Module tone 

Tone, DCS (Digital-Coded Squelch), and related signaling types for the TH-D75 transceiver.

Contains CTCSS (Continuous Tone-Coded Squelch System) frequency and DCS code lookup tables, along with validated newtype wrappers and signaling mode enums.

Per User Manual Chapter 10:

• CTCSS, Tone, and DCS cannot be active simultaneously on a channel.
• Pressing [TONE] cycles: Tone -> CTCSS (CT) -> DCS -> Cross Tone -> Off. When APRS Voice Alert is configured, Voice Alert ON is added to the cycle.
• CTCSS/DCS settings can be applied independently per VFO, Memory Channel, and Call mode. Changes in Memory/Call mode are temporary unless stored.
• Both CTCSS and DCS support frequency/code scanning ([F] + hold [TONE]) to identify an incoming signal’s tone or code.

See User Manual Chapters 7 and 10 for full CTCSS/DCS/Cross Tone details.

Structs

DcsCode

Validated DCS code (index into DCS_CODES).

ToneCode

Validated tone code (index into CTCSS_FREQUENCIES).

Enums

CtcssMode

CTCSS encode/decode mode (byte 0x09 bits [1:0]).

DataSpeed

Data speed for packet/digital modes.

LockoutMode

Channel lockout mode for scan operations.

ToneMode

Tone signaling mode for a channel.

Constants

CTCSS_FREQUENCIES

CTCSS (Continuous Tone-Coded Squelch System) frequency table.

DCS_CODES

DCS (Digital-Coded Squelch) code table.