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Mechanical considerations
50turns of 5mm wire base loaded coil is more
efficient than 100 turns of 1mm wire centre or top loaded to resonate the same
vertical.
I have experienced this on 160m mobile
loading coils years ago.
Of course if your vertical would take the strain of
100 turns of 10mm centre or top loaded you would gain on Rr of maybe 0.00037
ohms on 500 khz.
g3kev
----- Original Message -----
Sent: Friday, February 27, 2009 6:16
PM
Subject: LF: Ground system
MF
A couple of elevated insulated radials will out
perform dozens of buried radials, in fact 1 radial is vy effective, even
insulated radials lying above ground are also efficient.
I use 2 insulated 1/4 wave elevated radials on
500 khz and several lying on the ground for 137 khz.
Using a loading coil in an elevated position on a
vertical helps but remember twice as many turns are required as opposed to
base loading hence more resistance, you might not be gaining as much advantage
as you think.
de mal/g3kev
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