Lee,
Try the following NEC input file:
CM HG105CA2.ANT
CM Hy-Gain 105CA Low Phone Setting
CM Free Space
CM 28.400 MHz
CM 5 tapered elements converted
CM 46 segments
CE
GW 1 10 -3.6386 -2.6283 0.0000 -3.6386 2.6283 0.0000
.00834224
GW 2 9 -2.1654 -2.4978 0.0000 -2.1654 2.4978 0.0000
.00716392
GW 3 9 -1.0224 -2.4764 0.0000 -1.0224 2.4764 0.0000
.00716838
GW 4 9 1.0986 -2.4326 0.0000 1.0986 2.4326 0.0000
.00721312
GW 5 9 3.6386 -2.3387 0.0000 3.6386 2.3387 0.0000
.00731468
GE 0
PT -1
EX 0 2 5 00 1.0000 0.0000
FR 0 0 0 0 28.400
RP 0 1 91 1000 90.00 0.00 0. -2.
RP 0 91 1 1000 90.00 0.00 -2. 0.
EN
This was created by using Brian Beezley's AN program with the taper option.
The resulting NECIN.TMP file was edited, renamed and submitted to both
NEC81 and NEC-4.1 and compared with the YO results at 28.4. The results
are shown below:
105CA2 NEC81 NEC 4.1 YO v5.0
Impedance 23.4-j15.97 23.4-j15.96 22.4-j12.3
Forward gain 10.42 dBi 10.42 dBi 10.35 dBi
Front/Back 28.25 dB 28.25 dB 24.88 dB
I also have a full tapered file for NEC 4.1 at 28.4 MHz:
Impedance 25.97-j13.52
Forward gain 10.49 dBi
Front/Back 22.72 dB
The full-taper file needs to be tweaked a little more with segmentation
variation for convergence.
73 Roger WB0DGF
Telex Communications, Inc.
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