jbn@glacier.STANFORD.EDU (John B. Nagle) (06/21/88)
I'd like to transmit 9600 baud, simplex, (one-way) over a good-quality
audio channel that can handle at least 10KHz. The transmit end must be
small and consume modest power; this is a telemetry application. Telephone
oriented modems assume a much narrower audio bandwidth (about 3-4KHz) and
thus must use very elaborate techniques to cram 9600 baud into that narrow
a bandwidth. I'm looking for something simpler, with about 1 baud/Hz
channel utilization. This should be about as complex as a 2400 baud modem,
for which there exist single-chip versions such as the Fairchild
F2224. But that chip can't be turned up to 9600 baud, as far as I know.
Any better ideas?
The guys who want to push more bits through VHF FM repeaters might
have some ideas on this.
John Naglebill@videovax.Tek.COM (William K. McFadden) (06/25/88)
In article <17506@glacier.STANFORD.EDU> jbn@glacier.STANFORD.EDU (John B. Nagle) writes: > I'd like to transmit 9600 baud, simplex, (one-way) over a good-quality >audio channel that can handle at least 10KHz. I posted a reply to this in comp.dcom.modems if anyone is interested. -- Bill McFadden Tektronix, Inc. P.O. Box 500 MS 58-639 Beaverton, OR 97077 UUCP: bill@videovax.Tek.COM, {hplabs,uw-beaver,decvax}!tektronix!videovax!bill GTE: (503) 627-6920 "How can I prove I am not crazy to people who are?"