The Lab 599 Discovery TX-500 reviewed, an introduction to Microwaves, 144MHz contest results, build a signal generator, the HRO receiver, budget HF antennas and lots more.

Measurement, navigation and radio-science are some of the key ‘themes’ of the October issue of RadioUser. We are taking you into the world of frequency-standard and time signal utility stations, via PPE in Brazil, look at some direction-finding technology in history and continue our exploration of the father of ionospheric science, Oliver Heaviside. Additionally, in a specially-written article for this issue, the editor is looking at simple ways to receive, log and analyse weather and climate information with your radios.