Motorola ASTRO Digital Spectra Plus

Index-3
6881076C25-E September 5, 2008
assembly
circuit protection 2-5
components 2-1
DC interconnect 2-5
description 2-5
gain stages 2-5
power control 2-5
description 3-55
troubleshooting
800 MHz band 4-66
UHF band 4-47
VHF band 4-21
UHF band
40-Watt 3-72
high-power 3-68
VHF band
25/10-Watt 3-59
50-Watt 3-63
high-power 3-55
power control, power amplifier assembly 2-5
power supplies, control-head assembly 2-4
power-up self-check
diagnostics, Spectra Plus 4-11
errors
Spectra 4-2
Spectra Plus 4-10
power-up/-down sequence, command board 3-9
power-up/power-down sequence, radio
Spectra 3-28
Spectra Plus 3-46
product safety information 1-ii
programmable reference divider, synthesizer 3-4
publications, related 1-xvii
R
radio
800 MHz voltage-controlled oscillator assembly 2-7
B+ power routing 2-9
command board assembly
components 2-1
description 2-7
theory of operation 3-8
control-head assembly 2-1, 2-2
DC power distribution 2-8
frequency bands 2-1
front-end receiver assembly 2-1, 2-6
overview 2-1
power amplifier assembly 2-1, 2-5
RF board assembly
components 2-1
description 2-6
receiver back-end circuitry 3-6
synthesizer circuitry 3-3
theory of operation 3-1
UHF voltage-controlled oscillator assembly 2-7
VCO/buffer/divider board assembly 2-1
VHF voltage-controlled oscillator assembly 2-6
VOCON board assembly
asynchronous buses
Spectra 3-22
Spectra Plus 3-43
components 2-1
controller bootstrap
Spectra 3-22
Spectra Plus 3-43
controller memory map, Spectra 3-24
controller section
Spectra 3-15
Spectra Plus 3-38
description 2-7
DSP system clock
Spectra 3-28
Spectra Plus 3-44
MCU system clock
Spectra 3-28
Spectra Plus 3-44
power-up/power-down sequence
Spectra 3-28
Spectra Plus 3-46
RX signal path
Spectra 3-18
Spectra Plus 3-41
serial peripheral interface (SPI) bus
Spectra 3-24
Spectra Plus 3-44
signals, Spectra 3-29
theory of operation
Spectra 3-15
Spectra Plus 3-38
TX signal path
Spectra 3-21
Spectra Plus 3-42
vocoder bootstrap, Spectra 3-24
vocoder memory map, Spectra 3-26
vocoder section
Spectra 3-17
Spectra Plus 3-39
voltage regulators, Spectra Plus 3-45
VOCON Plus board assembly 2-1
voltage-controlled oscillator (VCO) assembly 2-6
received audio, command board 3-12
receiver
back-end
ABACUS II IC 3-7
first IF 3-6
front-end
800 MHz band 3-54
description 3-53
troubleshooting
800 MHz band 4-20
UHF band 4-20
VHF band 4-20
UHF band 3-53
VHF band 3-53
reference frequency generation, synthesizer 3-3
regulator and power control IC, command board 3-14
regulators, command board 3-10
related publications 1-xvii
replacement parts, ordering B-1
reset circuits, command board 3-10
RF board assembly
components 2-1
description 2-6
theory of operation 3-1, 3-8
RF board troubleshooting 4-5