Talk:Professional Mobile Radio

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[edit] say why subaudible tones subaudible

Mention more about subaudible tones. The UNIX beep(1) man page says middle C octave starts at 261.6 Hz, and I can do "beep -f 111" and can't our ears hear from 20-20000 Hz when young at least. --User:Jidanni 2006-11-16

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