pins are often relevant for building repeater controllers or custom mics. Looking at the front of the radio, pin 1 is on the left: Chassis Ground PTT (Push-to-Talk) Mic Ground / Shield Microphone Audio RX Audio (Fixed level) Tips for DIY Cables Adapter Type
The QYT KT8900 is a dual-mode, dual-band amateur radio transceiver that operates on both VHF and UHF frequencies. It features a compact design, a user-friendly interface, and a range of advanced features, including digital signal processing, noise reduction, and wireless connectivity. The radio is popular among amateur radio operators due to its reliability, performance, and affordability.
Once your hardware is ready, you must set up the software.
Connecting a standard RS-232 serial cable directly to the radio will permanently damage the internal logic board. Therefore, your programming cable must incorporate a , such as the FTDI FT232RL, CH340, or Prolific PL2303. 2. The QYT KT8900 3.5mm TRRS Pinout Configuration qyt kt8900 programming cable pinout top
| Pin Number | Signal Name | Description | | --- | --- | --- | | 1 | TXD | Transmit Data | | 2 | RXD | Receive Data | | 3 | GND | Ground | | 4 | NC | No Connection | | 5 | NC | No Connection | | 6 | NC | No Connection | | 7 | RTS | Request to Send | | 8 | CTS | Clear to Send | | 9 | GND | Ground |
After researching and testing, we have identified the following pinout for the KT8900 programming cable:
For standard programming, only these three connections are used, meaning an ordinary 3.5mm stereo (TRS) plug is often sufficient even if the jack is TRRS. Key Considerations for Setup Rear Data Port: Programming is done through the dedicated "DATA" jack pins are often relevant for building repeater controllers
The QYT KT-8900 is a highly popular, compact dual-band mini mobile radio favored by amateur radio operators. While the radio is budget-friendly and highly functional, programming it manually via the microphone can be tedious. Using a programming cable with software like CHIRP makes the process seamless. However, factory cables frequently fail due to counterfeit chips, or operators simply prefer to build their own custom data cables.
Open CHIRP, go to -> Download From Radio , select your assigned COM port, choose Vendor QYT , and Model KT8900 . Common Troubleshooting Issues
Connect the pin of the module to the Tip (RX) of the plug. The radio is popular among amateur radio operators
USB-TTL Adapter Side 3.5mm Stereo Plug (Radio) -------------------- ------------------------- TXD (Transmit) ----------------> Tip (Radio RX) RXD (Receive) ----------------> Ring (Radio TX) GND (Ground) ----------------> Sleeve (Radio GND) 3. Step-by-Step Construction
: A sacrificial male-to-male audio cable with a narrow collar. Soldering Iron and Heat Shrink Tubing . Wiring Schematic (USB Adapter to 3.5mm Jack)