What term describes the use of a sub-audible tone transmitted along with normal voice audio to open the squelch of a receiver?

What term describes the use of a sub-audible tone transmitted along with normal voice audio to open the squelch of a receiver?

• A. CTCSS
• B. DCS
• C. DMTF
• D. PL tone

Answer: (A)

The term that describes the use of a sub-audible tone transmitted along with normal voice audio to open the squelch of a receiver is CTCSS (Continuous Tone-Coded Squelch System). This system allows for the selective opening of a receiver's squelch circuit by using a specific low-frequency tone that is not audible to the human ear but is detected by the receiver. When the receiver detects the correct CTCSS tone, it allows the audio signal to pass through, enabling the operator to hear the transmission. This method improves communication efficiency by reducing interference from unwanted signals or conversations on the same frequency. CTCSS is commonly used in private repeater systems and simplex communications to maintain a level of privacy and to avoid capturing irrelevant transmissions on shared frequencies. DCS (Digital-Coded Squelch) is similar to CTCSS but uses a digital code instead of an analog tone, providing another means of selective squelch operation. DMTF (Dual-Tone Multi-Frequency) refers to the signaling used in telecommunication for dialing phone numbers, and PL tone (Private Line tone) is another term commonly used to describe CTCSS. However, CTCSS is the more widely recognized term specifically used in the

The term that describes the use of a sub-audible tone transmitted along with normal voice audio to open the squelch of a receiver is CTCSS (Continuous Tone-Coded Squelch System). This system allows for the selective opening of a receiver's squelch circuit by using a specific low-frequency tone that is not audible to the human ear but is detected by the receiver. When the receiver detects the correct CTCSS tone, it allows the audio signal to pass through, enabling the operator to hear the transmission.

This method improves communication efficiency by reducing interference from unwanted signals or conversations on the same frequency. CTCSS is commonly used in private repeater systems and simplex communications to maintain a level of privacy and to avoid capturing irrelevant transmissions on shared frequencies.

DCS (Digital-Coded Squelch) is similar to CTCSS but uses a digital code instead of an analog tone, providing another means of selective squelch operation. DMTF (Dual-Tone Multi-Frequency) refers to the signaling used in telecommunication for dialing phone numbers, and PL tone (Private Line tone) is another term commonly used to describe CTCSS. However, CTCSS is the more widely recognized term specifically used in the