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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