Transceiver Board; Figure 3-1. Xts 5000 Overall Block Diagram; Figure 3-2. Transceiver (Vhf) Block Diagram (Power And Control Omitted) - Motorola ASTRO XTS 5000 Detailed Service Manual

3-2
3.1

Transceiver Board

The transceiver (XCVR) board performs the transmitter and receiver functions necessary to translate
between voice and data from the VOCON board and the modulated radio-frequency (RF) carrier at
the antenna. The transceiver board contains all the radio's RF circuits for the following major
components:
• Receiver
• Transmitter
• Frequency Generation Unit (FGU)
Figure 3-2 illustrates the VHF transceiver board block diagram while
illustrates the transceiver UHF Range 1 and 700–800 MHz transceiver block diagrams.
Reference
Oscillator
EPIC
Y200
3
TX_SSI from
VOCON Board
DAC LPF
U203 FL200
Serial EE
PROM
U4
3
RX_SSI to
VOCON Board
Sample
Clk

Figure 3-2. Transceiver (VHF) Block Diagram (Power and Control Omitted)

November 16, 2006

Figure 3-1. XTS 5000 Overall Block Diagram

VCOBIC
U202
Loop
VCO
Filter
FracN
U203
VCO
MOD
IN
ABACUS III U500
Crystal
Filter
FL403
2ND
LO
Theory of Operation: Transceiver Board
Figure 3-3 on page 3-3
TX TX Driver
Power
Buffer Amplifier
Module
Q304 U102
Directional
Coupler
U101
RF Power
Detector
D103
PCIC
U104
Preselector RX LNA Preselector
Mixer
Filter Q401 Filter
U401
FL401 FL402
Antenna
Switch
To
Antenna
Harmonic
Filter
MAEPF-27529-O
6881094C31-E