On Thu,4/21/2016 6:42 AM, Jim Thomson wrote:
Date: Thu, 21 Apr 2016 03:28:00 -0400
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] CMC-230-5K
I don't have any antennas that cover 3-30 MHz so why would I need a
choke that covers that range? A quickly wound choke for the specific
antenna is more than sufficient. Only if you want a choke for all the
HF antennas you "might" put up would that bandwidth be justified. I do
have two chokes in series on 75/80.
### I only have ONE feedline going up the tower. The remote switch box is at
the
top of the tower. For this application, for experimental purposes, I want to
be able
to quickly move the CMC from one ant to another to another, so it has to
cover at least from
160-15m.
Your plan is wrong. A choke is most effective at the feedpoint, not some
fraction of a wavelength from the feedpoint, as it would be at a switch.
I also want to evaluate the effects of cascading both boxes in series, on
each of the
160-15m ants. For this series of tests, it will only see a max of 1200w pep
out on ssb..and flat
swr across each band. So Im not concerned about heating.
Again, don't believe advertising claims about power handling, especially
from a new vendor with little experience in the application of his product.
I also want to try one then both of em
on the output of the 1200 w amps.
WHY? There's no common mode at the output of an amp or in your shack
unless you haven't grounded the coax shield at the entrance. You have
done that for lightning protection, right?
73, Jim K9YC
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