Topband: Submerging variable caps in oil as substituteforvacuumvariables

[Charlie Cunningham]

Great information, Rick!  (Of course we still don't know about dissipation
and heating at high power - unlike the situation in the 4815A. Of course
guys running power could employ  a thermal probe initially to investigate
the heating.)

Good info!

73,
Charlie, K4OTV

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Richard
Karlquist
Sent: Sunday, February 02, 2014 3:31 PM
To: topband at contesting.com
Subject: Re: Topband: Submerging variable caps in oil as
substituteforvacuumvariables

On 2014-02-02 05:58, Hardy Landskov wrote:
> FYI All,
> The HP4815A Vector Impedance Meter submersed the main tuning capacitor

> I need to open mine up and replace one of the capacitors because the
> oscillator will not start on the higher frequency ranges. I am gun shy
> at this point until I know exactly what I am dealing with.
> 73 Hardy N7RT

The guy who knows everything about the 4815A is ex-HP'er
George Sandford who is still in business supporting these
classic instruments.  If anyone would know about the
oil, it would be him.  He probably has some NOS oil on hand.

See:

www.hp4815a.com

Rick N6RK

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