Table of Contents
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Index-vi
introduction ................................................... 3-23
front-end
description ...................................................... 2-5
introduction ................................................... 3-16
low-noise amplifier (LNA) .............................. 3-17
mixer ............................................................. 3-18
PIN diode switches ....................................... 3-17
preselector filters .......................................... 3-17
step attenuator .............................................. 3-17
troubleshooting ............................................. 4-32
radios .................................................................. 2-5
380-470 MHz band
back-end
ABACUS III IC .............................................. 3-25
description ...................................................... 2-6
IF filter ........................................................... 3-25
introduction ................................................... 3-24
front-end
description ...................................................... 2-5
first low-noise amplifier (LNA) ....................... 3-19
highpass filter ................................................ 3-19
image filter .................................................... 3-19
introduction ................................................... 3-18
low-noise amplifier (LNA) .............................. 3-19
mixer ............................................................. 3-19
preselector filters .......................................... 3-19
switchable attenuator .................................... 3-19
troubleshooting ............................................. 4-32
IF section, description ........................................ 2-5
radios .................................................................. 2-5
450-520 MHz band
back-end
ABACUS III IC .............................................. 3-26
IF filter ........................................................... 3-26
introduction ................................................... 3-26
front-end
first low-noise amplifier (LNA) ....................... 3-20
highpass filter ................................................ 3-20
image filter .................................................... 3-21
introduction ................................................... 3-20
low-noise amplifier (LNA) .............................. 3-21
mixer ............................................................. 3-21
preselector filters .......................................... 3-21
switchable attenuator .................................... 3-21
troubleshooting ............................................. 4-33
700-800 MHz band
back-end
ABACUS III IC .............................................. 3-28
description ...................................................... 2-6
IF filter ........................................................... 3-28
introduction ................................................... 3-27
front-end ........................................................... 3-22
description ...................................................... 2-6
low-noise amplifier (LNA) .............................. 3-22
mixer ............................................................. 3-23
preselector filters .......................................... 3-22
troubleshooting ............................................. 4-33
radios .................................................................. 2-6
back-end, introduction .......................................... 3-23
front-end, introduction .......................................... 3-16
June 15, 2005
primary components .............................................. 2-5
reflashing firmware .................................................. 3-76
related publications ..................................................... xx
replacement parts, ordering ....................................... A-1
reset circuits, controller ........................................... 3-66
RF board theory of operation .................................... 3-8
RF exposure compliance information ............................ ii
RFPA
136-174 MHz band
driver stage ...................................................... 3-30
final stage ......................................................... 3-30
first stage .......................................................... 3-30
theory of operation ........................................... 3-29
380-470 MHz band
driver stage ...................................................... 3-34
final stage ......................................................... 3-34
first stage .......................................................... 3-34
theory of operation ........................................... 3-33
450-520 MHz band
driver stage ...................................................... 3-38
final stage ......................................................... 3-38
first stage .......................................................... 3-37
theory of operation ........................................... 3-37
700-800 MHz band
driver stage ...................................................... 3-42
final stage ......................................................... 3-42
first stage .......................................................... 3-42
theory of operation ........................................... 3-41
stages, transmitter ................................................. 2-7
rigid circuit boards, troubleshooting ........................... 4-2
RS-232 USB bus ..................................................... 3-69
S
safety information, product ............................................ ii
sampling clock oscillator, ABACUS III IC
136-174 MHz band .............................................. 3-24
380-470 MHz band .............................................. 3-26
450-520 MHz band .............................................. 3-27
700-800 MHz ....................................................... 3-29
SB9600 serial communications ............................... 3-70
schematics
listing
main board ......................................................... 7-1
main board layouts
700-800 MHz (HUF4017A) ............................ 7-147
listing .................................................................. 7-1
UHF Range 1 (HUE4039A) .............................. 7-65
UHF Range 2 (HUE4040A) ............................ 7-106
VHF (HUD4022A) ............................................ 7-26
signal tracing procedures .......................................... 4-3
specifications, radio
700-800 MHz .......................................................xxxiii
UHF Range 1 ........................................................ xxxi
UHF Range 2 ........................................................xxxii
VHF ........................................................................ xxx
SPI bus, controller ................................................... 3-71
standard bias tables ................................................ 4-28
step attenuator (136-174 MHz band) ...................... 3-17
T
terms, glossary of .......................................... Glossary-1
6815854H01-A
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Table of Contents
Troubleshooting
