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I've got a Lancair 320, and it seems likely that the original comm
antenna buried in the vertical stab is beyond usable (either poorly
installed originally, or poor ground plane - but in any event no way to
dig it out and fix it).
There is an old Loran antenna in the tail (no longer used) which is
virtually identical in dimensions to a Comant
CI 122 bent whip. It doesn't currently have a ground plane, but I
could stick one in there.
I have also heard of some kind of flexible antenna that gets glued to
the insides of the tailcone.
Questions:
- What antenna works best (given that it is too late to embed in the
vertical stab)?
- What size ground plane do I use?
- Do I ground the ground plane and, if so, where?
- Do I allow the antenna wire shield ground to electrically connect to
the ground plane, or should they be insulated? (I can imagine grounding
the ground plane to the battery in back, having it contact the antenna
shield which grounds to the bus in front, and having that situation
cause a loop which might have adverse consequences)
- How critical is it to use the newest kind of coax? The old coax is
embedded down the side of the plane away from all signal wires, and if
I replaced it I'd have to run the new one up the center with a lot of
other wires...
Thanks all!
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