NOISE FROM ENGINE

Is this a new problem or has it always been there? Does the buzz vary with engine speed? If so then it is likely to be the ignition. I would pull the spark plug caps off the spark plugs and measure the resistance from the contact inside the NGK plug cap to the inside of the other plug lead that is fed by the same coil. You should measure the sum of the resistance of both NGK resistive plug caps, it should be approximately 10k ohms. These plug caps do go bad over time, I have replaced a few of mine now.

Hi Kevin

It is a new problem, I also read in another blog that some usb charging ports put noise and I had just installed one

I thank you, I will check your advice and disconnect the charger I keep you informed thanks

I second the possibility of the noise coming from the USB plug-in adapter.  And it's super easy to confirm:  while you're in the airplane, pull the USB adapter from the Aux plug.  If the noise goes away, you've found your culprit. 

Unfortunately, many of those adapters are complete junk with no noise shielding whatsoever.  I've owned several "no-name" ones that created all kinds of static noise on the radio/intercom. 

The USB adapters that Sporty's sells (the one with the built-in voltage readout, which is nice to have!) seem to be pretty decent, and two different ones I've used have created no radio interferance at all.  Ditto for the Anker USB adapter I purchased from Amazon.  They seem to be pretty well made, and are Apple and Android "certified".

Hello, I already checked the radio, remove the usb charger and confirmed the noise comes from the motor when it accelerates the buzz increases and vice versa when decelerating the noise decreases I will have to check all the ground connections