[time-nuts] Interesting frequency standard project

Brian Lloyd brian at lloyd.com
Fri Jul 4 18:38:58 EDT 2014


On Fri, Jul 4, 2014 at 5:27 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

>
> paulswedb at gmail.com said:
> > The key to these systems is that the transmitters have very good
> references.
> > In the US at least we have no requirement for that level of stability on
> the
> > MW broadcasts. Though evidently some stations are quite good. I think I
> have
> > a list some place have to re-look.
>
> How stable are they?  Could they provide a good regional reference if
> somebody with a good setup would measure several stations and publish the
> results?  How often would you have to measure?
>
> How do you measure the frequency of an AM or FM station?  Wait for silence
> and process it like CW?
>
> Any suggestions for a receiver (or whatever) that would be appropriate for
> that sort of project?  I assume the main requirements are an external freq
> in
> and a serial/USB port to adjust the knobs.
>

You might want to go talk to the FMT guys as they do testing against some
of the MW stations and know which ones have high-accuracy references.

-- 
Brian Lloyd
Lloyd Aviation
706 Flightline Drive
Spring Branch, TX 78070
brian at lloyd.com
+1.916.877.5067



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