Part #: 010-00294-61

Model: GTX-33DHES




Mode S Transponder (Diversity, Helol)

Part Number :




  • Remote Mount Mode S Digital Transponder with Diversity & Extended Squitter - H Denotes Helicopter Version
    • Version Options Available - See Part Number Chart below for more Details | See GTX-33 For Complete List
  • IFR certified unit features traffic datalink capability and meets European mandates for Mode S Level 2 surveillance
  • Solid-State Design
  • Delivers up to 250 watts of nominal power output
  • Includes remote ident and auto standby, TIS interface, and altitude monitor with voice alerts
  • With available Extend Squitter (ES), versions of the GTX 33 are a pathway to ADS-B compliance for FAA's proposed Next Gen airspace system
  • Certified to TSO-C166a standards for 1090 MHz extended squitter transmission
  • ES works seamlessly with existing ATC protocols
  • All the features of the standard GTX 33 transponder are retained in the ES version
  • Antenna diversity option is available with GTX 33D versions
  • Traffic data enabled by remote GTX 33 system can be displayed graphically on Garmin's integrated GPS/Comm/Nav systems that provide built-in transponder code selection


Dimensions: 6.29"W x 1.78"H x 11.05"D Weight: 3.3 lbs (unit only)
Display Type: Digital Voltage Range: 11-33
Temperature Range: -45°C to +70°C Altitude: 55,000 feet
Transmitter Frequency: 1090 MHz ± 1 MHz Transmitter Power: 125 Watts min, 250 Watts nom
Receiver Frequency: 1030 MHz Receiver Sensitivity: -74 dBm nom for 90% replies
Mode A Capability: 4096 Ident Codes Mode C Capability: 100' increments from -1000 to 62,700' 25' increments from -1000 to 50,175' w/suitable serial data altitude
Mode S Capability: Selective Ident Codes, Aircraft Type External Suppression Input: Low ≤ 0.5V; High ≥ 8V
External Suppresion Output: Output: min +18V (300 ohm load) & max +23V (2000 ohm load) Audio Output: 4.04 Vrms to 7.85 Vrms into 500 ohm load
Power Input: 22 Watts Typical, 45 Watts Max Max Full TSO Reply Rate; 1200 PRF, Code 7777: 1.6A @ 27.5 Vdc, 3.1A @ 13.75 Vdc
Maximum Quiescent: 0.85A @ 27.5 Vdc, 1.1A @ 13.75 Vdc Squawk Code Selection: Remote entry through CNX 80, GNS 480 or G1000
Solid-State Transmitter: Yes Verbal Alerts: Yes
TIS Alerts Compatible: Yes Outside Air Temperature Display: No
Pressure Altitude Readout:


Altitude Monitor Function: No
Density Altitude Readout: No Built-in Timers: No
Automatic ALT/GND Mode: Yes Diversity: No
Panel-Mounted: No    
Compliance: TSO-C112, Class 2A; RTCA DO-239; ETSO-2c112b, Class 1 Level 2s, Level 2es; TSO-C166a, B0, B1; DO-178B, Level C; DO-254, Level C; ETSO-C166a, B0, B1; ICAO Annex 10, Amendment 77    
Part Number: Description:
010-00294-60 GTX33DH w/ES (Extended Squitter) Unit Only 
010-00294-61 GTX33DH w/ES (Extended Squitter) and Install Kit 
011-00779-61 GTX33DH w/ES - Item PN* 
*Item PN = Actual PN on Unit - DO NOT USE to Place Order*


- Mode S Transponder (Diversity, Helo)
Price Condition Status

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact

In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.