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5

On VHF/UHF, just ask, "This is [your call sign], is this frequency in use?" If you don't hear anything after five seconds or so, go ahead and use the frequency. On HF, things are more complicated, because there might be a QSO happening on the frequency, but you might be unable to hear one or both sides of the conversation. In a non-contest ...


0

CQ is a general call. Something like 'anyone wants to establish contact with me?' QRZ means 'I think someone answered (or called me), but I couldn't really get the callsign. Please repeat your call' It is meant mainly after a CQ and not understanding the reply. In contests, where communications tend to be somewhat chaotic, QRZ is sometimes used instead CQ ...


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