Picture of product FDL-978-TXL

Part #:

Model: FDL-978-TXL





Part Number :

  • Universal Access Transmitter (UAT) Automatic Dependent Surveillance - Broadcast (ADS-B) Transmitter
  • Main component of the FreeFlight UAT ADS-B Transmitter System
  • UAT equipment class B1/B1S 978MHz Transmitter
  • Meets TSO-C154c requirements and minimum operational performance standards in RTCA/DO-282B
  • Designed to share aircraft position, velocity and other flight data with other aircraft and ground station equipment
  • Collects aircraft information from an aircraft GPS, pressure altitude sensor, and pilot interface controller
  • Transmits collected aircraft data out once per second
  • Inputs are received through configurable RS-232/422/485 serial, ARINC 429 serial, and/or discrete interfaces
  • Health and state of the unit are output on the configured serial links and/or discrete signals for display to the pilot
  • A Typical FDL-978-TX installation consists of:
  •  Several models offer flexibility in capability and price
  •  Designed to the most stringent FAA standards, certified to  TSO-C154c
  •  Lightweight and easy to install
  •  Enables real time traffic and free weather on compatible IPAD, MFDs and/or EFBs
  •  Increased ATC Coverage
  •  Allows for search and rescue operations
  •  In flight aircraft can receive vital information from remote ADS-B beacons on the ground
  •  Flight Schools or fleets can   easily track their aircraft
  • TC-978 Front Panel Controller,
  • FDL-978-TX Transmitter,
  • 2 UAT antennas,
  • GPS/WAAS Sensor*,
  • GPS Antenna *GPS Sensor can be an existing aircraft GPS source if it meets the interface requirements of the FDL-978-TX (ARINC 743A (ARINC 429) or FFS Nav Interface Protocol (RS-232 or RS-422))
  • An Air Data System or Pressure Altitude Sensor can optionally be interfaced to the FDL-978-TX to provide pressure altitude, altitude rate, and true airspeed if it meets the interface requirements of the FDL-978-TX (TC-978 Controller contains an ETSO-C88a certified pressure altitude encoder and RS-232 output)
  • DB-44 female connector
  • USB micro AB maintenance connector
  • Two TNC UAT antenna connectors
  • Top and bottom antenna outputs that can be configured to use the top only, bottom only or both (diversity)
  • Four status LEDs indicate the operational status of the unit (UAT, GPS, UAT TX, and UAT RX (future use))
  • Controller interface that provides low voltage power, system on/off discrete control, and communication interface on serial port 3
  • Can connect to any FFS navigation protocol compliant GPS through RS-232
  • Can connect to ARINC 743A compatible GPS through ARINC 429 bus
  • Can connect to an Altitude/Air Data Sensor through RS-232 or ARINC 429 bus and/or output encoded altitude on serial output
  • Can provide ownship traffic data through RS-232/RS-422
  • Six discrete inputs and two discrete outputs
  • Has personality module interface to retrieve configuration settings if the unit is replaced in the aircraft
  • Antenna Requirements: Requires a TSO-C66, C74, C112, or C154 UHF antenna, ensuring the antenna is a 50Ω antenna with VSWR < 1.7:1 at 978 MHz
  • Antennas meeting these requirements are: Comant CI-101 or RA Miller AV-22 ball antennas, Comant CI-105 blade antenna
  • In Class B1 ADS-B equipment (TSO-C154c) installations, antenna diversity is required (top & bottom)
  • In Class B1S (single antenna) installations only one antenna (top or bottom) is used - for airworthiness approval of ADS-B out systems, single bottom mounted antenna installations are allowed (TSO-C154c Class B1S)

Additional Information: FDL-978-TX Quick Reference Guide

FreeFlight UAT ADS-B Transmitter System Diagram

Dimensions: 1.37"H x 5.0"W x 5.75"D 1.76"H x 4.805"W x 7.05"D (extruded case) Weight:  1.4 lb Transmitter, 2 lb Transeiver
Input Voltage: 10-40 VDC Input Current: 0.7A at 12 VDC
Operating Temperature: -40°C +70°C Storage Temperature: -55°C to +85°C
Maximum Altitude: 50,000 ft Frequency: 978 MHz
Transmit Power: 50 Watts (40W @ antenna) Compliance/Cert: TSO-C154c (DO-282B, Class B1), DO-178B Level C
Interfaces: RS-232/422/485 -4, ARNIC 429 outputs -1, ARNIC inputs-2, Discrete outputs-3, Discrete inputs-6, Discrete in/output-1, Antenna-diversity capable Output power: 50W
environmental: DO-160F OUTPUT CURRENT (TO CONTROL HEAD): 0.35 A
CERTIFICATIONS: DO-282B, DO-178B Leve C, TSO-C154c*    
Part Number UAT Transmitter Description:
87098-00-FT0L RANGR Transmitter with WAAS GPS


- RANGR Transmitter with WAAS GPS
Price Condition Status
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 questions@seaerospace.com

The FreeFlight FDL-978 allows the flexibility to become ADS-B compliant and runs in conjunction with legacy transponders. However, even though ADS-B will become the FAA's primary source for surveillance, transponders will be required as a secondary (backup) surveillance source for the time being.

The FreeFlight FDL-978 will utilize L-Band antennas similar to your current transponder antenna. In very rare circumstances, a diplexer splitter can be installed to utilize a single antenna for a transponder and ADS- B Transmitter. It is highly recommended to install a dedicated antenna for ADS-B transmitters.

An approved ADS-B system does require high integrity GPS position source to be a valid ADS-B client. It is recommended to have at least a TSO-C145/146 GPS/WAAS position source. Please refer to AC20-165 (appendix 2) for position source requirements. FreeFlight Systems offer the 1201 and 1203C series GPS/ WAAS Sensors to supply position source options that fully meet the ADS-B requirements worldwide.

Yes, the RANGR Lite is meant for owner/operators who do not have an ES (Extended Squitter) upgradeable transponder or WAAS GPS in their aircraft. The less expensive unit (TXL) is Transmit only while the other (XVRL) includes ADS-B In as well which will display (traffic and weather) on the GNS-430 but would be need to be interfaced.

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.