[TowerTalk] TX 4SQ Bandwidth - 80 and 160

[Bob Shohet, KQ2M]

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 at 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