[Collins] VFO Schematics

Tue, 7 Oct 2003 15:42:17 -0400

This material appeared in July/August, 2003  issue of the Collins Journal

David, W3ST
Publisher of the Collins Journal (see the website to subscribe)
www.collinsra.com

From: "Vernon Van Zandt" <[email protected]>
To: "R.J. Mattson" <[email protected]>
Cc: "collins" <[email protected]>; "collins2" <[email protected]>
Sent: Monday, February 03, 2003 10:00 PM
Subject: Re: [Collins] VFO Schematics

> Hi Bob,
>
> Thanks for the return...
>
> This agrees with the little bit of info that I found in the Collins list
> archives.  The addition of a 6AK6 as an untuned class A buffer amp (I'm
> repeating what was written by others...) to boost the output of the PTO
> (1.6 to 2.0 Mhz) so that it can drive a transmitter oscillator... The
> info I have suggests that the output can be fed directly to the
> transmitter xtal socket.  This configuration was said to have appeared
> in a 1949 Collins sales brochure showing a 70E-8A PTO, etc... I'm hoping
> someone will have one laying about in their collection that also won't
> mind sharing a digitized copy, since others have also expressed interest
> in this mod...
>
> TNX es 73's
> -Vern N7GTB
> On Sun, 2003-02-02 at 20:53, R.J. Mattson wrote:
> > Hi Vern,
> > I believe the 70E-8A PTO in the 310C has a 160m output.
> > It is doubled in the 6AG7 (V101) tuned buffer.
> > 73 Bob Mattson...W2AMI
> > http://www.qrz.com/callsign/w2ami
> >
> > ----- Original Message ----- 
> > From: "Vernon Van Zandt" <[email protected]>
> > To: "collins" <[email protected]>; "collins2"
<[email protected]>
> > Sent: Sunday, February 02, 2003 12:42 AM
> > Subject: [Collins] VFO Schematics
> >
> >
> > Greetings.
> >
> > Anyone here happen to have the schematics for a Collins 310C
> > VFO/exciter, and wouldn't mind sharing them?
> >
> > Also, sometime ago there was a question posted regarding a mod that
> > allows the VFO to be used for 160 meter operation.  Something along the
> > lines of adding a buffer amp circuit...?  Can anyone can shed some light
> > on this, or even details (schematic maybe?) on how it is connected,
> > etc..?
> >
> > (Sorry about the cross-post, but my question would be verbatim on both
> > anyway...)
> >
> > Many thanks,
> > N7GTB
> > Vern
> >
> >
> >
> > Sponsored by the Collins Radio Association
> > http://www.collinsra.com
> >
>
>
> Sponsored by the Collins Radio Association
> http://www.collinsra.com