CalAmp Wireless Networks GPDA Gemini/PD User Manual service manual preliminary version

CALAMP WIRELESS NETWORKS INC. Gemini/PD service manual preliminary version

service manual preliminary version

Gemini / PDMobile Radio ModemService Manualversion 0.03PRELIMINARYThe entire contents of this manual and the Radio Service Softwaredescribed in this manual are copyright 1998 by DATARADIO Inc.Copyright DATARADIO Inc.November 1998part no.: 120 1020110-003
iTable of Contents1. PRODUCT OVERVIEW................................................................................................................................... 11.1 INTENDED AUDIENCE ....................................................................................................................................... 11.2 GENERAL DESCRIPTION .................................................................................................................................... 11.3 CONFIGURATION ............................................................................................................................................... 11.4 FACTORY TECHNICAL SUPPORT........................................................................................................................ 21.5 PRODUCT WARRANTY ...................................................................................................................................... 21.6 REPLACEMENT PARTS....................................................................................................................................... 21.6.1 Factory Repair........................................................................................................................................ 22. OPERATION...................................................................................................................................................... 22.1 FRONT & REAR PANELS ................................................................................................................................... 22.1.1 LED Indicators........................................................................................................................................ 32.2 DTE PORT INTERFACE ..................................................................................................................................... 32.2.1 RS-232 Interface Signal Levels............................................................................................................... 33. ADJUSTMENTS AND MAINTENANCE....................................................................................................... 43.1 OVERVIEW........................................................................................................................................................ 43.1 INTENDED AUDIENCE ....................................................................................................................................... 43.2 EQUIPMENT REQUIRED ..................................................................................................................................... 43.3 MAINTENANCE INTERVALS............................................................................................................................... 43.4 TESTS & ADJUSTMENTS ................................................................................................................................... 43.4.1 Preliminary Verification ......................................................................................................................... 43.4.2 Basic Tests & adjustments....................................................................................................................... 43.4.3 Tests & adjustments Procedure............................................................................................................... 43.4.4 Opening the Unit..................................................................................................................................... 63.4.5 GPS Diagnostics Procedure.................................................................................................................... 74. SPECIFICATIONS............................................................................................................................................ 8
iiWhat's New in Version 0.02GPS Diagnostics procedureHistoryVersion 0.1: First preliminary versionVersion 0.2:• Unit specification revised• Typo correction
iii Definitions The following terms are used throughout this document. Item Definition DCE Data Communications Equipment. This designation defines the direction (inputor output) of the various RS-232C interface signals. Modems are always wired asDCE. See also DTE. DTE Data Terminal Equipment. This designation defines the direction (input or out-put) of the various RS-232C interface signals. Most user equipment, as well asPCs, are wired as DTE. See also DCE. GCU Gemini Control Unit board Gemini/PD High specs mobile radio modem. PD = Parallel decode HDX Half Duplex. A unit which uses separate transmit and receive frequencies, butwhich may not transmit and receive simultaneously. RS-232 Industry–standard interface for low speed data transfer (EIA-RS-232E).RSS Radio Service Software. This software allows configuration and testing of theGemini/PD. Simplex A unit which uses the same frequency for transmit and receive.
120 20110-003 PRELIMINARY Gemini/PD Technical Manual11. PRODUCT OVERVIEWThis document provides the informationrequired for the operation and maintenanceof the DATARADIO Gemini/PD mobile radio-modem.1.1 Intended AudienceThis document is designed for use by engi-neering design, installation, and mainte-nance personnel.1.2 General DescriptionGemini/PD is a mobile radio-modem aimedat the public safety and public utility marketsto meet demand for high speed and highthroughput. It integrates all the necessaryhardware for data-only vehicular installationsup to but not including the laptop PC and itsapplication software. Example ofapplications are:1. Database inquiry systems.Small number of brief messages, (usu-ally from the mobile station) with fairlylong responses.2. Computer-aided dispatch (CAD).Large number of messages, (usuallyfrom the base station) with very briefresponses.3. Automatic Vehicle Location (AVL).Using a GPS receiver, determines posi-tion, speed and direction of fleet mem-bers.The Gemini/PD is made-up of a maintransceiver and a auxiliary receiver forParallel Decode (PD), a 40 Watt poweramplifier, a Gemini Control Unit (GCU) withDSP driven modem and an integrated OEMGPS receiver.Features:• Rugged water-proof die-cast aluminumchassis.• Data speeds of 9600 to 19200 b/s(9600 b/s maximum in half channels)• 3 available user ports using standardRS-232 interface• Built–in 16-channel synthesized radiotransceiver.• Power output of 10W to 40W (softwarecontrolled).• Half duplex or simplex operation.1.3 ConfigurationOperating characteristics of the Gemini/PDare configured by Dataradio SystemEngineering for communication protocolsand network settings.A Radio Service Software (RSS) is providedfor radio/modem maintenance, adjustmentsand frequency programming. The RSS isMSDOS based and will run on any 486 orhigher PC (2 Megabytes memory required).WARNING: The frequency band 406 to406.1 MHz is reserved for use by distressbeacons and cannot not be programmed intothe unit.
120 20110-003 PRELIMINARY Gemini/PD Technical Manual21.4 Factory TechnicalSupport The Technical Support departments ofDATARADIO provide customer assistance ontechnical problems and serve as an interfacewith factory repair facilities. They can bereached in the following ways: DATARADIO Inc. 5500 Royalmount Ave, suite 200 Town of Mount Royal Quebec, Canada H4P 1H7 Technical support hours: Monday to Friday9:00 AM to 5:00 PM, Eastern Time phone: +1 514 737-0020 fax: +1 514 737-7883 or DATARADIO Corp. 6160 Peachtree Dunwoody RD., suite C-200 Atlanta, Georgia 30328 Technical support hours: Monday to Friday9:00 AM to 5:00 PM, Eastern Time phone: 1 770 392-0002 fax: 1 770 392-9199orEmail address: support@dataradio.com 1.5 Product Warranty Warranty information may be obtained bycontacting your sales representative.1.6 Replacement Parts This product is normally not field service-able, except by the replacement of completeunits. Specialized equipment and training isrequired to repair the GCU board and radiomodules. Contact Technical Support for service in-formation before returning equipment. ATechnical Support representative may sug-gest a solution eliminating the need to returnequipment.1.6.1 Factory Repair When returning equipment for repair, youmust request an RMA (Returned MaterialAuthorization) number. The Tech Supportrepresentative will ask you several questionsto clearly identify the problem. Please givethe representative the name of a contact per-son who is familiar with the problem,should questions arise during servicing ofthe unit. Customers are responsible for shippingcharges for returned units. Units in warrantywill be repaired free of charge unless thereis evidence of abuse or damage beyond theterms of the warranty. Units out of warrantywill be subject to service charges. Informa-tion about these charges is available fromTechnical Support.2. Operation2.1 Front & Rear PanelsThe front panel includes:• One mini-UHF type female antennaconnector for the auxiliary receiver• One SMA type female connector for theGPS receiver• Two LED indicators• Three DE-9F RS232 portsThe rear panel includes:• One mini-UHF type female antennaconnector for the main transceiver• One 3-pin pigtailed power connectorwith ignition sense
120 20110-003 PRELIMINARY Gemini/PD Technical Manual32.1.1 LED IndicatorsThe Gemini/PD has two LED indicators:LED’sname Indicates DescriptionPWR red DC Power is appliedred Unit transmitRX/TX green Unit receiveflashingred/green Radio is unlocked2.2 DTE Port InterfaceFor all three ports:DE-9 Fpin # Function1 DCD – from Gemini/PD, normallyasserted2 RXD – data from Gemini/PD3 TXD – data to Gemini/PD4 DTR – to Gemini/PD, handshaking5 Ground6 DSR – from Gemini/PD, tied toVCC through current limiting resis-tor7 RTS - to Gemini/PD, handshaking8 CTS – from Gemini/PD, hand-shaking9 AUX auxiliary input to Gemini/PD,“panic line” input (port 3):It may be activated by dry contactpull-up to the port’s DSR output. Itmay also tolerate user pull-up toexternal +12 VDC (car battery), butan isolated dry contact is preferreddue to the risk of noise related falsealarms caused by the vehicle’selectrical system.We recommend the use of a shielded 9-wirecable with all pins connected. These portscan be used for unit configuration, mainte-nance & adjustment as well to connect userapplications.2.2.1 RS-232 Interface SignalLevelsIn the descriptions of data signals, the fol-lowing conventions are used:Table 1 - RS-232 Signal LevelsTerm Alternates Signal levelON asserted, spacing +3 to +15 VOFF dropped, marking -3 to -15 V
120 20110-003 PRELIMINARY Gemini/PD Technical Manual43. Adjustments andMaintenance1.1 OverviewThis chapter outlines the basic adjustment pro-cedures required upon initial installation andthereafter at prescribed maintenance intervals.Units are delivered from the factory properlyaligned and tested on the frequencies specifiedat time of order. Adjustment beyond that de-scribed in this chapter is not required unless ra-dio modules have been tampered with or re-paired. In such cases we recommend completefactory re-alignment as special test jigs are re-quired.3.1 Intended AudienceThis chapter is intended for use by installationand maintenance personnel.3.2 Equipment RequiredThe adjustments described below require thefollowing equipment:• 13.6 VDC (nominal), 20A regulated powersupply.• Radio service monitor (IFR or equivalent).• Cable with mini-UHF male connector toconnect Gemini/PD to the service monitor.• Gemini Radio Service Software,• A 486 PC (or better) to run the RSS.• Normal radio shop tools.3.3 Maintenance IntervalsThe adjustments described below should bedone at annual intervals or whenever a deterio-ration in performance indicates that adjustmentmay be required.3.4 Tests & Adjustments3.4.1 Preliminary VerificationBefore performing any adjustment, verify the per-formance of the unit as shown in the Table 1.Important note: Before proceeding make sure thatthe service monitor has been calibrated recently andhas warmed up for at least the time specified by itsmanufacturer.Some reported frequency and deviation problemshave actually been erroneous indications from serv-ice monitors that have not adequately warmed up.This is particularly likely when field service is doneduring winter months.3.4.2 Basic Tests & adjustmentsRecommended Tests:1. TX power output2. Carrier frequency error3. Frequency deviationNote: Only if a loss in system performance hasbeen detected, RX SINAD and RX audiodistortion should be verified.Adjustments:1. Transmitter power output2. Frequency error3. Transmitter deviation3.4.3 Tests & adjustments Proce-dureRefer to the RSS help file for details &parameter information.1. Connect the Gemini/PD main antenna con-nector (or the auxiliary receiver) to theTX/RX input of the service monitor using asuitable length of 50 ohm cable.2. Connect the Gemini/PD to a suitable powersupply and adjust the supply voltage to 13.6volts.3. Using a suitable 9 conductor straight RS-232 cable, connect the Gemini port 1 to theRS-232 port of a PC and run the GeminiRSS program.4. Press GET to get the configuration of theunit.5. Refer to “Tests and Adjustments” table.
120 20110-003 PRELIMINARY Gemini/PD Technical Manual5Table 1: Tests and Adjustments Full & Half ChannelUnitsSTEP ACTION EXPECTEDRESULTS at25°°°°CMEASUREWITH IF NOT?1Output PowerPress PTT Channel xUHF: 40 watts 1+10%, -20%Service monitorset to read power Check the RSS maximum poweroutput setting: must be set to 255(means 40W). User can howeverreduced it down to 10 Watts.Refer to factory tech support.2Frequency ErrorPress PTT Channel x±300 Hz Service monitorset to read fre-quency errorAdjust using the RSS Freq Warpsetting (fine tuning adjust)(Typical adjust range is ±1.5KHz)If found outside limits, user isto call factory technical sup-port.3DeviationPress PTT Channel xCarrier will be modulatedwith a 1 KHz tone.For any bit ratespeeds selected:Full channel unit±4.0 kHz+5%, -10%Half channel unit±2.5 kHz+5%, -10%Service monitorset to readdeviationUsing RSS, adjust TX deviation.4 Set the service monitor to generate a –80 dBm signal on the selected receive frequency. The signal shouldbe modulated with a 1.0 kHz tone. Open the top cover to access the radio (see 3.4.4)To be performed only if a loss in system performance has been detected512 dB SINAD• For Full channel unit, setdeviation to ±3 kHz.• For Half channel unit, setdeviation to ±1.5 KHz• Set service monitor IFfilter to mid (15-30 kHz),no audio filter.Measure taken atJ400 pin 21 (RX1)and at pin 23(RX2)≤ 0.5 µV 2Service monitorset for SINAD.Connect to radioconnector J400pin 21 (RX1) orpin 23 (RX2).Refer to factory technical support.6DistortionUse same settings as per 12dB SINAD < 3%Same as perStep 5 Refer to factory technical support.1 (unless you have set a lower value). Note that readings less than 40 watts may be due to losses in cables used for testing.Check also your wattmeter frequency calibration curve. Do not be too ready to condemn the transmitter.2 If a psophometrically weighted filter is available on the service monitor, use 0.35 µV.
120 20110-003 PRELIMINARY Gemini/PD Technical Manual63.4.4 Opening the Unit1. Remove the two Philips screw from the unit top cover.2. Remove the top cover by lifting it from the rear.3. Slide the cover out of the case.242321J40013.6Vdc Power connectorMain Antenna connectorAux. Receiver Antenna connectorGPS Receiver antenna connectorFigure 1 Gemini/PD Top view (cover removed)RS232 com ports
120 20110-003 PRELIMINARY Gemini/PD Technical Manual73.4.5 GPS Diagnostics ProcedureOVERVIEWThe detection of the POSition message shows a GPS CONNECTED LED. After about threeminutes, detection of the one Pulse Per Second (PPS) should flash the POSITION ACQUIREDindicator, this means that the GPS has a position solution.If the GPS has a good view of the sky and still has not generated any position solution withinthree minutes (it may take up to 10 minutes or more if the sky view is partially blocked.) thefollowing trouble-shooting procedures should be undertaken to isolate the fault:1) Disconnect the GPS antenna cable connector from the Gemini radio and check for + 5 VDCon the center pin of the GPS antenna connector on the radio using a DVM. If the voltage ispresent, do not reconnect the cable and proceed to step 2.2) With the DVM, measure resistance between the shell and the center conductor of the GPS ca-ble, resistance should be between 100 and 300 Ohms, if it measures open or short circuit theGPS antenna is either a passive antenna which is the WRONG type, or a defective active an-tenna, replace with a known good active antenna.3) Connect the new antenna to Gemini and wait about three minutes for the POSITIONACQUIRED indicator to start flashing on Gemini, if not, the Gemini radio or its GPS receiveris defective.
120 20110-003 PRELIMINARY Gemini/PD Technical Manual84. SpecificationsGENERALUHFFrequency 400 - 512 MHz1Channel spacing 12.5, 20 or 25 kHzFrequency Control Digital Synthesizer / uControllerFrequency Stability 1.5 ppmOperating temperature -30°C to +60°C (25°C nominal) @ 95% non-cond. RHModes of Operation Simplex or Half DuplexNumber of channels 16 internally storedSupply voltage 13.6Vdc nominal (negative ground)10.9 – 16.3 VDCCircuit Protection 15 Amp fuse external2 & 4 Amp fuse internalRX Current at 13.6 VDC < 550 mA Standby (with auxiliary receiver)TX Current at 13.6 VDC < 15 ATX/RX separation 5 MHz typicalNominal Dimensions 7.050” D x 6.000” W x 2.0000” HWeight: < 3.5 lbs.RF input/output Impedance 50 ohms nominalRF connector Main TX/RX: mini-UHF femaleAuxiliary RX: mini-UHF femaleGPS RX: SMA femaleInterface connector 3x DE-9F D-subminiatureRECEIVERUHFSensitivity (12 dB SINAD) < 0.35 µV *Selectivity (25KHz) 75 dB typical70 dB minimumSelectivity (12.5) 65 dB typical60 dB minimumIntermodulation 75 dB typical70 dB minimumSpurious rejection 75 dB typical70 dB minimumFM hum & noise -45 dB typical *Conducted spurious < -57 dBm* psophometrically weighted filter 1 WARNING: The frequency band 406 to 406.1 MHz is reserved for use by distress beaconsand should not be programmed into the unit.
120 20110-003 PRELIMINARY Gemini/PD Technical Manual9TRANSMITTERUHFPower output 10-40 wattsDuty cycle 20% @ full power, 30 seconds maximum transmit timeConducted Spurious -75 dBc (-38 dBm @10 W) typicalFrequency stability 1.5 ppmFM hum and noise -45 dB max (25 kHz)Attack time < 10 msMODEM OPERATIONInterface EIA RS-232COperation Simplex/half duplexData rates 4800 b/s 9600 b/s 19200 b/sModulation type DRCMSK DRCMSK DRCMSKPacket Error Rate(for < 1% error)better than –110 dBm at 9600 b/s half channelbetter than –115 dBm at 9600 b/s full channelbetter than –112 dBm at 16000 b/s full channelbetter than –109 dBm at 19200 b/s full channelProtocol Dataradio ProprietaryDISPLAY and CONTROLS2 status LEDs RX/TX, PWRFCC / ICCERTIFICATIONSFCC IC (DOC)VHFUHF900 MHz
120 10503-201 ii T-96S Technical Manual

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