[time-nuts] Digital Clock kit - no Integrated circuits!

[jmfranke]

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" <djl at montana.com>
Sent: Saturday, January 09, 2010 7:29 PM
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
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
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>
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