Rick
My inv-L is 60' vertical plus 75' +/- sloping down and away from the tower
(70' topped with an X7). There is 6' separation between the tower and vertical
wire. I also use the tower as a folded monopole on 80. Consequently it is
tied to the radials (100 x 65').
I found I needed to use a series cap between the coax and vertical wire. I
think I wound up with 2 or 300pf. You could try a 2 section BC variable to get
an idea. In my case, the horizontal wire started out at almost 85'. I had to
go back and forth between trimming that and tuning the cap. Eventually I had
a very nice match at 1835. If this works for you, you can then improvise a HV
cap by using 12" pieces of scrap RG8. Each piece will contribute about 28 -
30pf (make sure you maintain 1/2" or so separation between braids and center
conductors).
I used an MFJ269 at the base for tuning. It was oblivious to a 10Kw BC
station 5 or 6 miles north of me.
73 and GL
Bill
K2EK
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