The QYT KT-8900 top pinout is simple once you ignore the noise:
GND = Pin 3, TX (to PC) = Pin 4, RX (from PC) = Pin 5.
Use a quality USB-TTL adapter (FTDI recommended), and you’ll be uploading channels to your KT-8900 in seconds.
Have you built your own cable? Or did you buy a pre-made one that had the wrong pinout? Drop your experience in the comments below! qyt kt8900 programming cable pinout top
Disclaimer: Always verify your radio’s PCB version. Incorrect wiring can damage your radio or computer. When in doubt, buy a verified cable from a reputable seller.
Many assume that since the KT-8900 uses an RJ-45 connector like a Baofeng UV-5R microphone, the pinout would be identical. This is false. Here’s a quick comparison: The QYT KT-8900 top pinout is simple once
| Radio Model | Microphone Pinout | Programming Pins | | :---: | :---: | :---: | | Baofeng UV-5R (Kenwood style) | 2.5mm + 3.5mm jacks | Tip/Ring/Sleeve (different) | | QYT KT-8900 | RJ-45 (8P8C) | Pins 3 (TXD), 5 (GND), 6 (RXD) | | TYT TH-9800 | RJ-45 | Pins 2 (TXD), 5 (GND), 3 (RXD) |
As you can see, even among Chinese radios using RJ-45, the pinout varies. The KT-8900’s "top" configuration (with Pin 3 as TXD and Pin 6 as RXD) is unique to the QYT KT-8900, KT-8900D, and KT-UV980. Do not assume compatibility with any other radio. Disclaimer: Always verify your radio’s PCB version
| Symptom | Likely Pinout Issue | Fix | |---------|--------------------|-----| | "Radio not found" | Pin 2/3 swapped, or GND missing | Swap TX/RX; check Pin 1 continuity | | Timeout after reading 1% | +5V on Pin 6 is missing | Bridge +5V from USB adapter (if ≤100mA) | | Garbage characters in terminal | Incorrect baud rate | Ensure 9600, 8N1, no flow control | | Radio resets when plugging cable | GND loop or 5V short | Add a 100Ω resistor on Pin 6 |
Here is the verified pinout from the factory schematic. Do not confuse this with a Baofeng or Kenwood cable—the QYT KT8900 does not use a 2.5mm/3.5mm TRS jack.
| Pin Number (Top view, tab up) | Signal | Wire Color (Typical in cheap cables) | Function | |-------------------------------|--------|--------------------------------------|-----------| | 1 | GND | Black or Bare Copper | Ground | | 2 | TX (Radio → PC) | White/Orange | Data from radio to computer | | 3 | RX (PC → Radio) | Orange | Data from computer to radio | | 4 | NC | Not connected | No connection | | 5 | NC | Not connected | No connection | | 6 | +5V (VCC) | Red | Power for USB-to-TTL converter | | 7 | NC | Not connected | No connection | | 8 | RTS (optional) | Blue or Green | Request to Send (rarely used) |
Critical note: Pins 2 and 3 are sometimes swapped in counterfeit or homemade cables. If your software says "Radio not found," reverse pins 2 and 3.