General Information
The Continuous Tone Coded Squelch System (CTCSS) was developed for use with analog voice radios. Analog radios equipped with the CTCSS system transmit a tone simultaneously with the voice signal. CTCSS radios enable the selection of particular radio units by recognition of the CTCSS tones. CTCSS tones are standardized by the EIA/TIA, but some systems use non-standard tones
Usage:
§ Analog voice radio with station selection.
Mode Details
|
|
Item |
Value |
|
Standard |
Modulation |
Multi-tone |
|
|
Number of tones |
38 |
|
Demodulator Settings |
Demodulator |
Voice |
|
|
Voice mode |
F3E |
|
|
SELCAL type |
CTCSS |
|
|
Sensitivity |
Middle |
|
Features |
Demodulation |
yes |
|
|
Recognition |
yes |
|
|
Decoding |
yes |
|
|
Automatic Polarity Adjustment |
no |
|
|
Combination with other modems (modem list) |
yes |
|
Tuning |
The tuning frequency is 240 Hz below the center peak | |
Table 5: CTCSS
Figure 5: CTCSS Spectrogram