[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

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