User Manual

SDB670 – SERVICE MANUAL TNM-M-E-0032
May 13 Page 42 TECHNICAL DESCRIPTION
Figure 10. Tx and Rx Modules – VHF/UHF Block Diagram.
VCO BUFFER
CRYS TAL
FILTER
45MHz
RX-LNA
TUNED
FILTER
30W PA
HARMONIC
FILTER
DRIV ERBUFFE R
BP FILTER
PLL
MIXER
TX/RX SW ITCH
FB BUFFER
IF AGC AMP
TRANSMITTER
RECEIVER SECTION
DUAL VCO'S & BUFFERS
SYNTHESISER
7dBm
AUDIO PROCESSING
AUDIO POW E R
AMPLIFIE R
DSP
SPI
FLASH
PROCESSOR
RECE IVE R FRONT END
TX VCO
ANTE NNA SW ITCH
POWE R
CONTROL
COMPARATOR
VARACTOR
BIAS SUPPLY
ADAP TIV E LOOP FILTER
ANALOG OUTPUTS
14 CH D/A
CONV E RTER
ANALOG INPUTS
DIGITAL OUTPUTSDIGITAL INPUTS
ADC DRIVE R
TX VCO
ALC
D/COUPLER
DETE CTOR
CONTROLLER
FPGA
RAM
SECURITY
TUNED
FILTER
DIFFE RE NTIAL
FILTER
TEMPE RATURE
CONTROL
CD-DIN
21.6MHz
REFERE NCE VCTCX O
M1
CD-DOUT
CODE C
SYN-ALCS ET
TEMP SENS OR
LM94022BIMG
TX-MOD
CLIP PER
SYN-AFC
MIC-AUDIO
CLOCK S YNTHESIZER
ADC
PA-TX MON
PA-TEMPSENSE
VCO-BIAS
LOOP-VOLTS
CD-DIN
CD-DOUT
CD-MCLK
CD-DATA
AlN-
AlN+
PLL-DATA
PA-ON2
SYN-AFC
SYN-ALCSET
SYN-VARSE T
TUNE1
TUNE2
TUNE3
TUNE4
RX-AGC
PA-TX PW R
SYN-LOCK
IGN-SENS E
PW R-SENSE
SPKR-MUTE
SPKR-
SPKR+
TX-MOD
SYN-LOCK PLL-DATA
SYN-VARSET
CPP-IN
FIN-RF
VCO-RFOUT
VCO-BIAS
CPP-OUT
5V-TX
RX-LO
TUNE_1 TUNE_2
TUNE_4 TUNE_3
PA-TXPWR
PA-ON1
PA-TEMPSENSE
RX_IN
RX-AGC
ADC_CLOCK
RECEIVE D DATA
CLOCK-DATA
DCLK
DCLK
SYN-RE F2
57.6MHz
95.04MHz
21.6MHz 21.6MHz
21.6MHz
PA-ON2
LOWPASS
FILTER
RX VCO
RX V CO
ALC
VCO-BIAS
SYN-ALCS ET
VCO-BIAS
VAR-BIAS
CRYS TAL
FILTER
45MHz
RECEIVE R IFRECEIV ER DEMODULATOR
PA-ON1
ANTENNA SOCKET
EXT-TX-AUDIO
EXT-RX-AUDIO
400 to 480MHz
355 to 435MHz
SPKR-MUTE
DIGITAL BUS
PA-TXMON
LOOP-VOLTS
CURE NT
LIMITE R
PA-ISENSE
PA-IS E NSE
395 to 475MHz
355 to 480MHz
355 to 480MHz
400 to 480MHz
400 to 480MHz
400 to 480MHz
45MHz 45MHz
45MHz
45MHz
355 to 480MHz