[time-nuts] Rubidium as radio reference

Joseph Gray jgray at zianet.com
Sun Nov 4 12:37:59 EST 2012


John,

The radio is on 2M.

Joe Gray
W5JG


On Sun, Nov 4, 2012 at 5:23 AM, John Ackermann N8UR <jra at febo.com> wrote:

> Joe, the question is whether the DDS spurs and noise on the FE-5680A are
> strong enough to interfere with your measurements.  I suspect that in the
> HF/VHF range, you'd probably be OK, at UHF maybe dicey, at microwave
> probably not good (assuming you're multiplying the Rb up).
>
> I have phase noise measurements of the "narrow DDS" version of the
> FE-5680A along with some other low-cost Rbs at
> http://febo.com/pages/oscillators/rubes/
>
> 73,
> John
>
> 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>
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