I've been playing around on 160 meter RTTY the last few days and had a
problem with the keyboard freezing when the power exceeded a certain level,
around 1kw output. I tried three different keyboards and enough ferrites on
the keyboard cable to anchor a battleship but no luck. In fact, no
improvement at all. And that got me to thinking: Why didn't the ferrites help?
Perhaps the problem isn't in the keyboard at all, but rather the connection
inside the computer, since all three keyboards had exactly the same
sensitivity to the power level, and adding ferrites made no change in the
sensitivity.
Long story short: I happened to have a USB keyboard laying around, so I
tried it. Presto! Problem solved, perfect operation at any power level. I
can't say this would work in every instance, but it's worth a try. The
keyboard is just an inexpensive one made by AOpen.
One problem with this is the BIOS does not recognize a USB keyboard, so it
must be set to not stop on keyboard errors, and if you want to hit DEL to
set the BIOS, you have to temporarily plug in a regular keyboard.
Something to keep in mind if you have keyboard RFI problems.
Bill, W6WRT
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