[time-nuts] Efratom M3100
EWKehren at aol.com
EWKehren at aol.com
Tue Apr 3 14:58:15 UTC 2012
Ed
Thank you for your interest. I have checked many of the circuits which is
made easy in some cases because it is a duplication of the M100 in some
areas and the FRS in others. I have both for comparison. Do to the very high
densely packaging is it not easy to probe since some of the signals are not
accessible.
It comes down to the loop from the Varicap modulation diode which only
shows a very small signal but that is what I also see on the M100, the SRD, the
photo cell and the AC amplifiers. There is only a very small very noisy
signal at the input of the phase detector, the M 100 shows a very clean 5
volt signal. Will next open the loop and feed exactly 10 MHz in to the loop.
Bert Kehren
In a message dated 4/3/2012 1:08:14 A.M. Eastern Daylight Time,
eb at telight.com writes:
I have some SPTB-100 units, which are similar to M100 units, which
may be similar to yours. A few years ago, one failed to lock,
regardless of adjustment, and I found that one of the integrator
capacitors in the OCXO control loop was very leaky. I don't recall
which one, and couldn't even identify it because I had no exact
schematic, but I was surprised because it was a plastic or
small-valued ceramic unit (and not within the high temperature
environment of the oven), which in my experience were usually quite
reliable.
Ed
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