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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