John,
I am not a big fan of Johnson VFO's, but they are definately a step up over Heath with the VF-1. So in the spirit of "tongue in cheek", the easiest way to FS a Johnson VFO is to plate modulat the rig! Actually that comment might apply more to an Appache, then a Valiant. On the more serious side, diode (6AL5) switching may be fine for a fixed downward shift. You could also add a FM reactance modulator, and key the input voltage between two pre-determind DC levels. I once used a W6SAI reactance modulator (6BA6) in a HEATH VF-1. Had to regulate everything including the filaments (on pure DC) to minimize drift, and FM from 60 hz. This worked great until the mechanical aspects of my VF-1 degraded such that the contacts were all shot, and frequency hopping was the result. That VF-1 was personally delivered to the landfill with a swift kick.. I spent way too much time on the POS. :-( Good luck with your project, Regards, Jim Candela WD5JKO --- John Lawson <[EMAIL PROTECTED]> wrote: > > If anyone has any direct experience with modding > the Johnson Valiant (or > similar VFO) for 'real' FSK - I'd be very interested > to hear of your > methods / results. > > I have a few ideas, and BTW I intend to use a > vacuum tube to accomplish > this, to maintain it's boatanchor status. While > there is plenty of audio > advice concerning Valiants, I've yet to come up with > any concrete info on > wiggling the VFO with my Mod. 19. I have a couple > of Dovetrons to do AFSK > - but I'd really like to just feed the Valiant a > sample of the local loop > current and make it deedle-deedle that way. > > > Cheers > > John KB6SCO > ______________________________________________________________ > AMRadio mailing list > Home: > http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net >
