Efratom M3100
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.
Thanks Bert Kehren
Strange indeed Bert I put the whole number into google and had 5 hits. The
first number is actually JM then the number but its a quad voltage
comparator according to the data archive. pdf is available and looks like
numbers of manufacturers made it. PMI TI Nat nalog dev. They are still
available also.
Regards
Paul.
On Sun, Apr 1, 2012 at 1:50 PM, EWKehren@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.
Thanks Bert Kehren
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On 04/01/2012 07:50 PM, EWKehren@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