Basic Theory Of Operation; General Overview - Motorola ASTRO XTS 5000 I Basic Service Manual

Basic Theory of
Operation
General
Overview
The ASTRO Digital XTS 5000 radio is a wideband, synthesized radio available
in the 764 to 870 MHz band. All ASTRO Digital 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).
The ASTRO Digital XTS 5000 radio includes the following major assemblies
(see Figure 1.):
• 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.
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