a.s.elliott(at)cox.net
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 Posted: Wed Feb 25, 2015 2:10 pm Post subject: antenna switch for handheld |
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It turns out that ICOM produces a convenient little, optionally
panel-mounted device for exactly what you need, under the name Antenna
Switchbox, P/N IC-ANT-SB, which can be had for $64 from Aircraft Spruce
including the BNC-terminate interconnect cable for your handheld.
I made one of these myself maybe 10-12 years ago for an old airplane,
but nowadays would just spend the money! Basically, it is a
soldered-closed brass box with two BNC connectors on the back and a
3.5mm audio plug jack with a NC switch on the front. Lots of variety on
Mouser. (My homemade version used a 1/4" plug.) Closed brass box
protects the signal from interference.
The thing is wired so that input BNC from the panel-mount is connected
to the output BNC to the antenna through the NC switch when the jack is
empty. When you connect the handheld, the plug opens the switch in the
jack and disconnects the panel mount, while connecting the handheld to
the antenna. Pretty idiot proof.
FWIW,
Andy Elliott
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