[TowerTalk] Which Balun with the TH7DXX

[Bert Almemo]

4-5 turns with 4 x 2.4" OD #31 ferrites is more effective than the 30 turns
on the PVC pipe! Probably double the choking impedance!

73 Bert, VE3NR



-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Peter
Voelpel
Sent: Monday, July 22, 2013 6:55 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] Which Balun with the TH7DXX

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 at 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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