Does the SignaLink use a Serial Port to key the radio?
Unlike other interfaces, the SignaLink never requires a serial port connection. This is particularly handy if your computer doesn’t happen to have one available! In additions to simplifying your installation, this feature also reduces the likelihood of the computers RF noise from getting into your radio. The SignaLink uses a built-in digital Auto-PTT circuit that virtually eliminates the need for a serial port connections.
