Abstract: The multi-frequency multipath observations of temporal variations in the Doppler spectra and signal amplitudes of HF radio waves reflected from the ionosphere, which accompanied ionospheric ...

LIMA, Ohio (WLIO) – If you are Amateur Radio enthusiasts or just curious about the hobby, Hamfest was the place to be Saturday morning. The Northwest Ohio Amateur Radio Club hosted the event to give ...

Abstract: High Frequency (HF) communication systems use radio waves at frequencies in the range of 3-30 MHz propagating in the form of skywave with the help of the ionosphere. For emergency ...

It used to be that a wing wave or rapid tail deflection was all that was needed by the pilot of an aircraft to acknowledge a visual queue from a person on the ground. The evolution of electronic ...

Holger, ZL3IO will be active again as ZL7IO from Chatham Islands, IOTA OC - 038, New Zealand, in CQ WW DX CW Contest, 29 - 30 November 2025.