14 votes
Accepted

What are 'Modes' of a transmitter / controller?

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 ...
Kralc's user avatar
  • 6,036
12 votes
Accepted

Can circularly and linearly polarized antennae be used together for FPV?

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: (...
ifconfig's user avatar
  • 5,998
12 votes
Accepted

What is the advantage of SBUS over IBUS?

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 ...
bingo-fuel's user avatar
10 votes
Accepted

USB Webcam Parts for FPV?

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 ...
FlashCactus's user avatar
  • 2,997
9 votes
Accepted

Why is 900 MHz better for long range than 2.4 GHz?

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 ...
ifconfig's user avatar
  • 5,998
6 votes
Accepted

How are Hall effect gimbals different than standard gimbals?

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 ...
ifconfig's user avatar
  • 5,998
6 votes
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Is it feasible to use an RC car transmitter/receiver to control an RC plane?

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 ...
ifconfig's user avatar
  • 5,998
6 votes
Accepted

Should VTX ever be lower freq./higher power than the control transmitter?

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 ...
Robin Bennett's user avatar
6 votes
Accepted

Brushless Upgrade for RC Car

The important points are: The physical size. One of these is labelled 'BL3650', which probably means that the can is 36mm diameter and 50mm long. Of course, it doesn't have to be exactly the same ...
Robin Bennett's user avatar
5 votes

Why is 900 MHz better for long range than 2.4 GHz?

Besides the purely physical considerations listed in ifconfig's answer, there's another reason, and it has nothing to do with frequency, but with how the signal is encoded and decoded. The Crossfire ...
FlashCactus's user avatar
  • 2,997
5 votes

USB Webcam Parts for FPV?

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.
Bambusgott's user avatar
5 votes
Accepted

Taranis X9D Plus 2019: Switches SE,SF,SG,SH, and SI are not working/responding on Betaflight

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 ...
DroneDome's user avatar
  • 567
5 votes
Accepted

First radio transmitter. Taranis X-Lite, X9 Lite or Jumper T8GS?

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) ...
Flyback FPV's user avatar
5 votes
Accepted

How do I test if my DX5e antenna is still good?

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 ...
Robin Bennett's user avatar
5 votes

Is it feasible to use an RC car transmitter/receiver to control an RC plane?

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 ...
Robin Bennett's user avatar
5 votes
Accepted

Binding DX5e (or any other hobby controller) to generic "toy" drone - protocol compatability

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 ...
bingo-fuel's user avatar
5 votes

Good beginner 6-ch radio with configurable controls under $80

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 ...
ifconfig's user avatar
  • 5,998
5 votes

Good beginner 6-ch radio with configurable controls under $80

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 ...
Robin Bennett's user avatar
5 votes
Accepted

Can't disable SAFE or change SAFE mode

I found a solution the next day. I noticed that while holding down the panic button (A button on the transmitter, channel 6), I appeared to have full control of the controls. This led me to realise ...
ThatCoolCoder's user avatar
4 votes
Accepted

r-xsr won't bind to qx7s

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.
Hannes Hultergård's user avatar
4 votes

What do I need to do to get OpenTx 2.3.X to include D8 on a Taranis QX7 model?

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 ...
Drones and Whatnot's user avatar
4 votes

Why is 5.8ghz used for FPV and 2.4ghz use for transmitters?

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 ...
FlashCactus's user avatar
  • 2,997
4 votes
Accepted

Why is 5.8ghz used for FPV and 2.4ghz use for transmitters?

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 ...
ifconfig's user avatar
  • 5,998
4 votes
Accepted

What is the background of remote controller modules?

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 ...
Jim OHalloran's user avatar
4 votes

What is the background of remote controller modules?

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 ...
Hannes Hultergård's user avatar
4 votes
Accepted

In what direction should I orient the dipole antenna on my 2.4 GHz RC transmitter?

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 ...
Kralc's user avatar
  • 6,036
4 votes
Accepted

Does anyone have a manual for this radio?

So the radio arrived, and I plugged in some servos and a motor and here's what I think everything is; Ch1 is rudder, right stick right+left(I think, there was something weird with it) Ch2 is elevator, ...
Ceramicmrno0b's user avatar
4 votes
Accepted

Does the RC transmitter control power consumption?

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 ...
Robin Bennett's user avatar
3 votes

Can circularly and linearly polarized antennae be used together for FPV?

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 ...
FlashCactus's user avatar
  • 2,997
3 votes

USB Webcam Parts for FPV?

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 ...
radimklaska's user avatar

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