Garmin GDL 82 Installation Manual

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GDL 82 Mooney M20( ) Series STC Installation Manual 190-01810-10Rev. 1Page 13 of 49Table 3-3: Coaxial Cable SpecificationsInsertion Loss(dB/100ft) [1] Carlisle IT Type [2] MIL-C-17 Type RG Type [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[1] RG Type coaxial cable insertion loss can changed significantly between manufacturers. Theinsertion loss for RG Type cables shown in this column is considered the worst case scenario. Referto the cable manufacturers’ specifications for actual attenuation (insertion loss) for the cable beingused.[2] Supplier information (for reference only);Carlisle Interconnect Technologies5300 W. Franklin Drive, Franklin WI 53132TEL: 800-327-9473www.carlisleit.com/[3] RG Types are obsolete and are shown for reference only; replaced by M17 Type numbers.Table 3-4: Typical Cable Connector LossConnector Type Approximate dB LossTNC 0.08 dBBNC 0.20 dBC 0.15 dBN 0.05 dB3.4.1 Transponder AntennaThe existing transponder L-Band antenna and/or the antenna coaxial cables do NOT require changes ifthe antenna meets the following requirements and the existing transponder system passes the pre-installation check specified in Section 3.3. The existing transponder antenna must be:1. TSO-C74(), C112(), or C166().2. 50 ohm vertically polarized with a VSWR ≤ 1.7:1 at 978 MHz, and ≤ 1.5:1 at 1090 MHz.3. Installed on a ground plane that is electrically bonded to the airframe ground with a direct current(DC) resistance less than or equal to 2.5 milliohms with connector disconnected.Additionally, the antenna location is:1. Away from major protrusions.2. As far away as practical from landing gear doors, access doors, or other openings that can affectits radiation pattern.3. At least 20 inches from any other transponder, TAS/TCAS, DME or 1030/1090 MHz antenna.