[time-nuts] HP 8445B

Rick Karlquist richard at karlquist.com
Wed Jan 4 19:51:43 EST 2006

I have several of these, but the electromechanical relay contacts
have become dirty on all of them.  Is anyone familiar with
rejuvenating them?  Especially the idea of running a fairly high
power RF signal through them and hot switching them to burn off
the oxide.

Rick N6RK

Mike Feher wrote:
> These tunable YIG filters are going for practically nothing on ebay. While
> they only go to 18 GHz they make an excellent filter to follow testing of
> an
> LNA after the mixing process, for noise figure measurements, as an
> example.
> After all it is that noise that makes our time and frequency measurements
> questionable. I am surprised that they typically go for around $50 or
> less.
> They are externally tunable with a voltage source that is proportional to
> frequency. I bet a lot of you would be happy to own one. Regards - Mike
> Mike B. Feher, N4FS
> 89 Arnold Blvd.
> Howell, NJ, 07731
> 732-886-5960
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