Codan_9105_X-2_serv_1992.pdf

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1、X-2 HF SSB Transceiver Technical service manual 1992, 1993 Codan Pty Ltd. ACN 007 590 605 Order code 15-02047 Issue 2, October 1993 Head OfficeInternational Marketing Offices Codan Pty Ltd 81 Graves Street Newton SOUTH AUSTRALIA 5074 Telephone National08 336 0311 International +61 8 336 0311 Facsimi

2、le08 337 6090 Australia, Pacific and South East Asia Codan Pty Ltd Suite 24, 818 Pittwater Road Dee Why New South Wales AUSTRALIA 2099 Telephone National02 971 2233 International +61 2 971 2233 Facsimile02 982 1117 Telex 22631 Africa, Europe and The Middle East Codan (U.K.) Ltd 6 Grove Park Mill Lan

3、e Alton, Hampshire GU34 2QG UNITED KINGDOM Telephone National0420 80121 International +44 420 80121 Facsimile0420 541098 Telex858355 North and South America Codan Pty Ltd Suite 101 8011 Leslie Road Richmond BC V6X 7E4 CANADA Telephone National604 270 8332 International +1604 270 8332 Facsimile604 27

4、0 4401 Publication No: 15-02047 Table of Contents 1 Introduction.1-1 1.1Purpose.1-1 1.2How this manual is organised.1-1 1.3Conventions.1-2 1.4Related Documents.1-2 1.5Overview.1-2 1.6Specifications.1-3 1.6.1General Specifications.1-3 1.6.2Receiver Specifications.1-5 1.6.3Transmitter Specifications.1

5、-6 2 Brief Description.2-1 2.1General.2-1 2.2Control and Switching.2-2 2.3Synthesiser.2-2 2.4Receive Path.2-3 2.5Transmit Path.2-4 3 Operating Instructions.3-1 4 Technical Description.4-1 4.1Control and Supply Voltages.4-2 4.1.1Power.4-2 4.1.2Supply Voltages .4-2 4.1.3Receive/Transmit Switching.4-3

6、4.2Receiver.4-4 4.2.1Input Filters.4-4 4.2.2First Mixer.4-4 4.2.345 MHz Roofing Filter.4-4 4.2.4Second Mixer.4-4 4.2.5Noise Limiter.4-5 4.2.6455 kHz Filter and IF Amplifier.4-5 4.2.7Automatic Gain Control.4-6 4.2.8Mute.4-7 4.2.9Volume Control and Audio Amplifier .4-8 ii Table of ContentsX-2 Technica

7、l Service Manual Publication No: 15-02047 4.3Transmitter Exciter .4-8 4.3.1Microphone Compressor.4-8 4.3.2Modulator .4-9 4.3.3455 kHz Filter and First Mixer.4-9 4.3.445 MHz Roofing Filter.4-9 4.3.5Second Mixer and Exciter Output Filter.4-9 4.4Local Oscillators.4-10 4.4.1Introduction.4-10 4.4.2VCO1 a

8、nd PLL .4-10 4.4.3VCO2 and PLL .4-11 4.4.4455 kHz Local Oscillator.4-12 4.4.5Clarifier.4-12 4.5Micro and Peripherals .4-13 4.5.1Microcontroller.4-13 4.5.2I2C Bus .4-13 4.5.3PA Control Bus.4-13 4.5.4Front Panel Controls.4-14 4.5.5Tune.4-15 4.5.6Tone Generation.4-15 4.5.7A/D Inputs.4-15 4.5.8Microcont

9、roller Reset.4-16 4.6PA and Filters.4-16 4.6.1Gain Control Stage.4-17 4.6.2Predriver Stages .4-17 4.6.3Driver Stage.4-17 4.6.4Output Stage and Bias Regulator.4-18 4.6.5Output Filters and Antenna 1 and 2 Select .4-18 4.6.6ALC Control .4-18 5 Maintenance.5-1 5.1Introduction.5-1 5.2General.5-1 5.2.1CMO

10、S Devices.5-1 5.2.2Circuit Boards.5-2 5.2.3Transmitter Precautions.5-3 5.2.4Probe Precautions.5-4 5.3Fault Diagnosis .5-4 5.3.1General.5-4 5.3.2Voltage measurements.5-5 5.3.3No Reception .5-6 X-2 Technical Service Manualiii Publication No: 15-02047 5.3.4Transmitter Failure .5-7 5.3.5Unlocked Synthes

11、iser.5-7 5.3.6PA Failure.5-8 5.4Dismantling and Assembling.5-8 5.4.1.General.5-8 5.4.2Top and Bottom Covers .5-9 5.4.3Rx/Exciter Carrier wave DDiode - small signal and power DCDirect current EHeating devide EEPROMElectrically erasable/programmable read-only memory EMFElectromotive force EmgcyEmergen

12、cy FETField-effect transistor FWD-PWRForward Power HSignalling/indicating device; Lamp; Buzzer HFHigh Frequency I/OInput/Output I2CInter IC Communication ICIntegrated Circuit IMDIntermodulation distortion IFIntermediate Frequency JJack Socket KRelay; Key Switch LInductor LEDLight Emitting Diode LSBL

13、ower Side Band MICMicrophone NANDNot AND logic O/POutput ORLogical OR function NORNegative OR function PPlug PAPower amplifier PA/OPPower amplifier/Output PCPersonal computer PCBPrinted circuit board PDPotential difference PEPPeak envelope power PLLPhase-locked loop ppmParts per million PTCPositive

14、temperature coefficient (Resistor) 8-8 AppendicesX-2 Technical Service Manual Publication No: 15-02047 Abbreviations (contd) AbbreviationMeaning PTTPush-to-talk PWRPower QQuality factor RResistor RAMRandom Access Memory REF-PWRReference-Power RFRadio frequency RFDSRoyal Flying Doctor Service RMSRoot

15、 mean square ROMRead Only Memory RxReceive; Receiver SSwitch SCFSuppressed carrier frequency SINADSignal + Noise + Distortion-to-Noise + Distortion Ratio SOTSelect on test SSBSingle Side Band TTransformer TCWTinned copper wire TPTest point TxTransmit; Transmitter UHFUltra High Frequency USBUpper Sid

16、e Band VCOVoltage-controlled oscillator VSWRVoltage standing wave ratio ZQuartz Crystal; Crystal Filter; Frequency Network Table D.1 Abbreviations. D.2Units AbbreviationUnitAbbreviationUnit Aamperemmetre CCelsius (degrees)minminute CcoulombNNewton dBdecibelsPaPascal FfaradSSiemens ggramssecond hhour

17、TTelsa HhenryVvolt HzHertzWbweber JjouleWwatt KKelvinohm llitre Table D.2 Abbreviations of Units. X-2 Technical Service ManualAppendices 8-9 D.3Unit Multiples AbbreviationPrefixNumericMeaning Ttera1012one million million Ggiga109one thousand million Mmega106one million kkilo103one thousand hhecto102

18、one hundred dadeca10ten ddeci10-1one tenth ccenti10-2one hundreth mmilli10-3one thousandth micro10-6one millionth nnano10-9one thousand millionth ppico10-12one million millionth Table D.3 Abbreviations of Unit Multiples. ? HF SSB Transceiver X2 Technical Service Manual12-50093 Issue 1, Page 1 Addend

19、um The following section is added to the HF SSB Transceiver X2 Technical Service Manual, Codan part number 15-02047 Issue 2, December 1993. This addendum provides information on changes to the Crystal Oven. The Crystal Oven information is provided in addition to that existing in Chapter 4, Local Osc

20、illators. It describes how the oven maintains a constant temperature. Drawings associated with the crystal oven information are: Crystal Oven Circuit Diagram04-03095 Crystal Oven Final Assembly08-05235 The corresponding parts list is: Crystal Oven Parts List 08-05235-001 Addendum Page 2, 12-50093 Is

21、sue 1HF SSB Transceiver X2 Technical Service Manual Local Oscillators Introduction Each synthesizer is locked to the reference oscillator. This consists of a 7.304 MHz crystal (Z3) held at a constant temperature by an oven, which is one of the following: a PTC thermistor (E1) at 60C a high stability

22、 oven where the R3 NTC (Negative Temperature Coefficient) resistor measures the temperature of the crystal and causes the op-amp comparator IC1 to vary the current in the heating element V2 to maintain the temperature of 65oC to within 1C The temperature of the high stability oven is set by R4. V1, R12 and R13 limit the maximum current through V2 to approximately 400 mA.