To build on what others have said, There is a confirmed spike at the end of a transmission that has been confirmed on the bench.? The best way to protect against this failure is to install a commutating diode across L14, with the banded (cathode) side connected to the +12 volt side of L14.? A 1n4148 is a good choice for the diode.
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When running digital modes, this spike occurs once in an FT cycle.? In CW, it would be every dit or dah, significantly increasing the chance of failure.
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73
Evan
AC9TU
