Continuous Tone-Coded Squelch System (CTCSS)

From Signal Identification Wiki
Jump to: navigation, search
Continuous Tone-Coded Squelch System (CTCSS)
CTCSS vce.jpg
Frequencies 30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
,800 MHzMegaHertz (MHz) 10^6 Hz800,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
800,000 kHzKiloHertz (kHz) 10^3 Hz
30,000 kHzKiloHertz (kHz) 10^3 Hz
30 MHzMegaHertz (MHz) 10^6 Hz
800,000 kHzKiloHertz (kHz) 10^3 Hz
800 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
- 800 MHzMegaHertz (MHz) 10^6 Hz800,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
800,000 kHzKiloHertz (kHz) 10^3 Hz
Mode NFMNarrowband Frequency Modulation
Modulation CWContinuous Wave
ACF
Bandwidth 5000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).kHzKiloHertz (kHz) 10^3 Hz
0.005 MHzMegaHertz (MHz) 10^6 Hz
,12500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).12.5 kHzKiloHertz (kHz) 10^3 Hz
0.0125 MHzMegaHertz (MHz) 10^6 Hz
,30000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).30 kHzKiloHertz (kHz) 10^3 Hz
0.03 MHzMegaHertz (MHz) 10^6 Hz
kHzKiloHertz (kHz) 10^3 Hz
0.005 MHzMegaHertz (MHz) 10^6 Hz
30 kHzKiloHertz (kHz) 10^3 Hz
0.03 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description CTCSS, also known as Private Line and Channel Guard, is a low continuous tone transmitted on NFMNarrowband Frequency Modulation voice transmissions that is used to squelch and manage transmissions on a given frequency.
I/Q Raw Recording Download file
Audio Sample
Continuous Tone-Coded Squelch System (CTCSS) is a low continuous tone transmitted on NFMNarrowband Frequency Modulation voice transmissions that is used to squelch and manage transmissions on a given frequency. This is also known as Private Line® (PL) by Motorola, Channel Guard® (CG) by General Electric and generically as tone squelch. The CTCSS system sounds like a low hum to listeners.

CTCSS is used in many analog FMFrequency Modulation public safety radios. They have a characteristic look on the waterfall, as continuous lines emanating around the center frequency carrier.

Decoding Table[edit]

Table of tones, source from RadioScanner.com.

CTCSS table.png

Note: 150.0 is the standard tone used by military radios in the 30-88 MHzMegaHertz (MHz) 10^6 Hz band.

Mode Samples[edit]

151.4 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). CTCSS 173.8 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). CTCSS 186.2 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). CTCSS
151.4Hz ctcss.jpg
173.8Hz ctcss.jpg
CTCSS 186.2.png

CTCSS Full Range
CTCSS.jpg

Video Examples[edit]


Additional Links[edit]

Additional Images[edit]