This specific rear port serves two purposes: it outputs analog audio for an external extension speaker during normal operation, and it handles TTL-level data exchanges when connected to a PC.
The requires a specific three-wire layout utilizing a 3.5mm audio jack connected to a USB-to-TTL serial adapter . Unlike many amateur mobile transceivers that program via their front-facing RJ45 microphone port, the QYT KT-8900 utilizes a dedicated "DATA" jack located on the rear panel .
Open CHIRP, go to -> Download From Radio , select your assigned COM port, choose Vendor QYT , and Model KT8900 . Common Troubleshooting Issues
What (CHIRP, QYT factory software, etc.) are you running? What error message or behavior are you experiencing? qyt kt8900 programming cable pinout top
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:
Open your preferred programming software (such as CHIRP or the official QYT OEM software). Select the correct model ( QYT KT8900 ), choose the identified COM port, and turn the radio volume knob to roughly 50-70% capacity before executing a "Read from Radio" command to test your new custom cable.
If the software times out without receiving a response, your data transmission lines might be backwards. Try swapping the wires running to the Tip and the Ring on your DIY adapter board. This specific rear port serves two purposes: it
Yes, if you wire a Bluetooth module (HC-05) to pins 1,2,3,6 using the TTL-level signals. The “top” pinout remains the same.
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
If you are DIY-ing a cable using a standard USB-to-TTL serial adapter (like an FTDI or CH340 board), the connections to the 3.5mm plug are as follows: RX (Data Receive) TX (Data Transmit) GND (Ground) Digirig Forum Note on Connector Fit: Open CHIRP, go to -> Download From Radio
: Ensure the 3.5mm plug is pushed all the way in. The recessed nature of the jack sometimes prevents standard bulky plugs from seating correctly.
: TXD (Transmit Data) — Sends data out from the radio to the PC.
