Mailing List lml@lancaironline.net Message #4221
From: Brent Regan <brent@regandesigns.com>
Subject: Com Radio Antenna Diplexer
Date: Mon, 27 Dec 1999 12:23:20 -0800
To: Lancair List <lancair.list@olsusa.com>
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I had a COM radio splitter BUT the performance was so-so. Before I fitted a
second antenna (on the belly) it was not uncommon to fly off the squawk (out
of range) of one controller before receiving my hand-off. I would have to
pull the squawk knob and listen, what a pain. Even though my plane is well
wired and shielded, pressing the PTT with altitude hold on caused the nose
to drop. After I added the belly antenna, everything got better.

Remember that a splitter "splits" the signal so you only get half the signal
strength to each radio. This reduces the range by about 30%. This is fine if
you fly where there are lots of VORs or use them mostly for
localizer/glideslope and use GPS for NAV.

I would not recommend using a splitter/switch on the COM as sometimes you
need all the range you can get.

Brent

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