Date: Fri, 30 Mar 2018 07:22:18 -0400
From: "N2TK, Tony" <tony.kaz@verizon.net>
To: <topband@contesting.com>
Subject: Topband: 160M Balun
<I shunt feed my tower for Topband. Presently using a Comtek 100 bead balun.
<After reading K9YC's article on baluns it would seem that a stack of five
#31 cores with 7 turns of coax would be a better balun.
<Would I notice an improvement in any way by switching baluns?
<If the answer is I would notice an improvement what about using sixteen
<turns #12 THHN wire on #31 core as shown in K9YC's article? How many cores
<would I need for 1500W?
<Tnx for any feedback
<N2TK, Tony
## Although 7 turns of 213 sized coax through 5 x type 31 cores
works good
on 160m... aprx 5 k ohms, the choke will resonate on 3 mhz ! You cant get
more than
7 turns of coax through a 2.4 inch OD / 1.4 inch ID core. The 160m CM
choke needs
to resonate lower in freq. It requires more cores to shift the res freq down.
I dont
know how many more, but I suspect 7-12 cores would do the job, and
certainly
be an improvement. You wont blow it up either.
## I suspect your current bead balun wont provide very much Z on 160m..and
it
will all be reactive.
Jim VE7RF
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