TM-241_Service_操作说明书手册2

TM-241A/EDESCRIPTION OF COMPONENTSTX-RX UNIT(X57-369X-XX)0-11:K,P,X0-12:K2,P20-21:M0-22:M2,M32-71:E,E9,EM2-72:E2Ref.NoUse/FunctionOperation/Condition compatibility1C12nd local oscillator.1:1st If signal input.D1IF amplification.01Q53.4:2nd local oscillator.NOISE AMP NOISE DET.AF AMPDetection.9:Busy output.HSM23088AS116GNDLow-frequency amplification,10:Squelch control.02Noise amplificationGND11 S-meter output.Q2 SWAF FILTERNoise detection,14 RD output.MIX,AMP,DETDTC2SC1541161C1:MC3372RASquelch switching15:Low-frequency output.(GR)x2376821091114131C2AM detectorIC3AF amplification1:AF input 6:AF outputIC4Electronic volume conntrol,2:AF output.7 Panel volume input.AF switch3:"L*during step-up.8:Panel volume output.4:'L'during step-down.10:AF input.5:H"when electronic volume selected.IC5Shift registerSee circuit description.IC65VAVR1C710V AVRFor PLL.IC8Transmit driveIC98V AVR1C201MicroprocessorSee circuit description.1C2026V AVRQ1High-frequency amplificationOperates in receive mode.Q211R switchingOn when the aircraft band is selectedQ3BPF switchingOn when the aircraft band is selected.Q41st mixerConverts received 144MHz-range signals to 1st IF.Q5High-frequency amplificationAmplifies 1st IF signal.Q6Q5 gain controlQ7Detector output switchWhen the aircraft band is selected,the FM detection switch is turned off.Q8AF amplifierWhen the aircraft band is selected,the output signal from the AM detector is amplified.09(12)RD line muteOn when DRS unit replays.Q92/2)AF line mute010Low-frequency amplificationOperates when DRS unit replays.Q12AF line muteOperates when transmit mode,AL 1ch receive mode.CTCSS.T.ALT or squeich is on.Q138R switchingOn in receive mode.Q148T switchingOn in transmit mode.1C5-8013PLL 1C-14Q15BR switching controlOn in receive mode.Q168T switching controlOn in transmit mode.D916Q178T switching controlOff in transmit mode.0188T switching controlOff when PLL locked.D8018亲11