[time-nuts] Efratom M3100
EWKehren at aol.com
EWKehren at aol.com
Mon Apr 2 00:33:31 UTC 2012
Magnus
I am systematically checking every thing. Power is every where, get a very
strong 60 MHz with the 5.3125 clearly visible on the spectrum analyzer also
counted both with a counter, checked the 85 Hz modulation on the tuning
diode, is a small signal but the same on my working M 100. Some is off the M
100 some off the FRS. Working on the Servo assembly. Because of dense
packaging it is very difficult to find the output signal, but I am now sitting
down with the ohm meter and retracing all the interconnects on the servo
board. It is multi layer. Once I have the 85/170 pass I will inject a variable
frequency, maybe 85 Hz is wrong.
I will keep you posted. The biggest problem is the packing density, very
hard to get to the pins of the IC's.
Bert
In a message dated 4/1/2012 6:56:55 P.M. Eastern Daylight Time,
magnus at rubidium.dyndns.org writes:
Bert,
On 04/01/2012 07:50 PM, EWKehren at aol.com wrote:
> In the past I have asked if some one has any info of the Efratom M3100. I
> have carefully dissected the unit and checked functionality. It sweeps
but
> does not lock. Lamp signal is strong 60 MHz and 5.xx all work properly
and
> can be seen on a spectrum analyzer The problem is in the loop and there
is
> not enough signal into the phase detector. Trying to follow the
detector
> output is challenging because lack of information and packaging density.
> Typical loop frequency in a M100 is 127/254 in this case I see 85/160.
I would
> expect in a military application they would go up not down for vibration
> purposes. Tracing the circuits is also made more difficult because of
the use
> of mil parts and mil nomenclature. I have most cross correlated and I am
> down to one PMI part 38510/11201BCA. Does any one have any info, such a
> nice unit, would like to make it work.
OK, does all the parts have operational power?
Does the modulation work?
Maybe it needs phase-trimming for best detection gain?
Can you hook up a scope so you have modulation sweep on X and detector
response at Y?
You should be able to probe around. I had some part success with a
similar rubidium, until I had reversed it to such a degree that I knew
that it was a power-supply in the thick-film module that had failed.
Cheers,
Magnus
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