On Wed, 13 Aug 2008 20:35:05 -0700 (PDT), alsopb wrote:
>Let's assume you don't talk to just one or a few stations over and over >again but instead the random type contacts most of us make. >How are you going to reduce the 12 trillion combos to a few dozen to try >given: You're thinking as a mathematician. I'm an engineer. I deal with the real world and practical solutions, not wild circumstances. >1) You don't know the filter width the station listening to you has. Is it >1.8, 2.1. 2.8, 6 KHz? >2) You don't know the speaker or earphone frequency response of the other >station >3) You don't know the ear frequency response of the listener This is ham radio. It's about communications, not hi-fi. Paraphrasing Riley Hollingsworth, if you want to transmit broadcat audio, buy a radio station. >4) Most hams probably don't know their microphones frequency response That CAN be a known if you're not mentally lazy and you buy REAL mics with real spec sheets, not products with big advertising budgets and cut sheets written by marketing weasels. >5) The propogation and QRM conditions are highly variable Has nothing to do with frequency response. >6) How does compression factor in? Is different from frequency response, but from a communications point of view, it's a good thing. I'm an EE by training and an audio engineer by trade. I'm also a Fellow of the AES. I make my living by doing great audio. But this is ham radio. Excellence is about maximizing communications, which requires good linearity in the speech region and efficient use of the bandwidth. I suggest that you study the tutorials I've prepared on this topic, previously cited. 73, Jim Brown K9YC _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
