Sunspots and HF propagation

VAQP QSO Percentages

QSO data from a state QSO party reveal trends in HF usage correlating with sunspot numbers.

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.

NVIS Gain of Loop and Dipole vs. Height

Observations from the Virginia QSO Party confirm simulation results concerning horizontal antennas and NVIS propagation.

40m Mastless NVIS Antenna

40m Mastless NVIS Antenna

Yet another 40m Cloud Burner design featuring a folded dipole driven element plus one reflector wire to facilitate 40m NVIS contacts without need of a tall mast. The design uses electric fence posts for support and needs no balun.

NVIS 80m with 160m Full Wave Loop is less than ideal

Big HF loop antennas provide great performance, but they can’t do everything. 160 meter full wave loops won’t work well for NVIS when used at 3.8 MHz.

75 Meter Turnstile Antenna

Can a turnstile antenna work for 75 meters?