Doug Kealey wrote:
>> We want to further reduce reflections in the chambers at 1.575 GHz for
some
sensitive GPS receiver testing.  [We put panels of ferrite cones on the <<

Why not use frequency selective sheet absorber? I know it's made for radar,
and you may be able to get a custom build for the GPS bands.  

Plessey used to make this, but I can't help with other names,
unfortunately. 

There've been a number of papers on frequency selective surfaces in recent
years, and it may be you can get an updated absorber design that is
transparent to other bands, and just hang it on the existing cones.

Cortland
KA5S

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