Topband: To Balun or not to Balun that is the question.

[Donald Chester]

>From: "i4jmy at iol.it" <i4jmy at iol.it>

>>By the way, depending the diameter of the coil, line lenght, and coil 
>>position, I'm afraid those 6 turns are not enough to have a good choke on 
>>20m.
>Expecially in cases where a choke is not on a current node, 10 ten times 
>ratio between reactance and 50 Ohm doesn't make at all a good one.
>Somewere I've seen claimed only 6 turns over 4" is a good choke for 20m, 
>while it's not.

It depends on what you are using the balun for.  I found 6 turns to be 
effective on 40m. in the shack between transmitter and ant changeover relay. 
  I had an rf feedback problem on that band, that wouldn't go away no matter 
what (copper ribbon ground strap, 1/4L ground radials under the floor, rf 
chokes, bypass caps, etc).  The 6-turn balun cured the problem immediately.

Don K4KYV

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