Re: Bluetooth connection and range
It depends on the device and the area. There are 3 classes of Bluetooth:
Class 1 is 100mW, and the range is about 100 meters in clear air.
Class 2 is 2.5mW, and the range is 10 meters.
Class 3, like headsets, is 1mW, and the range is 1 meter. That's in clear air. If the phone is in your left pants pocket, and the earphone is on your right ear, that's about 3/4 meters through human muscle tissue, and WAY past the range of a 1mW 2.4GHz signal.
If you want more than 20 feet (just over 6 meters), you need a Class 1 device. Since car radio BT is designed for a phone that's inside the passenger compartment, and usually pretty close to the radio, it's probably a Class 3 devide. Maybe some of them are Class 2. But that's through plastic and surrounded by metal, so the range would be less. Once you get outside the car (how else do you get 20 feet from the car audio system), you're talking about getting signal through a conductive enclosure - not something BT (or wifi) is designed for.
The problem is mainly that you're trying to use a system for something FAR exceeding its design specs. (Maybe your Note 3 had an exceptionally sensitive receiver - the sensitivity still varies from chip to chip - and probably isn't one of the things measured under exceptional conditions, which is what you're doing. [The sensitivity can fall off a cliff at one point, so if you're one inch too far, you go from good signal to no signal with digital signals. The measured sensitivity - wire to the radio - can be fine, but the sensitivity at twice the design spec can be nil.])
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