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190-00906-01 GTX 23 Installation Manual
Rev. C Page 1-6
1.7.3 Power Requirements
1.8 License Requirements
The Telecommunications Act of 1996, effective February 8, 1996, provides the FCC discretion to
eliminate radio station license requirements for aircraft and ships. The GTX 23 installation must comply
with current transmitter licensing requirements. To find out the specific details on whether a particular
installation is exempt from licensing, please visit the FCC web site http://wireless.fcc.gov/aviation.
If an aircraft license is required, make application for a license on FCC form 404, Application for Aircraft
Radio Station License. The FCC also has a fax-on-demand service to provide forms by fax. The GTX 23
owner accepts all responsibility for obtaining the proper licensing before using the GTX 23.
CAUTION
The UHF transmitter in this equipment is guaranteed to meet federal
communications commission acceptance over the operating temperature range.
Modifications not expressly approved by Garmin could invalidate the license and
make it unlawful to operate the equipment.
1.9 Certification
The conditions and tests required for TSO approval of this article are minimum performance standards. It
is the responsibility of those installing this article either on or within a specific type or class of aircraft to
determine that the aircraft installation conditions are within the TSO standards. The article may be
installed only if performed under 14 CFR Part 43 or the applicable airworthiness requirements.
It is the installer’s responsibility to ensure the ADS-B Out system is compliant with AC 20-165 and to
ensure compatibility between the GTX 23 and the ADS-B Out position source equipment. See Garmin
ADS-B Out Compatible Equipment (190-01533-00) for compatible equipment shown to be eligible for
14 CFR 91.227-compliant installations in accordance with AC 20-165.
External Suppression Output
Output: minimum is +18V (for 300 ohm load) and maximum
of +23V (for 2000 ohm load)
Audio Output 4.04 Vrms to 7.85 Vrms into a 500 ohm load
Table 1-4 Power Requirements
Characteristic Specification
Input Voltage
14/28 Vdc See the Environmental Qualification Form for details
on surge ratings and minimum/maximum operating voltages.
Power Input 22 Watts Typical, 45 Watts Maximum
Maximum Full TSO Reply Rate;
Mode C, 1200 PRF, Code 7777
1.6 A @ 28 Vdc, 3.1 A @14 Vdc
Maximum Quiescent 0.85 A @ 28 Vdc, 1.1A @ 14 Vdc
Table 1-3 General Specifications
Characteristic Specification