Adj For Freo While Counting

Fig. 1-3, Schematic diagram shows basic circuit as used in a continuous-ione-squelch repeater access system. Parts values shown are not applicable to single-tone encoder applications (see text).

Figure 1-3 is the schematic diagram for the unit, which is essentially a phase-shift oscillator coupled into an emitter follower. Since the power consumption of the oscillator circuit is so low, a standard 9V transistor-radio battery will provide an ideal power source. At full output, the oscillator draws no more than about 3 mA.

Tabte L Parts Lists for CTS and Single- Tone Systems

Component

87—112 Hz range

1750 Hz

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