Johann Höchtl wrote:

I built an "ugly" air wound balun on a PVC water pipe according to this
description
http://www.hamuniverse.com/balun.html

I get 24 turns on a pipe having 75mm (about 3 inches) diameter measured
outside.

But recently i had the chance to look up the section in the ARRL antenna
book and there the number of windings is considerably smaller at a
higher winding radius.

Which description is right? Or does either have advantages and drawbacks?

The optimum number of turns depends upon the band. Such a balun optimized
for 160m may not be effective on 10m and vice versa. OTOH, ferrite baluns
can be designed to function over a 10:1 frequency range by the proper
choice of the material for the toroid.
--
73, Cecil http://www.qsl.net/w5dxp


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