Fairfield BOX-RU Geophysical Data Telemetry System User Manual RU07 Appendix 5

Fairfield Industries Inc Geophysical Data Telemetry System RU07 Appendix 5

Operating Manual

THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 0 of 27Appendix 5Remote Unit Radio System
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 1 of 27Appendix 5Contents1.0 Overall Description of RU2.0 RF Module2.1 Overall Description2.2 Dallas Temperature Sensor2.3 Cartesian Loop Linearizer2.3.1 Operation2.3.1.1 Instability Detection2.3.1.2 DC Null2.3.2 Transmit/Receive Switching2.4 Receiver2.5 Power Amplifier (Transmitter)2.5.1 Overall Description2.5.2 Sub-Modules2.5.3 Power amplifier2.5.4 Transmitter Mask2.5.5 Electrical Specifications2.6 Synthesizer2.6.1 Performance Parameters3.0 Baseband Module3.1 Overall Description3.2 Processor3.3 Codec3.4 Memory3.5 Clock Generation3.6 Parallel Host Interface3.7 Temperature Sensing4.0 RU Power Supply5.0 RU Signals and Connections5.1 RF Module5.1.1 Power Amplifier5.2 Synthesizer5.3 Receiver5.4 Baseband Module
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 2 of 271.0 Overall Description of RUEach remote unit (RU) is mounted on and powered by a Battery power unit.All RUs are identical, each containing a stack of five interconnected circuit boards, held together byspacers and secured by shock mountings. As shown in figure 1, the board order (top to bottom) is:Radio System RF ModuleRadio System Baseband ModuleMain CPU ModuleADC Module #1ADC Module #Remote Unit - AssemblyFigure 1The radio sub-system, which includes the RF and Baseband boards, is able to• Transmit data to the CRS using 16QAM transmission at 60 kb/s (up-link) and• Receive commands from the CRS, which have been transmitted using 10 kb/s QPSK transmission(down-link).RF Board Baseband Board CPU Board ADC Board #1 ADC Board #2Antenna Connector
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 3 of 27The whole radio sub-system is depicted in block form in figure 2.Transmit/ReceiveSwitchData I/O Digital SignalProcessor MemorySigma-DeltaDAC / ADCBaseband InterfaceSynthesiserIQ DemodulatorIQ ModulatorTx RxCouplerRadio Sub-System Block DiagramFigure 2
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 4 of 272.0 RF Module2.1 Overall DescriptionThe RF Module of the RU contains• the receiver for commands downlinked from the CRS and• the transmitter for uplinking data from the RU to the CRS.With reference to figure 3 it can be seen that the RF modle can be split into six discrete sub-modules,these being:Cartesian Loop LinearizerTransmitter/Power AmplifierTransmit/Receive SwitchSynthesizerReceiverDallas temperature sensorThe RU Receiver is described in 2.4 and the RU Transmitter/Power Amplifier in 2.5. PACartesianLoopLinearizerReceiverDALLASSENSORBaseband Board ControlTX/RXSwitch20.48 MHz LO I & Q OutputsAntennaSynthesizerI & Q InputsCouplerRemote Unit RF Module Overall Block DiagramFigure 3:
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 5 of 272.2 Dallas Temperature SensorThe temperature-sensing device (manufactured by Dallas Corporation) is programmed by theBaseband board and incorporates two important features.First it provides a temperature measurement system with a one-second acquisition time, thedata being read as an integer byte via a two wire serial (i2c) line.Second it incorporates 256 bytes of non-volatile memory for storing details unique to theindividual amplifier – such as phase control voltages, phase and image-balance information,and model details including serial number and revision details.2.3 Cartesian Loop LinearizerFigure 4 shows a block diagram of the linearizer.Linearizer – Block DiagramFigure 42.3.1 OperationA fraction of the transmitted power is fed back from the output via the coupler. Further attenuation isrequired to reduce the signal to a level suitable for input to the down-converter, where the signal issplit and down-converted, with two carriers of 90º phase difference yielding the I and Q basebandsignals.φdBdBτIQLow-Pass FiltersLocal OscillatorPhaseShifterDelay LineRF Feedbackfrom CouplerRF Modulationto PAFeedback GainSample and HoldSwitchableAttenuatorSwitchableAttenuatorUp-ConverterDown-Converter
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 6 of 27Feedback gain is provided by low-noise operational amplifiers.The signal is then subtracted from the modulation input and the forward-path error signal is low-passfiltered and pre-amplified at baseband.2.3.1.1 Instability DetectionDuring operation, the loop may become unstable. Therefore, to monitor loop stability, a circuit isprovided which detects energy in the output spectrum at around 200 kHz above the carrier.If the loop starts to become unstable, high frequency components appear in the outputspectrum and correspondingly at baseband level.A high-pass filter is used to isolate these higher frequencies, which are then fed through an amplitudedetector. When the detected amplitude reaches a preset dc detected level, an instability error isflagged.2.3.1.2 DC NullAs a result of carrier up/down-converter feed-through during Power Amplifier operation, a steadily-rising carrier component can be seen on the output spectrum. This may also be seen at baseband asa dc component superimposed on the I and Q signals. As this is essentially an unwanted tone in theoutput spectrum it must be removed.Removal is achieved by sampling the magnitude of this dc component at the start of transmission,and removing it from the following thirty seconds of transmission.2.4 Transmit/Receive SwitchingANAREN20dB COUPLERHarmonicFilterTX/RXReceivedSignalTransmit-ReceiveSwitchRF_INRF_FB50ΩLoadCoupler and Transmit/Receive SwitchingFigure 5PIN diodes are used to direct signals from the antenna during Receive and to the antenna duringTransmit.
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 7 of 27These diodes can be biased either positive or negative by Transistor switch Q4.The RF path is determined by the PIN diodes’ bias which, in conjunction with matching circuitry,appears to BOX RF signals as quarter wavelength sections. These sections have the ability tobehave as open circuits or 50Ω line depending on the polarity of the bias voltage.
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 8 of 27The RF LO is fed into a Wilkinson power divider, giving an approximate 3 dB split.One half is used directly by the Cartesian loop at –10dBm.The other is fed through a small gain stage to provide a +10dBm signal for the receiver.2.4. ReceiverThe RU receiver, which is part of the RF board, provides the RF receiver path for the Commanddownlink. Demodulation is achieved through ac-coupled direct conversion, which is suitable forQPSK.V-TxD4L7 R74C53/63 C151/152Q4 Tx /RxFrom TxPowerAmplifier C62Passes Tx Signal to Antennawhen V-Tx is highTransmissionPathTransmissionPathRx RFL2L12C48C27C29 L22C37 C52 C80 D15C79AntennaReceived andTransmitted SignalsReception PathL1 When Tx/Rx is HIGH, Radio Section is in.TRANSMIT Mode. When Tx/Rx is LOW, Radio Section is in.RECEIVE Mode.Transmit/Receive Switch & RF Paths to and from AntennaFigure 66.5 V
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 9 of 27Baseband Ito BasebandBoardBaseband Qto BasebandBoardDownConverterLow-NoiseGain StagesRF_INLO Driver LO to PA+ + 420.48MHzREF+10dBm LO856-936MHz214-234MHzSerial ProgrammingBUSActiveFilterFinal GainStagesdBGainSwitchHighLowReceiver Block DiagramFigure 7The receiver is capable of operation in two modes: high-gain and low-gain.• The high-gain setting is employed for maximum sensitivity and introduces an additional 20 dB gainstage in the receive path.• The low-gain setting is used for maximum signal handling, introducing a 4 dB pad in the receivepath, preventing saturation when large signals are encountered.The RF signal received at the antenna is band-pass filtered and passed through the high/low gainswitch.It is then fed into a Mini-Circuits down-converter (JSIQ-234D1) and mixed with the +10 dBm LO,resulting in the production of I and Q baseband signals. These I and Q signals are fed into a lownoise op-amp stage, consisting of a CLC428 with a voltage gain of about 10.The baseband signals are then fed into an active filter chain, with a roll-off from 80 to 140 kHz. Thefinal stage involves amplitude-balancing, followed once again by a low-noise gain stage. Thebaseband I and Q signals are then fed to the baseband Remote Unit board.
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 10 of 272.5Power Amplifier (Transmitter)2.5.1 Overall DescriptionThe RU transmitter, which is shown in block form in figure 8, is part of the RF module.It provides the data uplink channel for both command and sample data.The transmitter consists of a Cartesian linearized power amplifier suitable for both 16QAM datamodulation and (if required) linear voice modulation. The RU Transmitter’s chief specifications aresummarised as follows:Output Power: +27 dBmRF power control: 58 dBSupply voltage: 12 V nominal, 10.5 V min, 14.8 V max.Channel bandwidth: 20 kHzData format: Pilot aided 16QAM2.5.2 Sub-ModulesThe RU transmitter contains two sub-modules, the Power Amplifier and the Cartesian Linearizer.Power ControlTransmitter ControlPA SwitchSwitchedAttenuatorQuadratureDemodulatorBaseband LNAPhase Shifter(360°)LoopFilter QuadratureModulator SwitchedAttenuator PADriver PA Tx/RxSwitch HarmonicFilter AntennaTx EnablePowerControlLO Up(214-234 MHz)IQLO Down(214-234 MHz)DirectionalCouplerTo ReceiverPower AmplifierRemote Unit – Radio TransmitterFigure 8
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 11 of 272.5.3 Power AmplifierThe power amplifier sub-module provides most of the RF gain and final output drive for the RUtransmitter. Also included is transmit/receive switching and an output coupler for the Cartesianlinearizer.This output coupler provides the forward-path gain and the final output drive. Figure 9 shows thethree-stage device line-up employed. High or low gain modes can be selected depending on therange of output level required. BFP193 MRF557 D1211UK12V @ 30mA20dB Gain 12V @ 100mA15dB Gain 12V @ 400mA22dB GainDevice line-up (high gain setting)Figure 9Feedback is employed on the first two stages to reduce the gain from the maximum available. Whenthe device is switched OFF in the low-gain mode, the feedback on the second stage also provides anRF forward-pathThere is a signal gain of 56 dB in high-gain mode and approximately 23 dB in low-gain mode.The Semelab D1211 is capable of 40 dBm output and is under-driven to maximize the intermodulationdistortion performance of the PA.2.5.4 Transmitter MaskFigure 10 shows the transmit mask in direct mode. All numbers are power relative to the wantedchannel, measured in a 20 kHz bandwidth.
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 12 of 27Transmitter MaskFigure 102.5.5 Electrical SpecificationsFrequency Range: 216 - 220 MHzOutput power: 0.5 W (27 dBm)Stability: Stable with loads ≤ 3:1 (all angles)High Gain: 56 dB nom.High Gain flatness: ±1 dB max.Low Gain: 22 dB nomLow Gain flatness ±1 dB maxPower added efficiency: 30% min.Noise floor: ≤ -90 dBm/Hz at ≥ 2 MHz from carrierThe above powers are measured at the antenna connector.2.6 SynthesizerThe RU Synthesizer is part of the RF module. It is illustrated in block schematic diagram in figure 11.This synthesizer serves two main purposes:• Generation of the local oscillator required for the direct down-conversion receiver.
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 13 of 27• Generation of the two local oscillators required for the direct up-conversion Cartesian looptransmitter.Control of synthesizer frequency is achieved by programming the synthesizer hardware via a serialbus.In order to avoid possible interference problems in transmit-mode the voltage-controlled oscillator(VCO), which forms part of the synthesizer, runs at four times the fundamental operating frequencyReferenceConditioning SynthesiserVCO856-936 MHzPower SupplyDivideby4BufferAmplifierPower-10 dBmOutput+10 dBmOutputREF_OSCRU Synthesizer – Block DiagramFigure 112.6.1 Performance Parameters2.6.1.1 Transmit & Receive FrequenciesThe operating band is 216 to 220 MHz in 20kHz channels and the synthesizer is able to generate a216.01 to 219.99 MHz Local Oscillator, programmable in 10kHz steps.2.6.1.2 Phase NoiseThe synthesizer’s frequency-dependent phase noise is illustrated in Figure 12.2.6.1.3 Lock timeLess than 20 ms.2.6.1.4 Spurious outputHarmonics < 30 dBcNon harmonics <70 dBc
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 14 of 27Synthesizer Phase NoiseFigure 123.0 Baseband Module3.1 Overall DescriptionThe Remote Unit baseband board, which is shown in block form in Figure 13, comprises a singledigital signal processor (DSP) with ancillary memory and peripherals.This sub-module carries out the following functions:• Modulation of the uplink 16QAM baseband signal• Demodulation of the downlink QPSK baseband signal• Command and data communications with the host processor through the host parallel interface• RS232 communications for firmware downloads and for use in testing.• Timer functions to control the duty cycle in sleep and standby modes.• Power supply management and regulation for baseband and RF board switching.• Digital I/O associated with control of the RF board and PA module• Digital I/O signals to/from the host CPU card• Clock generation for Codec, processor and frequency locked reference• Local frequency reference pulling• Analog control signals for the RF module (if required)
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 15 of 27DSPTMS320C50Serial I/FCODECCS4225Audio OutI OutQ OutI InQ InClockGenerator Freq. RefVCTCXO7.68MHz20.48MHzVCXOFPGAAddress Decode, Device Select, Host I/FAddressBusHost Data(16 bit)FLASH 128k120nsData Bus(16 bit)RAM32k 70nsUARTRS232Non-VolatileRAM256 bytesStandbyLow powerProgrammableTimerPower SupplyConditioning&ControlWake UpDAC8 bit serial(Low power)RepeaterSwitching2.048MHzAudioInTx ITx QRx IRx QRP Rx/Tx IRP Rx/Tx QiicLoop phase20.48MHzDigitalI/ORf ControlBatteryVoltagePowerControlHostControlRemote Unit - Baseband Sub-ModuleFigure 133.2 ProcessorThe baseband sub-module is designed around a single 40.96 MHz Texas Instruments TMS320C50digital signal processor which is capable of performing all modulation, demodulation, control andcommunication tasks on the RF module.3.3 CodecA single Crystal Semiconductor CS4225 Codec device performs most of the analog to digital anddigital to analog conversion. This device also provides channel and anti-aliasing filtering of thebaseband signals.An additional low current DAC provides phase control of the Cartesian loop transmitter. The completeanalog signal set is:• I in • Cartesian loop phase control output• Q in • Frequency reference adjust• I out• Q out
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 16 of 27 3.4 MemoryThree types of memory are provided in the baseband module for program and data storage:• FLASH RWM• Static RAM• Non-volatile RAM3.5 Clock GenerationA clock generator circuit derives the following clock waveforms from the 20.48 MHz frequencyReference on the board. This Reference is locked to the base-station Master Reference duringreceive:• 7.68 MHz to drive the Codec at the correct sampling rate• 20.48 MHz DSP clock. This is clocked into the DSP in ×1 mode to give a minimum internal cycletime of 48.82 ns, corresponding to a basic processor speed of 20.48 MIPS.• 2.048 MHz - a divided and buffered version of the on-board reference for use by the CPU hostWhen the RF module is frequency locked (i.e. during receive mode); stability of all clocks is ±0.5 ppmwith respect to the Central Recording System’s Master Reference.At other times, when the on-board reference is free-running, clock stability is ±3 ppm.It is the responsibility of the host CPU to ensure the integrity of any data transferred to the radiosystem for the purpose of firmware updates before the transfer is made.3.6 Parallel Host InterfaceA parallel bi-directional interface is provided between the Host CPU (Motorola 68336 processor) andthe RF board TMS320C50 processor. This interface is used for passing:downlink messages from the radio system to the host CPU anduplink data from the host to the radio.Additionally the host interface is used for control messaging issued by the host CPU, and for anysubsequent baseband replies.3.7 Temperature sensingThermal monitoring is provided on the radio transmitter, with the baseband module DSP able to readthe PA temperature and ascertain if it is approaching its maximum recommended operatingtemperature. Data from this sensor is made available to the host processor over the host parallelinterface.
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 17 of 274.0 RU Power SupplyThe RU is powered by a power-supply unit (or “battery pack) located beneath and attached to the RUhousing as shown in figure 14.The unit contains one 12 V --- AH rechargeable lead-acid battery, which may be recharged withoutremoving it from the unit.Figure 14The Power-Supply Unit may be rectangular for land use as or cylindrical for marine use as illustratedin fires 15 and 16 respectively. Land Power Unit Marine Power Unit Figure 15 Figure 16Annotated Photograph ofRU with Land Battery BoxAssembly Drawing Assembly Drawing
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 18 of 275.0 RU Signals and Connections5.1 RF Module5.1.1 Power Amplifier5.1.1.1 External InterfacesExternal interfaces to the transmitter sub-module are defined as those signals which leave the radiosystem RF board. They therefore include all• transmitter control signals which originate on the baseband board, and• all status signals that go to the baseband board.Table 1 lists the signals that constitute the external interface between the Power Amplifier(transmitter) and the rest of the Remote Unit (excluding signals internal to the RF module).Signal Name Direction Type Description20dB_ATT_B In Digital HCMOS power control: 20dB step10dB_ATT_A In Digital HCMOS power control: 10dB step25dB_DOWN In Digital HCMOS power control, down converter:switches in delay line25dB_UP In Digital HCMOS power control, up converter:switches second stage of PAANT In/Out RF Antenna connector50Ω SMA femaleBATT In Power Unregulated power supply for PADC_NULL In Digital Cartesian loop dc null controlGND In Power GroundI_DOWN Out Analog Baseband I channel output (to receiver)Q_DOWN Out Analog Baseband Q channel output (to receiver)I_UP In Analog Baseband I channel input (from codec)Q_UP In Analog Baseband Q channel input (from codec)INSTB Out Digital Transmitter instability detector (to DSP)PA_ON In Digital Switches PA onPH_CTL In Analog Cartesian loop phase controlTX_RX In Digital Switches between Tx & Rx modeSCL In Digital PA temperature sensor ClockSDA Out Digital PA temperature sensor Serial DataRU Transmitter - External/Interface SignalsTable 1
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 19 of 275.1.1.2 Internal InterfacesTable 2 lists the internal interface signals between the Cartesian Linear Transmitter and the other sub-modules on the RF module.Signal Name Direction Type DescriptionC10V In Power Power supply for CLTRegulated from raw battery powerS2V5 In Power Power supply for CLTRX_RF Out RF Received RF output to Receiver front-endFrequency range: 214 - 234 MHzSource impedance: 50Ω nominalPower: 0 dBm maxRF_FB In RF Coupled RF input from PA directional couplerRF_MOD Out RF Low level modulated RF output to PARx_D In RF Down converter RF input from Receiver front-endLO_+10dBm In RF Local oscillator input for down converter50Ω, +10 dBm nom.LO_-10dBM In RF Local oscillator input for up converter50Ω, -10 dBm nominal RU - Interface Signals between Cartesian Linear Transmitter Sub-Module andother Radio Board Sub-ModulesTable 2:5.2 Synthesizer5.2.1 InterfacesAll interfaces to and from the synthesizer are internal, i.e. between the synthesiser and other sub-modules within the RF module.5.2.1.1 InputsSignal Name DescriptionS5V Synthesizer +5 V Power supply50 mA maxS10V Synthesizer +10 V Power supply10 mA maxGND Analog groundS_CLK Synthesizer serial data clockHigh impedance CMOS inputData clocked in on rising edgeS_DATA Synthesizer serial dataHigh impedance CMOS inputData entered MSB firstContinued Overleaf
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 20 of 27S_LE Synthesizer load enableHigh impedance CMOS inputWhen SLE goes high, data stored in synthesizer shift registers is loadedinto the appropriate latch.REF_OSC 20.48 MHz Reference oscillator inputSynthesizer – Input SignalsTable 35.2.1.2 OutputsSignal Name DescriptionLO_+10dBm LO output to the down-converter+9 dBm, ±1 dB, nominal impedance 50ΩLO_-10dBm LO output to the transmitter up-converter-8 dBm, ± 2 dB, nominal impedance 50ΩSynthesizer – Output SignalsTable 45.2.1.5 Internal InterfacesSignal Name Direction Type DescriptionC10V In Power Power supply for CLTRegulated from battery powerS2V5 In Power Power supply for CLTRX_RF Out RF Received RF output to Receiver front-endFrequency range: 214 - 234 MHzSource impedance: 50Ω nominalPower: 0 dBm maxRF_FB In RF Coupled RF input from PA directional couplerRF_MOD Out RF Low level modulated RF output to PARx_D In RF Down converter RF input from Receiver front-endLO_+10 dBm In RF Local oscillator input for down converter50Ω, +10 dBm nominalLO_-10 dBM In RF Local oscillator input for up converter50Ω, -10 dBm nominalSynthesizer – Internal InterfacesTable 75.2.1.6 Digital Control SignalsSignal Direction Connector Type DescriptionSLE In P2: 15; 16 TTL Synthesizer enableS_DATA In P2: 17; 18 TTL Synthesizer dataS_CLOCK In P2: 19; 20 TTL Synthesizer clockPA_ON In P2: 25; 26 HCMOS PA bias switchContinued overleafDC_NULL In P2: 29; 30 HCMOS Transmitter DC NullLOW = Null; HIGH = normal transmit
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 21 of 27RX_GAIN In P2: 31; 31 HCMOS RX gain HI/LO switchCON In P2: 35; 36 HCMOS Cartesian loopRON In P2: 37; 38 HCMOS ReceiverSON In P2: 39; 40 HCMOS SynthesizerTX_RX In P2: 42; 43 HCMOS Transmit/ReceiveLOW = receive; HIGH = transmitSCL In P2: 45; 46 HCMOS Dallas chip clockSDA In P2: 47; 48 HCMOS Dallas chip dataINSTAB In P2: 51; 52 TTL Transmitter unstableLOW = unstable; HIGH = unstable20DB_ATTB In P2: 55; 56 HCMOS Power control (see Table 9)10DB_ATTA In P2: 57; 58 HCMOS Power control (see Table 9)25DB_UP In P2: 59; 60 HCMOS Power control (see Table 9)Synthesizer – Digital Control SignalsTable 85.3 Receiver5.3.1 Receiver Inputs, Outputs and Internal SignalsThese are shown in Table 9.Signal Name Direction Type DescriptionBATT In Power Unregulated power supply for PAGND In Power GroundR5V In Power 5V Power supply200 mA maxA6V5 In Power 6.5V Power supply to front end20mA maxAGND In Power Analogue groundRX_RF Out RF Received RF output after Tx-Rx switch to Receiver front-end.Frequency range: 214 - 234 MHzLO_+10dBm In RF Local oscillator input for receiver50Ω, +10dBm nom.ANT In/Out RF Antenna connector50Ω SMA femaleIRX Out RF Baseband I channel outputLevel 2.5 V pp ±0.1 v pp max.QRX Out RF Baseband Q channel outputLevel 2.5 V pp ±0.1 v pp max.TX_RX In Digital Switches between TX & RX modeRX_GAIN In HCMOS Set RX gain for either maximum sensitivity or large signalhandlingRON In HOS Receiver Enable - used by FET switches on baseband inputsTable 9
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 22 of 275.4 Baseband Module5.4.1 External InterfacesThese signals which originate from or go directly to the Baseband module from any part of the RU(other than the radio RF module) are listed in Table 10.Signal Name Direction Type Connector DescriptionHI_D0 -HI_D15 In/Out Digital H1 pin 1-16 16 bit parallel interface, Host CPU data busTTLHI_C/D In Digital H1 pin 33 Indicates whether host interface contents arecommand or data (host to radio direction only)TTLSee Ref. [8] for levels & timingHI_WSTRB In Digital H1:37 Buffer read/writeTTLSee Ref. [8] for levels & timingHI_RFLAG Out Digital H1:35 Read buffer full flagTTLSee Ref. [8] for levels & timingHI_WFLAG Out Digital H1:36 Write buffer full flagTTLSee Ref. [8] for levels & timingHI_RSTRB In/Out Digital H1:34 Read data strobeTTLSee Ref. [8] for levels & timingWKUPH Out Digital H1:39 Wakeup to Host CPU from Radio systemTTL high: wakeupTTL low: radio card in sleep modeWKUPR In Digital H1:38 Wakeup from Host CPU to Radio systemTTL high: Wakeup radio system from sleepHI_RESET In Digital H1:40 Hardware reset from HostTTL active highREF Out Digital H1:41 2.048 MHz reference locked to master ref.Buffering HCMOSTZERO Out Digital H1:42 T-zeroHCMOS, timing ±20 µsAUD_IN In Analog TBD Audio input0 dBm into 600ΩAUD_OUT Out Analog TBD Audio output0 dBm into 600ΩRP_I+ In/Out Analog H6 pin 2 Repeater I channelAnalog differential line driver !5 VRP_I- In/Out Analog H6 pin 1 Repeater I channelAnalogue Differential line driver !5 VRP_Q+ In/Out Analog H6 pin 5 Repeater Q channelAnalogue differential line driver !5 VContinued overleaf
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 23 of 27RP_Q- In/Out Analog H6 pin 4 Repeater Q channelAnalogue differential line driver !5 VRP_DIR+ In/Out Digital H6 pin 8 Repeater uplink/downlink selectDigital differential line driver !5 VRP_DIR- In/Out Digital H6 pin 7 Repeater uplink/downlink selectDigital differential line driver !5 VRP_MODE In Digital H6 pin 15 Repeater/Normal mode selectHCMOS high: RepeaterHCMOS low: NormalRP_MS In Digital H6 pin 13 Repeater master/slave selectHCMOS high: masterHCMOS low: slaveRP_WKUP+ In/Out Digital H6 pin 10 Wakeup to repeater slaveRP_WKUP- In/Out H6 pin 9 Wakeup to repeater slaveRP_U1+ In/Out H6 pin 12 UnusedDigital differential line driver ±5 VRP_U1- In/Out Digital H6 pin 11 UnusedDigital differential line driver ±5 VRP_GND Out Power H6 pins 14 Ground for repeater linkRP_AGND In Power H6 pin 3 Analogue ground connectionRP_SCRN In Power H6 pin 6 Cable screen connectionPTT In Digital TBD Push-to-talk test connectorTCK In Digital H3 pin 11 JTAG test clockHCMOSTDI In Digital H3 pin 3 JTAG test data inputHCMOSTDO Out Digital H3 pin 7 JTAG test data outputHCMOSTMS In Digital H3 pin 1 JTAG test mode selectHCMOSTRST In Digital H3 pin 2 JTAG test resetHCMOSEMU0 In/Out Digital H3 pin 13 JTAG emulation pin 0HCMOSEMU1 In/Out Digital H3 pin 14 JTAG emulation pin 1HCMOSPD Out Digital H3 pin 5 JTAG presence detectHCMOSTCK_RET Out Digital H3 pin 9 JTAG test clock returnHCMOSRXD Out RS232 H4 pin 2 RS232 Receive DataTXD In RS232 H4 pin 3 RS232 Transmit DataDTR Out RS232 H4 pin 4 RS232 Data Terminal ReadyDSR Out RS232 H4 pin 6 RS232 Data Set ReadyRTS In RS232 H4 pin 7 RS232 Ready To SendCTS Out RS232 H4 pin 8 RS232 Clear To SendBATT In power H1 pin 52,54, 56, 58, 60 +12V nominal battery powerrange 10.8V to 15.6V1.5 A max
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 24 of 27GND In power H1 pin 17, 1831, 32, 43, 44,49, 51, 53, 55,57, 59Battery groundBaseband Module - External Interface SignalsTable 10Table 11 lists the signals which constitute the interfaces between the baseband sub-module and thehost CPU card or PA module.Signal Name Direction Type Connector DescriptionDGND In Power H1 pin 49 Digital groundTZERO Out Digital H1 pin 42 Timing pulse for reception of synch.codeTTL active high2.048MHz Out Digital H1 pin 41 Reference clockTTLHI_D0 -HI_D16 In/Out Digital H1 pin 1- 16 16 bit parallel interface, Host CPUdata busTTLHI_C/D In Digital H1 pin 33 Indicates whether host interfacecontents are command or data (hostto radio direction only)TTL high: commandTTL low: dataHI_RFLAG Out Digital H1 pin 35 Read buffer empty interruptTTL active high:Timing to correspond to C50 interruptrequirementHI_WFLAG Out Digital H1 pin 36 Write buffer full interruptTTL active highTiming to correspond to C50 interruptrequirementHI_WSTRB In Digital H1 pin 37 Data strobeTTLHI_RSTRB In Digital H1 pin 34 Data strobeTTLWKUPHOST Out Digital H1 pin 39 Wakeup to Host CPUTTL high: wakeupHI_RESET In Digital H1 pin 40 Hardware reset from HostTTL active highExternal interface signalsTable 115.4.2 ConnectorsConnectors for the Baseband module are defined in Table 12.
THE BOX - Remote Unit Application for FCC Certification Radio System: Operating ManualAppendix 5 Page 25 of 27Connector Name DescriptionH1 Radio card to Host CPU60 way Molex 53408-1200H2 Connector to RF board60 way Molex 53408-1200JT11JTAG connector14-pin header (two 7-pin rows)Pin-to-pin spacing 0.100 in (X,Y)Pin width: 0.025 in. square postPin length: 0.235 in nominalRS232 connector9-way SM MolexRepeater connector15-way SM MolexAudio ConnectorBaseband Module Connectors5.4.3 Internal Interfaces (Radio System)described in Table 13.ConnectorSource Type RF DescriptionBB PowerDGND BB Digital groundGND Power Battery groundBB PowerPA_ON BB H2 pin 31 Switches power supply to PA (slow)HCMOS low PA offSON HCMOS H2 pin 19RON BB H2 pin 23 Switches power supply to receiver sectionBB HCMOS Switches power to the Cartesian loop sectionTX_RX HCMOS H2 pin 28 HCMOS high: Tx modeHCMOS low: Rx modeBB HCMOS Switches gain in Rx chainHigh = Low gainDC_NULL BB HCMOS H2 pin 32 Causes Cartesian loop to perform DC NULLHCMOS low: DC null activeHCMOS high: Normal loop operation25dB_DOWN BB HCMOS H2 pin 34 For operation see25dB_UP BB HCMOS H2 pin 33 For operation seeContinued overleaf
THE BOX - Remote Unit Application for FCC CertificationAppendix 5 Page 2620dB_ATTA BB H2 pin 35 For operation see20dB_ATTB BB H2 pin 36 For operation seeRF HCMOS Cartesian loop instability detector outputHCMOS high: Loop stablePWR_CNT BB Controls 20dB Tx power controlHCMOS high: 0 dBS_CLK BB H2 pin 22 Synthesizer serial data bit clockBB HCMOS Synthesizer serial dataS_LE HCMOS H2 pin 26PA_EN BB H2 pin 25 PA enable (fast)HCMOS low: PA not enabledT_CLK HCMOS H2 pin 42T_DATA BB H2 pin 41 Temperature sensor dataRF Analog I channel from Rx (to Codec)AC coupled, 2.8 V p-p signalRX_Q RF Analog H2 pin 15 Q channel from Rx (to Codec)AC coupled, 2.8 V p-p signalTX_I BB Analog H2 pin 3 I channel to transmitter (from Codec)AC coupled, 2.8 V p-p signalInput impedance > 10 kΩTX_Q BB Analog H2 pin 7 Q channel to transmitter (from Codec)AC coupled, 2.8 V p-p signalInput impedance > 10 kΩPH_CTL BB Analog H2 pin 20 Cartesian loop phase control0.5-2.5 VRemote Unit Radio Internal Interface SignalsTable 135.4.4 Bi-Directional Host Interface SignalsThese signals are defined in Table 14.Signal Name Direction DescriptionHI_C/D H → R Indicates whether interface contents are command or data (host to radiocommunications only).TTL high: Command informationTTL low: Seismic dataHI_RSTRB H → R Read Data StrobeHigh indicates that Host CPU it has read data from radio.HI_WSTRB H → R Write Data strobeHigh indicates presence of data on interfaceContinued Overleaf
Radio System: Operating ManualAppendix 5 Page of 27HI_WFLAG → H for this buffer to be empty before transferring data to the radio basebandboardTTL low: buffer emptyR →Flag indicating the state of the “to host” buffer. The radio DSP should waitfor this buffer to be empty before transferring data to the host CPU.TTL low: buffer emptyHost Interface Signals

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