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Part #: 010-01083-01

Model: GTX-325



Part Number :

  • GTX 325 offers a number of useful timing and display functions
  • Timers include trip time, flight time, count-up and count-down, while display functions include readouts for density and pressure altitude as well as static (outside) air temperature
  •  Its solid-state design works to maximize service life and assure dependable ATC traffic surveillance
  • Modern, digital Mode C transponder designed for aircraft that fly in airspace where ADS-B isn’t required or on aircraft that is equipped with a UAT ADS-B solution
  • Offers useful timing and display functions such as timers, altitude monitoring, current pressure altitude readout and more
  • Quick replacement for existing transponders, with common 1.65” tall form factor
  • Optional Garmin altitude encoder simplifies installation, saves space and reduces potential service expenses should the transponder need to be removed
  • Connects to GTN series navigators for transponder code selection and control
  • The GTX 325 transponder can also be paired with an optional Garmin altitude encoder to satisfy Mode C data transmission requirements for IFR
  • The external Garmin altitude encoder mounts separately on the install rack
  • Solid state transmitter (more efficient, longer life): yes
  • Aural alerts: yes
  • Total air temperature (TAT): yes
  • Pressure altitude readout: yes
  • Altitude monitor function: yes
  • Density altitude readout: yes
  • Built-in timers: yes
  • Automatic ALT/GND mode: yes
  • Pressure altitude encoder module (mounts to connector backplate): Optional
weight:  (unit, rack, connectors)  2.9 lbs (1.32 kg) Dimensions: depth is measured from face of instrument panel: 1.68” x 6.30” x 10.07” (42 x 160 x 256 mm)
display type: Digital Voltage range: 14/28 VDC (14 W max)
transmit power: 200 W minimum temperature: -40° C to +70° C
operating altitude: To 55,000 ft (16,800 m) environment compliance: (TSO Approved)  DO-160G
software compliance: (TSO Approved) DO-178 Levels B, C, D hardware compliance: (TSO Approved)  DO-254 Level C; TSO compliance (Approved): TSO-C88b (w/opt. alt. encoder); TSO-C74d
mount type:  Panel transponder type: Mode A/C
squawk code selection:  Push-button cooling input: Not required





- Mode C Transponder
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

No. While the GTX-325 is a Mode C transponder replacement for the Mode C GTX-327, they have different connectors.  The GTX-325 uses a 62 pin high-density connector while the GTX-327 has a standard 25 pin D-sub type connector.