[Elecraft] KX3 Roofing filter questions

[Michael Aiello]

Hi,
After installing the roofing filters in my KX3 (which was a while ago), it
seemed to me that the received audio was down somewhat from the levels I
recall from before the filters were installed.
At the suggestion of another KX3 owner, I tried the following experiment: I
hooked up my XG1 signal generator directly to the KX3. With the AGC turned
off, in CW mode and the narrowest bandwith so that filter 3 was selected,
and the XG1 at 50uv, I let the AFV indication stabilize, then noted the AF
db was at 0.0db, Opening the PBT control until filter 2 clicked in, and the
dbv jumped to +1.1db. I kept going until filter 1 clicked in, and the dbv
jumped to +1.4db.
I tried this sequence in both directions, both at 50uv and 1uv, and that
ratio of 1.4 - 1.1 - 0.0 was repeatable at both signal levels.
Is this normal for using the roofing filters?
Thanks
Mike N2HTT