[TenTec] Built in SWR meter bannans [common mode UNUN location ]

[Bob McGraw - K4TAX]

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 at earthlink.net>
To: "Discussion of Ten-Tec Equipment" <tentec at 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 at Blomand.net>
> To: "Discussion of Ten-Tec Equipment" <tentec at 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 at gmail.com>
>> To: "Discussion of Ten-Tec Equipment" <tentec at 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
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>
>>
>>
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