KX4O SDR Receiving Electronics
With a bit of work, one can successfully feed an array of LF-HF receivers from one broadband antenna.
HF
Wolf River Coils – Silver Bullet vs. Silver Bullet Platinum 1000
We examine the differences between the original and higher power version of Wolf River Coils’ Silver Bullet 1000 tunable loading coils.
NVIS works very well… except when it doesn’t
Near Vertical Incident Skywave (NVIS) propagation works wonders when the bands cooperate, but can slam the door shut at any moment.
Sunspots and HF propagation
QSO data from a state QSO party reveal trends in HF usage correlating with sunspot numbers.
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.
Small Loop HF Antenna
With components from a variety of vendors, custom machining and a bit of trial and error, another variant of a small loop HF antenna is born.