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Old March 23rd 04, 01:14 AM
Jack Twilley
 
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"Tam" == t-tammaru Tam writes:


Tam Jack, For what its worth, I ran EZNEC on a 40m dipole at 17
Tam feet. I think you said yours was less than 20 feet up. For a flat
Tam top dipole, I got a resonant impedance of 23 Ohms. When I dropped
Tam the ends 15 degrees, the impedance dropped to 17 Ohms. Sort of in
Tam line with what you are getting. Also, with multiple dipoles the
Tam impedance will be less, because you can not completely ignore the
Tam other radiators. Maximum gain was in the straight up direction.
Tam Gain was about 6db down at 25 degrees elevation. On 15 meters,
Tam you have 4 lobes offset about 45 degrees from
Tam ends/broadside. Gain was about 3db down at 30 degrees elevation.

That doesn't look so bad at all.

Tam Why don't you post your complete configuration. Height at
Tam feedpoint, and length and end point height for the three
Tam radiators.

Over the next couple of days, I'll take some careful measurements of
the antenna, its supports, and the distance of everything from the
back of the house. The house was built in the 1940s and was
constructed with wood and concrete with a stucco finish.

Jack.
- --
Jack Twilley
jmt at twilley dot org
http colon slash slash www dot twilley dot org slash tilde jmt slash
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