goodings(at)yorku.ca
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 Posted: Sun Nov 18, 2007 9:31 am Post subject: Antenna Locations |
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Although ours is a 601HD, I don't think an XL or even a 701 would me much
different. The conventional wisdom is to keep antennae at least 3 feet
apart, more if possible. It makes sense, even if the frequency bands are
different, presumably because harmonics can be a factor. Thus, we put (1)
the GPS antenna on the turtle deck just behind the front lip of the
canopy; (2) the VHS antenna on the top skin behind the canopy where the
two top skins join for doubler reinforcement; (3) the ELT antenna on the
top skin just a bit in front of the fin; and (4) the mode C blade antenna
on the belly just behind the landing gear (no tower has ever reported a
"blind spot" for this location - it occurs on Katanas), accessible from
behind the seats. In this location behind the seats, we have a little
horizontal panel of 0.25" aluminum which bridges forward from the rear
zee; the ELT, transponder and encoding altimeter electronics are mounted
on it, accessible from behind the seats. The ACK ELT can be controlled
from a little switch control (on, reset and LED light) mounted on a
sub-panel. N.B. One thing I would do differently. Mount the VHS antenna
4 or 5 inches further forward using a doubler plate; it his hard to reach
underneath at the back of the baggage shelf on the top skin to connect and
disconnect the BNC cable.
John Goodings, C-FGPJ, CH601HD with R912S, Carp/Ottawa/Toronto.
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