What is a choke Balun??
Mike Michon
AB5XP
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> From: w8ji.tom <w8ji.tom@MCIONE.com>
> To: zeitler@ibm.net; towertalk@contesting.com; topband@contesting.com
> Subject: Re: TopBand: 75 meter vert. fed with open wire
To: <topband@contesting.com>
> Date: Tuesday, October 20, 1998 8:52 AM
>
>
> Hi Lane,
>
> > I just finished putting up a full size 75 meter 1/4 wave vertical. Roof
> > mounted (actually next to the roof but close enough). Of course all
> radials
> > are elevated. Six of them are 46 feet long. Two are 66 feet long. Open
> wire
> > feed is 450 ohms.
>
> The feedline will be part of the antenna and radiate in this setup Lane.
> Feeding an unbalanced antenna with a balanced line is a poor method. You
> can only cure the problem with a choke balun at the antenna terminals
(and
> also one at the other end if you aren't using a balanced tuner).
>
> > I am using it on all bands 80-10 meters. Really seems to hear and xmit
> well
> > (subjection only). Was wondering what the take off angle is on the
other
> non
> > 75 meter bands?? Does it get lower as the freq increases or does it get
> > really complex??
>
> I'm sure it gets pretty complex, especially since the feedline is
certainly
> contributing to radiation. Wave angle should increase with increasing
> frequency.
>
> Like with all antennas, the only thing important is how well you like it
> and how you feel it works. That's always much more important than what is
> really going on.
>
> 73 Tom
>
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