[TenTec] Built in SWR meter bannans

[Rick - DJ0IP / NJ0IP]

Dave,

Sorry, my memory failed me there.  
It was long ago that I did this.
I had to search for my notes and drawings (file).  Found them.

Actually I removed the center cable from coax, and discarded the shield and insulation. Then I put two pieces in parallel and ran them through the same beads; lots of beads.
Then I covered it with heat-shrink tubing and fed the open wire into one end, and connected the other end through a short coax stub to my antenna tuner.

So yes, I did use only the center of two pieces of coax, but they ran through the same string of beads, not separate beads.

73
Rick



-----Original Message-----
From: TenTec [mailto:tentec-bounces at contesting.com] On Behalf Of d.e.warnick at comcast.net
Sent: Monday, April 22, 2013 1:23 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Built in SWR meter bannans



I don't understand. in coax you are increasing rhe impedence to the common mode current on the shield, right? What would you be doing on the open wire? 

73 

Dave 

WA3F 



From: "Rick - DJ0IP / NJ0IP" <Rick at DJ0IP.de>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, April 22, 2013 3:15:21 AM
Subject: Re: [TenTec] Built in SWR meter bannans 

With openwire you can build a CMC choke just as easily as with coax. 
Only thing is, you have to build two of them so it costs twice as much. 

In fact you make your own coax CMC choke by placing beads over the coax and coating with heat-shrink tubing... you can just tape two of these together and use their center conductors for the connections. 

    What's in a name? that which we call a rose
      by any other name would smell as sweet; 

73
Rick, DJ0IP 



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 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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> TenTec at contesting.com 
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> 

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