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Essential Instructions (LM0087X)
Description ......................................................................................................................................... 1
Setting Up the LM0087X Receiver ....................................................................................................... 2
Step 1: Powering the Receiver .................................................................................................................................. 2
Step 2: Binding the Receiver ..................................................................................................................................... 3
Step 3: Setting Failsafe .............................................................................................................................................. 3
Step 4: Activating Stabilization ................................................................................................................................. 4
Step 5: Using Stabilization ........................................................................................................................................ 8
Using Telemetry ................................................................................................................................ 13
Factory Reset the Receiver ............................................................................................................... 14
Appendices ....................................................................................................................................... 15
Appendix 1: Setting Up Text Display with EdgeTX .................................................................................................. 15
Appendix 2: Meaning of the LM0087X Receiver LEDs ............................................................................................ 15
Appendix 3: Understanding Throttle Lock .............................................................................................................. 16
Appendix 4: Troubleshooting Text Display ............................................................................................................. 17
This document is specifically tailored to the LM0087X receiver. For instructions relating to the earlier LM0087,
which did not have the Text Display programming feature, here is the download link:
https://www.rcgroups.com/forums/showatt.php?attachmentid=16684581&d=1668136630
Description
The Lemon Rx LM0087 Ten-channel Stabilized Receiver is a full range DSMX/DSM2™-compatible receiver, part of
Lemon's Generation 2 line. It combines full-range telemetry functions with the well proven Lemon rate stabilizer
technology to iron out the turbulence.
The Lemon stabilizer is small and light. Despite its low cost, it offers long range and high performance with its
"dual diversity" antenna system. A Lemon DSMP satellite receiver can be added to enhance signal reliability but
is not normally required.
The slim line case, ten available channels and built-in barometric sensor will be particularly attractive to glider
pilots requiring a compact package. It also has built in isolated inputs for multiple power sources.
The receiver automatically switches mode between DSMX™ and DSM2™ as required.
The LM0087 works with virtually any programmable Spektrum transmitter, including the first- and second-
generation DX series, as well as the newer NX and iX transmitters. It also works with open-source transmitters
using an add-on DSM2 or DSMX compatible module, as well as with Multiprotocol transmitters such as
RadioMaster TX16S. Telemetry is available if supported by the transmitter.
Despite being labelled a 10-channel receiver based on the actual number of available control channels, the
LM0087, when configured as a stabiliser, normally has either 8 or 9 channels available as outputs. Channel 7 is
normally allocated to switch the stabiliser on and off in flight and stabilizer Master Gain is on channel 8. Channel
7 can be freed up by configuring the stabilizer to be always-on. A ten-channel transmitter with voice capability is
the minimum required to allow use of all the available functionality.
1
10CH TXT Essential Instructions v1.docx
2024-09-05
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Summary of Contents for Lemon LM0087X
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Page 1: Table Of Contents
The Lemon stabilizer is small and light. Despite its low cost, it offers long range and high performance with its “dual diversity” antenna system. A Lemon DSMP satellite receiver can be added to enhance signal reliability but is not normally required. -
Page 2: Setting Up The Lm0087X Receiver
The original version of the LM0087 used LEDs and buttons for programming. The new version, introduced in August 2024 and referred to as the LM0087X, added the Text Display feature to simplify programming, but it also retains the earlier lights and buttons programming approach as an option. -
Page 3: Step 2: Binding The Receiver
Via the Throttle Connector Using an electronic speed controller (ESC) with inbuilt battery eliminator circuit (BEC). This is the most common method used for electric powered models. Connected to channel 1. Via BEC1 Using an external battery or external BEC. The Channel 1 connector is used to control throttle via a servo (for IC power) or an ESC that does not have an integrated BEC. -
Page 4: Step 4: Activating Stabilization
Programming the Receiver For the LM0087X, programming the receiver to activate stabilization can be done in either of two ways: (1) with Text Display, using the transmitter to display and adjust the various settings, or (2) the older way, using LEDs and buttons on the receiver. - Page 5 Programming Stabilization with Text Display using a Spektrum Generation 2 or higher radio Text Display is an enhancement to the firmware of Lemon telemetry receivers (7- and 10-channel). It allows you to see and change the settings of the stabilizer on the screen of your transmitter, rather than relying on lights and button-pushing, and is particularly useful when setting up gains, checking the stabilizer response direction, and identifying what mixes are currently set.
- Page 6 Power up the receiver (with or without servos connected). Within 60 seconds after the receiver is powered up, hold the two transmitter sticks in the lower outside corners of the gimbals for a few seconds. The Lemon RX display should become something like this one. 10CH TXT Essential Instructions v1.docx...
- Page 7 The first line with the number indicates what you can change. In this case the response direction of the Ailerons. The rest of the lines are the same as the basic Lemon Text Display and show the current settings. change the value of the item displayed on the first line by moving the Elevator stick fully up or down.
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Page 8: Step 5: Using Stabilization
Given the dual diversity antenna setup of the Lemon receiver, a satellite receiver is not normally required, but can be used if desired for extra signal reliability. It should be well separated from the main receiver. Be sure you can access the three gain pots on the receiver, as you will need to adjust them, perhaps repeatedly. - Page 9 Table 1 shows how the servos should be assigned to the first 8 receiver channels and the corresponding LED display. Channels 9 and 10 can be used for anything. Plug the servos and ESC into the appropriate slots on the receiver.
- Page 10 The diagram shows how the surfaces should respond with a momentary pulse when the model is moved about each axis. When the model is rolled sharply to the right, the right aileron should go down and the left aileron up, briefly, to resist the displacement.
- Page 11 10. Adjust the stabilizer gain pots As delivered the stabilizer gains are normally at the 12 o’clock position. For first flights set the three gain pots at about the 10 o’clock position. This is a good conservative starting point that should produce noticeable stabilization.
- Page 12 By the time you’ve finished the initial flight(s) you should have a good sense of the model’s stabilization behaviour and have achieved flyable basic settings on the receiver. 13. Fine tune stabilizer gain Optimal stabilization occurs when gain on each of the three axes is just below the level where oscillation occurs at the highest normal flying speed.
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Page 13: Using Telemetry
Note that the Lemon RSSI value cannot be directly compared to other signal indicators, such as Spektrum™ or FrSky™ RSSI numbers. Lemon RSSI will read at or close to 100 with the transmitter beside the model and fall as the model moves away. -
Page 14: Factory Reset The Receiver
This is set up using the File Settings item on the Telemetry screen. To recalibrate the receiver’s telemetry to specific voltage and/or current sensors, use screens 14 and/or 15 in the Advanced Screens, and follow the Instructions in the document “Telemetry with the Lemon RX 7 and 10 Channel Receivers”: https://www.rcgroups.com/forums/showatt.php?attachmentid=17692169. -
Page 15: Appendices
TOOLS icon (Wrench and Screwdriver), then select “DSM Smart RX Telemetry”. On the screen that appears, scroll down to TextGen and select it. The LEMON RX screen will then display. With a black and white screen EdgeTX radio the required script file must be downloaded from GitHub and copied to the SD card. -
Page 16: Appendix 3: Understanding Throttle Lock
Note that either R1 or R2 or both must be ON for stabilization to be active. Thus, setting R3 without either Option B or Option C will have no effect. Settings are retained even when power is removed. Once a stabilized option is set, stabilization can be turned on and off in flight by a switch on the transmitter. When stabilization is ON, the green Status LED will be illuminated. -
Page 17: Appendix 4: Troubleshooting Text Display
Your Lemon receiver may not support Setup Mode. Lemon Gen2 Telemetry Receivers produced between April and August 2024 may or may not have Setup Mode, even if they enable Test Display basic screens. Those produced after this do have Setup Mode, but retailers may have had older stock.
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