4-Channel UM Receiver (DSM2/DSMX Compatible)

Original price was: $79.00.Current price is: $59.00.

This 4 Channel UM Receiver w/Brushed ESC is compatible with Spektrum DSM2/DSMX modulation protocols and features two on-board linear servos that are mapped to Rudder and Elevator.  No soldering required as these boards comes pre-wired with a three inch battery lead with UM connector AND a two pin female motor plug (1.27mm spacing).

Note: This item item is similar in function to the discontinued PKZ3351, PKZ3352, PKZU1151, PKZU1152, SPMAR6400 and SPMAR6410 as used in many ultra-micro model aircraft applications.  And while generally comparable in size and scope to the ParkZone/Spektrum series of receivers listed above, this product will not be a direct fit for mounting solutions made exclusively for the original ParkZone equipment and may not match the programed servo mapping for your application.  To mount the board, we suggest only using double sided foam servo tape.  Additionally, to maintain compatibility with the setup instructions provided in Stevens Aeromodel brand kits, we suggest a modern DSM2/DSMX compatible Spektrum transmitter, with computer mixing functions.  Such transmitters will support swapping the elevator and rudder channel assignments for the RX and will allow proper mapping of the rudder output on the 4 Channel UM Receiver board to the roll control stick on your transmitter.   Cheap bind and fly “Game box” style controllers, non-computer models and many older Spektrum/JR radios, lack these conveniences – requiring more difficult manual setup.  This product is best suited for the kit/scratch builder and we make no claim of suitability of function for RTF style aircraft.

Compatible with Spektrum DSMX and DSM2 transmitters
Item Number: SAR6410/S

(See Additional Details below for instructions)

This product is currently in stock.

Additional Details

Product Highlights
Spektrum DSMX/DSM2 compatible receiver
Onboard linear servos mapped to Rudder and Elevator
Built-in 3A brushed ESC with throttle lock
Independent signal output for adapting external ESC (soldering required)

Size: 24.5 x 24 x 7.4mm (not including power leads)
Weight: 3.5g
Input voltage: 3.5~5.0V

Connector Details
Battery Connector: Molex Picoblade 1.25mm Pitch (protected male)
Motor Connector: Two-pin Round 1.27mm Pitch (female)
Servo Connector: JST-SH 1mm (protected male)

Connector Details
Battery Connector: Molex Picoblade 1.25mm Pitch (protected male)
Motor Connector: Two-pin Round 1.27mm Pitch (female)
Servo Connector: JST-SH 1mm (protected male)

Aileron 1: negative | positive | signal
Aileron 2 (reversed aileron output): signal | positive | negative

NOTE: For the aileron servo wiring order given above, view the board with motor connector up and aileron ports in lower left corner, then read right to left.

Caution!  When binding or making adjustments to the servo and ESC functions, remove the propeller from the model to prevent injury or damage.

Mounting Instructions
Please bench-test your receiver prior to mounting it within your model.  This receiver is a delicate item and requires thoughtful care in handling and installation.  Many adhesive products such as Cyanoacrylate (CA) and most store-bought Silicones are corrosive and will damage the exposed electronics – NEVER use adhesive glue or silicone caulk to mount this board within your model.  Instead, mount this receiver using only double-sided foam servo tape.  Be careful when working around or making repairs on your model as glue and other foreign debris, that enter the servo drive train can potentially interfere with the fragile servo drive mechanisms.

The servo drive train is susceptible to binding, if the control surfaces attached to the servo are not absolutely free moving.  Avoid use in applications that use creased foam control surfaces, CA hinges, and full-length double-taped hinges (tape hinges made by taping along both the top and bottom of the entire hinge line).  Ensure near zero resistance to movement of your control surface and push-rod assembly prior to installation.  Hinges that work best are: single tape hinges (taped along either a top or bottom surface but not both), sewn hinges, and hinges made with covering film.  Binding of the servo drive train can also be caused, by the rough handling of the receiver, resulting in the improper fitting of the servo spur gear to the shaft.  A gap of .004″ (the thickness of a sheet of copy paper) between the servo body and the spur gear or the drive train must be maintained or the servo drive may bind.

Binding instructions
With your transmitter off, power up the model.  After 10 seconds with no signal received, the receiver will enter binding mode automatically.  Binding mode is indicated by a change from a slow flash of the onboard LED light to a rapid blinking.  Once bind mode has been entered, quickly power on your transmitter and perform the binding function according to the instructions that came with your transmitter.  A successful bind will first cause the rapid blinking LED to return to a slow flash and then to a solid light – indicating that a signal from the transmitter is being received.

To prevent the receiver from entering bind mode, always power on your transmitter before powering on the model.  Should you forget and power on the model first and the receiver enters the binding function, simply power down the model and perform the proper power on sequence of transmitter first, then receiver.

Releasing the throttle lock function
The receiver features a throttle lock for the brushed speed controller.  When power is initially connected to the receiver, the output for the onboard ESC is locked.  To unlock and start the throttle, move the throttle stick to the lowest position – the red LED on the receiver will flash once, indicating the onboard ESC is unlocked.  If you experience difficulties with the receiver unlocking the throttle, this can indicate a problem with the receiver recognizing the lowest throttle stick position – this is often due to the throttle channel being reversed, or the throttle endpoint not being set low enough.  See your transmitter owner manual for guidance on how to adjust the low throttle endpoint and/or reverse the throttle channel.

Spektrum DX6i setup (to emulate PKZ3351/2 PKZU1151/2 receiver Stevens Aeromodel aircraft)

Swapping RX port assignments

  • From the Function List select System Setup
  • Confirm RF will be disabled YES
  • Scroll to Channel Assign and select
  • Scroll to ELEV and set to Rudder
  • Scroll to RUDD and set to Elevator
  • Exit back to main menu

For 3-Channel models only – mix rudder output to aileron

  • Enter the Function List and scroll to Mixing – select Mixing
  • Scroll to AIL > RUD
  • Set both Right and Left values to 100%
  • Set Switch from Inhibit to On
  • Exit back to main menu

Dual Aileron and “Flaperon” Servo Function

When paired with a capable computer radio, the SAR6410 receiver is capable of outputting dual aileron control to both the “Aileron” (standard direction) and “AUX1” (reversed direction) ports.  These instructions apply to our SAR6410 receiver and our ultra-micro linear servos.  Support for this function is not guaranteed with 3rd party servos.

To enjoy the dual aileron servo functionality of the SAR6410 receiver, you must follow these instruction in the order given below EXACTLY.

  1.  Follow the guidance given by your transmitter (TX) manufactures manual to establish a new model in memory.  When setting up the model, specify that dual ailerons and/or flaperons will be used, this setting is typically found under the model ‘wing type’ subheading.  Follow the instructions provided by your TX manufacturer.
  2.  With the TX properly programed for dual ailerons, now and only now bind the receiver to the TX, to activate this function on the SAR6410 receiver.

Common concerns: “I’ve plugged in two ailerons servos but only the aileron servo on the Aileron port is active, the AUX1 port servo does not respond to aileron inputs on my TX…”

In nearly every instance, this is due to not establishing the proper dual aileron control programing in the transmitter FIRST (prior to binding).  Go back to step 1 and ensure you’ve setup your TX properly – THEN REBIND.  Failure to bind after setting up dual ailerons in your TX will result in no function on the AUX1 (channel 5) port. You may have bound your TX to the RX previously and if when bound, the TX is not setup properly for dual aileron control, this function will likewise not be activated in the RX.

This product has been independently developed and tested to function with Spektrum’s DSMX and DSM2 2.4 GHz modulation protocols. Spektrum, DSMX and DSM2 are the registered trademark of Horizon Hobby, Inc.  

Warranty:  This product will be tested for proper function before shipment and is guaranteed to work upon arrival – you must contact us within 30 days of purchase to report a non-functioning unit for replacement.  Please test your unit prior to installing/mounting it into your application.  Units that show evidence of use or have been mounted with or contaminated by any adhesive glue or silicone are not eligible for replacement.  No other warranty is offered or implied.


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