I forgot!!!
You have to invert the angle of the parasitic elements to get RHCP. The way you have model them is for LHCP.
Apostolos SV1LJJ
On Fri, 2019-11-22 at 19:45 -0500, Roy Dean via AMSAT-BB wrote:
Is anybody on this list a power (or even casual) user of nec2? I've been tinkering with xnec2c, and am attempting to model AA4TX's parasitic lindy antenna (70cm) as a check (Tony provided gain plots in his paper).
However when I plot gain, all I get is the standard donut pattern (vert polarization), and sort of modified donut when viewing RHCP.
.nec file is below (apologies for formatting). Thanks in advance to anybody that can offer insight. The learning curve for this software is steep. (not sure if Steve Conklin is on this list - but the below nec data was built off of his 2m satellite yagi model)
--Roy K3RLD
CM AA4TX 70cm parasitic lindy antenna design CE End Comments GW 1 25 0.00000E+00 0.00000E+00 -1.57000E-01 0.00000E+00 0.00000E+00 1.57000E-01 1.90500E-02 GW 2 25 -1.29000E-01 1.03000E-01 7.50000E-02 1.29000E-01 1.03000E-01 -7.50000E-02 3.25000E-03 GW 3 25 1.03000E-01 1.29000E-01 7.50000E-02 1.03000E-01 -1.29000E-01 -7.50000E-02 3.25000E-03 GW 4 25 1.29000E-01 -1.03000E-01 7.50000E-02 -1.29000E-01 -1.03000E-01 -7.50000E-02 3.25000E-03 GW 5 25 -1.03000E-01 -1.29000E-01 7.50000E-02 -1.03000E-01 1.29000E-01 -7.50000E-02 3.25000E-03 GM 0 0 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 GE 0 0 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 FR 0 20 0 0 4.36500E+02 1.00000E-01 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 EX 0 1 13 0 1.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 RP 0 99 99 1000 0.00000E+00 0.00000E+00 5.00000E+00 5.00000E+00 0.00000E+00 0.00000E+00 EN 0 0 0 0 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb