Spektrum SPM4650 / SRXL2 DSMX Radio Receiver (Aircraft)

Regular price $31.99

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The Spektrum SPM4650 DSMX SRXL2 serial micro radio receiver is designed to be used with FPV drones. This receiver provides more value, functionality and fly-by telemetry while decreasing the size and weight of the already micro-sized Spektrum serial receiver.


The SPM4650 uses Spektrum's feature-rich SRXL2 protocol to give pilots a blazing fast serial data connection with up to 20 channels. SRXL2 is a powerful communication protocol that improves bi-directional communication between the radio system and flight controller for added telemetry functionality and flight control configuration right from the pilots' Spektrum Transmitter, all over one signal wire.




  • Antenna Length: 3.9" (100mm)
  • Bind Method: Bind Button or SRXL2 Bind Command
  • Channels: 20
  • Data Port: Yes
  • Input Voltage: 3.3 - 8.4V
  • Length: 0.67" (17mm)
  • Modulation: DSMX/DSM2
  • Range: Full
  • Telemetry: Fly By
  • Type: SRXL2
  • Weight: 0.05oz (1.4g) including antennas
  • Width: 0.51" (13mm)




(1) SPM4650 Receiver
(2) U.FL Antenna
(1) 6” Receiver Extension Cable
(1) 4-Pin Connector
(1) Product Manual
(1) Clear Heat Shrink Wrap



  • Betaflight 4.1 and the latest configurator supports SRXL2 so there are no CLI commands needed! For reference, see below:
    • feature -RSSI_ADC
    • feature RX_SERIAL
    • feature TELEMETRY
    • map TAER1234
    • set rssi_channel = 0
    • set serialrx_provider = SRXL2
    • set serialrx_inverted = OFF
    • set srxl2_unit_id = 1
    • set srxl2_baud_fast = ON



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