Condensed Information Safety and Preparation for Use iii Symbols v Specifications vi Abridged Command List viii Quick Start x Operation Introduction to LORAN-C 1 Signal Characteristics 1 Phase Coding 3 Signal Propagation 3 Blink Transmissions 3 Additional Information 4 LORAN-C Station List 5 FS700 Overview 9 Introduction 9 Antenna 9 Signal Acquisition 9 Locking to LORAN-C 10 Signal Errors 10 Front/Rear Panel Features 11 Front Panel Features 11 Rear Panel Features 12 Front Panel Operation 14 Introduction 14 LORAN Tracking 14 Overview 14 Tracking Menu 15 GRI Selection 15 Station Selection 15 Search Mode 16 Time Constant 16 Keyboard Lock 16 Status Menu 17 Gain, Signal to Noise 17 Phase 17 Stations Found 18 Status Timing 18 Signal Quality 18 Tracking Point Monitoring 18 Notch Filters 19 Tuning the Notch Filters 19 Search Problems 20 Tracking Problems 21 Frequency Generation and Calibration 23 Frequency Menu 23 Phase Menu 23 Time Menu 25 Setup Menu 25 Programming Programming the FS700 27 Communications 27 GPIB Communication 27 Front Panel LED’s 27 Data Window 27 Command Syntax 27 Programming Errors 28 Detailed Command List 28 Tracking Control Commands 28 Tracking Status Commands 30 Phase Meter Commands 31 Status Reporting Commands 33 Hardware Test Commands 34 Status Byte Definitions 35 Status Reporting 35 Serial Poll Status Byte 35 Standard Event Status Byte 35 LORAN Status Byte 36 Programming Examples 37 Microsoft C - Example 1 37 IBM Basic - Example 2 39 Test and Calibration Troubleshooting 41 Self Test Errors 41 GPIB Interface Problems 42 Hardware Troubleshooting 43 16-Bit DAC Test 43 RF Circuitry Test 43 Integrator Test 44 Peak Detector Test 44 Performance Tests 45 Introduction 45 Necessary Equipment 45 Tests 45 Start Tests 45 Front Panel Test 45 RF Bandwidth Test 46 Internal Self-Tests 46 Notch-Filter Check 47 10 MHz Oscillator Check 47 Phasemeter Check 48 FS700 Performance Test Record - Scorecard 49 Calibration 50 Necessary Equipment 50 Coarse Oscillator Adjustment 50 Bandpass Filter Alignment 51 Notch Filter Alignment 53 FS700 Circuitry Circuit Description 55 Front End/ Notch Filters 55 LORAN Front End 55 Microprocessor System 56 I/O Ports and Interrupt Driver 57 Gated Integrators 57 Gated Integrator Pattern RAM 57 A/D, D/A Converters 58 Clocks and Clock Outputs 58 Phase Comparators/Frequency Output 59 Front Panel LED’s/Switches 59 Unregulated Power Supplies 59 Power Supply Regulators 60 Active Antenna 60 FS700 Component Parts List 61 FS710 Amplifier FS710 – 10 MHz AGC Distribution Amplifier Introduction 75 Front Panel - Figure 1 75 Typical Specifications 75 Operation 76 Trouble Shooting 76 Calibration 76 Circuit Description 76 Line Voltage Selection 76 Line Fuse 76 FS710 Component Parts List 77 PC Layout 80 Schematic 81 Component Placement on PCB Schematic Circuit Diagrams Front End/Notch Filters 1/14 LORAN Front End 2/14 Microprocessor System 3/14 I/O Ports and Interrupt Driver 4/14 Gated Integrators 5/14 Gated Integrator Pattern RAM 6/14 A/D, D/A Converters 7/14 Clocks and Clock Outputs 8/14 Phase Comparator/Frequency Output 9/14 Front Panel LED’s/Switches 10/14 Unregulated Power Supplies 11/14 Power Supply Regulators 12/14 Spare IC’s 13/14 Active Antenna 14/14