Operating instructions

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R50 BLOCK DIAGRAM
05/9155/0001 1
8-Apr-2003 10:08:37
D:\Protel Files\Work Files\9155_0002.ddb - Documents\Block_Diagram.Sch
Title
Size: Number: Print Date: File:
Revision:
Sheet of
A3
RF Technology Pty Ltd
Unit 10, 8 Leighton Place
Hornsby, NSW 2077
AustraliaRev. Release Date: Originator:
Rev No. ECO No. Description of Change
25-50MHz BANDPASS FILTER
RF. AMP Q401
25-50MHz BANDPASS FILTER
BOULLE BAL.
MIXER MX401
1ST IF AMP
Q402
246MHz SAW FILTER FIL401
BOULLE BAL. MIXER
MX401
2ND IF AMP
Q403 FIL404 FIL405
21.4MHz XTAL FILTER
NOISE BLK GATE
Q404
FIL402
IMPULSE NOISE
1ST LO AMP
2ND LO AMP
MA502 MA505
MA504 MA506
Q405 Q406U403 D401
IMPULSE NOISE DETECTOR AMPLIFIER
U404A Q408 U303B Q407
GAIN CONTROL BLANKER GATE CONTROL
BLK PULSE GENERATOR
FIL403
X401 CERAMIC DISC
455KHz CERAMIC FILTER 455KHz CERAMIC FILTER
X402 21.855MHz
U401
FM IF RECEIVER CHIP
1ST VCO 2ND VCO Q501 Q502
X402
REF
DUAL PLL CHIP U302
IST VCO BUFFR AMP 2ND VCO BUFFR AMP
MA501 MA503
3RD LO
RSSI
RSSI BUFFER
U402D
NOISE DETECTOR D403 U402C
HIGHPASS FILTER U402A NOISE AMP U402B
AUDIO AMP
U605A
LOWPASS FILTER
1ST PLL LOOP FLT 2ND PLL LOOP FLT
SUB_TONE
SUBTONE AMP U605C
U605B
DE-EMPHASIS / FLAT
U607A U607B
U609B
LINE SQUELCH U607D
LINE OUT LINE OUT
DIR AUDIO
AUDIO AMP AUDIO AMP
MONITOR AMP U609C U609D U604
MON SQUELCH U607C
MON OUT
X601 4MHz
CTCSS CHIP
U602
RSSI
N DET
RF INPUT
DE-EMPHASIS / FLAT LINE SQUELCH MONITOR SQUELCH SERIAL BUS (CLOCK MOSI CHIP_SELECT)
COS+
COS-
T601
RL602
COS CONTROL
U601 RL601
COS CIRCUIT
LOOP CONTROL
C619
A/D
RSSI NSQ VIN LINE LEVEL 1ST LO BIAS 2ND LO BIAS CSQ
DAC U301
SERIAL_BUS
NSQ SET
NSQ_SET
REF SET 3RD LO SET
3RD LO SET
REF SET
PWR SQ ALARM
MICRO PROCESSOR U204
RS232 TRANCEIVER
U201 U202
RS 232
SUB AUDIO AUDIO