190-01115-01 G3X/G3X Touch Installation Manual - GTR 20 InstallationRev. AC Page 21-121 GTR 20 (VHF COMMUNICATIONS RADIO) INSTALLATIONThis section contains general information as well as installation information for the GTR 20. Use thissection to mount the GTR 20 unit. Careful planning and consideration of the suggestions in this section arerequired to achieve the desired performance and reliability from the GTR 20. The guidance of FAAadvisory circulars AC 43.13-1B and AC 43.13-2B, where applicable, may be found useful for makingretro-fit installations that comply with FAA regulations.NOTEA GTR 20 cannot be installed in a system that also includes a GDU 37X. The GTR 20 willonly work with the G3X system that uses the new GDU460 and GDU465 displays. TheGTR 20 is not supported with G3X installations using GDU37X displays.Figure 21-1 GTR 20 Unit View (shown with mounting brackets on ends)21.1 Equipment DescriptionThe GTR 20 is a transceiver that operates in the 118.000 to 136.975 MHz frequency range. The receiversensitivity SINAD is greater than 6dB when the RF level is -107 dBm with 30% modulation. Thetransmitter power is 10 W carrier minimum.Table 21-1 Available UnitsModel Part Number TX Power (Watt) 8.33 KHz Spacing 25 KHz SpacingGTR 20 011-03007-00 10 N/A Yes
