5/4/2023 0 Comments Baofeng dtmfI used a Baofeng radio with a male 2.5 mm tip, ring, sleeve (TRS) stereo audio plug connected from the radio speaker jack to the input of the MT8870 DTMF Voice Decoder Module. The audible signals can be transmitted to another radio to control an action such as turning on a lightbulb miles away. The signals may be generated on your ham radio by pressing the push to talk (PTT) button and one of the keys on the key pad. The DTMF system uses a set of eight audio frequencies transmitted in pairs to represent 16 signals, with numbers 0 through 9, the letters A to D, and the symbols # and *. Dual Tone Multi Frequency (DTMF) is also known as touch tone.
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