54 Description TM9100 Service Manual
© Tait Electronics Limited August 2005
2.6 Operation in Transmit Mode
Overview This section describes the functioning of the transceiver in transmit mode.
The operation of the transceiver is illustrated in Figure 2.12 on page 48
(analog mode) and Figure 2.13 on page 49 (digital mode).
These block diagrams show the hardware modules integrated with the
software modules:
■ hardware (transmitter, receiver, CODEC and audio)
■ RISC processor (on FPGA of digital board)
■ custom logic (on FPGA of digital board)
■ DSP block (on digital board)
Note The block diagrams for the analog and digital modes only differ in
the operation of the DSP.
The transmit path consists of three major functional parts:
■ audio processing and signaling
■ frequency synthesizer
■ RF transmitter
Note The information flow on a digital radio can be categorized in two
forms, signaling (including user data) and voice. Whilst setting up
a call, signaling may be the only information transferred across the
air interface. Once a call has been established however, both sig-
naling and voice information are transported. The signaling infor-
mation continues throughout the call for the purpose of maintain-
ing the call and possibly sending data information.
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