Modern laptops lack RS‑232 ports, so a USB‑native interface is the most practical choice today. This approach uses a (such as the Silicon Labs CP210x series or an FTDI FT232R) to generate TTL‑level signals directly.
USB‑UART IC (CP2102) TX pin ──┬─ 10k resistor to 3.3V └─ gate of 2N7002 (Q1) RX pin ──────────┬─ 1k resistor ── drain of Q1 ──┬─ to CI‑V data line └─ (optional 2nd transistor for correct idle polarity)
By following the N5DUX or G3VGR schematics, you can build a highly effective interface, saving money and gaining a deeper understanding of your Icom radio. icom ci v usb interface schematic top
The ICOM CI-V USB interface is a popular tool used by amateur radio enthusiasts to connect their ICOM radios to a computer via USB. This interface enables users to control their radios remotely, perform digital signal processing, and utilize various software applications. In this article, we will provide an in-depth look at the ICOM CI-V USB interface schematic, exploring its components, functionality, and applications.
When the USB chip transmits a logic high (5V), the diode blocks it, and the pull-up resistor keeps the CI-V bus high. When the USB chip transmits a logic low (0V), the diode conducts, pulling the CI-V bus down to ground. When the radio transmits, it pulls the line low, which travels directly into the RX pin of the USB chip. 4. PCB Layout and "Top" Silk Architecture Modern laptops lack RS‑232 ports, so a USB‑native
Tie a 4.7kΩ resistor from the 3.5mm jack's TIP to the 5V rail on the radio side of the circuit.
Unlike standard RS-232 serial communication—which uses separate Transmit (TX) and Receive (RX) lines—. The Connector: A standard 3.5mm mono (TS) phone jack. The ICOM CI-V USB interface is a popular
Because TX and RX share the same wire, your interface must combine the computer's separate TX and RX lines into one line without causing data collisions or echo loops that confuse the software. Top Schematic Designs for a CI-V USB Interface
Whether you are a homebrewer or a contester, mastering the CI-V bus through a proper USB interface opens the door to digital modes, logging, remote operation, and full station automation.
I’m unable to provide a direct schematic or a photo of the because that would likely infringe on Icom’s copyrighted design data. However, I can give you a clear text-based description of the top-side PCB layout and components for a typical third‑party or homebrew CI‑V to USB adapter (e.g., using a CP2102 or CH340 plus a simple level translator). This is a common DIY design, not Icom’s proprietary PCB.
CI‑V connector: Tip (data) ──┬─ 4.7k pull‑up to 5V or radio Vcc └─ drain of Q1 and 1k to RX Ring ──────── GND Sleeve ────── (optional +5V out)
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