[time-nuts] Mystery hp Ovens For Sale

Charles Steinmetz csteinmetz at yandex.com
Sun Jun 5 09:05:25 EDT 2016

Bob wrote:

> The R390 ran at 200 KHz and divided by two, but that’s an oddball. After
> the fact they figured out that the approach really did not improve things.

Actually, it was the later R390A that used a 200kHz crystal and divided 
by two.  The original (earlier) R390 used a 1MHz crystal and divided by 
10.  In both cases, the "division" was accomplished by injection locking 
an astable multivibrator running with a natural period of ~100kHz.

Best regards,


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