[time-nuts] US Army Frequency Standard

J. Forster jfor at quikus.com
Wed Jan 25 00:18:27 EST 2012


Self generating, therefore selenium (or possibly silicon). There is no
bias so it's not a photoconductor. I'm sure it's called out in the -24P
manual.

-John

===============

> Thank you everyone for your comments, and if I've got it right Brooke, if
> you paste this into your browser:
>
> http://www.flickr.com//photos/75ohm/sets/72157629019710615/show/
>
> you should get a quick tour and a movie!
>
> This is indeed a tuning fork driving a synchronous motor that has a
> perforated disc on its shaft. The whole unit operates as it should and the
> quality of manufacture is superb, so I'm reluctant to pull it apart  but I
> am curious as to the type of photocell it uses. It seems very small and
> the dates on many of the components suggest manufacture in the mid to late
> 1950s so what was around to do the job at that time? There is no cathode
> bias on the "voltage amplifier" that it feeds which suggests it s
> Photovoltaic rather than Photoconductive.
>
> Thanks again for your replies,
>
> John H.
>
>
> On 24 Jan 2012, at 22:34, Brooke Clarke wrote:
>
>> Hi John:
>>
>> Is there a photo of the freq std on line?
>>
>> Have Fun,
>>
>> Brooke Clarke
>> http://www.PRC68.com
>> http://www.end2partygovernment.com/Brooke4Congress.html
>>
>>
>> John Howell wrote:
>>> Thanks Bob,
>>>
>>> If it helps the switched frequencies are: 0, 10, 20, 40, 60, 80, 100,
>>> 120, 140, 160, 180, 190Hz.
>>>
>>> John.
>>>
>>> On 24 Jan 2012, at 22:09, Bob Camp wrote:
>>>
>>>> Hi
>>>>
>>>> Sounds about right for calibrating / verifying vibrating reed
>>>> frequency
>>>> readouts.
>>>>
>>>> Bob
>>>>
>>>> -----Original Message-----
>>>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
>>>> On
>>>> Behalf Of John Howell
>>>> Sent: Tuesday, January 24, 2012 5:00 PM
>>>> To: Discussion of precise time and frequency measurement
>>>> Subject: [time-nuts] US Army Frequency Standard
>>>>
>>>> Hi All,
>>>>
>>>> I recently obtained a curious Low Frequency Standard dating from the
>>>> late
>>>> 1950s. Its output can be switched to a number of frequencies from 10
>>>> to
>>>> 190Hz, derived from a tuning fork. It is marked "Signal Corps" and "US
>>>> Army"
>>>> with a type number TS-65D/FMQ-1.
>>>>
>>>>
>>>> Does anyone have any information about this unit, in particular what
>>>> it was
>>>> used for and why the strange negative going pulse output and specific
>>>> frequencies.
>>>>
>>>> Thanks in advance,
>>>> John H.
>>>>
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