Here is the for the QYT KT-8900 (and most QYT/Kenwood clones like the KT-7900, KT-8900D, and BTECH UV-2501) :
For a standard USB-to-TTL (Serial) adapter connection, use the following mapping: Digirig Forum : RX Data (Receive) : TX Data (Transmit) : GND (Ground) qyt kt8900 programming cable pinout top
The uses a 3.5mm jack for programming, typically located at the rear of the radio labeled as DATA . While the port can accept a 4-contact (TRRS) plug, only three connections are required for programming, allowing the use of a standard 3.5mm stereo (TRS) plug. 3.5mm Programming Jack Pinout Here is the for the QYT KT-8900 (and
If you have a spare USB-to-TTL adapter or a broken Baofeng handheld programming cable, you can easily fabricate a functional KT-8900 cable. Materials Needed: Materials Needed: If you connect TX→TX and RX→RX,
If you connect TX→TX and RX→RX, you will get nothing but timeouts.
that connects to the "DATA" port on the back of the radio. Unlike many handheld radios that use dual-pin connectors, this mobile rig relies on a simple three-wire serial interface for data transfer. 🛠️ Programming Cable Pinout (3.5mm Plug)