24

Short answer: Yes, this is very much true. The VTX sends out radio-frequency (RF) energy through the antenna connector and pigtail, and if nothing (or the wrong thing) is connected at the other end, all the energy gets reflected back and could damage your VTX (or at least will heat it up dramatically). Long answer: At high frequencies a thing called "...


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

To answer this question, there are two things you need to know. First you need to be able to map the various channels and bands to their frequencies. Second, you need to understand Intermodulation Distortion (IMD). The quick explination of IMD is that two or more radio frequencies can combine to cause interference on a third frequency. Using the above ...


10

When choosing an FPV camera, there are several things that you need to look out for: Sensor Technology Most modern FPV cameras use a CMOS sensor. These are digital sensors that generally tend to have a higher resolution (measured in TVL or TeleVision Lines) than the alternative, which is CCD analogue sensors. Pretty much every modern FPV camera uses CMOS ...


10

Okay, as someone who has just recently passed through this stage, here's my take on it. Almost all of the considerations below stem from the maxim that the best drone for you is one that you will fly the most. Both progression and enjoyment in this hobby (and many other hobbies as well) are directly linked to how much time you spend doing it. Whenever you're ...


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 ...


10

There's no magic technology, it's just a difference in design goals. FPV drones are designed for speed, performance and robustness, DJI drones are designed for duration and carrying a gimbled camera. Larger, slower turning rotors are more efficient at producing lift but have a lower top speed. That's why helicopters can hover and propeller planes with the ...


9

Your VTX is a high-power RF transmitter. When operating with an antenna, the RF power of the transmitter is radiated out through the antenna. When the antenna is missing, the RF power is reflected from an unterminated antenna port back into the transmitter. This reflected RF energy will be dissipated as heat (best case scenario), or damage/destroy your ...


9

There are several factors that are important for what FPV goggles are right for you: Type The first thing you’ll notice is that there are two main types of FPV goggles: slimline and box. Slimline goggles are usually more expensive, but they are also lighter and many people find them to be more comfortable. Their screens are also smaller, which means that ...


8

FPV is not actually illegal because that document also states: Part 107 does not apply to model aircraft that satisfy all of the criteria specified in section 336 of Public Law 112-95. and the criteria specified in section 336 of Public Law 112-95 is: (1) the aircraft is flown strictly for hobby or recreational use; (2) the aircraft is ...


8

No, you do not require an Amateur licence to use this equipment. Most RC equipment that operates at 5.8GHz (or 2.4GHz) makes use of what is known as an ISM band, a series of frequencies made available for anyone to use (historically for Industrial, Scientific and Medical purposes) subject to certain restrictions - such as transmitter power. These ...


8

let me clarify a few things that may help you decide on direction, if any, to take. Your question is not really something anyone can objectively answer because you need to consider what your level of dedication to FPV is first. And of course rand loyalty is nothing short of a cult like relationship (#kiss) Off the shelf "racing drones" don't exist....


7

I'm going to give you the answer first: Yes, it is worth calculating the approximate range if you're building a (very) long-range aircraft. However, theoretical calculations will usually be such a crude approximation of reality that you can't rely on them, and the actual maximum range will depend on a myriad of factors besides what you can consider in the ...


6

Just about anything will block/interfere with radio signaling if there's enough of it in the path between the transmitter and receiver or in the immediate vicinity of them. (sometimes referrred to as the Fresnel Zone) However, these are some of the most notorious offenders: Tight spaces with a lot of multipath interference Concrete and brick structures ...


5

The rules for operating a UAV in the United States have been in a nearly constant state of flux for the past few years with perhaps the biggest changes coming from the FAA Reauthorization Act in late 2018. One important change that this brought was a legal way to fly FPV thanks to this statement: "The aircraft is flown within the visual line of sight ...


5

I like to set the drone in a window or take it outside. Then adjust the focus while looking through the goggles until I get it where it looks good to me. You may also wish to print out a focus test pattern or follow this detailed tutorial on focusing an FPV camera.


5

There are quite a few aspects of FPV, so a I’ll give a summary here. I’ll try to be concise so if any extra info is required or wanted, please let me know. The first thing to look at when you’re flying FPV is the kind of aircraft, all the way up from a small Tiny Whoop to an X class (please not for beginners though!). In general, the larger props tend to ...


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

A "mushroom" is just a clover-leaf antenna. Generally they have a plastic cover that makes them look like a mushroom, hence the name.


5

Are the rules different around the world? Is a technicians class amateur radio license sufficient? What about the requirement to transmit your call sign every 10 minutes? Is that necessary in this use case and if so, how do you comply? Addressing this specifically, just in case you decide to get your ticket for the purpose of flying (and many people do!). ...


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

This is a good question. In short, While DJI drones certainly have a lot of engineering and design put into them, the way they achieve long flight times is no secret. The DJI drones' long flight times are largely due to the high capacity batteries, motors, and propellers used. Although, there are many smaller things that also affect flight times. Probably ...


5

Short answer The standard is that pulling the elevator stick backwards lifts the front of the quad, the same as an airplane (pull up). This is the same regardless of LOS/FPV/otherwise. Longer answer REalistically, whatever works for you is fine. Back in the days before electronic reversal, people would notoriously learn with the elevator backwards (this is ...


4

Here is my advice for getting started in FPV. Step 1: Get a Radio, Fly a Simulator The first step is to buy a quality radio. Pilots who are used to video game controllers might like a FrSky X-Lite or TBS Tango 2 while others may prefer the FrSky Taranis Q X7. While FrSky radios are the most popular, there are also other great options like the Jumper T16, ...


4

I just want to add to FlashCactus's excellent answer... Depending exactly what you want, you can get some fairly good estimates on range on various range calculators online. You can get them pretty easily from Googling "Calculate FPV range," but here are a couple: FPV.lt MaxMyRange.com Of course, I concur with FlashCactus... it's not a perfect no-...


4

I fixed it by adding a common ground between the 5v regulator and the flight controller. I can't explain the science behind this, but I took the answer from this video from Painless360 The flickering is completely gone, even when I punch the throttle. New wiring diagram: EDIT: I will leave the post unanswered until someone intelligible explains this, and ...


4

Some brand-name antennae actually have the word "mushroom" in their model name. In common parlance, though, unless the model name is spelled out fully (such as "VAS Mad Mushroom"), it can refer to any omnidirectional circularly-polarized antenna that has the characteristic mushroom shape. The radiation pattern of such antennae is usually what you'd ...


4

There’s a lot to unpack here, so I’m going to give a general kind of advice that should be helpful for anyone trying to get cleaner video: Electrical Power There are two main aspect to the image transmission: the camera and the VTX. Whenever you have noise, the first step would be to increase power filtering as much as possible. The easiest way to do this is ...


4

TVL (TeleVision Lines) is a measurement of the "resolution" of an analog camera. Digital video systems use pixel resolution to specify how many pixels wide and tall the image is (e.g. 1080p = 1920 pixels wide by 1080 pixels tall), but analog video systems don't technically have pixels so there has to be some other way to represent their resolution ...


4

This is done by placing streaming video data (RTP) directly into the Wi-Fi frames. Checkout https://github.com/svpcom/wifibroadcast/ project for more details.


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