[TowerTalk] TX 4SQ Bandwidth - 80 and 160

[Wayne Kline]

Tony,

My 4 SQ is like Tim’s old design   modified Hy-Gain Hi=towers with aluminum stingers starting  @  2” and ending in 3/8 “

I lay each tower down ( hinged base) and tune the standing antenna at the base for 3.510 KHZ.

There are no feedline attached to the comtek box or the base of the other antennas .

Phase line are cut to 3.650 MHZ   when installed and measured dump power  @ 3.660.  is  5 watts  on the Bird

Dump powers A  band  ends  3.500 MHZ and 3.800  MHZ are about equal    110 watts on a 250 watt slug.

Antennas have 112 ¼ wave radials  each

Wayne , W3EA

PS I too ka lightning strike 7/17/19   and instaslled new feedlines and a DX.Eng 4 sq box …. I need to measure the dump power  but the SWR at the edges are about the same


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________________________________
From: TowerTalk <towertalk-bounces at contesting.com> on behalf of tony.kaz--- via TowerTalk <towertalk at contesting.com>
Sent: Tuesday, October 29, 2019 2:02:48 PM
To: 'Tim Duffy' <k3lr at k3lr.com>; 'Paul F. Merrill' <marinesvcs at gmail.com>; towertalk at contesting.com <towertalk at contesting.com>
Subject: Re: [TowerTalk] TX 4SQ Bandwidth - 80 and 160

Hi Tim
When you tune the individual elements what do you do with the other
elements? Do you ground or open the feedlines?
When you tune the elements I am assuming you are measuring right at the feed
point and not through the feedline from the Comtek box, correct?

Tnx
N2TK, Ton

-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Tim Duffy
Sent: Tuesday, October 29, 2019 1:08 PM
To: 'Paul F. Merrill' <marinesvcs at gmail.com>; towertalk at contesting.com
Subject: Re: [TowerTalk] TX 4SQ Bandwidth - 80 and 160

Hello Paul:

With my 80 meter four squares the VSWR at the TX port of the Comtek Systems
controller never is above 1.4 to 1 from 3.5 to 3.9 MHz.

My elements are tuned for minimum dump power at 3.650 MHz. To accomplish the
3.650 MHz center, the individual elements are tuned to 3.505 MHz.

My dump power at 3.650 is -26 dB down from the input power, which is less
than 4 watts with 1500 watts from the amplifier. At 3.8 and 3.5 MHz there is
about 110 watts in the dump load.

My 4 square elements are made of aluminum 60 ft towers starting at 22 inch
faces and tapering to 11 inches with a 10 ft "stinger" of 2 " aluminum
tubing.

73
Tim K3LR

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of 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
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