Lemon RX DSMP DIY Module for Legacy Transmitters DSMX DSM2 Compatible

Buddy RCSKU: LMT0002

Sale price$29.99

Customer Reviews

Based on 12 reviews
Jeff P.
Lemon DIY Module

Product worked almost as easy as I hoped it would (Not BuddyRC's problem). With help from members of RCGroups my problem was resolved.

Steven I.
It didn't work

Was supposed to be the missing link between tallyho head tracker and spektrum tx. Must be some secret stuff to make it work.

Please let us know what Spectrum transmitter you're using for further assistance?

Mark G.

Lemon RX DSMP DIY Module for Legacy Transmitters DSMX DSM2 Compatible

Wayne W.
Lemon DIY Module

Great little Tx module. I used it to create a retro vintage Reed Tx. Worked perfectly.

Not a panacea but effective

If you're rebuilding a vintage transmitter, upgrading to DSMX, this is one of the nicest option for the RF deck. I converted a couple Kraft 78 & Proline using the original encoders. It works fine, however jitter a small amount continuously around the neutral points. For a stable airplane, it's not a problem for flying but annoying. The RF deck works very well with modern digital encoders without any issues.

Download Manual


The Lemon Rx DIY module addresses the need for RC modeler in legacy transmitter conversion. The firmware is specifically designed to restore the original PPM waveform on Lemon Rx or Spektrum receiver. The module accepts 5V to 12V as supply input while accepting PPM signal from 3V to 12V with auto detection on PPM signal polarity. The module accepts high tolerance of PPM signal found in some legacy transmitter while accepting a minimum of 2 channels and up.

RCgroups discussion (Click below link for user manual page with link to RCGroups)

Caution before installation

- Avoid static electric by grounding yourself to metallic surface. Metallic surface working table is recommended (such as on top of a laundry).
- Do not interrupt power provided to the module initially. Doing so may damage the RF front-end. Make sure power wiring harness is connected securely before providing power to the module. 
- Install SMT connector to SMA conversion cable to the module as well as antenna prior to power on. Power on without antenna may possibly damages the device.

Antenna connection and Wiring implementation 1
The SMT U.FL connector closest to the center of module should only be used for RF transmission. The optional 3 header pins can be optionally soldered for Ground, V+ and PPM signal in. All these connections are needed for full operation with the on board button for binding and range check. See below diagram.

Wiring implementation 2
Below diagram uses the module pads for direct soldering to suit installation needs. The 3 header pins on implementation 1 can be ignored by using these connections. External bind push button soldering pad can be found here.

Bind procedure and implementation
Bind button on board can be used or externally wired with 2 pads labeled "PB".

- Turn on the transmitter and by pass all the warning messages (if any)
- Wait until the module turns on with red light on and green light flashing
- Release button
- Observe indication. Green light on means binding is completed. Red light flashing indicates bind fails. Turn off the transmitter and resume the whole binding procedure if bind fails.

Range check
During normal operation (green light on), press and hold the button puts the module in range check mode (red light on). Range check mode passes with valid control of the model from 30 meters away. Release the button to allow full power transmission.

1) This is not a Spektrum DSMX or DSM2 product, nor is it a copy of a Spektrum DSM2 or DSMX product. The Spektrum, DSMX and DSM2 brand is a trademark of Horizon Hobby, Inc.
2) This is not an underground black market fake Spektrum product. Lemon Rx quality is guaranteed.
3) Lemon Rx products are tested to be compatible with Spektrum's DSMX and or DSM2 product (Spketrum, DSMX and DSM2 are the registered trademark of Horizon Hobby, Inc.).

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