From: utzoo!decvax!harpo!ihnp4!ihuxf!gauldin
Newsgroups: net.micro
Title: Phase Shift Keying Chips?
Article-I.D.: ihuxf.215
Posted: Thu Feb 17 15:32:19 1983
Received: Tue Feb 22 07:19:26 1983
Reply-To: gauldin@ihuxf.UUCP (Mark Gauldin)

I'd like to build a modem to use with my home computer (I'm very
cheap) and I need some information. Low speed modems (300 baud) use
FSK (Frequency Shift Keying) and there are plenty of chips around
that will do the frequency shift modulation/demodulation. In fact,
there are "modems on a chip", thus making low speed modem design a
snap. Unfortunately, I want to build a 1200 baud modem, and the
Bell 212 standard uses Phase Shift modulation. Are there chips
available to do PSK mod/demod? At what price? Does anyone have any
design tips (or actual designs - I'm not proud)? Any info will be
appreciated.

Please reply to me. I'll post a summary of what I find out to the
net. 

		Mark Gauldin
		ihuxf!gauldin