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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)
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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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