Yea, that is what has been keeping me away from 160m. I have several on
going projects, and I can't start one of that magnitude now. Might have
room for a dipole, so will just have to try that. Once I order some
ladder line.
David Wilburn
[EMAIL PROTECTED]
Don Wilhelm wrote:
Dave,
As far as switching your loop to a 160 top loaded vertical, yes you can do
it remotely with relays and a matching network. If your goal is efficiency
on 160 meters, the relay switching os only a small part of the equation -
you must have a good RF ground for the vertical to work against, and that
menas lots of wires in the ground, radiating from the base of the antenna.
Some will tell you tht 120 radials will give optimum performance, but 16 or
more will give great performance as well. If the radials are buried, the
length is not critical, lots of short buried radials will do almost as good
as a moderate number of long ones - see the 160 meter antenna simulation
results that are outlined on L B Cebik's website www.cebik.com. More
information on low band antennas can be found in ON4UN's Low Band DXing
book - there are many possibilities.
For best results, put the 160 meter matching network at the base of the
antenna and match it to your feedline.
Since there are many possibilities, make some decision even though it may be
a compromise and you too can be successful on 'top-band'.
73,
Don W3FPR
-----Original Message-----
I am very much enjoying reading the discussions on wire antennas. I
have something I have been trying to figure out how to do for some time,
and thought this might be a good place to ask.
I have an 80m loop, up about 60 or 70 feet. Currently it is fed with
300 ohm line. All I could find at the time, as what I had left in 450
ohm line (after I helped my elderly neighbor get his antenna back up,
and gave him some of the ladder line) was not long enough.
Additionally, I went to the local hamfest this weekend and could not
find a single vendor selling ladder line, but I digress. I have
approximately 290 feet of wire in the air in a horizontal, triangular
configuration, fed with (soon to be) ladder line, a balun (1:1) and then
coax to the shack. Is it possible to switch this (seems possible from
what I have read) to a 160m antenna by taking one side to ground at the
balun and feeding the other side? If this is possible, is there a way
to do this remotely?
David Wilburn
[EMAIL PROTECTED]
K4DGW
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