Chapter 3 Basic Theory Of Operation; Major Assemblies; Figure 3-1. Xts 5000 Overall Block Diagram - Motorola ASTRO XTS 5000 Basic Service Manual

Chapter 3 Basic Theory of Operation

This chapter discusses the basic operational theory of the ASTRO XTS 5000 radio, which is a
wideband, synthesized radio available in the VHF (136–174 MHz), UHF Range 1 (380–470 MHz),
UHF Range 2 (450-520 MHz), and 764 to 870 MHz frequency bands. All ASTRO XTS 5000 radios
are capable of both analog operation (12.5 kHz or 25 kHz bandwidths) and ASTRO mode (digital)
operation (12.5 kHz only).
3.1

Major Assemblies

The ASTRO XTS 5000 radio includes the following major assemblies
• VOCON Board — contains a dual-core processor which includes both the microcontroller unit
(MCU) and a digital signal processor (DSP) core, the processor's memory devices, an audio
and power supply support integrated circuit (IC), a digital support IC, and the audio power
amplifier.
• Transceiver (XCVR) Board — contains all transmit, receive, and frequency generation
circuitry, including the digital receiver back-end IC and the reference oscillator.
• Controls/Universal Flex — contains volume/on/off switch, frequency selector switch, push-to-
talk (PTT) switch, monitor button, several function-selectable switches, universal connector,
speaker, and microphone.
• Display (Models II and III Only) — 96 pixels x 64 pixels bit-mapped, liquid-crystal display
(LCD).
• Keypad (Models II and III Only) — Model II - a 3 x 2 Menu keypad with 4-way navigation
button; Model III - a 3 x 2 Menu keypad with 4-way navigation button, and a 3 x 4 alphanumeric
keypad.
External
Accessory
Connector
Note:
indicates 26
wires
Universal
Flex
13
J1 P101
(Side Connector,
Controls, LEDs,
Speaker,
Microphone)
Keypad
26
Display

Figure 3-1. XTS 5000 Overall Block Diagram

26
P201
40
J101
VOCON
Board
22
J107
40
J701
22
J301
(See Figure 3-1):
Antenna
P1 J2
Transceiver
Board
3
7.5V
J3
Battery
Encryption
Module
(Optional)