Radio Frequencies

27MHz Band

These are illegitimate radio frequencies for all the drone traffic out there. So, never ever think about using it.

Why is 35MHz Band one of the best radio frequencies?

This is the most commonly used frequency band in the drone FPV world and offers the benefit of long range which can be as long as 1 mile with conventional FPV gear.|

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The drawback associated with these radio frequencies is that other pilots may accidentally hop onto it which will result in interference and hence your drone will come crashing down. It is prudent to keep track of channels assigned to all the pilots in your surroundings.

Here is a list of channels and their associated frequencies.

Channel 55	34.950	Channel 67	35.070	Channel 79	35.190
Channel 56	34.960	Channel 68	35.080	Channel 80	35.200
Channel 57	34.970	Channel 69	35.090	Channel 81	35.210
Channel 58	34.980	Channel 70	35.100	Channel 82	35.220
Channel 59	34.990	Channel 71	35.110	Channel 83	35.230
Channel 60	35.000	Channel 72	35.120	Channel 84	35.240
Channel 61	35.010	Channel 73	35.130	Channel 85	35.250
Channel 62	35.020	Channel 74	35.140	Channel 86	35.260
Channel 63	35.030	Channel 75	35.150	Channel 87	35.270
Channel 64	35.040	Channel 76	35.160	Channel 88	35.280
Channel 65	35.050	Channel 77	35.170	Channel 89	35.290
Channel 66	35.060	Channel 78	35.180	Channel 90	35.300

Now, let us share with you how you can identify the correct channel number of an untagged crystal:

If the crystals describe the frequency but not the channel then how can you identify the accurate channel?

You can do a bit of math to figure out the exact channel.

If the crystal is market with 34._ then simply subtract 40 after the decimal point. For instance, if the crystal is market with 34.950, then subtract, subtract 40 from 95 which will leave you with 55 and this is the assigned channel.

If the crystal is marked with 35._ then add 60 after the decimal point. For instance, if the crystal is marked with 35.180, simply add 60 to 18 and we will get 78 as our assigned channel. Similarly, if we have 35.240, then by adding 60 to 24, we get 84 as our designated channel.

A sticker portraying approval or official CE marking is required for all gear working at 35MHz frequency. If you own a 35MHz equipment and do not have any markings on it, it will be considered illicit to be used in the UK.

2.4GHz Band

This is a handy choice of band and is being widely used in the drone world. It offers decent enough range and does not create any troubles even when you are flying with your fellow dronies. The 2.4GHz band makes use of the Frequency Hopping Spectrum Spread Technology (FHSS) which implies that the output of the transmitter switches between numerous channels by not sticking to a single channel all the time. This prevents any conflict that may take place among different channels. If you own a 35MHz radio and intend to upgrade to the contemporary 2.4GHz radio, it is quite easy. You can buy the 2.4GHz upgrade kit, which blends telemetry connection with your FPV aircraft and lets you keep track of your battery’s life.

Here is an interesting video that discusses frequency hopping technology is simple words.

UHF Band

The 433MHz UHF band is used for long-range flight adventures and can offer a range as large as 25Km while some claiming that they have gone as far as 70Km away.

These radio frequencies band is not legitimate in the UK and is widely used in other countries.

So, you will not be able to purchase any UHF radio controllers from the UK.

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You will need to ensure compatibility with your current radio controller and connect the UHF unit to it. Generally, you need to connect only the power wires along with a PPM signal that allows the UHF system to transmit.

Here is another informative video about long range flights and how you can tinker your system to achieve it.