Date: Tue, 5 Jul 2016 19:58:56 -0400
From: "James Wolf" <jbwolf@comcast.net>
To: <towertalk@contesting.com>
Subject: [TowerTalk] Cable routing
Message-ID: <002201d1d719$31246cc0$936d4640$@comcast.net>
Content-Type: text/plain; charset="us-ascii"
I'm looking for suggestions on coax routing.
I've got the Tennadyne log antenna almost ready to go up. I have 12 turns
of coax at the feed point for a choke and the coax connects at the end of
the boom which means that the coax feedline needs to follow the bottom
square tubing which is 1/2 of the boom and is connected to one side of the
coax. In my case I elected to connect the bottom 1/2 of the boom to the
shield.
I'm concerned about attaching the coax to the bottom 1/2 of the boom. I
picked up some black UV protected cable ties and plan to put tape around
them to help keep the sun damage down.
I have experience with VHF/UHF yagi's where I've taped the coax to the boom
to get it back to the mast and over the decades, the best tape has
deteriorated and the cable is now dangling beneath the boom.
I don't want that to happen to the Tennadyne. I've thought about the metal
ties that are used on commercial towers, but since the boom is "hot" I'm not
sure that is a good idea.
Since the two halves of the boom are close together, maybe 3/8" between the
two square booms, it is difficult to get the tape wrapped around it more
than about one turn before you have to cut it and start another piece on top
of it.
Any suggestions on how to secure the feedline to the boom on this antenna?
Jim – KR9U
## W8JI has a tech note on feeding the Tennadyne LPDA yagis. They have
hot booms,
and you cant just tape the coax to the boom. It requires a CMC where the coax
leaves the
hot boom, right at the mast.
http://www.w8ji.com/baluns_on_log_perodic_antennas.htm
Jim VE7RF
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