[amsat-bb] metal or non metal cross booms
gopalmadhavan at vsnl.com
Sat Apr 5 17:50:56 PST 2008
I have experimented with both non-metallic and metallic cross booms after
reading numerous articles on the subject some years ago. With CP antennae
mounted in X configuration there seems to be hardly any difference in
performance. I speak of experiments done when AO-40 was active.
I now use a metallic boom as it gives very good rigidity to mount two CP
antennae, a small dish for 2.4 GHz, preamps etc. Here in India I do not have
the option to order a good section of fibre glass cross boom any way, and so
had made do with PVC tube wrapped in fibre glass, but it eventually sagged
and I had to periodically rotate it 180 degrees to keep it somewhat level.
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