[PVRCNC] Jan/Feb NCJ
alsopb
alsopb at gloryroad.net
Wed Dec 14 08:33:23 EST 2005
Guys,
Anybody out there get this issue.
According to the contest rate sheet posting there are some articles of
real interest in there.
1) Comparison of 40 meter 4 square with 2el "shorty 40".
For years, I've wondered if a four square could compete with such.
Also what would be the implications for 80M. I've always held that
the reason 4 squares are so "great" is that they are compared to
inferior antennas -- e.g. dipoles on 80 at 0.25 wavelength up. Back
of the envelope calcs (mostly confirmed by EZNEC) here indicate that
the "gain" of a 4 square at best approximately equals that of a high
dipole-which gets ground reflection gain. The benefit of the 4 square
is all in the angle of radiation. However, the 4 square designs I've
seen had relatively few radials. My gut feeling is that all that
launch angle benefit is lost at low angles due to ground losses. I
wonder what the article has to say. I've tentatively concluded that a
fixed relatively low 2 el 80M wire yagi would outperform a 4 square to
EU --given typical installations of the 4 square with its ground losses.
2) Easy way to solve interaction in SO2R. Quarter wave stubs? Short
in the coax of one xcvr?
73 de Brian/K3KO
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