You are buying the latest 2023 Module from one of the most experienced and respected aeromodellers in the country with over 50 years practical experience in all branches of the sport! 

We understand, use, fly and stand behind what we sell! The free advice comes from 50 years of experience with radio control!

LEMON RX DSMP DIY MODULE FOR VINTAGE TRANSMITTER (SPEKTRUM DSMX/DSM2 COMPATIBLE). Condition is "New". Dispatched with Royal Mail 1st Class.

Photos show some of the classic RC transmitters that I have converted for fellow enthusiasts and customers.

The range and reliability is equal to or better than other 2.4 GHz modules from ORX and FrSky that I have used in conversions & on LOW POWER range tests, we achieve regularly over 100 meters range!!

The compact size enables it to be hidden away inside the Transmitter with no issues.

We now also offer 3D printed mounting kits and antenna bases to make the conversion of your classic Tx with the LemonRx DIY Module even easier for you to achieve, they are available here from us here: !NEW! Lemon Rx  DIY MODULE & Antenna MOUNTING KIT FOR VINTAGE TRANSMITTER | eBay

Arduino based encoders are also available separately featuring Servo Reverse, Throttle Lock, Aileron Differential and Rate/Expo to increase the functionality of your classic transmitter up to modern standards, if required.

Video of LEMON RX modules

https://youtu.be/Nv1Ma6YhCMM

Video of encoder in operation

https://youtu.be/yy8Fz-8dTdY

Lemon RX receivers for sale here: planesamtheman on eBay

Please note that when used in multi model memory transmitters, by using the same type of protocol receivers (DSM2 OR DSMX from any manufacturer) in all the models in the Tx memory, you will then avoid having to rebind the module to the receiver selected,

( if it is of a different protocol to the protocol that the module has already been bound with..)


In short, & wherever possible, install the same type of protocol Rx in all models in the Tx memory.


If you have FUTABA or HITEC radio, these can also be converted using this module and the pin layouts that need to be used by the module with these transmitters are in the listing photos above.

FUTABA OWNERS PLEASE NOTE: We have found that Futaba FF9 etc with the rectangular trainer socket need to have the PPM signal taken from pin 3 of  the trainer socket and not direct from the module bay pins! (see last diagram in the listing photos)

KO PROPO OWNERS PLEASE NOTE:  that if you are replacing the KO 2.4 plug in module RF-901S used in the EX-5 Mars, EX-10 Helios and Universe 3 Transmitters,  it has been necessary to add a pull up resistor with a resistance of 12kOhms across the V positive and ppm connections on the Lemon module to ensure the module gets a strong enough signal from the Tx encoder to be able to function correctly.  Also if you have a servo travel throw, set this when binding to a maximum of 100 %, otherwise the KO encoder pulsewidth will be too wide for the module to bind correctly!! Also in the Menu and go into the RESPONS and change it from ULTRA to NORMAL.

JR X2610 OWNERS, please see the conversion connections at 2:44 min here:
https://youtu.be/HRQ0vAHxYDA?si=6DN3tXZ1KfLZd5FE


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.


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 labelled "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.

Note:
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.).