Russ wrote:

It's probably "dry" N2. It is used to prevent water absorbtion and O2
absorbtion of the RF. It can also be used to detect leaks and to keep
out atmospheric water.

Russ

Exactly! Very common in some of our shipboard antenna tuning units as
well -- at least back in the 70's.
Irv VE6BP

--
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Diagnosed Type II Diabetes March 5 2001
Beating it with diet and exercise!
297/215/210 (to be revised lower)
58"/43"(!)/44" (already lower too!)
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Irv Finkleman,
Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP
Calgary, Alberta, Canada