TM8100 Mobile Radio Service Manual General Description 51
May 2004 © Tait Electronics Limited
2.2 Architecture of Radio
Introduction In this subsection the architecture of the radio is described. The different
circuit modules of the control-head, main and digital boards introduced
in Subsection 2.1 (on page 33) are identified and their essential functions
are summarised. The optional circuit boards mentioned in
Subsection 2.1 are covered in other manuals.
Control Head The control heads with UI house a control-head board with the circuitry
needed for the controls and indicators on the front panel. There is
provision for an optional circuit board for use with dynamic
microphones or with a concealed microphone inside the control head.
There is also provision for the fitting of an optional third-party circuit
board in the blank control head.
Circuit Boards in
Control Head
The operation of the control-head board is summarised in
Subsection 2.3 (on page 53). The circuit board for concealed and
dynamic microphones is described in the accessories manual. The fitting
of third-party circuit boards in the blank control head is discussed in the
application manual for 3DK hardware developers.
Radio Body The radio body houses a main board with the transmitter, receiver and
associated circuitry, and a digital board with the microprocessor and
associated circuitry. The digital board is reflow-soldered to the main
board. There is also provision for an internal options board to be
connected to the main board.
Circuit Boards and
Modules in Radio Body
The different circuit modules of the main board are discussed below and
the operation of the circuitry is described in Subsection 2.4 (on page 54)
and Subsection 2.5 (on page 57). The different internal options boards
are discussed in the accessories manual and the 3DK manuals.
Modules of Main Board The control-head, main and digital boards, and the connectors on the
boards, are illustrated in Figure 1.6 of the previous section. Figure 2.13
is a block diagram showing the main and digital boards and the circuit
modules of the main board. These modules are:
■ transmitter
■ receiver
■ frequency synthesizer
■ CODEC (coder-decoder) and audio circuitry
■ power supply
■ interface circuitry
Software plays a prominent role in the functioning of the radio. For
describing the operation of the radio the software must be included with
the above modules. This is considered further below.
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