[Antennas] inverted L and trap

[DavidE Benedict]

***
Can you fix "the ground" (buried mesh or something) or raise the ant.?

David
W7DBH



microsys at alltel.net,Internet writes:
>Hello,
>
>Laid down a dozen radials so I could test the inverted L on 80 meters.
>
>First test with analyzer excellent, or so I thought, with nearly 1.1, 48
>ohms and 5 ohm
>X.  I know, that means the ground is not that great.
>
>But resonance point was at 3.68Mhz, and very narrow 2:1 swr bandwidth at
>70Khz.
>
>So, added nearly 3 feet, and rechecked.  Resonance only dropped 40Khz to
>3.64.
>
>This does not make sense to me, so my question is:
>Is the trap tuned wrong, to about 3.65Mhz instead of the intended 3.55Mhz?
>What effect on resonance will the trap have?
>
>Also, even though there are no 160M radials at this time, I cannot find
>the
>resonance point
>for 160M.  It looked like the analyzer was going from infinite to
>something
>lower at 1.7Mhz,
>it's lowest freq.
>
>The trap was made from internet program Coaxtrap I think is the name of
>it.
>8 turns, rg-8X
>foam coax on a 4.2" PVC drain pipe.
>
>Any suggestions?
>
>TIA
>
>73's
>
>Glen K4KV
>
>
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