1

SGH-X640 SVC TRAINING

H/W RADIO PART

BYUNGKYU CHA

DATE : 2005. 03. 09
PLACE : GUMI, KOREA

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CONTENTS



RF BLOCK DIAGRAM



FREQUENCY PLAN



TRANCEIVER (UAA3536)



PART PLACEMENT



TROUBLESHOOTING



GSM RECEIVER



GSM TRANSMITTER



DCS RECEIVER



DCS TRANSMITTER

3

BLOCK DIAGRAM

4

FREQUENCY PLAN

EGSM900

DCS 1800

TX

RX

TX

RX

CH frequency TXLO frequency RXLO

CH frequency TXLO frequency RXLO

1

890.2

1900.4

935.2

1870.6

512

1710.2

1824.2

1805.2

1805.3

30

896

1912

941

1882.2

586

1725

1839

1820

1820.1

62

902.4

1924.8

947.4

1895

612

1730.2

1844.2

1825.2

1825.3

90

908

1936

953

1906.2

698

1747.4

1861.4

1842.4

1842.5

124

914.8

1949.6

959.8

1919.8

746

1757

1871

1852

1852.1

975

880.2

1880.4

925.2

1850.6

812

1770.2

1884.2

1865.2

1865.3

1023

889.8

1899.6

934.8

1869.8

885

1784.8

1898.8

1879.8

1879.9

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TRANCEIVER(UAA3536)

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

Signals



POWER ENABLE : RXON, TXON, SYNON, FESWON



TXRFI : input from TX VCO



TXCPO : transmit modulation loop charge-pump
output



RFCPO : RF charge-pump output



FESW1, FESW2 : controls external Antenna switch
logic

UAA3536 - comment

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TROBLE SHOOTING –

GSM RECEIVER

8

TROBLE SHOOTING –

GSM TRANSMITTER

9

TROBLE SHOOTING –

DCS RECEIVER

10

TROBLE SHOOTING –

DCS TRANSMITTER

11

QUESTION