[TowerTalk] Question using balun on a hf beam

[jeremy-ca]

Placing a current balun at both ends could create more problems if the 
distance between them is resonant on a frequency of use.
It is pretty hard to predict any resonances especially with coax strapped to 
a tower but a wire antenna with a free hanging feed may be problematic.
I use a low power balun between exciter and its LPF and amp and another 
between amp and its own LPF and "assume" that the intervening circuitry is 
sufficient isolation.

Carl
KM1H



----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: "Tower Talk List" <towertalk at contesting.com>
Sent: Wednesday, June 27, 2007 11:11 AM
Subject: Re: [TowerTalk] Question using balun on a hf beam


> On Mon, 25 Jun 2007 20:03:31 -0500, Ken Shutt wrote:
>
>>You can also add a current balun in the shack.  AKA MFJ-915.  It should be
>>effective in reducing unbalanced currents on your coax.
>
> Not nearly as effective as putting it at the antenna. BTW -- a current 
> 
balun

> is a CHOKE, not a balun.
>
> 73,
>
> Jim Brown K9YC
>
>
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