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At the past i buy the 857d and a new yaesu atas 120.I install them to my car ford focus (petrol) .Τhe more I pressed the throttle the noise grows. I only try good ground to the antenna mount and to the radio , nothing of this helps.I try to find where the noise is coming , i take my kenwood f7 mode ssb and i take it close to my engine , once I approach the gasoline injectors there the noise is coming from injectors.Then i try also other things . I removed the antenna cable form the back of my radio ,no noise at all .I removed the atas form the antenna base mount ,still have the noise and i try also to give power from another battery from my other car (toyota) and having the antenna mount to ford ,still having the noise.Τhat made me lose my patience, and so I sold it.From your experience if i done this the noise had go away?