[time-nuts] US Army Frequency Standard

Don Latham djl at montana.com
Wed Jan 25 01:30:35 EST 2012


Oh Lord, I gotta have one! It's obviously a mil-spec version of:
http://www.youtube.com/watch?v=Z86V_ICUCD4
Don
J. Forster
> 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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-- 
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
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