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Re: [TowerTalk] CMC-230-5K

To: towertalk@contesting.com
Subject: Re: [TowerTalk] CMC-230-5K
From: Bob K6UJ <k6uj@pacbell.net>
Date: Tue, 19 Apr 2016 07:54:24 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Jim,

Very well built. I am curious about one thing. Their write up states that this unit
uses 4  cascaded ferrite cores.  In the picture I can only see 2.
Thanks for sharing !


Bob
K6UJ



On 4/19/16 3:30 AM, Jim Thomson wrote:
I just received a pair of  CMC-230-5K  common mode chokes...from MyAntennas.com 
to experiment with.
They are configured as a  line isolator, with  silver-teflon  SO-239s  on each 
side.  They can also be configured as
a balun, with a pair of standoffs on the balanced ant side if you like.   
Extremely well designed and built, better
than I expected.   He does a beautiful job of terminating the coax.  I will try 
some different placement configurations,
including both in series, also in different locations.
2-30 mhz rated, 7k - 12.2k Z...with RS slightly less, 5.4K – 11.3k   5 kw icas.
If this doesn’t do it, I give up, esp with 2 of em in series.   Rated for 40db 
of common mode attenuation...per  unit.
Should be 80db  for a pair of em in series.   They are heavier than I thought, 
and UV proof.
This will be an interesting experiment.  If I can dump some noise on RX, I will 
be happy.   Stay tuned.
http://myantennas.com/wp/product/cmc-230-5k/

Jim  VE7RF
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