AES 7088-UE Transceiver User Manual

AES Corporation Transceiver Users Manual

Users Manual

SERVICE MANUALMODEL 7088-UEFax 978-535-7313Info@aes-intellinet.comAES Corporation285 Newbury StreetPeabody,MA 01960-1315 USAPhone 978-535-7310Rev 1.0 July 10,2007AES IntelliNet
1.SPECIFICATION2.CONNECTIONS AND OPERATION 3.PERFORMANCE TEST AND ALIGNMENT4.TEST EQUIPMENT CONFIGURATION5.TRANSMITTER PERFORMANCE TEST 6.TROUBLESHOOTING 7.CIRCUIT DESCRIPTION8.PROGAMMER INSTRUCTION 9.PARTS LIST10.PRINT CIRCUIT BOARD LAYOUT11.COMPONENT PLACEMENT12.BLOCK DIAGRAMTABLE OF CONTENS
1.SPECIFICATION GENERAL SPECIFICATIONSPOWER SOURCE………………………………………………+13.8VD.C.nominal(+10.8 to +15.6V)TEMPERATURE RANGE STORAGE ………………………………………………80℃ maximum -40℃ min.25℃ nominal OPERATING……………………………………………60℃ maximum -20℃ min.ANTENNA IMPEDANCE………………………………………50ΩFREQUENCY CONTROL……………………………………………PLL SYNTHESISERFREQUENCY OF OPERATION……………………………………400MHZ-480MHZFREQUENCY TOLERANCE AND STABILITY…………………±5PPMHIGH HUMIDITY……………………………………………………90%CHANNEL CAPABILITY……………………………………………1NOMINAL DIMENSIONS …………………………………………134mm(L)X60mm(W)X20mm(H)WEIGHT ……………………………………………………………190gRADIO DATA TRANSCEIVER NOMINAL PERFORMANCEPERFORMANCE SPECIFICATIONS……………………………ETSI 300-113RF OUTPUT POWER………………………………………………5W PROGRAMMABLEMODULATION TYPE………………………………………………FMINTERMEDIATE FREQUENICES………………………………21.7MHZ 450KHZCHANNEL SPACING……………………………………………12.5KHZ,25KHZTRANSMIT ATTACK TIME………………………………………<25mSCURRENT CONSUMPTION TRANSMIT……………………………………………1800mA@5W,RECEIVE………………………………………………85mA
2.CONNECTIONS AND OPERATIONEXTERNAL CONNECTIIONS1-50Ω BNC SOCKET2-9 WAY "D" TYPE PLUG(D_SUB)D-TYPE INTERCONNECTIONSPIND_SUB-1 ANALOGUE 100Mv-2.5VP-PD_SUB-2 ANALOGUED_SUB-3D_SUB-4D_SUB-5D_SUB-6D_SUB-7D_SUB-8D_SUB-9 PGM_ENBNCPROGRAMMER DATA INPUTPROGRAMMING ENABLE0V/5VNCINPUTINPUTNC0V/NCNCPGM_DATACDSGNDPOWER SUPPLYRF CARRIER DETECTGND 0VOUTPUT+13.8VOPEN/SHORTRANGE DESCRIPTIONEXTERNAL MODULATION INPUT1VP-P0V/+5VFUNCTIONDATA_INDATA_OUTPTTRECEIVER AF OUTPUTTRANSMIT ENABLEINPUTGNDV+TYPEB+12
3.PERFORMANCE TEST AND ALIGNMENTThe alignment and performance test procedures assume the use of the following equipmentDiscrete test equipmentVolt Meter Spectrum Analyser and notch filter(option)RF Power Meter. Coupler(20dB isolation)DC Power Supply,0-15V 2A minOscilloscope,20MHz dual beamRF Frequency Counter,100KHz-600MHzAF Signal Generator 0-20KHzRF Signal GeneratorSINAD MeterModulation MeterAudio Power MeterWarning:Please keep 40cm distance away from the antenna.Only antenna which gain lower than 1.0 can be conntected to the transmitter4.TEST EQUIPMENT CONFIGURATIONEngineers (IEEE) C95. 1-1992 * Institute of Electrical and Electronic Engineers (IEEE) C95. 1-1999 Edition This device complies with the following of RF energy exposure standards and guidelines: * United States Federal Communications Commission, Code of Federal Regulations;47CFR part 2 sub-part J* American National Standards Institute (ANSI)/Institute of Electrical and ElectronicWatt Meter with20dB AttenuatorRF Signal Generator
RADIO5.TRANSMITTER PERFORMANCE TESTS Power Output1. Set the power supply voltage to 13.8V dc.and monitor the voltage during transmit.2. Switch data radio TX and check and record the output power.The nominal output.123.45678Frequency CounterSpectrum AnalyzerOSCILLOSCOPEModulation Meter20dB AttenuatorSINAD MeterAudio GeneratorVOLT MeterDC Power SupplyTest BoxTest Equipment Configuration
power is adjustable between 1 and 5W depending on the programming.3. Set the PTT switch to OFF.Peak Deviation1. Connect the oscilloscope to the output of the modulation meter.2. Set the AF signal generator to 100Hz at 5V peak-to-peak and connect to DATA_IN Line (pin 1 of D_SUB)3. Switch data radio to TX and observe the oscilloscope display to check that the 100Hz tone is a square wave.4. Using the AF signal generator,sweep from 100Hz to 3KHz and record the peak deviation.5. Check the peak deviation for appropriate channel spacing as follows: For 12.5Khz channel spacing,Peak deviation is not greater than 2.5KHz. For 25KHz channel spacing,Peak deviation is not greater than 5KHz.Spectrum TestIt may be necessary to notch the fundamental signal during this test.1. Connect a spectrum analyser and RF power meter to the antenna socket.2. Switch data radio to TX.Observe the output spectrum on the spectrum analyser.3. Adjust notch filter to minimise the carrier.All spurious and harmonics signals should be below-36dBm up to 1GHz and below-30dBm between 1 and 4GHz.4. Switch off the data radio transmit control.Receiver Performance TestsSensitivityThe SINAD performance test may be used to test the sensitivity of the receiver.1. Connect the RF signal generator to the data radio BNC antenna connector.2. Set the RF signal generator to the receive frequency.3. Connect the leads of the SINAD meter between 0V and pin 2 on D_SUB.4. Set the deviation to 60% of the peak system deviation.5. Set the AF generator to 1KHz.6. Adjust the RF signal generator level until the SINAD Meter reads 12dB.7. Check that the signal generator RF level is less than -119dBm.6.TROUBLESHOOTINGThe section includes voltage which should assist the engineer to isolate and repair the fault.Voltage measurements should be made using a high-impedance voltmeter and the values given
are with respect to ground.Careful alignment,using suitable test equipment,and quality interface cables should ensure that the radio meet their specified performance.Voltage ChartsMeasurement Condition:455.5MHz,13.8V supply,RX Carrier Present.Transistors.BCEBC ET101 0 0 0 0.44 2.5 0T871 4.96 0 4.97 4.3 2.3 4.9T323 4.5 4.7 3.8 4.5 4.7 3.8Integrated CircuitsPin U621 U401 U2401 1.35v 4.7v 4.5vRX TXRECEIVERRef. No.
2 0v 4.7v 3.8v3 0v 2.3v 3.3v4 0v 0v 4.5v5 6.9v 1.59v 4.1v6 13.7v 1.59v 4.1v7 6.9v 0v 0.6v8 1.35v 0.65v 0.6v9 0v 0.9v10 4.58v 4.5v11 0v 3.6v12 4.96v 2.2v13 4.96v 0v14 0v 0v15 0v 0v16 0v 0.9v17 0v18 0v19 4.6v20 4.6vIntegrated Circuit Voltages(Receive)Integrated CircuitsPIN U701 U6071 0.1v 1.1vTRANSMIT
2 9.1v 1.1v3 8.9v 1.1v40v0v5 0.4v 1.1v6 0.2v 1.1v7 12.4v 1.1v8 13.7v 2.3vIntegrated Circuit Voltages(Transmit)CIRCUIT DESCRIPTIONTRANSMITTER The transmitter is comprised of:
y Audio amplifier connection from D_SUB pin 1 y Frequency Synthesiser y Transmitter y Automatic Power ControlAudio frequency connections Processed data from the U601A is applied to the VCO via VR521Frequency synthesiser circuit With data received from the EEPROM (U911) the frequency synthesiser circuit controls and Produces the RF carrier frequency for the transmitter during transmit and the local oscillator frequency for the receiver.The frequency synthesiser circuit is comprised of: y 12.8MHZ VCTCXO y Voltage Controlled Oscillator (VCO) y Charge Pump and Loop Filter y PLL Frequency Synthesiser y Dual Modulus PrescalerPLL Synthesiser The PLL synthesiser circuit is common to both the transmitter and receiver, The synthesiser comprises:TCXO
12.8MHZ VCTCXOThe reference oscillator comprises VR421,CR2(12.8MHZ)and associated resistors and capacitors.CR2 provides the reference oscillator frequency and the temperature compensation that ensures that the frequency remains stableacross the temperature range(typically±2.5ppm) CR2 PIN2 is the modulation port for the two port modulation system used in the DATARADIO range of radios and is DC coupled.The reference oscillator signal direct input to the PLL synthesiser U401.Frequency adjustment is provided by VR421VCO SECTION The VCO section produces carrier frequencies during transmit and local oscillator frequencies During receive. The VCO section contains one VCO and three outputs.One for producing carrier frequencies during Transmit and one for producing the local oscillator during receive and the other Output is for PLL IC(U401)Fin.The VCO section also has Rx and TX powerline filters.RX and TX power line filters.Transistor T851、T323 is configured as a 5v power supply ripple filter.The filter reduces thenoise on the carrier and local oscillator signals.TCXO DCsupplyTX OR RX VCOData U401PLL Charge Pump Loop FilterRF Out
The VCO comprises T321,Coil L320,and varactor D303 D302.D303、D302 produces a change in frequency with a change in DC voltage and is controlled by the tuning voltage signal present atthe cathode.The local oscillator programmable dividers.DATA is received by U401 at pin 12 frompin 13 of U401.The RF signal at the collector of T321 is applied to an amplifier/buffer T322.The amplified Signalfrom T322 passes to the prescaler,U401 pin5.The RF signal at the collector of T321 also Drivesthe cascode amplifier/buffer formed by T322 and T341.When D341 is forward biased (TX ON),carrier frequencies at the collector of T341 pass to thePower amplifier and harmonic filter.When D342 is forward biased (RX),local oscillatorFrequencies at the collector of T341 pass to the first mixer (T202).PLL IC The reference frequency from the VCTCXO,at 12.8 MHZ,is connected to pin 8 of U401(LMX2332ATM)The appropriate VCO is connected to pin 13.REFDIV divides the 12.8 MHZ to produce a reference frequency (Fr) of 5 or 6.25 kHz dependentupon channel spacing selected.VARDIV divides the prescaled VCO frequency to produce avariable frequency(Fv).Fv and Fr are fed to the phase detector.Phase detectorWhen Fv=Fr,the phase detector output (pins 3 and 18,U401)produces narrow negative pulsesAnd Fv and Fr pulse widths are identical.The signal at pin 3 and 18 is smoothed the loop filterand applied to the VCO.Out-of-lock detectorThe out-of-lock detector produces a series of logic level pulses when the loop is out of lock at pin10 of U401.Charge Pump and Loop FilterAssociated resistors and capacitors form the charge pump and loop Filter.The phase detectoroutput from U401 pins 3 by the charge pump to Produce a 0 to 5v tuning voltage signal.
The signal is filtered by the loop filter (R403,E402 and E403)to remove any residual referenceFrequency harmonics from the signal.After filtering the signal is applied to the voltage controlledOscillator module.Dual modulus prescalerThe prescaler divides the VCO frequency by 64 or 65. TransmitterThe transmitter comprises:BufferWhen the radio is in transmit mode the diode D341 is forward biases enabling the modulatedRF signal from the VCO to pass to the buffer/pre-amplifier T101 and T102、T105 and associatedcomponents.VCO Buffer Amp PA ModuleRF LPFANTENNASWITCHAutomaticPower Control
The output signal is passed from T105 to T107 via a matching network consisting of InductorL119 and C119.RF power AmplifierThe signal is then amplified for transmission by T107,which is a RF power amplifier.Low pass filterThe amplified RF signal is passed through the CAP coupler and is fed to the harmonic low passfilter,comprising L112、L113、L114、L118、C147、C149、C150、C151、C154、C155 and thento the antenna connector(ANT).Antenna SwitchWhen transmitting,the diodes D101 is forward biased,allowing the RF to pass to the antenna.D102 is shorted to ground which makes L110 look open circuit(1/4 wave tuned stub).This prevents the TX signal from passing to the receiver stage.Automatic power control(APC)circuitsThe automatic power control contains the U701 transistors T701 and T702.Receiver The receiver comprises:RxVCOANTENNASWITCHFront End Amp First MixerIF Filter
Antenna SwitchIn receive,the diode D101 and D102 are reverse biased.L110 is now in circuit,passing the signalfrom the antenna to the front end without signal loss.Front EndThe receiver signal is routed to T201.It passes through the band pass filter consisting of L204、L202、L203 to T202.Diode D103 serves as protection from RF overload from nearby transmitters.IF AmpSecondMixerIFFilter LocalOscillatorAudio FilterData Out FM Limiter-DiscnminatorSquelchCircuit
The input signal is conpled to the base of T201 which serves as an RF amplifier.The output of T201 is then coupled to a second bandpass filter consisting of C211 to C212,L206L207.The output of the T201,is then coupled to the double-balanced mixer T202.The receiver front end module is factory pre-tuned and requires no adjustment.Repair is effected by replacement of the entire module.First MixerT202,2-pole crystal filters FL230 and FL231 and T215 form the First Mixer and First IF Filter.The difference frequency of 21.7 MHz is taken from T202 and is filtered by the crystal filters FL230 and FL231.The tuned circuits R230 and R235 and associated components provide matching of the crystal filters to ensure a good pass-band response and selectivity.The IF signal is amplified by T215 and passed to the FM Detector IC.Second mixer,Second IF,FM detectorThe output of the IF amplifier is fed into the narrowband FM IF Integrated Circuit,U240(TA31136F).This is a single conversion FM receiver which contains the second mixer,second IFamplifier,and FM detector.Crystal CR240,connected to pin 1 of U240,determines the second local oscillator frequency.In this case the crystal has a frequency of 21.25MHz.The first IF signal is applied to the mixerand resultant frequency of 450KHz,is the difference between the IF signal and second localoscillator.The 450KHz IF signal is output from pin 3 and is applied to a 450KHz band-pass filter.The output of FL240 is passed via pin 5 to a high gain IF amplifier coupled to the adjustablequadrature detector TR240.Any detected signal is produced at pin 9 of U240 and applied to the
Receiver Audio Circuit and the Mute(Squelch)Circuit.RSSI CircuitAny noise signal is amplified by U240 internal noise amplifier.Signal is applied to pin12 of U240 The squelch trigger output(pin 14,U240)is applied to the pin 6 of D_SUB.When noise is present,the voltage at pin 12 of U240 is exceeds 1V.The squelch trigger output is0V(logic 0)It's make pin 6 of D_SUB open state.When no noise is present,the voltage at pin 12 of U240 is less than 1V and pin 14 of U240 IS AT 5v(logic 1).This make pin 6 of U240 short state.Carrier DetectA Carrier Detect(MUTE DETECT)output is available on pin 6 of D_SUB.AF Output Low Pass FilterA low pass filter formed by C631 and R632 removes any extraneous 450KHz energy from the AFoutput of the FM receiver chip (pin 9 of U240).The filtered signal is passed to pin 2 of D_SUB.MicrocontrollerThe EM78P451AQ microcontroller IC controls the programmable features and frequency synthesizer Data.Programming ModeThe programming mode allows the user to retrieve of program TX/RX frequencies,HI/LO powerSetting and channel spacing,when pin 9 of D_SUB is set to ground.Programming mode will Inhibit,Serial communications can then be made in order to read/program the on-board EEPROM(U911)which contains radio-specific data.EEPROMRelevant channel information,such as Rx/Tx frequencies,is stored in the EEPROM(U911)whichis a 24LC08.This information may be programmed and erased via the D-type socket.
Power supply circuitThe data radio is supplied with a nominal +13.8V dc power supply input from external equipment which is filtered using C805,L801 and C804.Transmitter AlignmentAutomatic Power AdjustmentTransmit periods longer than 3 minutes are to be avoided.1. Switch to data radio to TX.2. Select High power setting.3. Record the transmit power set.4. Switch the data radio to transmitter OFF.Tuning up procedure
Frequency accuracy1. Whilst transmitting,measure the transmit frequency using the RF frequency counter.2. On the VCTCXO PCB,adjust trimmer resistor VR421 so that frequency is as close as possiable to the exact required transmit frequency.Ideally it should be within 100Hz at room temperature.Receiver Alignment Important note:Before setting up the receiver it is important to check the frequency accuracy alignment is correct as described in the transmitter alignment section.RF tuning1. Connect an RF signal generator and SINAD voltmeter.2. Set the RF signal generator to the receive channel frequency and set to 60% deviation.3. Set the AF signal to 1KHz.4. Set the RF level to 1Mv pd(-47.0dBm)5. Adjust TR240 for a maximum audio output(viewed on oscilloscope).6. Adjust L203 and L204 for lowest distortion,this is normally less than 3%.7. Check for an RF voltage signal level of -119dBm and a SINAD meter Reading greater than 12dB.Repeat steps 7 to 9 as necessary.Squelch Carrier Detect Adjustment1. Set the RF signal generator to the receiver frequency with 60% deviation.Set the AF Signal to 1KHz.2. Set RF input level to give -114dBm.3. Adjust VR1 until D_SUB pin 6 changes state from"HIGH"to"LOW".4. Reduce RF input level to -120dBm and check that CDS line goes HIGH.Switch off the RF generator and disconnect the test equipment.Modulation Deviation Adjustment1. Connect a power meter,modulation meter and oscilloscope to radio.2. The radio should be programmed to contain a channel with a frequency in the middle the band of interest with an RF power setting of 1W.3. Switch the data radio ON.4. Inject a 1Vrms(3VP-P)SINE wave signal at a frequency of 100Hz into pin 1 of D_SUB 5. Set the data radio to TX6. Observe the oscilloscope display to check that the 100Hz tone is a square ware by tuning VR521.
7. Whilst observing the oscilloscope,adjust the deviation and balance potentiometers.VR521 to obtain a good square at the following deviation: 12.5KHz channel spacing<=2.5KHz dev 25KHz channel spacing<=5KHz dev8. It may be necessary to alternate the adjustment of the two potentiometers.9. Sweep the signal generator between 100Hz and 3KHz.Record the peak deviation. The peak deviation should be as above.If necessary adjust the potentiometers to achieve this.10. Switch to RX.1. Double click AUDIOTECHNIC PROGRAMMER INSTRUCTION
2. press ‘read from radio’ button，then it will read channel data from radio.3.next showing as follow the propress of Reading data'Read from radio'buttorn
4. finished reading data of radio。5. then getting into function setup . First , select 'parameter amendment' .press OK button whenfinished reading data of radioSelect itA sound when turn onBattery power management
6.If you alter the parameter of 'high power', the output power of radio will be changed, eg. The 255 is the highest power,the 0 is the lowest powerPress the 'write to radio' button,then changed parameter willbe saved to radioselecting 160 in the highpower box ,you can set 2woutput power.scan mode1.carrier wave2.timecarrier wave timetime-lapse timescan endreturn timemointor current channelwork statussquelch level selectfirst channelchannel mode1.priority channel scan2.cycscan
only the data in those two boxis different ,can thehighpower and lowpower beset.for example,if you set 100in the box of highpoer andlowpower in the same time,the computer will default thehightpower. this dialog box will emerge when youcontinuous read or write the data of radioseveral times,power down the radio and thenreopen it will be ok

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