[Elecraft] K3 2.7kHz filter DSP FC

[Barry N1EU]

"If the center frequency was set to 1.225 KHz (or close) as you suggest, then
the 2.7 KHz filter would let though too much opposite-sideband energy. We
want some stopping power down close to zero Hertz, so the filter edge is
kept 250 Hz above zero."

I don't understand a need to lock the lower filter edge above 250hz
for opposite sideband rejection.  The dsp filtering slope is very
steep.  You can set the Orion lower filter edge to 50hz and it sounds
great.

73,
Barry N1EU