nuckolls.bob(at)cox.net
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 Posted: Sat Jan 05, 2008 8:48 am Post subject: Tap into antenna coax? (With Corrected Link) |
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At 08:05 AM 1/4/2008 -0600, you wrote:
This comic-book on crafting a panel
mounted jack to tap into the comm antenna
coax borrowed from this product by
ICOM:
http://www.aeroelectric.com/Pictures/Antenna/ICOM_HH_Adapter_1.jpg
http://www.aeroelectric.com/Pictures/Antenna/ICOM_HH_Adapter_2.jpg
Except that the version I proposed was much
more compact:
http://www.aeroelectric.com/Pictures/Antenna/CommTap-Jack.jpg
However, both designs relied on a miniature, close-
circuit phone jack similar to:
http://www.aeroelectric.com/Pictures/Connectors/Audio/3p5_mm_Jack.jpg
which mates with this plug:
http://www.aeroelectric.com/Pictures/Connectors/Audio/3p5_mm_Phone_Plug.jpg
The quality of the "closed circuit" switch labeled with
the "!" puts the panel mounted comm radio at risk. Switches
of this variety tend to get funky with age. They're "closed"
at any time the hand held radio is not plugged in such
that the comm radio is connected to the antenna. Corrosion
on these open, low pressure contacts can cause poor
connection to the antenna for the panel mounted radio.
Hence, my loss of enthusiasm for this approach to attaching
the hand held radio to ship's comm antenna. Until a better
idea comes along, consider looping some slack in the comm
antenna feedline through the cockpit and breaking it
with an in-line pair of connectors:
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Cable_Female_2.jpg
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Cable_Male.jpg
If you make this joint accessible in the cockpit,
then it's easy to open the connectors and route
the "slack" up to the hand-held's antenna jack.
Consider adding a couple of right-angle adapters
to the end of the antenna coax:
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Rt-Angle_Adapt_1.jpg
These can be used to make a tight u-turn for the
antenna feeder such that it will lay tightly against
the back of the radio. A rubber-band will keep it
snug against the radio. This gets around having
the coax make a wide loop above the radio and makes
it much easier to handle in the cockpit.
Bob . . .
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