[time-nuts] Efratom M3100

EWKehren at aol.com EWKehren at aol.com
Sun Apr 1 19:39:27 UTC 2012


Paul thank you.
 I tried google and only got links to advertise other parts. Makes  sense, 
unit has a summary bit output, probably checks 4 levels and gives a lock  
output. Different from M100 and other Efratom products. Still hunting for the 
85  Hz, 127 Hz on the M100 is 5V pp into the phase detector. can not rule 
out the  actual cell, maybe the step recovery diode. Will try every thing else 
before I  go there.
Bert.
 
 
In a message dated 4/1/2012 3:14:55 P.M. Eastern Daylight Time,  
paulswedb at gmail.com writes:

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 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.
> Thanks    Bert Kehren
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