Garmin GTX 330, GTXTM 330D TRANSPONDER INSTALLATION MANUAL
Brand: Garmin, Pages: 71
Page 11 from 71
GTX 330 Installation Manual Page 1-3
•Aircraft master switch turn-on option.
•Serial altitude or GPS groundspeed input.
•Serial altitude input. (Reduces wire count vs. parallel wire gray code altimeter interface.)
•Software update input.
•Supports Comm-A and Comm-B protocol.
•Temperature, Altitude Hold and Density Altitude.
•Digitally recorded voice and discrete warning annunciator activated by Altitude Hold when limits are
•Diversity: GTX 330 is available with or without the diversity feature.
The GTX 330 supports the following list of Binary Data Selector (BDS) registers:
•BDS (0,0) Air Initiated Comm-B (AICB)
•BDS (1,0) Data Link Capability Report
•BDS (1,7) Common Usage Ground Initiated Comm-B (GICB) Capability Report
•BDS (1,8) Mode S Specific Services GICB Capability Report
•BDS (1,9) Mode S Specific Services GICB Capability Report
•BDS (1,D) Mode S Specific Services Protocols (MSP) Capability Report
•BDS (2,0) Aircraft Identification
BDS register information is presented for the installation agency to understand the functionality of the
GTX 330, and make a determination that the unit complies with the requirements of their civil aviation
authorities. No further wiring or configuration programming is required for the unit.
Note that BDS (3,0) is only required for transponders compatible with ACAS/TCAS II. The GTX 330
does not support BDS (3,0).
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Page 1-4 GTX 330 Installation Manual
1.6 Technical Specifications
The following table presents general environmental specifications. For detailed specifications, see the
Environmental Qualification form in Appendix A.
1.6.1 Electrical Specifications
TSO, JTSO; GTX 330 TSO-C112*, JTSO-2C112a.
TSO, JTSO; GTX 330D TSO-C112*, JTSO-2C112a.
TSO ENV CAT Refer to Appendix A
FCC Authorization Emission Designator 12M0M1D
Applicable Documents RTCA DO-160D, DO-181C, EuroCAE ED-73A
Unit Software RTCA DO-178B Level D
-45°C to +70°C (continuous operation)
Power Requirements 11.0 to 33.0 Vdc; Power Input: 22 watts typical, 45
95% @ +50°C for 6 hours; 85% @ +38°C for 16 hours;
Tested to Category A in DO-160D
Altitude 55,000 Feet
Transmitter Frequency 1090 MHz ±1 MHz
Transmitter Power 125 watts minimum, 250 watts nominal.
Receiver Frequency 1030 MHz
Receiver Sensitivity -74 dBm nominal for 90% replies
Mode A Capability 4096 Identification Codes
Mode C Altitude Capability 100 Foot Increments from -1000 to 62,700 feet.
Mode S Altitude Capability 25 Foot Increments from -1000 to 50,175 feet with
suitable serial data altitude. 100 Foot Increments from
-1000 to 62,700 feet.
Mode S Capability Selective Identification Codes, Aircraft Type
External Suppression Input
Low≤ 0.5 V; High ≥ 8 V
4.04 Vrms to 7.85 Vrms into a 500 Ÿ load
*Note: Refer to Paragraph 1.6.3 Configurations Available, for TSO class.
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GTX 330 Installation Manual Page 1-5
1.6.2 Physical Characteristics
Bezel Height 1.65 inches (42 mm)
Bezel Width 6.25 inches (159 mm)
Rack Height (Dimple to Dimple) 1.68 inches (43 mm)
Rack Width 6.30 inches (160 mm)
Depth Behind Panel with Connectors
(measured from face of aircraft panel to
rear of connector backshells)11.25 inches (286 mm)
GTX 330/GTX 330D Unit Weight 3.4 lbs. (1.5 kg)
GTX 330/GTX 330D Rack Weight
(Installed with rack and connectors)4.2 lbs. (1.9 kg)
1.6.3 Configurations Available
GTX 330 010-00230-00 011-00455-00 No Black No 2A1 121 010
GTX 330 010-00230-01 011-00455-00 No Black Yes 2A1 121 010
GTX 330 010-00230-20 011-00455-20 No Gray No 2A1 121 010
GTX 330 010-00230-21 011-00455-20 No Gray Yes 2A1 121 010
GTX 330D 010-00293-00 011-00455-10 Yes Black No 2A1 121 011
GTX 330D 010-00293-01 011-00455-10 Yes Black Yes 2A1 121 011
GTX 330D 010-00293-20 011-00455-30 Yes Gray No 2A1 121 011
GTX 330D 010-00293-21 011-00455-30 Yes Gray Yes 2A1 121 011
*Note: Documentation includes pilot’s guide and warranty registration card.
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Page 1-6 GTX 330 Installation Manual
1.6.4 Equipment Available
Item Garmin P/N
Sub Assy, Connector Kit, GTX 330 011-00583-00
SMP, Install Rack, GTX 330 115-00294-00
Sub Assy, Backplate, GTX 330 011-00582-00
(For use with GTX 330)
Sub Assy, Backplate, GTX 330D 011-00582-01
(For use with GTX 330D)
Garmin GTX 330 Antenna kit*
(two required for diversity)010-10160-00
*Note: A transponder antenna approved to TSO C66( ) or C74( ) that has been
installed to meet the requirements of this manual may be approved for use
with the GTX 330.
1.6.5 Additional Equipment Required
•Antenna Sealant - Use antenna manufacturer’s instructions, install according to FAA
AC 43.13-1B and AC 43.13-2A.
•Cables - The installer will supply all system cables including circuit breakers. Cable
requirements and fabrication is detailed in Section 2 of this manual.
•Hardware - #6-32 x 100
°Flat Head Screw (6 ea.) and #6-32 Self-Locking Nut (6 ea.).
Hardware required to mount the installation rack is not provided.
•Encoding Altitude Digitizer - Use encoding altimeter manufacturer’s instructions, install
according to FAA AC 43.13-1B and AC 43.13-2A. The Garmin GAE 43 (Garmin P/N
013-00066-00) can provide altitude data in either serial or parallel gray code format.
1.7 Installation Approval
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. TSO articles must have
separate approval for installation in an aircraft. The article may be installed only if performed under 14
CFR part 43 or the applicable airworthiness requirements. For GTX 330 TSO compliance and STC, see
Appendix A. For antenna TSO compliance, refer to antenna manufacturer’s literature.
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GTX 330 Installation Manual Page 1-7
1.8 Aircraft Station Licensing 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 330 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 330 owner accepts all responsibility for obtaining the proper licensing before using the transponder.
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.