain OF THE LOOP was more than 90 degrees, oscillation occurs. Therefore higher order filters are used, but at the unity gain 'frequency' they must be stopped to 1st order. A good book on this might be: Frequency Synthesizers, Vadim Manassewitch, John Wiley & Sons PE1BIZ From lwbyppp@epix.net Sat Feb 17 13:45:25 1996 Path: news.epix.net!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.luc.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!newdelph.cig.mot.com!whelk!willmore From: willmore@whelk.cig.mot.com (David A Willmore) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 14 Feb 96 20:34:30 GMT Organization: Motorola Cellular Infrastructure Group Lines: 43 Message-ID: References: <4fqv92$9nr@news3.cts.com> NNTP-Posting-Host: whelk.cig.mot.com jlkolb@sd.cts.com (John Kolb) writes: >David A Willmore (willmore@whelk.cig.mot.com) wrote: >: It seems that every time I look for information on PLL loop filter design, >: they focus on simple implementation of the loop filter. Is it because >: simple one or two pole filters are the ideal filters for this use or >: is there some other design constraint involved? The filter only has to >: work in the audio range--from my understanding. Would a brick wall, low >: pass filter of a high order be a better solution? What if you could widen >: the passband while tuning and narrow it down once you have aquired lock? >Just offhand, I would say the varying phase shifts as you moved >across a complex filter would be very unsetting to loop dynamics. Supposedly, the filters come in an eliptic variety which, I would think, would not suffer from this much. >Looking at someone's synthesizer IC the other day (National?) that >brings out a pin called QuickLock which can be used to throw a >shunting resistor in a simple lead/lag network to speed up the >lock time. Hmmm, I'll have to give them a look. This design is for personal use, BTW. I don't do these things for a career. :) >: Just a few thoughts and questions. BTW, anyone have a good VCO design for >: 60.7 to 64.7 MHz? :) >Years ago now, I had very good luck using a capacitor at the end >of an ~ 1/4 wavelength of coax to replace the inductor in a VCO, >to get higher Q and thus lower phase noise. Use minature coax, and >just roll it up out of the way. Hmmm, this would be even more practical as I'm thinking of going to a mutiplied VCO which would get divided down to make the LO. >John Kolb KK6IL jlkolb@cts.com Thanks for the ideas. Cheers, David From lwbyppp@epix.net Sat Feb 17 13:45:26 1996 Path: news.epix.net!uunet!in2.uu.net!news.sprintlink.net!malgudi.oar.net!imci4!imci5!pull-feed.internetmci.com!news.internetMCI.com!newsfeed.internetmci.com!howland.reston.ans.net!math.ohio-state.edu!newsfeed.acns.nwu.edu!ftpbox!mothost!newdelph.cig.mot.com!whelk!willmore From: willmore@whelk.cig.mot.com (David A Willmore) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 14 Feb 96 20:26:13 GMT Organization: Motorola Cellular Infrastructure Group Lines: 21 Message-ID: References: <4fj5uf$s9o@alterdial.UU.NET> NNTP-Posting-Host: whelk.cig.mot.com David Nulton writes: >I'm not a PLL expert but have worked with some simple stuff at >1Khz. I believe the design of the filter will affect the capture >and lock range of the PLL. For example, too sharp a filter could >easily lose lock (If I understand it right). However I think the >gear shifting filter idea might work just dandy. Although >depending on your application, there usually isn't much need for a >really whopper filter in the PLL. >Just my thoughts >73s >de KI5XW Thanks. My two concerns with this design are fast lock times with variable step sizes and low phase noise once lock has been acheived. Cheers, David From lwbyppp@epix.net Sat Feb 17 13:45:27 1996 Path: news.epix.net!news.sprintlink.net!news.intelenet.com!unogate!mvb.saic.com!homer.alpha.net!daily-planet.execpc.com!news.sol.net!news.inc.net!news.uoregon.edu!waikato!comp.vuw.ac.nz!central.co.nz!usenet From: barryl@central.co.nz@central.co.nz (Barry Lennox) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Poor Man's Packet Date: 12 Feb 1996 09:34:39 GMT Organization: Personal Lines: 15 Message-ID: <4fn1jf$qb4@central.co.nz> References: <4f971p$msa@aphex.direct.ca> NNTP-Posting-Host: barryl.central.co.nz X-Newsreader: WinVN 0.93.14 In article <4f971p$msa@aphex.direct.ca>, ccouplan@direct.ca says... > >Looking for a project article titled "Poor Man's Packet" found in the >August 1991 (pg. 8) of `73: Amateur Radio Today'. >Any help in locating this would be greatly appreciated. I have the article. I ordered the software from the author, built the PMP system from the junkbox (purchased the IC) and it works fine. You should be able to get the original copy of 73 from a good library. E-Mail me if you get really stuck. Barry Lennox From lwbyppp@epix.net Sat Feb 17 13:45:28 1996 Newsgroups: rec.radio.amateur.homebrew Path: news.epix.net!news.sprintlink.net!newsserver.pixel.kodak.com!bofh.mi.org!frankensun.altair.com!nntp.coast.net!torn!nott!cunews!freenet.carleton.ca!FreeNet.Carleton.CA!ae517 From: ae517@FreeNet.Carleton.CA (Russ Renaud) Subject: PostScript to Gerber Message-ID: Sender: ae517@freenet3.carleton.ca (Russ Renaud) Reply-To: ae517@FreeNet.Carleton.CA (Russ Renaud) Organization: The National Capital FreeNet Date: Wed, 14 Feb 1996 20:48:30 GMT Lines: 7 Is there any shareware utility that will convert a ppostscript file to Gerber format (for cad/cam), or a shareware cad app that will read a postscript and output in Gerber? thanks From lwbyppp@epix.net Sat Feb 17 13:45:29 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!guitar.sound.net!imci3!imci5!imci4!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: itutec@aol.com (ITUTec) Newsgroups: rec.radio.amateur.homebrew Subject: Press Release - PIC-1 Pro Pack Date: 12 Feb 1996 00:29:48 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 42 Sender: root@newsbf02.news.aol.com Message-ID: <4fmj8c$pbp@newsbf02.news.aol.com> Reply-To: itutec@aol.com (ITUTec) NNTP-Posting-Host: newsbf02.mail.aol.com ITU Technologies is proud to introduce the new PIC-1 Pro Pack. This new package is geared toward serious hobbyists and engineers looking for a high-quality PIC programmer at a low price. The PIC-1 Pro Pack includes: * the PIC-1 Programmer w/software, cables and power supply (US only) * the PIC-n-GO upgrade (PIC16C84 processor and data sheet) * 18-pin ZIF socket upgrade for PIC-1 * 40/28 pin ZIF adapter module for PIC-1 The PIC-1 Pro Pack is _only_ $79US in kit form or $99US assembled/tested. This package will allow you to program all of Microchip's PICs in the mid-range family (PIC16C6x/7x/8x) with out-of-the-box support! This high-quality package includes everything you will need to begin programming PIC microcontrollers today! This is the same PIC-1 programmer you have read about in Electronic Products, MicroComputer Journal, Electronics Now, Popular Electronics and Nuts and Volts Magazine. For those just starting out with PICs, we recommend our PIC-n-GO Package. This includes our PIC-1 programmer with one PIC16C84 EEPROM-based processor and data sheet. This package includes all software, cables and power supply (US only) for only $45US in kit form or $61US assembled/ tested. The PIC-1 programmer alone is available for $39US in kit form or $55 assembled/tested. Please add $5 shipping in North America, $10 to all other destinations. You may pay with VISA or MasterCard, COD (US only), money order, or your personal check. See our WEB PAGE for more details and other great products! WEB URL: http://www.itutech.com ITU TECHNOLOGIES E-mail: sales@itutech.com Phone : (513) 574-7523 9AM - 5PM Eastern Fax : (513) 574-4245 From lwbyppp@epix.net Sat Feb 17 13:45:30 1996 Path: news.epix.net!news.sprintlink.net!news.icon.net!imci2!pull-feed.internetmci.com!imci5!imci4!newsfeed.internetmci.com!swrinde!cs.utexas.edu!news.ti.com!news.dseg.ti.com!news From: QRP%mimi@magic.itg.ti.com (D W Hemphill KC5NG) Newsgroups: rec.radio.amateur.homebrew Subject: Re: QRP Schematics scanned and ready! Date: 16 Feb 1996 13:28:00 GMT Lines: 6 Message-ID: <4g20p0$1gd@mksrv1.dseg.ti.com> References: <4f0sru$as8@news-f.iadfw.net> NNTP-Posting-Host: dhemphill.dseg.ti.com Mime-Version: 1.0 Content-Type: Text/Plain; charset=ISO-8859-1 X-Newsreader: WinVN 0.99.5 I'd love to see the QRP schematics. Do you have parts lists, coil winding info, etc? I am a QRP animal, and I enjoy building and operating homebuilt equipment. 73 / 72 de KC5NG / QRP-ARCI #8204 From lwbyppp@epix.net Sat Feb 17 13:45:31 1996 Path: news.epix.net!news.sprintlink.net!rain.fr!jussieu.fr!math.ohio-state.edu!uwm.edu!newsfeed.internetmci.com!howland.reston.ans.net!quagga.ru.ac.za!uct.ac.za!iafrica.com!aztec.co.za!workspc From: workshop@pcm.co.za (Workshop) Newsgroups: rec.radio.amateur.homebrew Subject: Shunt peaking coils Date: 15 Feb 1996 12:18:12 GMT Organization: Professional Computer Manufacturers Lines: 11 Message-ID: <4g012e$1l0_002@pcm.co.za> NNTP-Posting-Host: workspc.pcm.co.za X-Newsreader: News Xpress Version 1.0 Beta #3 Is there anyone out there who can give me design formulas/rules for calculating the value of shunt peaking coils. I have a design for an aerial amp,but the coil winding instructions have been left out.The only info it has is that the coil is 2.5 turns.No wire gauge,diameter or length!(FAT HELP) The design comes from the TV DXers handbook published around 1988. Maybe someone out there has come across or built the circuit and could help out. Thanks Cheers Robin From lwbyppp@epix.net Sat Feb 17 13:45:32 1996 Path: news.epix.net!news.sprintlink.net!bison.alfred.edu!kato.theramp.net!chi-news.cic.net!newsxfer2.itd.umich.edu!agate!spool.mu.edu!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: software for mfj-1278 tnc Date: 11 Feb 96 04:40:39 GMT Organization: ucsd usenet gateway Lines: 7 Message-ID: <199602110449.OAA05293@dyson.brisnet.org.au> NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu Hello all, I amlooking for some software to use all the functions of the mfj 1278 multimode tnc. I am sure I saw somewhere a program described that does all the functions (but much better ) than multicom 3.1. Unfortunately I did not bookmark the site or program name, can you help????. regards Peter L. Williamson VK4AWP. From lwbyppp@epix.net Sat Feb 17 13:45:33 1996 Path: news.epix.net!news.sprintlink.net!news.dpc.net!novia!nntp.inc.net!news.sol.net!news.inc.net!uwm.edu!math.ohio-state.edu!magnus.acs.ohio-state.edu!usenet.ins.cwru.edu!po.CWRU.Edu!dxk10 From: dxk10@po.CWRU.Edu (David Kazdan Md) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Stereo xmitter chip? Date: 9 Feb 1996 23:39:22 GMT Organization: Case Western Reserve University, Cleveland, OH (USA) Lines: 40 Message-ID: <4fglva$8cv@madeline.INS.CWRU.Edu> References: <4emtge$t1g@bcfreenet.seflin.lib.fl.us> Reply-To: dxk10@po.CWRU.Edu (David Kazdan Md) NNTP-Posting-Host: christopher.ins.cwru.edu In a previous article, mzenier@netcom.com (Mark Zenier) says: >in <4emtge$t1g@bcfreenet.seflin.lib.fl.us>, Eliot Fenton wrote: >: But does anyone know of a chip manufactured by Motorola, National, etc. >: that will take left and right stereo audio outputs (from say a C.D. >: player) and produce an RF carrier suitable for reception and demod. on any >: stereo receiver? > >A Japanese company has a single chip stereo transmitter, the Rohm Ba1404. > > >Unless you want to deal with a fairly quirky chip, you can get a >preassembled stereo to RF converter at your local discount store for >about $20 in the form of the FX Wave Fx-100. Hanging on the pegboard in >the audio department. (I use one hooked to my VCR for wireless >headphones.) It's just LC tuned, but seems stable enough. The main >chip has the label sanded off. It doesn't have enough pins to be a >BA1404, but I suspect it is a related chip. I hear Rohm makes a stero >multiplexer chip without the transmitter section. The FX wave has a >seperate 4 transistor RF section. Mine is labelled differently, from a Canadian manufacturer. It is cheap and works well. The Ramsey FM25 is expensive and in kit form, but works _very_ well. The 1404 has a varactor in parallel with the tank capacitor, and the Ramsey kit uses that as the VCO in a PLL; it DIP-switch sets to a standard FM frequency and does indeed stay there. Any ham uses for these things? I don't know if multiplex transmitting is legal on the ham bands. --David -- David Kazdan, M.D., Ph.D dxk10@po.cwru.edu; Amateur Radio: AD8Y Anesthesiologist, Whitacre Department of Anesthesiology, Meridia Huron Hospital, East Cleveland, Ohio From lwbyppp@epix.net Sat Feb 17 13:45:34 1996 Path: news.epix.net!uunet!in1.uu.net!spool.mu.edu!munnari.OZ.AU!ihnp4.ucsd.edu!news1.ucsd.edu!news-mail-gateway From: vk2esl@vk2djg.une.EDU.AU (Steve Lisle) Newsgroups: rec.radio.amateur.homebrew Subject: test msg Date: 14 Feb 96 15:41:42 GMT Organization: ucsd usenet gateway Lines: 1 Message-ID: <5832@vk2esl.ampr.org> Reply-To: vk2esl@vk2djg.une.edu.au NNTP-Posting-Host: ucsd.edu Originator: daemon@ucsd.edu just seeing if this gets to the digest ok. From lwbyppp@epix.net Sat Feb 17 13:45:35 1996 Path: news.epix.net!uunet!in2.uu.net!spstimes.sps.mot.com!newsdist.sps.mot.com!newsgate.sps.mot.com!usenet From: Jim Strohm Newsgroups: rec.radio.amateur.homebrew Subject: Re: Use for ferite materials??? Date: 13 Feb 1996 18:28:25 GMT Organization: Semiconductor Products Sector Lines: 16 Message-ID: <4fql89$11as@newsgate.sps.mot.com> References: <311F3E9A.34C5@ix.netcom.com> NNTP-Posting-Host: 222.229.249.54 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 1.12(Macintosh; I; PPC) X-URL: news:311F3E9A.34C5@ix.netcom.com A pair of the ferrite cones can be used as a filter for your phone line -- take a half a dozen turns through the core. If you had hundreds of these cores, you might find a sculptor who is working with "found" art who could use them. That's all I've found you could do with yoke cores. We already know that flyback transformer cores can be used in some toroid applications such as filament chokes. N6OTQ The line for flames forms over there. Take a number- 196. Now serving number 3. From lwbyppp@epix.net Sat Feb 17 13:45:36 1996 Path: news.epix.net!news.sprintlink.net!interactive.net!winternet.com!fury.berkshire.net!news.ironhorse.com!sloth.swcp.com!ns2.mainstreet.net!bug.rahul.net!a2i!genmagic!sgigate.sgi.com!swrinde!howland.reston.ans.net!ix.netcom.com!netnews From: Steven B Reed Newsgroups: rec.radio.amateur.homebrew Subject: Use for ferite materials??? Date: Mon, 12 Feb 1996 08:20:26 -0500 Organization: Netcom Lines: 14 Message-ID: <311F3E9A.34C5@ix.netcom.com> NNTP-Posting-Host: ix-day-oh1-08.ix.netcom.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-NETCOM-Date: Mon Feb 12 5:22:45 AM PST 1996 X-Mailer: Mozilla 2.0b6a (Win95; I) Hello all, I work at a large CRT manufacturer, and they throw away a large quanity of defection yokes. I have saved a few from the landfill, (mostly for the enameled copper wire), and have discovered what appears to be a large cone of ferite looking material. I know that this "stuff" can be used to make chokes and the like. My question is, can these half cone shapes be used for anything usefull? Now that I have them home I would rather do something with them besides just pitching them in MY trash. Any and all help is appreciated 73 -- Steven Reed KB8STB From lwbyppp@epix.net Sat Feb 17 13:45:36 1996 Path: news.epix.net!news.sprintlink.net!europa.chnt.gtegsc.com!usenet.eel.ufl.edu!spool.mu.edu!noc.nyx.net!nyx.cs.du.edu!not-for-mail From: tmahanna@nyx.cs.du.edu (Thomas Mahanna) Newsgroups: rec.radio.amateur.homebrew Subject: Voice Command Chip?? Date: 15 Feb 1996 23:48:38 -0700 Organization: Nyx.net, free public access to the Internet Lines: 39 Message-ID: <4g19c6$3fd@nyx.cs.du.edu> NNTP-Posting-Host: nyx.nyx.net X-Newsreader: TIN [version 1.2 PL2] Hi: Does anyone remember a VCP-200 or whatever chip that used to be sold a Radio Crap?? It allowed you to give voice commands like: 1. Stop 2. Left 3. Right etc... It was speaker independent and cost about $20. Are these available anywhere else? Is there a cheaper/better alternative? THANKS! -Tom please reply to : lee02016@acad.suffolk.edu  From lwbyppp@epix.net Sat Feb 17 13:45:37 1996 Path: news.epix.net!news.sprintlink.net!itnews.sc.intel.com!news.sprintlink.net!newsfeed.internetmci.com!chi-news.cic.net!news.midplains.net!gw2.att.com!pacbell.com!amdahl.com!amd!netcomsv!uu4news.netcom.com!netcomsv!uu3news.netcom.com!ix.netcom.com!netnews From: timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI ) Newsgroups: rec.radio.amateur.homebrew Subject: W1FB's univ. dc rx Date: 11 Feb 1996 15:12:32 GMT Organization: Netcom Lines: 13 Message-ID: <4fl110$1kn@cloner3.netcom.com> References: <4f971p$msa@aphex.direct.ca> NNTP-Posting-Host: ix-pon-mi3-11.ix.netcom.com X-NETCOM-Date: Sun Feb 11 7:12:32 AM PST 1996 Has anyone build the W1FB Universal RX from the W1FB QRP Notebook? I am halfway through putting parts on the board and noticed that there is no value for C3. ( Schem is on page 78) C3 appears to just couple the signal but I dont know if its part of the tuned input or not. And not well enough versed to know what a good value would be. Any comments or success storys related to this schematic are appreciated. Tim, ka8ddz From lwbyppp@epix.net Sat Feb 17 13:45:39 1996 Path: news.epix.net!uunet!in1.uu.net!newsfeed.internetmci.com!psgrain!nntp.teleport.com!ip-pdx03-06 From: w7el@teleport.com (Roy Lewallen) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Wanted Schematics for TEKTRONIX 2215A SCOPE Date: Wed, 14 Feb 96 09:53:50 GMT Organization: EZNEC Antenna Software Lines: 19 Message-ID: <4fsbdt$3pt@maureen.teleport.com> References: <199602120708.RAA19116@dyson.brisnet.org.au> NNTP-Posting-Host: ip-pdx03-06.teleport.com X-Newsreader: News Xpress Version 1.0 Beta #3 In article <199602120708.RAA19116@dyson.brisnet.org.au>, peterw@dyson.BRisnet.ORG.AU (Peter L. Williamson) wrote: >Can any reader help me with some schematics/scope trace for the TEK 2215A. >Mine has just developed a fault where it will not trigger on CH. 2 and I am >keen to repair it (AGAIN! SIGH! I think I could take this one apart in my >sleep----) >Tnx Peter VK4AWP. Manuals for most older Tektronix scopes can be obtained from Deane Kidd, W7TYR 2727 SW Ladd Hill Road Sherwood, OR 29140 USA (+1) 503-625-7363 You might still be able to get a manual for the 2215A from Tektronix. Roy Lewallen, W7EL From lwbyppp@epix.net Sat Feb 17 13:45:40 1996 Path: news.epix.net!news.sprintlink.net!braintree!news.concourse.com!ragnarok.oar.net!malgudi.oar.net!imci4!newsfeed.internetmci.com!solaris.cc.vt.edu!usenet From: Mars@dum.edu Newsgroups: rec.radio.amateur.homebrew Subject: WTB 6,000 watt linear amp 75 meters Date: 16 Feb 1996 18:53:10 GMT Organization: Virginia Tech, Blacksburg, Virginia Lines: 2 Message-ID: <4g2jqm$huc@solaris.cc.vt.edu> NNTP-Posting-Host: jimo.mine.vt.edu Mime-Version: 1.0 X-Newsreader: WinVN 0.93.14 Please forward info. From lwbyppp@epix.net Sat Feb 17 13:45:42 1996 Path: news.epix.net!uunet!in2.uu.net!newsfeed.internetmci.com!howland.reston.ans.net!news-e1a.megaweb.com!newstf01.news.aol.com!newsbf02.news.aol.com!not-for-mail From: jrosariojr@aol.com (JRosariojr) Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap Subject: Re: WTB:5KW AM Transmitter Date: 14 Feb 1996 03:49:49 -0500 Organization: America Online, Inc. (1-800-827-6364) Lines: 1 Sender: root@newsbf02.news.aol.com Message-ID: <4fs7nd$por@newsbf02.news.aol.com> References: <4fn47d$j76@www.acay.com.au> Reply-To: jrosariojr@aol.com (JRosariojr) NNTP-Posting-Host: newsbf02.mail.aol.com Xref: news.epix.net aus.radio.amateur.misc:446 aus.radio.amateur.wicen:71 rec.radio.amateur.antenna:19099 rec.radio.amateur.digital.misc:14179 rec.radio.amateur.equipment:24980 rec.radio.amateur.homebrew:13359 rec.radio.amateur.misc:98120 rec.radio.scanner:45613 rec.radio.swap:57615 good luck From lwbyppp@epix.net Wed Feb 21 16:05:48 1996 Subject: ### KISS on a Baycom? Newsgroups: rec.radio.amateur.homebrew From: edwint@greenie.com (Edwin Teh) Date: Mon, 19 Feb 1996 18:37:47 Message-ID: <312852fb.1d2@greenie.com> Hello people, I've recently taken an interest in working tcp/ip over packet, and it seems a little difficult to do that with my homebrewed baycom-style packet modem. Anyway, I've been considered porting over to a varient of unix, and it seems I would need a TNC which supports KISS (that'd mean my baycom would have to be scrapped). Since cost is a rather high consideration for me, I'd like to know if it's possible to homebrew a KISS interface for a baycom-style packet modem? The idea doesn't seem impossible, could someone point me in the right direction to work on such a project? 73 de 9V1ZY -- EdwinT@greenie.com -[ Standard Disclaimers Apply ]- Now Faith is a substance of things hoped for, the evidence of things not seen. [Heb 11:1] As Email can be altered electronically, the integrity of this communication is not guaranteed. ÿ From lwbyppp@epix.net Wed Feb 21 16:05:49 1996 Subject: Re: ### KISS on a Baycom? Newsgroups: rec.radio.amateur.homebrew From: edwint@greenie.com (Edwin Teh) Date: Wed, 21 Feb 1996 09:07:26 References: <312852fb.1d2@greenie.com> Message-ID: <312a704e.181@greenie.com> In article , Helmut Strickner writes: > There are a number of KISS drivers around for the Baycom - style modem. > TFPCX > TFX > probably some more that I dont recall off the top of my head. > For NOS use AX25.COM from Pawel Jalocha. Thanks for your helpful infomation - but I'm to understand baycom style modems don't work on unix(and it's varients) based systems due to the way they operate. I haven't seen any KISS drivers for the Baycom for unix. 73 de 9V1ZY -- EdwinT@greenie.com -[ Standard Disclaimers Apply ]- Now Faith is a substance of things hoped for, the evidence of things not seen. [Heb 11:1] As Email can be altered electronically, the integrity of this communication is not guaranteed. ÿ From lwbyppp@epix.net Wed Feb 21 16:05:51 1996 From: ed@fore.com (Ed Bathgate) Newsgroups: rec.radio.amateur.homebrew Subject: 'Memory keyer - Public domain code' Date: 15 Feb 1996 11:56:27 -0500 Message-ID: <4fvojr$1fp@baleen.fore.com> Does anybody know of a microcontroller based keyer with public domain software? I have FTP'd, and searched, and archied, and webbed, and havent found one yet. Perhaps it doesent exist. I recall a while back there were a lot of posts complaining about a cpu Super Keyer construction article published recently in QST, not having source code. From what I understand, the only way to build this keyer was with his preprogrammed $50 chip. Well... I pose an idea... Pool a list of desired features, get a group of geeks together via internet, and group write and post the source code, and design and build a public domain keyer... and then make a group article for QST. Sound plausable, or am I asking for a democracy in the land of chaos? Perhaps we could have code for several types of Microcontrollers. My personal MPU of choice is the motorola 68hc11, why is that you ask? Low cost - under $20 bucks each. (I already have some) EEPROM 512 bytes, ram 256 bytes, on board serial and parallel and A>D ports. It can be programmed via its own serial port WITHOUT A SPECIAL PROGRAMMER! The motorola compiler software is available via bbs and internet to run on a P C. I like many others learned 6800 on a heathkit trainer 10+ years ago and am quite comfortable with its instruction set. The design could be easily be ported to 6800, 68x711,811 or whatever. Perhaps there is some guru who could port the final design over to RISC for PI C. Features/functions... Iambic operation, single or dual paddle. Single striaght key operation. (How? input requested) Adjustable weight, speed and spacing. (Pots to analog input channels? input requested) Multiple memorys - push button selection. (several discrete buttons, or up/down buttons and status leds? input request ed) TX relay control for older tube type rigs that shorten first character while the tx/rx relay closes. Prevents relay from opening until EOM or SK is sent . Perhaps an SK button? Now is your chance to have some input into a new keyer design, one that you can really build and program yourself! Send your thoughts to Ed@fore.com 73 Ed N3SDO From lwbyppp@epix.net Wed Feb 21 16:05:52 1996 From: Gary Davidson Newsgroups: rec.radio.amateur.homebrew Subject: Re: (no subject) Date: 14 Feb 1996 23:58:09 GMT Message-ID: <4ftsuh$smp@miwok.nbn.com> References: <4ft621$vj@miwok.nbn.com> NEVER MIND, I was able to locate exact replacement diodes, all is well! -- Gary... KJ6Q... I am the NRA | "Only in AMERICA, Veterans in shacks, ============================ | a DRAFT DODGER in the White House... "Did you come here to *LEARN*,|====================================== or to look around, make rude | "It's *EASY* to be a liberal, it's noises & provide proof our | OTHER people's money you are giving educational system stinks?" | away! (or living off of!) From lwbyppp@epix.net Wed Feb 21 16:05:54 1996 Distribution: world Newsgroups: rec.radio.amateur.homebrew From: brian.carling@acenet.com (Brian Carling) References: <1996Feb13.172422@atl.com> Date: Fri, 16 Feb 1996 16:55:00 -0500 Subject: Re: 813 Xmtr for 160M Message-ID: <2a6.8518.546@acenet.com> From: brian.carling@acenet.com "mail sometimes bounces here, please resend if needed!" I once had an ART-13 - got it free at a hamfest, built a 28V DC supply for the autotune and put it on the air! Had a ball with it! FAIR RADIO is listed in my file MEGALIST.TXT aka MEGALIST.ZIP available as follows: Updated copies downloadable from BBSes at: (301) 681-7782, (301) 942-2218, (301) 299-3292, (301) 563-1306 (301) 417-6952, (202) 619-1494, (202) 208-7679 FTP site is at ftp.Lehigh.EDU. Login as anonymous, and use your e-mail address as the password. FTP: ftp://ftp.lehigh.edu/pub/listserv/qrp-l/misc/megalist.txt WWW: http://qrp.cc.nd.edu/QRP-L/index.html WWW: http://www.nd.edu/~shideg/ megalist.txt manuals.txt dealers.txt tubes.txt xtals.txt ======== LD>> Fair Radio in Lima Ohio has the ART-13 available in surplus again for $15 0 LD>It covers 2-18 Mhz LD>> (and is easily re-worked for 160 thru 10 meters) and uses an 813 modulate d LD>with a pair of LD>> 811's. You might have more fun rebuilding the ART if you just want to run LD>the 813's! LD>Hey, I had one of these things many years ago. Watching the autotune LD>operate is more fun than a barrel of monkeys. What's the address for LD>Fair Radio? LD>Larry ************************* The Evolution of Contemporary Thought: ----> McHale's Navy -> -> Mikhail Gorbachev -> ----------> Al Gore -> -------> Gore Vidal -> ----> Vidal Sassoon........ A natural progression! --- þ SLMR 2.1a þ From lwbyppp@epix.net Wed Feb 21 16:05:55 1996 From: dpsquigg@acs.eku.edu Newsgroups: rec.radio.amateur.homebrew Subject: Re: 813 Xmtr for 160M Message-ID: <1996Feb18.222359.7597@acs.eku.edu> Date: 18 Feb 96 22:23:59 -0500 Check the ARRL Operating Manual for the 160M windows that are used in different parts of the world. I really made me appreciate OUR frequency allocations!!! From lwbyppp@epix.net Wed Feb 21 16:05:57 1996 Newsgroups: rec.radio.amateur.policy,rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc From: dbaker@mail.bcpl.lib.md.us (Donald I. Baker) Subject: Re: 82 Repeater in Kansas City, TXxID-1 Message-ID: Date: Sun, 18 Feb 1996 02:18:32 GMT References: <4efpb3$pt2@alpha.sky.net> <4ete1q$b0o@bcarh8ab.bnr.ca> <4fgm3h$7n3@abyss.West.Sun.COM> <4g6ard$han@news.pacifier.com> In article <4g6ard$han@news.pacifier.com> narc@pacifier.com () writes: >From: narc@pacifier.com () >Subject: Re: 82 Repeater in Kansas City, TXxID-1 >Date: 18 Feb 1996 04:44:29 GMT >I WRITE: > Of course if you are a smart jammer like myself. You simply >construct a simple automatic rf sensing switch box. Simply made from rip >off shack parts. What it does is for the first 100mills on the tx my rf >output is directed into a small 10 watt 50 ohm dumy load, after the cap >charges up it causes the relay to swithc me over to my antenna. >VAWALLLLAAAAA NO fingerprint. Of course no fingerprint is a fingerprint. >but now i cant give out all my secrets can I? >jeff aa7up >PDX, or of course you could just mod the radio so that the final is "up" all the time and just switch the link between the driver and final........... Donald I. Baker Reville Engineering Services 4619 Schenley Road Baltimore, MD 21210-2525 (410) 467-7163 Custon Harsh Environment Computers and RF Products "Where no PC has gone before..." From lwbyppp@epix.net Wed Feb 21 16:05:59 1996 Newsgroups: rec.radio.amateur.homebrew From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: ? transverter 10m-70cm Message-ID: <1996Feb15.174219.13141@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) References: <4fsn2a$93b@rznews.rrze.uni-erlangen.de> Date: Thu, 15 Feb 1996 17:42:19 GMT In article <4fsn2a$93b@rznews.rrze.uni-erlangen.de> hsreiser@cip.informatik.un i-erlangen.de (Hans Reiser (CIP 95)) writes: >I intend to build a transverter 10m<->70cm (maybe also 10m-23cm), and >i'm looking for any information about this. Any hints how to do >so would be appreciated, as well as sources for schematics, literatur, >etc, and personal experiences with this. >One additional intended use of my project is in digital communication, >and therefor I'm especially interested in the capability of >full-duplex operation (simultanious TX and RX), and fast (electronic) >TX/RX switching. And of course I'm interested also in >low-budget-designs... :-) Get a copy of the RSGB VHF DX book. There are a number of good transverter designs in there as well as good material on designing your own. 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 lwbyppp@epix.net Wed Feb 21 16:06:00 1996 From: hsreiser@cip.informatik.uni-erlangen.de (Hans Reiser (CIP 95)) Newsgroups: rec.radio.amateur.homebrew Subject: ? transverter 10m-70cm Date: 14 Feb 1996 13:11:38 GMT Message-ID: <4fsn2a$93b@rznews.rrze.uni-erlangen.de> Summary: Looking for information about building an 10m-70cm transverter Hello! I intend to build a transverter 10m<->70cm (maybe also 10m-23cm), and i'm looking for any information about this. Any hints how to do so would be appreciated, as well as sources for schematics, literatur, etc, and personal experiences with this. One additional intended use of my project is in digital communication, and therefor I'm especially interested in the capability of full-duplex operation (simultanious TX and RX), and fast (electronic) TX/RX switching. And of course I'm interested also in low-budget-designs... :-) Thanks for your replies. Hansi. ----- Hansi Reiser, dl9rdz WWW-URL: packet radio: From lwbyppp@epix.net Wed Feb 21 16:06:01 1996 From: rstapestry@aol.com (RStapestry) Newsgroups: rec.radio.amateur.homebrew Subject: ANCIENT W.M Welch Oscilliscope, Info needed!!! Date: 15 Feb 1996 19:57:12 -0500 Message-ID: <4g0kp8$8q4@newsbf02.news.aol.com> Reply-To: rstapestry@aol.com (RStapestry) ANCIENT W.M Welch Oscilliscope, Info needed!!! Hello. I've been posting q's about GPS, haven't found too much info. HOWEVER!!! I recently acquired a Cathode Ray Oscilliscope from my Physics teacher, with a little coaxing, and I have no clue how to make it run again. It has vacuum tubes and a huge CRT projector. It's a work of art, however it looks like it was soldered together by a two year old. Technical information. It's a W.M. Welch CROscilliscope, 115 volts, 50-60 cycles, 35 watts. CRT projector is model... Phillips JAN-CNY-5cpl Vacuum tubes: RCA 2x2-879 RCA 6x4 CBS 6CG7 Sylvania 6AU6 (two of these) There are two huge capacitors Solar CP70E 1FH504K 1500WVDC .5 mFd Asst. large resistors. Ancient transformers. My best estimates are that it's 40's vintage. I want to get this thing to work. If anyone knows of technical data, and replacement parts for one of these, Please let me know. Thanx, Dave. From lwbyppp@epix.net Wed Feb 21 16:06:02 1996 From: Roland S Geter PhD Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.noncomm,rec.radio.scanner,rec.radio.swap Subject: Re: Broadcasting Radio Station Database for you...... Date: 17 Feb 1996 07:47:44 GMT Message-ID: <4g4170$hl2@news1.goodnet.com> References: <4fme8u$bsf@news.flinet.com> To: chuck@mail.flinet.com Hi Chuck, Let's try to get the database over here on this provider, OK? Thanks Roland S Geter PhD roland@mycronet.com From lwbyppp@epix.net Wed Feb 21 16:06:03 1996 From: johnsonhe@aol.com (JohnsonHE) Newsgroups: rec.radio.amateur.homebrew Subject: crystal lattice filters Date: 19 Feb 1996 17:48:58 -0500 Message-ID: <4gauoq$4nr@newsbf02.news.aol.com> Reply-To: johnsonhe@aol.com (JohnsonHE) Looking to purchase several of the old McCoy 9 MHz crystal lattice filters . These carried the nickname Silver sentinal and Golden Guardian. SSB bandwidths only. Please direct response to e-mail address Johnsonhe@aol.com From lwbyppp@epix.net Wed Feb 21 16:06:04 1996 From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Driving a CCD/ Building a CCD camera Date: Sat, 17 Feb 1996 22:30:42 LOCAL Message-ID: References: <4g5sg9$ago@newsbf02.news.aol.com> In article <4g5sg9$ago@newsbf02.news.aol.com> thebots@aol.com (TheBots) writes : >From: thebots@aol.com (TheBots) >Subject: Driving a CCD/ Building a CCD camera >Date: 17 Feb 1996 19:39:37 -0500 >How might I go about constructing a CCD camera out of components? Can >anyone direct me to schematics? Buy "The CCD Camera Cookbook" by Veikko Kanto, KB7UCZ, and John Munger, N7WBQ. The publisher is Willmann-Bell, Box 35025, Richmond, VA 23235, (804) 320-7016. This will take you through theory to construction and operation of a CCD camera. The book includes software for trouble shooting and image processing. I'm not sure of the cost, but I believe it's under $20. Have fun. 73, Wes -- N7WS From lwbyppp@epix.net Wed Feb 21 16:06:06 1996 From: jlkolb@sd.cts.com (John Kolb) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Re: DS-1A (DC-DC converter for Kenwood) question Date: 19 Feb 1996 21:27:31 GMT Message-ID: <4gaq03$3sh@news3.cts.com> References: <4ft09j$ias@crchh327.rich.bnr.ca> charles copeland (charles1@netcom.com) wrote: : In article <4ft09j$ias@crchh327.rich.bnr.ca>, : Ken Edwards wrote: : >I have a Kenwood TS-820S that I would like to run off battery in : >cases of emergency. And as a (good ?) homebrew project, I thought : >I could emulate the offering from the manufacturer. Problem is, : >the information in the back of the service manual is sufficently : >ambigeous enough that I have a few questions. : > : >Is the transformer shown part of the DC-DC converter kit, or is : >it the one already in the radio, with the barrier strip that already : >has the matching color coded wires ? : > : >The drawing shows the same connector as used for AC input, but wired : >for DC, then another "power connector" thet does not appear to match : >the previous which interrconnects with the barrier strip. How exactly : >is the power (DC) connected into the system ? I've looked into this for my TS-520SE. The DC version TS-520S (or did I reverse the two names?) has an added heatsink on the back with two switching transistors, wired to a terminal strip in the rig. The power transformer is different, however. It has an added winding to serve as a low voltage primary, switched by the transistors. To convert to 12V DC in you would have to change the transformer and add the heat sink/transistors on the back. John Kolb KK6IL From lwbyppp@epix.net Wed Feb 21 16:06:07 1996 From: pdrunen@aol.com (PDRUNEN) Newsgroups: rec.radio.amateur.homebrew Subject: DTMF Program/Schematics Date: 18 Feb 1996 02:18:22 -0500 Message-ID: <4g6jru$jc9@newsbf02.news.aol.com> Reply-To: pdrunen@aol.com (PDRUNEN) Hello everyone, I have a DTMF program and the associated schematic free to anyone interested. The hardware is a simple two chip circuit which connects into your existing Parallel port, the port where the printer is connected. The schematics are in a GIF format so you need a GIF viewer. If you want it, e-mail me at PDRUNEN@AOL.COM and I will send it via the Internet! Paul From lwbyppp@epix.net Wed Feb 21 16:06:08 1996 From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ferric Chloride Question Date: 15 Feb 1996 18:01:37 GMT Distribution: world Message-ID: <4fvse1$jme@hpcvsnz.cv.hp.com> References: <4fthmc$g0h@meaddata.lexis-nexis.com> John Heck (jkh@meaddata.com) wrote: : In article q7c@shore4.intercom.net, "Steven A. Bailey" writes: : >I am wondering the ramifications of dumping some : >dilluted ferric chloride out in my yard (used for : >PCB etching). Seems this is a very weak acid...even : >when at full strength. Any ideas are welcome. : I believe that if you dilute it well you may spray it on your yard and it wi ll do a : nice job of greening it up(in warm weather, of course). Ferric cloride is ac idic : but not a strongly so as, say hydrogen cloride(muriatic acid), since iron do es not : hold on to its outer electrons as well(being large) as hydrogen, and so ioni zes much : more easily. Iron plays an important role in the manufacture of clorophyll a nd this, : of course makes the grass green. Two comments: if it's spent, after etching copper-clad board, the copper sure won't help the plant life much. And if it's not used, the Fe+3 is a fairly strong oxidant (etches copper after all), and may not be as good for plants as Fe+2. Second, you can't dissolve very much ferric ion in neutral water! The solubility product of ferric hydroxide is something like 10^-36, so if you want one molar ferric ion, plan on getting the hydroxide down to about 10^-12, which means the hydrogen ion must be 10^-2, or pH=2 or less. In other words, to get ferric chloride to dissolve appreciably in water, you must make the water acidic. Otherwise you get ferric hydroxide precipitate, brown "glop". In fact, by the act of precipitating, it leaves behind hydrogen ion, so whether you add acid to get everything to dissolve, or just remove hydroxide by letting Fe(OH)3 precipitate, you've made hydrochloric acid solution. It's not terribly strong, but do treat it with some respect. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Wed Feb 21 16:06:09 1996 Newsgroups: rec.radio.amateur.homebrew From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Ferric Chloride Question Message-ID: <1996Feb15.170617.12898@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) References: <4freng$q7c@shore4.intercom.net> Date: Thu, 15 Feb 1996 17:06:17 GMT In article <4freng$q7c@shore4.intercom.net> "Steven A. Bailey" writes: >I am wondering the ramifications of dumping some >dilluted ferric chloride out in my yard (used for >PCB etching). Seems this is a very weak acid...even >when at full strength. Any ideas are welcome. Have your local agricultural extension agent send a soil sample off to your land grant university. That'll tell you how iron deficient your soil is, and how much ferric chloride to apply per acre. If you grow tomatos, a bit of ferric chloride on the root ball will prevent blossom end rot. In other words, use of this chemical for agricultural purposes is common, so I wouldn't worry about putting it on the yard. Dilute and spray, don't dump it in one spot. Note however, if this is *spent* etching solution, avoid using it on agricultural crops. Cupric chloride is toxic. Dispose as a hazardous waste. 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 lwbyppp@epix.net Wed Feb 21 16:06:10 1996 From: kd6kml@napanet.net (Josh Heide, KD6KML) Newsgroups: rec.radio.amateur.homebrew Subject: For Sale: general Electric Manuals, and some Motorola Date: 18 Feb 1996 21:35:55 GMT Message-ID: <4g863r$iod@taz.napanet.net> I have General Electric service manuals from the late 50's to the late 80' for sale. I also have some Motorola, also. I will sell complete manuals or just the sections you need. Please contact me via e-mail for prices and availibility. Also, if you would, please include a phone number and the best time to reach you. JOSH KD6KML kd6kml@napanet.net From lwbyppp@epix.net Wed Feb 21 16:06:11 1996 From: Robert Rolfness Newsgroups: rec.radio.amateur.homebrew Subject: FS: Jenning Vacuum Caps Date: Sun, 18 Feb 1996 14:40:22 -0800 Message-ID: I have for sale two models of Jennings Vacuum Variable Capacitors for $60 each. These are type UCS-375, 375 pfd. at 14,000 volt and type UCS-750, 750 pfd. at 14,000 volt. 73, Bob W7VZX From lwbyppp@epix.net Wed Feb 21 16:06:12 1996 From: greends01@aol.com (GreenDS01) Newsgroups: rec.radio.amateur.homebrew Subject: FS: K-Band Radar unit Date: 19 Feb 1996 23:33:08 -0500 Message-ID: <4gbiu4$cqa@newsbf02.news.aol.com> Reply-To: greends01@aol.com (GreenDS01) For sale: KR-11 Kustom Signals mobile radar unit. Just calibrated in 95. can be used stationary or moving. Auto or manual modes with overspeed indicator. Both target and patrol speed windows. Comes with case. Asking $400.00. includes shipping. From lwbyppp@epix.net Wed Feb 21 16:06:12 1996 From: Mike Obermeier Newsgroups: rec.radio.scanner,alt.radio.scanner,rec.radio.amateur.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: Re: FT-8500 Need Mods Date: 15 Feb 1996 04:56:45 GMT Message-ID: <4fueef$hke@news.htp.com> References: <4fov69$l98@news.ios.com> To: rod@venus.hili.com The mod is easy. This will give you 137-174mhz and 410-470mhz Tx/Rx. 1. disconnect power and antenna (like, you would'nt of done it already.) 2. open up the case by removing the screws and gently removing the cover and unpluging the speaker. 3. locate and CUT the GREEN WIRE on the CONTROL BOARD ( the vertical board beh ind the control panel. 4. reassemble the radio. 5. RESET THE MICROPROCESSOR (so much for the memory!) (press and hold [D/M] & [REV] & [ENT] & turn the power on (got enough finge rs?). (turn off the radio). (press and hold [SCAN] & [HOME] & turn on the radio (extended RX mod). Tha, Tha, Tha, That's All Folks! From lwbyppp@epix.net Wed Feb 21 16:06:13 1996 From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: Heathkit Tubes Date: Mon, 19 Feb 96 09:22:14 PDT Message-ID: References: <4g6cu4$8ru@central.co.nz> In article <4g6cu4$8ru@central.co.nz>, writes: > I am trying to keep my very old Heathkit HW101 on the air. But am > having trouble sourcing 6HS6 RF amplifier tubes. I have tried many > sources of tubes, but so far without success. If there is anyone out > there with some new tubes to sell me, please contact me. > rwincer@central.co.nz > 73s Roger ZL2RX > Hi Roger, I just purchased a couple of those from International Components Corp 105 Maxess Road Melville, NY 11747 (800)645-9154 they cost $4.60 each. I would also expect Antique Electronics Supply to have them Antique Electronic Supply 6221 South Maple Ave Tempe, AZ 85253 (602)820-5411 73.....Jay From lwbyppp@epix.net Wed Feb 21 16:06:14 1996 From: rwincer@central.co.nz (Roger Wincer) Newsgroups: rec.radio.amateur.homebrew Subject: Heathkit Tubes Date: 18 Feb 1996 05:20:04 GMT Message-ID: <4g6cu4$8ru@central.co.nz> I am trying to keep my very old Heathkit HW101 on the air. But am having trouble sourcing 6HS6 RF amplifier tubes. I have tried many sources of tubes, but so far without success. If there is anyone out there with some new tubes to sell me, please contact me. rwincer@central.co.nz 73s Roger ZL2RX From lwbyppp@epix.net Wed Feb 21 16:06:16 1996 From: frbspd@crl.com (Stephen Dunifer) Newsgroups: rec.radio.amateur.homebrew,sci.electronics.design Subject: Re: Help design coil for coupling 2 amplifiers Date: 12 Feb 1996 20:50:54 -0800 Message-ID: <4fp5be$6k4@crl7.crl.com> References: <4fkhdu$4e9@aldebaran.sct.fr> <1996Feb12.003037.24437@ke4zv.atl.ga.us> Gary Coffman (gary@ke4zv.atl.ga.us) wrote: : In article <4fkhdu$4e9@aldebaran.sct.fr> opworld@worldnet.fr writes: : >I would like to add the power of two identical amplifiers in 80-120MHz : >range with 300W each. : > : >I don't know how. : > : >I believe that you have to apply signal to each amplifier (invert one : >signal like LF amplifier ?) adapting impedance (50 ohms -> 50 + 50 : >ohms). For output add power with impedance matching. : What you need is called a Wilkinson power splitter/combiner. This : will divide the drive power equally between the amplifiers, and : combine their output powers. Phase is maintained identical through : both paths, except for the differences in phase internal to the two : amplifiers. That can be compensated by using an adjustable phase : shifting network at the input of one of the amplifiers, IE a line : stretcher or the like, and adjusting to null reject power. You : may also need to be able to control the gain of one of the amplifiers : so that you can exactly match amplitude response too, again adjusting : to null reject power. : Wilkinson networks are easy to build for a specific frequency. In : your range they would just be lengths of coax and a reject load : resistor. To cover the entire 80-120 MHz spread without retuning : would be more difficult. See any RF handbook for details of building : Wilkinson splitters and combiners. : Gary : -- : Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary : Destructive Testing Systems | we break it. | emory!kd4nc!ke4zv!gary : 534 Shannon Way | Guaranteed! | gary@ke4zv.atl.ga.us : Lawrenceville, GA 30244 | | Here are the dimensions for the Wilkinson Hybrid for 88-108 Mhz. Its center frequency is 97.49 Mhz. You will need two lengths of PTFE (Teflon) 75 ohm coaxial cable suitable for the power level being used. Do not use anything other PTFE cable. The length is 54.4 centimeters. connect in a V configuration. For the splitter to drive the two amps, at one end of the cables conncect the two center conductors together and the shieldst to ground, this is your input. At the other end of the two cable are your two output ports to the two amps. Shields are connected to ground with the two center conductor becoming the two output ports. A 100 ohm non-inductive resistor is connected between the two output ports. It has to have a dissipation equal to 1/2 of the applied power. For the combiner use the above configuration but the output ports become the input ports for the two amps and the input port becomes the output port. You will need a non-inductive resistor with a 150 watt capability, these are made especially for RF, contact Richardson Electronics for them. Stephen Dunifer From lwbyppp@epix.net Wed Feb 21 16:06:18 1996 From: nangwa@aol.com (Nan Gwa) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help design coil for coupling 2 amplifiers Date: 16 Feb 1996 11:18:12 -0500 Message-ID: <4g2ao4$qlu@newsbf02.news.aol.com> References: <4g20kf$qgq@aldebaran.sct.fr> In article <4g20kf$qgq@aldebaran.sct.fr>, opworld@worldnet.fr writes: > > Hi everybody > >Thanks a lot for documented answers. > >In order I learn something, is there a pratical book a pointer on the >net where I can get more informations about Wilkinson splitter ? > >Regards > > >Have >a nice opworld@worldnet.fr >Day > > You might want to get the book "Radio Frequency Transistors, Principles and Practical Applications" by Norm Dye and Helge Granberg of Motorola. Chapter 11, Power Splitting And Combining, may prove useful. The book is published by Butterworth-Heineman, 80 Montvale Avenue, Stoneham MA USA. Closer to home, you might try Linacre House, Jordan Hill, Oxford OX2 8DP, United Kingdom. The ISBN number is 0-7506-9059-3. (Listed at $49.95 U.S.) Tom Donaly KA6RUH From lwbyppp@epix.net Wed Feb 21 16:06:19 1996 From: pfzouave@aol.com (PFZouave) Newsgroups: rec.radio.amateur.homebrew Subject: Help:Low Power AM Broadcast Transmitter Date: 16 Feb 1996 20:27:40 -0500 Message-ID: <4g3auc$aiv@newsbf02.news.aol.com> Reply-To: pfzouave@aol.com (PFZouave) Is anyone familiar with the low-power AM broadcast transmitter(s) used by Airports, DMV's real estate agents, or drive-in theatres to broadcast local site-specific information to car radios? I know, for example, that some real estate outfit puts 'em in houses for sale, and you can hear the whole lowdown on the house by tuning in on your car radio. Some airports do the same thing to give local information on parking and rental cars. Is some sort of special license required? Who makes the hardware? Is it expensive? Any guidance or direction would be appreciated. Please email, though, my newsreader is less than reliable. /=====================================================/ / PFZouave@aol.com / / The absurdity of a claim is not a valid measure of its probability / /=====================================================/ From lwbyppp@epix.net Wed Feb 21 16:06:20 1996 From: Peter Shintani Newsgroups: rec.radio.amateur.homebrew Subject: How to make a simple Hi-Q loop Date: 20 Feb 1996 00:24:35 GMT Message-ID: <4gb4c3$qeb@oskgw.osk.sony.co.jp> Hi: I decided to throw away some efficiency for the sake of simplicity. Most HF hi-Q loop antenna are made in the shape of an octagon since this approximates a circle quite well. However, there are many 45 degree elbow joints which can cause the resistance to increase and thus reduce efficiency. Furthermore the use of a trombone capacitor for tuning is "neat" but is places hardware inside the loop and is difficult to align for smooth operation. I designed and built a square loop. Cut a 10 foot piece of 3/4" copper pipe into four equal lengths. Use two 90 degree elbows to join three of the pieces into a square. Attach a "T" fitting to the unattached open ends. Take t he remaining fourth piece of pipe, cut about an inch off of it, and then cut it in half, so that it is about 1.25 ft long. There are plastic pipe inline joint meant for 1/2" ID plastic pipe. 1/2' plastic pipe OD is very close to the OD of 3/4" copper pipe. Ream the inside ID out so that it makes a tight friction fit over the 3/4" copper pipe piece that is about 1.25 ft lon g. Slip the plastic joint over one of the 1.25 ft long piece. Fit a 1.25 ft piece into a "T" fitting, and do the similar to the other side. Finally, tightend th e plastic joint to make a rigid square. No alignment problems. Sweat solder the T fittings and 90 degree elbows. Make sure to push the plasti c joint away from the side being soldered, it might be deformed from the heat of solde ring. Buy and cut a +2.5 ft length of 1/2" pipe and solder some nuts into the ends, cover with heat shrink tubing. Slide the 1/2" heat shrink covered pipe into the loop through the "T" fittings to make a variable capacitor. Use a threaded rod to move the 1/2" pipe with a low rpm motor. A gamma match is used to match the coax to the loop, it should be centered op posite the plastic joint, and it's lenth should be about 1/4 the length of the main l oop. I used a ferrite bead balun but I haven't confirmed if it hurts or helps. The piece of RG-58, I had already had 70 beads on it from a previous project. As is the antenna tunes from 10~30 MHz. If a vacum variable is used place of t he coaxial capacitor, the distributed capacitance affect is reduced so with a 5~2 00pF unit, the tunning range is from 6.8~30 MHz. Good luck and I welcome all comments. Peter From lwbyppp@epix.net Wed Feb 21 16:06:21 1996 From: William Vaughn Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Re: Ignition noise reduction Date: 18 Feb 1996 01:35:18 GMT Message-ID: <4g5vom$oab@olympus.net> References: <4g0j7q$3nu@news.esslink.com> <312615FA.523@halcyon.com> Paulc, You did not mention the age or type of vehicle. These are important factors since different models manifest there noise in different ways. One of the biggest problems in vehicles and boats are the alternators. A good preventitive maintenance item is to take your vehicle to an electrical shop and have them rebuild it. If that doesn't work then you might need an alternator filter. The marine types work best don't waste your money on the radio shack units. Install the filter as close to the output of the alternator as possible. The caps across all small motors and the bonding of body panels works good too. From lwbyppp@epix.net Wed Feb 21 16:06:22 1996 From: "Gary P. Fiber" Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Re: Ignition noise reduction Date: Sat, 17 Feb 1996 09:52:58 -0800 Message-ID: <312615FA.523@halcyon.com> References: <4g0j7q$3nu@news.esslink.com> Paul A. Cianciolo wrote: > > Hello all > > Has anyone ever done any work to quiet down the ignition system (spark > impulse noise) in a gasoline powered vehicle?? I wonder if one could > use large ferrite beads to choke off the spectrum of the spark from > radiating off the wire at the frequencies of interest. 1 mhz and > above? I have done a lot of grounding , and am using resistor plugs > and wires.. Are there any shielded wire kits out there? > > PaulC > "Noisy in Connecticut" I bonded my entire vehicle a few years back. The interference from ignition dropped from S-9 to S-2. Follow thw suggestions in the Radio Amateurs Handbook for mobile installiations. Most police vehicles use the same type of body panel bonding where all of the panels are connected with braid. it does work quite well. Also you might want to install some 0.01 uf disc ceramic caps across the heater motor leads and wiper motor leads. This helped quiet them down too. Gary From lwbyppp@epix.net Wed Feb 21 16:06:23 1996 From: paulc@esslink.com (Paul A. Cianciolo) Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Ignition noise reduction Date: Thu, 15 Feb 1996 14:10:13 GMT Message-ID: <4g0j7q$3nu@news.esslink.com> Hello all Has anyone ever done any work to quiet down the ignition system (spark impulse noise) in a gasoline powered vehicle?? I wonder if one could use large ferrite beads to choke off the spectrum of the spark from radiating off the wire at the frequencies of interest. 1 mhz and above? I have done a lot of grounding , and am using resistor plugs and wires.. Are there any shielded wire kits out there? PaulC "Noisy in Connecticut" From lwbyppp@epix.net Wed Feb 21 16:06:24 1996 From: Siegfried Rambaum Newsgroups: sci.electronics.design,rec.radio.amateur.misc,rec.radio.amateur.homebrew Subject: Re: Ignition noise reduction Date: Wed, 21 Feb 1996 13:16:06 -0500 Message-ID: References: <4g0j7q$3nu@news.esslink.com> In our county, I have seen some stickers "NEED HELP - CALL YOUR SHERIFF". This might seem a bit farfetched for your problem, but think of it. Those guys drive in cars, and they are radio equipped. Just call your local office and ask your way through to the guy in charge for maintaining the cars. That guy should know all the tricks about grounding. And chances are, it might be a ham, too :) At least, it wont hurt to try it that way. On Thu, 15 Feb 1996, Paul A. Cianciolo wrote: > Hello all > > Has anyone ever done any work to quiet down the ignition system (spark > impulse noise) in a gasoline powered vehicle?? I wonder if one could > use large ferrite beads to choke off the spectrum of the spark from > radiating off the wire at the frequencies of interest. 1 mhz and > above? I have done a lot of grounding , and am using resistor plugs > and wires.. Are there any shielded wire kits out there? From lwbyppp@epix.net Wed Feb 21 16:06:26 1996 From: David Nulton Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Subject: Need Contact for Don Johnson RE: Screwdriver Antenna Date: 19 Feb 1996 16:29:36 GMT Message-ID: <4ga8hg$k9a@alterdial.UU.NET> If anyone knows an email address, snail mail address, phone number, callsign, anything...please forward. I want to enquire about his "screwdriver antenna" design. 73s de KI5XW From lwbyppp@epix.net Wed Feb 21 16:06:26 1996 From: Hank Blackstock Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.antenna Subject: Re: Need Contact for Don Johnson RE: Screwdriver Antenna Date: 19 Feb 1996 22:27:00 GMT Message-ID: <4gatfk$cba@ionews.ionet.net> References: <4ga8hg$k9a@alterdial.UU.NET> To: dnult@axiom.net David Nulton wrote: >If anyone knows an email address, snail mail address, phone >number, callsign, anything...please forward. I want to enquire >about his "screwdriver antenna" design. > >73s >de KI5XW > Callsign is W6AAQ. 73 Hank WA5JRH From lwbyppp@epix.net Wed Feb 21 16:06:27 1996 From: Jim Brown Newsgroups: rec.radio.amateur.homebrew Subject: Need GE LBI-3615 Manual Date: Wed, 14 Feb 1996 21:30:06 -0500 Message-ID: <31229AAE.259A@conterra.com> Reply-To: starman@conterra.com I am looking for the manuals for a GE LBI-3615 GE Power Amp Model 4EF5A1 Rev. B. If anyone has this manual I would be happy to pay for the duplication and cost of mailing. Thanks es 73 de WM3O From lwbyppp@epix.net Wed Feb 21 16:06:28 1996 From: ctyoung@mtu.edu (Charles T. Young) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NEED GPS INFORMATION MY NEW HOBBY!!! Date: 18 Feb 1996 22:09:05 -0500 Message-ID: <4g8pkh$3ds@geofac7.geo> References: <4fpefq$pf8@newsbf02.news.aol.com> RStapestry (rstapestry@aol.com) wrote: : I wish to build a working GPS reciever. Can anyone out there provide me : with links to the technical data and/or circut designs to build one? : I don't believe that it's proprietary, so someone out there must have : built their own... right? : Any help is appreciated. : : Btw, I'm 16 and also into robotics. Parts Donations Welcome (low budget : here!!). : Thanx I suggest that you don't bother to build your own. They look really complicated, full of proprietary software. I think GPS is fascinating but you will end up with a whole tabletop full of stuff to emulate what goes on in a pocket sized case. I think you are best off saving your money do buy one and finding interesting things to do with it. There have been articles in 73 Amateur Radio Today and QST about things to do with store-bough GPSs, but they dont build them for the same reason they don't build their own handi-talkies. Chuck Young ctyoung@mtu.edu From lwbyppp@epix.net Wed Feb 21 16:06:30 1996 From: ericw@iaehv.nl (Eric-Jan Wösten) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NEED GPS INFORMATION MY NEW HOBBY!!! Date: Mon, 19 Feb 1996 10:17:47 GMT Message-ID: <4g9lld$7mp@iaehv.IAEhv.nl> References: <4fpefq$pf8@newsbf02.news.aol.com> <4g8pkh$3ds@geofac7.geo> Reply-To: ericw@iaehv.nl ctyoung@mtu.edu (Charles T. Young) wrote: >RStapestry (rstapestry@aol.com) wrote: >: I wish to build a working GPS reciever. Can anyone out there provide me >: with links to the technical data and/or circut designs to build one? >: I don't believe that it's proprietary, so someone out there must have >: built their own... right? >: Any help is appreciated. >: >: Btw, I'm 16 and also into robotics. Parts Donations Welcome (low budget >: here!!). >: Thanx >I suggest that you don't bother to build your own. They look really >complicated, full of proprietary software. I think GPS is fascinating >but you will end up with a whole tabletop full of stuff to emulate >what goes on in a pocket sized case. >I think you are best off saving your money do buy one and finding >interesting things to do with it. >Hi! Sure you can build one....it's been done by Madjaz Vidmar in I think is called VHF-Communications, a German magazine and as far as I know also available in the USA.... I'm sure that building a trx for example for HF which is good, is more expensive than buying one, so the price is not always an argument. I'm at my qrl here, if someone wants to know exactly which VHF-COMM decribes the GPS-system, just let me know. 73, Eric \ Eric-Jan Wosten DDS \ Best, Holland ========================= Internet: ericw@iaehv.nl AMPRnet: pa3cev@pa3cev.ampr.org AX25:pa3cev@pi8zaa.#bra.nld.eu From lwbyppp@epix.net Wed Feb 21 16:06:32 1996 From: ab5p@swcp.com (Brett Coningham) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Handheld Doppler Ant Circuit Date: Sun, 18 Feb 1996 20:40:57 GMT Message-ID: <4g82tb$2mg@sloth.swcp.com> References: <4g0inc$dsj@atlas.uniserve.com> Hi Steve, I'll bet you are looking for the "Handi-Finder", which was described in QST, May, 1993, pg. 35. This circuit was not really a doppler design, but one of the "time difference of arrival" designs. I don't have a fax at home, and cannot use the work fax for personal use (even collect), but maybe one of the other folks reading this can help. If all else fails, I CAN mail you a copy. Let me know. 73 de Brett AB5P ------------------------------- crawford@uniserve.com wrote: >Hello: >It never fails, you keep a magazine for years and one day decide you >should toss it out. Within seconds of the garbage man taking it away, >you NEED an article from it!!! >I'm looking for an article on building a handheld D.F. antenna with a >small doppler circuit on the handle. This particular one looked like a >bow tie antenna on a short handle with a 9vdc battery and PCB doppler >circuit attached. I can't remeber which mag it was in, but it was a >few years old. >If you have the article or a similar circuit, can you PLEASE contact >me and I'll pay for costs to get a copy. >If you wish, you could fax it to me, call my voice phone number and >I'll arrange for the fax to be collect. >Steve Crawford, VE7IIF >Ph: (604) 826-6295 >Fax: (604) 826-4930 >PGP Fingerprint: 31 CD 7E DA 1B E3 8A 14 E2 9B 0D D8 C5 27 23 38 >Finger: crawford@uniserve.com for PGP Public Key >Steve Crawford >PGP Fingerprint: 31 CD 7E DA 1B E3 8A 14 E2 9B 0D D8 C5 27 23 38 >Finger: crawford@uniserve.com for PGP Public Key ab5p@swcp.com Albuquerque Transmitter Hunting Homepage: http://www.swcp.com/~ab5p/foxhunt.html From lwbyppp@epix.net Wed Feb 21 16:06:33 1996 From: crawford@uniserve.com Newsgroups: rec.radio.amateur.homebrew Subject: Need Handheld Doppler Ant Circuit Date: 16 Feb 1996 00:22:04 GMT Distribution: world Message-ID: <4g0inc$dsj@atlas.uniserve.com> Reply-To: crawford@uniserve.com Hello: It never fails, you keep a magazine for years and one day decide you should toss it out. Within seconds of the garbage man taking it away, you NEED an article from it!!! I'm looking for an article on building a handheld D.F. antenna with a small doppler circuit on the handle. This particular one looked like a bow tie antenna on a short handle with a 9vdc battery and PCB doppler circuit attached. I can't remeber which mag it was in, but it was a few years old. If you have the article or a similar circuit, can you PLEASE contact me and I'll pay for costs to get a copy. If you wish, you could fax it to me, call my voice phone number and I'll arrange for the fax to be collect. Steve Crawford, VE7IIF Ph: (604) 826-6295 Fax: (604) 826-4930 PGP Fingerprint: 31 CD 7E DA 1B E3 8A 14 E2 9B 0D D8 C5 27 23 38 Finger: crawford@uniserve.com for PGP Public Key Steve Crawford PGP Fingerprint: 31 CD 7E DA 1B E3 8A 14 E2 9B 0D D8 C5 27 23 38 Finger: crawford@uniserve.com for PGP Public Key From lwbyppp@epix.net Wed Feb 21 16:06:34 1996 From: whowell@epix.net Newsgroups: rec.radio.amateur.homebrew Subject: need info..sorenson power supply Date: Mon, 19 Feb 96 09:27:31 PDT Message-ID: i need any literature,schematics for a dcr10-40b sorenson power supply. made by raytheon co. email whowell@epix.net call 610 588 4463 de bill n3ipj From lwbyppp@epix.net Wed Feb 21 16:06:35 1996 From: iaeste@studorg.uio.no (IAESTE Oslo) Newsgroups: rec.radio.amateur.homebrew Subject: Need: Scematics for CW tranciever Date: 19 Feb 1996 09:31:47 GMT Message-ID: <4g9g23$lvg@ratatosk.uio.no> Hi! As a (fairly) new radio amateur, I am planning to go to Malta for the summer holliday, and then take along a CW tranciever. Therefore, I am looking for the posibillities to build one myself. I only need the simplest of CW trancievers, something that's light and easy to make, one band is enough. I hope some friendly person out there would point me to some inforemation about this, on WWW or ftp, or email: jane@ifi.uio.no 73 de LC1MAT/LB4PE packet: LC1MAT@LA4O.OSL.A.NOR.EU From lwbyppp@epix.net Wed Feb 21 16:06:36 1996 From: kmiller@airmail.net (Kerry W. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Not a binaries group? QRP Schematics Date: Sat, 17 Feb 1996 19:39:29 GMT Message-ID: <4g5aus$9c7@news-f.iadfw.net> References: <4f0sru$as8@news-f.iadfw.net> <4g51h1$7vu@cloner3.netcom.com> timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI ) wrote: >Well Mr. Woolley, where exactly would you want QRP schematics posted? >I don't understand why you would not post it here since this is a >newsgroup dedicated to QRP, schematics, building, etc. >Tim Hynde >ka8ddz Tim, Thanks, but I'll save you the "flame job" that I got for asking and then posting the first one! I knew it was poor netiquette to post binaries on a non-binary news group, but after I asked and got several positive responses, I did it with the first and smallest one to give it a try. Apparently there is quite a bit of lag time on some servers, I got negative responses after I posted the file. The problem with binaries is that several folks apparently get this newsgroup through a mailing list, therefore they get everything that gets posted whether they want it or not. A binary file takes too much time for them to download, especially if they are paying by the minute. I posted the short one first to give it a try, but now have found a better way. All of the schematics will be on John Cunliffe's web page at: www.frontiernet.net/~cunliffe He'll put them up as soon as he gets them. I already sent him the first two files. This way, the guys who get the newsgroup from a list won't have to put up with it. When he gets all the files posted, I'll drop a note on here. Thanks for the help, but the guys are right, it really isn't the best way to do it, it was just the only way I had at the time! 73, Kerry Miller WD5ABC Loook for us on Field Day - N5 Big Texas Hombres (N5BTH) at 5 watts! From lwbyppp@epix.net Wed Feb 21 16:06:38 1996 From: Leon Heller Newsgroups: rec.radio.amateur.homebrew Subject: Re: RE:Not a binaries group? QRP Schematics Date: Sat, 17 Feb 96 20:58:50 GMT Message-ID: <824590730snz@lfheller.demon.co.uk> References: <4f0sru$as8@news-f.iadfw.net> <4g51h1$7vu@cloner3.netcom.com> Reply-To: Leon@lfheller.demon.co.uk In article <4g51h1$7vu@cloner3.netcom.com> timhynde@ix.netcom.com(Tim "Tim Hynde ka8ddz/qrp Rochester, MI " writes: > In regards to the QRP schematics scanned and ready, > > > >In article , wrote: > >> > >>I think here is as good a place as any to post them. Personally I > would > >>prefer JPEG's. I would start with one and see what kind of response > you get. > >>They should be uuencoded first. > > > >Do not post them here. This is not a binaries group and news admins > don't > >like hidden binaries groups; they are even more likely to block them > than > >overt binaries groups. > > > >JPEG is not a good format for line drawings. TIFF FAX, PCX and GIF > are > >all better at handling them (JPEG is very good for natural images, > though). > >-- > >David Woolley, London, England david@djwhome.demon.co.uk > > > Well Mr. Woolley, where exactly would you want QRP schematics posted? > I don't understand why you would not post it here since this is a > newsgroup dedicated to QRP, schematics, building, etc. David is quite right, images and binaries have no place on a newsgroup like this. The schematics should be put on a server somewhere, so that they can be downloaded using ftp. A short periodic posting could then be made to inform people where they are, or a mention made in the group's FAQ. This way, they are always available, people know where they are, and bandwidth isn't wasted distributing them to people who don't want them. This is simply good "netiquette", and is probably in this group's charter, that was promulgated when it was formed, and should also be in the FAQ, if one exists. 73, 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 lwbyppp@epix.net Wed Feb 21 16:06:39 1996 From: mulveyr@ll.aa2ys.ampr.org (Rich Mulvey) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Not a binaries group? QRP Schematics Date: 17 Feb 1996 21:13:06 GMT Message-ID: References: <4f0sru$as8@news-f.iadfw.net> <4g51h1$7vu@cloner3.netcom.com> Reply-To: mulveyr@vivanet.com On 17 Feb 1996 16:59:13 GMT, Tim Hynde ka8ddz/qrp Rochester, MI wrote: > In regards to the QRP schematics scanned and ready, > > >>In article , wrote: >>> >>>I think here is as good a place as any to post them. Personally I >would >>>prefer JPEG's. I would start with one and see what kind of response >you get. >>>They should be uuencoded first. >> >>Do not post them here. This is not a binaries group and news admins >don't >>like hidden binaries groups; they are even more likely to block them >than >>overt binaries groups. >> >>JPEG is not a good format for line drawings. TIFF FAX, PCX and GIF >are >>all better at handling them (JPEG is very good for natural images, >though). > >Well Mr. Woolley, where exactly would you want QRP schematics posted? >I don't understand why you would not post it here since this is a >newsgroup dedicated to QRP, schematics, building, etc. You wouldn't want to post it here, because it's generally considered to be poor USENET practice - many people pay for their news/mail feeds, and don't particularly like paying for massive posts in discussion groups. Not to mention that the ignorant poster will quite likely be mail-bombed. :-) The *PROPER* way is to post a short note indicating the FTP site where the schematic can be retrieved, or the address of a web page where it can be viewed. As it happens, there is a QRP mailing list at lehigh.edu that also has an FTP site full of QRP-related material. That would be a fine place to put it. - Rich --- Rich Mulvey, aa2ys Rochester, NY USA mulveyr@vivanet.com aa2ys@net.wb2psi.ampr.org aa2ys@wb2psi.#wny.ny.us From lwbyppp@epix.net Wed Feb 21 16:06:40 1996 From: timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI ) Newsgroups: rec.radio.amateur.homebrew Subject: RE:Not a binaries group? QRP Schematics Date: 17 Feb 1996 16:59:13 GMT Message-ID: <4g51h1$7vu@cloner3.netcom.com> References: <4f0sru$as8@news-f.iadfw.net> In regards to the QRP schematics scanned and ready, >In article , wrote: >> >>I think here is as good a place as any to post them. Personally I would >>prefer JPEG's. I would start with one and see what kind of response you get. >>They should be uuencoded first. > >Do not post them here. This is not a binaries group and news admins don't >like hidden binaries groups; they are even more likely to block them than >overt binaries groups. > >JPEG is not a good format for line drawings. TIFF FAX, PCX and GIF are >all better at handling them (JPEG is very good for natural images, though). >-- >David Woolley, London, England david@djwhome.demon.co.uk Well Mr. Woolley, where exactly would you want QRP schematics posted? I don't understand why you would not post it here since this is a newsgroup dedicated to QRP, schematics, building, etc. Tim Hynde ka8ddz From lwbyppp@epix.net Wed Feb 21 16:06:42 1996 From: rkarlqu@scd.hp.com (Richard Karlquist) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 14 Feb 1996 23:57:51 GMT Message-ID: <4ftstv$p6q@hpscit.sc.hp.com> References: <4fiqeh$189@hpcvsnz.cv.hp.com> In article <4fiqeh$189@hpcvsnz.cv.hp.com>, Tom Bruhns wrote : >David A Willmore (willmore@whelk.cig.mot.com) wrote: >: It seems that every time I look for information on PLL loop filter design, >: they focus on simple implementation of the loop filter. Is it because >: simple one or two pole filters are the ideal filters for this use or >: is there some other design constraint involved? The filter only has to >: work in the audio range--from my understanding. Would a brick wall, low >: pass filter of a high order be a better solution? What if you could widen >: the passband while tuning and narrow it down once you have aquired lock? > >The problem is that the filter is part of a closed-loop feedback control >system. If you have unity gain and net 360 degrees phase shift in the >loop, you are going to have oscillations. Since high-order filters have >large phase shifts where their gain is still high, they aren't appropriate >for use in a closed loop. > >-- >Cheers, >Tom >tomb@lsid.hp.com Tom is of course right, but I did a study to determine how much filtering you could get away with before the loop oscillates. The best I came up with was to use an elliptic function filter (typically 5 or 7 poles) with a bandwidth about 10 to 20 times the loop bandwidth. If you obey that constraint, you will lose only a manageable amount of phase margin. The elliptic function filter is in addition to the normal second order lead lag filtering for the loop. It is important to use elliptic function filters, NOT all-pole filters such as Butterworth, Chebyshev, "Linear Phase", Bessel, etc. I have built many successful loops this way. Rick Karlquist N6RK rkarlqu@scd.hp.com From lwbyppp@epix.net Wed Feb 21 16:06:44 1996 Newsgroups: rec.radio.amateur.homebrew From: dstock@hpqmdla.sqf.hp.com (David Stockton) Subject: Re: PLL loop filter questions and idea Message-ID: Date: Fri, 16 Feb 1996 13:38:45 GMT References: David A Willmore (willmore@whelk.cig.mot.com) wrote: : Supposedly, the filters come in an eliptic variety which, I would think, : would not suffer from this much. Elliptics are even worse as you approach the 3db frequency. Check the group delay plots in Zverev. I've used elliptic filters in the tuning lines of phase-locked loops many times in the past, for special reasons, but the filter has to have its 3dB point at a much, much, higher frequency than the loop bandwidth to prevent the filter spoiling the loop response. Unless there is some special reason forcing high-order filters into a loop - which is more important than the compromised loop that results, avoid them like the plague. Straight forward RC networks with the loop amplifier are just about ideal, though a notch or two to kill the psd ref freq and its worst harmonics can be useful. : Hmmm, I'll have to give them a look. This design is for personal use, : BTW. I don't do these things for a career. :) I do. The loops with fancy filtering were specialised frequency summing loops and other loops used as tracking jitter demodulators - the filters controlled the jitter demodulation bandwidth, the loops were set for sub-Hertz bandwidths. Have a look at the end of chapter 14 in 1995 and 1996 ARRL handbooks for a run-down on a practical methodology for designing PLL characteristics. Cheers David GM4ZNX From lwbyppp@epix.net Wed Feb 21 16:06:45 1996 From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: Sun, 18 Feb 1996 13:22:56 -0800 Message-ID: References: All of us might want to check out the latest issue of COMMUNICATIONS QUARTERLY. There are quite a few VCO desgins therein and a number of PLL considerations worth reading.. 73 Cliff W6HDO On Sun, 18 Feb 1996, Eric M. Brombaugh wrote: > In article , willmore@whelk.cig.mot.com (David A > Willmore) wrote: > > > What if you could widen > > the passband while tuning and narrow it down once you have aquired lock? > > That's not a bad idea in some situations. Generally though, you want > the loop filter to be as wide as possible in order to track out the > inherent noise of your VCO. Sometimes you want to FM the VCO by adding > an audio signal to the output of the loop filter - then, a narrower loop > filter won't track out your FM signal. > > > Maxim has some nice eighth order switched capacitor filters which could > > easily fill this role. They are clocked at 100 times the highest passed > > frequency and are available in the three classic filter topoligies. It > > would be easy to put in a 1MHz clock with a 10x prescaler for a wide > > passband and then increase the prescaler value (eight bit counter) when > > the PLL has locked. Would this do what I think and decrease phase noise? > > Typically, the clock-feedthrough of a SCF will tend to cause nasty sidelobes > on your VCO unless you place additional RC filters in the circuit. > Essentially, the requirements for the loop filter are easy to achieve > with a simple 2nd order circuit. SCFs really don't add anything to the > performance. > > > Just a few thoughts and questions. BTW, anyone have a good VCO design for > > 60.7 to 64.7 MHz? :) > > You might want to check out Motorola App Note AN980 and the data sheet > for the MC3362 for some tips on such things. The MC3362 has a built-in > oscillator and varactor diode which work up to 180 MHz, and I have seen > 40m designs using it as well. > > -- > Eric Brombaugh KC7GXA > emeb@indirect.com (private) > ericb@sicom.com (work) > > From lwbyppp@epix.net Wed Feb 21 16:06:48 1996 From: emeb@indirect.com (Eric M. Brombaugh) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: Sun, 18 Feb 1996 11:46:22 -0700 Message-ID: References: In article , willmore@whelk.cig.mot.com (David A Willmore) wrote: > What if you could widen > the passband while tuning and narrow it down once you have aquired lock? That's not a bad idea in some situations. Generally though, you want the loop filter to be as wide as possible in order to track out the inherent noise of your VCO. Sometimes you want to FM the VCO by adding an audio signal to the output of the loop filter - then, a narrower loop filter won't track out your FM signal. > Maxim has some nice eighth order switched capacitor filters which could > easily fill this role. They are clocked at 100 times the highest passed > frequency and are available in the three classic filter topoligies. It > would be easy to put in a 1MHz clock with a 10x prescaler for a wide > passband and then increase the prescaler value (eight bit counter) when > the PLL has locked. Would this do what I think and decrease phase noise? Typically, the clock-feedthrough of a SCF will tend to cause nasty sidelobes on your VCO unless you place additional RC filters in the circuit. Essentially, the requirements for the loop filter are easy to achieve with a simple 2nd order circuit. SCFs really don't add anything to the performance. > Just a few thoughts and questions. BTW, anyone have a good VCO design for > 60.7 to 64.7 MHz? :) You might want to check out Motorola App Note AN980 and the data sheet for the MC3362 for some tips on such things. The MC3362 has a built-in oscillator and varactor diode which work up to 180 MHz, and I have seen 40m designs using it as well. -- Eric Brombaugh KC7GXA emeb@indirect.com (private) ericb@sicom.com (work) From lwbyppp@epix.net Wed Feb 21 16:06:49 1996 From: opworld@worldnet.fr Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: Mon, 19 Feb 1996 11:54:44 GMT Message-ID: <4g9oln$1oi@aldebaran.sct.fr> References: <4fj5uf$s9o@alterdial.UU.NET> Hi On same subject, is there a better filter after a PLL than the classical with opamp, 2 resistances and 2 capacitors ? Regards Have a nice opworld@worldnet.fr Day From lwbyppp@epix.net Wed Feb 21 16:06:50 1996 From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 15 Feb 1996 17:44:00 GMT Message-ID: <4fvrd0$et3@abyss.West.Sun.COM> References: <4fiqeh$189@hpcvsnz.cv.hp.com> <4ftstv$p6q@hpscit.sc.hp.com> In article <4ftstv$p6q@hpscit.sc.hp.com>, Richard Karlquist wrote: >In article <4fiqeh$189@hpcvsnz.cv.hp.com>, Tom Bruhns wrot e: >>David A Willmore (willmore@whelk.cig.mot.com) wrote: >>: It seems that every time I look for information on PLL loop filter design, >>: they focus on simple implementation of the loop filter. Is it because >>: simple one or two pole filters are the ideal filters for this use or >>: is there some other design constraint involved? The filter only has to >>: work in the audio range--from my understanding. Would a brick wall, low >>: pass filter of a high order be a better solution? What if you could widen >>: the passband while tuning and narrow it down once you have aquired lock? >> >>The problem is that the filter is part of a closed-loop feedback control >>system. If you have unity gain and net 360 degrees phase shift in the >>loop, you are going to have oscillations. Since high-order filters have >>large phase shifts where their gain is still high, they aren't appropriate >>for use in a closed loop. >> >>-- >>Cheers, >>Tom >>tomb@lsid.hp.com > >Tom is of course right, but I did a study to determine how much filtering >you could get away with before the loop oscillates. The best I came up >with was to use an elliptic function filter (typically 5 or 7 poles) with >a bandwidth about 10 to 20 times the loop bandwidth. If you obey that >constraint, you will lose only a manageable amount of phase margin. The >elliptic function filter is in addition to the normal second order lead >lag filtering for the loop. It is important to use elliptic function >filters, NOT all-pole filters such as Butterworth, Chebyshev, "Linear >Phase", Bessel, etc. I have built many successful loops this way. Why are you using this additional filter? - the only real issue I can think of is to reduce reference sideband level, the importance of which depends on the application. At the same time, the elliptic filter may become a significant source of noise if built with active devices, resulting in a trade-off between sideband suppression and phase noise content. -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Wed Feb 21 16:06:52 1996 From: datwyler@aros.net (Douglas L. Datwyler) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 19 Feb 1996 14:22:00 GMT Message-ID: <4ga128$r4@news.aros.net> References: <4flegc$56j@news.aladdin.co.uk> In article <4flegc$56j@news.aladdin.co.uk>, drassew2@aladdin.co.uk says... > >>Maxim has some nice eighth order switched capacitor filters which could >>easily fill this role. They are clocked at 100 times the highest passed >>frequency and are available in the three classic filter topoligies. It >>would be easy to put in a 1MHz clock with a 10x prescaler for a wide >>passband and then increase the prescaler value (eight bit counter) when >>the PLL has locked. Would this do what I think and decrease phase noise? > >PLL 'Filters' don't actually filter as such. They serve to set the >loop bandwidth and damping factors and as such only need one or two >poles. For basic loops there is nothing to be gained by going to >higher order filters. The PLL can only clean up phase noise closer to >the carrier than the loop bandwidth. Phase noise needs to be >minimised at start by using as wide a loop bandwidth as possible and a >VCO with an inherently good phase noise performance in its own right. > > >Don't even think of using switched capacitor filters in PLLs. There ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Better tell Linear Technologies Corp. Thieir Design Note 7 utilizes an LTC1062, a 5th order, switched-capacitor filter for the loop filter. The note shows the jitter of a standard RC filter in a CD4046 loop and a filter built with this part. THe jitter is down to internal jitter of VCO (Claimed). Douglas L. Datwyler WR7O datwyler@aros.net >could easily be horrible interactions between switching components and >loop frequencies! > >73 Andy G4JNT > From lwbyppp@epix.net Wed Feb 21 16:06:53 1996 Newsgroups: rec.radio.amateur.homebrew From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: PostScript to Gerber Message-ID: <1996Feb15.175043.13228@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) References: Date: Thu, 15 Feb 1996 17:50:43 GMT In article ae517@FreeNet.Carleton.CA (Russ Re naud) writes: > >Is there any shareware utility that will convert a ppostscript file >to Gerber format (for cad/cam), or a shareware cad app that will >read a postscript and output in Gerber? The folks in rec.crafts.metalworking are facing this same problem. I believe you'll find that unless the Postscript file uses only the basic line drawing primitives, information is lost and you won't be able to reconstruct a CAD file from the Postscript file. Postscript is a printer language, IE it describes a bitmap in terms of a set of descriptive primitives, and isn't generally a good geometric object language suitable for CAD. 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 lwbyppp@epix.net Wed Feb 21 16:06:54 1996 From: claude@bauv.unibw-muenchen.de (Claude Frantz) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PostScript to Gerber Date: 16 Feb 96 20:58:03 GMT Message-ID: References: <1996Feb15.175043.13228@ke4zv.atl.ga.us> Reply-To: claude@bauv106.bauv.unibw-muenchen.de gary@ke4zv.atl.ga.us (Gary Coffman) writes: >In article ae517@FreeNet.Carleton.CA (Russ R enaud) writes: >> >>Is there any shareware utility that will convert a ppostscript file >>to Gerber format (for cad/cam), or a shareware cad app that will >>read a postscript and output in Gerber? >The folks in rec.crafts.metalworking are facing this same problem. >I believe you'll find that unless the Postscript file uses only >the basic line drawing primitives, information is lost and you won't >be able to reconstruct a CAD file from the Postscript file. >Postscript is a printer language, IE it describes a bitmap in >terms of a set of descriptive primitives, and isn't generally >a good geometric object language suitable for CAD. Exactly speaking, PostScript is a programing language having a lot of language elements suitable for various tasks, but especially for graphics. There are language elements for bitmaps as well as for vectors, circles of fonts. Have a look on the PostScript FAQ. 73, -- Claude (claude@bauv106.bauv.unibw-muenchen.de) The opinions expressed above represent those of the writer and not necessarily those of her employer. From lwbyppp@epix.net Wed Feb 21 16:06:55 1996 From: JLAN98A@prodigy.com (Kenneth Burtchaell) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Printer generated transparency problem Date: 17 Feb 1996 20:51:04 GMT Distribution: world Message-ID: <4g5f3o$ne6@useneta1.news.prodigy.com> References: <4ep7jg$326k@useneta1.news.prodigy.com> <4f2lje$3vh@dub-news-svc-4.compuserve.com> <4g08g5$ls5@news1.goodnet.com> My printer controls darkness by software command.I use paintbrush for my pcbs as most the layouts are straight lines.Look up sci.electronics. basics for a recent article describing various toner transfer methods 73 Ken From lwbyppp@epix.net Wed Feb 21 16:06:57 1996 From: ecloud@goodguy (Shawn Rutledge) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Printer generated transparency problem Date: 15 Feb 1996 21:27:33 GMT Message-ID: <4g08g5$ls5@news1.goodnet.com> References: <4ep7jg$326k@useneta1.news.prodigy.com> <4f2lje$3vh@dub-news-svc-4.compuserve.com> ian white (100743.1026@compuserve.com) wrote: : JLAN98A@prodigy.com (Kenneth Burtchaell) wrote: : >I am experiecing difficulty in getting a good solid blackening in the : >solid trace areas of PCB layout transparencies on my Okidata OL400 : >printer.It has been suggested to me that this might be a electro static : >induced problem . Anybody have any good ideas? : > : > 73 Ken W6GHV : I have been trying to do the same with my KODAK lazer printer. : Generally it is black enough now I have set it darker from the slider : bar in printer setup options in windows 3.1. although the acetate film My Brother HL-8V (HPIII compatible, uses the Canon SX engine - paper tray in front, output on the top) has a knob inside to adjust "darkness" as well, and it really makes quite a difference (in output, I haven't tried making PC boards yet). If your printer looks similar to an HPIII it probably has this control as well. Open the printer as if you were going to change the toner cartridge, and the knob is on the front left corner of the open space. : I am using goes a bit crinckly through the heated rollers. : Have you any suggestions as to software for making PCB layouts? Corel Draw works nicely if you are doing it by hand, or if you have an old pattern not suitable form directly photocopying onto acetate, you can scan it, import it into Corel, and then draw the traces over top (trace the scanned version). When you're done tracing it, remove the bitmap from the background and you will have nice cleaned up artwork. The nice thing about Corel (as opposed to some generic CAD program) is the ease of doing curved lines, and making closed shapes which you can fill solid black. Alternatively, you could take the scanned version into Photoshop, tweak the brightness and contrast to get rid of smudges and inconsistency, use the line tool, paint brushes, etc. to clean up edges and light areas, and print that, but Photoshop would be one of the worst choices for creating a layout from scratch. If you're going to design a circuit, there are some schematic capture and PC board layout packages. I got Chipmunk and some other package, both for Linux, and they appear quite nice and easy to work with but I haven't done any real work with them yet. My conclusion after designing one board with a really ancient version of PCAD that I picked up at a hamfest is that doing a schematic first isn't worthwhile unless you need it for documentation, or can afford one of the nice ($1000+) design programs that has a worthwhile router. PCAD did such a lousy job routing that I ended up doing layout from scratch anyway, and mentally verifying the operatio n of the circuit based on the pc board layout rather than the schematic. -- _______ KB7PWD @ KC7Y.AZ.US.NOAM ecloud@goodnet.com (_ | |_) Shawn T. Rutledge on the web: http://www.goodnet.com/~ecloud __) | | \__________________________________________________________________ * PIC * alternative energy * packet * VRML * Star Trek * Khoros * X window * From lwbyppp@epix.net Wed Feb 21 16:06:58 1996 From: kmiller@airmail.net (Kerry W. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: QRP Schematics Date: Wed, 21 Feb 1996 12:29:29 GMT Message-ID: <4gf38m$gud@news-f.iadfw.net> Ok, I finally got them all finished. The schematics are at John Cunliffe's web page: http://www.frontiernet.net/~cunliffe If you have problems, drop me a note, I have all the original articles. Have fun! 73, Kerry Miller kmiller@airmail.net From lwbyppp@epix.net Wed Feb 21 16:06:58 1996 From: tomb@lsid.hp.com (Tom Bruhns) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Safe mains voltage connector. Date: 16 Feb 1996 17:26:55 GMT Message-ID: <4g2eov$9h0@hpcvsnz.cv.hp.com> References: <1996Feb16.155326.29752@ucl.ac.uk> Dave Kirkby (davek@medphys.ucl.ac.uk) wrote: : I have a need for a connector to handle 240 VAC @ 30 A. Nothing unusal you t hink. The : problem is, that either side (plug or socket) of the connector may be live. Has that : exhaused all possibilities, or does something exits that works safely ?????? I haven't had any experience with them, but what about the connectors that are designed to be connected/disconnected underwater? I'd guess they may do a good job protecting both the "plug" and the "socket" ends from contact. -- Cheers, Tom tomb@lsid.hp.com From lwbyppp@epix.net Wed Feb 21 16:06:59 1996 From: Barry Newberger Newsgroups: rec.radio.amateur.homebrew Subject: Spec for AMD ID8031AH MCU Date: 18 Feb 1996 06:57:47 GMT Distribution: world Message-ID: <4g6ilb$jkn@geraldo.cc.utexas.edu> Can someone tell me what package and operating temperature range the prefix ID denotes on the subject line microcontroller. Thanks, Barry Newberger W5KH From lwbyppp@epix.net Wed Feb 21 16:07:00 1996 From: rondoc@west.net (Ronald Doctors) Newsgroups: rec.radio.amateur.homebrew Subject: TEK SCOPES 4 SALE Date: Fri, 16 Feb 96 22:05:33 GMT Message-ID: <4g2v3d$hnc_001@sb.west.net> GOT a 585 witha type 82 this is a 1.5 nanosec rise time scope and also a 535A with a CA plugin. I'll take the best offer recievd in the next 30 days. I am in Santa Barbar CA shipping OK freight prepaid or UPS. From lwbyppp@epix.net Wed Feb 21 16:07:01 1996 From: amman@airmail.net (McCarthy) Newsgroups: rec.radio.amateur.homebrew Subject: Tubes Date: Sun, 18 Feb 1996 05:35:57 GMT Message-ID: <4g66rh$65r@news-f.iadfw.net> Need 2 tubes: 12BY7A S2001 or 6146B Thanks Robert KC5RYI amman@airmail.net From lwbyppp@epix.net Wed Feb 21 16:07:02 1996 From: Geert.Pirens@ping.be (Geert Pirens) Newsgroups: rec.radio.amateur.homebrew Subject: Want to made myself a SWR and Milli Watt meter. Date: Sat, 17 Feb 1996 00:44:37 GMT Message-ID: <4g38cu$nif@ping1.ping.be> Hello Can somebody help me on this ? I want to make myself a SWR and Power meter for the 2M and 70cm. If you have some Schematic diagrams or PCB layouts ? Plaese let me now ALL INFORMATION IS WELKOM 73! Geert, ONL2057 From lwbyppp@epix.net Wed Feb 21 16:07:03 1996 From: ONL2057@amsat.org (Geert Pirens) Newsgroups: rec.radio.amateur.homebrew Subject: Wanted schematic diagram of SWR and power meters. who can help ? Date: Sat, 17 Feb 1996 00:47:03 GMT Message-ID: <4g38hh$nif@ping1.ping.be> Reply-To: ONL2057@amsat.org Hello Can somebody help me on this ? I want to make myself a SWR and Power meter for the 2M and 70cm. If you have some Schematic diagrams or PCB layouts ? Plaese let me now ALL INFORMATION IS WELKOM 73! Geert, ONL2057 From lwbyppp@epix.net Wed Feb 21 16:07:04 1996 From: kmiller@airmail.net (Kerry W. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WTB 6,000 watt linear amp 75 meters Date: Sun, 18 Feb 1996 23:47:18 GMT Message-ID: <4g8dri$hac@news-f.iadfw.net> References: <4g2jqm$huc@solaris.cc.vt.edu> Mars@dum.edu wrote: > Please forward info. If you can find an old Alpha 77 2-holer, it will do it. I saw a guy do 8kw before he started a fire at the base of the tower. Guess the shunt feed for 160 wasn't up to it! Too much hassle to run that much pwr. 73, Kerry WD5ABC PS It's a hassle, but he was S9+40 in Europe! From lwbyppp@epix.net Wed Feb 21 16:07:05 1996 From: mulveyr@ll.aa2ys.ampr.org (Rich Mulvey) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WTB 6,000 watt linear amp 75 meters Date: 18 Feb 1996 16:15:47 GMT Message-ID: References: <4g6vfl$m8e@newsbf02.news.aol.com> Reply-To: mulveyr@vivanet.com On Sun, 18 Feb 1996 08:33:06 -0400, sco@sco-inc.com wrote: >In article <4g6vfl$m8e@newsbf02.news.aol.com> w8jitom@aol.com (W8JI Tom) wri tes: >>From: w8jitom@aol.com (W8JI Tom) >>Subject: Re: WTB 6,000 watt linear amp 75 meters >>Date: 18 Feb 1996 05:36:37 -0500 > >I thought 1500w was the legal limit? It's a troll, son. :-) --- Rich Mulvey, aa2ys Rochester, NY USA mulveyr@vivanet.com aa2ys@net.wb2psi.ampr.org aa2ys@wb2psi.#wny.ny.us From lwbyppp@epix.net Wed Feb 21 16:07:05 1996 From: sco@sco-inc.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: WTB 6,000 watt linear amp 75 meters Date: Sun, 18 Feb 1996 08:33:06 -0400 Message-ID: References: <4g6vfl$m8e@newsbf02.news.aol.com> In article <4g6vfl$m8e@newsbf02.news.aol.com> w8jitom@aol.com (W8JI Tom) writ es: >From: w8jitom@aol.com (W8JI Tom) >Subject: Re: WTB 6,000 watt linear amp 75 meters >Date: 18 Feb 1996 05:36:37 -0500 I thought 1500w was the legal limit? From lwbyppp@epix.net Wed Feb 21 16:07:07 1996 From: kmiller@airmail.net (Kerry W. Miller) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WTB 6,000 watt linear amp 75 meters Date: Mon, 19 Feb 1996 23:07:44 GMT Message-ID: <4gavt8$j7a@news-f.iadfw.net> References: <4g8dri$hac@news-f.iadfw.net> <4g9p8k$l1b@newsbf02.news.aol.com> w8jitom@aol.com (W8JI Tom) wrote: >In article <4g8dri$hac@news-f.iadfw.net>, kmiller@airmail.net (Kerry W. >Miller) writes: >> >>If you can find an old Alpha 77 2-holer, it will do it. I saw a guy >>do 8kw before he started a fire at the base of the tower. Guess the >>shunt feed for 160 wasn't up to it! Too much hassle to run that much >>pwr. >>73, >>Kerry >No offense Kerry, but that must have been a VERY special 77 two holer or >the guy was BS'ing you. For example, I can find a lot of old Pontiac GTO >owners that claim their cars run 11's! ;-) If that ETO was really doing >8 k out, the fire would have been in the amplifier! Maybe with the >feedpoint arcing the meter said 8 kW, but 4 or 5 kW of it must have been >reflected power! > >77 two holers only run around 3-4 kW out (even with the bigger >transformer)! 160 is one of the worst bands, where they only do around 3 >kW or so out. Even at that power, the HV is down from 4000 volts no load >to 3 kV!!!! >The plate choke is too small and the tank is too inefficient on 160, there >is no input matching (just a parallel L/C circuit), and the power supply >is WAY too weak. Even if you fixed all of that, the grids of the 8877's >would pop like last week's Mexican dinner if each 8877 was pushed past 3 >kW. With a big external plate supply and a big exciter a 77 owner is VERY >lucky to see 5 kW out. >It takes a lot more than a tiny little girly whimp like an 8877 (or a even >a pair of those little sissies) to do 8 kW! It takes a man sized amp with >some real hair under it's arms. >73 Tom. Tom, Hi! It really will do it, but not for long. The 8kw was on a PEP meter, not a "real" meter. The 8877 won't last long at that rate, but this guy has more money than sense anyway. He has a wall full of OO cards, collects them like QSLs! 73, Kerry PS Yep, he's full of it, but I saw the meter this time, I thought he was lying too, had to go see it. Does that make me an accessory? From lwbyppp@epix.net Wed Feb 21 16:07:08 1996 From: wave@mindspring.com (Pieter Ibelings) Newsgroups: rec.radio.amateur.homebrew Subject: Re: WTB 6,000 watt linear amp 75 meters Date: 18 Feb 1996 15:41:56 GMT Message-ID: <4g7hc4$pt6@brickbat.mindspring.com> References: <4g6vfl$m8e@newsbf02.news.aol.com> 'In article <4g6vfl$m8e@newsbf02.news.aol.com> w8jitom@aol.com (W8JI Tom) 'writes: 'From: w8jitom@aol.com (W8JI Tom) 'Subject: Re: WTB 6,000 watt linear amp 75 meters 'Date: 18 Feb 1996 05:36:37 -0500 'I thought 1500w was the legal limit? 1500W is the legal limit, But what if he want's to run 1500W at reduced IMD. From lwbyppp@epix.net Wed Feb 21 16:07:08 1996 From: kk5dr@bga.com Newsgroups: rec.radio.amateur.homebrew Subject: WTB HP5082-2900 diodes (not from I.R.&C.) Date: 17 Feb 1996 20:39:48 GMT Message-ID: <4g5eek$nep@giga.bga.com> I need 4 to 8 of these diodes,but I don't want to pay more than $4 each. From lwbyppp@epix.net Wed Feb 21 16:07:09 1996 From: Russ Newsgroups: rec.radio.swap,rec.radio.amateur.homebrew Subject: WTB, H.D. Bandswitch Date: Fri, 16 Feb 1996 13:55:59 -0700 Message-ID: <3124EF5F.3073@cyberhighway.net> Reply-To: russcwv@cyberhighway.net I am building a 4-1000A Amp and almost have the Power Supply done, 5000 volts at .5 Amps plus. The RF deck is being laid out now and I realize the Bandswitch I was going to use won't cut it at a 6000 ohm plate impedance. Looking for 4-6 positions SPDT OK for simple Pi net. Anyone have a spare switch for my beast?? Russ, WA6CWV, Boise Idaho From lwbyppp@epix.net Wed Feb 21 16:07:10 1996 From: Roland S Geter PhD Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap Subject: Re: WTB:5KW AM Transmitter Date: 17 Feb 1996 07:58:55 GMT Message-ID: <4g41rv$ica@news1.goodnet.com> References: <4fn47d$j76@www.acay.com.au> To: spiroe@acay.com.au What are you going to do with it? Roland S Geter PhD Internet: roland@mycronet.com Packer: WB6LNA@kc7y.az.usa.noam From lwbyppp@epix.net Wed Feb 21 16:07:11 1996 From: Roland S Geter PhD Newsgroups: aus.radio.amateur.misc,aus.radio.amateur.wicen,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.scanner,rec.radio.swap Subject: Re: WTB:5KW AM Transmitter Date: 17 Feb 1996 07:57:37 GMT Message-ID: <4g41pi$ica@news1.goodnet.com> References: <4fn47d$j76@www.acay.com.au> To: spiro,evagelakos What are you going to do with it? Roland S Geter PhD Internet: roland@mycronet.com Packer: WB6LNA@kc7y.az.usa.noam From lwbyppp@epix.net Tue Feb 27 20:09:38 1996 Newsgroups: rec.radio.amateur.homebrew From: Helmut Strickner Subject: Re: ### KISS on a Baycom? Message-ID: Date: Thu, 22 Feb 1996 00:14:20 GMT To: edwint@greenie.com References: <312852fb.1d2@greenie.com> <312a704e.181@greenie.com> edwint@greenie.com (Edwin Teh) wrote: >In article , Helmut Strickner writes: > >> There are a number of KISS drivers around for the Baycom - style modem. > >> TFPCX >> TFX >> probably some more that I dont recall off the top of my head. > >> For NOS use AX25.COM from Pawel Jalocha. > >Thanks for your helpful infomation - but I'm to understand baycom >style modems don't work on unix(and it's varients) based systems >due to the way they operate. > >I haven't seen any KISS drivers for the Baycom for unix. > >73 de 9V1ZY > >-- >EdwinT@greenie.com -[ Standard Disclaimers Apply ]- > > Now Faith is a substance of things hoped for, > the evidence of things not seen. [Heb 11:1] > > As Email can be altered electronically, > the integrity of this communication is not guaranteed. > >ÿ > Hi Edwin, You did not mention in your first posting that you want to use the Baycom modem on a *NIX system. Of course the ax25.com driver can only be used under DOS. It takes quite a bit of CPU power to use the driver due to its function of bit timing etc. There is possibly a driver for Baycom modem out there which runs under LINUX but I dont know. Your best bet is to put a posting in the .linux newsgroups. What is your reason to run TCP/IP on a UNIX platform, there is a lot of programmes available which run on DOS and can do all you need. If you need a unix platform and want to use the Baycom modem why dont you use a low cost PC 286/386 as front end and network it to your unix machine using TCP/IP? To get more response I would also suggest to use the more appropriate newsgroup rec.radio.amateur.digital.misc, there are far more people with the knowledge required to help you reading your postings. Most computer guys are not really "into" homebrew. 73 de Helmut VK4STR From lwbyppp@epix.net Tue Feb 27 20:09:39 1996 From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 'Memory keyer - Public domain code' Date: 20 Feb 1996 08:29:12 GMT Message-ID: <4gc0oo$4ql@abyss.West.Sun.COM> References: <4fvojr$1fp@baleen.fore.com> In article , Jay Wicklund wrote: > >In article <4fvojr$1fp@baleen.fore.com>, writes: > >> Well... I pose an idea... >> >> Pool a list of desired features, get a group of geeks together via >> internet, and group write and post the source code, and design and >> build a public domain keyer... and then make a group article for QST >> >> Sound plausable, or am I asking for a democracy in the land of >> chaos? > >Hi Ed, sounds like an interesting project, and maybe something like >this might get this group doing more that talking (spice things up a >little). Its been getting a little boring here, and it is a homebrew >group. > >As for the processor, what is the power requirements of the HC11? I >would think you would want to keep the power low, and would also think >that the 6805 family might have some lower powered versions available. >If I remember right, some of that family can also program themselves >by a simple connection to a PROM. Look for the lowest cost part with decent availability, not someone's favorite processor. The Atmel 89C2051 is a 20 pin 8051 processor with 1 or 2 K of on-chip EEPROM. The PIC processors come in a dozen different flavors. We really can't tell without doing more of a feature/cost brainstorm session, but HC11 or 68HC05 or 80C51 might be overkill in power and cost. I believe it is Wayne Burdick that already supplies a memory keyer in a PIC for a QRP kit.... maybe he'd make a variant of the source code PD? -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Tue Feb 27 20:09:40 1996 From: Tfugate@pop.uky.edu (Terry Fugate) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 15pin video, want to use old monitor Date: 26 Feb 1996 12:58:57 GMT Message-ID: <4gsaqh$nqm@service2.uky.edu> References: <4gnt6c$jip@cloner2.ix.netcom.com> In article <4gnt6c$jip@cloner2.ix.netcom.com>, timhynde@ix.netcom.com(Tim Hynd e ka8ddz/qrp Rochester, MI) says: > > > I've got an old laptop (386) Im going to dedicate to the ham shack, >mostly to run Hamcomm, Baycomm, and perhaps JVFAX. It has a 15 pin >output for a VGA monitor, since everything I'm running is CGA and even >then, mostly text based I want to use an amber monitor pulled out of a >terminal. As best I can tell there are 3 inputs to the monitor for >horz,vert, and video. (I may not have those terms correct but I know >they are the minimum nessesary) I've successfully connected it to an >old Sinclair Z-80, but dont want to blow the video out of the laptop. > >Any suggestions on which pins will provide the nessesary signals. I'm >just not up on the types of signals comming from the 15 pin video out. > >Thanks for any and all input. > >73, Tim >ka8ddz LAter today I will try to Email the VGA pinout for a HD(high density)DB15. Sadly, you are going to run into e problem that stoped me when I was given an IBM PS1. VGA horizontal starts out at about twice the horizontal of CGA. CGA is 15750HZ and VGA is 31,500Hz. Then there is the fun of vertical. CGA is 60.0Hz, while VGA runs from 60 to 70 hz, with the sync polarity changing again depending on mode. Super VGA has the same pin out as VGA, but, H freq runs from 35,370 up to as high as 60,800. I am a TV Engineer and aster frying several CGA(actually monochrome green and ambers)monitors, I just gave up an scrounged up a VGA monitor. Good Luck The figures I quated are from a 'PC Hardware' handbook, in the subsection on Video Standards. I have seen slightly different figures in some IBM documentation once, but, if memory serves correctly, they all are withen a few percent of each other. up to From lwbyppp@epix.net Tue Feb 27 20:09:41 1996 From: dll@chattanooga.net (David Lawson) Newsgroups: rec.radio.amateur.homebrew Subject: 49 mhz to 6 meter conversion Date: 23 Feb 1996 08:09:34 GMT Message-ID: <4gjsnu$3ec@news.chattanooga.net> I have recently read an article in the Boston Amateur radio club archives about converting a 1 channel 49 mhz radio shack walkie talkie to a 6 meter tranciever with a 1 repeater coverage. Does anyone know why this shouldnt work with a simple crystal change? Has anyone done it? It might become my next project. David Lawson KF4EBP From lwbyppp@epix.net Tue Feb 27 20:09:42 1996 From: mgarrett@prairienet.org (Mark A. Garrett) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 49 mhz to 6 meter conversion Date: 23 Feb 1996 17:39:33 GMT Message-ID: <4gku4l$g3g@vixen.cso.uiuc.edu> References: <4gjsnu$3ec@news.chattanooga.net> Reply-To: mgarrett@prairienet.org (Mark A. Garrett) In a previous article, dll@chattanooga.net (David Lawson) says: >I have recently read an article in the Boston Amateur radio club archives >about converting a 1 channel 49 mhz radio shack walkie talkie to a 6 meter >tranciever with a 1 repeater coverage. Does anyone know why this shouldnt >work with a simple crystal change? Has anyone done it? It might become my >next project. > >David Lawson >KF4EBP > I have done it. It is really quite simple to change over the 1 channel units that are crystal controlled. If you order crystals order wire leads so that you can lay over the transmitter cystal over on the board (if you use the hc18 style and mount it vertical you will not get the case closed) Tuneup is straighforward. You might want to add a small pot to the fixed resistor squelch circuit to loosen up the squelch and come up with another type of antenna (at 50mw you still have only a 1/4 mile range tops with the antennas on these units. A decent antenna or beam can really help out on range).> -- Mark Garrett mgarrett@prairienet.org KA9SZX @ N9LNQ.#ECIL.IL.USA.NOAM From lwbyppp@epix.net Tue Feb 27 20:09:43 1996 From: "Ian White, G3SEK" Newsgroups: rec.radio.amateur.homebrew Subject: Re: ? transverter 10m-70cm Date: Fri, 23 Feb 1996 14:36:36 +0000 Distribution: world Message-ID: References: <4fsn2a$93b@rznews.rrze.uni-erlangen.de> In article <4gju1n$7qs@cmir.arnes.si>, wrote: >hsreiser@cip.informatik.uni-erlangen.de (Hans Reiser (CIP 95)) wrote: > >>Hello! > >>I intend to build a transverter 10m<->70cm (maybe also 10m-23cm), and >>i'm looking for any information about this. Any hints how to do >>so would be appreciated, as well as sources for schematics, literatur, >>etc, and personal experiences with this. >>One additional intended use of my project is in digital communication, >>and therefor I'm especially interested in the capability of >>full-duplex operation (simultanious TX and RX), and fast (electronic) >>TX/RX switching. And of course I'm interested also in >>low-budget-designs... :-) > >>Thanks for your replies. > >> Hansi. > >>----- >>Hansi Reiser, dl9rdz >> WWW-URL: >> packet radio: > >73, >The 70 cm - 10m transverter named DX'ers transverter for 432 Mhz with >good performance IP3, sensitivity... g4hgt design has been published >in 'THE VHF/UHF DX BOOK' (g3sek Ian White - editor) , published by DIR >PUBLISHING LTD, p.box 771, Buckingham MK18 4HH, England > Wait... there may be a better design coming up soon in the DUBUS magazine. The G4HGT design works well but is not easy to get going - mostly because of the difficulty in preventing Norton amplifiers from oscillating. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) Professionally: IFW Technical Services Clear technical English - anywhere. From lwbyppp@epix.net Tue Feb 27 20:09:44 1996 From: pavel.reberc@guest.arnes.si Newsgroups: rec.radio.amateur.homebrew Subject: Re: ? transverter 10m-70cm Date: Fri, 23 Feb 1996 17:28:03 GMT Message-ID: <4gju1n$7qs@cmir.arnes.si> References: <4fsn2a$93b@rznews.rrze.uni-erlangen.de> hsreiser@cip.informatik.uni-erlangen.de (Hans Reiser (CIP 95)) wrote: >Hello! >I intend to build a transverter 10m<->70cm (maybe also 10m-23cm), and >i'm looking for any information about this. Any hints how to do >so would be appreciated, as well as sources for schematics, literatur, >etc, and personal experiences with this. >One additional intended use of my project is in digital communication, >and therefor I'm especially interested in the capability of >full-duplex operation (simultanious TX and RX), and fast (electronic) >TX/RX switching. And of course I'm interested also in >low-budget-designs... :-) >Thanks for your replies. > Hansi. >----- >Hansi Reiser, dl9rdz > WWW-URL: > packet radio: 73, The 70 cm - 10m transverter named DX'ers transverter for 432 Mhz with good performance IP3, sensitivity... g4hgt design has been published in 'THE VHF/UHF DX BOOK' (g3sek Ian White - editor) , published by DIR PUBLISHING LTD, p.box 771, Buckingham MK18 4HH, England GL, de Pavel Reberc, S57RA, pavel.reberc@guest.arnes.si From lwbyppp@epix.net Tue Feb 27 20:09:45 1996 From: zaax@aol.com (ZaaX) Newsgroups: rec.radio.amateur.homebrew Subject: Are Ten-Tec Transverters Any Good? Date: 20 Feb 1996 03:58:57 -0500 Message-ID: <4gc2gh$i9s@newsbf02.news.aol.com> Reply-To: zaax@aol.com (ZaaX) I would like to hear from anyone that has built a Ten-Tec 6 metre transverter. How good is the receiver? Would you build one again? Any impressions would be most welcome! 73 Zack Schindler N8FNR From lwbyppp@epix.net Tue Feb 27 20:09:46 1996 From: pauls90212@aol.com (PaulS90212) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Are Ten-Tec Transverters Any Good? Date: 22 Feb 1996 01:39:28 -0500 Message-ID: <4gh330$k5@newsbf02.news.aol.com> References: <4gcro2$sj4@e-tex.com> Reply-To: pauls90212@aol.com (PaulS90212) I have worked a number of hams using the Ten-Tec transverters. They all sounded quite good and the owners really liked them. - Paul, N6DN From lwbyppp@epix.net Tue Feb 27 20:09:47 1996 From: Francis Lyn Newsgroups: rec.radio.amateur.homebrew Subject: Re: Are Ten-Tec Transverters Any Good? Date: 22 Feb 1996 12:52:03 GMT Message-ID: <4ghotj$72m@shpk1.candu.aecl.ca> References: <4gc2gh$i9s@newsbf02.news.aol.com> <4gcro2$sj4@e-tex.com> A friend and myself both built up the TenTec 6 m transverter last year. It's a well designed piece of gear that performs exceptionally well. It is complete, well documented, and not hard to put together. I use mine with a Kenwood TS50 to get on to the new 6 m repeater just put in service by the local club. This transverter is exceptional in that it has everything necessary built in; input attenuator, T/R switch, and 3 connectors for the antennas/rig. No messing about with T/R switching signals from the rig. The only small gripe I have is that the PCB board could have been of a higher quality, but hey, what do you expect for a kit costing $100! Technically, the PCB board supplied does the job just as well as a an epoxy-glass board would. 73 Francis Lyn, VE3TDL. From lwbyppp@epix.net Tue Feb 27 20:09:48 1996 From: eighmy@scott.net Newsgroups: rec.radio.amateur.homebrew Subject: Re: Are Ten-Tec Transverters Any Good? Date: 22 Feb 1996 17:49:07 GMT Message-ID: <4giaaj$71q@news.scott.net> Reply-To: eighmy@scott.net Keywords: TenTec 6meter Best $95 I've ever spent on radio gear!!!!!!!!!! Gene, wd4mps Birmingham, AL EM-63 From lwbyppp@epix.net Tue Feb 27 20:09:49 1996 From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Re: building a packet interface Date: Tue, 20 Feb 1996 10:32:13 -0700 Message-ID: <312A059D.75C8@lanl.gov> References: <4g822s$1h8@infoserver.bgsu.edu> <4gas0d$6o5@ixnews3.ix.netcom.com> To: Glenn Sparks Over 50% of PC's will work with an unmodified Digicom (the actual name for the German TNC-emulator for the Commodore series) modem, all you have to do is wire in a serial connector that fits your PC, and Baycom software for your PC. For a schematic of the necessary connections you can view my web page listed in my signature, page down until you get to the packet radio links. -- |-------------------------------------------------------| |Jim Devenport WB5AOX | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |HTTP://nis-www.lanl.gov/~jdport/ | |-------------------------------------------------------| From lwbyppp@epix.net Tue Feb 27 20:09:50 1996 From: gsparks@ix.netcom.com(Glenn Sparks) Newsgroups: rec.radio.amateur.homebrew Subject: Re: building a packet interface Date: 19 Feb 1996 22:01:49 GMT Message-ID: <4gas0d$6o5@ixnews3.ix.netcom.com> References: <4g822s$1h8@infoserver.bgsu.edu> You can get Baycom software for the IBM pc also. It is on the QRZ CDrom, and I would suspect on their home page also. I think the schematics for the modem are in the documentation, if not it is probably just a matter of putting in a RS-232 driver chip In <4g822s$1h8@infoserver.bgsu.edu> dicken@bgnet.bgsu.edu (Chuck Dicken,314 Hayes Hall,3727757,) writes: > > >Ill reference Feb 1996 73 magazine, article "Basic Packet Modem". > Doesn't seem to difficult to replicate and the price sure beats >whats available commercially. (if all you want is the BASIC packet). > >Sometime ago, I built a baycom for my C-64. The questions I have, > >1. Can this C-64 baycom interface be modified to run on an IBM? > >2. If it can be changed, what software could be used (Procomm > perhaps)? > >3. Has anyone sucessfully done what I am looking for? > > Thanks for stopping and looking in. > 73's Chuck > > >-- >Ham Call WD8ICP / / / >Internet dicken@bgsuvax.bgsu.edu / / / >Telephone (419) 372 7757 /______/________/ > / / | / From lwbyppp@epix.net Tue Feb 27 20:09:51 1996 From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Re: building a packet interface Date: Thu, 22 Feb 1996 09:22:59 -0700 Message-ID: <312C9863.5133@lanl.gov> References: <4gd8ie$ns6@kiwi.crown.net> <4gfamb$bh2@superb.csc.ti.com> To: Lyle Murphy BAYCOM refers to software that allows a PC to be used as a Terminal Node Controller (TNC) for packet radio communications. All functions except tone-to-digital (modem) functions take place inside the computer itself, thus requiring a relatively simple and inexpensive modem to interface the radio to the PC. This software was originally developed by the German authors for the Commodore 64/128 machines which was called Digicom. -- |-------------------------------------------------------| |Jim Devenport WB5AOX | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |HTTP://nis-www.lanl.gov/~jdport/ | |-------------------------------------------------------| From lwbyppp@epix.net Tue Feb 27 20:09:52 1996 From: elendir@enst.fr (Elendir) Newsgroups: rec.radio.amateur.homebrew Subject: Comb and interdigital filters for diplexers Date: 22 Feb 1996 12:37:35 GMT Message-ID: <4gho2f$51t@tempo.univ-lyon1.fr> Hi, do you think that a diplexer such as : - Having less than 1 dB of insertion loss at 1297 MHz. - Having more than 80 dB of attenuation at 1291 MHz can be built using "standard" (not microstrip, but with rods) comb or interdigital filters ? A cavity filter costs more than $750, it's too expensive for me. THX et 73 Vincent -- F5RCS - Worldwide Friendship through Amateur Radio ENST, Ecole Nationale Superieure des Telecommunications, Paris From lwbyppp@epix.net Tue Feb 27 20:09:54 1996 From: elendir@enst.fr (Elendir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Comb and interdigital filters for diplexers Date: 24 Feb 1996 20:22:01 GMT Message-ID: <4gns19$cbi@tempo.univ-lyon1.fr> References: <4gho2f$51t@tempo.univ-lyon1.fr> <4gl0m6$4dm@canyon.sr.hp.com> Glenn Elmore (glenne@sr.hp.com) wrote: : Q of the resonator. However, I agree with the other response that : simultaneously achieving low insertion loss and high stopband that close : is going to be a challenge for this kind of implementation. I barely have the choice. I cannot place a pre-amp before the filter, and any loss will affect the noise figure. And outputing 10 W... : If I were trying to do it, I think I'd investigate inexpensive ways to : make the highest Q resonator I could, almost certainly a copper or : silver cavity of some kind. Once determined, I'd see how many of them : it would take to get the required performance. I have done it. 3 should do the job (3 cavities). But the Q of a single rod cannot reach 1000 ? : Having some machining capability will no doubt help here. We have a machine (sorry, the English name is unknown to me !) - it's called a "tour" in French. The diplexer should be used for a repeater. It would perhaps be the first 23 cm repeater in France, and it would be multimode (FM, BLU). : If you are interested in a lesser filter, I'd be happy to supply the : design of a ~.5 dB IL, ~30 MHz wide interdigital filter I've built. : They're easy to fabricate, cheap and perform well, though not even close : to what you are asking for. It won't help me for the diplexer, but it may be useful at other stages of the repeater (especially after the final up-mixer). Thanx ES 73 :-) Vince, F5RCS From lwbyppp@epix.net Tue Feb 27 20:09:57 1996 From: glenne@sr.hp.com (Glenn Elmore) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Comb and interdigital filters for diplexers Date: 23 Feb 1996 18:23:02 GMT Message-ID: <4gl0m6$4dm@canyon.sr.hp.com> References: <4gho2f$51t@tempo.univ-lyon1.fr> Elendir (elendir@enst.fr) wrote: : do you think that a diplexer such as : : - Having less than 1 dB of insertion loss at 1297 MHz. : - Having more than 80 dB of attenuation at 1291 MHz : can be built using "standard" (not microstrip, but with rods) comb or : interdigital filters ? : A cavity filter costs more than $750, it's too expensive for me. I have designed and built interdigital filters using ~10 mm diameter brass rods in copper boxes with various numbers of sections. These work very well, give stable and repeatable performance due to the basic high Q of the resonator. However, I agree with the other response that simultaneously achieving low insertion loss and high stopband that close is going to be a challenge for this kind of implementation. I suspect that to get that kind of performance you'll find yourself with larger volume structures or at least a lot more elements. It may start to look a lot like the $750 implementation you mention. If I were trying to do it, I think I'd investigate inexpensive ways to make the highest Q resonator I could, almost certainly a copper or silver cavity of some kind. Once determined, I'd see how many of them it would take to get the required performance. Having some machining capability will no doubt help here. If you are interested in a lesser filter, I'd be happy to supply the design of a ~.5 dB IL, ~30 MHz wide interdigital filter I've built. They're easy to fabricate, cheap and perform well, though not even close to what you are asking for. 73 Glenn Elmore n6gn amateur IP: glenn@SantaRosa.ampr.org Internet: glenne@sr.hp.com |--------------- N6GN's Higher Speed Packet WWW Page -------------------| | | | ftp://col.hp.com/hamradio/packet/n6gn/index.html | | | |-----------------------------------------------------------------------| From lwbyppp@epix.net Tue Feb 27 20:09:58 1996 From: Gareth Edwards Newsgroups: rec.radio.amateur.homebrew Subject: Re: Comb and interdigital filters for diplexers Date: Fri, 23 Feb 96 14:37:26 GMT Message-ID: <825086246snz@darkblue.demon.co.uk> References: <4gho2f$51t@tempo.univ-lyon1.fr> Reply-To: Gareth@darkblue.demon.co.uk In article <4gho2f$51t@tempo.univ-lyon1.fr> elendir@enst.fr "Elendir" writes: > Hi, > do you think that a diplexer such as : > > - Having less than 1 dB of insertion loss at 1297 MHz. > - Having more than 80 dB of attenuation at 1291 MHz > > can be built using "standard" (not microstrip, but with rods) comb or > interdigital filters ? > > A cavity filter costs more than $750, it's too expensive for me. > > THX et 73 > Vincent > > -- > F5RCS - Worldwide Friendship through Amateur Radio > ENST, Ecole Nationale Superieure des Telecommunications, Paris > Vincent, I'm a filter engineer by trade, and this sounds like a tough job. I presume there is a passband required and a stop band required, rather than just two spot frequencies. If this is the case, then I don't think an all pole Chebyshev would be up to the job; you'd probably need a ridiculous number of poles and resonators about half a metre across. For comparison, we cellular guys have a passband requirement of <1dB from 880-915MHz, > about 60dB attenuation 925-960MHz, and usually use 7 or 8 poles and a couple of finite frequency zeros a la elliptic filter to do the job. Tough to design and tune if you don't have either a) a deep understanding of filter theory or b) lots of brute force computing power and a very good optimiser. In short, not the kind of spec *I* would look forward to, and I get paid for this. I know this doesn't help, but I just thought I'd throw in the professional perspective. Cheers, Gareth. -- I don't want the world; I just want your half. - TMBG ------------------------------------------------------------------ | Gareth Edwards | Gareth@darkblue.demon.co.uk | | Edinburgh, | Home of Edinburgh Beige Cricket Club | | Scotland | PGP public key available on request | ------------------------------------------------------------------ From lwbyppp@epix.net Tue Feb 27 20:10:00 1996 Newsgroups: rec.radio.amateur.homebrew From: rohrwerk@netcom.com (John Seboldt) Subject: DigiBrain Spur/Noise Elimination? Message-ID: Date: Sat, 24 Feb 1996 04:50:43 GMT March QST's refinement of the DigiVFO (adding a microprocessor and "knob" tuning with display) looks wonderful. It raises, of course, the same question I had about the original: additional circuitry needed to "clean up" the output to avoid spurs on receive. (Spurs at only 70 dB down can mean lots of receive birdies!) I'd love to apply it to my R2 setup, but not at the price of tons of spurs and noise! A good PLL is of course the obvious solution... but I wonder... I am using a 74HC240 buffer to generate square wave drive for my system... similar to the buffer of the "remote VFO" project a while back. Would this tend to take care of those spurs and noise, the chips responding only to the main (strongest) signal in shaping the square wave? : John Seboldt rohrwerk@netcom.com / CW: It don't mean a thing : K0JD... Minneapolis, MN / if it ain't got that swing! : My R2/T2 station described in / Di dah, di dah, di dah, di dah... From lwbyppp@epix.net Tue Feb 27 20:10:01 1996 From: mishmash@anv.net (Charles J. Mishmash) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Re: DS-1A (DC-DC converter for Kenwood) question Date: 24 Feb 1996 16:23:02 GMT Message-ID: <4gne16$b5r@bighorn.accessnv.com> References: <4ft09j$ias@crchh327.rich.bnr.ca> <4gaq03$3sh@news3.cts.com> In article <4gaq03$3sh@news3.cts.com>, jlkolb@sd.cts.com says... > >charles copeland (charles1@netcom.com) wrote: >: In article <4ft09j$ias@crchh327.rich.bnr.ca>, >: Ken Edwards wrote: >: >I have a Kenwood TS-820S that I would like to run off battery in >: >cases of emergency. >:How is the power (DC) connected into the system ? > The TS-820S that I had only required the DS-1A (2 Transistors & Heatsink). The original transformer had separate winding for the DS-1A. Worked very nicely. I wanted to build my own, but could not find the transistors at the time (early 1980's) Charlie AA7NQ From lwbyppp@epix.net Tue Feb 27 20:10:02 1996 From: Jay Wicklund Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew Subject: Re: File formats to download Date: Thu, 22 Feb 96 09:34:25 PDT Message-ID: References: <4foh5t$u6t@opera.iinet.net.au> <31229c3a.4119415@news.gnn.com> <4ge356$g0p@prometheus.algonet.se> In article Christer Johansson writes: > I must say that I agree 100% even if I didn't bought any shares in > Adobe. The PDF format is *GREAT* for technical publications and now > when the Netscape plugin is avaiable I think it will become more and > more common. > Only one caution; the first time that I downloaded a large datasheet using pdf, my system warned me that it was possible to imbed macros and viruses in the pdf documents that could disrupt your system - and therefore to only download documents from sources that you trust. I don't know much about Acrobat and the pdf format so I can't verify the accuracy of the warning, but I have no reason to doubt it. Other than that caution, I agree it does result in very nice looking documents and in more compact form than postscript. 73 de KI7RH From lwbyppp@epix.net Tue Feb 27 20:10:03 1996 From: cj@hth.com (Christer Johansson) Newsgroups: sci.electronics.design,rec.radio.amateur.homebrew Subject: Re: File formats to download Date: Wed, 21 Feb 1996 03:13:40 GMT Message-ID: <4ge356$g0p@prometheus.algonet.se> References: <4foh5t$u6t@opera.iinet.net.au> <31229c3a.4119415@news.gnn.com> Reply-To: cj@hth.com Hi Rit, ritk@aol.com (Rit Keiter) wrote: >Recently, I was so impressed with Adobe's Acrobat PDF (Portable >Document File) format, that I bought 300 shares of their stock. I >also purchased their $125 Adobe Exchange for win that produces .pdf's >from any app that can print to a windows printer. Portable means all >platforms; Windows, Macs, Unix. I must say that I agree 100% even if I didn't bought any shares in Adobe. The PDF format is *GREAT* for technical publications and now when the Netscape plugin is avaiable I think it will become more and more common. >I discovered Acrobat by visiting the Maxim Integrated Products site >(search on maxim). They have a link to the free reader download. I >downloaded a 10 page Maxim data sheet in 45 seconds at 14.4 K. I was >astounded by the quality and detail of the line art and the tiny >fonts. It took 4 minutes to print on an old HP laser III without >Postscript capability. May be much faster with Postscript printers. Yes, many of the Semiconductor manufacturers have their datasheets and application notes available in PDF and I like to be able to get new tech info right from the net and maybe someday my crowded bookshelfs will dissapear :-).... >I have used Exchange on a 255K WordPerfect document containing several >Acad generated line dwgs, to produce a 110K PDF that prints with no >perceptible degradation. The PDF format has "builtin" compression and it's quite effective as you just mentioned. Good luck with your stocks ;-)... Regards, /Christer -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- * High Tech Horizon - Christer Johansson - E-mail: cj@hth.com * -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- * Vi saljer Parallax, Inc. BASIC Stamp's produkter i Skandinavien * >> World Wide Web On-Line Catalog - http://www.hth.com << -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- From lwbyppp@epix.net Tue Feb 27 20:10:04 1996 From: brian_jones@uk.ibm.org (Brian Jones) Newsgroups: rec.radio.amateur.homebrew Subject: First QRP CW kit. Date: Mon, 26 Feb 1996 18:29:59 GMT Message-ID: <4gsu79$144c@zen.hursley.ibm.com> Reply-To: brian_jones@uk.ibm.org I'm looking to build a QRP CW transceiver preferably for 20m. Any reccomendations for a good kit for a first time builder. I can solder OK and probably manage fairly fine tracks but don't have a barrage of test equipment (except a good multimeter and an old 'scope which I'm pretty inexperienced at using). I'd like something reasonably challenging but not to difficult to align with rudimentary gear which doesn't cost an arm and leg (and of course which will work VP9 on 1milliwatt at sunspot cycle low !!). Brian Jones G0UKB - KB8YKJ brian_jones@uk.ibm.com From lwbyppp@epix.net Tue Feb 27 20:10:05 1996 From: hho@olicom.dk (Henrik Holmgaard) Newsgroups: rec.radio.amateur.homebrew Subject: Frankfurt VLF time standard Date: Thu, 22 Feb 96 16:28:35 PST Message-ID: <4gi22t$fgq@news.dknet.dk> Hi All Does anybody in this news group Where I can get information about Frankfurt VLF time standard: freq., time specifications, etc. if anybody have a ciurcit for at reciever to this Time standard. Henrik HHO@olicom.dk From lwbyppp@epix.net Tue Feb 27 20:10:06 1996 From: magne@nvg.unit.no (Magne M{hre) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Frankfurt VLF time standard Date: 24 Feb 1996 10:18:49 GMT Message-ID: <4gmom9$d7g@due.unit.no> References: <4gi22t$fgq@news.dknet.dk> Henrik Holmgaard (hho@olicom.dk) wrote: : Hi All : Does anybody in this news group Where I can get information about : Frankfurt VLF time standard: freq., time specifications, etc. : if anybody have a ciurcit for at reciever to this Time standard. Look up http://www.tu-bs.de/rz/sysadmin/dienste/ntp/clock.txt.html The document describes various standard time/frequency stations, with the protocols, frequencies etc. used. --Magne From lwbyppp@epix.net Tue Feb 27 20:10:07 1996 From: elendir@enst.fr (Elendir) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Frankfurt VLF time standard Date: 23 Feb 1996 09:38:34 GMT Message-ID: <4gk1uq$10a@tempo.univ-lyon1.fr> References: <4gi22t$fgq@news.dknet.dk> Henrik Holmgaard (hho@olicom.dk) wrote: : Hi All : Does anybody in this news group Where I can get information about : Frankfurt VLF time standard: freq., time specifications, etc. : if anybody have a ciurcit for at reciever to this Time standard. You mean DCF77 ? I guess it's on 77 kHz, and there has been a decoder published some time ago on Elektuur. I'll try to get more info. 73, Vince -- F5RCS - Worldwide Friendship through Amateur Radio ENST, Ecole Nationale Superieure des Telecommunications, Paris From lwbyppp@epix.net Tue Feb 27 20:10:08 1996 From: wautelet@innet.be (Thierry Wautelet) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Frankfurt VLF time standard Date: Sun, 25 Feb 1996 16:54:29 +0100 Message-ID: References: <4gi22t$fgq@news.dknet.dk> In article <4gi22t$fgq@news.dknet.dk>, hho@olicom.dk (Henrik Holmgaard) wrote: >Hi All > >Does anybody in this news group Where I can get information about >Frankfurt VLF time standard: freq., time specifications, etc. >if anybody have a ciurcit for at reciever to this Time standard. > >Henrik >HHO@olicom.dk > Hi, Freq is 77 Khz (easy enough, it's called DCF77). Take a look at some Elektuur (or whatever it's called in your national language if there is an edition), you should be able to find more info. I have 2 clocks (one analog other digital) running on DCF77, nice gadget makrr are CITIZEN and JUNGHANS. There a lot of clocks available quite cheap from german company. Also interface for PC (and Mac ?). Hope it help, Thierry ---------------------------------------------------------------------------- Internet : wautelet@innet.be A PowerMac User ! CIS : 76334,337 Ham : ON7KL@ON7RC.#BT.BE.EU From lwbyppp@epix.net Tue Feb 27 20:10:09 1996 Newsgroups: rec.radio.amateur.homebrew Subject: FS -- SHURE 450 DISK MIC Message-ID: <1996Feb17.213917.114220@kuhub.cc.ukans.edu> From: Bill Date: 17 Feb 96 21:39:15 CST SHURE MODEL 450 desk mic Selectable impedance: HI-Z = 15K ohm LO-Z = 215 ohm $35.00 I will pay all shipping and C.O.D. fees to any address in lower 48 states. Bill AA4FM/0 From lwbyppp@epix.net Tue Feb 27 20:10:10 1996 Newsgroups: rec.radio.amateur.homebrew From: "Al Koblinski (W7XA)" Subject: Re: FS: Jenning Vacuum Caps Message-ID: To: rsrolfne@atnet.net References: Date: Sat, 24 Feb 1996 00:45:06 GMT Are the caps still available? Do you have any mounting hardware? I might as well ask this too, do you have any transmitting type "doorknob" ceramic capacitors, 1000pf @ 20KV or 500pf @ 20 KV? let me know please. 73, Al From lwbyppp@epix.net Tue Feb 27 20:10:11 1996 From: Bill Meara Newsgroups: rec.radio.amateur.homebrew Subject: Hamtronics e-mail??? Date: 24 Feb 1996 11:30:13 GMT Message-ID: <4gmss5$4pu@server2.codetel.net.do> I'm having a bit of trouble with my Hamtronics 435 mhz tranverter (no doubt caused by me!) Anyone have an e-mail address for them. Better yet, are there any tranverter guru's out there? Bill N2CQR/HI8 From lwbyppp@epix.net Tue Feb 27 20:10:11 1996 From: kuehn@hera.cc.bellcore.com (bandyopadhyay,asismoy) Newsgroups: rec.radio.amateur.homebrew Subject: Help Please !!! Date: 20 Feb 1996 18:18:21 -0500 Distribution: usa Message-ID: <4gdkrt$3de@hera.cc.bellcore.com> I need the following transistors: MJH16010A - 2pcs. probably Motorola ZTX650 - 4 pcs. & ZTX750 - 4 pcs. - probably Zetex ? I tried Mouser, Digikey, no luck. Digikey can order ZTX 650 and 750 for me but it would take 18 weeks! Will Motorola or Zetex (?) entertain orders for such miniscule quantities ? Any ideas ???? Thanks - asis VU2MKI From lwbyppp@epix.net Tue Feb 27 20:10:12 1996 From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help with Heath VTVM!!!! Date: Fri, 23 Feb 96 13:19:51 PDT Message-ID: References: <4gj9k5$nrs@detroit.freenet.org> Hi Jeff, I can't think of anything obvious but there are a couple of things that you can look at. 1. put the meter in the ohms position with the probes disconnected or open. Does it read full scale now? This also puts 1.5v onto the meter circuit but without the DC input attenuator in the circuit. If this doesn't give you full scale (you might have to adj the ohms adj), then the problem is most likely in the 12AU7 & meter circuit. If it does look normal, then the problem is most likely in the probe and attenuator circuit. 2. You didn't say which model, but if it has the combined AC/DC/OHMs probe, try putting the probe switch (not the mode selector) into the AC/ohms position while probing the 1.5v battery. This will bypass the 1m resistor in the probe. If the meter now adjusts to full scale it suggests that the input attentuator has too low a resistance and the 1meg in the probe is dropping the voltage. If you have a good DVM you can try measuring the input attenuator resistance (do this with the VTVM power off and the plug pulled. Then just connect the dvm probes to the VTVM probes - you should get 11meg). Let me know what you find----we'll get it working....Jay From lwbyppp@epix.net Tue Feb 27 20:10:14 1996 From: macino@mail.fwi.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help with Heath VTVM!!!! Date: 24 Feb 1996 00:21:17 GMT Message-ID: <4glllt$35t@news.ios.com> References: <4gj9k5$nrs@detroit.freenet.org> Reply-To: macino@mail.fwi.com In <4gj9k5$nrs@detroit.freenet.org>, af104@detroit.freenet.org (Jeffrey L. Bau man) writes: > > >I'm having the dumb problem of not being able to swing the >needle all the way over to the 1.5V marker by adjusting the DC >calibrate pot. All wiring is correct, and the 12AU7 is just >fine. > >Double checked the wiring - it's correct, with no apperent >cold solder joints. Correct components in place. > >I wired this myself recently, and just cant "calibrate" the >meter. > >Anyone know of any mods / errata on this VTVM? it >'s the wide one with the large meter. The box pivots in a >"U" shaped mounting bracket. > >Probe is fine. 1.5V voltage source fine. This is stupid, but >just can't get it to calibrate! > >Thanks, > >Jeff >WB5KZW >-- Hi Jeff, If you have another meter, you just might want to check the B+ and the other voltages to the tube. Even though you have a good tube, you may not be putting the correct DC levels to it. Good luck. WD9AHF - Jim From lwbyppp@epix.net Tue Feb 27 20:10:14 1996 From: af104@detroit.freenet.org (Jeffrey L. Bauman) Newsgroups: rec.radio.amateur.homebrew Subject: Help with Heath VTVM!!!! Date: 23 Feb 1996 02:43:17 GMT Message-ID: <4gj9k5$nrs@detroit.freenet.org> I'm having the dumb problem of not being able to swing the needle all the way over to the 1.5V marker by adjusting the DC calibrate pot. All wiring is correct, and the 12AU7 is just fine. Double checked the wiring - it's correct, with no apperent cold solder joints. Correct components in place. I wired this myself recently, and just cant "calibrate" the meter. Anyone know of any mods / errata on this VTVM? it 's the wide one with the large meter. The box pivots in a "U" shaped mounting bracket. Probe is fine. 1.5V voltage source fine. This is stupid, but just can't get it to calibrate! Thanks, Jeff WB5KZW -- From lwbyppp@epix.net Tue Feb 27 20:10:15 1996 From: "Michael G. Reiney" Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: HF receive for Yaesu FRG9600?? Date: 21 Feb 1996 21:01:49 GMT Message-ID: <4gg17t$qma@vista.hevanet.com> Is/was there available a HF receive option to the Yaesu FRG9600? There's a blank spot on the board for the module. The software and PLL are se t up to receive from zero to 999 MHz. if you use 73 MHz. first IF and high side LO injection. Has anyone ever tried to build such an option? Anybody interested in working on such an option? Except for the availability of the Xtal to get from 73 MHz. to 45 MHz. it should be pretty trivial. miker From lwbyppp@epix.net Tue Feb 27 20:10:16 1996 From: timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Homebrew earphone - Mike Date: 26 Feb 1996 14:03:32 GMT Message-ID: <4gsejk$f2l@reader2.ix.netcom.com> References: <4grm8r$gi3@newsbf02.news.aol.com> In <4grm8r$gi3@newsbf02.news.aol.com> mvenable@aol.com (MVenable) writes: > >I want to use my 2-meter HT while motorcycle mobile. I also wear a full >face helmet. The helmet speaker/microphone conversions are pretty pricey. >I've seen ads for earphones that work as mikes (also expensive). Seems >like a good do-it-yourself project. Does anyone know how to homebrew an >earphone-mike that will work under the helmet? > >Thanks and 73 > >Mark Venable N1RSK > Hi Mark: I used to ride and had a Bell full face, I used a simple electret mike element glued into the chin portion of the helment, the speaker used was a simple 2" flat style I picked up at a hamfest. I did have to dig out a little of the cushion inside the helmet. The most unique portion however was a differential circuit made which took the input from another mike element mounted on the side of the helmet just under the lip. With motor noise comming into both elements the differential circuit only passed my voice to the rig (Well not 100% obviously) but WOW what a difference! Without it there was too much engine noise to have a decent QSO. The rest was just simple switching, I ran the PTT to a snap action micro-switch near the horn. Hope this gives you some ideas. Good Luck Tim, ka8ddz From lwbyppp@epix.net Tue Feb 27 20:10:17 1996 From: mvenable@aol.com (MVenable) Newsgroups: rec.radio.amateur.homebrew Subject: Homebrew earphone - Mike Date: 26 Feb 1996 02:08:11 -0500 Message-ID: <4grm8r$gi3@newsbf02.news.aol.com> Reply-To: mvenable@aol.com (MVenable) I want to use my 2-meter HT while motorcycle mobile. I also wear a full face helmet. The helmet speaker/microphone conversions are pretty pricey. I've seen ads for earphones that work as mikes (also expensive). Seems like a good do-it-yourself project. Does anyone know how to homebrew an earphone-mike that will work under the helmet? Thanks and 73 Mark Venable N1RSK From lwbyppp@epix.net Tue Feb 27 20:10:18 1996 From: hillgen@remus.rutgers.edu (Fender) Newsgroups: rec.radio.amateur.homebrew Subject: Ideas on a power antenna Date: 21 Feb 1996 15:50:14 -0500 Message-ID: <4gg0i6$qat@remus.rutgers.edu> Here's my idea. I have a Lincoln Continental that I'm absolutely in love with and I really would like to have my 2m radio in it but I'm not too eager to slap a mag-mount on it or even (gasp) drill holes in it so i have an idea for a compromise. How feasable would it be to build some sort of matchbox so that I could run realtively low power (50 watts or less) at good SWR through the power antenna used for the FM stereo. I figure that if it works, I'd mount a second in the fender and it could retract out of the way when not in use. I figure that it would have a good ground plane but how would I achieve a good match? All advice appreciated! If this idea doesn't work out, anybody have any others for a rather inconspicuous antenna? Thanks! Jay N2OTK From lwbyppp@epix.net Tue Feb 27 20:10:19 1996 From: Jim Strohm Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ideas on a power antenna Date: 22 Feb 1996 13:17:07 GMT Message-ID: <4ghqcj$sgv@newsgate.sps.mot.com> References: <4gg0i6$qat@remus.rutgers.edu> hillgen@remus.rutgers.edu (Fender) wrote: > anybody have any others for a rather inconspicuous antenna? I don't know if these are still available -- a few years ago, there was a stick-on 2 meter antenna available that looked like some kind of car alarm decal. You'd just paste it inside a window. Performance reports were good, considering the style of antenna (couldn't touch a 5/8 whip on the roof, but it would take > 50 watts). You might also consider some of the on-glass antennas, if you don't mind having people think you have a call phone. Both of these would be simpler than loading up the FM antenna. From lwbyppp@epix.net Tue Feb 27 20:10:20 1996 From: macino@mail.fwi.com@fwi.com Newsgroups: rec.radio.amateur.homebrew Subject: Re: Ideas on a power antenna Date: 24 Feb 1996 01:15:44 GMT Message-ID: <4glos0$92o@news.ios.com> References: <4gg0i6$qat@remus.rutgers.edu> Reply-To: macino@mail.fwi.com In <4gg0i6$qat@remus.rutgers.edu>, hillgen@remus.rutgers.edu (Fender) writes: > >Here's my idea. I have a Lincoln Continental that I'm absolutely in love >with and I really would like to have my 2m radio in it but I'm not too eager >to slap a mag-mount on it or even (gasp) drill holes in it so i have an idea >for a compromise. How feasable would it be to build some sort of matchbox >so that I could run realtively low power (50 watts or less) at good SWR >through the power antenna used for the FM stereo. I figure that if it works, > I'd mount a second in the fender and it could retract out of the way when >not in use. I figure that it would have a good ground plane but how >would I achieve a good match? All advice appreciated! If this idea doesn't >work out, anybody have any others for a rather inconspicuous antenna? > > Thanks! > Jay > N2OTK > >Jay, Have you ever considered an 'on glass' antenna? It'll do just about every th ing you want except retract. In that case you, unscrew the antenna mast and toss it in the back seat. It'll be a lot less hassle in the long run. They run abo ut $50 for a pretty good one. Ji m From lwbyppp@epix.net Tue Feb 27 20:10:22 1996 Newsgroups: rec.radio.amateur.homebrew From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Ideas on a power antenna Message-ID: <1996Feb23.171354.19185@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) References: <4gg0i6$qat@remus.rutgers.edu> Date: Fri, 23 Feb 1996 17:13:54 GMT In article <4gg0i6$qat@remus.rutgers.edu> hillgen@remus.rutgers.edu (Fender) w rites: > >Here's my idea. I have a Lincoln Continental that I'm absolutely in love >with and I really would like to have my 2m radio in it but I'm not too eager >to slap a mag-mount on it or even (gasp) drill holes in it so i have an idea >for a compromise. How feasable would it be to build some sort of matchbox >so that I could run realtively low power (50 watts or less) at good SWR >through the power antenna used for the FM stereo. I figure that if it works, > I'd mount a second in the fender and it could retract out of the way when >not in use. I figure that it would have a good ground plane but how >would I achieve a good match? All advice appreciated! If this idea doesn't >work out, anybody have any others for a rather inconspicuous antenna? Antenna Specialists offers a line of "disguise" antennas to the police market for undercover use. They replace the stock factory entertainment radio antenna and *look just like it*. Under the fender they're different of course. Models are available for VHF and UHF, *and* the entertainment radio still works too thanks to a duplexer circuit included with the antennas. These antennas aren't listed in amateur catalogs, just in police supply catalogs. Check with your local PD radio shop, or talk directly to Antenna Specialists to see if they have one for your model Lincoln (probably so since it shares antennas with other Fords). You could build something similar, but the mechanics could be somewhat daunting if appearance is important. 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 lwbyppp@epix.net Tue Feb 27 20:10:23 1996 From: Rick Perry Newsgroups: rec.radio.amateur.homebrew Subject: info NORCAL QRP Date: Wed, 21 Feb 1996 20:30:06 -0800 Message-ID: <312BF14E.506E@wolfenet.com> Does anyone out there know where I can get info (cost-where to order etc.)on the NORCAL QRP 75&20 SSB xcvr. I've seen one and it really looks interesting. TNX Rick KG7A From lwbyppp@epix.net Tue Feb 27 20:10:24 1996 From: wa4ucf@pcc-uky.campus.mci.net (jerry shepherd) Newsgroups: rec.radio.amateur.homebrew Subject: KENWOOD TM-251A MODS Date: Thu, 22 Feb 1996 04:42:27 GMT Message-ID: <4ggs2q$fd5@ns.campus.mci.net> i NEED ANY MODS FOR THE KENWOOD TM51-A 2 METER RIG. warucf@pcc-uky.campus.mci.net From lwbyppp@epix.net Tue Feb 27 20:10:24 1996 From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Mods for PRO-23?? Date: Thu, 22 Feb 1996 09:18:41 -0700 Message-ID: <312C9761.8B4@lanl.gov> I'm still looking for mods for the Realistic PRO-23 scanner, or a newsgroup/list that supports such mods. Thanks in advance, -- |-------------------------------------------------------| |Jim Devenport WB5AOX | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |HTTP://nis-www.lanl.gov/~jdport/ | |-------------------------------------------------------| From lwbyppp@epix.net Tue Feb 27 20:10:26 1996 From: zimmie@gti.net (zimmie) Newsgroups: rec.radio.amateur.homebrew Subject: MOSFET X-Ref: help! Date: 22 Feb 1996 03:08:39 GMT Message-ID: <4ggmnn$6ia@gti.gti.net> Recently an audio amplifier of mine ceased to work. Upon smelling fried semiconductor, I opened the case and found two of the power supply FET's fried. I assume they are MOSFET's since the company boasts of it being a mosfet amp. All four (there are two banks of two) FET's are the same; however, I cannot find any cross-referance to the number on them. There is an emblem on the case (TO-220) that appears to be "ST" in reverse text, followed by the number 9448. There is also a number, P30N06, towards the bottom of the case. I may be wrong, but from following the circuit, these devices seem to be N-channel. Although it would be bennificial to try to track down the cause of the failure, I would like to try replacing these devices first, if the cost is not high. I would greatly appreciate it if anyone can help me find these devices or give me a cross-ref part number. 73 jeff From lwbyppp@epix.net Tue Feb 27 20:10:26 1996 From: "Thomas C. J. Sefranek" Newsgroups: rec.radio.amateur.homebrew Subject: Re: MOSFET X-Ref: help! Date: 23 Feb 1996 02:34:04 GMT Message-ID: <4gj93f$gbu@news.iii.net> References: <4ggmnn$6ia@gti.gti.net> To: zimmie@gti.net Try MTP30N06 Motorola See the Motorola Power FETs web site for specifications Tom From lwbyppp@epix.net Tue Feb 27 20:10:28 1996 From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NE602 source drys up Date: 20 Feb 1996 23:03:43 GMT Message-ID: <4gdk0f$f53@abyss.West.Sun.COM> References: <4gdcou$qf0@solaris.cc.vt.edu> In article <4gdcou$qf0@solaris.cc.vt.edu>, Ben E. Cline wrote: >There was talk here a while back about Digi-Key selling >NE602s. They are out of stock now and don't plan to >restock. (If someone else has already noted this here, >sorry for the extra post.) > >73, Benjy Oh no!!!! At least you can still buy discrete JFETs and bipolar transistors, build an oscillator, and either build or buy a diode ring mixer. If you really want gain in front of the mixer, you can use another discrete transistor to build a preamp.... ;-) -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Tue Feb 27 20:10:29 1996 From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: NE602 source drys up Date: Thu, 22 Feb 1996 09:57:07 -0800 Message-ID: References: <4gdcou$qf0@solaris.cc.vt.edu> <4gee00$45m@news3.cts.com> One of the reasons the NE602 is unavailable is that higher dynamic range NE602A units are coming out! The newer units have larger printed letters than the older units. Just how much better the newer units are to be is a question I have as well! 73 Cliff Buttschardt W6HDO Morro Bay, CA On 21 Feb 1996, John Kolb wrote: > Ben E. Cline (benjy@benjy.cc.vt.edu) wrote: > : There was talk here a while back about Digi-Key selling > : NE602s. They are out of stock now and don't plan to > : restock. (If someone else has already noted this here, > : sorry for the extra post.) > > I picked up a couple last week at RF Parts, San Marcos CA. > See ads in QST, etc. > > > From lwbyppp@epix.net Tue Feb 27 20:10:30 1996 From: jeffd@coriolis.com (Jeff Duntemann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NE602 source drys up Date: Thu, 22 Feb 1996 21:47:03 GMT Message-ID: <4giobq$a4u@globe.indirect.com> References: <4gdcou$qf0@solaris.cc.vt.edu> <4gee00$45m@news3.cts.com> >> Ben E. Cline (benjy@benjy.cc.vt.edu) wrote: >> : There was talk here a while back about Digi-Key selling >> : NE602s. They are out of stock now and don't plan to >> : restock. (If someone else has already noted this here, >> : sorry for the extra post.) >> >> I picked up a couple last week at RF Parts, San Marcos CA. >> See ads in QST, etc. A company here in Scottsdale stocks a great many RF-related ICs and some transistors, and their customer service is superb. They're called DC Electronics, on Scottsdale Road. (I don't have an address or phone for them here at the office, but they're in directory assistance.) By all means get their catalog. I've bought most of my NE602s from them, as well as the Motorola RF chips like the MC3362 and MC2833. --73-- --Jeff Duntemann KG7JF Scottsdale, Arizona From lwbyppp@epix.net Tue Feb 27 20:10:31 1996 From: benjy@benjy.cc.vt.edu (Ben E. Cline) Newsgroups: rec.radio.amateur.homebrew Subject: Re: NE602 source drys up Date: 22 Feb 1996 18:29:05 GMT Message-ID: <4giclh$7cq@solaris.cc.vt.edu> References: <4gdk0f$f53@abyss.West.Sun.COM> In article <4gdk0f$f53@abyss.West.Sun.COM> myers@West.Sun.COM (Dana Myers) writes: > In article <4gdcou$qf0@solaris.cc.vt.edu>, > Ben E. Cline wrote: > >There was talk here a while back about Digi-Key selling > >NE602s. They are out of stock now and don't plan to > >restock. [snip] > > Oh no!!!! At least you can still buy discrete JFETs and bipolar > transistors, build an oscillator, and either build or buy a diode > ring mixer. If you really want gain in front of the mixer, you > can use another discrete transistor to build a preamp.... > > ;-) Isn't that a lot to ask from a software guy like me who doesn't always remember which end of the soldering to hold :-). Benjy -- Benjy Cline, AC4XO, Ph.D. Virginia Tech Computing Center benjy@benjy.cc.vt.edu http://benjy.cc.vt.edu:1951/~benjy/ From lwbyppp@epix.net Tue Feb 27 20:10:34 1996 From: username@shore.net (Your Name) Newsgroups: rec.radio.amateur.homebrew Subject: Need 6.5536 mhz crystal Date: 21 Feb 1996 14:20:16 GMT Message-ID: <4gf9n0$6mf@shore.shore.net> If you`ll sell one, email squid@shore.net. I`ll only pay in cash, must be in U.S. No more than $5. squid@shore.net From lwbyppp@epix.net Tue Feb 27 20:10:35 1996 From: subbustr@whidbey.net (DAVE M . SCHERTZER) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need MOD for Kenwood TH251a Date: 22 Feb 1996 14:33:40 GMT Message-ID: <4ghus4$rq7@whidbey.whidbey.com> References: <4g8uep$mra@services.arn.net> Only mod I have iz... - Remove diode D416 subbustr@whidbey.net From lwbyppp@epix.net Tue Feb 27 20:10:35 1996 From: uid@ornl.gov Newsgroups: rec.radio.amateur.homebrew Subject: Need Recommendation for DSP Design Date: Thu, 22 Feb 1996 18:45:34 GMT Message-ID: I need a recommendation for a compact DSP unit for 2.7 KHz Bandwidth SSB transceiver only. I thought about robbing a Radio Shack unit of the components needed just for my homebrew application. Any recommendations for DSP chips which already have the code in them and I can design around them? Danny Britton qb7@ornl.gov From lwbyppp@epix.net Tue Feb 27 20:10:37 1996 From: David Nulton Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Recommendation for DSP Design Date: 25 Feb 1996 16:12:39 GMT Message-ID: <4gq1pn$3n9@alterdial.UU.NET> References: To: qb7@ornl.gov Danny: For audio DSP - the Texas Instruments TMS320C(10,20,30) chips are the best (IMHO). There is also a large collection of TMS320 programs and discussion associated with audio filters and other DSP stuff. As far as a DSP chip with stuff already in it, I don't know of any. You must write a program, assemble and program the chip. For assembly, TASM is a freeware assembler that handles the 320 in addition to other popular uPs. I believe the EEPROM version of the TMS320 can be adapted to a 27c256 or simular EEPROM programmer. If you really want to get into it, TI offers some development kits with already assembled boards and PC software to plug and play you programs for about $100 if I remember correctly. Hope this helps 73s de KI5XW From lwbyppp@epix.net Tue Feb 27 20:10:38 1996 From: Peter Trapp Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Recommendation for DSP Design Date: 23 Feb 1996 00:20:46 GMT Message-ID: <4gj18u$rh@ddi2.digital.net> References: To: uid@ornl.gov Is this filter for the audio or receiver's "IF"? If it's for the "IF" what is the if frequency? -- ****************************************************************** * An explanation should be as simple as possible, but no simpler * * - Albert Einstein * *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~* * Peter Trapp alpha10@digital.net * ****************************************************************** From lwbyppp@epix.net Tue Feb 27 20:10:39 1996 From: uid@ornl.gov Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Recommendation for DSP Design Date: Fri, 23 Feb 1996 12:34:19 GMT Message-ID: References: In article uid@ornl.gov writes: >Path: stc06.ctd.ornl.gov!zaek25.ymd.ornl.gov!uid >From: uid@ornl.gov >Newsgroups: rec.radio.amateur.homebrew >Subject: Need Recommendation for DSP Design >Date: Thu, 22 Feb 1996 18:45:34 GMT >Organization: Oak Ridge National Lab, Oak Ridge, TN >Lines: 10 >Message-ID: >NNTP-Posting-Host: zaek25.ymd.ornl.gov >X-Newsreader: Trumpet for Windows [Version 1.0 Rev A] >I need a recommendation for a compact DSP unit for 2.7 KHz Bandwidth SSB >transceiver only. I thought about robbing a Radio Shack unit of the component s >needed just for my homebrew application. >Any recommendations for DSP chips which already have the code in them and I >can design around them? >Danny Britton >qb7@ornl.gov Audio DSP Danny From lwbyppp@epix.net Tue Feb 27 20:10:40 1996 From: Neal McEwen Newsgroups: rec.radio.amateur.homebrew Subject: Neel parts to restore old Keys and Bugs Date: Mon, 19 Feb 1996 21:56:20 -0800 Message-ID: <31296284.1E73@metronet.com> I have several restoration in progress and need parts. Do you have any old telegraph keys or bugs lying in around. I would like to buy what you have for parts. Would also be interested in any servicable keys that you have. Check out my home page for a list of duplicate keys that I have for trade. -- 73 de K5RW - Neal McEwen - Richardson, TX (Dallas) ******** I collect old telgraph and wireless telegraph keys ********* HomeNet - nmcewen@metronet.com - OS/2 tcp/ip SLIP HomePage - http://fohnix.metronet.com/~nmcewen/k5rw.html From lwbyppp@epix.net Tue Feb 27 20:10:41 1996 From: wayne@interval.com (wayne burdick) Newsgroups: rec.radio.amateur.homebrew Subject: new rigs now tested with Wilderness Radio's KC1 keyer/counter Date: Tue, 20 Feb 1996 11:57:57 -0800 Message-ID: In addition to the list of rigs in the current manual, the KC1 keyer/freq. counter has now been successfully installed in the following rigs: "A Small High-Performance CW Transceiver for 20m," Nov'95 QST, by Rick Campbell, KK7B (installed by Dave, KE6ZBZ) MFJ 9420 w/CW adapter (Mike, AC6JA) OHR Explorer I (Tom, WA1GUV) OHR Explorer II NorCal Cascade (Rob, WA3ULH) * * * The original list of rigs includes: NorCal 40 (all versions), Sierra (NorCal), Heathkit HW8 and HW9, SWL XX-40 (Small Wonders Labs), OHR-400 (Oak Hills Research), and the Gary Breed transceiver (A&A kits and 624 kits). * * * If you know of others not on this list, please send them to me. I will be incorporating instructions for all of the new rigs in the next release of the KC1 manual. The KC1 is a subminature (2.5 x 0.8") universal Iambic keyer and displayless frequency counter (3-digit Morse code output) for QRP rigs. For more info contact Bob Dyer, KC6VIO at 415-494-3806. 73, Wayne N6KR From lwbyppp@epix.net Tue Feb 27 20:10:42 1996 From: ccallewa@cmsa.gmr.com (Clyde) Newsgroups: rec.radio.amateur.homebrew Subject: PIN Diode I-V ?? Date: Thu, 22 Feb 1996 11:05:52 GMT Message-ID: <4gi3v2$98d@oldsuna.gmr.com> Reply-To: ccallewa@cmsa.gmr.com (Clyde) Hi guys, I'm building an X-band BPSK transmitter and need to know the I-V characteristics of typical PIN diodes used in a double balanced mixer? Altough not elegant, I intend to directly modulate the carrier by applying the NRZ to the LO port of the double balanced mixer which cost about $700 each. Hence, I need to control the drive to stay within budget. Thanks in advance, Clyde. From lwbyppp@epix.net Tue Feb 27 20:10:43 1996 Newsgroups: rec.radio.amateur.homebrew From: dstock@hpqmdla.sqf.hp.com (David Stockton) Subject: Re: PLL loop filter questions and idea Message-ID: Date: Tue, 20 Feb 1996 17:07:19 GMT References: <4gaohl$qe7@abyss.West.Sun.COM> Dana Myers (myers@West.Sun.COM) wrote: : I'm not familiar with LTC Design Note 7, but I'd guess they're : using the 4046 in some application other than a radio transmitter : or receiver local oscillator. I've just had a look at LTC DN7 page 2. I think you're dead right, Dana. Fig D is nice, a scope shot of a rising edge showing about 1us of jitter at an output freq of 6kHz and a ref freq of 60 Hz. With an RC filter they show about 30us of jitter. OK, that's quite an improvement, but the 4046 VCO is spectacularly nasty open loop. Current/voltage/ Capacitor VCOs like RC oscillators have Q's less than 1 From the text, the thing seems to be a clock multiplier intended to drive a tracking switched cap filter - presumably to filter a mains freq signal. Cheers, David GM4ZNX From lwbyppp@epix.net Tue Feb 27 20:10:44 1996 From: myers@West.Sun.COM (Dana Myers) Newsgroups: rec.radio.amateur.homebrew Subject: Re: PLL loop filter questions and idea Date: 19 Feb 1996 21:02:45 GMT Message-ID: <4gaohl$qe7@abyss.West.Sun.COM> References: <4flegc$56j@news.aladdin.co.uk> <4ga128$r4@news.aros.net> In article <4ga128$r4@news.aros.net>, Douglas L. Datwyler wrote: >In article <4flegc$56j@news.aladdin.co.uk>, drassew2@aladdin.co.uk says... >> >>>Maxim has some nice eighth order switched capacitor filters which could >>>easily fill this role. They are clocked at 100 times the highest passed >>>frequency and are available in the three classic filter topoligies. It >>>would be easy to put in a 1MHz clock with a 10x prescaler for a wide >>>passband and then increase the prescaler value (eight bit counter) when >>>the PLL has locked. Would this do what I think and decrease phase noise? ... >>Don't even think of using switched capacitor filters in PLLs. There >^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >Better tell Linear Technologies Corp. Thieir Design Note 7 utilizes an >LTC1062, a 5th order, switched-capacitor filter for the loop filter. The note >shows the jitter of a standard RC filter in a CD4046 loop and a filter built >with this part. THe jitter is down to internal jitter of VCO (Claimed). The problem with a switched capacitor PLL loop filter is that the residual sampling noise of the filter could introduce additional modulation sidebands in the VCO. This can be reduced by using an RC low pass filter following the switched capacitor filter with a corner much higher than the loop filter corner but lower than the filter sample rate. The important question is "what is the application?". A PLL used for frequency synthesis will be much more stringent than a PLL used for clock recovery on a data signal or FM demodulation. If you have modulation sidebands out 1MHz from the synthesizer frequency that are -60dBc, that may not mean snot to a data recovery circuit but could wreak havoc in a broadbanded radio transmitter. I'm not familiar with LTC Design Note 7, but I'd guess they're using the 4046 in some application other than a radio transmitter or receiver local oscillator. -- * Dana H. Myers KK6JQ, DoD#: j | Views expressed here are * * (310) 348-6043 | mine and do not necessarily * * Dana.Myers@West.Sun.Com | reflect those of my employer * From lwbyppp@epix.net Tue Feb 27 20:10:46 1996 From: Per Stangeland Newsgroups: rec.radio.shortwave,rec.radio.amateur.antenna,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.amateur.homebrew,rec.radio.amateur.misc,rec.radio.amateur.policy,rec.radio.amateur.space,rec.radio.noncomm,rec.radio.scanner,rec.radio.shortwave,rec.radio.swap Subject: Re: Radio Database Program LW, MW, SW coverage for YOU..... Date: 22 Feb 1996 19:50:43 GMT Message-ID: <4gihej$3q6@nms.telepost.no> References: <4gduns$sio@news.flinet.com> To: chuck@mail.flinet.com Charles Bolland wrote: >FRIENDS, > >If you would like a free copy of a radio database program that covers >longwave, mediumwave, and shortwave with at least 4,000 of records, send >your NAME, POSTAL ADDRESS, and EMAIL address to chuck@flinet, and I will >return the program to you via EMAIL. > >The program is not up to date! It is a program used during 1994 and >hasn't be updated since. However, many of the records are still current >for stations that do not change every quarter. > >The program is good until June 6, 1996. After that it will not function. > >Hope to hear from you and don't forget your Postal Address for >registration and future information via mail.. > >All addresses will be kept confidential! > >Chuck > >chuck@flinet.com > > My address is: Per Stangeland Luftfartsverket Luftveien 16 N-3440 Royken Norway. Best Regards Per From lwbyppp@epix.net Tue Feb 27 20:10:46 1996 From: timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Repeater controller speech synth chip? Date: 21 Feb 1996 13:44:37 GMT Message-ID: <4gf7k5$fgi@cloner2.ix.netcom.com> References: <4ffrl2$rvt@baleen.fore.com> <4fgp6h$719$3@mhafn.production.compuserve.com> In <4fgp6h$719$3@mhafn.production.compuserve.com> Chris Boone <72732.2610@CompuServe.COM> writes: > >The typical chips are the Texas Instruments TMS5220 (old series) >or the TI TMS50C30 (new series) and associated eproms with the >data in them... > >73 >Chris > I believe Newark Electronics still sells the National Semiconductor Digi-Talker Chip along with a development kit for adding more words From lwbyppp@epix.net Tue Feb 27 20:10:47 1996 From: jkesling@hypnos.norden1.com (John Kesling) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Schematics going to a web page Date: 22 Feb 1996 06:52:53 GMT Message-ID: <4gh3s5$eu8@news1.channel1.com> References: <4faim2$7ll$1@mhafn.production.compuserve.com> Jay Craswell (73016.27@CompuServe.COM) wrote: : Hi Kerry, there has been a lot of talk about posting schematics on the net. : Some of the talk has been how (what format) some has been a lot of bandwidth : of the legalities. I'm more interested in the how. In my mind a schematic : should be in a machine readably format that can be "used". So not in GIF, : TIFF etc type "Paint" formats. Sure you get the info from one place to anot her : but if you send me a GIF file of a really neat QRP rig that I want to build : I start by reentering it from scratch. Thus I term all paint type files as : Engineering Napkins. You know, like in the old days when the CAD operator : was a draftsman and the engineer was not involved in that stage. A better : approach is to use some electronic format that includes the parts, connectio ns : and can create a netlist. One other desired feature is ASCII format so we : can send it back and forth without UUEncoding etc. My (highly Jaded) view : is to use CIRCAD. It meets all of the above and the program also works with : OrCAD, Tango, Protel, ACAD and other files. The demo is free so everyone : can view files. The demo also lets you write (aprox 32K) files so we can I've never heard of the programs mentionied above, are they all DOS/Windows programs. I believe any format used should be universal, and not limited to a particular operating system or machine. Are all/any of the programs mentioned above available for DOS, Windows, Mac, Unix, Amiga, etc.. If not DON'T USE 'EM! There are hundreds of thousands of users on the internet that have no desire to use MS-DOS or Windows. If there is no universal format for this kind of information then the best solution would be to stick to the "universal" graphics formats. At least we ALL can use them. : all exchange small files cheaply. So, thats my 2 cents worth. Thanks for : the new WEB Site! : -- : 73, Jay WB0VNE - AAV5TH And that's my 2 cents worth. 73 - John - WA8ZGO -- jkesling@norden1.com From lwbyppp@epix.net Tue Feb 27 20:10:49 1996 From: mda@cam-orl.co.uk (Mike Addlesee) Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur Subject: Simulating old valves/tubes with FETs Date: 22 Feb 1996 17:58:32 GMT Distribution: world Message-ID: <4gias8$2m5@lyra.csx.cam.ac.uk> -- I am looking for advice on FET based equivalent circuits to replace old valves/tubes. In particular I have a National HRO-M which uses several 6C6. What are the most important characteristics that need to be reproduced? ------------- Mike Addlesee From lwbyppp@epix.net Tue Feb 27 20:10:50 1996 Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur From: dstock@hpqmdla.sqf.hp.com (David Stockton) Subject: Re: Simulating old valves/tubes with FETs Message-ID: Date: Fri, 23 Feb 1996 09:42:43 GMT References: <4gias8$2m5@lyra.csx.cam.ac.uk> Mike Addlesee (mda@cam-orl.co.uk) wrote: : -- : I am looking for advice on FET based equivalent circuits to replace : old valves/tubes. In particular I have a National HRO-M which uses : several 6C6. What are the most important characteristics that need : to be reproduced? There were various fet based valve replacements, but they never equalled the originals. Those valves ran appreciable amounts of anode power and so gave quite remarkable dynamic range. Designing a semiconductor circuit to fully equal a bottle in the same impedence environment would be a major undertaking. Power VMOS fets can do the power, but have electrode capacitances much too large to be absorbed by adjusting the coupling circuits. You could make the think work with Jfet-bipolar cascodes, but you'll lose the wonderful linearity of the HRO. Sorry, David GM4ZNX From lwbyppp@epix.net Tue Feb 27 20:10:51 1996 From: Jim Potter Newsgroups: rec.radio.amateur.homebrew Subject: Re: Tunnel diodes: are they any good? If so, any circuits out there? Date: Wed, 21 Feb 1996 20:51:20 -0700 Message-ID: <312BE838.1188@jpaw.com> References: <4gb2jb$jql@peabody.colorado.edu> <4gflu3$2de@news.ios.com> Somewhere in my collection I have an FM receiver that used a tunnel diode as a local oscillator and mixer. I believe the circuit came from the RCA tunnel diode handbook, but I forget. The IF was roughly 300 kHz and used about 4 stages of 2N1308 current switching pairs as limiters. The detector was a pulse averaging circuit. A one shot fired with a fixed width pulse at every zero crossing and the audio was obtained by passing the pulse through a low pass filter. It actually worked pretty well considering tthat it only had one inductor in the whole thing. I do remember that it was susceptible to interference from AM stations idf the antenna lead got too long. I just used the classic twin-lead folded dipole tacked to the wall. It was the source of background music in an electronics lab I worked in circa 1963. de K9GXC, Jim -- James M. Potter, President E-mail: jpotter@jpaw.com JP Accelerator Works, Inc. URL: http://www.jpaw.com/jpaw/ 2245 47th Street Voice: 505-662-5804 Los Alamos, NM 87544-1604 FAX: 505-662-5210 From lwbyppp@epix.net Tue Feb 27 20:10:52 1996 From: Peter Trapp Newsgroups: rec.radio.amateur.homebrew Subject: upd7800 Dinosaur Date: 21 Feb 1996 19:34:34 GMT Message-ID: <4gfs4a$lul@ddi2.digital.net> I am in need of a crossassembler for the NEC upd7800 microprocessor ie: ASM87-D52 no longer avaliable from NEC. Or, an op-code instruction set listing. Any help or advice you could offer would be greatly appreciated. -- ****************************************************************** * Peter Trapp (KD4CN) alpha10@digital.net * ****************************************************************** From lwbyppp@epix.net Tue Feb 27 20:10:52 1996 From: opworld@worldnet.fr Newsgroups: rec.radio.amateur.homebrew Subject: VCO question : 100 KHz deviation capability is it enough for 75KHz operation ? Date: Sat, 24 Feb 1996 10:15:59 GMT Message-ID: <4gmooj$k0q@aldebaran.sct.fr> Hi, I plan to use a hybrid VCO with 100KHz deviation capability (information from manufacturer). I design a stereo FM emetter and I need 75KHz deviation. Is it enough or do I choose a VCO with wider deviation ? Is this important for signal quality and purity ? Regards Have a nice opworld@worldnet.fr Day From lwbyppp@epix.net Tue Feb 27 20:10:53 1996 From: Jim Potter Newsgroups: rec.radio.amateur.homebrew Subject: Re: VHF LO Parasitic--common? Date: Mon, 26 Feb 1996 12:04:53 -0700 Message-ID: <31320455.3CCE@jpaw.com> References: <313100EA.2CE5@arrl.org> I have not seen this phenomena, but it is very likely with high multiplication ratios to see a component at the crystal fundamental frequency. This can be annoying also. I once had to add a high Q resonant filter after a VCXO source at 425 MHz to keep the fundamental component from getting into a wideband modulator. de K9GXC, Jim -- James M. Potter, President E-mail: jpotter@jpaw.com JP Accelerator Works, Inc. URL: http://www.jpaw.com/jpaw/ 2245 47th Street Voice: 505-662-5804 Los Alamos, NM 87544-1604 FAX: 505-662-5210 From lwbyppp@epix.net Tue Feb 27 20:10:54 1996 From: macino@mail.fwi.com Newsgroups: rec.radio.amateur.homebrew Subject: Wanted 12 Volt 4 pin vibrator Date: 23 Feb 1996 02:10:49 GMT Message-ID: <4gj7n9$l91@news.ios.com> Reply-To: macino@mail.fwi.com I came across an old Terado 12 DC to 110 AC Inverter. I believe any 4 pin (2 b ig, 2 smaller) 12 volt vibrator will switch it. Anybody got a lead on where I migh t find one? macino@mail.fwi.com aka WD9AHF From lwbyppp@epix.net Tue Feb 27 20:10:55 1996 Date: Sat, 24 Feb 1996 15:59:55 +01 From: Bob Mueller Message-ID: <96055.155955IFF161@DJUKFA11.BITNET> Newsgroups: rec.radio.amateur.homebrew Subject: Wanted-DEAD! HP(8)478A Thermistor Mount If anyone has a next to useless, burned-out, thermistor mount of the above or similar types, I would like to buy it as "Raw material" if your price matches the state of the head. Also, coaxial thermal heads of other sorts (No based on thermistors) would be interesting, even if dead. Bob From lwbyppp@epix.net Tue Feb 27 20:10:56 1996 From: mlamb@sunny.ncmc.cc.mi.us (ML, Michigan, USA) Newsgroups: rec.radio.amateur.homebrew Subject: WANTED: ICOM T21A & IC-2000H mods Date: Mon, 26 Feb 96 13:35:14 GMT Message-ID: <4gsd01$gi7@srvr1.engin.umich.edu> Please email mods to mlamb@sunny.ncmc.cc.mi.us. Thanks! 73, KB8VBA From lwbyppp@epix.net Tue Feb 27 20:10:56 1996 From: mlamb@sunny.ncmc.cc.mi.us (ML, Michigan, USA) Newsgroups: rec.radio.amateur.homebrew Subject: WANTED: ICOM T21A & IC-2000H mods Date: Tue, 27 Feb 96 13:52:07 GMT Message-ID: <4gv2bp$dej@srvr1.engin.umich.edu> Please email mods to mlamb@sunny.ncmc.cc.mi.us. Thanks! 73, KB8VBA From lwbyppp@epix.net Tue Feb 27 20:10:58 1996 From: jmatk@tscm.com (James M. Atkinson, Communications Engineer) Newsgroups: rec.radio.amateur.antenna,rec.radio.amateur.equipment,rec.radio.amateur.misc,rec.radio.amateur.digital.misc,rec.radio.amateur.homebrew Subject: Wiretapping and Telephone Bugging Web Page tscm.com Date: Sun, 25 Feb 1996 15:34:56 -0500 Message-ID: Reply-To: jmatk@tscm.com Keywords: Counterintelligence Debugging Surveillance Counter-Terrorism Finally the tools and test equipment page is finished, and we have updated our frequency tables/lists. Check out our updated tool and TSCM test equipment list. http://www.tscm.com/ http://www.tscm.com/tmde.html <--- TSCM Test Equipment http://www.tscm.com/tools.html <--- TSCM Hand Tools http://www.tscm.com/stu.html <--- Secure Telephones and Scramblers Upcoming Topics to watch for in March... Any interest?? Wired Microphones and Pinhole devices... tons of pictures The Computer Audio/Video Threat... tons of pictures Join us for a real world TSCM sweep... Feel free to suggest topics... =============================================================== James M. Atkinson "...Shaken, not Stirred..." TSCM.COM 127 Eastern Avenue #291 Gloucester, MA 01931-8008 URL: http://www.tscm.com/ E-Mail: jmatk@tscm.com =============================================================== The First, The Largest, The Most Popular, and the Most Complete TSCM Counterintelligence Site on the Internet =============================================================== From lwbyppp@epix.net Tue Feb 27 20:10:59 1996 From: Jim Strohm Newsgroups: rec.radio.amateur.homebrew Subject: Re: WTB 6,000 watt linear amp 75 meters Date: 22 Feb 1996 13:10:11 GMT Message-ID: <4ghpvj$sgv@newsgate.sps.mot.com> References: <4g8dri$hac@news-f.iadfw.net> <4g9p8k$l1b@newsbf02.news.aol.com> <4gf9co$65e@usenet.continental.com> I'm surprised that nobody has suggested AM broadcast surplus as a good source for 160 meter amplifiers. Check out a copy of Radio News. You'll pay a bunch for a working unit, but you may also get a line on a "fixer-upper" that's not quite good enough any more to run 8760 hours a year. If you can wind 1/4" copper tube around an oatmeal box, you can convert an FM broadcast transmitter to 160.... N6OTQ Flame me now and avoid the rush! From lwbyppp@epix.net Fri Mar 01 21:06:12 1996 From: Leon Heller Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: Simulating old valves/tubes with FETs Date: Thu, 22 Feb 96 23:33:54 GMT Distribution: world Message-ID: <825032034snz@lfheller.demon.co.uk> References: <4gias8$2m5@lyra.csx.cam.ac.uk> Reply-To: Leon@lfheller.demon.co.uk In article <4gias8$2m5@lyra.csx.cam.ac.uk> mda@cam-orl.co.uk "Mike Addlesee" writes: > I am looking for advice on FET based equivalent circuits to replace > old valves/tubes. In particular I have a National HRO-M which uses > several 6C6. What are the most important characteristics that need > to be reproduced? I think that QST had something on this over 20 years ago. People used to remove the glass envelope from the valve base, and the electrodes, and wire a couple of JFETs, Rs and Cs across the pins in a cascode configuration. In many cases the replacement 'valve' worked just as well as the glass variety, and didn't need any other component changes. At least one company actually manufactured such devices. 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 lwbyppp@epix.net Fri Mar 01 21:06:13 1996 From: tiemann@spot.Colorado.EDU (TIEMANN BRUCE) Newsgroups: rec.radio.amateur.homebrew Subject: tunnel diodes, to Dave Moorman... Date: 23 Feb 1996 19:16:10 GMT Message-ID: <4gl3pq$1fb@peabody.colorado.edu> Dave, K9SW: I have lost your e-mail address; please resend it. Bruce From lwbyppp@epix.net Fri Mar 01 21:06:14 1996 From: jeffd@coriolis.com (Jeff Duntemann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: 49 mhz to 6 meter conversion Date: Fri, 23 Feb 1996 21:36:37 GMT Message-ID: <4glc68$cqo@globe.indirect.com> References: <4gjsnu$3ec@news.chattanooga.net> dll@chattanooga.net (David Lawson) wrote: >I have recently read an article in the Boston Amateur radio club archives >about converting a 1 channel 49 mhz radio shack walkie talkie to a 6 meter >tranciever with a 1 repeater coverage. Does anyone know why this shouldnt >work with a simple crystal change? Has anyone done it? It might become my >next project. The only place you might trip up is not having enough "travel" on any of the little can coils to bring resonance up by the 2-3 Mhz it might take. Some of the cheapies use "naked" wire coils that you can spread out to reduce inductance, but it's not an exact science and make take some futzing. You might give it a shot and let us know how you do. --73-- --Jeff Duntemann KG7JF Scottsdale, Arizona From lwbyppp@epix.net Fri Mar 01 21:06:15 1996 From: dndshore@ix.netcom.com (David Shore) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Homebrew GPS RX Date: Sat, 24 Feb 1996 00:28:57 -0800 Message-ID: References: <31239D93.7130@CompuServe.com> Hello, I wrote the original post about a homebuilt GPS. I can't find the backlogs of the UKW berichte journal anywhere on the i-net. Is there any more detailed information you can give me about this article? In article <31239D93.7130@CompuServe.com>, 76050.1341@CompuServe.com wrote: > About 2 years ago there was a very detailed description of a > homebuilt GPS Rx in the german journal UKW-Berichte. > It went over several issues and if I remember correctly there were > detailed schematics. > The author was a very wellknown Yougoslawian amateur. > The article was in the german language. > Hope this helps > > Dietrich DJ1VA > > NB.: The rx was also suitable for GLONASS. -- *#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*#*# David and Dick Shore are very involved in computers and multimedia. David is w orking on designing robots, advertising, and programming, and Dick is excellen t on 3-D modelling programs, animations, and other computer art. -----BEGIN PGP MESSAGE----- Version: 2.6 iQB1AwUAMS0S7NZ65Qtl+dGdAQGzCAMAxyqia5NgE5FZcsup9G705fn6uIlcUF9Z xpksQVy6EyQovOfo38jiEdqF9YQ0aLV8x4xN5z9HFAeCQtq8EgcGtgSfiNC61U8h qU7f+Xo3Ng1ew1egKATrJ/wGjIghDTnT =atnu -----END PGP MESSAGE----- Thank you for whatever we discussed! $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ From lwbyppp@epix.net Fri Mar 01 21:06:16 1996 Newsgroups: rec.radio.amateur.homebrew From: "Al Koblinski (W7XA)" Subject: Re: MOSFET X-Ref: help! Message-ID: To: zimmie@gti.net References: <4ggmnn$6ia@gti.gti.net> Date: Sat, 24 Feb 1996 00:30:09 GMT These are SGS Thompson power Mosfets. You can replace with National Semi NDP4060, or Motorola MTP30n06. They are 30A, 60 Volt devices and should be available from Digikey at 1-800-344-4539. I think they have a web home page too. Regards, Al (Marketing manager for discrete transistors including the NDP4060) From lwbyppp@epix.net Fri Mar 01 21:06:17 1996 Newsgroups: rec.radio.amateur.homebrew From: "Al Koblinski (W7XA)" Subject: Re: Help with Heath VTVM!!!! Message-ID: To: af104@detroit.freenet.org References: <4gj9k5$nrs@detroit.freenet.org> Date: Sat, 24 Feb 1996 00:33:26 GMT I've had no problem with mine in 20 years. Use a standard zinc-carbon battery to calibrate it. Alkalines have slightly different voltages. If I remember correctly, you CAL to a red mark on the meter. (I'm not at home where the meter is.) Regards, Al From lwbyppp@epix.net Fri Mar 01 21:06:19 1996 From: sshumway@ix.netcom.com (Steve Shumway ) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Iron -on Transfers Date: 25 Feb 1996 02:20:55 GMT Message-ID: <4goh27$pv1@ixnews2.ix.netcom.com> References: <4gnhnb$2vm@peach.america.net> In <4gnhnb$2vm@peach.america.net> johnc@america.net (John Caramatti) writes: > >Has anyone had any good results using the Iron-on and peel transfer >papers. I believe it's call PnP Blue by a company called Techniks >Inc. If you have had experience please pass on any tips you may have. > >Thanls, John > John, I have nothing but good things to say about PnP Blue. I had some initial missgivings about it, because I had previously tried to use normal overhead transpanancy film to build a printed circuit board. This was a total failure. The difference is: the PnP Blue "film" has a coating of (big surprise) blue "stuff". This blue stuff adhears to the toner (from the laser printer, or photo copier) and adds resilience to the resist once it is stuck to the Cu. A couple of tricks: 1) Make sure that the board is absolutly CLEAN. 2) Make sure that the board is absolutly CLEAN! Even one finger print will cause the resist to transfer improperly. I finaly used a laquer thinner to get the board to that final level of clean (while wearing latex gloves). Another problem that I've had is that registration of a double sided board can be a bit tuff. Don't give up, it can be done. Several things I DON'T know: I have not as of this writing: Tried to produce a board which had traces smaller than 24 mills. Tried to run a trace between the pins of a 100 mill center component. On the whole, I am very happy with PnP Blue. I recomend it for small runs of PC boards with the above provisions. Good luck Steve Shumway N8SHP sshumway@ix.netcom.com From lwbyppp@epix.net Fri Mar 01 21:06:20 1996 From: johnsonhe@aol.com (JohnsonHE) Newsgroups: rec.radio.amateur.homebrew Subject: McCoy filters Date: 25 Feb 1996 10:40:11 -0500 Message-ID: <4gpvsr$rai@newsbf02.news.aol.com> Reply-To: johnsonhe@aol.com (JohnsonHE) Wanted to buy...McCoy Silver Sentinel or Golden Guardian crystal lattice filters. Send response to johnsonhe@AOL.com From lwbyppp@epix.net Fri Mar 01 21:06:21 1996 From: Max Lock Newsgroups: rec.radio.amateur.homebrew Subject: Re: ### KISS on a Baycom? Date: Sun, 25 Feb 1996 15:41:46 +0000 Message-ID: References: <312852fb.1d2@greenie.com> <312a704e.181@greenie.com> Hi there, Nope, as far as I know, theres no way possible to "do" a baycom on Linux, beacause it's a multithreaded OS. Baycom relies on interrupts to it's native DOS environment, and the Linux system has no way to this. I think i'm on the right path here, corect me if I'm wrong :) Max. G7UOZ & Linux fan. -- /_/_/ University of Hertfordshire ARS. ______ / /|/ / \ Callsign: G7UOZ - TCP/IP: 44.131.166.25 - AX25: G7UOZ@G6BOB.AMPR.ORG WWW: HTTP://147.197.131.75/~g7uoz/g7uoz.html - E-MAIL: M.T.Lock@herts.ac.uk |____________________________________________|______| From lwbyppp@epix.net Fri Mar 01 21:06:22 1996 From: David Nulton Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: Simulating old valves/tubes with FETs Date: 25 Feb 1996 16:05:22 GMT Message-ID: <4gq1c2$3n9@alterdial.UU.NET> References: <4gias8$2m5@lyra.csx.cam.ac.uk> To: dstock@hpqmdla.sqf.hp.com Mike: The only thing I've heard of in terms of reproducing valve effects with semiconductor equivalents has been in the music business. In that case, musicians want to duplicate the harmonic characteristics and compression of tubes. A man named Eric Pritchard had built a device the do just that. However most of his tubes are geared toward audio, particlarly the medium mu tubes like 12ax7s and at7s. He may have some 6L6 or EL34 type tubes. This probably doesn't help, but if so, mail me and I can get you in touch with Mr. Pritchard. 73s de KI5XW From lwbyppp@epix.net Fri Mar 01 21:06:22 1996 From: craigivey@aol.com (CraigIvey) Newsgroups: rec.radio.amateur.homebrew Subject: FM-10 question Date: 25 Feb 1996 18:36:21 -0500 Message-ID: <4gqrpl$7av@newsbf02.news.aol.com> Reply-To: craigivey@aol.com (CraigIvey) I have a FM-10 (rev. F) that drifts. I read in the FM-10 FAQ that the frequency selecting capacitor can be swapped out with a more stable one (tantalum, silver mica, polystyren). Also the diodes can be swapped out with a zener diode. What type of capacitor and zener diode do I need to get and where can I get it? CraigIvey@aol.com From lwbyppp@epix.net Fri Mar 01 21:06:23 1996 From: wnewkirk@iu.net (Bill Newkirk) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Re: DS-1A (DC-DC converter for Kenwood) question Date: 25 Feb 1996 22:01:38 GMT Message-ID: <4gqm82$p16@cc.iu.net> References: <4ft09j$ias@crchh327.rich.bnr.ca> Reply-To: wnewkirk@iu.net (Bill Newkirk) In , charles1@netcom.com (charles copeland) wri tes: >In article <4ft09j$ias@crchh327.rich.bnr.ca>, >Ken Edwards wrote: >>I have a Kenwood TS-820S that I would like to run off battery in ts-820...about 160 W input...pulls about 20A at 12 V.. >I've looked into this also for my TS-820. The box that connects >to the TS-820 that allows DC operation only contains a two resistors >and two mega transistors. sounds something like the supply used in the TS-520.. >The transistors are no longer in production, but the equivalent >is ZN4049, PNP germanium, 60A, 45V, TO-36, NTE28 at the tune >of $45 each. Thats $90 a pair. Not a pretty picture. > >I think it would be more feasible to buy a DC to AC converter for >your cigarette lighter plug and drive the TS-820 with 120VAC. >I would be interested in anyones experience doing this. i don't think the lighter can supply enough current for transmit. Bill Newkirk WB9IVR The Space Coast Amateur Technical Group Melbourne, FL duty now for the future of amateur radio Lombardi's 1st Law of Business: Companies succeed in spite of their best effort. If they succeed at all. From lwbyppp@epix.net Fri Mar 01 21:06:25 1996 From: timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI) Newsgroups: rec.radio.amateur.homebrew Subject: 15 pin video on laptop - Help Date: 25 Feb 1996 22:46:09 GMT Message-ID: <4gqorh$h15@cloner4.netcom.com> I've got an old laptop (386) Im going to dedicate to the ham shack, mostly to run Hamcomm, Baycomm, and perhaps JVFAX. It has a 15 pin output for a VGA monitor, since everything I'm running is CGA and even then, mostly text based I want to use an amber monitor pulled out of a terminal.(It has a really nice color to it) As best I can tell there are 3 inputs to the monitor for horz,vert, and video. (I may not have those terms correct but I know they are the minimum nessesary) I've successfully connected it to an old Sinclair Z-80, but dont want to blow the video out of the laptop. Any suggestions on which pins will provide the nessesary signals. I'm just not up on the types of signals comming from the 15 pin video out. (Can I mix RBG all together on the same pin to drive monochrome?) Thanks for any and all input. 73, Tim >ka8ddz From lwbyppp@epix.net Fri Mar 01 21:06:26 1996 From: vbook@vbook.com (Ed Mitchell) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.digital.misc,rec.radio.amateur.equipment,rec.radio.scanner,rec.radio.shortwave Subject: Free classified Ads at Ham Radio Online Date: 26 Feb 1996 04:33:49 GMT Message-ID: <4grd7d$htp@news.accessone.com> We've added free "classified" ads to our freeware Ham Radio Online international "magazine" web site. We also have original feature stories, international ham radio newsletters, broadcast/SWL info, REAL-TIME world-wide propagation resources including MUFs, aurora, geomagnetic field conditions and tons more stuff. The March stories will begin by the end of the coming weekend. Stop on by and check out the new Ham Radio Online Interactive section - where you can add your own messages and your own ads, DX announcements, VHF band openings or whatever. Please enjoy, 73, Ed, KF7VY ------------------------ personal email to vbook@vbook.com Visit Ham Radio Online, it's free, at http://www.accessone.com/~vbook/hronline.htm From lwbyppp@epix.net Fri Mar 01 21:06:27 1996 From: miker@nrv.net (Mike) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Need Recommendation for DSP Design Date: 26 Feb 1996 05:50:30 GMT Message-ID: <4grhn6$na4@kirk.nrv.net> References: In article , uid@ornl.gov says... > >I need a recommendation for a compact DSP unit for 2.7 KHz Bandwidth SSB >transceiver only. I thought about robbing a Radio Shack unit of the components >needed just for my homebrew application. > >Any recommendations for DSP chips which already have the code in them and I >can design around them? > >Danny Britton >qb7@ornl.gov > It really depends on the application you are planning in your tranceiver. I use the Ti Tms320C50 DSK for some voice applications but it is crippled by the slow sample rate analog interface. It is priced at $99.00 and includes a simple assembler and debugger. Although the price is fair the Motorola 56002EVM is a better deal at about $150.00. This is a 24 bit processor running at 50Mhz with the Crystal semi. analog interface. It samples up to 48khz opposed to 19khz (I think for the Ti). It comes with a nice assembler with a lot of internal functions and the Domain Tech. Debugger. I have sent requests for help to both companies and only got answers to them from Motorola. The Motorola is also stereo which probably won't effect your application. The Ti's interface with the host computer is a very simple one and not nearly as nice as the 56002EVM. Ti does have an EVM for the C50 also but I don't think it will compete in price with the 56002 because I got a $100.00 coupon toward it with the dsk and you normally don't get a 100 dollar coupon for a 150 dollar item. The Analog Devices starter kit is also priced low but when I checked out their dsp products you had to buy the reference books from a 3'rd party and Ti and Motorola books are free for the asking. From lwbyppp@epix.net Fri Mar 01 21:06:28 1996 From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: Iron -on Transfers Date: Mon, 26 Feb 96 09:30:29 PDT Message-ID: References: <4gnhnb$2vm@peach.america.net> <4goh27$pv1@ixnews2.ix.netcom.com> > > Another problem that I've had is that registration of a double sided > board can be a bit tuff. Don't give up, it can be done. > > The standard technique for double sided boards is to tape both the top and bottom films (transfer films with pattern on them) to a piece of pcb material so that the pattern on the films is off the edge of pcb material.. When taping the second film onto the pcb material carefully align the two layers. Then simply slide the pcb material that you want to etch between the two films and butt upto the other piece of material. For extra safety in handling, you can then tape the films to the work piece. This method works well for photo exposure but should work equally well for dry transfer. Jay From lwbyppp@epix.net Fri Mar 01 21:06:29 1996 Newsgroups: rec.radio.amateur.homebrew From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Need Recommendation for DSP Design Message-ID: <1996Feb26.151137.2238@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) References: <4gq1pn$3n9@alterdial.UU.NET> Date: Mon, 26 Feb 1996 15:11:37 GMT In article <4gq1pn$3n9@alterdial.UU.NET> David Nulton writes : >For audio DSP - the Texas Instruments TMS320C(10,20,30) chips are >the best (IMHO). There is also a large collection of TMS320 >programs and discussion associated with audio filters and other >DSP stuff. As far as a DSP chip with stuff already in it, I don't >know of any. You must write a program, assemble and program the >chip. > >For assembly, TASM is a freeware assembler that handles the 320 in >addition to other popular uPs. I believe the EEPROM version of >the TMS320 can be adapted to a 27c256 or simular EEPROM >programmer. If you really want to get into it, TI offers some >development kits with already assembled boards and PC software to >plug and play you programs for about $100 if I remember correctly. The TI chip is good, but I think the Analog Devices chipset is even better, and the development kit is $89. (As a bonus, this chipset is used on some soundcards for the PC, which is really convienent if you're doing a demodulator for digital data or an audio spectrum analyzer or FAX or SSTV or whatever, and will be interfacing to a PC anyway.) Gary -- Gary Coffman KE4ZV | You make it, | Due to provider problems Destructive Testing Systems | we break it. | with previous uucp address es 534 Shannon Way | Guaranteed! | Email to ke4zv@radio.org Lawrenceville, GA 30244 | | From lwbyppp@epix.net Fri Mar 01 21:06:30 1996 From: "joseph c. hawkins" Newsgroups: rec.radio.amateur.homebrew Subject: Pager Problems Date: 26 Feb 1996 17:21:32 GMT Message-ID: <4gsq6s$emt@tel.den.mmc.com> Does anyone have any info (schematics) on Pagecom or Minitor II pagers? Our Vol service has several in need of repair and any info would be appreciated. Thanks Joe From lwbyppp@epix.net Fri Mar 01 21:06:31 1996 From: Steve Benkoski Newsgroups: rec.radio.amateur.homebrew Subject: Re: 813 Xmtr for 160M Date: Mon, 26 Feb 1996 18:09:29 -0500 Message-ID: <31323DA9.1499@en.com> References: <1996Feb13.172422@atl.com> <2a6.8518.546@acenet.com> Brian Carling wrote: > > From: brian.carling@acenet.com > "mail sometimes bounces here, please resend if needed!" > > I once had an ART-13 - got it free at a hamfest, built a 28V DC supply > for the autotune and put it on the air! Had a ball with it! > > FAIR RADIO is listed in my file MEGALIST.TXT aka MEGALIST.ZIP > available as follows: > > Updated copies downloadable from BBSes at: > (301) 681-7782, (301) 942-2218, (301) 299-3292, (301) 563-1306 > (301) 417-6952, (202) 619-1494, (202) 208-7679 > > FTP site is at ftp.Lehigh.EDU. Login as anonymous, and use your > e-mail address as the password. > FTP: ftp://ftp.lehigh.edu/pub/listserv/qrp-l/misc/megalist.txt > WWW: http://qrp.cc.nd.edu/QRP-L/index.html > WWW: http://www.nd.edu/~shideg/ > > megalist.txt > manuals.txt > dealers.txt > tubes.txt > xtals.txt > ======== > > LD>> Fair Radio in Lima Ohio has the ART-13 available in surplus again for $ 150 > LD>It covers 2-18 Mhz > LD>> (and is easily re-worked for 160 thru 10 meters) and uses an 813 modula ted > LD>with a pair of > LD>> 811's. You might have more fun rebuilding the ART if you just want to r un > LD>the 813's! > > LD>Hey, I had one of these things many years ago. Watching the autotune > LD>operate is more fun than a barrel of monkeys. What's the address for > LD>Fair Radio? > > LD>Larry ************************* > > The Evolution of Contemporary Thought: > > ----> McHale's Navy -> > -> Mikhail Gorbachev -> > ----------> Al Gore -> > -------> Gore Vidal -> > ----> Vidal Sassoon........ > > A natural progression! > > --- > þ SLMR 2.1a þHey, I managed to get 7 ART-13A's! 5 of them in near mint cond ition,two of them for parts. Also have a DRAKE 110vac power supply for the ART-13A. I will trade of 3 of the nice ones in exchange for more old HF stuff. Any takers? Mark Foltarz KA4JVY From lwbyppp@epix.net Fri Mar 01 21:06:32 1996 Newsgroups: rec.radio.amateur.homebrew From: choffman@pelican.davlin.net (Charles Hoffman) Subject: Re: Need Globar Resistor Info Message-ID: Date: Mon, 26 Feb 1996 18:25:23 GMT Reply-To: choffman @pelican.davlin.net References: You should contact The Carborundum Company, Electric Products Division, Box 664, Niagara Falls, NY 14302; phone 716.278.2521 or fax ...2298. Note, there are hundreds of types of non inductive resistors, so you will no doubt need to have some specific applications in mind as you persue information; otherwise you may get burried! 73 Ric K5SBU jackg@xetron.com (Jack Giehl) wrote: >Hi, >I am looking for a supplier or an address/phone number for >Globar resistors. >Thanks, Jack, WB8BFS From lwbyppp@epix.net Fri Mar 01 21:06:34 1996 From: nigel@ndavison.demon.co.uk (Nigel Davison) Newsgroups: rec.radio.amateur.homebrew Subject: Necessary Bandwidth Date: Mon, 26 Feb 1996 20:57:26 GMT Message-ID: <825368159.4254@ndavison.demon.co.uk> Hi, Can somebody explain to me exactly what is meant by necessary bandwidth and how it is calculated, or is it just another way of expressing the conventional 3dB bandwidth?. My understanding is that it is the necessary bandwidth required to enable satisfactory reception of a modulated signal. If this is so then is there an equation to calculate it?. Thanks Nigel From lwbyppp@epix.net Fri Mar 01 21:06:34 1996 From: Roger L Traylor Newsgroups: rec.radio.amateur.homebrew Subject: Plessey SL6440 - near end of life? Date: 27 Feb 1996 01:45:38 GMT Message-ID: <4gtno2$km3@news.jf.intel.com> I have heard that the SL6440 balanced mixer made by GEC Plessey is to be discontinued soon. Has anybody heard any statement or rumor to this effect? Any suggestions for a replacement in the future? Thanks, Roger Traylor WB4TPW From lwbyppp@epix.net Fri Mar 01 21:06:35 1996 From: gherbst@msn.com Newsgroups: sci.astro.amateur,rec.radio.amateur.space,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.antenna Subject: [Q] Frequency of Jupitor emissions Date: Tue, 27 Feb 96 13:51:35 PDT Message-ID: Hi All: Anyone know what frequence emissions from Jupitor may be picked up on. Also, is there equipment that can be bought or built cheaply to do such. As I recall I thought I saw mentioned in a trade rag 18Mhz - 22Mhz... Thanks, Gary- From lwbyppp@epix.net Fri Mar 01 21:06:36 1996 From: tlabrier@minor.rnet.com (Terry LaBrier) Newsgroups: rec.radio.amateur.homebrew Subject: Site for Mods Date: Tue, 27 Feb 1996 14:34:54 GMT Message-ID: <4gv6ua$v5e@golden.adams.net> Once, while surfing the Ham Radio Sites, I ran across a site for Mods for Kenwoods, etc. I have lost that site. I would appreicate knowing what sites may be out there for mods to ICOMS and Kenwoods. Thanks and 73. Terry *************************** * Terry LaBrier, N0AHY * * tlabrier@minor.rnet.com * *************************** From lwbyppp@epix.net Fri Mar 01 21:06:37 1996 From: sarnold@nbed.nb.ca (Scott Arnold) Newsgroups: rec.radio.amateur.homebrew Subject: 11 to 6 Meter?? Date: Tue, 27 Feb 96 15:58:44 GMT Message-ID: <4gv9if$sld@darwin.nbnet.nb.ca> Anyone know if it's possible to convert CB's to 6 meters? And if so, some examples of model numbers and where the surgical information may be obtained in order to do so. Many thanks. Scott VE1CSA C. Scott Arnold New Brunswick Department Of Education Technical Support sarnold@nbed.nb.ca (506) 453-2319 **OPINIONS EXPRESSED IN THIS MAIL ARE MINE, NOT MY EMPLOYERS'** From lwbyppp@epix.net Fri Mar 01 21:06:39 1996 From: Jim Devenport Newsgroups: rec.radio.amateur.homebrew Subject: Re: 11 to 6 Meter?? Date: Tue, 27 Feb 1996 16:39:36 -0700 Message-ID: <31339638.5033@lanl.gov> References: <4gv9if$sld@darwin.nbnet.nb.ca> To: Scott Arnold Years ago I converted a Gemtronics 23-channel SSB CB to 6 meters. I had the SAMS manual and thus could calculate the necessary crystal to provide a mix to 50 MHZ. I only installed 1, giving me 4 channels of 50 MHZ starting at 50.100, ch2 50.110, ch3 50.120, and ch4 50.140. I had to solder the crystal directly to the PC board close to the oscillator transistor instead of the normal crystal socket to get it to oscillate. Transmitter tuneup consisted of replacing the capacitors in the output circuit with 50% or smaller values, and as I recall a couple of stages tuned up best with the parallel capacitors removed altogether. Also seems like I had to rework at least 2 or 3 coils in the recv circuits, RF preamp and 1st mixer, using an exacto knife to remove the tiny caps imbedded in the base of the plastic coil forms inside the cans, perhaps removing a few turns of wire from the coils too. It wasn't a trivial project but the cost in bucks was VERY low, the rig is still operational 10-15 yrs later (loaned out to a more active 6M ham now) but time involved was the big cost. If I was to do it again I think I'd try the external transverter approach (such as the Hamtronics 80 dollar kit) instead. I am not the only nut to have done this; I worked another 6M ham once with it who was running a similar CB rig! Power output was close to 5 watts SSB when I got thru with it; the receiver was not quite so hot and required the addition of a 40673-style preamp to get the sensitivity up to acceptable levels. I submitted an article to all the ham mags at the time (early '80's) about the project but evidently they all thought it too involved too and rejected it. I think I could find the unpublished article in my files if you decided you really wanted to tackle the job. I think it would be best to attempt it on one of the older simpler rigs. If I had a more modern "sympathized" CB rig I would sure think the best way would be to use an external transverter. -- |-------------------------------------------------------| |Jim Devenport WB5AOX | |All Standard Disclaimers Disclaimed | |My views rarely (if ever) reflect those of my employers| |HTTP://nis-www.lanl.gov/~jdport/ | |-------------------------------------------------------| From lwbyppp@epix.net Fri Mar 01 21:06:40 1996 From: lhalliday@creo.bc.CA Newsgroups: rec.radio.amateur.homebrew Subject: re: Homebrew GPS RX Date: 27 Feb 96 16:47:54 GMT Message-ID: <9601278254.AA825439962@mail.creo.bc.ca> In an earlier article David Shore asked: > Hello, I wrote the original post about a homebuilt GPS. I can't find > the backlogs of the UKW berichte journal anywhere on the i-net. > Is there any more detailed information you can give me about this > article? I've never heard of UKW-Berichte being on the net (anybody? Ich spreche wenig Deutsch...), but the international edition, VHF Communications, is very much on the net. Visit: http://www.taynet.co.uk/~gdx/ag/vhfcomm.htm The full title of the series of articles is "A DIY Receiver for GPS and GLONASS Satellites". Say hi to Mike. Subscribe (Americans do it through ATV Quarterly) - it's a neat magazine! Laura Halliday VE7LDH "C'est une femme mutine, assez lhalliday@creo.bc.ca elegante, grave et legere, ayant le ve7ldh@amsat.org sens du confort et du plaisir Locator: CN89mg en tout." - C. Deneuve From lwbyppp@epix.net Fri Mar 01 21:06:41 1996 From: Dave Booth Newsgroups: rec.radio.amateur.homebrew Subject: Re: Site for Mods Date: Tue, 27 Feb 1996 17:54:33 -0800 Message-ID: <3133B5D9.2781@pactitle.com> References: <4gv6ua$v5e@golden.adams.net> To: Terry LaBrier Terry LaBrier wrote: > > Once, while surfing the Ham Radio Sites, I ran across a site for Mods > for Kenwoods, etc. I have lost that site. I would appreicate knowing > what sites may be out there for mods to ICOMS and Kenwoods. Thanks > and 73. > Terry > > *************************** > * Terry LaBrier, N0AHY * > * tlabrier@minor.rnet.com * > *************************** here is the sight you prob were in..... http://oak.oakland.edu:8080/pub/hamradio it's the best i've seen... 73 de dave booth. kc6wfs http://www.lookup.com/Homepages/65348/home.html From lwbyppp@epix.net Fri Mar 01 21:06:42 1996 From: skorzep@magicnet.net (Stan Korzep) Newsgroups: rec.radio.amateur.homebrew Subject: TM231: where is memory battery? Date: 28 Feb 1996 00:41:34 GMT Message-ID: <4h08bu$shs@comet2.magicnet.net> Does anyone know where inside the Kenwood TM231A 2 meter transciever the battery used for memory power is located? Appreciate any help and any suggestions on how to remove front PC board if battery is located on that board. Stan skorzep@magicnet.net From lwbyppp@epix.net Fri Mar 01 21:06:43 1996 From: jmf@visi.com (Joe Fishbein) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where to find RF Chokes? Date: Wed, 28 Feb 1996 03:07:06 GMT Message-ID: <4h0g1l$mfu@news.visi.com> References: <4gsjqb$mks@daryl.scsn.net> Reply-To: jmf@visi.com gss@scsn.net (Greg Snellgrove) wrote: >I am building a 50s/60s vintage tube-type cw transmitter and after a long >hard parts search, I finally have all the parts I need except for the rf >chokes. I have called everywhere I knoe to call and have not had any >luck. What I need is 1 1.0mH RFC such as a Miller 4652-E and 2 2.5 mH >RFCs such as the Miller 4666-E. I have found out that these are still >being made by Miller, but the best source I have found so far would have >to order me 25 of each at $3.90 a piece! There has to be someplace to buy >small quantities of these. Any source you know of would be greatly >appreciated. Ocean State Electronics has the 4666 in their catalog, priced at $4.30 each. They don't show the 4652, but you might call them and see if they carry it. They also carry the Miller 70F- series of RF chokes, priced from $1.10 to $3.55 each, depending on inductance. Ocean State Electronics PO Box 1458 Westerley, RI 02891 (401) 596-3080 or 1-800-866-6626 (order line) (401) 596-3590 fax Hope this helps. 73s, Joe Fishbein WD9GRK jmf@visi.com From lwbyppp@epix.net Fri Mar 01 21:06:44 1996 From: "David W. Knisely" Newsgroups: sci.astro.amateur,rec.radio.amateur.space,rec.radio.amateur.misc,rec.radio.amateur.homebrew,rec.radio.amateur.equipment,rec.radio.amateur.antenna Subject: Re: [Q] Frequency of Jupitor emissions Date: 28 Feb 1996 05:49:22 GMT Message-ID: <4h0qd2$p2u@iac2.ltec.net> References: To: gherbst@msn.com Hi there. The Decameter radio bursts do not stay on a particular frequency. They are quite broad banded and move in frequency as time goes on. 22 Mhz is a goo d place to look, but it also has some broadcast stations on when the ionosphere is refractive to those freqencies. It is best heard on a broad band AM shortwave receiver with a directional antenna (like a Yagi or a loop) pointed at Jupiter . The emissions are very irregular, and seem to be most often observed when the moon IO is in certain positions around the planet. David Knisely, Prairie Astronomy Club, Inc. From lwbyppp@epix.net Fri Mar 01 21:06:44 1996 From: bycheung@asiaonline.net (Barry Cheung) Newsgroups: rec.radio.amateur.homebrew Subject: Homebrew GPS receiver? Date: 28 Feb 1996 06:26:53 GMT Message-ID: <4h0sjd$d14@news.asiaonline.net> Would like to have information on making a GPS receiver by my own. Thanks for helping anyway. From lwbyppp@epix.net Fri Mar 01 21:06:45 1996 From: paul1@news.sfu.ca (Paul Erickson) Newsgroups: rec.radio.amateur.homebrew Subject: vfo230 - ts830s cable? Date: 28 Feb 1996 07:08:33 GMT Message-ID: <4h0v1h$1cb@morgoth.sfu.ca> I'm having trouble tracking down a cable for the vfo230 - ts830s combo. Has anyone had any experience building one? cheers, Paul ve7cqk email: paul1@wizard.ucs.sfu.ca From lwbyppp@epix.net Fri Mar 01 21:06:47 1996 Newsgroups: rec.radio.amateur.homebrew From: morris@grian.cps.altadena.ca.us (Mike Morris) Subject: Re: Homebrew earphone - Mike Message-ID: <1996Feb28.075301.19659@grian.cps.altadena.ca.us> References: <4grm8r$gi3@newsbf02.news.aol.com> <4gsejk$f2l@reader2.ix.netcom.com> Date: Wed, 28 Feb 1996 07:53:01 GMT timhynde@ix.netcom.com(Tim Hynde ka8ddz/qrp Rochester, MI) writes: >In <4grm8r$gi3@newsbf02.news.aol.com> mvenable@aol.com (MVenable) writes: >> >>I want to use my 2-meter HT while motorcycle mobile. I also wear a full >>face helmet. The helmet speaker/microphone conversions are pretty pricey. >>I've seen ads for earphones that work as mikes (also expensive). Seems >>like a good do-it-yourself project. Does anyone know how to homebrew an >>earphone-mike that will work under the helmet? >> >>Thanks and 73 >> >>Mark Venable N1RSK >> >Hi Mark: >I used to ride and had a Bell full face, I used a simple electret mike >element glued into the chin portion of the helment, the speaker used >was a simple 2" flat style I picked up at a hamfest. I did have to dig >out a little of the cushion inside the helmet. >The most unique portion however was a differential circuit made which >took the input from another mike element mounted on the side of the >helmet just under the lip. With motor noise comming into both elements >the differential circuit only passed my voice to the rig (Well not 100% >obviously) but WOW what a difference! Without it there was too much >engine noise to have a decent QSO. >The rest was just simple switching, I ran the PTT to a snap action >micro-switch near the horn. Hope this gives you some ideas. Good Luck Years ago I ran a Honda twin with a 2m and 220mhz mobile. I took the starter button wires, ran them to a 3P3T switch, and ran one side to the starter, the other side to the radio. The switch was mounted by the right mirror on a small bracket that I made out of cheap angle iron. For a microphone I mounted a electret cartridge in the chin piece foam on a Bell clone helmet, and for received audio I had an earphone. Make sure your radio unhooks the built in mic cartridge when the external in plugged in - some don't. For the antenna I glued a length of enameled wire to the edge of the fairing windscreen. Later on I put a Larsen motorcycle antenna (1/2 wave - no ground plane) on a saddlebag top. 2m on the left, 220mhz on the right. Sample schematic: 0-------radio 220mhz PTT circuit +----------------------0---->0----original bike starter wiring starter ! 0-------radio 2m PTT circuit button ! ! ! ! ! 0-------radio 220m PTT circuit +----------------------0---->0----original bike starter wiring ! 0-------radio 2m PTT circuit ! ! 0------- 220mhz radio fused 12v ------0---->0---- green light (i.e. engine start) 0------- 2m radio -- --- Mike Morris morris@grian.cps.altadena.ca.us #include I have others, but this works the best. This message assembled from 100% recycled electrons (and pixels). From lwbyppp@epix.net Fri Mar 01 21:06:48 1996 From: daly@eagle.rtc-waterford.IE (progen et2) Newsgroups: rec.radio.amateur.homebrew Subject: WARP WAS-1 AUTO-SWR SCHEMATICS Date: 28 Feb 96 12:47:56 GMT Message-ID: <9602281247.AA12763@eagle.rtc-waterford.ie> I HAVE A WARP WAS-1 AUTO-SWR METER (THE ONE WITH REMOTE SENSORS) SOME OF THE WIRES INSIDE IT HAVE BEEN CUT AND I HAVE NO REMOTE SENSORS (YOU HAVE TO HAVE REMOTE SENSORS BECAUSE IT HAS NO OTHER SOCKETS) I WAS WONDERING IF ANYBODY COULD GET SCHEMATICS FOR IT! I WOULD REALLY LIKE TO FIX IT...I AM WILLING TO COVER ANY COPYING AND POSTAGE OR ANY OTHER COSTS. SORRY FOR ADDING EXTRA MAIL TO THE LIST! THANKS IN ADVANCE WARREN EI6ETB daly@eagle.rtc-waterford.ie ps. I might be able to build the remote sensors? after I fix the other bits.. From lwbyppp@epix.net Fri Mar 01 21:06:49 1996 From: mlamb@sunny.ncmc.cc.mi.us (ML, Michigan, USA) Newsgroups: rec.radio.amateur.homebrew Subject: WANTED: ICOM T21A & IC-2000H mods Date: Wed, 28 Feb 96 13:11:35 GMT Message-ID: <4h1kbs$7ir@srvr1.engin.umich.edu> Please email mods to mlamb@sunny.ncmc.cc.mi.us. Thanks! 73, KB8VBA From lwbyppp@epix.net Fri Mar 01 21:06:50 1996 From: ddiamond@TRL.OZ.AU (Drew Diamond) Newsgroups: rec.radio.amateur.homebrew Subject: Marconi Signal Generator Date: Wed, 28 Feb 1996 13:24:46 Message-ID: Keywords: signal generator Looking for operator's/service manual- or at least circuit schematic, for Marconi Signal Generator, 10 kHz - 72 MHz, model TF144H/(4S) (military CT452A). Any assistance would be greatly appreciated. All costs refunded. 73, Drew Diamond, VK3XU. From lwbyppp@epix.net Fri Mar 01 21:06:50 1996 From: "Tom V. Pfaffenbach" Newsgroups: rec.radio.amateur.homebrew Subject: FRANKFURT VLF TIME STANDARD Date: 28 Feb 1996 13:42:19 GMT Distribution: usa Message-ID: <4h1m3r$gpg@kocrsv08.delcoelect.com> In regard to a posting by Alain Chabas - The best VLF receivers that I have come across are the surplus Selective Voltmeters sold by Fair Radio out of Lima,Ohio, USA. I have a Hewlett-Packard 312B that I use on the HF bands 1.5-18 Mhz, and which I have occasionally tuned across the 10Khz to 500Khz range. There are a number of stations sending 3 letter morse identifiers in that region. I have not heard any time broadcasts - at least not in anything like the NIST-WWV format. 73 - K9JDU From lwbyppp@epix.net Fri Mar 01 21:06:51 1996 From: Clifford Buttschardt Newsgroups: rec.radio.amateur.homebrew Subject: Re: MOSFET X-Ref: help! Date: Wed, 28 Feb 1996 15:08:55 -0800 Message-ID: References: <4ggmnn$6ia@gti.gti.net> <4gj93f$gbu@news.iii.net> Both Samsung and IRC make this same unit. It is very commonly used Cliff Buttschardt W6HDO On 23 Feb 1996, Thomas C. J. Sefranek wrote: > Try MTP30N06 > > Motorola > > See the Motorola Power FETs web site for specifications > > Tom > > > > From lwbyppp@epix.net Fri Mar 01 21:06:52 1996 From: Bert Burland Newsgroups: rec.radio.amateur.homebrew Subject: 40/80m QRP CW kit? Date: Wed, 28 Feb 1996 15:57:37 -0800 Message-ID: <3134EBF1.645B@arn.net> Looking for leads to a QRP CW kit or construction plans for the same. Prefer tubes and easy to follow instructions for a rank neophyte. :) Any suggestions for reading materials? /Bert - N5TOA From lwbyppp@epix.net Fri Mar 01 21:06:53 1996 From: Ps7ab@pcimage.UCSD.EDU (Ps7ab) Newsgroups: rec.radio.amateur.homebrew Subject: Unsubscribe Date: 28 Feb 96 22:35:04 GMT Message-ID: <977_9602290330@pcibbs.com> unsubscribe * Sent via SFE-mail from [UNREGISTERED BBS] From lwbyppp@epix.net Fri Mar 01 21:06:54 1996 From: hepc@earthlink.net (Todd Owen) Newsgroups: rec.radio.amateur.equipment,rec.radio.amateur.homebrew Subject: IC-245 and HTX-100 LSB mods needed Date: Thu, 29 Feb 1996 00:38:02 GMT Message-ID: <4h2sf2$9cg@argentina.it.earthlink.net> I am looking the add LSB reception to my ICOM IC-245 2m and RS HTX-100 10m rigs for satellite downlinks. --73, Todd KE4UDN ----------------------------------------------------------------- Todd Owen Hanover Engineers, P.C. Richmond, VA 804-730-0011 ke4udn@amsat.org ----------------------------------------------------------------- From lwbyppp@epix.net Fri Mar 01 21:06:55 1996 Newsgroups: rec.radio.amateur.homebrew From: butler@ee.tcd.ie Subject: Re: 567 Tone Decoder Help Needed Message-ID: Date: Thu, 29 Feb 1996 15:09:01 GMT In article , jason.goldring@sheridanc.on.ca (Jason Goldring) writes: >I have been trying to set up a 567 tone decoder to install inside an old Motorola radio, and >I wish to set it's center frequency to 151.4 Hz (A CTCSS tone). After reviewing several articles >on how to implement the 567, I still cannot get it to decode the input tone. > >I realize that the formula is roughly Fo=1.1/(R x C) for determining the center frequency, >so from this formula, I have determined that a 0.47uf capacitor and a 25k variable resistor >for R and C would be sufficient, as I could tune the 567 to lock onto the exact frequency, but >this is where my problem starts. I have the earphone jack from my scanner plugged into >the 567 circuit, and decoupled with a .01uf capacitor. The output of the 567 is simply a >red LED, for testing purposes. When I transmit from my portable, the scanner receives >it, but the LED does not light up, regardless on where the variable resistor is set at. >If the VR is set right to one end, though, the LED lights when I transmit, bu t it is not >from the tone-in fact, I can turn the scanner off and transmit, and the LED will light. >Pretty weird. The schematic I used was based on the RAMSEY TD-1 tone decoder >kit. I have checked and double checked my wiring, as well as making another one, >and it does the same. Any suggestions? > >Thanks in advance! >Jason. > > Can't comment on the operation of the circuit but CTCSS tones are usually sub-audible. Does you receiver have a high-pass filter in the audio output which prevents the CTCSS tone appearing at the earphone jack. ?? Dr. Gerry Butler, CEng. MIEE. [butler@ee.tcd.ie] TELTEC-TCD (Radio Propagation Planning), Trinity College,Dublin 2,Ireland Dept. of Electronic and Electrical Engineering, [ Dublin+Wicklow Mountain Rescue / EI0CH / EMT-D ] From lwbyppp@epix.net Fri Mar 01 21:06:56 1996 From: gmp@tl.KRakow.PL (Grzegorz Brzozowski) Newsgroups: rec.radio.amateur.homebrew Subject: Schematy Date: 29 Feb 96 16:42:08 GMT Message-ID: Czy moglbys mi wyslac jakies informacje o schematach, ktore posiadasz(o sprzecie domowej konstrukcji). GMP@tl.krakow.pl From lwbyppp@epix.net Fri Mar 01 21:06:57 1996 From: mikemr (Michael Mraz) Newsgroups: rec.radio.amateur.homebrew Subject: Radiokit Date: 29 Feb 1996 17:48:31 GMT Message-ID: <4h4otf$onv@news.microsoft.com> Has anyone tried to call them lately? Their line has been continually busy for the past 2 days. I'm trying to find out the status of their 9-band SB-220 mod kit, if anyone knows. tnx 73 Mike N6MZ mikemr@microsoft.com -- The opinions expressed in this message are my own personal views and do not reflect the official views of Microsoft Corporation. From lwbyppp@epix.net Fri Mar 01 21:06:58 1996 From: n7ws@azstarnet.com (Wes Stewart) Newsgroups: rec.radio.amateur.homebrew Subject: Re: advice needed on homebrew ATU Date: Thu, 29 Feb 1996 19:28:25 LOCAL Message-ID: References: <4h4kam$kb3@frigate.doc.ic.ac.uk> In article <4h4kam$kb3@frigate.doc.ic.ac.uk> Paris Michael Andreou writes: >From: Paris Michael Andreou >Subject: advice needed on homebrew ATU >Date: 29 Feb 1996 16:30:14 GMT >Dear all, >hello. To all the hi-power experts out there: >I want to construct an ATU, handling up to 1KW. I started searching for > capacitors, but I am not sure what to look for. How does the voltage >rating and/or spacing of air-caps relate to power handling? >I was recently reading an article on atu construction tips, and the author >suggested that for severe mismatches at high power , the RF across a cap in a >T-match could be up to 5000V. (the article was from a US amateur, so I take >hi-power to be 1.5KW).So, if I understand well, the degree of mismatch you wa nt >your ATU to handle is also a critical factor in the voltage tolerance. Yes the mismatch makes a significant difference and it is not just the SWR that matters, but what the impedance is that causes the SWR. A tuner might handle a much higher mismatch in one area of the Smith chart than another. > Any advice from the gurus on how to pick the capacitors? Is there data in th e > literature I can look it up? If you can find or afford them, vacuum capacitors are the way to go. The voltage ratings are high, there are no sliding contacts and the minimum capacitances are low. > Another thing: can capacitors with the same spacing have different voltage > rating? I have seen adverts of 2mm spacing capacitors with ratings of 4KV an d > 7.8KV. It doesn't look reasonable. It's possible. It can depend on the thickness of the plates and their finish. Thicker plates with radiused and polished surfaces will withstand higher voltage before breakdown than will thin stamped plates with rough, sharp surfaces and edges. The insulation supporting the fixed plates is a factor too. You must not forget the inductor either. Most of the loss in a well-designed tuner will occur here. Regards, Wes -- N7WS From lwbyppp@epix.net Fri Mar 01 21:06:59 1996 From: "Charles R. Patton" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Iron -on Transfers and two layer register techniques Date: 29 Feb 1996 21:32:39 GMT Message-ID: <4h561n$kp5@gatekeeper.wdc.com> References: <4gnhnb$2vm@peach.america.net> <4goh27$pv1@ixnews2.ix.netcom.com> There is still the chance of mis-registering when taping the sheets to the 'PC B spacer. The method I used to use was to purchase a pair of "register pins" (t hese are 1/4" stainless steel posts attached vertically to thin, flat stainless steel sheets about 1" square and are available from commercial graphic art supply ho uses. They are used to register separation negatives during the graphics arts reprod uction process.) Take your sheets and register them in contact. Temporarily tape th em together. Now using a standard 1/4" hole punch, either single hand operated o r 3-hole, simultaneously punch at least two holes in a common edge of the films. Now remove the tape and make up a 'PCB spacer' with enlarged holes at the position of the film holes. Now stack up as follows: Tape 1st film layer to PCB with punch h oles beyond edge. Turn over, insert register pins, and drop on 'PCB spacer' and 2n d film layer. Tape 2nd layer to PCB. The register pins are perpendicular to the surface, so eliminate potential p arallax errors in conjunction with the 'PCB spacer'. With this technique you can easi ly achieve a few mills of registration. Also as a side note, the register pins come in two flavors: totally round po sts and and ones that are flattened. For really high accuracy one round, and one or t wo flattened units are used together. This allows the different pieces of film t o expand or shrink slightly without causing buckling which would lead to poor contacts . Unfortunately to use the flattened units requires an expensive punch. However the effect can be duplicated by using two round register pins, and elongating one of the holes in the film parallel to the edge. (Think about it for awhile -- its a k inematic problem.) Hope this made sense. Charles R. Patton patton_c@a1.wdc.com From lwbyppp@epix.net Fri Mar 01 21:07:00 1996 Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc From: midgard@nycmetro.com (SARUMAN) Subject: CB conversion for HAM use? Message-ID: <707.6633T987T1350@nycmetro.com> Date: Thu, 29 Feb 1996 21:38:12 GMT Howdy folks, I was just going thru some of my stuff and found my old Walkie T' s Both are 3 channel 3 watt units. one Lafayette one Radio Shack. Is it possable to get Crystals for Frequencies other thatn the 40 CB Channels for use with these units? Any other Mod's needed? Thanx for the help folks. The Crystals in these are socketed if that matters. I've been out of this for Years. Midgard Graphics 3D Animation and Special FX for the hobbyist videographer Email: midgard@nycmetro.com -- Drop into #amigacafe on IRC's undernet for a chat sometime -- A man of many hobby's master of none. From lwbyppp@epix.net Fri Mar 01 21:07:01 1996 From: Michael Petzold Newsgroups: rec.radio.amateur.homebrew Subject: What does GaAs-FET cost? Date: 29 Feb 1996 22:14:07 GMT Message-ID: <4h58ff$n77@helios.herts.ac.uk> I've got a circuit diagram of a LNC, and its input stage is fitted with a Mitsubishi MGF1502, a single-gate GaAs-FET. I couldn't find any GaAs components in my catalogs (RS, Farnell), so my question is: What (approx.) does such a device (or a similar one) cost? The text said it was a cost-effective device, but I got no clue what the usual prices are. (The same circuit uses a CF300 dual-gate GaAs tetrode. How much does this cost?) Thanks! Michael From lwbyppp@epix.net Thu Mar 07 10:02:05 1996 From: Zack Lau Newsgroups: rec.radio.amateur.homebrew Subject: VHF LO Parasitic--common? Date: Sun, 25 Feb 1996 19:38:02 -0500 Message-ID: <313100EA.2CE5@arrl.org> I recently noticed a low level parasitic on a VHF crystal oscillator based on the no-tune designs. Seems that if the transistors have enough gain at audio frequencies, the parallel inductor that tunes out the crystal's shunt capacitance can form an audio feedback path. The cure is simple--add a small value capacitor in series to block the audio signal, yet pass the desired VHF signal. The spur is easier to see if the oscillator is multiplied by a large number--with a 24 times multiplier the +/- 930 Hz spurs were about 60 dB down. I wonder if other people have noticed similar problems? Maybe with similar circuits in more critical applications where the spurs might be a real problem? Zack KH6CP/1 zlau@arrl.org From lwbyppp@epix.net Thu Mar 07 10:02:06 1996 From: pdrunen@aol.com (PDRUNEN) Newsgroups: rec.radio.amateur.homebrew Subject: DTMF FTP SITE Date: 25 Feb 1996 23:33:42 -0500 Message-ID: <4grd76$d8j@newsbf02.news.aol.com> Reply-To: pdrunen@aol.com (PDRUNEN) Special thanks to everyone that asked for a copy of my DTMF program. I have made the DTMF program available at my ftp site. You can still request it by e-mailing me at PDRUNEN@AOL.COM. To get there ftp to users.aol.com login as "ftp" Password as "your e-mail address" then cd /pdrunen then cd /dtmf get dtmf_v11.exe. You will also find a really nice windows based GIF viewer, VUGRAF13.ZIP for the taking. From lwbyppp@epix.net Thu Mar 07 10:02:08 1996 From: thomas.g.booth@den.mmc.com (Booth, Thomas G) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Help with Heath VTVM!!!! Date: 26 Feb 1996 06:01:19 GMT Distribution: usa Message-ID: References: <4gj9k5$nrs@detroit.freenet.org> In article <4gj9k5$nrs@detroit.freenet.org>, af104@detroit.freenet.org (Jeffrey L. Bauman) wrote: > > I'm having the dumb problem of not being able to swing the > needle all the way over to the 1.5V marker by adjusting the DC > calibrate pot. All wiring is correct, and the 12AU7 is just > fine. Jeff, when you say the 12UA7 is "just fine", does this mean you checked it with a tube tester? If you did use a tube tester, was it a dynamic transconductance type (Military TV-7, Hickok 538, etc.) or the old GOOD-?-BAD style emission tester so popular in Radio Shack stores 20 years ago? If your 12AU7 has low transconductance in either triode section, you may not have enough differential gain to get full scale deflection on the meter. > Double checked the wiring - it's correct, with no apperent > cold solder joints. Correct components in place. > I wired this myself recently, and just cant "calibrate" the > meter. I don't think Heath has made any VTVM kit for some years now. Assuming your kit sat unbuilt on someone's shelf for a long time, there's a slight chance that the fixed resistors used on the plate and cathode sides of the 12AU7 may have gone out of tolerance. A quick check w/ a friend's ohmmeter should be able to check this possibility out. > Anyone know of any mods / errata on this VTVM? it > 's the wide one with the large meter. The box pivots in a > "U" shaped mounting bracket. I'm personally not aware of any errata w/ your VTVM...I'd think it unlikely though, as the circuitry in your meter has gotta be almost identical w/ what's in the IM-18 I built over 20 years ago. FWIW there have been a few aftermarket mods for the Heath and other similar topology VTVMs from other manufacturers, most notably the battery eliminator circuits intended to replace the D cell w/ a regulated 1.5 volt DC source. Heath for a time in the '70s offered a solid state conversion kit for their VTVMs as well; this kit consisted of two custom modules which replaced the 6AL5 & 12AU7, along w/ a resistor mod to the diode bleeder string. > Probe is fine. 1.5V voltage source fine. This is stupid, but > just can't get it to calibrate! Oh, one last thing - have you checked the various voltages in the VTVM against the values printed on the schematic? > Thanks, > Jeff > WB5KZW Good luck - TGB \\ The opinions expressed herein are my own. // From lwbyppp@epix.net Thu Mar 07 10:02:09 1996 From: Jay Wicklund Newsgroups: rec.radio.amateur.homebrew Subject: Re: 15pin video, want to use old monitor Date: Mon, 26 Feb 96 09:19:28 PDT Message-ID: References: <4gnt6c$jip@cloner2.ix.netcom.com> > just not up on the types of signals comming from the 15 pin video out. > > Thanks for any and all input. > > 73, Tim > ka8ddz > You didn't say which brand laptop you were using, but most manuals include pin out information in the back of the manual. In any case, my Zeos has the following pinout and it should be standard since all the monitors work interchangably. pin1 Red signal pin2 Green signal pin3 Blue signal pin4 MS2 pin5 Ground pin6 R ground pin7 G ground pin8 B ground pin9 reserved pin10 ground pin11 MS0 pin12 MS1 pin13 Horizontal sync pin14 Vertical sync pin15 not used MS0 - MS2 are inputs to the computer provided by the display to indicate what type of display is connected. I don't know the codes off hand. But the signals, I think, are simply open or grounded. Also as you can see there is no simple composite video, or combined intensity signal. Unless one of the MS codes makes the display go into a monochrome mode, you will have to pick one of the colors as your output (probably green). Hope this is a start, but you'll hopefully get a few more clues somewhere else. 73....KI7RH From lwbyppp@epix.net Thu Mar 07 10:02:11 1996 From: pjml@swmis.nsw.ac.uk (Pete Morgan-Lucas) Newsgroups: rec.radio.amateur.homebrew,uk.radio.amateur Subject: Re: Simulating old valves/tubes with FETs Date: 26 Feb 1996 09:51:08 GMT Distribution: world Message-ID: <4grvqc$a4r@kwuz.nerc-keyworth.ac.uk> References: <4gias8$2m5@lyra.csx.cam.ac.uk> Mike Addlesee (mda@cam-orl.co.uk) wrote: : -- : I am looking for advice on FET based equivalent circuits to replace : old valves/tubes. In particular I have a National HRO-M which uses : several 6C6. What are the most important characteristics that need : to be reproduced? : ------------- : Mike Addlesee There's something on this in mid-sixties versions of the RSGB "Amateur Radio techniques" books. Some guy replaced the RF amp and oscillator/mixer of an Eddystone S640 with 2N3819-type devices. Personally, i consider this sacrilege, like making plasticene arms and sticking them to the Venus de Milo and calling it an improvement... //Pete Morgan-Lucas// G6WBJ NERC Computer Services From lwbyppp@epix.net Thu Mar 07 10:02:11 1996 From: gss@scsn.net (Greg Snellgrove) Newsgroups: rec.radio.amateur.homebrew Subject: Where to find RF Chokes? Date: 26 Feb 1996 15:32:27 GMT Message-ID: <4gsjqb$mks@daryl.scsn.net> I am building a 50s/60s vintage tube-type cw transmitter and after a long hard parts search, I finally have all the parts I need except for the rf chokes. I have called everywhere I knoe to call and have not had any luck. What I need is 1 1.0mH RFC such as a Miller 4652-E and 2 2.5 mH RFCs such as the Miller 4666-E. I have found out that these are still being made by Miller, but the best source I have found so far would have to order me 25 of each at $3.90 a piece! There has to be someplace to buy small quantities of these. Any source you know of would be greatly appreciated. 73, Greg, KN4NO From lwbyppp@epix.net Thu Mar 07 10:02:13 1996 From: "Tom V. Pfaffenbach" Newsgroups: rec.radio.amateur.homebrew Subject: Re: Tunnel diodes: are they any good? If so, any circuits out there? Date: 26 Feb 1996 15:58:14 GMT Distribution: usa Message-ID: <4gslam$l8r@kocrsv08.delcoelect.com> References: <4gb2jb$jql@peabody.colorado.edu> Tunnel Diodes demonstrate negative resistance as the forward voltage increases. Although they can be designed for sizeable currents, the power level is limited by the low (typically tenths of a volt) level at which the quantum tunneling effect is demonstrated. Hewlett Packard used tunnel diodes for UHF/SHF oscillators and low-level amplifiers in some instruments 3 decades ago, but the Gunn diode and small geometry devices fill most applications today. The quantum tunneling effect, like magnetic polarization, is probabilistically instantaneous and has no upper frequency limit. To demonstrate the effect, connect the diode to parallel resonant circuit having d.c. continuity and bias the device into the forward region. In the negative resistance region, oscillations will begin, and sustain. From lwbyppp@epix.net Thu Mar 07 10:02:14 1996 Newsgroups: rec.radio.amateur.homebrew From: choffman@pelican.davlin.net (Charles Hoffman) Subject: Re: Ideas on a power antenna Message-ID: Date: Mon, 26 Feb 1996 18:37:53 GMT Reply-To: choffman @pelican.davlin.net References: <4gg0i6$qat@remus.rutgers.edu> Ok on your Lincoln. You can slot tune the rear window with a small tuning network mounted on one side behind the rear seat. Less ingnition noise in the rear. Good luck. hillgen@remus.rutgers.edu (Fender) wrote: >Here's my idea. I have a Lincoln Continental that I'm absolutely in love >with and I really would like to have my 2m radio in it but I'm not too eager >to slap a mag-mount on it or even (gasp) drill holes in it so i have an idea >for a compromise. How feasable would it be to build some sort of matchbox >so that I could run realtively low power (50 watts or less) at good SWR >through the power antenna used for the FM stereo. I figure that if it works, > I'd mount a second in the fender and it could retract out of the way when >not in use. I figure that it would have a good ground plane but how >would I achieve a good match? All advice appreciated! If this idea doesn't >work out, anybody have any others for a rather inconspicuous antenna? > > Thanks! > Jay > N2OTK From lwbyppp@epix.net Thu Mar 07 10:02:15 1996 From: hanavin@stimpy.eecis.udel.edu (Chuck Hanavin) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where to find RF Chokes? Date: 26 Feb 1996 21:12:17 GMT Message-ID: <4gt7nh$me4@louie.udel.edu> References: <4gsjqb$mks@daryl.scsn.net> In article <4gsjqb$mks@daryl.scsn.net>, Greg Snellgrove wrote: >I am building a 50s/60s vintage tube-type cw transmitter and after a long >hard parts search, I finally have all the parts I need except for the rf >chokes. I have called everywhere I knoe to call and have not had any >luck. What I need is 1 1.0mH RFC such as a Miller 4652-E and 2 2.5 mH >RFCs such as the Miller 4666-E. I have found out that these are still >being made by Miller, but the best source I have found so far would have >to order me 25 of each at $3.90 a piece! There has to be someplace to buy >small quantities of these. Any source you know of would be greatly >appreciated. > >73, >Greg, KN4NO > > Try Mouser Electronics (1-800-346-6873). They sell 2.5 mh chokes, similar to the J.W. Miller 4600 series. They cost $2.53 @ quanities of one, and have no minimum order. Good luck with the rig, I am building a 2e26 rig for 80m, maybe we'll cross wires. 73, Chuck (WB3FJJ) From lwbyppp@epix.net Thu Mar 07 10:02:16 1996 From: yee@mipg.upenn.edu (Conway Yee) Newsgroups: rec.radio.amateur.homebrew Subject: kits for HF rigs (QRO or QRP) Date: 26 Feb 1996 23:04:03 GMT Distribution: world Message-ID: I would like to build an HF rig. Sadly, Heath is no longer around. Ideally, I would like to build a rig that is in the 100Watt class. Am I mistaken that no such kits are bing sold nowadays and that I would have to build from scratch if I wanted to build such a kit? In the QRP class, I would like to build both CW and SSB rigs. What is out there that is multi-band? I have written for information about the Sierra from NorCal and now Wilderness. What other CW rigs should I be looking at? How about SSB rigs? -- | 73 de Conway Yee, N2JWQ | DON'T | EMAIL : yee@mipg.upenn.edu | TREAD | TELEPHONE : | ON | FAX : | ME! From lwbyppp@epix.net Thu Mar 07 10:02:17 1996 From: glenne@sr.hp.com (Glenn Elmore) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Necessary Bandwidth Date: 27 Feb 1996 16:14:57 GMT Message-ID: <4gvam1$o15@canyon.sr.hp.com> References: <825368159.4254@ndavison.demon.co.uk> Nigel Davison (nigel@ndavison.demon.co.uk) wrote: : Hi, : Can somebody explain to me exactly what is meant by necessary : bandwidth and how it is calculated, or is it just another way of : expressing the conventional 3dB bandwidth?. : My understanding is that it is the necessary bandwidth required to : enable satisfactory reception of a modulated signal. If this is so : then is there an equation to calculate it?. : Nigel I suppose the term might be construed to mean "how much spectrum a particular modulated signal occupies" using a 3 dB-down or 26 dB-down or some other measure but my normal understanding of it would relate to how much spectrum is necessary for a given signalling rate (baud). The Nyquist bandwidth deals with how much spectrum is required for a particular signalling rate but the *information* bandwidth depends upon S/N as described by Shannon. See my ARRL conference paper: ftp://col.hp.com/hamradio/packet/n6gn/arrlcnc/cnc.html and select the paper "Physical Layer Considerations in building an Amateur Radio Network" if you would like more details. Glenn n6gn From lwbyppp@epix.net Thu Mar 07 10:02:19 1996 From: mgarrett@prairienet.org (Mark A. Garrett) Newsgroups: rec.radio.amateur.homebrew Subject: Re: FM-10 question Date: 27 Feb 1996 16:39:16 GMT Message-ID: <4gvc3k$p1p@vixen.cso.uiuc.edu> References: <4gqrpl$7av@newsbf02.news.aol.com> Reply-To: mgarrett@prairienet.org (Mark A. Garrett) In a previous article, craigivey@aol.com (CraigIvey) says: >I have a FM-10 (rev. F) that drifts. I read in the FM-10 FAQ that the >frequency selecting capacitor can be swapped out with a more stable one >(tantalum, silver mica, polystyren). Also the diodes can be swapped out >with a zener diode. > >What type of capacitor and zener diode do I need to get and where can I >get it? > >CraigIvey@aol.com > The capacitors you can get from Newark but you will have to deal with a minimum order (I believe around $25). You should be able to pick up the caps at a local electronic parts dealer if you have one in your area. You might also be able to pick up the 3 volt zener there too. I did have one question, what type of container do you have your FM-10 in? If you have it in the plastic one that Ramsey supplies it helps but if it is in a metal box and the antenna is brought out thru a connector and mounted away from other metal objects (and humans-they tend to cause possible detuning) that might help. Other items to note would be if you are using batteries or a regulated power supply. I have a friend I built one of these for and he is using the Ramsey supplied case, a regulated power supply and has mounted on a shelf. He never turns the unit off and has had no problems with keeping the unit stable. In fact I have not reset it for him in over a year now. -- Mark Garrett mgarrett@prairienet.org KA9SZX @ N9LNQ.#ECIL.IL.USA.NOAM From lwbyppp@epix.net Thu Mar 07 10:02:19 1996 Newsgroups: rec.radio.amateur.homebrew From: gary@ke4zv.atl.ga.us (Gary Coffman) Subject: Re: Necessary Bandwidth Message-ID: <1996Feb27.170413.7681@ke4zv.atl.ga.us> Reply-To: gary@ke4zv.atl.ga.us (Gary Coffman) References: <825368159.4254@ndavison.demon.co.uk> Date: Tue, 27 Feb 1996 17:04:13 GMT In article <825368159.4254@ndavison.demon.co.uk> nigel@ndavison.demon.co.uk (N igel Davison) writes: > >Can somebody explain to me exactly what is meant by necessary >bandwidth and how it is calculated, or is it just another way of >expressing the conventional 3dB bandwidth?. My books say that it is the bandwidth where the signal energy has fallen 22 db from peak, or alternately, the bandwidth that contains 99% of the signal energy of the emission, whichever is greater. 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 lwbyppp@epix.net Thu Mar 07 10:02:20 1996 From: tmaldred@mail.comox.island.net (Thomas M. Alldread) Newsgroups: rec.radio.amateur.homebrew Subject: DDS VFO Date: Tue, 27 Feb 1996 17:50:42 GMT Message-ID: <31334283.68225857@news.comox.island.net> Greetings to everyone that reads this: I am wondering if anyone can recommend a single unit quantity source for the Harris Semiconductor HSPA5102 DDS and CA3338 DAC chips that are utilized in the DIGIVFO and DIGIBRAIN QST articles. Digikey does not carry the DDS but does have the DAC. I would like to build my own variation of the DDS thus do not wish to buy one of the kits as offered in the articles. 73 de VE7TMA E-mail: tmaldread@mail.comox.island.net packet: VE7TMA@VE7KGW.#NVI.BC.CAN.NA From lwbyppp@epix.net Thu Mar 07 10:02:21 1996 From: vinyn1vc@aol.com (VINY N1VC) Newsgroups: rec.radio.amateur.homebrew Subject: Need 1n78 point contact mixer diodes Date: 28 Feb 1996 12:13:06 -0500 Message-ID: <4h22f2$qcm@newsbf02.news.aol.com> Reply-To: vinyn1vc@aol.com (VINY N1VC) For my old HP-8551 spectrum analyzer. If you have any I could sure use them. Thanks beforehand -Viny Coppola From lwbyppp@epix.net Thu Mar 07 10:02:22 1996 From: vinyn1vc@aol.com (VINY N1VC) Newsgroups: rec.radio.amateur.homebrew Subject: Need attenuator for HP8551 Date: 28 Feb 1996 12:22:27 -0500 Message-ID: <4h230j$qhr@newsbf02.news.aol.com> Reply-To: vinyn1vc@aol.com (VINY N1VC) The attenuator is for my deceased one in my HP 8551 spectrum analyzer. It is an "N" coaxial type and it covers from 10 mhz to 10ghz. I guess any substitute could be pressed into service. Because of its age I will take what I can get. Thanks beforehand -Viny Coppola From lwbyppp@epix.net Thu Mar 07 10:02:24 1996 From: vinyn1vc@aol.com (VINY N1VC) Newsgroups: rec.radio.amateur.homebrew Subject: Need microwave attenuator Date: 28 Feb 1996 12:45:21 -0500 Message-ID: <4h24bh$quf@newsbf02.news.aol.com> Reply-To: vinyn1vc@aol.com (VINY N1VC) The attenuator is for my deceased one in my HP 8551 spectrum analyzer. It is an "N" coaxial type and it covers from 10 mhz to 10ghz. I guess any substitute could be pressed into service. Thanks beforehand -Viny Coppola From lwbyppp@epix.net Thu Mar 07 10:02:25 1996 From: dave@diusys.cms.udel.edu (Dave Dabell) Newsgroups: rec.radio.amateur.homebrew Subject: Re: TM231: where is memory battery? Date: 28 Feb 1996 15:16:57 GMT Message-ID: <4h1rl9$r6i@news.udel.edu> References: <4h08bu$shs@comet2.magicnet.net> Just did this last weekend. Yes, the battery is mounted on the back of the front panel pc board, wedged between the board and the chassis. Snap off the front panel plastic, remove knobs, remove nuts from the mike connector and freq knob. Then remove clear plastic piece and then the sheet metal shield. After all this you can remove board, battery is on the back. Sheet metal has screws at the side that hold it on. The clear plastic snaps on kinda like the front panel. Thanks, kenwood for making it SO easy.. Instead of ordering a replacement from kenwood's parts subcontractor, I got one from digi-key. I hear you can also order one from radio shack 73, dave wa3u Stan Korzep (skorzep@magicnet.net) wrote: : Does anyone know where inside the Kenwood TM231A 2 meter transciever : the battery used for memory power is located? : Appreciate any help and any suggestions on how to remove front PC board : if battery is located on that board. : Stan : skorzep@magicnet.net From lwbyppp@epix.net Thu Mar 07 10:02:26 1996 From: simcock@adam.com.au (ian simcock) Subject: Help: Radio Design Newsgroups: rec.radio.amateur.homebrew Summary: Keywords: Message-ID: <313473cd.0@eden.adam.com.au> Date: 28 Feb 96 15:25:01 GMT I posted this before, but I didn't get any respose, so I'm trying again. I'm hopeing that someone could point me to either 1) An Internet site with circuit diagrams 2) A book with appropriate circuits 3) A person who could design an appropriate circuit 4) A company that sells what I want. What I need is a small radio that fits the following specs - 1) Any frequency (preferably an unlicenced piece of spectrum) 2) Digital transmition of 500 bytes per second 3) 200 meter range under bad indoor conditions 4) Digital tuning 5) Runs on 4-6 volts 6) Low power consumption 7) Rapid startup/shut down for the transmiter 8) 10 channels If possible I'd like the following improvements 1) 1000+ bytes per second 2) 500+ meter range 3) Run on 3-6 Volts 4) 30+ channels 5) Able to easily transmit analogue (voice) signals 6) Full duplex opperation (Able to transmit and recieve at the same time) Thanks for reading this far. I'd appriciate any help anyone can give me, Ian Simcock. From lwbyppp@epix.net Thu Mar 07 10:02:27 1996 From: cnc23a@b4pph13e.bnr.ca (Ken Edwards) Newsgroups: rec.radio.amateur.homebrew,rec.radio.amateur.misc Subject: Whatever happened to AC-SSB ?? Date: 28 Feb 1996 15:51:55 GMT Distribution: world Message-ID: <4h1tmr$n7p@crchh327.rich.bnr.ca> A few years ago ther was alot of talk about Amplitude Compandored Single-Side Band communications. Haven't heard much about it lately. Any pointers on info ? -- ====================================================================== Ken M. Edwards, PE Nortel, Research Triangle Park, NC (919) 905-4769 email: cnc23a@bnr.ca All opinions are my own and do not necessarily reflect the views of my employer or co-workers, family, friends, congress, or president. From lwbyppp@epix.net Thu Mar 07 10:02:28 1996 From: jblane01@harris.com (James Blaney) Newsgroups: rec.radio.amateur.homebrew Subject: Help needed Date: Wed, 28 Feb 1996 16:38:53 LOCAL Message-ID: Hi folks, I’am new here so forgive me if I sound stupid. Does anyone have details on how to build a “ very basic “ Short-wave Reviver ( Crystal set type of thing ). Any details on WWW sites, Kit’s, any informatio n at all would be appreciated. ----------------------------------------------------------------- James Blaney Why is the universe here ? Harris Ireland. Why ?, where else would it be ! ----------------------------------------------------------------- Fax : Intl. + 353 42 32532 Call : Intl. + 353 42 35401 E-Mail : jblane01@harris.com These are my opinions, and not those of Harris Semiconductor. ----------------------------------------------------------------- From lwbyppp@epix.net Thu Mar 07 10:02:29 1996 From: Ps7ab@pcimage.UCSD.EDU (Ps7ab) Newsgroups: rec.radio.amateur.homebrew Subject: Unsubscribe Date: 28 Feb 96 22:35:00 GMT Message-ID: <975_9602290330@pcibbs.com> unsubscribe * Sent via SFE-mail from [UNREGISTERED BBS] From lwbyppp@epix.net Thu Mar 07 10:02:30 1996 From: ericness@aol.com (EricNess) Newsgroups: rec.radio.amateur.homebrew Subject: 567 Tone Decoder Help Needed Date: 29 Feb 1996 01:36:44 -0500 Message-ID: <4h3hhs$g06@newsbf02.news.aol.com> References: Reply-To: ericness@aol.com (EricNess) From your description, it is clear that RF is getting into your circuit. This explains why the LED lights even when the power is turned off. The best way to keep the RF out would be to mount the circuit inside the scanner. Keep all the leads short and be sure to bypass the power line (.001 uF should work fine.) On the other hand, I can see two other possible pitfalls so it would be best to get the circuit working first before building it in. If you transmit into a dummy load, there should be enough signal for your scanner but not enough to mess up the 567. Now for other pitfalls...It is quite possible that frequencies below 200Hz are filtered out and therefore will never make it to the earphone jack. If such is the case, you will need to get the audio right after the discriminator. The discriminator level audio may need additional amplification to work with the 567. Pitfall number 2 involves the input signal. 567s don't lock very well if there is noise on the signal (like voice). The best way to fix this is to filter out the noise. A simple lowpass filter with a cutoff freq of 200 Hz should do. An 8 pin dual opamp will do the trick nicely, one amp for the low pass filter and the second amp to raise the voltage level. From lwbyppp@epix.net Thu Mar 07 10:02:32 1996 From: mwcook@cris.com (Mike Cook - AF9Y) Newsgroups: rec.radio.amateur.misc,rec.radio.amateur.homebrew,aus.radio.amateur.misc,uk.radio.amateur Subject: The Weak Signal Challenge - 1 Year, No Winner Date: 29 Feb 1996 03:18:01 GMT Message-ID: <4h35t9$b5t@spectator.cris.com> The Weak Signal Challenge - 1 Year, No Winner For the last year, I have sponsored a weak signal contest from my web page (http://www.webcom.com/~af9y/). Hundreds have attempted to extract the call of this weak Morse code signal using various signal processing techniques. So far, all have failed. I know it is possible to extract the call letters using a combination of signal processing and the "ears" of a well trained operator. I am now increasing the prize to $100 for the first correct identification of the calling station. I believe the winner will have to break new ground in signal processing techniques. I've made available a text list of all possible calls to neutralize any recognition advantage that an experienced operator would have. The challenge is a one minute digitized recording of a weak moonbounce signal. The Morse code signal is just above the noise but is strong enough to allow copy of my call letters (AF9Y) near the middle of the one minute period. The mystery station is sending a simple repeat of his call and my call. The characters "DE" may or may not be between the two calls. The file is called unkn422.wav and is available from: http://www.webcom.com/~af9y Additional information is available in the web page. de Mike, AF9Y http://www.webcom.com/af9y Work: mwcook@itt.com Home: mwcook@cris.com From lwbyppp@epix.net Thu Mar 07 10:02:33 1996 From: hamop@aztec.asu.edu (CHARLES J. MICHAELS) Newsgroups: rec.radio.amateur.homebrew Subject: Source of MMICs Date: 29 Feb 1996 03:59:24 GMT Message-ID: <4h38as$sp7@news.asu.edu> Can anyone suggest source in small quantities of Avantec MSA cascadable MMICs or equivalent devices? Specifically the Avantec MSA 0685 or equivalent. I used these in the *Null Steerer* of my QST article in July 1994 p 29 but have no response now from the sourvce mentioned in my article. Charlie, W7XC -- From lwbyppp@epix.net Thu Mar 07 10:02:35 1996 Distribution: world Newsgroups: rec.radio.amateur.homebrew From: brian.carling@acenet.com (Brian Carling) References: Date: Thu, 29 Feb 1996 12:19:00 -0500 Subject: kits for HF rigs (QRO or Message-ID: <2a6.8723.546@acenet.com> From: brian.carling@acenet.com "mail sometimes bounces here, please resend if needed!" Hi COnway... if you want to build kits try looking up all of the suppliers in MEGALIST.TXT (see below) CY>I would like to build an HF rig. Sadly, Heath is no longer around. CY>Ideally, I would like to build a rig that is in the 100Watt class. Am CY>I mistaken that no such kits are bing sold nowadays and that I would CY>have to build from scratch if I wanted to build such a kit? CY>In the QRP class, I would like to build both CW and SSB rigs. What is CY>out there that is multi-band? I have written for information about CY>the Sierra from NorCal and now Wilderness. What other CW rigs should CY>I be looking at? How about SSB rigs? CY> | 73 de Conway Yee, N2JWQ | DON'T Updated copies downloadable from BBSes at: (301) 681-7782, (301) 942-2218, (301) 299-3292, (301) 563-1306 (301) 417-6952, (202) 619-1494, (202) 208-7679, (301) 933-8251 FTP site is at ftp.Lehigh.EDU. Login as anonymous, and use your e-mail address as the password. FTP: ftp://ftp.lehigh.edu/pub/listserv/qrp-l/misc/megalist.txt WWW: http://qrp.cc.nd.edu/QRP-L/index.html WWW: http://www.nd.edu/~shideg/ DOWNLOAD as MEGALIST.ZIP or individually as: megalist.txt manuals.txt dealers.txt tubes.txt xtals.txt ======== * SLMR 2.1a * I gave my argument to the judge, Tom said briefly. From lwbyppp@epix.net Thu Mar 07 10:02:36 1996 From: redbone@juno.COM (Douglas R Davis) Newsgroups: rec.radio.amateur.homebrew Subject: Linear Amp Modifications? Date: 29 Feb 96 14:14:55 GMT Message-ID: <199602291444.GAA00993@UCSD.EDU> How much trouble would it be to modify an amp made for use between 3-30 MHz, for use on, say...75 meters? Is it possible or economically feasible? Thanks. From lwbyppp@epix.net Thu Mar 07 10:02:37 1996 From: bob@waterw.COM (Bob Applegate) Newsgroups: rec.radio.amateur.homebrew Subject: Can anyone ID these IF amps? Date: 29 Feb 96 20:38:08 GMT Message-ID: <9602292038.AA08525@water.waterw.com> Last night I picked up some IF amps at our club's White Elephant sale. They have RCA part numbers, but none of the retired RCA guys at the meeting had any idea what they were for. Markings are: LOG IF AMPLIFIER RHG ELECTRONICS LAB (15286) MODEL NO. ICL60G23EA RCA CORP P/N 5616449-5 The connectors are labeled: IF IN, -15V, RET, +15V, TP1, VID 1, VID 2, TP2. The price was right (25 cents each), so it was worth the gamble that they might be something interesting. Any info about specifications would be appreciated! Tnx Bob - WA2ZZX Bob Applegate, bob@waterw.com Water Wheel Systems 35A East Main Street, Suite 10 Marlton, NJ 08053 609-596-0032 From lwbyppp@epix.net Thu Mar 07 10:02:38 1996 From: gary Newsgroups: rec.radio.amateur.homebrew Subject: Re: Linear Amp Modifications? Date: 29 Feb 1996 22:52:03 GMT Message-ID: <4h5amj$ms4@miwok.nbn.com> References: <199602291444.GAA00993@UCSD.EDU> Either this guy doesn't proofread his messages, or somehow has failed to realize that 75 meters is *already* within the 3-30 mhz range... -- Gary.... *** I AM THE NRA! *** From lwbyppp@epix.net Thu Mar 07 10:02:39 1996 From: jeffd@coriolis.com (Jeff Duntemann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Direct conversion Date: Thu, 29 Feb 1996 23:04:16 GMT Message-ID: <4h2n4l$moo@globe.indirect.com> References: clifto@indep1.chi.il.us (Clifton T. Sharp) wrote: >I've decided to try to design a MW broadcast-band receiver (at least in >part to bolster my meager analog design skills), and it occurred to me >that I might like to try using direct conversion. You sound like you're way ahead of me on this one in terms of engineering skills, but as I understand it, DC receivers don't work with AM signals such as you'd find on the MW broadcast band. I've managed to listen to AM SW on the several DC boxes I've built, but I had to zero beat them very carefully. It's unclear how to get rid of the heterodyne in a DC design.... ...but if there's a way, boy, I'd love to learn about it! --73-- --Jeff Duntemann KG7JF Scottsdale Arizona From lwbyppp@epix.net Thu Mar 07 10:02:40 1996 From: jeffd@coriolis.com (Jeff Duntemann) Newsgroups: rec.radio.amateur.homebrew Subject: Re: Where to find RF Chokes? Date: Thu, 29 Feb 1996 23:21:10 GMT Message-ID: <4h2o4d$npb@globe.indirect.com> References: <4gsjqb$mks@daryl.scsn.net> gss@scsn.net (Greg Snellgrove) wrote: >I am building a 50s/60s vintage tube-type cw transmitter and after a long >hard parts search, I finally have all the parts I need except for the rf >chokes. If you're doing Glowbug work, you should have both the Fair Radio Sales catalog (Lima, Ohio) and that of Antique Electronics Supply (Tempe, Arizona.) Both are long-time mail order firms with wonderful reputations, and I've bought a lot of stuff from them. Antique Electronic Supply is at (602) 820-5411; Fair Radio Sales is at (419) 223-2196. DC Electronics here in Scottsdale has a good catalog with Miller chokes, tho they're not heavy into tube stuff. Call them and get their catalog: (800) 423-0070. More and more people seem to be building with tubes. It's a neat trend. I like radio parts that are big enough to see. --73-- --Jeff Duntemann KG7JF Scottsdale, Arizona