Table Of Contents - Nokia RA-2 Rf Description & Troubleshooting

RA-2/3
7 - RF Description and Troubleshooting

Table of Contents

CMT RF................................................................................................................. 5
Top-level description.......................................................................................... 5
RA-2 test point locations ................................................................................... 6
Test points ......................................................................................................... 8
RF implementation in RA-2/3 ........................................................................... 11
Frequency plan .............................................................................................. 11
RF block diagram ........................................................................................... 12
Antenna switch module (ASM) ....................................................................... 12
DC characteristics .......................................................................................... 13
Regulators ................................................................................................. 13
DC supply currents .................................................................................... 13
Typical current consumption...................................................................... 14
Power distribution diagram ........................................................................ 15
RF characteristics ............................................................................................ 16
Channel numbers and frequencies ................................................................ 16
RF Troubleshooting .......................................................................................... 17
Receiver description and troubleshooting ........................................................ 17
Rx front end ................................................................................................... 17
Antenna ......................................................................................................... 17
Receiver characteristics ................................................................................. 18
General instructions for Rx troubleshooting ................................................... 19
Troubleshooting diagram for GSM850 receiver......................................... 23
Troubleshooting diagram for GSM900 receiver......................................... 24
Troubleshooting diagram for GSM1800 receiver....................................... 25
Troubleshooting diagram for GSM1900 receiver....................................... 26
Transmitter description and troubleshooting .................................................... 27
Power amplifier .............................................................................................. 27
RF ASIC Helgo .............................................................................................. 27
AFC function .................................................................................................. 28
Transmitter characteristics ............................................................................. 28
General instructions for Tx troubleshooting ................................................... 28
Transmitter troubleshooting diagram......................................................... 30
HELGO IC troubleshooting diagram.......................................................... 31
PA and antenna switch troubleshooting diagram ...................................... 32
Pictures of transmitter signals ................................................................... 33
Additional information for EDGE troubleshooting ............................................ 35
Transmitter EDGE troubleshooting diagram.............................................. 36
HELGO EDGE troubleshooting diagram ................................................... 37
PA and antenna switch EDGE troubleshooting diagram ........................... 38
Pictures of EDGE transmitter signals ............................................................. 39
Synthesizer description and troubleshooting ................................................... 43
Frequency synthesizers ................................................................................. 43
General instructions for synthesizer troubleshooting ..................................... 43
Troubleshooting diagram for synthesizer .................................................. 44
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