[Elecraft] K2-CW-Filter-Response: is that ok?

[Karsten Eppert(DK4AS)]

I have set the wide CW-Filter (Fil1) to 1,5 and aligned the BFO to a 
pitch of 700 Hz. I applied HF of constant frequency to the 
receiver-input with a signal strength that generated S9+10 db max. and 
plotted the S-meter versus variation of the VFO from high pitch to low 
pitch in 100 hz-steps. So I could determine a filter-curve. What strikes 
me is, that even at very low pitch-frequencies there is hardly 
attenuation and even at zero beat the S-meter still shows approx. S3. 
Turning the VFO "behind" zero-beat lets the S-meter decrease but it 
takes another 300 Hz until S0 is reached. The tone of the "wrong" 
sideband remains audible at even higher frequencies.

In real amateur life this means, that strong near-by stations close to 
zero-beat still affect the AGC considerably.

 

My question is: is that typical for the cw-filter-design of the k2 or is 
something wrong with my device? Do I have any method to check, if 
something is dead or badly installed?

By the way: I did the same kind of plot with the Filter of the 
SSB-Adapter (OP1). Result: perfect.

 

Karsten

DK4AS