What makes Digital Coded Squelch work?

• A. Noise.
• B. Tones.
• C. Absence of noise.
• D. Digital codes.

Answer: (D)

Digital coded squelch works by using a unique digital code that is embedded in the transmitted signal and checked by the receiver. The radio’s squelch circuitry decodes the incoming data and compares it to the code that is programmed into that receiver. If the codes match, the squelch opens and the audio passes through; if they don’t match, the squelch stays closed and you don’t hear the transmission. This code-based access allows many different codes on the same channel, so multiple users can share a narrow channel without stepping on each other, and it tends to be more resistant to interference than systems that rely on a single tone. Unlike tone-based squelch, which depends on a specific audible tone, digital codes are hidden in the data and do not produce an audible tone themselves, providing quieting that’s determined by code matching rather than noise level alone.