[Elecraft] [K2] Low sensitivity with variable-bandwidth filter

[Bill Coleman]

OK, I have a K2/100 w/ KAT100 that may have recently suffered from a static discharge event. I had to replace D16 & D17 in the KPA100, and I’m likely to do the same to the SWR bridge diodes in the KAT100 (since I can’t get the bridge to null properly).

The other thing I noticed is that the receiver sensitivity is substantially lower when using the CW filter. Using OP1, it seems to receive normally. I have three filters for CW 1.0, 0.4 and 0.16. When switching to 1.0 from OP1, signal levels drop by about 2-3 bars on the S-meter.

Anything in particular I should troubleshoot?

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
            -- Wilbur Wright, 1901