Some say it is the same sound card that is in the Yaesu SCU-17, Yaesu’s equivalent of the Signalink device. The FT-991 comes with a built in sound card. No USB to Serial converter needed, so additional interface boxes – just a USB cable ( *Note, see farther down in the post as to which cable you want to purchase. CAT control as well as PTT via one USB cable from the computer to the radio. This post is about setting up digital communications with the FT-991/991a, with only a USB cable. I have tried the Buxcom, the West Mountain Radio ( The M8, yeah.
Buxcom, West Mountain Radio, Signalink, and even MFJ is getting into the market with their own audio device. There are several different types of interface devices that you can purchase to make this connection. The software on the computer generates audio that goes from the computer sound card to the radio as well as from the radio to the sound card. Hams who are running PSK31 or JT65 or FT8/4 or some other digital mode are using a computer connected to an audio interface that is then connected to the radio. Some of you might might be new to digital communications on the ham bands, so let me start from the beginning. If you are running V2.2.0 with the 991 upgrade to V2.2.1. Version 2.2.1 appears to have FIXED the issue. when you try to connect the 991 you will see a “hamlib error” when you try to do the CAT connection. UPDATED – There is a BUG in WSJT-X V.2.2.0.
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