As I mentioned in a previous topic, the usage of the simple cables between the handheld transceiver and Android device is not always a 100% reliable solution, mainly because some Android devices can not be configured to "accept" audio signals on their MIC input or, if accept, they have an unwanted behavior (e.g. start the music player).

For this reason, and taking the advantage of the bluetooth option provided by APRSdroid software, I decided to try to transform a bluetooth headset in a small interface between Android phone and the VHF transceiver. I choose a cheap earpiece (around 7 EUR) available on local market (LAZER Auriclar Bluetooth), the only special thing on it being the multipoint feature. This is not mandatory, the only reason being that such a feature are available on a newer bluetooth modules.

Carefully unscrew the earpiece case and identify and unsolder the wires for input (thos…