Section 19 Gtr 20 (Vhf Communications Radio) Installation; Equipment Description - Garmin G3X Installation Manual

19 GTR 20 (VHF COMMUNICATIONS RADIO) INSTALLATION
This section contains general information as well as installation information for the GTR 20. Use this
section to mount the GTR 20 unit. Careful planning and consideration of the suggestions in this section are
required to achieve the desired performance and reliability from the GTR 20. The guidance of FAA
advisory circulars AC 43.13-1B and AC 43.13-2B, where applicable, may be found useful for making
retro-fit installations that comply with FAA regulations.
NOTE
A GTR 20 cannot be installed in a system that also includes a GDU 37X. The GTR 20 will
only work with the G3X system that uses the new GDU460 and GDU465 displays. The
GTR 20 is not supported with G3X installations using GDU37X displays.
Figure 19-1 GTR 20 Unit View (shown with mounting brackets on ends)

19.1 Equipment Description

The GTR 20 is a transceiver that operates in the 118.000 to 136.975 MHz frequency range. The receiver
sensitivity SINAD is greater than 6dB when the RF level is -107 dBm with 30% modulation. The
transmitter power is 10 W carrier minimum.
Model Part Number
GTR 20 011-03007-00
190-01115-01
Rev. AA
Table 19-1 Available Units
TX Power (Watt)
10
G3X/G3X Touch Installation Manual - GTR 20 Installation
8.33 KHz Spacing
N/A
25 KHz Spacing
Yes
Page 19-1