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Chapter 8. - DTMF
DTMF is an in-band signaling method using dual tone signals for any given code. Originally
developed for telephony systems, it has proved a very versatile tool in many other areas.
In two-way radio systems, DTMF is most commonly used for automation systems and remote
control. A common example would be in amateur radio repeaters where some repeaters are
activated by sending out a DTMF sequence (usually a simple single-digit sequence).
Table 8.1. DTMF frequencies and corresponding codes
The BTECH GMRS-V2 has a full implementation of DTMF, including the A, B, C and D codes.
The numerical keys, as well as the , and , keys correspond to the matching DTMF codes as
you would expect. The A, B, C and D codes are located in the , , and keys
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