From: N4ZR <n4zr@comcast.net>
To: TowerTalk <TowerTalk@contesting.com>
Subject: [TowerTalk] Rotator loop - another question
<In my old station, someone came up with this idea - instead of an actual
<loop, start with the rotator at mid travel and wrap at least two *loose*
<turns of RG-213 around the mast, then connect to the balun or
<feedpoint.? It worked fine with no problems in 20 years.
<It seems to me that doing it this way provides physical support for the
<loop, which could be beneficial in high winds, but when I was putting up
<my current yagi, people working with me poo-pooed the idea, and so I
<wound up with the conventional loop.? It hasn't failed yet, but...
<So, what's the informed opinion?
<73, Pete N4ZR
## That will work, BUT... the yagi has to be high up the mast..and not 1 inch
above the top bearing.
I have seen it done with big coax, like LMR-1200DB, and also .875 inch
heliax with yagi high up the mast.
In those cases, the loop was aprx 3 feet in diameter.
## another method, with yagi one inch above top bearing... is to tape or ty
rap off the coax out onto the boom,
like 2-3 feet away from the tower...then leave enough of a loop, with rotor
at midpoint, to enable 360-400 deg rotation.
Jim VE7RF
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