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Commonly compared pairs

Interference: QRM is man-made (other stations, electrical equipment); QRN is natural (ligh…

Both prosigns hand off at the end of a transmission. K invites a reply from anyone listeni…

Both prosigns mark an ending, but at different scope. AR closes one message or transmissio…

Opposite instructions for transmitter power. QRO asks for more power; QRP asks for less — …

Opposite instructions for CW sending speed. QRQ asks the other station to send faster; QRS…

Not a contrast — TNX and TKS are two fully interchangeable spellings of “thanks”, listed t…

Not a contrast — 5NN is the CW-only shorthand for the exact same signal report as 599, sub…

The traditional friendly-address pair for a fellow operator: OM (Old Man) for a male opera…