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Sophisticated Helix Antenna Design,with matching Coax to 50 Ω

post 08 Jul 2024


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Helix calculator
Sophisticated Helix Antenna Design,with matching Coax to 50 Ω

Illuminate an offset parabola 80 cm
CM Helix, SatNOGS, v4, CM Frequency: 434 MHz, CM Wavelength: 691 mm, CM c=299792458 m/s, CM Radius = 110 mm, CM Turns: 8

MHz Helical Antenna
I decided to build a pair of helical antennas, one for each circular sense. Helical antennas have broad bandwidth, loose construction tolerances, and for 900 MHz, wouldn't be too big

New Helix Antenna Design
Reflector Loop Dia: 10.66" The reflector is positioned 0.375" ahead of the start point of the first helix turn, first 4 Turns: 10.32", Next 7 Turns: 8.68", Last 12 Turns: 8.40


23cm Yagi Antenna building

23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency

50 MHz preamp Gain 26dB with the BFG135

50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection

interface-for-digital-broadcasts-with-integrated-audio

Interface-for-digital-broadcasts-with-integrated-audio 4-port HUB, with a TUSB2046. With port 1 of the HUB we drive the FT232RL; with port 2 the PCM2904, furthermore, we decided to leave ports 3 and 4 free