Motorola GTX 2000 Service Manual page 32

GTX/GTX LTR/LTS 2000 Portable Radios Service Manual
1ST
RX IN
BANDPASS
FILTER
1ST
CRYSTAL
FILTER
0 dBm
FROM
VCO BUFFER
RX_AUDIO
DET_AUDIO
28-PIN
CONNECTOR
FROM RF SECTION
June 1999
Ò5RÓ (5 V)
RF
AMP
IF
AMP
RECEIVER BLOCK DIAGRAM
TXB+
POWER
COUPLER
MODULE
Vcontrol
RECTIFIER
TRANSMITTER BLOCK DIAGRAM
LOGIC SECTION FOR FUF1492B AND FUF 1493B
2.1 MHz
MOD_IN
4 X 4 KEYPAD
ASFIC
MIC_IN
MIXER
2ND
BANDPASS
FILTER
LO +3 dBm
2ND
IF IC
CRYSTAL
FILTER
RX IN
ANTENNA HARMONIC
SWITCH FILTER
POWER
CONTROL
POWER CONTROL REFERENCE
FROM DAC
8-DIGIT
LCD DISPLAY
DISPLAY/KEYBOARD DRIVER
PARALLEL BUS
ROM 128K RAM 8K
68P02945C75-A
Transmitter
DETECTED AUDIO
ANTENNA
MATCHING
SERIAL
EEPROM 4K
SPI BUS
LOW-BAT
PTT PTT PTT
µPROCESSOR
MONITOR
HC11K1
OPT
LOCK_DET
SYNT_EN
PEND_EN
SCI
ROT1
ROT2
VOL_SENSE
DAC_SEL
2-3