CP card?

What is the application of CP card? I tried a simple two dipole array and
I found no difference in the solutions. I am attaching the two short
nec input files here, can someone point out if there is a mistake there?

file 1 == without CP card ==============================
CM TWO IN_PHASE DIPOLE (in z-axis) ARRAY IN FREE SPACE
CM WITH HALF-WAVELENGTH SPACING (in y-axis)
CM without CP card
CE
GW 1 13 0 -0.25 -0.25 0 -0.25 0.25 0.001
GW 2 13 0 0.25 -0.25 0 0.25 0.25 0.001
GE 0
EX 0 1 7 0 1
EX 0 2 7 0 1
FR 0 1 0 0 300 450
RP 0 361 1 1000 0 90 1 1
RP 0 1 361 1000 90 0 1 1
XQ 0
EN

file 2 == with CP card ==============================
CM TWO IN_PHASE DIPOLE (in z-axis) ARRAY IN FREE SPACE
CM WITH HALF-WAVELENGTH SPACING (in y-axis)
CM with CP card
CE
GW 1 13 0 -0.25 -0.25 0 -0.25 0.25 0.001
GW 2 13 0 0.25 -0.25 0 0.25 0.25 0.001
GE 0
CP 1 7 2 7
EX 0 1 7 0 1
EX 0 2 7 0 1
FR 0 1 0 0 300 450
RP 0 361 1 1000 0 90 1 1
RP 0 1 361 1000 90 0 1 1
XQ 0
EN

Thanks in advance

Yilong Lu
School of EEE,
Nanyang Technological University,
Singapore

eylu_at_ntuvax.ntu.ac.sg
Received on Tue Aug 08 1995 - 16:41:00 EDT