User Guide

After Sales
Technical Documentation
Transceiver Overview THA–4S Page 3–4
Original, 12/95
Figure 1: RF Block Diagram
PA
DRIVER
TX VCO
RX VCO
DETECT
824–849Mhz
POWER
CONTROL
TX
RX
4V8_RX
COUPLER
X6
F1
F2
F1
F2
DUPLEXER
LNA
SAW
MIXER
86.85MHz
IF CHIP
30kHz bw
30kHz bw
ANT
ANT
SWITCH
EXT
ANT
DAF
RSSI A/D
VCTCXO
VCTCXO
TX_MOD
VBAT
NOKIA MOBILE PHONES R&D COPENHAGEN
H500 NAMPS
DATE
15 – 5 –95
RF MOD. BLK
DRAWN
ISSUE
FILENAME
SF
6
450kHz
86.4MHz
881 MHz
25MHz bw
869–894MHz
450kHz
F1
F2
TX MIXER AMP
TX_LO
TX SAW
P1
DUAL – PLL
P1 P2
P3
P0
131.85MHz
836MHz
25MHz bw
IF_FREQ
RX_VCO_ADJ
4V8_TX
CLK
DATA
ENB
Power_level_set_2
Power_level_set_1
Power_level_ctrl
Lock_Detect
TX_Carr_Pres
TX MIXER
P3
AMP
RX RX
IF FILTER
Vref
IF AMP