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[TowerTalk] Question about triband Quad.

To: <>
Subject: [TowerTalk] Question about triband Quad.
From: (
Date: Sun, 3 Feb 2002 01:02:18 EST
In a message dated 2/2/02 6:23:59 PM Pacific Standard Time, 

> I have recently put together a 2 element triband quad. 20 & 15 M work good, 
>  with a under 2.0:1 over full band (<1.4 over most).
>  10m VSWR is unacceptably high (3:1 or so over full band.
>  I have checked all connections and dimensions, all OK. Feed is a single 
>  line through a balun and then a length of 75 ohm twinlead to a common 
>  connection of all three bands. 
>  I arranged to isolate just the 10 m DE, and it shows a 2:1 VSWR over band.
>  I was under the impression such antennas were common an presented a good 
>  match on all bands.  I plan to test the balun soon, and also considering a 
>  2:1 W2FMI transformer.

    You'll have problems when you feed a quad with the feedpoints tied 
together and using one feedline; the 20M loop will radiate when you're on 10M 
(14 & 28 mHz). Use 3 feedlines and your problems should be minimized. 

Steve    K7LXC
Tower Tech 

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