High Performance DTMF Decoder Simplifies Control of Remote Base Stations

Dtmf Remote Control Pic

17020 Snyder Rd., Chagrin Falls, OH 44022 The need for a compact, low power, and maintenance free DTMF decoder resulted in the design described here. It replaced an existing circuit which used several NE-567 decoders and required regular tweaking for satisfactory operation. The primary application was to control various functions of a VHP base station by using OTMF signals received on either the telephone line or an auxiliary receiver. To keep the circuit as small as possible, printed circuit...

Packet Radio With the Tono EXLE Communications Terminal

A complete stand alone VHF HF Packet, AMTOR, RTTY and CW terminal is accomplished by combining the Kantronics Packet TNC with the Tono EXL-5000E communications terminal. How is this done Steps one through nine can explain 1 Wire the RS-232-C cable supplied with the Kantronics unit as follows Brown and white wires should be connected to the individual phono-plug tips. Connect the shield and black wire together, then attach this to the previously wired phonoplug shields. The other wires are...