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Re: Topband: Question on common mode chokes

To: Top Band Contesting <topband@contesting.com>
Subject: Re: Topband: Question on common mode chokes
From: Robert Harmon <k6uj@pacbell.net>
Date: Wed, 3 Jun 2015 13:21:21 -0700
List-post: <topband@contesting.com">mailto:topband@contesting.com>
Jim,

It will be interesting to see what others say but my take on this is that the 
tuner function is to provide an impedance match 
to the vertical and doesnt provide any choking.  You still should have the 
choke.

73,
Bob
K6UJ



> On Jun 3, 2015, at 9:42 AM, James Rodenkirch <rodenkirch_llc@msn.com> wrote:
> 
> I seem to recall, while reading up on common mode chokes, where I wouldn't 
> need one if I employ an autotuner at the base of the antenna...is that 
> true/factual?
> 
> I have an LDG Z11ProII autotuner right at the base of my vertical - I did add 
> a common choke at the input to the autotuner (21' of my LMR-400 coax wound 
> around a piece of 4.5" PVC for the low bands) but wonder if that is really 
> necessary.  
> 
> 72, Jim Rodenkirch K9JWV
> 
>                                         
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