[time-nuts] Rubidium freq standard - temperature

paul swed paulswedb at gmail.com
Thu Nov 30 20:47:40 EST 2017


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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> >>>>
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