[TowerTalk] Stepper Antennas and Shunt Feed Towers

[john at kk9a.com]

I had a 160' tower with 5 TIC rings.  For 160m I used a 1/4 wl wire vertical 
hung from one of the guy wires.  It worked well and I avoided any RF 
problems to the rotators which can occur with shunt feeding.

John KK9A



To: TowerTalkSubject:
Re: [TowerTalk] Stepper Antennas and Shunt Feed Towers
From: "Dick Green WC1M"
Date: Thu, 1 Feb 2007 00:32:58 -0500
List-post: <mailto:towertalk at contesting.com>

I have a related question: How close to the tower can the shunt wire be?

I'm putting up a 3-stack of 4-el SteppIRs on TIC rings (the top one is up
already.) A shunt feed wire would have to be threaded through the TIC rings,
giving it only a few inches of clearance from the tower and ring. Assuming I
can fabricate standoffs that will keep the wire from touching any metal
parts, will the proximity of the wire to the tower and/or ring cause
problems? One person suggested spacing the wire further from the tower
between rings, then looping in to thread through each ring. Any reason to do
that?

Perhaps I should consider a different type of antenna for 160m?

73, Dick WC1M