[RFI] RFI Digest, Vol 163, Issue 6

[Wes Stewart]

Yep, all of that current could be common-mode :-)



Date: Fri, 5 Aug 2016 08:49:52 -0700
From: Danny Richardson <k6mhe at k6mhe.com>
To: rfi at contesting.com
Subject: Re: [RFI] Balanced-line antennas and couplers
Message-ID: <42f9a133-9c76-b133-1601-4039cf5def62 at k6mhe.com>
Content-Type: text/plain; charset=windows-1252; format=flowed

Identical current indication on a matched pair of thermocouple RF amp 
meters do not necessarily mean the transmission is balanced as the 
current magnitudes might be equal but the 180? phase difference isn't.

Roy explains this situation one page 4 of his paper /"Baluns: "//What 
they do and how they do it//."/ that can be found at:

http://eznec.com/Amateur/Articles/Baluns.pdf

Danny, K6MHE


On 8/5/2016 7:30 AM, Kenneth G. Gordon wrote:
> On 5 Aug 2016 at 5:19, Rob Atkinson wrote:
>
>> Balanced line operators need a pair of identical thermocouple amp
>> meters.
> Yes. Got any recommendations on which to use? There are at least a couple of schematics
> and articles on home-built units on the web. What do you use?
>
> I have a link-coupled home-brew balanced coupler I built many years ago which I am going to
> use with my "new" Vertical Vee-Beam antenna as soon as the Swainson's Hawk family which
> has taken up residence in my only support (a 110' tall Grand Fir Tree) leave this fall.
>
> So, I want to install a pair of RF ammeters to help me achieve balance.
>
> Ken W7EKB
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End of RFI Digest, Vol 163, Issue 6
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