Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: Notesfiles $Revision: 1.6.2.17 $; site trsvax.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!inuxc!pur-ee!uiucdcs!trsvax!mikey From: mikey@trsvax.UUCP Newsgroups: net.ham-radio Subject: Re: RTTY interface, and Packet informati Message-ID: <52800043@trsvax.UUCP> Date: Fri, 4-Jan-85 17:03:00 EST Article-I.D.: trsvax.52800043 Posted: Fri Jan 4 17:03:00 1985 Date-Received: Wed, 9-Jan-85 03:36:42 EST References: <606@asgb.UUCP> Lines: 22 Nf-ID: #R:asgb:-60600:trsvax:52800043:000:958 Nf-From: trsvax!mikey Jan 4 16:03:00 1985 Why buy an interface? You can build one for less than $50, and that includes the box, cables, and power supply. Using the Exar chips, a basic RTTY interface can be built with just two additional chips, a 1488 and a 1489. If you get ingenious, you can even get rid of these. The only other chip you might want is a driver for TX function. This makes a total of 5 chips, plus passive parts. Chip cost is under $12. If you're like me, the board will lay out exposed for a long time till you finally box it. The only difficult part is all the gottcha's on the RS-232. Things like will your RS-232 transmit without CD? How hard is it to use DTR to trigger your transmitter? This kind of stuff. If you build it in a box with switches, you can just hardwire a forced CD and CTS and use a dumb terminal package to transmit and receive. Hardware is the easy part, just tedious. The software can be as complex as you want it to be. mikey at trsvax