[time-nuts] Rubidium freq standard - temperature

[Jerry Hancock]

Paul, send whatever you have to clist <mailto:clist at hanler.com> at hanler (without the D) dot com

Also, the caps we replaced were only 4 electrolytics.  3 x 470uf 25v and a 270uf at 16V.  I used a 330uf 25v for the later.

I’ve seen them for like $30 Canadian.  I think they are inexpensive due to the failure of the caps, no rs232,  no docs, etc.  I get great lamp voltage on mine, all over 10V if that says anything.  They seem stable but I don’t have the test setup needed or much to compare them to except my GPSDOs.  I hope to have a Cesium standard by end of year and I am building the TPLL test set.  But it seemed like there was some decent work done on the physics package.  Looks like it was all assembled by hand, then taped-up, sealed twice and clamped.

Thanks.  

Jerry

> On Nov 30, 2017, at 5:24 PM, paul swed <paulswedb at gmail.com> wrote:
> 
> Jerry
> I have some dribs and drabs of details on the units I have. Happy to send
> whatever I have to you directly. Suspect its to large for FEBO. What I can
> tell is they must have been considered quite good and for military use. I
> haven't run mine alot because I was concerned about the temp like you. Nor
> have I really dug in. They just worked from day one.
> Granted maybe better if I look at the caps. The good thing about the unit
> is the connector is clearly labeled with the pin functions. So I was able
> to operate them right out of the hamfest. As I recall these were very very
> inexpensive.
> Regards
> Paul
> WB8TSL
> 
> On Thu, Nov 30, 2017 at 8:04 PM, Jerry Hancock <jerry at hanler.com> wrote:
> 
>> 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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