Well, I know for a fact that AM quality audio can be had on SSB within a 3Khz bandwidth. We are using analog equipment on a microwave link that uses SSB for voice and data. There is not one hint that gives it away as SSB. Stable oscillators, and good mixers seem to be the key. Each 3Khz channel, starting at 0 to 3Khz with a 1Khz guard band, are arranged in groups and supergroups filling a block up to 4 Mhz, giving almost 1000 voice and data, full duplex channels. The circuit board, about the size of 2 QSL cards, is a complete, USB or LSB XCVR, tunable (via dip switch) from 0 to 4 Mhz. The combining of all the different signals is down the line, but is nothing more than hooking all these signals together in a manner that maintains the 75 Ohm Z, nothing else. It is not a modern surface mount miracle either, it is all transistors and IC's, 30 year old technology. Given the quality audio this thing generates, and its size, leads me to conclude that SSB audio in Amateur equipment is by cost and not quality.
Charlie W4MEC in NC (TX1, SB10, RX1, R390A, C Line) ____________________________________________________________________________________ Now that's room service! Choose from over 150,000 hotels in 45,000 destinations on Yahoo! Travel to find your fit. http://farechase.yahoo.com/promo-generic-14795097 ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
