[time-nuts] Rubidium as radio reference

[Bob Camp]

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 <jgray at 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 at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.