Today's Message Index:
----------------------
1. 10:44 AM - DIY comm antenna . . . (Robert L. Nuckolls, III)
2. 11:05 AM - DIY comm antenna . . . OOPS (Robert L. Nuckolls, III)
3. 12:17 PM - DIY comm antenna . . . Plan-B (Robert L. Nuckolls, III)
4. 01:01 PM - Re: Something Special For You (Martymason)
5. 07:43 PM - Re: Re: Something Special For You (Robert L. Nuckolls, III)
6. 10:17 PM - Re: Re: Something Special For You (Hadley Heinrichs)
Message 1
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Subject: | DIY comm antenna . . . |
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
Emacs!
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).
Bob . . .
Message 2
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Subject: | DIY comm antenna . . . OOPS |
Sent this before I was finished . . . here's the whole
message . . .
---------------------------------------------------
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
Emacs!
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.
Emacs!
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.
Emacs!
Bob . . .
Message 3
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Subject: | DIY comm antenna . . . Plan-B |
A reader asked if there was enough 'meat' in the connector
base to cut an indexing relief for the lockwasher . . . as
opposed to using glue to fixture the washer. The
answer is 'yes'. See Plan-B version below. Thanks Bill!
---------------------------------------------------
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
Emacs!
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 (total length of base+whisker).
An improved methodology for keeping the lockwasher centered
on the connector is to cut away .015 to .020" of material
off the face of the hex down to a diameter of .500" as shown
here. You can grip the part in a 3-jaw chuck directly onto the
threads. Don't mash 'em and take very light cuts. A couple of
.005" passes produced this end result with no damage to threads.
Emacs!
This modification of the base will keep the lockwasher centered
while you bolt everything up. After all is said and done, here's
what your ready-to-install antenna looks like.
Emacs!
Here's the order of installation on your airplane.
Emacs!
Bob . . .
Message 4
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Subject: | Re: Something Special For You |
Someone must have hacked my address list on the server. My other e-mail addresses
were not affected. This was not my post.
Apologies
Marty
--------
Marty Mason
Europa XS Mono
10%
Norcross, GA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=352483#352483
Message 5
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Subject: | Re: Something Special For You |
At 02:53 PM 9/16/2011, you wrote:
><captainmarty@bellsouth.net>
>
>Someone must have hacked my address list on the server.
Figured as much. No problem.
Bob . . .
Message 6
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Subject: | Re: Something Special For You |
YOUR LINK COMPLETELY,-MELTED DOWN MY MACHINE!!! - 29 HOURS OF WORK WITH
NO RESOLUTION.............((((=0A=0A=0A=0A>_______________________________
_=0A>From: Martymason <captainmarty@bellsouth.net>=0A>To: aeroelectric-list
@matronics.com=0A>Sent: Friday, September 16, 2011 2:53 PM=0A>Subject: Aero
Electric-List: Re: Something Special For You=0A>=0A>--> AeroElectric-List m
essage posted by: "Martymason" <captainmarty@bellsouth.net>=0A>=0A>Someone
must have hacked my address list on the server. My other e-mail addresses w
ere not affected. This was not my post.=0A>Apologies=0A>Marty=0A>=0A>------
--=0A>Marty Mason=0A>Europa XS Mono=0A>10%=0A>Norcross, GA=0A>=0A>=0A>=0A>
=0A>Read this topic online here:=0A>=0A>http://forums.matronics.com/viewtop
======================0A>=0A>=0A>
=0A>=0A>=0A>
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