6 square antenna

Fri Sep 30 12:29:40 EDT 1994

I wounder if there is anyone out there that has tried the
6 square ant (similar to a 4 square) and if so how the
phasing/power splitting was solved.
Don't know if 9V1XQ is the "inventor" of this antenna but
I have seen some MN config files that came from him.

73 de Jim SM2EKM  email: jeh%kiona.dnet at hk.mobitel.telia.se

>From Tony Brock-Fisher <fisher at hp-and.an.hp.com>  Fri Sep 30 11:35:56 1994
From: Tony Brock-Fisher <fisher at hp-and.an.hp.com> (Tony Brock-Fisher)
Date: Fri, 30 Sep 1994 06:35:56 -0400
Subject: advice on ferrite beads for RF coax chokes needed
Message-ID: <9409301035.AA08653 at hp-and.an.hp.com>

Tom-

Think of a bead on the coax as a series L and series R. If the bead 
material doesn't give enough L, you just need more of them on
the cable. The length of beads doesn't matter, just the number.
Theoretically the beads don't have to be right next to each other - 
they could be 5 feet apart and still do the job. As far as how many
is enough, the idea is to raise the impedance for signals travelling
on the outside of the cable. As you do this, the amount of current 
that flows decreases. It never goes to zero, but at some point it
gets small enough so you don't care any more. We use some big beads
here at work, and if you put one turn of wire thru them and measure
them with a Z-bridge, they look like about 70 ohms reactive. Using
the usual rule of thumb for this sort of thing, if you get 4-5 times
as much reactive impedance as the resistive impedance of the circuit
(50 ohms), you're essentially there. So that says about 3-4 of these
should do it. This bears out my experience at home. ( I always start a
contest with a full coffee pot and a full box of beads. If something
doesn't work, first throw a bead on it. Then have some coffee!)

-Tony, K1KP, fisher at hp-and.an.hp.com

>From gjk at hogpa.ho.att.com (Gerald J Kersus)  Fri Sep 30 13:07:59 1994
From: gjk at hogpa.ho.att.com (Gerald J Kersus) (Gerald J Kersus)
Date: Fri, 30 Sep 94 08:07:59 EDT
Subject: PHASED Half Squares!
Message-ID: <9409301207.AA03396 at hogpc.ho.att.com>

I, too, started looking at phasing two half-squares for 40M.  The patterns
using ELNEC look pretty promising.  However, looking at the resulting
impedances of the two antennas was discouraging -- the matching network
would not be very simple.  I started modeling another arrangement inspired
by K3LR's QST article on his 160 M array.  Feeding one antenna and adding
the right amount of inductive reactance to the other produces pretty good 
results using ELNEC. With 24 feet of separation and a 40-ohm load at the 
feed point of the "reflector", ELNEC shows a gain of 7.2dBi and a F/B of 
15 dB.  Not too shabby for a wire antenna up only 40 feet and  that doesn't 
eat up a lot of real estate.  

My main problem was finding the four trees tall enough and the right distance
apart (and also oriented so I can point the antenna to Europe).  I've found
the trees and put up one of the antennas, but it doesn't work as well as a
test antenna I put up a month ago.  It may be too close to the tower. (One
end is only about 25 feet from the tower.  ELNEC indicates that this should
be ok, but there may be interactions with other antennas.  K2PH came over
last night with his new Autek RF analysist.  The antenna is resonant about
where it should be.  We need to analyze the readings to figure out how to
make it play better before I take the time to put up the second
half-square.  (My wife asks why I always wait until a month before CQWW
to start these antenna projects.)

Gerry, W1GD

>From Douglas S. Zwiebel" <0006489207 at mcimail.com  Fri Sep 30 04:28:00 1994
From: Douglas S. Zwiebel" <0006489207 at mcimail.com (Douglas S. Zwiebel)
Date: Thu, 29 Sep 94 22:28 EST
Subject: Hello Indianapolis types!
Message-ID: <90940930032809/0006489207PK3EM at MCIMAIL.COM>

I will be in the land of the speedway for a business type event this Monday.
I will arrive sometime (late afternoon) on Sunday.  Anybody home wanna
share a gab?
de Doug/KR2Q
KR2Q at MCIMAIL.COM

>From p_casier at ub4b.eunet.be (Peter Casier)  Fri Sep 30 14:59:32 1994
From: p_casier at ub4b.eunet.be (Peter Casier) (Peter Casier)
Date: Fri, 30 Sep 1994 14:59:32 +0100
Subject: Announcing OT4T, CQWW phone
Message-ID: <199409301359.AA24452 at ub4b.eunet.be>

OT4T will be our M/S effort in the upcoming CQWW phone test, running from
the QTH of ON4UN.
Ops: ON4WW, ON4UN, DL1SBR, DJ4AX, DL5XX, DK1FW and ON6TT, assisted by a
vaste group of spotters.
Unfortunately, F6EXV, who helped us ending as #1 EU M/S last year, is still
in Africa and will not be able to join us.

QSL (will be a multi-colour card) via ON4UN

Skeds with DX stations would be appreciated.

73-Peter
ON6TT.

p_casier at ub4b.eunet.be