[TowerTalk] Fwd: Fwd: 4:1 balun questions KT-34XA

[Hans Hammarquist via TowerTalk]

Maybe I remember the length wrong. I am not at my shack right now. I do remember using 25 feet of coax. Do to the capacitive coupling between the turns, the Z goes down for higher frequencies.


In order to improve the higher frequency response I separated the turns slightly in one end of the coil, thereby reducing the capacitance between the turns.



I, originally, was intending to wind several coils for the different bands but found this coil to cover it all.


Hans - N2JFS



-----Original Message-----
From: Peter Voelpel <dj7ww at t-online.de>
To: towertalk <towertalk at contesting.com>
Sent: Wed, Oct 29, 2014 8:02 pm
Subject: Re: [TowerTalk] Fwd:  4:1 balun questions KT-34XA


I would expect Z to be higher on 60MHz then on 1.8 MHz.
With the outside diameter of 5mm for RG58 40 turns would require a coil
length of at least 200mm ~ 8".

73
Peter 

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Hans
Hammarquist via TowerTalk

Myself, I am using a air wound coil, 40 turns of RG58 on a 4 1/2" D, 6" L
cylinder as the choke. No, it is not hanging in free air but is well
supported. End up to work well from 1.8 to 60 MHz. Has a Z=500 Ohm at 1.8
MHz and 60 MHz.


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