KX4O SDR Receiving Electronics
With a bit of work, one can successfully feed an array of LF-HF receivers from one broadband antenna.
MF
Airspy YouLoop LF/MF/HF Möbius Receive Antenna
The Airspy YouLoop is a no tune, broadband, small footprint, affordable LF to HF receive antenna that works indoors. Its modular construction facilitates experiments to understand where the Möbius inspired electrical design provides benefit.
Anatomy of a low frequency aviation radio beacon
Aviation LF/MF beacons provide the opportunity to admire electrically-small antenna design on a macroscopic scale.
The need for 9600 bps AX.25
Despite its age AX.25 can compete with the slick newer digital technologies. Let’s see where packet fits into the digital landscape.