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...@howell61.f9.co.uk>
Sent: Tuesday, January 24, 2012 5:29 PM
To: "Discussion of precise time and frequency measurement"
<time-nuts@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-boun...@febo.com [mailto:time-nuts-boun...@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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