[Antennas] inv L (W7DBH do-over)

[DavidE Benedict]

microsys at alltel.net writes:
>Hello,
>
>Since no one answered my question about antenna resonance and the trap
>frequency, I decided to change something, and see what happened.
>
>I added 1/2 turn to the trap.  An immediate and dramatic difference.
>the resonance went from 3.64Mhz to 3.48mMhz.  Took off 3 feet from the
>80 meter side, got resonance to 3.508.  Took off another 8", but no
>effect.



Amazing...

I wonder if this is the same effect which comes in to play when tuning an
ant. matcher.
-- at a given inductance & freq., adding or subtracting capacitance beyond
certain high & low capacity points has little effect.

I am guessing that the horizontal leg of the Inv L is primarily "capacity
hat" (more or less capacity with more or less horizontal length), maybe
that's incorrect, I don't know...but, being that the horizontal leg is
barely directive leads me to believe I am right...that it is mostly the
capacity factor of the antenna system. 

So, adding or subtracting horizontal inches beyond certain points (at a
given inductance and freq.) is possibly, practically speaking, fruitless. 
...just theorizing from gross ignorance.

David B.
W7DBH