Portable GPS navigation machine, using FM to launch, a squeaky noise sound, but another fm,But instead of changing the FM, listening to the radio, GPS is charging the car, no noise.
The circuit in the car has interference to it
1 change the frequency, it is best not to be occupied by the radio frequency2 quality problems, exchange it
Change the frequency, it is best not to be occupied by the radio frequency
This is because the launch device, you can look at the current market a lot of similar launch products, such as GPS, plug in cigarette lighter MP3, the price is very cheap, occasionally some expensive. That is, the quality of the launch device is good and bad, cheap poor quality is very unstable, there are noise, but also with the use of temperature changes, and become unstable.
