Due on the unforeseen circumstances, i have to bring down my
Tribander Trap Dipole (40/20/10) & change to new one..do this Dipole with patient today, really give me very nice VSWR, which is
value 1:1 from 7.000mhz to 7.090mhz..very happy with this result..waiting for RST from any stations soon..the theoretically on 40m (7.000mhz) really impressed (
no tuner) & on
17m (18.150mhz) the VSWR is 1.6:1 & still ok..traps design using
Coaxial Trap Design to get the resonant on 17m..now ready to hunting on 17m..hi hi..hope to see you soon at 17m band..
Coaxial Trap Design software
RF Choke 1:1 'ugly balun'
View inside Trap
Traps
Overall
RF Choke 1:1 'ugly balun' in action
Dipole on the air
lovely
Tribander Trap DipoleFormula Calculations as follow :
A = 72 / Mhz (72/18.150 = 3.96m)
B = 72 / Mhz x 0.83 (72 / 7.100 x 0.83 = 8.41m)
C = B - A (8.41 - 3.96 = 4.45m)
Trap Design = 5turns RG58 on 40mm dia. pvc pipe
VSWR on 7.043mhz = 1:1, 7.130mhz = 1.2:1
73/88 de 9M2ODY
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