On Jun 2, 2008, at 9:25 PM, Vic K2VCO wrote:
Brian Lloyd wrote:
1. What is the matching range of the KAT100, i.e. will it match an
antenna fed at a voltage node 2. Does the BL2 have a problem when
looking at a really high impedance, i.e. when center feeding a full-
wave doublet?
Maybe I'm missing something, but the answer depends on the length of
the feedline. If your feedline happens to be an odd multiple of 1/4
wl, then what the KAT100 and the BL2 will be dealing with will be a
very low impedance, not a high one. A half-wave feedline will repeat
the impedance at the feedpoint. And in-between lengths will give in-
between values.
I was aware of that too but still wondering what the worst-case is.
But I guess the real answer is, if it won't match, add more feedline
to move around the smith chart and try again. Good point.
The balun will operate efficiently as long as the impedance is
primarily resistive and in a range of a few tens to a few hundred
ohms. Reactance is bad for balun efficiency.
Ah. There is the answer I was looking for on the balun. Thank you.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
--
73 de Brian, WB6RQN
Brian Lloyd - brian HYPHEN wb6rqn AT lloyd DOT com
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