[time-nuts] R&S XSRM Rubidium

paul swed paulswedb at gmail.com
Mon Jan 24 04:01:36 UTC 2011

Hello to the group.
Well I did bring the RB oven online and indeed the color went from the blue
to the purple/pinkish color when the oven stabilized at 170-177 degress.
Thats what I see it moving around at.
John I agree it doesn't seem to matter what the frequency is. Though my
oscillators is still cranky to start. Really an issue. And the little RB
blob moves around. Interestingly when at temp and purple light I can see at
the center of the ampule window small blobs. Very small. But the area is
actually a bit dimmer because of them.
Looks like I need to hunt down a heat gun now. Have to buy one from some
So this may go silent for a bit till I get one or find out whats up with the
oscillator starting.

On Sat, Jan 22, 2011 at 11:19 PM, John Miles <jmiles at pop.net> wrote:

> >
> > On 01/22/2011 11:31 PM, paul swed wrote:
> > > Well pretty interesting late afternoon.
> > > The oscillator works but C-11 definitely is troubled. Additionally a
> key
> > > element is an effective ground. Bridge the low side of the ampule to a
> > > better ground and the oscillator seems to reliably start.
> > Ignition occurs
> > > when the oscillator is in the 80-85 MC range. It can tune from
> > 65 to 130 MC.
> >
> > Interesting. I tuned for maximum amplitude. Seemed to work well enough.
> I've tried peaking a couple of different LPRO-101s for maximum lamp
> voltage,
> and in both cases I found that while it was possible to achieve more lamp
> voltage, the short-term stability ended up being a bit worse.  I need to do
> some more experiments when I have more time, but my preliminary observation
> is that peaking the trimmer for maximum output is not necessarily the best
> strategy.  Hard to say for sure with n=2, though.
> -- john, KE5FX
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