The QYT KT-8900 programming cable uses a single 3.5mm TRS (Tip-Ring-Sleeve) stereo-style plug to interface with the radio's data port. While often sold with a Prolific-based USB converter, reviews frequently highlight compatibility issues with modern operating systems. Pinout Specifications
The programming interface is a simple 3-pin setup (GND, RX, TX) typically wired to a 3.5mm connector: Tip: TX Data (Transmit from PC to Radio) Ring: RX Data (Receive from Radio to PC) Sleeve: Ground (GND) Critical Review Insights
Some advanced users replace the CH340 chip with an FTDI FT232RL. The pinout remains identical at the RJ-45 side, but the TTL side changes:
The QYT KT8900 is a popular mini mobile ham radio, but like many Chinese radios, it uses a non-standard Kenwood-style connector for programming—not the standard 2-pin or 8-pin mic connector you might expect.
The QYT KT8900 uses TTL-level serial (0–5V), not RS-232. This means:
If you are building your own cable, you will connect:
The QYT KT-8900 is a fantastic little rig, but the programming cable situation can be tricky. Understanding the pinout and the driver requirements is half the battle. If you are buying a cable, look specifically for "KT-8900 support" and opt for an FTDI chipset if possible—it will save you hours of driver headache. qyt kt8900 programming cable pinout top
Have you had success (or nightmares) programming your QYT? Let us know in the comments below!
Disclaimer: Always exercise caution when modifying cables or interfacing with radio ports. Incorrect wiring can damage your transceiver.
How to Build Your Own QYT KT8900 Go to product viewer dialog for this item. Programming Cable: Pinout & Guide QYT KT8900 Go to product viewer dialog for this item.
is a popular, budget-friendly mobile dual-band radio, but getting it programmed via software can sometimes be a headache if you don’t have the right cable. While you can buy them online, building your own—or repurposing an old Baofeng cable—is a great weekend project for any ham radio enthusiast. The Programming Interface
Unlike many other radios that use the microphone port, the QYT KT8900 family (including the Go to product viewer dialog for this item. Go to product viewer dialog for this item.
) primarily uses a 3.5mm jack for data transfer. According to documentation from HamGuyParts, while the radio may feature a 4-contact (TRRS) jack, it typically only uses three pins for programming: Ground (GND), Receive (RX), and Transmit (TX). QYT KT8900 Programming Pinout (3.5mm Plug) The QYT KT-8900 programming cable uses a single 3
To build the cable, you will need a standard 3.5mm stereo plug (TRS). The pinout is as follows: Tip: RX Data Ring: TX Data Sleeve: Ground (GND)
Note: Some users have reported that the "Data" port on the front and the "Speaker" port on the rear can behave differently depending on the specific revision of your radio. If the front port doesn't work, some enthusiasts on the Digirig Forum suggest trying the rear 3.5mm port labeled "Speaker". DIY Build: Converting a Baofeng Cable
If you have an old Baofeng handheld programming cable lying around, you can easily convert it for the
Cut the Connector: Snip off the twin-prong Baofeng connector.
Identify Wires: Strip the wires to find GND, RX, and TX. You may need a multimeter to verify which wire corresponds to which pin on the USB-to-Serial chip (usually a PL2303, CH340, or FTDI).
Solder to 3.5mm Plug: Follow the TRS pinout mentioned above. Alternative: The FTDI Cable Pinout (Top View) Some
Seal it Up: Use heat-shrink tubing to protect the joints and make the cable sturdier. Software Tips CHIRP Support: Most QYT KT8900
models are supported by CHIRP, making it easy to import repeater lists.
Driver Issues: If your computer doesn't recognize the cable, it's often a driver issue with "counterfeit" Prolific chips. Using a cable with an FTDI chip or a CH340 chip is highly recommended for compatibility with Windows 11.
COM Port Setup: If you get a "Communication Port Open Error," ensure you have selected the correct COM port (usually COM3 or higher) in your software settings.
Building your own cable not only saves a few bucks but also gives you a deeper understanding of how your gear works. Happy programming!