[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


More information about the PVRCNC mailing list