I would question the ability to change it. Not familiar with the radio, but fcontrol feeds back to the 12.8Mhz oscillator by a varicap. If its part of the pll of the radio then no. If its a RIT control then as mentioned yes. The RIT will no longer work.
Regards Paul WB8TSL On Sun, Nov 4, 2012 at 7:26 AM, Bob Camp <li...@rtty.us> wrote: > Hi > > Simple - feed it in at the high side of the crystal. > > Still easy - pop out the crystal and feed it in there. > > More complex - re-wire the base of Q101 so it's detached from all the caps > and crystals. It's now a comm emitter buffer. AC couple the signal in there. > > Of course you still have the problem that the output of the FE is *very* > messy at RF. > > Bob > > > On Oct 30, 2012, at 8:28 PM, Joseph Gray <jg...@zianet.com> wrote: > > > I know that some here are Amateurs and have used external sources to > > provide a more accurate reference for a receiver. So, I have a noob > > question or two. > > > > Is the programmable FE-5680A suitable to replace the 12.8 MHz > > reference in a Midland XTR? If so, where do I feed the rubidium into > > the circuit (see attached screen clip)? X101 is the 12.8 MHz crystal > > and R107 is used for temperature compensation. > > > > What I have in mind is to use the XTR radio for measuring off-the-air > > carrier frequency error. It's just part of a project that I've been > > thinking of doing. Things are still in the planning and experimenting > > stage. > > > > Joe Gray > > W5JG > > <ScreenClip.png>_______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.