Class B AIS transponder MA-500TR (798204), страница 2
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It is thenoutput to the connected equipment through the [NMEA IN/OUT] connector (CONNECT UNIT: J1).• GPS DATA INPUT (From the [NMEA IN/OUT] connector)• AIS DATA DECODING CIRCUITSRXD1_NTXDATARX1INRX2INIC501AISbasebandprocessorLOGICUNITCPUIC1RXDATACONNECTUNITREG UNITIC211IC201,IC202,IC203LevelConv.RS424DriversNMEA2ONMEA3O• AIS ENCODINGQ402D401-D403TX VCOMOD2TCXOX501CONNECT-AUNITLOGIC UNITShmittriggerIC201D202GPSINPUTJ1GPSRXD654321453627Q403BUFFQ404IC402BUFF1/2MAIN UNIT• GPS DATA INPUT(From the [INTERNAL GPS RECEIVER CONNECTOR])IC202NMEA1INMEA2INMEA3IPhotoCuplersThe data signal is applied to the TCXO and the TX VCOto obtain Gaussian Minimum Shift Keying (GMSK). Themodulated signal is passed through two buffers (Q403 andQ404) and the divider (IC402), which divides the frequencyin two, and is then applied to the TX AMP circuits.• GPS DATA INPUT (REG UNIT)(From the [INTERNAL GPS RECEIVER CONNECTOR])The position data (NMEA signal) from the GPS receiver(MXG-5000) is up-converted to 5 V by the insulated coupler(IC201), and then adjusted in waveform by the Schmitttrigger (IC202).
The signal is down-converted from 5 Vp-pto 3.3 Vp-p by R209 and R210, and then applied to theCPU (LOGIC UNIT; IC1) as the "GPS_RX" signal to beprocessed.GPSRXIC212ShmittriggerCONNECTUNIT• AIS ENCODING AND MODULATION (MAIN UNIT)The processed signal is output from the CPU (LOGIC UNIT;IC1) as AIS serial data to the AIS baseband IC (IC501) andencoded.4-2 TRANSMIT CIRCUITSCPUIC1RXD2RXD3IC204,IC205,IC206Q201,Q202,Q203D201,D203,D205D202,D204,D206NMEA1OTXD1TXD2TXD3[NMEA IN/OUT]TXDATACPUIC11(From the MXG-5000)4-2MOD1MAIN UNITREG UNITLOGIC UNITTXDATAIC501AIS basebandprocesserTXDATATo the TX amplifiers• TX AMPLIFIERS• TX-VCO (For transmitting)The TX signal from the divider (IC402) is amplified by thepre-drive AMP (Q421), YGR AMP (Q422) and the powerAMP (IC404) to obtain the TX output power.TX-VCO generates the TX signal.
The VCO is GMSKmodulated by applying the data signal to D403.To ensure that all AIS data is transmitted, the VCO isrunning even while receiving, to eliminate PLL lock up time.Thus the VCO generates a signal whose frequency is twotimes of that of the transmit signal, to prevent interferencewhile receiving. Q402 is the oscillator, Q403 and Q404 arebuffer AMPs.
The buffer-amplified signal is applied to theprescaler (IC402).The TX signal is passed through the antenna SW (D1) andthe LPF (L2, L3, C4, C5) which attenuates the harmoniccomponents in the TX signal, before it is sent to theantenna.• APC CIRCUITA portion of the signal is fed back to the PLL circuits in theAIS baseband processor (IC501) through the buffer AMP(Q405).The forward and reflected waves on the TX line are detectedby the directional coupler (L427 and L428). The reflectedwave is rectified by D413, resulting in a DC voltage that isapplied to the A/D port of the CPU (LOGIC UNIT; IC1). Theforward wave is rectified by D412, resulting in a DC voltagethat is applied to both of the A/D port of the CPU (LOGICUNIT; IC1) and the APC AMP (IC403) through the buffer(IC407).• PLL CIRCUITRYIC11 is a dual PLL IC which contains a pair of PLL circuits;prescaler, phase comparator and charge pump.
The19.2 MHz reference frequency signal is provided by X501.The APC AMP (IC403) compares the input voltage with thereference voltage from the CPU, and outputs the resultingvoltage which controls the gain of the power AMP (IC404)to keep the TX output power constant. When the PLL isunlocked, Q414 cuts off the power supply for the powerAMP (IC404) to prevent unintended transmission, when thePLL is unlocked.One of the PLL circuits is used for generating the 1st LOsignal for receiving channel B, and is composed of the loopfilter (R301–R303, C301–C305).The other PLL circuit is used for generating the 1st LOsignal for receive channel A, and is composed of the loopfilter (R351–R353, C351–C355).• TX AMP AND APC CIRCUITSQ421PREDRIVEQ422YGRAM PD412,D413IC404PWRAM PLPFThe AIS baseband processor (IC501) contains PLL circuitryto control the TX VCO.
The 19.2 MHz reference clock isprovided by the TCXO (X501) and it is also used as the PLLreference frequency signal.MAIN_ANTMAIN UNITRF OUTDETD1,D2ANTSWLPFIC403,IC407REV_PWRFWD_PW RPRTPCON• FREQUENCY SYNTHESIZERTo the RX circuitsAPCCTRLQ302D301,D302Osc.freq.:125.150-131.150 MHzQ304Q303LOOPFILTERVCO-BBUFFBUFFQ1021st mixerfor channel BQ305BUFF4-3 FREQUENCY SYNTHESIZER (MAIN UNIT)PLLIC11• VCO-A (For receiving the channel A)Osc.freq.:134.325-140.325 MHzQ355VCO-A generates the 1st LO signal for receive channel A.Q352 is the oscillator, Q353 and Q354 are buffer AMPs. Thegenerated signal is buffered, and then applied to the 1stmixer for channel A (Q202) as the 1st LO signal.BUFFQ352D351,D352LOOPFILTERPLL control signalA portion of the signal is fed back to the PLL IC (IC11)through the buffer AMP (Q355).• VCO-B (For receiving the channel B)Q353VCO-AQ354BUFFBUFFOsc.freq.:312.050-324.050 MHzQ403TX-VCOBUFFQ405TCXOX501IC501BUFFRFINCP1MOD2MOD1LOOPFILTER4-31st mixerfor channel AQ402D401-D403VCO-B generates the 1st LO signal for receive channel B.Q302 is the oscillator, Q303 and Q304 are buffer AMPs.
Thegenerated signal is buffered, and then applied to the 1stmixer for channel B (Q102) as the 1st LO signal.A portion of the signal is fed back to the PLL IC (IC11)through the buffer AMP (Q305).Q202TX AMP circuits4-4 CPU (LOGIC UNIT; IC1) PORT ALLOCATIONPinNo.Linename23589L_WR0L_CS1L_RSTEDATAECKDescriptionLCD driver write control.LCD driver chip select signal (2/2).LCD driver reset controlEEPROM serial data.EEPROM serial clock.3 V power line control.3VCH=Power ONRVASFT VCO SW control.RXD3 NMEA signal from the GPS equipment.TXD3 NMEA signal to the GPS equipment.RVASFT VCO SW control.Responder power control.PWRONH=While the power is ON.TX mute control.PRTH=MuteA17Parallel data ports for the DRAM (IC3).Q16Parallel data ports for the DRAM (IC3).OOOOOA15–A1 Parallel data ports for the DRAM (IC3).OCLOUT Cloning data.AF line SW control.41 CH_SELL=Channel A42L_CD LCD driver chip disable signal.43L_CS0 LCD driver chip select signal (1/2).51 GPS_RX Data interface for MXG-500052 GPS_TX Data interface for MXG-500053 ALM_LVL Alarm loud level control.54 SLOT_O Clock output.
(For the AIS baseband processor)55RXD1 NMEA signal from the GPS equipment.56–L_D0–LCD driver parallel data ports.58L_D259TXD1 NMEA signal to the GPS equipment.60ALARM Collision alarm control.62, L_D3, L_LCD driver parallel data ports.63D465–D0–D15 Parallel data ports for the DRAM (IC3).83[BRILL] input.84BRILLL=Pushed.Alarm outpot control.86 ALERTCH=While the alarm is output.[CLR] input.87CLRL=Pushed.O10111213141517181920–3740PinNo.I/O89909394O100OIOO101104–106O116O118119120122OO124O126OOIOOOI127128129130131O132OO134135136OO137,138I139O140I144LinenameDescriptionI/O[MENU] input.L=Pushed.[DISP] input.DISPL=Pushed.TXD2 NMEA signal to the GPS equipment.RXD2 NMEA signal from the GPS equipment.PLL IC power control.PSL=WhileAF output control.CH_OUTL=AF output.L_D5–LCD driver parallel data ports.L_D7Clock output.EXSCC(For the AIS baseband processor)LBAT External power source detector.FWD_P Forward wave sensing voltage.REV_P Reflected wave sensing voltage.TEMP Temperature sensing voltage.Transmission mute.TXMUTEH=Mute.PLL unlock detect.UNLKH=Unlocked.BPFBC Channel B BPF tuning voltage.BPFAC Channel A BPF tuning voltage.[ ] input.UPL=Pushed.[ ] input.LEFTL=Pushed.[ENT] input.ENTL=Pushed.[ ] input.RIGHTL=Pushed.PCKPLL serial clock.PDATA PLL serial data.PSTB PLL strobe.RAM_WR0,Parallel data ports for the DRAM (IC3).RAM_WR1RAM_RD DRAM (IC3) read/write control.[ ] input.DOWNL=Pushed.RAM_CS DRAM (IC3) chip select signal.MENUIIOIOOOOIIIIOIOOIIIIOOOOOIO5-5 VOLTAGE BLOCK DIAGRAMVoltage from the power supply is routed throughout the transponder through regulators and switches.HV(12 V)Power AMP (MAIN UNIT: IC404)HVHVIC3013.3 V3.3VCPU (LOGIC UNIT; IC1), EEPROM (LOGIC UNIT; IC2),DRAM (LOGIC UNIT; IC3), RESET IC (LOGIC UNIT; IC4)3.3VREGHVREG UNITLOGIC UNITIC15 V5V25 V DC-DC converter (LOGIC UNIT; IC205),MXG-5000, etc.BuzzerDriverVCCIC151D151Q151−Q153Buzzer+5 VREG25V25 VDC-DC5VQ1,Q2VCC(12 V)BPF tuning voltage buffer (LOGIC UNIT; IC302),LCD backlights (LOGIC UNIT; DS2–DS28)VCCVCCPWRCTRLHVIC28 V8VReceive and transmit circuitsMAIN UNIT3.3 VAIS baseband processor (MAIN UNIT; IC501),PLL IC (MAIN UNIT; IC11), AF AMP (MAIN UNIT;IC102 and IC202), etc.3.3V8VIC601Q601,Q602+3.3 VREG4-48V+8 VREGVCCCHASSISSECTION 5.ADJUSTMENT PROCEDURE5-1 PREPARATION¤ REQUIRED EQUIPMENTSEQUIPMENTGRADE AND RANGEEQUIPMENTGRADE AND RANGEPower supplyVoltageCurrent capacity: 12.0 V:2ACloning softwareCS-MA500TR CLONING SOFTWARE(Revision 1.0 or later)RF power meter(50 Ω terminated)Measuring rangeFrequency rangeSWR: 0.1–5 W: 100–300 MHz: Less than 1.2 : 1Frequency counterFrequency range: 0.1–300 MHzFrequency accuracy : ±1 ppm or betterInput level: Less than 1 mWModulationAnalyzerFrequency rangeMeasuring range: 30–300 MHz: 0 to ±10 kHzVoltmeterMeasuring range: 0–10 VAttenuatorPower attenuationCapacity: 30 dB: More than 5 WStandard signalgenerator (SSG)Dummy load(50 Ω terminated)Frequency rangeOutput level: 0.1–300 MHz: –20 dBµ to 90 dBµ(–127 to –17 dBm)Capacity: More than 5 W¤ ENTERING ADJUSTMENT MODE• Clone the adjustment mode into the MA-500TR using the CS-MA500TR.5-2 FREQUENCY ADJUSTMENTSADJUSTMENTTransponder’SCONDITIONOPERATIONADJUSTMENTITEMVALUECP6 (CH-A)(On the MAIN UNIT)1.3–2.3 VLOCK VOLTAGEVERIFICATION-Receive (CH-A)-1 • CH-A• Receiving: 88B 1) Enter to [ADJUSTMENT RX].2) Connect a voltmeter to CP6 (CH-A).-Receive (CH-B)-2 • CH-B• Receiving: 88B • Connect a voltmeter to CP5 (CH-B).CP5 (CH-B)(On the MAIN UNIT)1.4–2.6 V-Transmit-3 • TX CH: 88B 1) Connect a dummy load to the antenna.2) Enter to [ADJUSTMENT TX].3) Connect a voltmeter to CP7.CP7(On the MAIN UNIT)1.4–2.5 VTRANSMITFREQUENCYVERIFICATION1 • TX CH: 88B 1) Connect a dummy load to the antenna.2) Loosely couple a frequency counter to• Transmittingthe antenna connector.(Push [MOB])3) Enter to [ADJUSTMENT (TX)].[TX POWER](On the display)162.02500MHz(±300 Hz)• ADJUSTMENT AND CHECK POINTSR483L102L103L104255BCP7CP22MP1MP1CP5CP6FI103FI103FI203I202LOCK VOLTAGEVERIFICATION-Receive (CH-A)-LOCK VOLTAGEVERIFICATION-Receive (CH-B)-5-1LOCK VOLTAGEVERIFICATION-Transmit-5-3 TRANSMIT ADJUSTMENTSTransponder’sCONDITIONADJUSTMENTTX OUTPUTPOWER(Preset)1(Adjustment)2• TX CH• Receiving: 88BOPERATIONADJUSTMENTITEM1) Connect an RF power meter to theantenna connector.2) Enter to [ADJUSTMENT (TX)].3) Set the preset value.[TX POWER](On the display)VALUE"720"R483• TX CH: 88B• Transmitting(Push [MOB])• Adjust the TX power.R483(On the MAIN UNIT)1.95–2.0 W• CONNECTIONRF POWER METER(5 W/50 Ω)• ADJUSTMENT POINTTX OUTPUTPOWER(ADJUSTMENT)MP7MP8R4835-2MP35-3 TRANSMIT ADJUSTMENTS (Continued)Transponder’sCONDITIONADJUSTMENTOPERATIONADJUSTMENTITEMVALUEDEVIATION(Preparation)1• TX CH: 88B• Transmitting(Push [MOB])• Loosely couple a frequency counter tothe antenna connector.[ADJUSTMENT (TX)]Note thefrequency asthe reference.(Adjustment)2• TX CH: 88B• Transmitting(Push [MOB])1) Connect a modulation analyzer tothe antenna connector through anattenuator, and set it as;HPF: OFFLPF: 20 kHz2) Adjust the deviation using [ ]/[ ].2.40–2.5 kHzlower thanthe referencefrequency.3• TX CH: 88B• Transmitting(Push [MOB])[TCXO DEV][VCO DEV]±2.40 to ±2.5kHz• CONNECTIONMODULATION ANALYZER(0.1–300 MHz)SETTINGHPFLPFDe-emphasisDetector: OFF: 20 kHz: OFF: (P-P)/2FREQUENCY COUNTER(Loosecoupling)(0.1–300 MHz)ATTENUATOR(35 dB/5 W)ADJUSTMENTTransponder’sCONDITIONOPERATIONADJUSTMENTITEM[SWR 3](On the display)VSWR DETECT(VSWR=3)1• TX CH: 88B• Transmitting(Push [MOB])1) Enter to [ADJUSTMENT (TX)].2) Connect a 150 Ω dummy load to theantenna connector.(VSWR=5)2• TX CH: 88B• Transmitting(Push [MOB])• Connect a 250 Ω dummy load to theantenna connector.• CONNECTIONDummy loads5-3[SWR 5](On the display)VALUEPush [ ] tostore the value.Push [ ] tostore the value.R4835-4 RECEIVE ADJUSTMENTSTransponder’sCONDITIONADJUSTMENTRX SENSITIVITY(CH-A)VALUE1 NOTE: When "RX SENSITIVITY" is re-adjusted, "CARRIER WAVE SENSITIVITY" must be readjusted too.• CH-A• CH-B• Receiving(CH-B)ADJUSTMENTITEMOPERATION: 88B 1) C o n n e c t a n S S G t o t h e a n t e n n a: 88Bconnector and set it as;Frequency : 162.025 MHzLevel†: 17 dBµ (–90 dBm)Modulation : None2) Connect a voltmeter to CP4, and adjustthe voltage.3) Enter to [ADJUSTMENT (RX)].2• Connect a voltmeter to CP3, and adjustthe voltage.Max.
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