Garmin GTX 320 ATC Maintenance Manual
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Garmin GTX 320 ATC Maintenance Manual

Atc transponder
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Summary of Contents for Garmin GTX 320 ATC

  • Page 1 ®...
  • Page 2 ® ©Copyright 1999, by GARMIN Corporation. All rights reserved.

  • Page 3: Table Of Contents

    PARAGRAPH 1.1 INTRODUCTION ... 1-1 1.2 GENERAL DESCRIPTION ... 1-1 1.3 TECHNICAL SPECIFICATIONS ... 1-1 1-4 EQUIPMENT DESCRIPTION ... 1-2 1-5 SCOPE OF MAINTENANCE ... 1-3 2.1 INTRODUCTION ... 2-1 2.2 SPECIAL TOOLS AND TEST EQUIPMENT ... 2-1 3.1 INTRODUCTION ... 3-1 3.2 ALIGNMENT ...

  • Page 4: Introduction

    SECTION 1 DESCRIPTION AND OPERATION 1.1 INTRODUCTION 1.2 GENERAL DESCRIPTION 1.3 TECHNICAL SPECIFICATIONS...

  • Page 5: Equipment Description

    Figure 1-1. ATCRBS System 1.4 EQUIPMENT DESCRIPTION 1.4.1 Main PCB Assembly (Not Field Repairable) 1.4.2 Front Subassembly (Field Replaceable)

  • Page 6: Scope Of Maintenance

    SCOPE OF MAINTENANCE...

  • Page 7: Special Test Equipment

    SECTION 2 SPECIAL TEST EQUIPMENT 2.1 INTRODUCTION 2.2 SPECIAL TOOLS AND TEST EQUIPMENT 2.3.1 Test Panel and Test Harness 2.3.2 Alignment Tool Figure 2-1. Alignment Tool...
  • Page 8 2.3.3 Antenna Test Cable Connector NOTE NOTE Figure 2-2. Blindmate Antenna Connector...
  • Page 9 Figure 2-3. Test Setup/Test Harness—J102...

  • Page 10: Alignment And Testing

    SECTION 3 ALIGNMENT AND TESTING INTRODUCTION 3.2 ALIGNMENT 3.2.1 Alignment Equipment 3.2.2 Alignment Setup 3.2.3 Alignment Procedure CAUTION...
  • Page 11 PARAMETER XPDR MODE RF LEVEL SLS / ECHO FREQUENCY/POWER TOGGLE SWITCH NOTE SET POINT MODE C 500 Hz -50 dBm...
  • Page 12 Figure 3-1. C620 and C635 Location...
  • Page 13 CAUTION PARAMETER SPECIFICATION Frequency 1089.0 to 1090.0 MHz XMTR PWR 125 Watts Minimum through a –1.5dB coax Pulse Rise Time 50 nS to 100 nS Pulse Fall Time 50 nS to 200 nS Pulse Width 350 nS to 550 nS...

  • Page 14: Testing

    3.3 TESTING 3.3.1 Test Equipment 3.3.2 Test Setup 3.3.3 Test Procedure 3.3.3.1 Turn-On Delay NOTE 3.3.3.2 Reply Transmission Frequency 3.3.3.3 Transmitter Power Output...
  • Page 15 3.3.3.4 Minimum Trigger Level Adjustment (MTL) 3.3.3.5 Reply Pulse Characteristics EXT TRIG CH 2 VERTICAL SENS HORIZONTAL SWEEP DELAYED SWEEP XPDR MODE RF LEVEL SLS / ECHO FREQUENCY/POWER TOGGLE SWITCH PARAMETER SET POINT CH 2 (XMTR Detected Video) 20mV/Div 100ns CENTER ON FIRST PULSE PARAMETER MODE C...
  • Page 16 PARAMETER Rise Time: Fall Time: Pulse Width: Figure 3-2. Example Of Acceptable Reply Pulse 3.3.3.6 Dynamic Range 3.3.3.7 Automatic Overload Control (AOC) SPECIFICATION 50-100 nS 50-200 nS 350-550 nS...
  • Page 17 3.3.3.8 Side Lobe Suppression 3.3.3.9 External Suppression 3.3.3.10 External Altittude Encoder Inputs EXT TRIG CH 2 VERTICAL SENS HORIZONTAL SWEEP DELAYED SWEEP PARAMETER SET POINT CH 2 (XMTR Detected Video) 20MV/DIV 5µS CENTER ON FIRST PULSE...
  • Page 18 Figure 3-3. P1 and P3 Pulses Figure 3-4. Altitude-Coded Pulses...
  • Page 19 3.3.3.11 IDENT Test Figure 3-5. P1, P3, and SPI Pulses 3.3.3.12 Front Panel Test - OFF...
  • Page 20 3.3.3.13 SBY (Stand By) Set the transponder mode select switch to the SBY position. The “SBY” nomenclature and the four reply code digits shall be illuminated with a higher intensity than the “OFF”, “ON”, “ALT” and “TST” nomenclature. All internal power supplies shall be on but the unit shall not reply to any interrogations. 3.3.3.14 Set the transponder mode select switch to the ON position.
  • Page 21 3.3.3.17 Front Panel Test - Reply Light 1. Rotate the Mode Select Switch from TST to ALT and with the unit not replying. Increase the RF level on the ATC-1400A above MTL so that the transponder has a reply rate above 90%. The triangle-shaped reply light shall turn on.
  • Page 22 Figure 3-6. ATC 1400A Test Settings...

  • Page 23: Disassembly And Reassembly

    DISASSEMBLY AND REASSEMBLY INTRODUCTION 4.2 INSPECTION FRONT SUBASSEMBLY (P/N 011-00263-00) SECTION 4 CAUTION...

  • Page 24: Cleaning

    Figure 4-1. Front Subassembly Installation 4.4 CLEANING...

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Gtx 320

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