With the amendment to the law §23 StVO 2017 (“Handyparagraph”), it will be necessary to operate radio equipment (amateur radio, CB radio) without using a handheld microphone from July 1st, 2020 in Germany. In other countries, similar laws exist already.
Nearly all current vehicles and retrofit car radios have a hands-free feature for mobile phones, where the phone is connected wirelessly to the vehicle using Bluetooth. The vehicle loudspeakers and the built-in microphone are used for communication with the other party.
In order to enjoy the same comfort also with the HAM radio/CB transceiver, bt-trx offers the possibility to connect with the vehicle as easily as a mobile phone. No modifications to the vehicle are necessary, simply connect bt-trx instead of the hand mike.
bt-trx is an Open Source project, which means all data for hardware and software are freely available under an open license.