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Finally, a PPM solution for Spektrum users! Lots of flight controllers are compatible with PWM, PPM and SBus, but not with DSMX or DSM2, which is the modulation used by Spektrum radios. This Lemon RX receiver uses PPM and is compatible with DSMX and also backward compatible with DSM2 transmitters. PPM makes for a really neat installation, as it only requires one input for all of the channels, instead of a wire for each channel like traditional PWM does. If you are using a Naze flight controller, by using PPM it leaves most of the input channels free, these can then be reassigned to other things like GPS, OSD and telemetry.
The Rx has diversity antennas, which can be positioned differently to help ensure a secure, and reliable connection. It's a full range receiver so range shouldn't be an issue, but in the unlikely event that you do lose signal, the Rx also supports a failsafe. Without a failsafe, if RX signal is lost the last signal command continues i.e. full throttle! With a failsafe you can configure it to default to a zero throttle, so at least your drone will crash-land rather than flying off into the distance.
The receiver weighs in at only 2.7g and it's barely bigger than a postage stamp, so you should be able to use it with even the smallest of racing drones.
Unlike some Spektrum compatible products, Lemon Rx products aren't inferior to Spektrum products in terms of performance or reliability.
- Spektrum DSMX full range receiver with PPM
- True diversity dual antennas with independent processor for monitoring singal on both antennas
- Antennas extended for carbon fuselage / metalic structure installation
- FailSafe supported
How dual antennas work
An independent processor monitors an incoming signal and choose the appropriate antenna for reception. This allows 2 different locations for installing the antennas along with different orientation. Satellite is no longer needed for receiver diversity. This greatly reduces weight with increased overall reliability in comparison to the use of a primary receiver with satellite receiver.
1) Plug bind plug to the receiver.
2) Provide power to the unit.
3) Enable bind mode in transmitter and ensure distance separation of 2 meters from receiver.
4) Upon successful binding and if FailSafe do not wish to be set, remove bind plug upon binding.
Setting Failsafe (see video)
1) Insert bind plug into the receiver.
2) Power on transmitter and receiver.
3) Set transmitter controls to the desired failsafe positions.
4) Press the side push button to memorize failsafe settings.
5) Observe that the green light at the end of the receiver turns on to indicate failsafe is set. (Repeat step 4 will cause the LED to turn off which means failsafe is disabled).
6) Remove bind plug.
7) Disconnect the power for at least 2 seconds and then reconnect the power again.
8) Test failsafe by turning off the transmitter.
The PPM pulse sequence is in the following order: Throttle Aileron Elevator Rudder Gear Aux1 Aux2 Aux3
Note: This is not a Spektrum product, nor is it a copy of any Spektrum product. Lemon RX develops its own technology to produce receivers which are fully DSM2 / DSMX compatible. Spketrum, DSMX and DSM2 are the registered trademark of Horizon Hobby, Inc.
Lemon Rx DSMX Compatible PPM 8-Channel Receiver with Diversity Antenna and Failsafe
- Type: DSMX Compatible PPM 8-Channel diversity antenna receiver
- Model No: LM0039
- Number of Channel: 8 (PPM signal)
- Modulation: DSMX Compatible (Also DSM2 backward Compatible)
- Band: 2.4 GHz
- Dimension: 28(L) x 18(W) x 8(H) mm
- Weight: 3.03g
- Voltage Range: 3.45 - 7.2V from Receiver
- 1x Lemon Rx LM0039 (PPM Diversity Receiver)
- 1x Bind Plug
- 1x Adhesive Mounting Pad
Sorry, we don't currently have any product related advice for this item. For general tips, tutorials and help please check out our Multirotor Beginner's Guide. Alternatively feel free to ask us a question.
COVID-19: We are still shipping out orders daily, but have changed our same day shipping cut-off time to 1PM to help cope with demand. If an order is placed after 1PM we will still do our best to ship same day as our daily postal collection is around 4:15.
Please be aware that deliveries with Royal Mail are taking longer to get through. At the moment we are finding it can range from next day to even up to two weeks, with 3-5 days being typical. So if you choose Royal Mail as a shipping method please be patient, shipments aren’t going missing they are just taking a while to get through the postal service. For fast deliveries we recommend choosing DHL.
All information relating to shipping and delivery is stated here. Should you not find what you are looking for, please contact us.
Shipping costs are calculated once items have been placed in your basket during checkout.
UK Postage: Here at Flying Tech we process orders Monday to Friday and pride ourselves on our quick turnaround of orders. If stocks levels allow, we aim to dispatch orders placed before 4PM the same day with Royal Mail. Our cut off time for courier delivery is earlier; orders must be placed by 1PM for next day delivery with DHL and 1PM for next day delivery with APC. A confirmation email will be sent when your order has been dispatched. If you wish to change your order, please contact us promptly, as we won't be able to make amendments once the order has been shipped.
We are partnered with several delivery companies including Royal Mail, DHL, APC and Parcel Force. If you have a special delivery requirement or would like to arrange a shop collection please contact us. For small low value orders our cheapest delivery service is Royal Mail First Class; this service aims to deliver the next working day including Saturdays and it can be sent recorded for extra peace of mind – please note this is not a guaranteed next day delivery or trackable service.
For a guaranteed next day delivery we recommend Royal Mail Special Delivery or one of our courier delivery options. Royal Mail Special Delivery will arrive by 1PM the next day and for an extra fee can be delivered on Saturdays. APC Overnight offers next day delivery with full tracking and a 2hr time slot pre-delivery text notification. DHL is a good option for larger consignments and remote locations such as Northern Ireland and Isle of Man. All high value orders are fully insured and will likely require a signature on delivery.
FREE shipping in the UK on orders over £99 (this is a signed for service and insured to a maximum of £40). Please note that the offer only applies to orders with a total weight under 1Kg and that a few products are exempt from the offer, such as LiPo batteries.
International Postage: We are based in the UK, but ship to most worldwide destinations. Postage rates are calculated by the weight and shipment location, the price is quoted during the checkout. Low value order can be sent by Air Mail, but are not insured. Higher value, heavy goods will be sent with DHL or an alternative courier. Orders shipped outside the EU may be subject to customs charges. These charges are additional to any delivery costs and will need to be paid by the recipient.
For our international customers who require a rapid delivery we off a DHL Express service. DHL Express offers NEXT DAY delivery to most European destinations and a very fast delivery for countries further afield, generally 2-3 days. For country specific estimated transit times, please refer this download.
We reserve the right to modify, remove or add to any of these services at any time. We endeavour to ship all items as fast as possible. If you would like an alternative shipping arrangement to be made please contact us.