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Servo Reversers and Spektrum
We continue to be contacted by customers regarding the compatibility of our Servo Reversers with Spektrum receivers. After talking with these customers individually, I decided that it might be good to address the issue here, to answer some who may be wondering, but who have not yet reached out to us.
It appears that some modelers have experienced problems when using certain reversers (not ours) with Spektrum radios, and I understand that a spokesperson from Horizon has suggested in various RC forums that reversers of any kind should not be used with Spektrum receivers, as they create some type of interference that can disrupt the receiver's operations, even though they are operating on the 2.4GHz band, which is supposed to be much less susceptible to EMI or RFI interference.
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I'm not sure which reversers have actually been causing problems, but I do know that we have been providing servo reversers for several years now to users of every brand and type of radio system out there, and we have received absolutely ZERO reports of problems or incompatibility with any brand of radio, including Spektrum.
Electronically, there are several ways that the PWM signal used to control a servo can be produced, and it is very possible that some reversers being made overseas use a design that is faulty, and that indeed creates interference. Our reversers, as well as most of the other circuits we make, like Navigation Lights, Servo Speed Reducers, Servo Testers, etc., all use a microcontroller to create the PWM signal, and they do not produce any interference of any kind. There are thousands of our devices in use in models around the world, including reversers, and we've never received a complaint about a single one being non-compatible.
Our reversers "read" the signal from the receiver, do some math on it to switch it from one side of the channel's center to the other, and then send it back out to the servo, all done in a few microseconds! They can be safely used in Spektrum systems. -David
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News from the Bench
One of our most popular products is our line of Gear Door Sequencers that allow you to control both a retract controller and one or more gear door servos using a single Rx channel. Until recently the range of the gear door servo(s) was "hard coded" into the programming, which meant that any adjustments to the movement of the servos had to be done mechanically. But we have recently figured out a sneaky way to import the channel end points from the transmitter and pass those on to the gear door servos, making these sequencers much easier to set up and use.
Beta testing on the prototypes has proven the programming to be solid, so we are incorporating this new programming into all our sequencers as of this date. The circuit boards (and prices!) have not changed, just the programming.
This same programming technique has also been incorporated into our Drop-Down Landing Light circuits, including our newest kit that is detailed in the article in the center column of this page. Check it out, and let us know if you have any questions about this newest feature.
We're always looking for new ways to make our products perform better and make your flying more fun!
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Drop-Down Landing Light Kit Legend Hobby OA-1K & Air Tractor
We are happy to introduce a couple of new products we have developed specifically for the new Legend Hobby OA-1K Skyraider II ARF and the Legend Hobby AT-802A Air Tractor ARF. First is a kit that provides everything you need to install Drop-Down Landing Lights into either of these models (or any other model that features a drop-down panel in the bottom of the wing). The kit contains everything you need, including a 3D printed plate that mounts on the wing bottom to create the panel itself, the cup that holds the landing light and drops down out of the opening in the plate, the servo that rotates the cup up/down, and the circuit that plugs into the receiver and provides the signals to rotate the servo and turn the light on/off. Also included are the servo arm and control rod, the servo extension (36") to connect the servo to the control board, even a reflector mounted inside the cup to amplify the light output!
The kit can be ordered in a single unit (left or right), for models that require only one light, or in a dual-light kit that includes a left and right mirrored pair for scale accuracy. Currently it is available in either White or Light Gray, for other color choices give us a call. The single control board can control both servos and both lights, so you only need a single receiver channel for both lights. Check the Product Page for more details.
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The second new product is the Legend Hobby AO-1K Skyraider II/Air Tractor NavLights also developed for the Legend Hobby ARFs listed above, it includes wingtip navigation lights (red/green), two asynchronous wingtip strobes (white), a solid tailcone light (white), and a pair of landing lights for the nose cone. The circuit features the option to set the landing lights to a normal "on/off" pattern that is scale for the Skyraider II, or a Wig-Wag pattern that is scale for the Air Tractor.