The go-to tool for configuring your radio from the PC.
Don't use the Chirp from your standard Linux distro, it's likely to be some 3 year old version. Install from another ppa.
TRRS connection on Android phones and Lenovo Thinkpad L580
- TIP : left audio (30 to 40ohm to ground)
- RING1 : right audio (30 to 40ohm to ground)
- RING2 : ground
- SLEEVE : microphone
- sometimes there's a switch to ground in parallel with the mic.
- In case of a Samsung headset, there's a "100ohm resistor in series with a switch to gnd" connected to this pin.