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Hi Laurie, About your antenna . Did you find that the
extra wire allowed you to reduce your loading coil? I am thinking
about Big Pond again.
I looked at my computer last
night . I couldn't find any images . I probably didn't bother
because I thought the frequencey was wrong,sri
Saw nil last night
I will look again tonight if you or Peter will tranamit, or anyone else
for that matter . Again I will be using 30 sec dots so all should
be between 91.920 and 71.926 kHz 73 de John VE1ZJ
Laurie Mayhead wrote:
During
the T/A tests last winter I ran out 2 additional radials 150 ft. long
into the sea water with 4ft long earth rods. Recently the grass had to
be cut so I brought these radial in,carefully checking the Ant. current
with and without the radials. NO DIFF!This
brought me back to the" wire in the air theory" and I did somthing that
I have been planning for some time. I added an extra 180 ft in the zig-zag
configuration,in spite of the fact that Eznec recons that my top load is
long enough to have linear current in the vert. section,and no improvement
to be gained from the additional wire in the air.(Rad. res. only increasing
from 0.069-0.070ohms). But Eznec doesnt adequately simulate
currents in the ground at these frequencies. So I checked the Ant. current
before and after. Before 3.2A after 3.7 Amps!!!Very
worth while,and once again "Wire in the Air" is vastly superior to wire
in the ground.,at my location at least. My 350mwERP
is now 450mw ERP.Antenna
now 48ft high, vert section 42ft from top of loading coil. Horizontal
top 650 ft (apart from last 180 ft which slopes to 40 ft.Top
wires in zig zag config. 73s Laurie.
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