[time-nuts] Rubidium as radio reference

[paul swed]

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 <lists at 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 <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
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