This is the default miniquad frequency and the most popular frequency used by the FPV community, this is due to the fact the antennas are small (even the circularly polarised ones), the band is relatively free of interference and it is legal. It also does not harmonic with 2.4Ghz Control Link, so this is a perfect option for mini quads or smaller planes where you are not looking to fly extremely far.
3.3Ghz is a very new frequency that has the possibility of being an excellent frequency for use with our FPV Ships. It potentially offers greater range than 5.8Ghz, without the issues of big antennas and interference with our 2.4Ghz Radios. However, it is still in its infancy, and with only 1 manufacturer producing a huge 1000mW transmitter; which is just a canabalised Partom 1.3Ghz Tx making it prone to unreliability, we are yet to see it really make an impact.
This is a less popular option than 5.8, however it still has its merits. I like to think of it as the best of both worlds, it has a much smaller antenna than 1.3 or 900Mhz, however it still has the improved range over 5.8. But you CAN NOT use 2.4 with a 2.4 control link as they will interfere with each other, you will get significantly reduced range. 2.4Ghz was much more popular in the days of 27mhz, 72mhz and 433mhz radios, when it didn’t interfere. Now however with the prevalence of 2.4Ghz radio systems it is only really an option for medium range FPV flights on a plane. It is also baring in mind that many flying clubs have banned 2.4Ghz FPV due to it’s interference with radio systems and models
This is a great option for those of you who want to fly high and far, given the right antenna setup 1.3Ghz will give you almost unlimited range. Despite this the antennas are very big, especially the helicals and wheel antennas, and you are unable to use it if you are on 2.4Ghz for control, as the second harmonic of 1200Mhz is 2400Mhz, exactly where the 2.4 radio protocols operate. However, this problem can be quickly and easily fixed through a low pass filter which are cheap and just run in series with the Antenna. Here at Drone Insider we prefer 1.3Ghz for muc our 250+ drone flying due to its’ solid video link and easy implementation. We personally recommend the Partom 800mw set which can be purchased from Banggood, Goodluckbuy and Surveillezone.
Perhaps the least used FPV Frequency of all, 900Mhz offers the greatest range in theory with the drawback of HUGE antennas. Therefore, most people tend to use 1.2/1.3 Ghz if they are going for long range performance. In addition you cannot use 900Mhz Control systems with this frequency. (At time of writing, TBS Crossfire is the only R/C Link that uses 800-900Mhz) which is something to bare in mind. Again with multi-rotors one should never really need this kind of range. It was created for very very long range FPV with a large 2m+ plane.