RTTY converter - radio teletype — a fascinating hobby for short wave listeners who own a computer

7-70 - elektor july/august 1982 RTTY stands for radio teletype, during which data is transferred in various codes, one of the most im- portant being the Baudot code. For the reception of teletype messages transmitted in the Baudot format a RTTY converter is needed, such as the one described here. The RTTY converter only contains a single IC, the TL 084, and a few external com- ponents. The IC incorporates a set of four opamps, around which the filters and limiter stages are con- structed. Figure 1 shows what the receiver chain of a Baudot RTTY printer usually looks like. The converter constitutes the "life-line" between the receiver and the teletype printer. It serves to convert signals picked up by the receiver into digital output data. Readers who do not own a Baudot teletype printer but a computer with a video interface can receive and convert RTTY signals in the manner shown in figure 2. In ad- dition to the RTTY converter, a Baudot ASCII converter (in the form of the Junior...