That radio interference might be coming from your cheap USB charger - Appareo

Cheap chargers may carry FCC/CE marks, look safe and legit, but ultimately they can damage your ability to receive and transmit radio communications. This could be as benign as negatively impacting your ability to receive an AM radio station, or as painful and inconvenient as knocking out two-way radio communication completely -- especially if that is your aircraft VHF comm.

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That radio interference might be coming from your cheap USB charger - Appareo

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