[TowerTalk] Ferrite, or choke baluns?

[W3YY]

Mike -

You beat me to the punch.  The Palomar "Balun Kit" was what I was going to
recommend, but I see, after reading the responses that you have already done
that.

I've successfully used these on 160 and 40.  I like the design.  No coils or
other components to break down.  Your coax goes directly to your antenna,
just as before, but now wrapped in a ferrite blanket.

This design, it seems, should handle high SWR without breakdown.  The only
failure modes I can imagine are over-voltage breakdown in the coax itself or
heating of the ferrites to the point of failure.

73, Bob - W3YY

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Michael Germino
Sent: Friday, January 18, 2008 8:01 PM
To: Jim Brown; towertalk at contesting.com
Subject: Re: [TowerTalk] Ferrite, or choke baluns?

Palomar Engineers have a "Balun Kit" that is basically Ferrite Beads that
you slip over your coax and some heat shrink that you use to keep them in
place.  $16.50 for the RG-8 one.
   
  What is your take on these, Jim?  Enough Ferrite Bead?  Seemed to work OK
for me up to 40 Meters.
   
  http://www.palomar-engineers.com/Balun_Kits/balun_kits.html
   
  Mike
  AD6AA
   
  

Jim Brown <jim at audiosystemsgroup.com> wrote:
  



For about $20 in toroids, you can BUILD a choke balun that is VASTLY
superior to anything you can buy for less than $100. The only choke balun
worth buying is made by DX Engineering, and they are big, heavy, and cost
about $130. They are EXCELLENT, but FAR too heavy to use at the feedpoint of
my dipole. :) 

See http://audiosystemsgroup.com/RFI-Ham.pdf 

and 

http://audiosystemsgroup.com/NCCC-CoaxChokesPPT.pdf

73,

Jim Brown K9YC



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