Page 3-4 GNS 400W Series Installation ManualRev. G 190-00356-083.6 Installation Materials Required but Not Provided3.6.1 Optional Accessories Not Supplied (GNC 420W and GNS 430W Only)The following installation accessories are required but not provided:ITEM REQUIREMENTSCOM Antenna Shall meet TSO C37( ) and C38( ). Broad band, 50 , vertically polarizedwith coaxial cable (GNC 420W and GNS 430W Only)VOR/LOC Antenna Shall meet TSO C40( ) and C36( ). Broad band, 50 , horizontallypolarized with coaxial cable (GNS 430W Only)Glideslope Antenna Shall meet TSO C34( ). Broad band, 50 , horizontally polarized withcoaxial cable or low-loss splitter used with the VOR/LOC antenna(GNS 430W Only)Headphones 500 nominal impedance (GNC 420W and GNS 430W Only)Microphone Low impedance, carbon or dynamic, with transistorized pre-amp(GNC 420W and GNS 430W Only)3.6.2 Materials Required But Not Supplied (New Installations Only)The 400W Series unit is intended for use with the standard aviation accessories. The following items arerequired for installation, but not supplied:Wire (MIL-W-22759/16 or equivalent)Shielded Wire (MIL-C-27500 or equivalent)Mounting Screws (8 minimum – AN577 6-32 screw with 100° countersink)Circuit BreakersTie Wraps or Lacing CordRing Terminals (for grounding)Coaxial Cable (RG-400, RG-142B or equivalent – refer to Section 3.10 for addition information)BNC connectors (such as AMP 225395-6) for the GPS, COM, NAV, and G/S antenna coaxcables.Coax cable connectors for the GPS, COM, NAV, and G/S antennas. See the antenna installationinstructions for appropriate connectors.
