[time-nuts] Maser manual (2)

[paul swed]

If the thing has a variable cap to tune the osc. My bet is thats the devil.
In cheapy telco RBs they have given me lots of trouble.

On Wed, Sep 1, 2010 at 11:40 PM, John Miles <jmiles at pop.net> wrote:

> Good point -- I should swap out the feedthrough as well.  There is only one
> in this case, for the power lead-in, but if it is growing internal whiskers
> or otherwise failing I could see it causing this symptom...
>
> -- john, KE5FX
>
> > -----Original Message-----
> > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
> > Behalf Of Kit Scally
> > Sent: Wednesday, September 01, 2010 8:34 PM
> > To: time-nuts at febo.com
> > Subject: [time-nuts] Maser manual (2)
> >
> >
> > John,
> >
> > I'd put money on one of the feedthrough caps (easily damaged upon
> > installation) in the Maser for such small jumps.
> > >From memory, the 5065A uses SM components, but these could be guilty.
> >
> > I've learned many abstract things I'd never otherwise come across
> > in this thread on home-built masers.  I for one would like to see
> > more mileage on this topic although I'm not sure there's $25k in
> > my "Xmas box" for the necessary parts to build one !
> >
> > Kit
> > VK2LL
> >
> > >>>snip
> > The 5065A is showing occasional phase jumps on the order of 10-100 ps
> that
> > coincide with small spikes in the current drawn by the lamp
> > exciter, and I'm
> > leaning towards blaming the silver-mica B-E feedback capacitor.  (It even
> > has the same designation in both instruments' service manuals, C2.)
> > Tom: this is why your BVA was appearing to jump when I measured it. :-P
> >
> > -- john, KE5FX
> > >>>snip
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