> Let me guess that you were using a parallel port to key the rig.
> For stubborn cases of rfi to keying lines, I find the easiest
> solution is to use a serial port instead. You can use one
> serial port for both rig control and keying. For some reason
> the serial ports are more immune to rf.
This is a true statement. Since the serial port puts a
negative voltage across the base emitter junction, the noise
immunity is much higher than the parallel port.
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