Icom IC-F30GT Service Manual
Also see for IC-F30GS: Instruction manualService manualInstruction manualInstruction manualServise manual
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4 - 44-4 FFSK CIRCUIT DESCRIPTION4-4-1 GENERALIC9 is the compounder IC which is controlled by serial databus line (“TRD”, “MSKE”, “DIN”, “SCK”, “APST”, “REGS1”,“REGS2”, “RTM”, “RDT”, “FCLR” signals) from the CPU.The IC is composed of FFSK transmitting and receiving cir-cuits, data register circuits, transmitting and receiving databuffer circuits, and so on.X4 is oscillated 3.58 MHz reference signal to the IC9.4-4-2 DECODEING CIRCUITThe input signal from the FM IC (IC3, pin 9) via the “DSIN”signal is applied to the compounder IC (IC9, pin 5), and isthen detected bit synchronization detection within 16 bit.4-4-3 ENCODEING CIRCUITThe FFSK signal is made by serial data bus line signals, andis then output from the compounder IC (IC9, pin 6).In case of the FFSK signal is used for the PM modulation,the FM/PM switch (IC29) is changed to pin 3.In case of the FFSK signal is used for the FM modulation,the FM/PM switch (IC29) is changed to pin 5.The output signal from IC29, pin 4 is applied to the the bufferamplifier (IC7, pins 8, 10), and is applied to the D/A conver-tor IC (IC13, pins 21, 22). The signal is applied to the mod-ulation circuit (Q12, D7, D8, D43–D45).COMPRE-MSKMODMSKDEMODBEXPAN-DERCOMPANDERIC9 TC35453FSSORMCINX4Q472SC4081 MCOTCR-5633.58 MHz29, MSKE30, TRD23, DIN25, REGS126, REGS231, RTM32, RDT33, FCLRIDCINTXFO81RXFOMICINTXOUT123RXIN5MSKIN28276922, SCK22, APSTSERIAL DATA LINELPFAMPLIMITAMPAMPHPFLPFAMPBUFFHPFLPFAMPBPFHPFAMP• Conpounder IC block diagram |
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