Steve, What about some of us AM'ers that have a sub-audible frequency shift with modulation due to poor power supply regulation, and decoupling? This is pretty common with some of our "cherished" vintage equipment. It does have a beneficial effect though in that it when strong discourages a SSB station from trying to zero beat. The famous BC-375 with a MO-PA arrangement had some audio rate FM as did the BC-223 that I once had (801 osc + 801 PA modulated with PP 46's). I believe "Timtron" Wa1HLR once had a BC-375 that he used as the "SBE rig". SBE stood for "side band eliminator". I had dinner once with Tim 20+ years ago where he described a TPTG 450th oscillator on 75 meters AM, FM, PM, or just "all modulation". He said it sure cleared out the frequency, and sounded great on a wide band AM receiver.. These examples may be illegal, but...
Regards, Jim WD5JKO -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Mike Dorworth, K4XM Sent: Wednesday, December 22, 2004 8:01 PM To: Discussion of AM Radio Subject: Re: [AMRadio] Lowest level modulation Hi , it is illegal to use a modulated oscillator below about 2 meters. It will work but adds FM even to a crystal oscillator. In fact commercial vhf equipment using crystals actually phase modulate the crystal oscillator to get FM. They of course go through several multiplications to get the plus and minus 5 kc deviation.. That's kHz for youngsters!.. The rules simply state NO!..hope this helps.. Mike K4XM ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, December 22, 2004 8:51 PM Subject: [AMRadio] Lowest level modulation > Hi All: > > As I understand it, low level modulation is anything prior to the amp. > > Therefore, is it possible to modulate the grid oscillator RF input signal - > crystal or otherwise - and expect an AM output? > > Next question: how? > > Regards, > Steve > WA2TAK > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > > > > -- > No virus found in this incoming message. > Checked by AVG Anti-Virus. > Version: 7.0.298 / Virus Database: 265.6.4 - Release Date: 12/22/2004 > > -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.298 / Virus Database: 265.6.4 - Release Date: 12/22/2004 ______________________________________________________________ AMRadio mailing list Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.296 / Virus Database: 265.6.4 - Release Date: 12/22/2004 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.296 / Virus Database: 265.6.4 - Release Date: 12/22/2004
