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Re: [TowerTalk] Which Balun with the TH7DXX

To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] Which Balun with the TH7DXX
From: "Peter Voelpel" <dj7ww@t-online.de>
Date: Tue, 23 Jul 2013 00:54:40 +0200
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
A solenoid winding made of coax is more effective then those 4 wraps.
I use SCF12-50 Cellfex to wind my choke baluns.
30 turns on a pvc tube of 4-5" diameter do the trick (2000 ohms at 14MHz).

73
Peter

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Jim
Thomson

##  coiled up coax is not the answer either, the Z is  too low.   Like
gerald sez,
the wire leads on the baluns output is part of the total DE ele  length. 
So if using coax... factor that in...and make the Y the correct length. 

##  4 wraps  of  213 U around   4 x 2.4 inch OD    type 31 ferrite will do
the trick
for a balun....

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