[amsat-bb] Clearance for Arrow II antenna when mounted?
rmann at latencyzero.com
Sat Dec 15 12:08:16 PST 2007
Hi. I have an Arrow II Yagi crossed 7x7 (440 MHz) and dual-band 3x7
(144 MHz & 440 MHz). The manufacturer rates them at 10 W max while
hand-held, but if I mount them, they're rated at 150 W max? I have an
IC-910H, max 100W on 144 MHz and 75W on 440 MHz.
There are two scenarios:
1) On a tripod that someone will stand next to, and manually orient.
2) On a tracking telescope mount I have. My other concern here is that
EMI will interfere with the telescope's on-board computer.
In each case, how far should I keep away from the antenna? Sadly, they
don't publish radiation patterns. If it's manually oriented, I suppose
I can have a friend run out to it when not transmitting, re-point the
beam a bit, then run away before I transmit.
More information about the AMSAT-BB