[PVRCNC] Jan/Feb NCJ

[Howie Hoyt]

Hi Brian -

Well, my personal  belief is the S40 would beat out the 4sq [on 40M].

Having said that, I have a 4L fixed yagi on 80M that I can compare to a 
80m 4sq.
The 4L beats it but not by a lot (in terms of signal heard)-hey, we are 
REALLY into diminishing returns ;-).

Comparing a 4sq to a low 2L on 80M, I would prefer the 4SQ:
1) High Q of the wire yagi keeps it usable only 3500-3550 whereas 4sq 
easily goes 3.5 thru 3.6
2) 4SQ steerable whereas 2L wire is fixed.
I would also be skeptical the 2L fixed would typically outperform the 
4sq in its' favored DX direction. Admittedly this becomes largely a 
function of 2L height. A half wave on 80 or 160 is pretty high whereas 
not such a challenge on 40M.
(I have had excellent luck over the years using 2L fixed quad on 40M 
using a boom fixed on the tower up 85' or more).

Altho we use ice419 & w3nqn filters, I think qtr wave stubs probably 
give a good accounting.

73, Howie N4AF

alsopb wrote:
> 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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