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Jan 04, 2020, 06:09 AM
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The official Lemon 2020 receiver thread - NEW USERS read first 8 posts. :-)


Purpose of this thread

This thread is to provide a place for support and discussion about Lemon receivers in general. Specialised products such as the stabilisers will continue to have their own dedicated threads. This thread replaces the original “Lemon DSM2/DSMX Compatible Receivers” thread which was started in 2012, has over 12,500 posts, and contains lots of information about now obsolete units.

We will update the first 8 posts of this thread over time to contain important summary information and links.

To be completely clear - this thread is created and supported by two users on RCGroups: jj604 and Daedalus66. We have no connection with Lemon beyond our correspondence with the chief engineer, FMak2, and our participation in testing of new products. We just like Lemon products and want to help other users get the most out of them.

Disclaimer: DSM2™ and DSMX®️ are registered trademarks of Horizon Hobby Inc. Lemon receivers are original designs using different hardware components. There is no suggestion that they are copies of genuine Spektrum items. The terms "DSM2” and “DSMX" in this thread are understood to be a shorthand to mean an item made by Lemon that is compatible with a transmitter using the Spektrum DSM2™ and/or DSMX®️ data protocols. “DSMP” is a proprietary protocol created by Lemon RX which has additional functionality but is capable of backwards compatibility with the DSM2™ and DSMX®️ protocols.


Why a new thread?

Lemon undertook a major redesign of the radio frequency board of all their receivers during 2019. They have quietly replaced most of the legacy units with superior performing ones but with unchanged functionality so that users were largely unaware of the change. This was triggered by the unavailability of the CYPRESS consumer 2.4GHz chip set on which both Spektrum and Lemon based their legacy designs. Spektrum chose to move to a TI CC2650 combined microprocessor and RF chip while Lemon chose a completely different chip from a different vendor. This design is called a Software Defined Receiver or SDR and is completely defined by the firmware that is loaded into the chip. Lemon solutions were always completely original and not in any way a copy of Spektrum designs – now they don’t even use the same hardware components. Both the new T series Spektrum receivers and all current Lemon receivers benefit from the dramatically improved performance and smaller die size of the much more modern combined chips.

At the same time Lemon chose to rationalise their product range, which had grown in a somewhat haphazard manner, and have eliminated a number of unprofitable products and all of their obsolete DSM2 only offerings.

What is available going forward?

From January 2020 there is a more rational set of receivers and stabilisers on offer. In addition, Lemon will be adding some new products to the range.

We have summarised what is on offer – and what has been discontinued but which many people will still have in regular use - in the “Receiver Comparison” table attached. We (Daedalus66 and jj604) will keep the table up to date as availability of products changes. Note that some items may be included that are not yet available for purchase. If the price is stated as TBA you can assume we have at least seen a picture of a prototype and are confident that the specifications in the table are realistic. If we have not yet seen a picture of an actual prototype (like, at the time of writing, the widely anticipated 10 channel telemetry-enabled stabilized receiver) then it is not included. In addition, there may well be some products still available on the web page which are in the discontinued category in the table. While stock is available you might want to stock up on items that serve a particular purpose but are being discontinued, such as the stand-alone telemetry system LM0030.

As always, don’t ask us about availability or price of future products. That’s Lemon’s business and we have learned to be cautious about predictions.

What has changed (summary).

1) ALL DSM2-only compatible products are discontinued. This includes:
  • The Microlight and Featherlight 6 channel range. LM0025, 0026, 0019, 0021, 0023. Replaced by the 6 channel DSMP receiver. Available in top pin, end pin and pinless versions. You get a much better long single flexible antenna, full user set fail-safe and better range for very little money.
  • The 8 and 10 channel DSM2 compatible receivers. LM0015, 0016, 0017, 0018
  • The DSM2 satellite. LM0001
2) The 8 channel PPM is discontinued. LM0039 and 0007.
3) The non-diversity regular stabilizer with the short wire antenna is discontinued. LM003, 0032, and 0004. Diversity antenna versions will remain in production.
4) The non-diversity Stabilizer Plus with the short wire antenna is discontinued. LM0042. Diversity antenna versions will remain in production.
5) The stand-alone Telemetry system LM0029 and 0030 is discontinued.
6) The LM0041 7 channel telemetry receiver with PPM out is discontinued.

Are Lemon products any good?

When the first Lemon receivers appeared on the scene some people dismissed them as typical poor quality Chinese copies and of course made jokes about the name.

Lemon proved that they were no joke. They are a small company (think Baseball or Cricket team size) run by an enthusiastic and dedicated engineer who loves model flying.

They have their own manufacturing plant emphasizing high yield but very high precision placement and soldering of parts. They do not rely on a partnered manufacturing firm and Lemon’s CEO and chief designer (FMak2 on RCGroups) prides himself on their quality. The production plant is BSI ISO9001:2015 qualified and contains a complete SMT production line including wave soldering, moisture-controlled storage, CNC machines, and a full RF testing facility.

Every receiver unit made since 2012 has been made on the in-house SMT production line and individually tested by the staff. Only plastic case molding is outsourced. It is fair to say that since that time Lemon have established a serious reputation for performance and quality at low cost, as well as a very responsive attitude on the rare occasions when something goes wrong.

Links to other threads:

Lemon Instructions for all products.

https://www.rcgroups.com/forums/show...s-thread/page1

The old Lemon Receivers thread (contains lots of useful information)

https://www.rcgroups.com/forums/show...eceivers/page1

The Lemon telemetry thread


https://www.rcgroups.com/forums/show...m-thread/page1

The regular Lemon Stabilizer thread.

https://www.rcgroups.com/forums/show...-posts-)/page1

The Lemon Stabilizer Plus thread

https://www.rcgroups.com/forums/show...s-thread/page1

The Lemon Transmitter module thread

https://www.rcgroups.com/forums/show...-FIRST-4-POSTS

The Lemon Micro receiver thread

https://www.rcgroups.com/forums/show...-first-6-posts

Attached is the “Lemon Receiver Comparison” document.
Last edited by jj604; Jul 17, 2021 at 02:31 AM. Reason: Updated Receiver Comparison Chart to latest (July 2020) version
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Jan 04, 2020, 08:46 AM
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Eagerly awaiting the new 10ch Stabiliser with Telemetry
Jan 04, 2020, 09:54 AM
65 years of RC flying
Daedalus66's Avatar

The official Lemon 2020 receiver thread - NEW USERS read first 8 posts. :-)


So are John and I. We hear that development work is progressing well. The rationalization of the product line that this thread reflects will clear the way for a greater focus by Lemon on new receivers.

In readiness for the new thread, I spent some time last night going through the first few months of the old Lemon Receivers thread. That thread was launched in late 2012, when Lemon had recently started up and had just announced a special on the DSM2 Feather Light receivers — five for the (very low) price of four. There was initial skepticism, and joking about the name, but it didn’t take long for the new receivers to gain respect for their build quality and good performance. I ordered several batches to use in a club combat event featuring Flite Test Spitfires. Many of those receivers are still in use.

Now, as Lemon adjusts its product line to eliminate DSM2-only receivers, it’s interesting to read the discussion of a few years ago about whether Lemon should bother to develop DSMX-compatible receivers. For quite a while, people argued that DSMX offered little real advantage and that DSM2 was all anyone would ever need, unless they flew in events with many other transmitters operating simultaneously. That debate is over and the robustness of the DSMX protocol won. But I still use Spektrum DSM2 receivers purchased in 2007 and Lemons from 2013.

For many users, the iconic Lemon receiver remains the Seven-channel Stabilizer (and the later StabPLUS). Most of my smaller models (and some bigger ones) now have a Lemon Stab, and I always fly them in Gyro mode. When I go back to flying without stabilization, I really miss the smoothness it brings.

Here’s to the coming ten-channel stab (with telemetry and maybe eventually other features)!
Last edited by Daedalus66; Jan 07, 2020 at 08:44 PM.
Jan 04, 2020, 10:16 AM
Registered User
This thread is a remarkable labor of love by jj604 and Daedalus66, for which many thanks. I have just received a shipment of the new six channel end pin and no pin receivers. To the extent that the naked eye can tell, they are beautiful, tiny works of art.

AND the new micro light brick looks very interesting for RC conversions of the many classic rubber power scale designs.
Jan 04, 2020, 10:48 AM
Registered User
Radikal's Avatar
Quote:
Originally Posted by jj604
Lemon proved that they were no joke. They are a small company (think Baseball or Cricket team size) run by an enthusiastic and dedicated engineer who loves model flying.
He loves cloning other receivers, if he ever creates his own radio I will then consider him an enthusiast.
Jan 04, 2020, 11:04 AM
Old's Cool
Radikal, FWIW, these receivers are not clones.

Thanks to jj604 and Daedalus66 for continuing to provide best in class documentation and support for the Lemon products.
Jan 04, 2020, 01:36 PM
If it floats....sail it!
FoamCrusher's Avatar
I too purchased one of the 6 channel “value packs” soon after they were released after loosing planes to Orange brand Rx’s. The Lemon Rx’s performed so well I have never purchased anything else. They have gone into all of the RC sailboats (suitability coated) I have built and sold and to my knowledge all are still functioning.

I’m looking forward to what they come up with next. Maybe Tx at some point???
Jan 04, 2020, 02:16 PM
65 years of RC flying
Daedalus66's Avatar
Quote:
Originally Posted by Radikal
He loves cloning other receivers, if he ever creates his own radio I will then consider him an enthusiast.
Burnooly is right. There’s nothing of the clone about these receivers. They are totally original creations. This is especially clear when we get to the new SDR receivers, which use completely different hardware from either the old Cypress-based receivers or the new Spektrum line. They are a product of long development and much testing.

It’s the enthusiasm of FMak that drives Lemon.
Last edited by Daedalus66; Jan 04, 2020 at 03:25 PM.


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