Semantics.......be it a UNbalanced to UNbalanced Balun, RF Common Mode
Choke, 1:1 balun, RF Choke or whatever, yes the objective is to provide a
high Z for circulating current on the outside of a coaxial feed. Most SWR
devices can not deal with outside circulating currents. The basic
description of the problem does indicate a coaxial line is being used since
there is reference to SWR values as measured with internal means.
I've had very good success with the #8232 wired model and the #8332 kit
model from The Wireman. These are the better choices if any anticipation of
160M operation is expected.
As to the discussions between W2DU and W1ICP, I'll add in those further
discussions by W2FMI.
73
Bob, K4TAX
----- Original Message -----
From: "Kim Elmore" <cw_de_n5op@sbcglobal.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, April 21, 2013 7:23 PM
Subject: Re: [TenTec] Built in SWR meter bannans
Maybe "unun" and "balun" don't really apply here. Walt Maxwell, W2DU, and
Lew McCoy, W1ICP, were famously at odds about whether the W2DU "balun" was
really a balun or something else. Walt said yes, Lew said no. What you
want to do, Jim, regardless of what we call it, is to alleviate the
current on the outside of the coaxial transmission line. The Wireman's
product 8232 will do just that.
If it's common-mode current on ladder line that you have to wrestle, the
problem harder is harder in a practical sense even though the same
techniques still apply.
73,
Kim N5OP
On 4/21/2013 5:57 PM, Bob McGraw - K4TAX wrote:
Sounds like RF current on the shield when on the antenna and not on the
dummy load. I suggest a 1:1 UNUN balun between the amp and the antenna.
I've had good success with a product from The Wireman being model #8232.
Certainly worth a try.
73
Bob, K4TAX
----- Original Message ----- From: "Jim GM" <jim.gmforum@gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, April 21, 2013 11:13 AM
Subject: [TenTec] Built in SWR meter bannans
I have a Tec Tec Auto Coupler that is turned off and a Ten Tec Hercules
II
at full power. The SWR bridges in side the equipment reads well over SWR
over 3:1 on certain bands while my BIRD Watt meter read 2:1.
ALL SWR meters is at 1:1 into a dummy load so that rules out the BIRD is
whacked.
This problem seams to mainly happen on 160M however I have seen it do
this
on different bands with other antennas in the past.
Are the diodes going into saturation? I am going BANNAS with this
issue.
--
Jim K9TF
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