[time-nuts] Rubidium freq standard - temperature

[Jerry Hancock]

Paul, The units Gilbert gave me were TS-RFS.  They are fairly large.  The physics end is about 5”x2”x2" and overall length about 9”.  They lock pretty quickly now that I’ve replace the caps.  They can drive 50ohms pretty hard, outputting a square wave.  I’m thinking of bolting on some fins to the physics end. Just two points: 1) it would be nice to dial them in closer; and 2) I wish I had equipment to test them more accurately.  I’m working on building one of the Tight PLL test sets to solve #2.  Gilbert suggested we look to see if we could tap into the field current somehow to set the frequency more accurately.


> On Nov 30, 2017, at 3:44 PM, paul swed <paulswedb at gmail.com> wrote:
> 
> Jerry
> You have some EG&G RBs. Thats great news. Now I am not alone. I have 2 also
> that work. I have found little details on them.
> That said I believe they are intended to be mounted on a heat sink. One end
> surely looks like that whats would be done.
> I believe mine are LCR-10-T. Might have to double check that.
> Regards
> Paul
> WB8TSL
> 
> On Thu, Nov 30, 2017 at 6:22 PM, Jerry Hancock <jerry at hanler.com> wrote:
> 
>> I was able to get all 5 of these EG&G Rubidium Frequency Standards running
>> by replacing the caps as another member found.  They have a large heatsink
>> on them, no fins, and are running at 43C.  Is that too hot?  Should I bolt
>> them down to a larger heatsink?  They consume a little over 9w after they
>> lock, about double that while warming up.
>> 
>> The only other issue I see is that the 8bit frequency setting doesn’t
>> allow me to set the frequency closer than 5E-11.  I don’t know if this is
>> good for these units and RFS in general or not.
>> 
>> Thanks.
>> 
>> Jerry
>> 
>> [/begin buttkissing]
>> 
>> PS:  I have learned quite a bit from this group in the past couple of
>> months.  John Miles, Gilbert, Mark Sims, Bob, etc, etc have been a lot of
>> help and have added a lot of enjoyment to my hobby.
>> 
>> [/end buttkissing]
>> 
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