The XR2206 and 2211 chips are modulator/demodulator chips... I used them to build a RTTY TU for my Radio Shack Color Computer back in '83 or so.
My guess would be some sort of modem. George, KA3HSW -----Original Message----- >From: "Steve S. Bosshard (NU5D)" <[EMAIL PROTECTED]> >Sent: Feb 5, 2008 11:12 AM >To: [email protected] >Subject: Re: [Repeater-Builder] Unknown board > >Seems like the chips are switched capacitance audio filters - similar >used in packet tone encoder / decoder. Don't have a clue. Steve > > >jeffcarlyle wrote: >> Hi all, I posted 4 pics in the photo section of a board I got in a lot >> >
