2014年5月31日土曜日

4NEC2 APT QFH Antenna をモデリングしてみる

4NEC2でART受信用 QFH:Quadirifilar helical Antennaをモデリングしてみた。
配線長が短くなってしまい。中心周波数が137.5MHzが、141.5MHzとなってしました。

APT_QFT_hgh.necの中身=================================

CM APT QFH:QuadriFilar Helix Anttena Model
CM 137.75MHz => 141.5MHz
CM
CM
CM
CM
CM
CE
SY Hgh = 5 'Installation hight
GW 1 6 0 0 0+hgh .187 0 0+hgh .004
GW 2 1 .187 0 0+hgh .161947 -.0935 .093333+hgh .004
GW 3 1 .161947 -.0935 .093333+hgh .0935 -.161947 .186667+hgh .004
GW 4 1 .0935 -.161947 .186667+hgh 0 -.187 .28+hgh .004
GW 5 1 0 -.187 .28+hgh -.0935 -.161947 .373333+hgh .004
GW 6 1 -.0935 -.161947 .373333+hgh -.161947 -.0935 .466667+hgh .004
GW 7 1 -.161947 -.0935 .466667+hgh -.187 0 .56+hgh .004
GW 8 4 -.187 0 .56+hgh -.04 0 .56+hgh .004
GW 11 4 0 0 0+hgh -.187 0 0+hgh .004
GW 12 1 -.187 0 0+hgh -.161947 .0935 .093333+hgh .004
GW 13 1 -.161947 .0935 .093333+hgh -.0935 .161947 .186667+hgh .004
GW 14 1 -.0935 .161947 .186667+hgh 0 .187 .28+hgh .004
GW 15 1 0 .187 .28+hgh .0935 .161947 .373333+hgh .004
GW 16 1 .0935 .161947 .373333+hgh .161947 .0935 .466667+hgh .004
GW 17 1 .161947 .0935 .466667+hgh .187 0 .56+hgh .004
GW 18 4 .187 0 .56+hgh .04 0 .56+hgh .004
GW 21 4 0 0 .024+hgh 0 -.178 .024+hgh .004
GW 22 1 0 -.178 .024+hgh -.089 -.154153 .109333+hgh .004
GW 23 1 -.089 -.154153 .109333+hgh -.154153 -.089 .194667+hgh .004
GW 24 1 -.154153 -.089 .194667+hgh -.178 0 .28+hgh .004
GW 25 1 -.178 0 .28+hgh -.154153 .089 .365333+hgh .004
GW 26 1 -.154153 .089 .365333+hgh -.089 .154153 .450667+hgh .004
GW 27 1 -.089 .154153 .450667+hgh 0 .178 .536+hgh .004
GW 28 4 0 .178 .536+hgh 0 .04 .56+hgh .004
GW 31 4 0 0 .024+hgh 0 .178 .024+hgh .004
GW 32 1 0 .178 .024+hgh .089 .154153 .109333+hgh .004
GW 33 1 .089 .154153 .109333+hgh .154153 .089 .194667+hgh .004
GW 34 1 .154153 .089 .194667+hgh .178 0 .28+hgh .004
GW 35 1 .178 0 .28+hgh .154153 -.089 .365333+hgh .004
GW 36 1 .154153 -.089 .365333+hgh .089 -.154153 .450667+hgh .004
GW 37 1 .089 -.154153 .450667+hgh 0 -.178 .536+hgh .004
GW 38 4 0 -.178 .536+hgh 0 -.04 .56+hgh .004
GW 41 1 .01 -.01 .56+hgh -.01 .01 .56+hgh .004
GW 42 1 .01 -.01 .56+hgh .04 0 .56+hgh .004
GW 43 1 .01 -.01 .56+hgh 0 -.04 .56+hgh .004
GW 44 1 -.01 .01 .56+hgh -.04 0 .56+hgh .004
GW 45 1 -.01 .01 .56+hgh 0 .04 .56+hgh .004
GE 1
LD 5 0 0 0 58000000
GN 2 0 0 0 5 0.001
EK
EX 0 41 1 0 1 0 0
FR 0 0 0 0 141.5 0
EN

=================================





2014年5月26日月曜日

4NEC2 VHF Air Band GP antenna

4NEC2 (NEC based antenna modeler and optimizer)
でVHF AIR-Band GP をやってみました。

















VHF_AB_GP.necの中身 ==========================

CM  VHF Ari Band Ground-plane
CM
CM 
CE
SY Len = 570 mm 'Length of the element
SY RadE = 0.75 mm 'Radius of the elements
SY Ang =  60 'Angle
SY Hgh = 5 'Installation height
SY xy=Len*sin(90-Ang), z= Len* cos(90-Ang)
GW 1 24 0 0 Hgh 0 0 Len+Hgh RadE
GW 2 8 0 0 Hgh xy 0 Hgh-z RadE
GW 3 8 0 0 Hgh 0 -xy Hgh-z RadE
GW 4 8 0 0 Hgh -xy 0 Hgh-z RadE
GW 5 8 0 0 Hgh 0 xy Hgh-z RadE
GE 1
LD 5 0 0 0 15600000
GN 2 0 0 0 4 0.003
EK
EX 0 0 1 0 1. 0 0
FR 0 0 0 0 131 0
EN

===============================================

4nec2 EditのSynbolsタブにて、
エレメントの長さ、半径、アングル、地上高を修正できるようにした。
上は、Ang = 0°
下は、Ang = 60°です。共振周波数、パターンなど変化しています。