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  #1  
Old February 1st 04, 12:56 AM
Rob Cherney
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On Sun, 01 Feb 2004 00:39:58 GMT, Ron Wanttaja
wrote:

In other words, when I reach back and grab the end, I'm going to want to
instantly know it's the transponder cable without being able to read the
label. Any suggestions?


How about putting a plastic cable tie on the coaxial cable just behind
the connector? In fact, you could put two cable ties on the NAV
antenna connector so you could discern the difference between it and
the COM connector.

Rob-
------------------------------------------------------------------
Robert Cherney e-mail: rcherney(at)comcast(dot)net
  #2  
Old February 1st 04, 01:19 AM
Orval Fairbairn
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In article ,
Rob Cherney wrote:

On Sun, 01 Feb 2004 00:39:58 GMT, Ron Wanttaja
wrote:

In other words, when I reach back and grab the end, I'm going to want to
instantly know it's the transponder cable without being able to read the
label. Any suggestions?


How about putting a plastic cable tie on the coaxial cable just behind
the connector? In fact, you could put two cable ties on the NAV
antenna connector so you could discern the difference between it and
the COM connector.

Rob-
------------------------------------------------------------------
Robert Cherney e-mail: rcherney(at)comcast(dot)net


You could also file a flat area on the TXP cable.

BTW, it DOES make a difference if you hook up the comm antenna to the
nav and vise-versa. One is horizontilly polarized while the other is
vertically polarized. Both receiver sensitivity and xmit capability cna
be severely compromised.
  #3  
Old February 1st 04, 07:58 AM
Ron Wanttaja
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On Sun, 01 Feb 2004 01:19:22 GMT, Orval Fairbairn
wrote:

BTW, it DOES make a difference if you hook up the comm antenna to the
nav and vise-versa. One is horizontilly polarized while the other is
vertically polarized. Both receiver sensitivity and xmit capability cna
be severely compromised.


Yes, but: The Narco "Comm" antenna is the transmitter, and the "Nav"
antenna provides the signal for the receivers for BOTH the Nav and the Comm
channels. The Comm receiver is *supposed* to use horizontally-polarized
antenna. I know, it ain't right optimum. But that's the way Narco wants
it.

The original two antennas in the airplanes were coax dipoles with baluns.
Both horizontally oriented, both located UNDER the aluminum-covered
turtledeck. They were truly duplicates. And they worked quite well, for
almost 20 years.

One crapped out a few years back, and that's when I built the surface-mount
antenna described in my "Antenna Madness" posting about three years ago.

So I've got one horizontal, and one vertical. I try to hook the old dipole
(the horizontal one) to the receiver and the new vertical one to the
transmitter. I actually run the coaxes in two pieces, with the connector
right by the seat, so I can switch antennas easily if I detect a problem.
This is handy for troubleshooting...a couple of times, I've noticed that I
wasn't receiving signals very strong, or folks complained that they
couldn't hear me very well. I've been able to quickly swap antennas and
compare.

Ron Wanttaja
 




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