Garmin GDL 82 Installation Manual

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Garmin GDL 82 Installation Manual Manual pdf 43 page image

Installation Procedures190-01810-00 GDL 82 TSO Installation ManualRev. 5 Page 6-66.2 Coaxial Cable InstallationNOTEDue to cable loss requirements, older coaxial cable may need to be replaced, i.e., RG-58. Refer tosection 4.2 for additional details.Any standard 50 ohm, double shielded coaxial cable that meets the attenuation requirements with connectors can beused, depending on the installation configuration and cable length.1. Route the transponder coaxial cable to the GDL 82 location.2. Secure the cable.3. Trim the coaxial cable to the desired length.4. Install the TNC or BNC connectors per the manufacturer’s instructions.5. Ensure the coaxial line to the transponder is connected to the XPDR port and the antenna coaxial line to the ANTport.Table 6-1 Coaxial Cable Specifications[1] RG type coaxial cable insertion loss can change significantly between manufacturers. The insertion loss forRG type cables shown is considered the worst case scenario. Refer to the cable manufacturer’s specificationsheet for the actual cable attenuation (insertion loss).[2] Supplier information (for reference only):Carlisle IT:5300 W. Franklin Drive Franklin, WI 53132Tel: 800-327-9473www.carlisle.com[3] RG types are obsolete, reference only, and replaced by M17 type numbers.Cables are shown for reference only. Any standard 50 ohm, double-shielded coaxial cable assembly that meets theattenuation (with connectors) and airworthiness requirements can be used. A loss of 0.2 dB can be used for eachconnection when calculating cable loss. Cables that meet the specifications in table 6-1 are satisfactory for GDL 82installations.INSERTION LOSS(DB/100FT) [1] CARLISLE IT [2] MIL-C-17 RG [3]18.5 N/A M17/128-RG400 RG-40011.1 N/A M17/112-RG304 RG-3049.2 N/A M17/127-RG393 RG-39315.2 3C142B N/A N/A9.2 311601 N/A N/A7.5 311501 N/A N/A5.8 311201 N/A N/A3.8 310801 N/A N/A