PSKmail, a narrow band ARQ system, allows ham radio operators to send emails and access internet data via short wave HF communication without specialized hardware—just a computer with a sound card. The system uses modes like PSK, MFSK, and THOR, adapting to changing channel conditions for efficient data transfer. Serving as an essential tool for remote or emergency communications, PSKmail can operate in environments lacking internet infrastructure, providing a reliable method of connection with a bandwidth of up to 500 Hz and a net throughput of around 2600 characters per minute. Initiated in 2005, PSKmail supports various platforms and integrates with Linux mail clients, contributing significantly to global amateur radio communications
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