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Old December 12th 05, 12:30 AM posted to rec.radio.amateur.antenna
Jim - NN7K
 
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Default Antenna Modeling (dumb question#305)

Hi.all, and BTW, Happy Holidays! Am attempting to model
a "Cushcrunch" A-627013, yagi and have it all but written,
and modeled what I have of it-- It is a 70 cm, with 6 and 2
meter yagis, the 6 meter horizontally polarized, both the
2 and 70 cm are vertically polarized, on the same boom, ofset
by aprox 1 inch , and the beast is mounted on a mast, 6 inch
from the two meter reflector. This is the first time attempted
modeling a multi band antenna, especially with the mast in the
same plane as the yagi. My question is 2 fold: 1; Given it is
behind the reflector, just how much diff does THAT add to the
pattern of the antenna, and 2; If it does, just HOW LONG an
element would this represent?? The mast length? and for the
small portion of mast, ABOVE the mast clamp?? Just curious
as to the effect it has . Your thoughts , please. Jim NN7K