[TowerTalk] Cable routing

[Kimberly Elmore]

I got tired of replacing deteriorating black tape and I could never get ty-wraps to last long enough. So, I used SS worm-type hose clamps. I was very careful to make them only a *little bit* snug, lest I crush the cabling. I figure these will last longer than the cable. I did on the mast and the antenna booms and have never looked back. I have CMCs on each antenna, but need to add them to the cable end that enters the shack. The only square material to which I needed to secure cables was rather small and only a short run. I used only enough pressure on the clamp to make the cable snug, *not* tight. 
Kim N5OP

      From: Jim Thomson <jim.thom at telus.net>
 To: towertalk at contesting.com 
 Sent: Wednesday, July 6, 2016 9:42 AM
 Subject: [TowerTalk] Cable routing
   
Date: Tue, 5 Jul 2016 19:58:56 -0400
From: "James Wolf" <jbwolf at comcast.net>
To: <towertalk at 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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