In general, considering some length of feed line to the feed point of the
antenna, I prefer one of the following methods
Follow this sequence: Transceiver > Amplifier > SWR Bridge > Tuner > 1:1
Balun > coax to antenna.
Another and sometimes preferred sequence is this: Transceiver > Amplifier
> SWR Bridge > 1:1 Balun > Tuner > coax to antenna. This also works best
with a balanced line is connected to the tuner.
The point being, the UNUN should be located at the output of the SWR device.
If the equipment provides a internal SWR measuring method, then the UNUN
should be at the output of the equipment before the coax feed to the
antenna.
73
Bob, K4TAX
----- Original Message -----
From: "K7TXO" <gfstory@earthlink.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, April 21, 2013 8:49 PM
Subject: Re: [TenTec] Built in SWR meter bannans [common mode UNUN
location ]
Bob -
For the sake of discussion; for a 1:1 UNUN at the "shack" end of an
antenna cable, is there an optimal location for Jim to put this UNUN?
I mean, will placing it right at the back of his amplifier out connector
be appropriate or outdoors, just outside of the shack?
Gene / K7TXO
----- Original Message -----
From: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, April 21, 2013 3:57 PM
Subject: Re: [TenTec] Built in SWR meter bannans
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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