How do I change the vtx power setting from 25mw

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My video keeps cutting out and only has a short range, everytime I try to change it it tells me I need to set a callsign which I have no idea what a callsign is.

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Hi, If your quad is a QQ190, this is outlined in the manual available at manual.qq190racingdrone.com.

page 66

First off, you should be a HAM before unlocking.

For more information, visit ARRL.org

Once you have your Ham radio license, you can enter your callsign which will then allow you to change your video frequencies as well as unlock some other features.

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