If you own a QYT KT-8900 mini mobile radio, you know it’s a powerhouse for its size. But programming it manually via the front panel? That’s a fast track to frustration.
The QYT KT-8900 is a popular amateur radio transceiver, and programming it requires a specific cable. The programming cable pinout is crucial to ensure successful communication between the radio and the programming software.
Connect the GND pin of the module to the Sleeve of a 3.5mm stereo plug.
Disclaimer: Always exercise caution when modifying cables or interfacing with radio ports. Incorrect wiring can damage your transceiver.
Inside the programming cable, the two plugs are wired to a USB-to-TTL serial adapter (often a Prolific PL2303 or CH340 chip):
| Pin Number | Signal Name | Wire Color (Typical in OEM Cable) | Function | | :---: | :---: | :---: | :---: | | Pin 1 | NC / GND | Black | Not connected in programming mode (ground on some versions) | | Pin 2 | SPK- (Speaker -) | Yellow | Negative speaker line (not used for programming) | | Pin 3 | MIC / TXD | Blue | Programming Transmit Data (Radio → PC) | | Pin 4 | PTT | Green | Not used during programming | | Pin 5 | GND | Brown | System Ground (critical for programming) | | Pin 6 | RXD | Red | Programming Receive Data (PC → Radio) | | Pin 7 | VCC / 5V | Orange | +5V power from radio (only active when radio is ON) | | Pin 8 | SPK+ (Speaker +) | White | Positive speaker line (not used for programming) |