[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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