Unlike many mobile radios that use an RJ-45 microphone jack or a dedicated data port for programming, the QYT KT-8900 routes its programming data through the located on the rear panel.
A standard 3-pin (TRS) audio plug or a 4-pin (TRRS) plug salvaged from an old set of headphones.
If you own a QYT KT-8900 (or its variants like the KT-8900D or KT-980Plus), you already know the value of this compact dual-band radio. It packs a punch for its size, but programming it via the front panel keypad is an exercise in patience. qyt kt8900 programming cable pinout top
) primarily uses a 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)
: Install the appropriate drivers for your specific USB-TTL chipset before plugging in the cable. Unlike many mobile radios that use an RJ-45
The 3.5mm jack is deeply recessed into the radio's aluminum chassis. Standard DIY audio plugs with bulky plastic housings will not sit deep enough to make contact. Ensure you choose a slimline or molded 3.5mm connector when building your own cable. 📌 QYT KT-8900 3.5mm TRS Programming Pinout
The KT-8900 communicates using standard asynchronous serial data at . It does not use standard RS-232 voltage levels (+/- 12V), which will damage the radio. The interface relies on a standard three-wire serial connection: It packs a punch for its size, but
While programming usually happens via the 3.5mm jack, the front RJ45 microphone port
If you are building your own cable using a USB-to-TTL (UART) module, such as the CP2102 , wire it as follows: 3.5mm Plug Part UART Module Pin TXD (Transmit) Ring RXD (Receive) Sleeve GND (Ground)
Have you had success (or nightmares) programming your QYT? Let us know in the comments below!