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Technical question about RF absorbtion

Hi All,

Imagine you have a satellite under test in a very small thermovac chamber
with a 70cms 1/4 wave whip sticking out of one end of the spacecraft.

The tip of the antenna is probably only a few inches from the wall of the
chamber but you want to test the transmitter to characterise thermal
properties etc etc.

You do not want to substitute a dummy load for the antenna cos it will cause
other problems.

What could you "wrap" the antenna with that would absorb most of the RF or
at least not present a terrible SWR and would not upset the owner of the
chamber due to excessive outgassing?

Any valid suggestions will be much appreciated and if used will attract a
prize from a certain satellite team!

many thanks


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