AUDIO/DATA SECTION. Continued
Figure 2-5. Audio/Data Section Module Locations
This section includes the COMSEC interface circuitry. All signals passing between the audio/data section and the
rest of the RT are filtered or buffered by the audio power supply. These signals inside the audio/data section are
called RED signals to avoid confusion. The audio power supply also adds the 150-Hz squelch tone to the audio or
data signal to be transmitted.
audio control module performs the following functions:
Generation of audio/data section control signals.
Routing of data signals to the data rate adapter.
Plain text/cipher text (PT/CT) signal routing.
Control of the push-to-talk line inside the audio/data section.
audio/data I/O module controls signal routing within the audio/data section. It also contains the microphone
audio output amplifiers.
data rate adapter performs the following functions:
Interleaves and deinterleaves low speed data into the 16 kb/s data rate of the RT.
Provides error correction at low speed data rates.
Adds a synchronization preamble to the start of data transmissions to identify the type of data being
Inserts and removes transitions in plain text data modes.
Generates low speed data clocks and synchronizes local clocks.