These chokes help prevent RF radiation, which may be present in any shack, from feeding back into the computer, which can sometimes cause some very strange behavior in the HRD software.

Notice the 'Ferrite Chokes' on each end of the cable. SignaLink, Rig Blaster, Rig Expert, or other interface) is required because this USB cable provides the connection for the Rig Control and it also carries the Audio for the radio's built-in soundcard which is accessed by a 'USB Audio CODEC' once the proper driver from the radio's manufacturer is installed.īelow is an image of the USB cable we recommend. The most common way of interfacing your radio to the computer is via a standard A/B type USB cable. Important: Please read and understand the instructions in this document prior to connecting your radio to the computer. Solution home Knowledgebase Radio Support FT-991 USB Configuration