The entire call number is transmitted by consecutive tones in decade sequence. When two identical digits are to be transmitted consecutively, then an eleventh frequency is used as a repetition identifier. If more than two identical digits are to be transmitted, the repetition tone is appended to the digit tone (e.g., 22222 is transmitted as f2 fw f2 fw f2, where f2 is the tone for "2" and fw is the repetition tone).

In most systems the accuracy of the single frequencies has to be within +1/-1.5% of the nominal value.

Decoding the selective calls is started by clicking on a system. If transmission and system selection conform, the call sign is displayed on the monitor. In the Options menu a Time stamp function can be enabled to add date and time to each call.

Tone Allocation

Tone duration: 100ms.