[time-nuts] Rubidium freq standard - temperature

[paul swed]

With some humor as I looked inside my egg I had replaced the caps also. So
it is a common failure.
Also note the chip is not a micro but an array or at least a state machine.
Regards
Paul
WB8TSL

On Thu, Nov 30, 2017 at 8:47 PM, paul swed <paulswedb at gmail.com> wrote:

> Will forward tomorrow. Yes I recall my lamp voltage is also very good.
>
> On Thu, Nov 30, 2017 at 8:41 PM, Jerry Hancock <jerry at hanler.com> wrote:
>
>> 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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