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Seriously Pro Racing Dual-IR LED Transponder BEC

Seriously Pro Racing Dual-IR LED Transponder BEC

SeriouslyPro Flight Controllers
PDF icon Manual354.15 KB

Get ready to race with the SP Dual-IR LED Lap-Timing Transponder System. As you fly around the track the transponder continually transmits your unique code via IR. As your aircraft passes the start/finish timing gate the track-side receiver records your lap-time.

  • Compatible with iLAP receiver systems, as used by by most racing clubs worldwide.
  • Two LEDs which can be used for a wider transmission angle or clockwise/anti-clockwise tracks.
  • No fiddling around trying to fit transponders in a hurry on race-day. Just turn up at the race and have the race officials scan your transponder and you're ready!
  • The SPRacingTBEC is the only Race Transponder to feature a built-in 5V regulator!

Now shipping Revision D boards!  Changes as follows:

  • Battery input on one side and 5V IN/OUT on the opposite side of the board.
  • Large arrow to indicate power flow.
  • New voltage regulator and larger capacitors for improved reliability.


The SPRacingTBEC is the only Race Transponder to feature a built-in 5V regulator!

Built-in 5v regulator (BEC)

The built-in 5V 1 AMP regulator means you don't need a seperate 5V regulator. Plenty of power for your FC, RX, LEDs, etc.


Works at distances up to 5m, even outdoors in sunlight. Use more track-side receivers to further increase sensitivity.

Dual IR LEDs

Two LEDs allows you to position for greater intensity or for clockwise and anti-clockwise tracks.

iLap Compatible

Works with the most popular transponder receiver system currently in-use worldwide today.


Uses a high-speed transmission to eliminate interference.

7-Digit Code

Longer codes, compared to other systems, means you won't have issues with duplicate codes.

Flexible Form Factor

Mount using 30.5mm mount holes and stack above your FC. Or remove the tabs, heat-shrink it and use velcro to mount as appropriate.

Flexible Power Options

Power using 2S-5S Lipo OR power from existing 5V supply, you choose.


Suitable for racing clubs or pilot ownership

Flexible design allows racing club owners to fit them with standard 3 pin cable for use on race days.



  • Innovative - First racing transponder with integrated regulator.
  • Flexible - Mounting tabs are removable
  • Durable - Through-hole connectors for power. Thick PCB.
  • Stackable - Pin Headers and 30.5mm mounting holes all stacking
  • Compact - Lightweight and measures just 26x13.5m without mounting tabs or 36x13.5m with mounting tabs.
  • Professional - Symmetrical, neat and tidy
  • 5V regulator, 1 AMP
  • Power LED
  • Activity LED
  • 1x 2pin though-holes for pin headers for battery.
  • 1x 2pin though-holes for pin headers for 5V in/out.
  • 1x 4pin bottom mounted, JST-SH socket for SWD debugging
  • 1x 4pin bottom mounted, JST-SH socket for UART
  • 2x 2pin through-holes for IR LEDs (supplied).
  • Comes with right-angled and straight pin headers
  • STM32 CPU.
  • 5V 1A Regulator for powering FC, receiver and small servos
  • 2 IR LEDs and unique code for race transponder
  • Copper-etched SP Racing logos 
  • Size:  36x13.5mm with 2 x 30.5mm mounting hole tabs (26x13.5mm with tabs removed)
  • Weight ~3 grams


  • 1 x SPRacingTBEC Race Transponder Board
  • 2 x IR LEDs
  • 2 x 2-way right-angled pin headers (black).
  • 2 x 2-way straight pin headers (black).
  • Pre-programmed unique 7-digit code


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