Motorola ASTRO XTL 1500 Detailed Service Manual page 448

test points, troubleshooting ...................................... 5-10
theory of operation
136-174 MHz band
frequency generation unit (FGU)
charge pump bias ......................................... 3-48
introduction ................................................... 3-45
lock detect ..................................................... 3-48
loop filter ....................................................... 3-48
LV Frac-N synthesizer .................................. 3-46
modulation .................................................... 3-47
prescaler feedback ....................................... 3-49
receiver injection ........................................... 3-49
receiver VCOs .............................................. 3-49
reference oscillator ....................................... 3-46
superfilter ...................................................... 3-47
transmitter injection ....................................... 3-48
transmitter VCOs .......................................... 3-49
voltage multiplier ........................................... 3-47
major board sections .......................................... 3-8
receiver
back-end ....................................................... 3-23
front-end ....................................................... 3-16
transmitter
introduction ................................................... 3-29
ON (output network) ..................................... 3-30
power control ................................................ 3-31
power control loop ........................................ 3-32
protection mechanisms ................................. 3-33
RFPA ............................................................ 3-29
380-470 MHz band
frequency generation unit (FGU)
charge pump bias ......................................... 3-52
introduction ................................................... 3-49
lock detect ..................................................... 3-52
loop filter ....................................................... 3-52
LV Frac-N synthesizer .................................. 3-50
modulation .................................................... 3-51
prescaler feedback ....................................... 3-53
receiver injection ........................................... 3-52
receiver VCOs .............................................. 3-53
reference oscillator ....................................... 3-50
superfilter ...................................................... 3-51
transmitter injection ....................................... 3-52
transmitter VCOs .......................................... 3-53
voltage multiplier ........................................... 3-51
major board sections ........................................ 3-11
receiver
back-end ....................................................... 3-24
front-end ....................................................... 3-18
transmitter
introduction ................................................... 3-33
ON (output network) ..................................... 3-34
power control ................................................ 3-35
power control loop ........................................ 3-36
protection mechanisms ................................. 3-37
RFPA ............................................................ 3-33
450-520 MHz band
frequency generation unit (FGU)
charge pump bias ......................................... 3-56
introduction ................................................... 3-54
6815854H01-A
lock detect .................................................... 3-56
loop filter ....................................................... 3-56
LV Frac-N synthesizer .................................. 3-55
modulation .................................................... 3-56
prescaler feedback ....................................... 3-58
receiver injection ........................................... 3-57
receiver VCOs .............................................. 3-57
reference oscillator ....................................... 3-55
superfilter ...................................................... 3-56
transmitter injection ...................................... 3-57
transmitter VCOs .......................................... 3-57
voltage multiplier ........................................... 3-55
major board sections .........................................3-11
receiver
back-end ....................................................... 3-26
front-end ....................................................... 3-20
transmitter
introduction ................................................... 3-37
ON (output network) ..................................... 3-38
power control ................................................ 3-39
power control loop ........................................ 3-40
protection mechanisms ................................. 3-41
RFPA ............................................................ 3-37
700-800 MHz band
frequency generation unit (FGU)
charge pump bias ......................................... 3-60
introduction ................................................... 3-58
lock detect .................................................... 3-60
loop filter ....................................................... 3-60
LV Frac-N synthesizer .................................. 3-59
modulation .................................................... 3-60
prescaler feedback ....................................... 3-62
receiver injection ........................................... 3-61
receiver VCOs .............................................. 3-62
reference oscillator ....................................... 3-59
superfilter ...................................................... 3-60
transmitter injection ...................................... 3-61
transmitter VCOs .......................................... 3-61
voltage multiplier ........................................... 3-59
introduction ....................................................... 3-41
major board sections ........................................ 3-13
receiver
back-end ....................................................... 3-27
front-end ....................................................... 3-22
transmitter
ON (output network) ..................................... 3-42
power control ................................................ 3-43
power control loop ........................................ 3-44
protection mechanisms ................................. 3-45
RFPA ............................................................ 3-41
controller
description ........................................................ 3-62
DSP system clock ............................................ 3-68
MCU system clock ........................................... 3-68
power-up/power-down sequence ..................... 3-67
serial peripheral interface (SPI) bus ................. 3-71
daughtercard module ........................................... 3-64
receive audio ....................................................... 3-72
RF board description ............................................. 3-8
trademark information ................................................... ii
transmit audio, main board ...................................... 3-73
Index-vii
June 15, 2005