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Garmin GTX 320 ATC manual

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Table of contents for the manual

  • Page 1

    GTX 320 A TC TRANSPONDER MAINTENANCE MANUAL 190-00133-02 (Rev B) GARMIN 1200 E. 151st Street Olathe, KS 66062 USA 16 March 1999 ®[...]

  • Page 2

    190-00133-02 Rev B A ® This publication is the property of GARMIN. It may not be reproduced or transmitted in any form whether printed or electronic, without the expressed written consent of GARMIN International. GARMIN 1200 E. 151st Street Olathe, KS 66062 USA T elephone: 913-397-8200 or 1-800-800-1020 www .garmin.com REVISION RECORD ©Copyright [...]

  • Page 3

    190-00133-02 Rev B i T ABLE OF CONTENTS SECTION 1 DESCRIPTION AND OPERA TION P ARAGRAPH PA G E 1.1 INTRODUCTION ............................................................................................................... 1 -1 1.2 GENERAL DESCRIPTION ................................................................................................ [...]

  • Page 4

    190-00133-02 Rev B 1-1 SECTION 1 DESCRIPTION AND OPERA TION 1.1 INTRODUCTION This manual provides all of the procedures, principles of operation, and information necessary to repair and maintain the GARMIN GTX 320 A TC T ransponder . Refer to GARMIN Installation Manual P/N 190-00133-01 for installation and operating information. 1.2 GENERAL DESCRIP[...]

  • Page 5

    190-00133-02 Rev B 1-2 Figure 1-1. A TCRBS System 1.4 EQUIPMENT DESCRIPTION The GTX 320 consists of two major assemblies, the Main PCB Assembly and the Front Subassembly . 1.4.1 Main PCB Assembly (Not Field Repairable) The Main PCB Assembly contains the following circuits:  IF Amplifier and Pulse Discriminator  Local Oscillator and Mixer  [...]

  • Page 6

    190-00133-02 Rev B 1-3 1.5 SCOPE OF MAINTENANCE Due to the overall complexity of the unit, GARMIN recommends limiting field maintenance to the following:  Removal and Replacement of the Front Subassembly  T ransmitter Frequency Adjustment  T ransmitter Power Output Peaking Adjustment[...]

  • Page 7

    190-00133-02 Rev B 2-1 SECTION 2 SPECIAL TEST EQUIPMENT 2.1 INTRODUCTION This section identifies the special tools and test equipment essential to repair the GTX 320. S tandard equipment is not listed. For any questions regarding special tools and test equipment contact the GARMIN Customer Service Department at the address listed on Page A. 2.2 SPE[...]

  • Page 8

    190-00133-02 Rev B 2-2 2.3.3 Antenna T est Cable Connector The antenna test cable incorporates a BNC connector at the test fixture antenna and a male BNC blindmate connec- tor (GARMIN P/N 330-00198-00) at the transponder . Figure 2-2 shows the connector . Follow accepted industry practices when installing the BNC connector . Use the following[...]

  • Page 9

    190-00133-02 Rev B 2-3 Figure 2-3. T est Setup/T est Harness—J102[...]

  • Page 10

    190-00133-02 Rev B 3-1 SECTION 3 ALIGNMENT AND TESTING 3.1 INTRODUCTION This section of the manual consists of alignment and test procedures. Perform the following procedures to iden- tify failed units (troubleshooting) and after completing any repairs. The procedures assume familiarity with the setup and operation of the special test equipment lis[...]

  • Page 11

    190-00133-02 Rev B 3-2 1. Carefully dislodge the thin metal piece that covers the access holes to the transmitter section (figure 3-1) by prying one end with a small, thin screwdriver . 2. Set the A TC1400A front panel controls to the following: PARAMETER SET POINT XPDR MODE MODE C PRF 500 Hz RF LEVEL -50 dBm SLS / ECHO OFF FREQUENCY/POWER TOGGLE S[...]

  • Page 12

    190-00133-02 Rev B 3-3 Figure 3-1. C620 and C635 Location[...]

  • Page 13

    190-00133-02 Rev B 3-4 CAUTION Do not allow the transmitter to oscillate below 1080 MHz as indicated on the A TC-1400A T est Set or else damage may occur to the mixer . PARAMETER SPECIFIC ATION Frequen c y 1089.0 to 1090.0 MHz XMTR PWR 125 Watts Minimum through a –1.5dB coax Puls e Rise Tim e 50 nS to 100 n S Puls e Fall Time 50 nS t o 200 nS Pul[...]

  • Page 14

    190-00133-02 Rev B 3-5 3.3 TESTING Perform testing after completing transmitter frequency adjustment. 3.3.1 T est Equipment See paragraph 3.2.1. 3.3.2 T est Setup See figure 2-3. 3.3.3 T est Procedure 3.3.3.1 T urn-On Delay NOTE The test setup will not work if any toggle switch on the A TC-1400A is placed in the incorrect position. 1. Configure the[...]

  • Page 15

    190-00133-02 Rev B 3-6 3.3.3.4 Minimum T rigger Level Adjustment (MTL) 1. Set the PRF thumb wheel switches to 500 Hz. 2. Set the A TC -1400A XPDR MODE switch to position A . 3. Reduce the RF level on the A TC -1400A test set until the nominal reply rate is 90%. The RF level (MTL) shall be -69 dBm or less. 4. Set the A TC -1400A XPDR MODE switch to [...]

  • Page 16

    190-00133-02 Rev B 3-7 PARAMETER SPECIFICATION Rise T ime: 50-100 nS Fall T ime: 50-200 nS Pulse Wid th: 350-550 nS Figure 3-2. Example Of Acceptable Reply Pulse 3.3.3.6 Dynamic Range 1. Set the GTX 320 mode select switch to the ON position. 2. Set the A TC 1400A SLS/ECHO thumb wheel switch to -9. 3. Flip the SLS/ECHO toggle switch to the ON positi[...]

  • Page 17

    190-00133-02 Rev B 3-8 3.3.3.8 Side Lobe Suppression 1. Set the SLS / ECHO toggle switch to the OFF position. 2. Adjust the RF level on A TC -1400A to MTL so that the XPDR%REPL Y is 90%. 3. Raise the RF level to 3 dB above the MTL. 4. Set the SLS / ECHO thumb wheel switch to 0dB. 5. Flip the SLS / ECHO toggle switch to the ON position. The GTX 320 [...]

  • Page 18

    190-00133-02 Rev B 3-9 5. Successively turn-on each altitude toggle switch on the test panel. ______ OK 6. Altitude coded pulses shall appear between the P1 and P3 pulses as viewed on the oscilloscope and shown in F igure 3-4. ______ OK 7. V erify that the unit is correctly encoding the altitude by observing the XPDR CODE digital display on the A T[...]

  • Page 19

    190-00133-02 Rev B 3-10 3.3.3.1 1 IDENT T est 1. Set the A TC -1400A to Mode A . 2. T urn the GTX 320 mode select knob to the ON position. 3. Set the RF level on the A TC -1400A for a 100% reply rate. 4. Press the IDENT button on the transponder . The unit shall cause the A TC -1400A XPDR Code display to read 1d0000 for approximately 20 seconds. Th[...]

  • Page 20

    190-00133-02 Rev B 3-11 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”, “AL T” and “TST” nomenclature. All internal power supplies shall be on but the unit shall not reply t[...]

  • Page 21

    190-00133-02 Rev B 3-12 3.3.3.17 Front Panel T est - Reply Light 1. Rotate the Mode Select Switch from TST to AL T and with the unit not replying. Increase the RF level on the A TC-1400A above MTL so that the transponder has a reply rate above 90%. The triangle-shaped reply light shall turn on. ______ OK 2. Rotate and hold the mode select switch in[...]

  • Page 22

    190-00133-02 Rev B 3-13 Figure 3-6. A TC 1400A T est Settings[...]

  • Page 23

    190-00133-02 Rev B 4-1 SECTION 4 DISASSEMBL Y AND REASSEMBL Y 4.1 INTRODUCTION This section covers only the disassembly that is necessary to remove a faulty Front Subassembly . Reverse the steps for assembly . 4.2 INSPECTION Perform the following inspection and cleaning before disassembly: 1. V erify that all screws are secure and in place. 2. V er[...]

  • Page 24

    190-00133-02 Rev B 4-2 Figure 4-1. Front Subassembly Installation 4.4 CLEANING After reassembly , clean the external surface of the transponder when inspection shows dirt, smudges, etc. W ipe with a damp, lint free, static free cloth.[...]