Brian Lloyd wrote:
Yes, we are talking about the same thing. They take the voice and
digitize it and then put the data stream into multiple PSK carriers that
fill up the entire voice bandwidth (2.7KHz).
Ever see a digital TV signal on a spectrum analyzer? A UHF FM group I
belong to has a site at Meadow Lakes, CA ... the "Mt. Wilson of Fresno."
On the scope, a DTV signal is a rectangle, 6 Mhz wide, and constant
envelope. I suspect digital voice is pretty much the same only the
rectangle is 2.5Khz wide.
73,
Fred K6DGW
- Northern California Contest Club
- CU in the 2007 CQP Oct 6-7
- www.cqp.org
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