[time-nuts] HP 10811 Tuning Diode

[DaveH]

I do not know the circuit in question but could you unsolder the varactor,
solder in a 10pF cap and look at the output?

The frequency would not be stable but if the varactor was the culprit, you
should see less noise.

My 2¢ anyway
DaveH

> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Rick Karlquist
> Sent: Friday, October 19, 2012 11:01
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] HP 10811 Tuning Diode
> 
> I wonder if the glass case got a crack in it or if the kovar seal
> was failing.  Maybe a failed solder joint (which gets fixed when you
> install the new diode). I've never heard of a noisy varactor 
> before either.
> 
> Rick
> 
> 
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