Thanks to all who responded to this thread. I have K3 1433 with 2.8K and 400 Hz. filters. I boosted the 400 gain from 2 to 6 and the difference was amazing.
With the NR the CW is now EASILY cleaned up at VERY narrow bandwidths! I thought it was good before but now I see why contesters and DXers would love this rig. Jack, AE6GC _____ K3NA wrote: "I've looked at three 400 Hz filters to date and values do vary from filter to filter; one of mine required 6 dB gain. Other 8-pole filter bandwidths also vary a bit as well. Just measure all the filters in the radio and true up the gains. Don't need to worry about what the actually gain numbers are, as long as they can be goosed up to a uniform level." I have the 500 Hz 5-pole, 400 Hz 8-pole, and 200 Hz 5-pole filters and "trued up" the gains by ear and came up with 2dB, 6dB, and 8 DB respectively. This ability to adjust the gain in one dB increments to compensate for filter insertion loss is a wonderful feature of the K3. BTW, the 400 Hz 8-pole is my favorite CW filter. 73, Chuck Guenther NI0C K2/10 s/n 5853 K3/100 s/n 1061
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