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 <[email protected]> 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 -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
