Here is a NEC2 card stack for the helix. The gain is about 12 dBi.
CM Helix, SatNOGS, v4
CM Frequency: 434 MHz
CM Wavelength: 691 mm
CM c=299792458 m/s
CM Radius = 110 mm
CM Turns: 8
CM Circumference to wavelength ratio: 1
CM Reflector perimeter to wavelength ratio: 0.8 = 553 mm
CM Winding diameter: 220mm
CM Winding circumference: 691mm
CM Winding spacing: 172 mm
CM WInding length: 5696 mm
CM Reflector perimeter: 553mm
CM Total length = 172 mm x 8 t = 1376 mm
CM
CM Feedpoint(1) - Z: (110.310 - i 1156.800) I: (0.0001 + i 0.0009) VSWR(Zo=50 Ω): 99$
CM Directivity: 11.07 dB
CM Max gain: 12.70 dBi (azimuth 0 deg., elevation 90 deg.)
CM Front-to-back ratio: 0.00 dB (elevation 90 deg)
CM Front-to-back ratio: 0.00 dB (elevation of front lobe)
CM Front-to-rear ratio: 0.00 dB
CE
GH 1 500 0.172 1.376 0.110 0.110 0.110 0.110 0.003
SM 10 10 0.277 -0.277 0 0.277 0.277 0
SC 0 0 -0.277 0.277 0
GE
EX 0 1 1 0 1 0 0 0 0 0 0
FR 0 1 0 0 434 0
RP 0 90 90 0 0 0 1 4 0 0 0
EN
Here is a NEC2 card stack for the 8 turn helix. It computes about 12 dBi gain.
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Here is a NEC2 card stack for the helix. The gain is about 12 dBi.
CM Helix, SatNOGS, v4
CM Frequency: 434 MHz
CM Wavelength: 691 mm
CM c=299792458 m/s
CM Radius = 110 mm
CM Turns: 8
CM Circumference to wavelength ratio: 1
CM Reflector perimeter to wavelength ratio: 0.8 = 553 mm
CM Winding diameter: 220mm
CM Winding circumference: 691mm
CM Winding spacing: 172 mm
CM WInding length: 5696 mm
CM Reflector perimeter: 553mm
CM Total length = 172 mm x 8 t = 1376 mm
CM
CM Feedpoint(1) - Z: (110.310 - i 1156.800) I: (0.0001 + i 0.0009) VSWR(Zo=50 Ω): 99$
CM Directivity: 11.07 dB
CM Max gain: 12.70 dBi (azimuth 0 deg., elevation 90 deg.)
CM Front-to-back ratio: 0.00 dB (elevation 90 deg)
CM Front-to-back ratio: 0.00 dB (elevation of front lobe)
CM Front-to-rear ratio: 0.00 dB
CE
GH 1 500 0.172 1.376 0.110 0.110 0.110 0.110 0.003
SM 10 10 0.277 -0.277 0 0.277 0.277 0
SC 0 0 -0.277 0.277 0
GE
EX 0 1 1 0 1 0 0 0 0 0 0
FR 0 1 0 0 434 0
RP 0 90 90 0 0 0 1 4 0 0 0
EN
Here is a NEC2 card stack for the 8 turn helix. It computes about 12 dBi gain.
CM Helix, SatNOGS, v4
CM Frequency: 434 MHz
CM Wavelength: 691 mm
CM c=299792458 m/s
CM Radius = 110 mm
CM Turns: 8
CM Circumference to wavelength ratio: 1
CM Reflector perimeter to wavelength ratio: 0.8 = 553 mm
CM Winding diameter: 220mm
CM Winding circumference: 691mm
CM Winding spacing: 172 mm
CM WInding length: 5696 mm
CM Reflector perimeter: 553mm
CM Total length = 172 mm x 8 t = 1376 mm
CM
CM Feedpoint(1) - Z: (110.310 - i 1156.800) I: (0.0001 + i 0.0009) VSWR(Zo=50 Ω): 99$
CM Directivity: 11.07 dB
CM Max gain: 12.70 dBi (azimuth 0 deg., elevation 90 deg.)
CE
GH 1 500 0.172 1.376 0.110 0.110 0.110 0.110 0.003
SM 10 10 0.277 -0.277 0 0.277 0.277 0
SC 0 0 -0.277 0.277 0
GE
EX 0 1 1 0 1 0 0 0 0 0 0
FR 0 1 0 0 434 0
RP 0 90 90 0 0 0 1 4 0 0 0
EN