I used Teflon coated #14 gauge silver wire to wind a 160-20m 4:1 2Kw balun
on three cores. The thing has been working great for over 20yrs with legal
limit feeding 450ohm ladder line to 160m dipole.
I got the balun kit from Fair Radio Sales...not sure they still offer the
kit.
73,
Dave
Wa3gin
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Jim Brown
Sent: Tuesday, February 01, 2011 2:40 PM
To: richard@karlquist.com
Cc: towertalk@contesting.com
Subject: Re: [TowerTalk] Balun for G5RV
On 2/1/2011 10:36 AM, Rick Karlquist wrote:
> Alternately, you can make these out of "monster" speaker cable
> or 12 gauge low voltage sprinkler zip cord
One advantage of THHN is that the insulation is rated for 650 volts RMS.
That yields 1300V between conductors, so the choke will tolerate
significant SWR. A second advantage is cost -- THHN is really cheap,
while those exotic speaker cables are wildly overpriced. A third
advantage is the really nice impedance curve (measured) of the THHN
chokes (nicer than enameled bifilar, and much nicer than coax). I
haven't measured a choke wound with exotic speaker cable.
73, Jim K9YC
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