In this article, Elizabeth Klinc, KE8FMJ introduces the basics of HAM radio, focusing on the WSPR protocol designed for weak-signal radio communication. Developed by Nobel Prize winner Joe Taylor, K1JT, WSPR allows users to test propagation paths by sending and receiving low-power transmissions. The protocol is efficient, utilizing strong forward error correction and narrow-band frequency-shift-keying to fit multiple signals into a small bandwidth. Users only need a radio and computer with internet connection to participate in WSPR, with the option to listen and report signals without transmitting. The protocol continues to evolve, improving decoder sensitivity and handling crowded sub-bands.
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