Tx System Block Diagram - Nokia RH-77 Troubleshooting Manual

Rf description and troubleshooting
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2118 (RH-77)
RF Description and Troubleshooting

Tx System Block Diagram

See the Schematics chapter for a 2118 transmitter schematic.
BB I LPF
I
I
I
VHF LO
VHF LO
VHF LO
VHF LO
From
From
From
From
÷2/÷4
÷2/÷4
÷2/÷4
÷2/÷4
Baseband
Baseband
Baseband
Baseband
90º
90º
90º
90º
457.2MHz
Q
Q
Q
Page 18
IQ Modulator
IF VGA
(IF AGC PDM)
0º 0º
90º
90º
90º
1052.61-107757MHz
©2005 Nokia Corporation
RF VGA
(RF AGC PDM)
Upconverter
UHF LO
UHF LO
UHF LO
0º 0º
90º
90º
90º
90º
90º
90º
90º
90º
Figure 10: Tx system block diagram
Company Confidential
TP1
Bandpass
PWR Amplifier
Tx SAW
Isolator
Isolator
Isolator
TP2
TP3
Power
Power
Power
Power
To Baseband
To Baseband
To Baseband
Detector
Detector
Detector
Detector
Nokia Customer Care
Antenna
Antenna
Antenna
Antenna
TP4
Duplexer
Duplexer
Duplexer
Duplexer
Cell RX
Cell RX
Cell RX
Cell RX
Issue 01 04/2005

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