I am using an external fm transmitter with this device. It work fine without the car power supply to the myfi over the radio. Once the power supply is plugged in it seems to create a background hiss. I have tried this in several vehicles. If you plug directly into a car radio and use the power no hiss is created.
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I have been using the FM method in my car stereo. It stopped working so I tried all kinds of configurations. The only thing that seems to work is to replace the auto adapter (that the MyFi plugs into) and use the adapter that is supposed to be for indoor use. I have tried this, back and forth multiple times, and with the auto adapter - no transmission; with the indoor adapter - works fine. I have tried this unit with two identical auto adapters and neither works; only the indoor one works. What is the explanation for this?
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