"denton" wrote in message
...
Hi all...
I am starting to work on something to use on 160 thru 20 meters.
I currently have an aluminum mast that is 32 ft long with a small cap hat
on
top.
the antenna will sit in the center of an area approx 50 z 50' (backyard).
I
plan to put down 40 plus radials, the majority which will be situated to
radiate out from the base of the vertical.
some will meander along the house foundation and property line..
I plan on also tying in the galvanized (not chain link) fence around the
back yard to the radial system, as well as the house plumbing.
40 meters should be direct feed.
I will homebrew a matching L network for use on 160 thru 60 meters.
I will also try a 20 meter tuning stubb.
Does anyone know what the size of the loading coil that MFJ uses in their
80
& 40 meter vertical?
I have read of just about everything I can find online of this sort of
project and have played with Eznec demo a bit and think this will be a
doable project.


Consider the input impedance on 160m. With 1.5 kW the voltage at the base
of the antenna is likely to be in the 20 to 30 kV range (about 5 - 7.5 kV
with 100 W) . Also for an "L" network, suggest you use a series "L", shunt
"L" configuration. Series "L" shunt "C" requires very large values for the
shunt capacitor.

73,

Frank (VE6CB)