[Johnson] Ranger 1 Question/Problem

[Glen Zook]

If that is the power resistor in the VFO compartment
there was a discussion on a couple of reflectors about
this.  It seems that removing it from the VFO
compartment actually causes more drift when outside of
the compartment than within the compartment.

The temperature compensation for the Johnson VFOs was
done with this resistor inside the VFO compartment and
removing it actually upsets the compensation resulting
in more drift.

Several amateurs did frequency stability tests with
the resistor both inside and outside of the
compartment.  Every one of the results were the same: 
Considerably more drift when on the outside.  The
comparisons were made from a cold start through
several hours of operation.  It was surmised that
Johnson put the resistor inside the compartment to
temperature stabilize the VFO sooner and for long-term
stability.

Glen, K9STH


--- Jerry K <w5kp at direcway.com> wrote:

First question everybody will ask: Has the
anti-Chernobyl mod (18K R3 relocation/replacement)
been done?
> If not, this is not good.

Glen, K9STH

Web sites

http://home.comcast.net/~k9sth
http://home.comcast.net/~zcomco


		
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