I'm curious about the 6 kHz filters. Why two?

dxAce
Michigan
USA

Hi dxAce

The ceramic 6KHz Kiwa filter is at the 455 KHz stage whereas the FL-33
is at the 9 MHz stage and is a crystal filter. The plan was to get
better ultimate rejection and I'm happy with the results. The FL-33
goes in the vacant CW narrow filter slot and mod requires cutting two
resistors and soldering 2 wires. One additional bonus is that in the
narrow bandwidth setting you get proper passband tuning and can rock
from LSB to USB without retuning.

Cheers

Andy