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Re: Topband: Testing for common mode noise

Subject: Re: Topband: Testing for common mode noise
From: Don Kirk <>
Date: Wed, 24 Aug 2011 07:00:23 -0400
List-post: <">>

 Jim K9YC said :

Second, a common mode choke does not in any way degrade 
the signal nor the performance of the antenna.

 but after more offline discussions with Jim about a posting by W8JI warning 
that a improper value common mode choke can actually make things worse, Jim 
clarified his statement as follows : "My advice is based on using a "good" 
choke -- that is, based on the    data in my RFI tutorial.  For an RX antenna, 
14-18 turns through a    single #31 toroid should be quite effective on 

Thanks to Jim and everyone else that responded to my posting. 

Don (wd8dsb)

UR RST IS ... ... ..9 QSB QSB - hw? BK

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