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From HamWiki

QRP

QRP is operating with low transmitter power, usually 5 watts output or less on CW and data modes, or 10 watts PEP on single sideband. The name comes from the Q-code for "reduce your power". That is a twentieth of what a typical 100-watt transceiver puts out, yet QRP stations work every continent, helped by efficient antennas, CW and digital modes such as FT8. Hams take it up for the challenge, for small, light radios and kits, and as the natural partner of portable operating. Read more…