[Antennas] measuring SWR

2003年5月10日 15:31:44 -0500

"Douglas J. Koehler" wrote:
> Mike,
>> I've built around a dozen j-poles and variants in the past 10 years and
> what you've got is an impedance mismatch. Your feedline is 50 ohm
> unbalanced and your antenna is probably around 300 ohms unbalanced.

Now I also have built dozens of "J" Poles in my almost 30 years in this hobby,
And the above statement is a bit confusing to me,
Yes the balanced to un-balanced thing is correct,, BUT,, I beg to differ on the
300 ohm statement,, IIRC the position of the taps determine the antennas
impedance.
0 ohms at the base of the stub (connected to the short) and nearly infinite at
the end of the stub. or at least several thousand ohms,,
and everywhere in-between from 0 to the infinite. That's why they are soo very
easy to match..
Joe WB9SBD