The GR system did the same thing. There's wasn't sound proofed and really
made a whine. I had a NASA surplus one running in my office for about a
week when someone in the department needed a stable 1ms time reference. It
didn't take me long to build one with 7490s.
Regards.
Max. K 4 O D S.
Email: [email protected]
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----- Original Message -----
From: "Chuck Harris" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Saturday, January 09, 2010 5:09 PM
Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits!
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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