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40m OCF Spiral Dipole


40m OCF Spiral Dipole

This antenna is an off-center fed spiral dipole for 40 meters, based on KN9B’s spiral dipole

post 23 Jul 2024


Spiral antenna Links

9



Petlowany Antenna Experiment
It is essentially a very short dipole with spiral-wound coils at each end

Spiral antenna for RTLSDR
A Vivaldi antenna is wideband and directional and the design works well for frequencies above 800 MHz


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