> All that is need for communications grade AM is 300Hz to 3KHz audio. Just > use a 6db/octave rolloff at 3KHz. > > There is not much 3KHz or higher energy in the human voice.And we are not > supposed to be playing music. > > Bob Macklin > K5MYJ
There is nothing in the rules that says we have to use "communications grade" audio (the space shuttle sound) on the ham bands. Besides, there IS intelligibility information contained in frequencies above 3 kHz. The frequency range between 3 and 5 kHz contains most of the articulation, or sibilance sounds that make consonants clearly distinguishable from each other. With space shuttle audio, some of this information is lost, and the human brain subconsciously attempts to fill in the missing pieces, so the casual listener may not be aware of what is missing but the message doesn't get through 100%. That explains why SSB operators tend to use phonetics so often. This also causes listener fatigue after a short while. Don k4kyv _______________________________________________________________ This message was typed using the DVORAK keyboard layout. http://www.mwbrooks.com/dvorak/ http://gigliwood.com/abcd/ ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
