[time-nuts] US Army Frequency Standard

[jmfranke]

If it is the instrument I remember, the tuning fork was used to generate the 
drive for a synchronous motor. The motor drove a disc with hole patterns at 
different radial positions. The frequency control moved a photo cell 
assembly to pick off the different frequencies from the disc.

John  WA4WDL

--------------------------------------------------
From: "John Howell" <j at howell61.f9.co.uk>
Sent: Tuesday, January 24, 2012 5:29 PM
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Subject: Re: [time-nuts] US Army Frequency Standard

> 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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