nuckolls.bob(at)aeroelect
Guest
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 Posted: Fri Sep 16, 2011 10:05 am Post subject: DIY comm antenna . . . OOPS |
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Sent this before I was finished . . . here's the whole
message . . .
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On several occasions I've cited a commonly
marketed insulated feed-thru mounting for CB
antennas as suitable for doing your own
comm antenna. I've seen this part in blister
packs in lots of stores for prices ranging from
8 to 12 dollars.
Here's an offering I just spotted on Ebay
http://tinyurl.com/3bq5uhv
[img]cid:7.1.0.9.0.20110916125619.01dd32f0(at)aeroelectric.com.1[/img]
The price is right.
You can put a UHF connector on your feedline and
it will connect directly to this mounting. Alternatively,
a UHF-M/BNC-F adapter will let you use the more
common BNC-CM connector on your coax.
The other end of the adapter is 3/8-24 thread hole.
Silver solder your stainless antenna whisker into a hole
drilled in a stainless 3/8-24 hex bolt. Bugger
the threads on the bolt pretty good (poor boy's lock
screw). Chisel works good, just leave first three threads
untouched so you can get it to start. Coat the threads with
grease and screw it into the adapter.
The internal tooth lock washer goes inside between the
doubler and the connector. The skin+doubler thickness
should be .09" or better and braced against stringers
and/or bulkheads if possible. Make your antenna 22 inches
long (base to tip of whisker).
Before you mount the antenna in the hole, you need to make
sure the lockwasher doen't migrate and short the antenna
whisker to ground.
[img]cid:7.1.0.9.0.20110916125619.01dd32f0(at)aeroelectric.com.2[/img]
Assemble to this configuration, center the washer up on the
hex and then use spot of super-glue to stick the washer to
the adapter. Not too much. You don't want it to wick under and
run into the theads.
After the glue is set, disassemble and install in the hole.
[img]cid:7.1.0.9.0.20110916125619.01dd32f0(at)aeroelectric.com.3[/img]
Bob . . .
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