cobra.nec

zip contains tool for Antenna Modelling with examples

CM Centre Fed Linear Loaded Dipole (Cobra Junior) by VK1OD
CM
CM The Cobra antenna is a linear loaded dipole described by Ray Cook (W4JOH)
CM in 73 magazine (June 1997), and gets its name from the "S" configuration
CM of the radiator conductors. Two versions were described, this article looks
CM at the Cobra Junior which is  22.25m (72') overall, and promoted as an all
CM band antenna from 3.5MHz to 30 MHz.
CM
CM Doubled the number of segments because of length/radius violation (arie).
CE

SY freq=3.5

GW 1 61 0 -11.125 10 0 11.125 10 0.001
GW 2  1 0 -11.125 10 0 -11.125 10.1 0.001
GW 3 29 0 -11.125 10.1 0 -0.05 10.1 0.001
GW 4  1 0 -0.05 10.1 0 -0.05 10.2 0.001
GW 5 29 0 -0.05 10.2 0 -11.125 10.2 0.001
GW 6  1 0 11.125 10 0 11.125 10.1 0.001
GW 7 29 0 11.125 10.1 0 0.05 10.1 0.001
GW 8  1 0 0.05 10.1 0 0.05 10.2 0.001
GW 9 29 0 0.05 10.2 0 11.125 10.2 0.001
GE 0
EK
LD 5 0 0 0 5.8E+07
FR 0 1 0 0 freq 1
GN 2 0 0 0 13. 50.000E-03
EX 0 1 31 0 1.
XQ
EN