[time-nuts] Efratom M3100

EWKehren at aol.com EWKehren at aol.com
Sun Apr 1 20:44:20 UTC 2012


Thanks Mike
 
 
In a message dated 4/1/2012 4:33:51 P.M. Eastern Daylight Time,  
mblazer at satx.rr.com writes:

The  JM38510/11201BCA crosses to a LM139 which is the Mil-Spec version of 
the  LM339.

Mike



On 4/1/2012 2:39 PM, EWKehren at aol.com  wrote:
> 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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