Part of our The Yaesu FT-857D: The Complete Guide.
The Physical Connection
CAT control on the FT-857D runs through the Mini-DIN CAT jack on the rear panel, not the DATA jack used for digital mode audio. You’ll need a CAT cable with a USB-to-serial adapter on the computer end, since the radio predates native USB. Cheap USB-to-serial adapters with generic chipsets are the number one cause of flaky CAT connections on older Yaesu radios, so if you’re having trouble, a known-good FTDI-chipset adapter is worth the extra few dollars before you assume the radio or software is at fault.
Set the Radio’s CAT Menu Items
Two menu items matter here: the CAT/LIN/TUN setting needs to be on CAT, and the CAT rate needs to be set to a baud rate you’ll remember and match on the computer side. Write both down. If either one drifts from what Ham Radio Deluxe expects, you’ll get a radio that powers on fine but never talks to the software.
Configure Ham Radio Deluxe
In HRD’s Rig Control setup, select the FT-857D from the radio list (or the FT-857 if the D variant isn’t separately listed, they share a CAT command set), choose the COM port assigned to your USB-to-serial adapter, and set the baud rate to match what you configured on the radio. Confirm the port number in Windows Device Manager first if you’re not sure which one it landed on, especially if you’ve got other USB serial devices connected.
When It Connects but Feels Laggy
A CAT link that connects but responds slowly to frequency changes or PTT is usually a baud rate that’s technically matched but set too low for how HRD is polling the radio. Bumping both the radio and HRD to a higher matched rate usually clears it up. If you’re running other software that also wants CAT access to the same radio at the same time, like a digital mode program, make sure only one has direct serial access, or route everything through HRD’s own rig-sharing so they’re not fighting over the port.
Once CAT is solid, the same connection is what powers logging, band-following software, and rig-linked digital mode tools. It’s worth getting right once rather than re-troubleshooting it every session.