When my K2/100 is keyed in SSB mode (connected to a dummy load) and the
microphone is gently tapped, I can hear a faint noise coming from somewhere
on the KPA100 printed circuit board. It is a low level buzzing/rattling
noise similar to a small metal object vibrating against a loudspeaker cone
Ray,
How old is this KPA100? If it is the older design with red toroid cores
at L15 and L16, I suggest that you update it with the KPA100UPKT. In
addition, the shield may have to be upgraded as well. If the slot above
the SO-239 jack is much greater than 3 mm, and you do not have the
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