[TowerTalk] Balun on LPDA

[Peter Voelpel]

Hi Greg,

I am using a KLM logperiodic, it´s the model 10-30-7LPA with 7 elements.
Yes, feed impedance is balanced 200 ohms.
The balun does two things: impedance transformation and conversion from
balance to unbalance.
If you feed with open wire you have to convert to unbalanced 50 ohms at the
other end, so using a balun at the feedpoint is preferable.
I did not like the original KLM balun so wound my own on two large ferrit
cores, it is very flat from 6-60MHz.

73
Peter


-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Greg S

I intend on installing an LPDA (KLM) that specs out a FP Impedance of 200
Ohm, and recommends a 4:1 Balun to transform to 50 Ohms for feeding with
Coax. Fine there, I can understand.

My question is: What if I would try to feed it with ladder line/open wire,
with no balun. Is not the antenna a balanced design, somewhat?