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32 Functional Description TB7100 Service Manual

3.4 System Interface Operation

This section describes the functioning of the system interface. The system

interface provides:

■ internal power distribution

■ serial data connection (THSD or FFSK)

■ fan control

■ general purpose IO

■ receiver audio processing

■ transmitter audio processing

■ opto-isolated keying

■ relay output

■ received signal strength indication (RSSI)

■ receiver gate output

■ receiver inhibit input

■ 13.8V DC (1.5A) output

■ tone on idle (TOI).

These functional parts are described in detail below.

Tait TB7100 Service Manual

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