- by:Al Williams
Morse code qualifies as a digital mode, although organic brains are somewhat better at copying it than electronic ones. Ham radio operators that did “phone” (ham-talk for voice) started out with AM modulation. Sometime after World War II, there was widespread adoption of single side band or SSB. SSB takes up less bandwidth and is more reliable than AM modulation. On the digital side, hams turned to different and more sophisticated digital transmission types with computers pushing bandwidth down and reliability up. However, a recent trend has been to encode voice over ham radio–sort of VoIP with radio instead of Ethernet–using an open source program called freedv…..
Amateur Radio Emergency Service Manual The latest edition (March 2015) of the Amateur Radio Emergency Service® (ARES) Manual now is online. Thi... Read more
New ISS crew members Peggy Whitson, KC5ZTD, Thomas Pesquet, KG5FYG, and Cosmonaut Oleg Novitskiy are settling in on board the International Space Stat... Read more
DESIGN & BUILD A SINGLE-SIDEBAND TRANSCEIVER FROM SCRATCH PART 1 Read Full Article: Read more
Samuel F.B. Morse’s oil painting “Gallery of the Louvre” is packed with works by Rembrandt, Caravaggio and Raphael — a grouping that didn’t actually e... Read more
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