The LD-C101 is not just a simple cable; its internal circuit board has been documented by hobbyists. The PCB contains unpopulated pads for an optocoupler connected to the DTR signal line. This allows advanced users to modify the cable by soldering in an optocoupler IC. This modification enables hardware-based Push-To-Talk (PTT) control directly from the computer's RTS or DTR line, which is a useful feature for digital modes on older ICOM radios that lack a CI-V PTT command. Additionally, the cable's design even includes the designer's amateur radio callsign (BD7JAO) on the board.
Note: Make note of the COM port number (e.g., COM3) as you will need this in your radio software. Troubleshooting Common LD-C101 Driver Issues
If the driver works perfectly while receiving but disconnects the moment you press the PTT button to transmit, you are dealing with RF interference. The USB cable acts like an antenna, picking up stray RF signal and confusing the driver chip. Loop the LD-C101 cable through a snap-on ferrite bead close to the computer end and another close to the radio end to suppress common-mode RF energy. Conclusion Ld-c101 Usb To Ci-v Driver
The LD-C101 is a specific USB interface cable designed for this purpose, and its driver software allows the computer to recognize and interact with the device.
The LD-C101 USB to CI-V driver has a range of applications, including: The LD-C101 is not just a simple cable;
If you experience persistent issues, spend an extra $10 on a known-good CP2102-based LD-C101 from a reputable ham radio dealer. The time saved in driver debugging is worth the investment.
You must roll back or manually install an older, compatible version of the Prolific driver (typically version 3.2.0.0 or older). Turn off automatic driver updates for that specific device to prevent Windows from overwriting it later. Issue 2: The COM Port Changes Every Time You Plug it In Troubleshooting Common LD-C101 Driver Issues If the driver
I can provide customized troubleshooting steps for your exact setup. Share public link
The LD-C101 is not just a simple cable; its internal circuit board has been documented by hobbyists. The PCB contains unpopulated pads for an optocoupler connected to the DTR signal line. This allows advanced users to modify the cable by soldering in an optocoupler IC. This modification enables hardware-based Push-To-Talk (PTT) control directly from the computer's RTS or DTR line, which is a useful feature for digital modes on older ICOM radios that lack a CI-V PTT command. Additionally, the cable's design even includes the designer's amateur radio callsign (BD7JAO) on the board.
Note: Make note of the COM port number (e.g., COM3) as you will need this in your radio software. Troubleshooting Common LD-C101 Driver Issues
If the driver works perfectly while receiving but disconnects the moment you press the PTT button to transmit, you are dealing with RF interference. The USB cable acts like an antenna, picking up stray RF signal and confusing the driver chip. Loop the LD-C101 cable through a snap-on ferrite bead close to the computer end and another close to the radio end to suppress common-mode RF energy. Conclusion
The LD-C101 is a specific USB interface cable designed for this purpose, and its driver software allows the computer to recognize and interact with the device.
The LD-C101 USB to CI-V driver has a range of applications, including:
If you experience persistent issues, spend an extra $10 on a known-good CP2102-based LD-C101 from a reputable ham radio dealer. The time saved in driver debugging is worth the investment.
You must roll back or manually install an older, compatible version of the Prolific driver (typically version 3.2.0.0 or older). Turn off automatic driver updates for that specific device to prevent Windows from overwriting it later. Issue 2: The COM Port Changes Every Time You Plug it In
I can provide customized troubleshooting steps for your exact setup. Share public link