Choosing the right radio

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Choosing the right radio

Postby biomecanoid » Sun Nov 10, 2013 2:27 pm

Hello guys

I am planning on building a foam UglyStick for FPV and am i starting researching on suitable hardware starting from the most crucial part which is the radio.

It is imperative to find a correct radio because it costs omething like 1/3 of the project and you will probably carry it around and use it for many generations of models.

Keeping in mind that an FPV plane uses at least 2 frequencies one for video one for control, i think it is wise that those freq be far apart.

So i am looking for a complete set of transmitter, receiver, etc at 433mhz since this frequency can go further, its good at penetrating through objects and its away from the polluted 2.4ghz band.

So i asked HobbyKing some questions.

According to HobbyKing's support this is a nice setup with all components compatible with each other. Theoretical range is 3 to 5 km @433mw with 100mw output power (there is also an 1 watt version but they currently have it only for futabe radios a JR version is soon to come)


Searching online i found 1watt JR module and programming cable ( better than HK recommended ): ... ng-004.htm ... goryID=105


= $121.35

This is supposed to me a programable radio and NOT plug and play, but this doesnt mean you need manual text coding there is a gui windows program that makes things simple.

What i would like to know from you guys is if my choice of hardware is correct and if you have something better to propose.

i will need your help reviewing and verifying my hardware choices since you have more experience and have tested lots of hardware. So if you bare with me i will be more than happy :P

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Re: Choosing the right radio

Postby cynr100 » Mon Nov 11, 2013 1:15 pm

I use a 2.4gHz for the remote control Tx & Rx, and use 5.8gHz for FPV I have never had crossover/interference issues. I have yet to test my system past 1.5km.

Your choice of Tx/Rx and Vtx/Vrx frequencies should be guided by:

1/ Is the frequency legal to use in your country.
2/ Is it legal to fly FPV in your country.
3/ What distance do you expect to cover.
4/ What terrain do you intend to fly in.

Okay with that out of the road your frequency options are many for Vtx/Vrx rather than spend hours of typing I will give you an example:
Fat Shark goggles with 5.8gHz Vrx and helical antenna, Immersion 25mw Vtx with skew planar antenna for Vtx, average coverage depending on terrain is 5km.

Have a look through this site, doesn't go into minute detail but gives plenty of food for thought.

Also be careful that your FPV system will not out range your Tx control of the craft. Serious consideration should be given to a Stabiliser/Return to Launch system should you loose Tx control of the craft and all the expensive equipment is lost.
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