Actually, the phonic wheel motor working at 1 kHz was used in the first ever
crystal controlled clock made by W. A. Marrison of the Bell Telephone
Laboratories in 1930. I too have a couple of the General Radio
synchronometers, which I am restoring.
John WA4WDL
--------------------------------------------------
From: "Don Latham" <[email protected]>
Sent: Saturday, January 09, 2010 7:29 PM
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits!
Hp kinda stole the idea from the old General Radio syncro clock (I have
two of these). In the longago time, we had a homemade version that
generated 1 sec ticks to drive clocks in our research tower lab at New
Mexico Tech. It ran for a number of years.
Don Latham
Chuck Harris
Sing is an understatement!
The motor is essentially a stepper motor that is being run with
a 2 phase excitation. It is driven with 1000Hz, and whines pretty
good... Fortunately it is in a thick aluminum case that is both air
and water tight.
It is considerably quieter if you make sure the ball bearings
are in good shape.
-Chuck Harris
J. Forster wrote:
HP made one with a sync motor running a Veeder Root counter. Something
like a 115A. Runs off 100 KHz from their crystal oscillator. Neat unit.
It does "sing" a bit.
-John
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--
Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com
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