[time-nuts] Interesting frequency standard project
max at maxsmusicplace.com
Fri Jul 4 23:45:22 EDT 2014
The best way to measure the frequency of an AM station is to first pass it
through a Crystal filter to strip off the modulation sidebands. After that
limiting is usually not necessary. You can do that in either TRF mode, or
in the IF of a superhet with a synthesized local oscillator.
Max. K 4 O DS.
Email: max at maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
Vacuum tube site: http://www.funwithtubes.net
Music site: http://www.maxsmusicplace.com
To subscribe to the fun with transistors group send an email to.
funwithtransistors-subscribe at yahoogroups.com
To subscribe to the fun with tubes group send an email to,
funwithtubes-subscribe at yahoogroups.com
To subscribe to the fun with wood group send a blank email to
funwithwood-subscribe at yahoogroups.com
----- Original Message -----
From: "Alexander Pummer" <alexpcs at ieee.org>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Friday, July 04, 2014 5:59 PM
Subject: Re: [time-nuts] Interesting frequency standard project
> for an AM station is strait forward at first use a narrow filter to make
> sure that you have just one station and feed the filter out put into a
> limiter the output of the limiter will be the carrier.
> KJ6UHN Alex
> On 7/4/2014 3:27 PM, Hal Murray wrote:
>> paulswedb at gmail.com said:
>>> The key to these systems is that the transmitters have very good
>>> In the US at least we have no requirement for that level of stability on
>>> MW broadcasts. Though evidently some stations are quite good. I think I
>>> 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
>> and process it like CW?
>> Any suggestions for a receiver (or whatever) that would be appropriate
>> that sort of project? I assume the main requirements are an external
>> freq in
>> and a serial/USB port to adjust the knobs.
>> Ages ago, I remember seeing a small booklet (20 pages?) from NBS
>> their setup with HP that was using NBC's atomic clock for time
>> HP's part was to run the west coast calibration to get the delay over
>> lines from the east coast to the west coast. Has anybody seen a copy of
>> booklet online?
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> and follow the instructions there.
More information about the time-nuts