Tait TP9100, Service Manual, Page: 41 / 326

TP9100 Service Manual
Description 41
© Tait Electronics Limited May 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 simplified block diagrams in
■
Figure 2.6 on page 35 (analog mode)
■
Figure 2.7 on page 36 (digital mode)
These block diagrams show the hardware modules integrated with the
software modules:
■
hardware (transmitter, receiver, CODEC and audio)
■
RISC processor (on the FPGA of the digital circuitry)
■
custom logic (on the FPGA of the digital circuitry)
■
DSP (on the digital circuitry)
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.