. While many premium cables use expensive FTDI chips, the LD-C101 often utilizes the CH340, a workhorse serial-to-USB converter known for:
This typically happens if the cable uses an older Prolific chip clone and a newer Windows Update has blocked it. To fix this, you must roll back to a legacy version of the driver (such as version 3.2.0.0 or older) via Device Manager by using the "Let me pick from a list of available drivers on my computer" option. Fluctuating COM Port Numbers
: Typically appears in Windows Device Manager as "USB-SERIAL CH340" under Ports (COM & LPT) once the driver is installed. Driver & Compatibility Ld-c101 Usb To Ci-v Driver
At its core, the LD-C101 is a sacrifice. It is a FTDI (or often, a cheaper, cloned) serial bridge chip, soldered to a level shifter that drops the computer’s clean 5V or 3.3V logic down to the CI-V bus’s simple open-collector standard. It is a device designed to be ignored. When it works, the radio and the computer achieve a perfect, silent symbiosis. The waterfall scrolls. The frequency readout on the PC screen matches the VFO exactly. A ghost seems to turn the dial.
: Essential for operating FT8, RTTY, or PSK31 where the computer must trigger the radio to transmit. Fluctuating COM Port Numbers : Typically appears in
Before downloading any software, you must understand that "LD-C101" is the product model name, not the name of the actual electronic chip handling the data conversion. Manufacturers typically build these cables using one of two major USB-to-Serial chipsets:
You begin to doubt. You check the cable. You check the solder joints on the LD-C101’s miniature PCB. You find a forum post from 2014 in Russian, Google-translated to cryptic poetry: “Set RTS high or low. No, other way. Ground pin 7. No, pin 5. Use 3.5mm plug, not 2.5mm. Pray to Kenwood.” It is a device designed to be ignored
: A highly common, cost-effective alternative. How to Check Your Chipset
: Provides a communication bridge between a computer's USB port and the CI-V (Computer Interface 5) remote jack on Icom transceivers like the IC-706, IC-718, and IC-756. : Identified as the serial-to-USB bridge. Hardware ID
The LD-C101 will eventually die. A cold solder joint will crack. The counterfeit FTDI chip will be bricked by a driver update. Or you will simply forget it in a box, replaced by a radio with built-in USB audio and CAT control. Progress is a glacier, not a spring.
: Some cheaper versions of these cables use "clone" chips. Official drivers (especially Prolific) may intentionally disable these, leading to a "Code 10" error in Device Manager.