[Milsurplus] Re: Use of an external VFO with a BC-610 transmitter?

[Roger Basford]

----- Original Message ----- > ------------------------------
>
> Message: 6
> Date: Mon, 31 Dec 2007 11:40:34 -0500
> From: "C. Whitaker" <whitaker at pa.net>
> Subject: Re: [Milsurplus] Use of an external VFO with a BC-610
> transmitter?
> To: milsurplus at mailman.qth.net
> Message-ID: <47791B82.8080803 at pa.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> de WB2CPN
> In USAF I've used the Meisner Signal Shifter fed straight into
> one of the the BC-610 crystal sockets.   Try not to set the
> oscillator on the top of the BC-610.  Gets too hot.
> 73  Clete
>
>
>
>
> ------------------------------
>
> Message: 7
> Date: Mon, 31 Dec 2007 11:56:00 EST
> From: WA5CAB at cs.com
> Subject: Re: [Milsurplus] Use of an external VFO with a BC-610
> transmitter?
> To: milsurplus at mailman.qth.net
> Message-ID: <d45.1bc1752d.34aa7920 at cs.com>
> Content-Type: text/plain; charset="us-ascii"
>
> After Korea, the Navy installed BC-610's in some Reserve Centers and 
> Training
> Facilities.  They had a rather nice outboard VFO custom built for them.  I
> had one in the late 60's (and the BC-610-F it went with).  I know what 
> happed to
> the 610 but have no recollection of where the VFO went except that I don't
> think I recovered it after coming home from Vietnam.  In case anyone 
> should ever
> stumble across one, it was from very dim memory maybe 14" wide and sat on 
> top
> of the transmitter, connected to whichever TU was currently in use by a
> double banana plug into the crystal socket.  My -F had an SO-239 installed 
> on the
> rear lip of the top cover.  VFO used miniature tubes and had an internal 
> AC
> supply.  Was band-switching and had a Millen or similar tuning dial. 
> Finished in
> gray or maybe gray hammertone.  That's about all I remember about it, 
> except
> that it had a tendency to chirp.
>
> Robert Downs - Houston
> <http://www.wa5cab.com> (Web Store)
> MVPA 9480
> <wa5cab at cs.com> (Primary email)
> <wa5cab at comcast.net> (Backup email)
>


Hi Clete & Robert,

Thanks for the info on this. Another group member has told me that back in 
the '40s "QST" ran two articles on a choke-coupled buffer amplifier that 
allowed an LM wavemeter or BC-221 to be used as a VFO. I've located my 
copies of the articles (Aug '46 and March '47) and looks like a 
straightforward job, so I will try that route as there seems to be plenty of 
gain in the design and only a tuned output stage. Would be nice to find one 
of those boxes, Robert, but then I've plenty of chirp already, using the 
BC-610 master oscillator in the TU units!

73 to all for '08

Roger/G3VKM



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