– 17–
– 18 –
SPP-M937
02
ROW0 – ROW5
BUFFER
U9 (1/2)
LOW-PASS FILTER
U9 (2/2)
ATTENUATOR
Q1
ANT1
(ANTENNA)
EXPANDER
CIRCUIT
COMPRESSOR
CIRCUIT
FIL2
IN
LOW-PASS
FILTER
2
FIL2
OUT
1
FIL1
IN
LOW-PASS
FILTER
3
FIL1
OUT
4
EXP
OUT
20
COMP
OUT
COMP
MUTE
5
16
IN2
6
BUFFER
U14 (1/4)
BUFFER
U14 (2/4)
BUFFER
U14 (3/4)
OSC
Q22
RO1
OUT
18
LED1
KEY MATRIX
(SEET KEY)
DI
CLK
DO
CS
EEP CS
EEP DO
PLL DATA
PLL CLK
PLL EN
X1
4MHz
43
XOUT
2
XIN
3
44
46
45
47
3
2
4
1
• SIGNAL PATH
: RX
: TX
PRE
IN
PREAMP
23
RIN
RO1 AMP
MIC
AMP
19
MIC
NF
10
21
RX DATA
L1RINGER OFF
L1RINGER LO
19
LINE1 LED
ATTN DATA
28
26
EXP
MUTE
OSC IN
OSC OUT
TONE
OUT
X2
3.58MHz
15
14
TEN
2
25
DTMF EN
56
HS BEEP
20
TX DATA
29
CHARGE LED
INTCOM LED
MUTE LED
LED1
LINE 1
LED6
LED2
LINE 2
S2, 3
RINGER LEVEL
S1
DIAL MODE
LED4
MUTING
LED3
LED6
CHARGE
LED4
LED2
BACKUP B+
LED3
INTERCOM
65-70
D0 – D3
9 – 12
D0 – D3
57 – 60
61-64
EEPROM
U4
SYSTEM CONTROLLER
U2 (1/2)
COMPRESSOR, EXPANDER, NOISE GATE
U6
DTMF TONE
GENERATOR
U11
73
74
75
76
10 9
L2RINGER OFF
L2RINGER LO
12 11
TONE/PULSE
24
LINE2 LED
77
COL0 – COL3
+
+
+
6
7
PULSE
TONE
A
(Page 19)
B
(Page 19)
TX MUTE
RX MUTE
CAR DET
BASE RF BOARD
RX AUDIO
TX AUDIO
PLL DATA
PLL CLK
PLL EN
PLL REF
CAR DET
ANT
2
1
6
7
1
2
8
9
6
7
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM – BASE UNIT SECTION (1/2) –
Содержание SPP-M937
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