Topband: Inverted L...from N0AH

[Dinsterdog@aol.com]

My Inv L is for 160 mters is 128 feet long. It is a true 1/4 wave.  The nice 
thing about using a pure 1/4 Inv L, is that you can use a Amidon Unbalnance 
to Unbalanced transformer (UNUN) to match the impedence of the coax (50 ohms) 
to what ever the impedence of the Inv L will be (it will seem to range from 
50 ohms with no radials down to 17 or so ohms with lots of radials for 160 
meters)  as you add radials, you will see the SWR go up, as does the ratio of 
the impedence mismatch- but don't sweat it- your only improving the ground 
system and the SWR should still dip at your most resonant point- even if it 
is 7:1................when you match the feedlines, using the UNUN, you will 
have a great match!  My Inv L only goes straight up 55 feet- the rest is 
pulled away from the tower about 160 feet leaning towards EU- I use a single 
4 foot stand off on the tower and a pully put onto a  2x2 8 foot piece of 
redwood to hang the antenna about four feet of the side of the tower- - easy 
stuff but can take awhile to figure out-  I have 90 1/4 radials, all laying 
on the ground secured by landscaping spikes- 73  Paul  N0AH



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