[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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