Here's something that may be of interest to solder-minded K2 owners pondering filtering options. I've built and installed a KAF2 kit with several component changes to make it a little wider in bandwidth, so as to be more useful in general CW operating, scanning the bands and contests rather than being focused on pulling the weakest signals out of noise and QRM. It also retains the full bandwidth of the OP1 filter when off (but still switched in) and so does not impair wideband digital mode operation, as I believe the stock KAF2 will, to a degree. Component changes and some test data are shown at
http://www.qsl.net/ve3sma/ModifiedKAF2.pdf .
73,Steve VE3SMA
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