Motorola MTR2000 Manual page 60

L3500
+5V
1800nH
C3500 C3501
R3500
.100µF .100µF
6800
R3501 C3503
REV_CONTROL
4700 .100µF
R3504
+10V
10K
R3505 C3504
3300 .100µF
LOCK_01
LOCK_02
SL_L01
SL_L02
REF_LEVEL
CHANGE_FREQ
R3508
+8V
10K
Metering Service Notes
Signal
Description/Nominal Signal Levels
Path
The 8 bit A/D converter communicates with the Station Control Module via the SPI bus lines MOSI
A
and MISO. The inputs to the chip are levels that are used for diagnostic purposes and to identify the
type of exciter board.
R3502
10K
BAND_RANGE
R3503 R3510 C3502
5600 18K .100µF
20 14 13
15 VDD VREF VAG
R3509 CS*
18 SCLK
10K
1 AN0
19
2 AN1
EOC
U3500
3 AN2
4 AN3 17
DATA IN
5 AN4
6 AN5 16
DATA OUT
7 AN6
8 AN7
9 AN8
11 AN9
12 AN10
GND
10
A
C3505
R3506 R3507
.100µF
3300 10K
METERING
CIRCUITRY
RF_IN
A
+10V
SPI_CLK
4
VCC
ADT_CS*
U3000-5
VEE
11
3
MOSI
U3000-1
2
MISO
C
R3002
TX_ENABLE
10K
C3008
680pF
+5V
TX Switch Service Notes
Signal
Path
Input from Tx Buffer. RF_IN; RF level approx. +14 dBm;
A
RF_OUT to the BNC connector (connected to the PA module). RF level approx. +14 dBm (+12 to +16 dBm) when Tx-
B
switch is enabled; Tx-level < -30 dBm when Tx-switch is disabled
TX_ENABLE; 0-5 V logic level; High level enables the switch; Low level disables the switch
C
When the switch is enabled, the output of U3000-3 is approx. +8.5 V, this feeds current through CR3000. At the same
time, the output of U3000-4 is approx. +1.5 V, no current is therefore feed through CR3001 and CR3003.
When the switch is disabled, the output of U3000-4 is approx. +8.5 V, this feeds current through CR3001 and CR3003.
At the same time, the output of U3000-3 is approx. +1.5 V, no current is therefore feed through CR3000.
C3003
CR3000
680pF
L3001
C3004
1800nH
680pF
L3002
CR3002
1800nH
L3003
C3001
1800nH
680pF
C3002
680pF
C3007
C3009
680pF
.100µF
R3000 R3001
560 560
1
+10V
CR3004
3.3V
R3003
47K
5
R3005
7 10
R3006
U3000-2
8
6
47K U3000-3
9
10K
R3004
C3000
10K
10000pF
+1.5V, Switch enabled
+8.5V, Switch disabled
RF ISOLATION
CIRCUITRY
Description/Nominal Signal Levels
EXCITER MODULE
MODEL TTD6301C
L3004
B
1800nH
C3005
680pF
C3006
RF_OUT
680pF
CR3003
CR3005
R3007 3.3V
10K
12
14
U3000-4
13
+1.5V, Switch enabled
+8.5V, Switch disabled
68P81094E12-D
Schematics (Sheet 9 of 14)
12/26/01