[time-nuts] US Army Frequency Standard

John Howell j at howell61.f9.co.uk
Tue Jan 24 17:29:26 EST 2012


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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