Intercom working principle signaling processing

- Jan 26, 2018 -


CPU generates CTCSS / CDCSS signal after amplification adjustment, into the voltage-controlled oscillator for modulation. After receiving the low-frequency signal obtained after the frequency discrimination, part of the amplified and sub-audio band-pass filter to filter shaping, into the CPU, compared with the preset value, the results of the control audio amplifier and speaker output. That is, if the same as the preset value, turn on the speaker, if different, turn off the speaker.


  • Motorola Gm380
  • Motorola Cp040
  • Motorola XPR 3000
  • Motorola Dgp 6150
  • Motorola DP4401 EX
  • Motorola DP3601

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