[TowerTalk] TX 4SQ Bandwidth - 80 and 160

[tony.kaz at verizon.net]

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
_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk