Indy wrote:
I want to use my Elecraft BL-1 1:1 balun on field day.
The balun would serve as center insulator, but the coax line plugged
into it is a phasing line.
Here is my question: Will the windings on the balun, introduced
between the antenna and the phasing line, effectively increase the
length of the phasing line?
I think it will, and I am wondering by how much to shorten my phasing
line to account for it. I think the windings are six to seven inches
in length and would imagine the velocity factor to be high.
You said it's a phasing line, so I presume you have a multi-element
antenna. In this case, just use a similar balun in the same place on
all the elements. That will preserve the phase relationship.
If it's just one element, maybe you meant that the additional coax is a
matching section. In that case, you can use a 1:1 balun without
changing anything -- the impedance transformation required will be the same.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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