CQ WPX SSB Contest 2026: SZ40A On the Air This Weekend from SZ1A This weekend the microphones at SZ1A will once again come alive as the CQ World Wide WPX SSB Contest returns and thousands […]

HF Propagation and the Grey Line The grey line is the transition zone between daylight and darkness and is associated with particularly favorable propagation conditions in the high frequency (HF) spectrum (1.8–30 MHz). This article […]