190-00906-00 GTX 33 Installation Manual
Rev. F Page 1-7
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 33 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 33
owner accepts all responsibility for obtaining the proper licensing before using the GTX 33.
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.
Table 1-4. GTX 33 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; 1200 PRF, Code
7777
1.6 A @ 27.5 Vdc, 3.1 A @13.75 Vdc
Maximum Quiescent 0.85 A @ 27.5 Vdc, 1.1 A @ 13.75 Vdc
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