ve4mafeed.nec

zip contains tool for Antenna Modelling with examples

' The VE4MA feed is a coffee-can feed with a choke ring added
CM Dish-Feed VE4MA.NEC
CM Horn 300mm long, shorted end 176mm diameter
CM at 'mouth' cylinder 120mm long, 420mm diameter
CM horn flush with choke ring
CM by PA3AEF, modified by W1GHZ
CM smaller patches 11/98
CE **********************************************
SP 0 3 .210 -0.03326 .300 .210 0.03326 .300
' Choke ring starts here, 210 mm radius
SC 0 3 .210 0.03326 .277 .210 -0.03326 .277
SC 0 3 .210 0.03326 .254 .210 -0.03326 .254
SC 0 3 .210 0.03326 .231 .210 -0.03326 .231
SC 0 3 .210 0.03326 .208 .210 -0.03326 .208
SC 0 3 .210 0.03326 .180 .210 -0.03326 .180
' Surface patches turn corner for closed end of choke ring
SC 0 3 .170 0.02693 .180 .170 -0.02693 .180
SC 0 3 .130 0.02059 .180 .130 -0.02059 .180
' Down to same radius as waveguide to make connection
SC 0 3 .088 0.01394 .180 .088 -0.01394 .180
' Rest of file is identical to COFFEE.NEC
SP 0 3 .088 -.01394 .300 .088 0.01394 .300
SC 0 3 .088 0.01394 .277 .088 -.01394 .277
SC 0 3 .088 0.01394 .254 .088 -.01394 .254
SC 0 3 .088 0.01394 .231 .088 -.01394 .231
SC 0 3 .088 0.01394 .208 .088 -.01394 .208
SC 0 3 .088 0.01394 .185 .088 -.01394 .185
SC 0 3 .088 0.01394 .162 .088 -.01394 .162
SC 0 3 .088 0.01394 .139 .088 -.01394 .139
SC 0 3 .088 0.01394 .116 .088 -.01394 .116
SC 0 3 .088 0.01394 .093 .088 -.01394 .093
SC 0 3 .088 0.01394 .069 .088 -.01394 .069
SC 0 3 .088 0.01394 .046 .088 -.01394 .046
SC 0 3 .088 0.01394 .023 .088 -.01394 .023
SC 0 3 .088 0.01394 .000 .088 -.01394 .000
SC 0 3 .060 0.00950 .000 .060 -.00950 .000
SC 0 3 .030 0.00475 .000 .030 -.00475 .000
GM 0 4 .000 0.0 18.0
GM 0 0 .000 0.0 9.0
SP 0 0 .015 0.015 .000 90.0 .00000 .0009701
GX 0 110
GW 1 4 .0622 .0622 .100 .0198 .0198 .100 .002
GM 0 0 0.0 0.0 45.0 0 0 -0.300
GE
FR 0 1 0 0 1296.0
EX 0 1 1 0 1.0 0
LD 5 0 0 0 3.72E+07
PT -1
RP 0 37 3 1500 0.0 0.0 10.0 45.0
EN