12

The compatibility of mixed polarity antennae depends greatly. For a little background in RF polarity, this diagram shows the difference between the four main types of antenna polarization available: (mixed/elliptical polarization do exist) (cit.) In general, it is best if the TX and RX antennae match in polarization, but some other combinations are ...


12

The Mode of a transmitter refers to which stick on the transmitter controls which movement on a drone. There are 4 modes (named Mode 1 to 4) but the most common are Mode 1 and Mode 2. The image below shows which control is associated with which aircraft axis, for each mode. The black text refers to fixed-wing aircraft and the blue text is the multirotor ...


10

SBUS and IBUS are both digital protocols and for a digital protocol, you define two voltage values to represent an active state and one inactive state. This is done for every digital protocol. You can specify that 0V is inactive and 1V is active (this is called active high). But you can also define that 0V is active and 1V is inactive (active low). Many ...


10

These four wires are most likely a USB connection, red and black are power, and the other two are USB data. That means you can't use it neither with today's analog gear, like the VTX that you linked to (as it requires an oldschool analog TV signal), nor any of the new and shiny digital FPV systems, like the DJI system (as they use their own proprietary ...


6

The strength of an electromagnetic signal will attenuate (decrease in strength) over long distances between the receiver and the transmitter due to the inverse square law, but this phenomenon applies equally to all wavelengths/frequencies. The main difference in transmission distance capability between long-range RC systems like TBS Crossfire and FrSky R9M (...


6

Maybe! Let's take a look at what parts from the RC car we might be able to reuse for an RC plane. You haven't shared any specific details about the RC car you're looking to salvage parts from or the RC plane you're trying to build, so I'm not able to make a specific analysis. RC Transmitter and Receiver One major concern is how many analog channels the RC ...


5

The difference is in how the gimbal position is sensed and reported to the processor in the transmitter. The two main types are potentiometer and hall effect gimbals, but in both types, the fundamental mechanism holding the gimbal and allowing it to rotate is the same. Potentiometer (aka. pots) Potentiometers are resistors which change their value ...


5

This looks like a typical USB pin connection: +5V, Data- (white), Data+ (green) and Ground. This camera uses a digital signal. Sorry, but it can not be used with a analog video transmitter.


5

The issue was on my Crossfire Nano receiver. I had to change the operation mode from 8 channel to 12 channel. Now switches from SE - SH work. Even though I defined all my knobs, switches, and button on my Taranis, I am limited to 12 channels from my crossfire nano receiver(4 channels for the sticks, 4 for front switchers, and 4 for top switches).


5

At this point I would recommend the radiomaster TX16S. It goes for about the same price as the other radios you list but has everything you need to get you going for a very long time. FrSky (Taranis) is doing everything it can these days to lock you into their ecosystem and you need to start hacking once you are further in the hobby and want to switch over ...


5

That's probably OK, but you should do a range test. All transmitters have a mode that transmits a much lower power than normal, and if that is sufficient to control the model at 30 paces, full power will be enough to fly further than you can see. From page 9 of the DX5e manual: Face the model with the transmitter in your normal flying position. Pull and ...


5

Back in the early days of RC, people only had single channel radios, and vintage models were designed to be flown with only the rudder (and a small amount of fuel in the tank to limit the maximum height). Vintage models were typically high-wing with lots of dihedral and a forward CG to make them very stable. Car RC gear should be fine in this sort of model, ...


5

There are many different communication protocols used for radio controlled models and even for the same vendor the parts/versions are not always compatible. While most use the same chips to build their systems everybody uses a different protocol and so the different parts do not understand each other. Most of the companies do not release official information ...


5

From what I've seen and experienced, the FlySky FS-i6X (or the i6 version for a little less) is the "gold standard" ultra-budget RC radio. I own two (funny story for some other time), and have no complaints apart from some difficulty fine-tuning failsafe parameters for communication with Betaflight. The radio normally sells for ~$50 USD and is ...


5

While ifconfig is right to recommend the Flysky FS-i6 because it has everything most pilots ever need, I should add that the next step up is only just above your $80 price point. The Taranis QX7 and Jumper T8SG are the bottom end of transmitters that run the open source firmware Open Tx. Because the software is free, you get all the (software) features of a ...


4

Okay, I solved it: I had installed the EU version of OpenTX, but I hadn't flashed the internal module on the transmitter. When I did that it worked flawlessly.


4

This depends on your version of QX7. If it is ACCESS, then, as far as I know, there is currently no way to enable D8. If it is ACCST FCC, it should already have D8 enabled by default, so it is unlikely to be this model. If it is ACCST LBT, then when updating the radio, when selecting the features, you can enable D8 mode by selecting the appropriate ...


4

JR was one of the earliest manufacturers (if not first) to introduce the concept of modules on their radios. In the old days of AM/FM radios, the transmitter is built to transmit on a particular frequency band (e.g. 2.4GHz, or more likely 36MHz in those days). Then you could add the capability to work with a different frequency band by clipping a module ...


4

There are multiple purposes for the pins on the back. One of them is to connect an external transmitter module like crossfire, which gives you a longer range. Another use is to flash a receiver with another firmware by connecting it with a servo cable (on FrSky transmitters at least) to the bottom three pins. There are transmitters from several different ...


4

The antenna should be aligned to match the orientation of the antenna on your aircraft; generally this will be vertical, but for more acrobatic aircraft a compromise of 45° might be appropriate for greater reliability but lower performance. For more detail see this question. Some manufacturers of off-the-shelf equipment will recommend an orientation in ...


4

Yes, sort-of. The speed controller switches the motor on and off in very rapid pulses, and the width of these pulses (and the width of the 'off' period) is controlled by the throttle. It's so fast that the motor just sees it as a varying voltage. So if you cut a piece of card and stuck it on the transmitter to prevent full throttle being used, the speed ...


4

There's a few factors that you're missing. The first is that the RC world is dominated by traditional line-of-sight control, and 2.4GHz provides more than enough range to fly a model plane to the limits of vision. There aren't many long range system because few people need them. Even for FPV, long distance flying means a long walk or losing your model when ...


3

To add to ifconfig's excellent summation of how the signal strength would be affected by mismatched polarizations, I must point out that in order to benefit from the reduction of multipath interference offered by circular polarized antennae, both the transmitting and receiving antenna need to be circularly polarized. For more information on how this works, ...


3

Well, the first thing I must point out is that these are far from the only frequencies used for that (and yes, I'm aware that you said "most" in the question). The reason I'm doing that is that answering the question "why do some people not use those frequencies?" can give us an insight into why the others do. Let's begin by listing the "at least somewhat ...


3

As is discussed in this Oscar Liang article, FPV hardware exists for all different kinds of frequency bands, stretching from 900 MHz to 5.8 GHz, with 5.8 GHz being the most popular today. People in our hobby have tried nearly everything under the sun. :) Probably the most well-known tradeoff in RF is that between frequency and penetrating power. In general, ...


3

Simpler and cheaper: No, it looks like a digital camera that needs to be connected over USB. This is not compatible with analog video transmitters. (If you want to save a bit of money look for some tiny whoop all-in-one cam and vtx combos. Those are very cheap with reasonable performance.) If you feel adventurous: You can get a Raspberry Pi, Wifi dongles ...


3

There isn't actually an advantage for SBUS over IBUS in digital serial protocols, and with STM32 F4 processors needing inverter hardware. The frame performance is basically identical, although IBUS does enable an extra 2 channels compared to D16 SBUS (and 10 more compared to D8). There are small budget SBUS receivers that outperform their IBUS equivalents, ...


3

The loose nuts that you hear may be the prop nuts. If this is the case, the props are not held down with enough force and so will be slipping, not providing the torque or the RPM to be able to lift the drone. I would suggest tightening all of the prop nuts and all of the frame fixings and seeing if the issue persists.


3

Another potential cause for not being able to bind is having a different radio firmware on the receiver vs the transmitter module. I recently ran into this issue with some of my setups. The RX was on 2.X.X firmware, which FrSky enabled some minor attempts at encryption to discourage unauthorized receivers and transmitters. This firmware is NOT backward ...


3

This is an interesting idea and I think it could work. There are, however, a few things that are worth considering. First of all, a controller for an rc car will usually have only 2 or 3 channels. This is only a problem if you want more controls such as rudder, elevator, elevons, etc but if you only want to control pitch you will have enough channels. ...


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