The thickness of the radiating elements have a lot to do with the bandwidth
experienced for an swr below x:1. But swr is not important – what is important
is keeping the “dumped” power from the 4-square below ~5% (50 watts on 1,000 w
forward.) If you use a wattmeter you shouldn’t see any swr but if you put
another wattmeter on the cable to the dummy load from the 4-square, you will
see the dumped power on the meter.
I use #12 pvc coated wire and get a bandwidth of ~ 200 khz. Others that I know
use wire in conjunction with four Rohn 25 tower sections and they can cover
from 3.5 – 3.8+ mhz.
73
Bob KQ2M
From: Paul F. Merrill
Sent: Monday, October 28, 2019 3:55 PM
To: towertalk@contesting.com
Subject: [TowerTalk] TX 4SQ Bandwidth - 80 and 160
OK, so this is marginally-related to towers...
Anyone with 4SQ TX arrays, how much 2:1 SWR bandwidth do you get in the
real world?
Thanks, Paul
W7IV / KK6P
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