[Antennas] inverted L

G B microsys at alltel.net
Wed Apr 18 15:24:34 EDT 2007


Hello,

Well I found the problem with the 160M resonance.  I believed ON4UN's book,
and
it clearly has wrong info in it.

I adjusted the 160M leg after the trap by a whopping 20 feet, and got it in
range.
ON4UN said 83 feet after the trap, and it is more like 63 feet.

I rechecked the 80M resonance, and it did not change at all, which is what I
expected.

Both antennas have poor bandwidth.  Since this is my first inverted L,
perhaps this is
the way they are.


So, my initial problem is with the trap I believe, and I can work on the
ground system
later.  From what I read, I can add radials up to 64 to improve the antennas
performance.
After 16 radials, it seems that the match will not change much, so if I
discover what this
resonance problem is, then adding radials should not alter the match.

73's

Glen K4KV




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