Service manual

Service Manual SD170E Series
Page 26 of 44
Ext. Mod. signal flow in Transmitter
Level
Detector
Analog S/W
MC14053B
Data BPF
Sub-Audio LPF
MF6
Z1
Z
Y1
Y
Adj. Level
MCU
Check Audio In
Tone En
Audio In
Mod Out
Sub-Audio
Encoder
Y0
Z0
X1
X
X0
High : Audio In
Low : No Audio
Data Enable
Data In
Analog S/W
MC14053B
Sub-Audio LPF
MF6
Z1
Z
Y1
Y
MCU
Y0
Z0
X1
X
X0
Pre-Selector
RF Board
Sub-Audio LPF
4th Order
AF
IF IC
SA605DK
RSSI
Comparator
MF6Tone Detector
RSSI
Audio Out
Busy
Ext. Mod. signal flow in Receiver
BPF
30Hz ~ 5KHz
FFSK signal flow diagram
Data BPF
Master MCU
Mod Out
Sub-audio option is ignored.
Serial Data In Serial Data In
(CMX589A)
GMSK Modem
Option Board
Tx_CLK
Rx_CLK
Tx_Data_Out
Rx_Data_In
RDI
RxC
TDO
TxC
Tx_Signal
Slave MCU
Tx_En
Rx_En
RF Board
AF
IF IC
SA605DK
RSSI
RSSI
Busy
Serial Data Out Serial Data Out
(CMX589A)
GMSK Modem
Option Board
Tx_CLK
Rx_CLK
Tx_Data_Out
Rx_Data_In
RDI
RxC
TDO
TxC
Rx_Signal
Slave MCU
Tx_En
Rx_En
Master MCU
GMSK signal flow in Transmitter GMSK signal flow in Receiver
GMSK signal flow diagram