Transponders
transponders — pre-owned
Browse 1,250 transponders — pre-owned on eBay — listings updated every few minutes. All items are pre-owned and sold by eBay sellers directly.

Garmin GTX 330 Transponder PN 011-00455-00 NON-ES w/ Tray and Fast Stack Harness
Up for sale is a used Garmin GTX 330 Transponder PN 011-00455-00 NON-ES w/ Tray and Fast Stack Harness. Unit was removed only for a panel upgrade to a GTX 345 from a 12v aircraft. Unit is in good, working used condition with normal wear/tear from use.

Bendix King KT 76A Transponder 14V - Free Shipping
(1) Bendix King KT 76A Transponder PN 066-1062-00. The KT-76A is a quality King transponder, and an update of the original KT-76. This transponder was solid and dependable. System test capability. Mode C compatibility.

Bendix King KT 76A Transponder 14V - Yellow Tag - Free Shipping
(1) Bendix King KT 76A Transponder PN 066-1062-00. The KT-76A is a quality King transponder, and an update of the original KT-76. This transponder was solid and dependable. Mode C compatibility. 4096 discrete codes.

APPAREO STRATUS ES TRANSPONDER
The Stratus ES is a 1090 MHz extended squitter (ES) transponder. Stratus ES is a solid state transmitter that provides 310 watts nominal power output. Its modern keypad makes entering a squawk code easy.

Narco At 150 Tso Transponder
Operational when removed from aircraft. Sold as-is.

Garmin GTX 327 Transponder
Garmin GTX327 Transponder pn: 011-00490-00 sold with tray as shown. Unit was removed from aircraft during upgrade, unit was working when removed and sold in "as removed" condition.

Transponder KT76 066-1034-00 Removed Working

KING KT 78 TRANSPONDER P/N 066-1034-02
Has tray and was working when removed from aircraft. S/N: 19602

Bendix King KT76A TSO 066-1062-00
Working when removed from aircraft. Includes tray. S/N: 105725

GARMIN GTX 330ES ADS-B TRANSPONDER PN 011-00455-60 With New FAA 8130-3 Form
GARMIN GTX 330ES ADS-B TRANSPONDER 011-00455-60 This unit is in great condition and Includes a new 8130-3 form. Satisfaction guaranteed with a 30 day warranty. Will ship worldwide

King KA-60 071-1174-00 Avionics DME Transponder Antenna Vintage
Manufacturer: King Radio Corp. (Olathe, KS, USA). D2A/JY/XXXXXX XXXXX CLIA. Model / Part Number: KA-60 / 071-1174-00.

ANEC CAMINO-101 Class B AIS Transponder
Marine consignment store purchase don’t know anything about it it doesn’t come with anything other the photographed

Trig Transponder TT 26 PN 01629-00-01
This unit is in great condition and fully working. Will ship worldwide Expedited shipping available at checkout

Garmin GTX 320A Transponder PN 0110072800 With 2025 FAA 8130 G2U
You save $153.45

king KT 78 transponder
king KT 78 transponder. Condition is Used. Shipped with USPS Ground Advantage.

Garmin GTX 320 Transponder PN 0110025910 With 2025 FAA 8130 G2U
You save $139.50

Collins Transponder TDR-950 TSO + Tray (3889)
Collins Transponder TDR-950 TSO + Tray (3889) USED removed from Beechcraft Sundowner C23 Tach 1997.02. Upgraded my avionics all shipping is through USPS flat rate box.

KT76A ATC Transponder, P/N 066-1062-00
WORKING AS REMOVED. King FCC Data KT76A ATC Responder, S/N 8152, P/N 066-1062-00

GARMIN GTX 335 ADS-B OUT MODE S TRANSPONDER P/N 011-03300-40 With New 8130-3
This unit is in great condition and fully tested and inspected with new April 2026 FAA 8130-3 form. Satisfaction guaranteed with a 30 day warranty. No tray or connector. Will ship worldwide Expedited shipping available at checkout

Bendix King KT-78 Transponder 14V P/N: 066-1034-04 w/ Tray Untested

AMEC CUBO -160 Transponder Splitter
Marine consignment store purchase don’t know anything about it it doesn’t come with anything other the photographed

Cessna ARC RT 359A 14 Volt Transponder with New FAA 8130-3 Form
This unit is in good working condition. Fully tested and inspected with new FAA 8130-3 form. Satisfaction guaranteed with a 30 day warranty. 14 volt Will ship worldwide Expedited shipping options available at the checkout page

GARMIN GTX 345 TRANSPONDER P/N 011-03302-00 With New 8130-3
This unit is in great condition and fully tested and inspected with new may 2026 FAA 8130-3 form. The main, audio, Adsb, and GPS software have all been recently updated. Satisfaction guaranteed with a 30 day warranty. Will ship worldwide Expedited shipping available at checkout

Garmin GTX 330 Non Extended Squitter Transponder. Works perfectly
Garmin GTX 330 non extended Squitter transponder. Works flawlessly. Removed from my panel to install a GTX327. Needed mode C/A to work correctly with my Uavonix Tail beacon. Last picture shows it installed and working on June 27 2026. 

Garmin GTX 327 Transponder, P/N 011-00490-00, S/N 83727348, TSO
AI Description: Garmin GTX 327 Transponder Part Number 011-00490-00 and Serial Number 83727348 is a reliable and essential component for Avionics systems in aviation. With a warranty of 30 days, this transponder ensures compatibility with various aircraft and provides accurate transponder signals for air traffic control. Trusted for its quality and performance, this Garmin product is a crucial part of aircraft navigation systems. My description: pulled out of operational GA aircraft (not experimental) and working upon removal. Only removed due to avionics upgrade, comes as shown in pics. Transponder, tray and backplate only… GNS530, KX155, GMA340 - Not included… Will be shipped protected in bubble wrap. Contact me for questions.

Garmin GTX335 ADS-B Out Transponder internal WAAS P/N 011-03300-41 & install kit
This GTX 335 has internal WAAS. The Garmin GTX 335 transponders are ADS-B out compliant. This GTX 335 transponder was only used for about a year before the owner decided to upgraded to a GTX 345 transponder.

ARC Cessna RT 359A Transponder 41420-0028 - As Removed
This unit was recently removed but is now not powering up. It is sold as is with no warranty. Will ship worldwide

Bendix King KT 76C ATC Transponder PN 066-01156-0101 with New 8130-3
This unit is in great condition and fully tested and inspected with November 2025 FAA 8130-3 form. Satisfaction guaranteed with a 30 day warranty. Expedited shipping available at checkout Will ship worldwide

Bendix/King KT 76C ATC Transponder P/N 066-01156-0101
Bendix/King KT 76C Transponder it has its certification valid until January 2028. Working perfectly. Display works perfect.

JOTRON TRON SART 9 GHz RADAR TRANSPONDER
This Jotron TRON SART 9 GHz Radar Transponder is a top-of-the-line aviation device. With its advanced technology and high-quality construction, it is sure to enhance any aircraft's performance. Made in Canada, this transponder is a must-have for any aviation enthusiast. Featuring a brand name you can trust, this device has a unique design that sets it apart from the rest. It comes with a warranty, ensuring that you can rely on it for years to come. Perfect for those looking to upgrade their aviation equipment, this Jotron TRON SART 9 GHz Radar Transponder is an excellent choice.

Garmin GTX 320A Transponder PN 011-00728-00 Good Condition
The Garmin GTX 320A Transponder PN 011-00728-00 is a high-quality aviation part manufactured by Garmin in the United States. It is designed to be compatible with avionics systems and comes with a 30-day warranty for added peace of mind. This transponder is essential for aircraft navigation and communication, ensuring safety and efficiency in the skies. As a trusted brand in the aviation industry, Garmin products are known for their reliability and precision, making this transponder a valuable component for any aircraft.

Garmin GTX 23 p/n 011-02803-02
GTX 23 is an affordable, full-featured remote digital transponder for Mode S traffic surveillance.

GARMIN GTX 330D ES ADS-B TRANSPONDER PN 011-00455-90 With New 8130-3 Form
GARMIN GTX 330DES ADS-B TRANSPONDER 011-00455-90 This unit is in great condition and fully tested and inspected. Includes a new July 2025 8130-3 form. Satisfaction guaranteed with a 30 day warranty. Will ship worldwide

Narco AT 150 TSO Transponder - Serviced with New FAA 8130-3 Form
This unit is in good used condition and just serviced. Fully tested and inspected with new FAA 8130-3 form. Satisfaction guaranteed with a 30 day warranty. Will ship worldwide

GARMIN GTX 330ES ADS-B TRANSPONDER PN 011-00455-60 With New FAA 8130-3 Form
GARMIN GTX 330ES ADS-B TRANSPONDER 011-00455-60 This unit is in great condition and fully working and Includes a new 8130-3 form. Satisfaction guaranteed with a 30 day warranty. Will ship worldwide

GARMIN GTX 330 TRANSPONDER PN 011-00455-00 NON-ES With New 8130-3
GARMIN GTX 330 TRANSPONDER 011-00455-00 This unit is in great condition and has all new button contacts. Includes a new 8130-3 form. Satisfaction guaranteed with a 30 day warranty. This model is the NON-ES version. Will ship worldwide

Garmin GTX 335 ADS-B Out Mode S Aircraft Transponder P/N 011-03300-20 Untested
This unit was acquired from a government/aviation surplus auction. I do not have the proper aircraft wiring harness, rack, or test equipment to power or test the unit. Therefore it is being sold: AS-IS UNTETSTED NO GUARANTEES OF OPERATION Cosmetically, the unit appears to be in very good condition with only light signs of normal handling. Please review all photos carefully as they are part of the description. ⸻ Included * Garmin GTX 335 transponder only No tray, mounting rack, connectors, antenna, wiring harness, manuals, or accessories are included unless shown in the photos.

Transponder KT74 89000007-000002 w/ April 2026 Tested 8130

Collins TDR-94D transponder 622-9210-007. Working condition.
Unit in working condition. Solid-state, airborne, ATC transponder providing Mode A,C, and S operation. Collins TDR-94D unit. SIZE: 3.33"H x 4.90"W x 12.50"L WEIGHT: 8.5 lbs. FAA TSO: TSO-C112, class 2A RTCA: DO-181, DO-144.

Bendix King MST-67A 066-01143-0601 Mode S Transponder Aircraft Avionics Unit Avi
#Avia_Box_17.