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Specialist in Multirotor Tech & FPV Equipment

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The Prime is one of our latest FPV video transmitters (VTX) and is our first VTX to boast 40 channels, which include the new 'RaceBand' frequencies. As well as being compatible with the new RaceBand frequencies, the Prime VTX is also compatible with all other 5.8Ghz frequencies, via the 4 more traditional frequency bands (A, B, F, E: 32 frequencies).

For those that don't know anything about RaceBand, here's a bit of info: RaceBand was first pioneered by ImmersionRC to allow more pilots to race together without interferance. Essentially, RaceBand is just another set of 5.8Ghz frequencies, to be specific they are: 5658, 5695, 5732, 5769, 5806, 5843, 5880, 5917. The difference between the RaceBand and the other 5.8Ghz bands is that RaceBand frequencies are more spread out across its band (37mhz separation) thus allowing more pilots to fly FPV together without their video feeds causing interference with each others.

The Prime packs in a lot of channels but it also boasts plenty of power, up to 600mW. Best still, it's output power is easily adjusted at the press of a button. You can set it to 25mW, 200mW and 600mW. This is really a great feature as it means you can use the transmitter legally in places where higher power levels are restricted and yet exploit its higher power offering for greater range when legal to do so. It's also handy for those that race in both outdoor and indoor environments. Indoors it’s preferable to use a lower power level to reduce multipathing (poor signal quality caused by the signal being reflected by obstacles).

Changing channels and power levels is quick and easy thanks to the Prime having two selection buttons and LED indicators. The ability to change channels quickly really comes into its own for professional applications and at drone racing events, when lots of people are operating on the same channel.

The Prime features a beautiful, blue anodized aluminum case that is both lightweight and durable, which will help it to survive the most epic of crashes.

The whole setup is largely plug and play, so you can be up and running in literally a few minutes. It comes with a wiring harnesses and a GoPro compatible video cable, which lets you plug your GoPro straight into the transmitter. The Prime can even be powered straight from your flight battery without the need for a UBEC as it supports a wide input voltage (2-4S). It also has a 12V DC output to power a FPV camera. Finally, the TX uses an SMA connector so it can use the full range of ImmersionRC / Fatshark antennas.


  • RF power output 8 step adjustable (25/50/100/200/400/500/600/800mW)
  • 40 channels / 5 Bands - includes Race Band channels compatible with Fatshark & ImmersionRC gear
  • Frequency range: 5645-5945MHz
  • Intuitive and easy to use buttons and LEDs for frequency/power selection
  • Not affected by 2.4GHz R/C radios
  • Wide operating voltage (6-20V)
  • Provides 12v DC power output for FPV cameras
  • Includes GoPro ready FPV video cable

Compatible RxSkyzone RD40 40 Channel 5.8Ghz RaceBand FPV Receiver

IMPORTANT: Do not turn the transmitter on before attaching the antenna, doing so will permanently damage the board!

Note: Please check with your local authorities regarding the operation of this equipment before you purchase. Regulations on power output, usable frequencies and licenses’ to operate vary from region to region.

  • Input voltage: 6-20V
  • Frequency: 40CH 5645-5945MHz
  • Bands: A B F R E (includes raceband)
  • Transmitting current: 300mA @ 12V
  • Transmitting power: 25 / 200 / 600mW (adjustable)
  • Video Format: PAL/NTSC
  • Connector: SMA Female
  • Size: 37x28x8mm
  • Weight: 12g


  • Band A: 5865, 5845, 5825, 5805, 5785, 5765, 5745, 5725
  • Band B: 5733, 5725, 5771, 5790, 5809, 5828, 5847, 5866
  • Band E: 5705, 5685, 5665, 5645, 5885, 5905, 5925, 5945
  • Band F: 5740, 5760, 5780, 5800, 5820, 5840, 5860, 5880
  • Band R: 5685, 5695, 5732, 5769, 5806, 5843, 5880, 5917


  • 1 x Transmitter (TX) 
  • 1 x Video / Power Cable for Gopro 3
  • 1 x DIY Cable (JST Power Connection)
  • 1 x 5.8Ghz 2db Antenna

None Available


By P (not verified) on


Is this transmitter compatible with  Firefly 6s.




By admin on

Hi Paul, sorry for the slow reply, I missed your question. Yes it is P-N-P compatible. 

By Eric Warwicker (not verified) on

I haven't powered it up yet, but I'm impressed with the appearance and quality.

Q1. What is the pinout on the 8 pin socket? (I can see the video and power pins)

Q2. Is the switching between PAL and NTSC automatic or preset to PAL?


Eric W.



By admin on

The pin connections are labelled on the back of the box. Pin 8 is the power in (6-20v). Yes, switching is automatic.


By Mick Cayton (not verified) on

My pin 5 is white. Pin 6 is yellow. This makes white pin 5 video and the yellow pin 6 audio.

Which is correct, the pins or the colour?

Normally yellow is video and white is audio.



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FPV equipment and advice: If you like multicopters, you are more than likely going to like FPV flying. Most people dream of piloting an aircraft for real, well with an FPV setup you can actually place yourself in the cockpit (well sort off)! FPV stands for First Person View – it’s achieved by mounting a camera on your multirotor and broadcasting a live video feed so that the pilot on the ground sees the flight from the aircraft’s view. 

When it comes to selecting FPV TX / RX equipment you will soon discover that there is a huge selection to choose from. However, a word of warning; not all of it will be legal to operate in the UK. Only certain frequencies are freely available to use and furthermore there are constraints on transmission power levels. 2.4Ghz video equipment is legal, however most radio control equipment utilizes the 2.4Ghz spectrum and consequently when used together there will be interference. This leaves only one credible option, the 5.8Ghz band, which incidentally is a very clean band due to the low amount of other users. The drawback is its poor penetrative ability; buildings and even trees can have an adverse effect on the signal strength. This means it’s advisable to use it for line of sight (LOS) flying only.

This brings us onto power constraints. In the UK, you are limited 10mw of transmission power on 2.4Ghz and 25mw on 5.8Ghz. Contrary to popular belief, an amateur radio license (HAM) does not exempt you from the power restrictions for airborne use. While you may have seen transmitters with higher power ratings - 200mw is popular, these are not legal to operate in the UK for FPV. You might be wondering why the power level matters anyway? Well, more power gives greater range. However, it’s not that simple; to double the range you have to quadruple the power! Therefore simply buying a very powerful TX to achieve great range is not an especially effective or legal solution.

The best way to achieve greater range is by selecting appropriate antennas. There are a variety of different types; each designed to work slightly differently, for different purposes. Therefore, in order to make the best selection you need to understand how they work.

Most transmitters / receivers come with an omnidirectional, 2.14dbi gain “Rubber Duck” antenna as standard. The key terms to understand here are omnidirectional and gain. Omnidirectional refers to the radiation (or received) pattern of the antenna. Gain on the other hand refers to the antenna’s directivity. To better understand, you can make an analogy with different light sources. If you have a light bulb out in the open, the light will go in every direction, but it will not go very far (this is your omnidirectional low gain antenna). If you take that light bulb and put a reflector behind it, the light will be directed more brightly and much further but in a narrower beam (this like a directional high gain antenna). Radio power works in the same way, you will never get "extra" power from an antenna, but you can direct the radio power where you need it, and it will be many times stronger.

The best thing about increasing the gain of your receiver antenna is the effect it has on your range. For example, if you were to replace your standard 2.14dbi omni antenna with a 17dbi helical antenna you increased your receiver dbi by ~15dbi. 15dbi divided by 3 gives us 5 times the range you think. Well no, 3dbi gain doubles your distance; another 3dbi on top doubles your new distance. So by increasing the gain from 2dbi to 17dbi actually increases the range by 32x its original distance! All this without increasing the TX power at all!

Because high gain directional antennas work by taking power away from some areas, and focusing it in other directions, they need to be aimed,  otherwise your multirotor will fly into weak spots and your video link will be lost. Remember that the higher the gain, the narrower the beam of radiation and hence the greater need for precise aiming.

If the multirotor is far away from you, aiming will be easy, as its position in the sky will change slowly. If it’s close, it is much harder to keep the antenna aimed. The solution is a diversity system. A diversity receiver has multiple video antennas and automatically chooses which antenna is receiving the best signal at any moment. This allows you to have the best of both worlds; you can have a long range directional antenna that you aim when your multirotor is far away (for example a high gain helical antenna), and also a omnidirectional antenna that only works close, but does not need to be aimed for instance a low gain skew planar wheel antenna).

If it are still stuck, then watch this video - it's an excellent layperson's guide to understanding the relationship between range and gain.

If you want a more in detailed explanation watch this video - it will help you understand polarization and also select an appropriate antenna.

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