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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 |
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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. |
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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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