NEC-LIST: Dipole Arrays

Dear all

I wondered if any of you could help me. I am trying to model a
"Franklin" type array of dipoles like ones I have seen that are
commercially available. It is basically three half wave elements, end
fed from the first, with phasing sections inbetween to get the phase
correct on the next element. I have used transmission lines that are
half a wave length long to get the phasing correct.

When modelling the example below with NEC-2, there is massive beam
tilt (about 50 degrees!), with this increasing as the number of
elements increases. Can any of you see if I am modelling this aerial
wrong, or if the NEC input file is incorrectly describing the
situation.

Any help would be greatly appreciated.

Many Thanks

Robert Green

CM NEC-2 Input File of a Franklin type aerial array
CE
GW 1 11 0.0000 0.0000 0.0000 0.0000 0.0000 0.3569
0.0250
GW 2 11 0.0000 0.0000 0.3600 0.0000 0.0000 0.7169
0.0250
GW 3 11 0.0000 0.0000 0.7200 0.0000 0.0000 1.0769
0.0250
GE 0
TL 1 11 2 1 5.00E+01 0.3569
TL 2 11 3 1 5.00E+01 0.3569
FR 0 1 0 0 4.20E+02 0.00E+00
EX 0 1 1 0 1.00E+00
XQ
PQ
RP 0 120 15 1001 0.00E+00 0.00E+00 3.00E+00 2.40E+01 1.00E+04
EN
Received on Mon Mar 27 2000 - 06:15:26 EST