[time-nuts] US Army Frequency Standard

[John Howell]

It appears to be a "Bradley Lab #6A", Alan Bradley is now part of Rockwell Automation.

John.

O,n 25 Jan 2012, at 05:18, J. Forster wrote:

> 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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> 
> 
> 
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