[TowerTalk] 5 band antenna file

Johan Van de Velde johan.vandevelde@ping.be
Mon, 10 Aug 1998 11:05:18 +0200


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Hello,
Some antenna design work for a change.

I have a boom 15m long and 4 inch in diameter.
I've been playing with a design 14-28 Mhz and 13 elements.

I've been modeling this with YO and AO sofar.
Can anyone give me a second opinion on the thing i brewed..

I get an average gain of over 8dBi free space ( average 4el monobander)
F/B varies 20 to 30db
SWR should be less than 1.5 bandedges ( except 28 , usefull BW 28 to 28.7)
I chose to have gamma matched or similar matching system


ON4ANT,  <johan.vdv@tornado.be>
ICQ # 16827452
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Content-Description: 14-28xl.ant (ANT File)
Content-Disposition: attachment; filename="14-28xl.ant"

14-18-21-24-28 yagi
Free space
;14.150 MHz
;18.118 MHz
;21.200 MHz
;24.940 MHz
28.300 MHz
13 wires, meters
r = 5.45		;reflector20
s = 5.2			;driver20
t = 4.9			;dir 20
a = 4.15		;reflector 17 + director2 20	
b = 4			;driver 17 
d = 3.64		;dir 17 + refl 15
e = 3.395		;driver 15
f = 3.02		;dir 15 + refl 12
g = 2.91		;driver 12
h = 2.72		;dir 12 + refl 12
i = 2.56		;driver 10
j = 2.355		;dir1 10
k = 2.265		;dir2 10
;
pr = 0			;refl 20
ps = 2			;driver 20
pt = 3.6		;dir 20
pa = 5.25		;refl 17 -dir 20
pb = 6.2		;driver 17
pd = 7.2		;dir 17 - refl 15 
pe = 8.4		;driver 15
pf = 9.5		;dir 15 - refl 12
pg = 10.3		;driver 12
ph = 11.6		;dir 12 - refl 10
pi = 12.45		;driver 10
pj = 13.4		;dir 10
pk = 14.8		;dir2 10
dia = .02		;tubing diameter --> must be tapered
;
1     pr -r 0    pr r 0   dia   ;14 refl
1     ps -s 0    ps s 0   dia   ;14 driven
1     pt -t 0    pt t 0   dia   ;14 dir
1     pa -a 0    pa a 0   dia   ;18 refl
1     pb -b 0    pb b 0   dia   ;18 driven
1     pd -d 0    pd d 0   dia   ;18 dir2 - 21 refl
1     pe -e 0    pe e 0   dia   ;21 driven
1     pf -f 0    pf f 0   dia   ;21 dir1 - 24 refl
1     pg -g 0    pg g 0   dia   ;24 driven
1     ph -h 0    ph h 0   dia   ;24 dir1 - 28 refl
1     pi -i 0    pi i 0   dia   ;28 driven 
1     pj -j 0    pj j 0   dia   ;28 dir
1     pk -k 0    pk k 0   dia   ;28 dir 2
1 source
;Wire 2, center    ; driver 20
;Wire 5, center    ; driver 18
;Wire 7, center    ; driver 15
;Wire 9, center    ; driver 12
Wire 11,center	   ; driver 10

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