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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