[Elecraft] Filtering

[Mark Rozmilowski]

Does anybody know why when you tune K2  away (6 kHz for example)  from strong signal 59 +20db and
there are many of those on SSB  you can still  hear high freq. "noise" from that station.
Is it because filter doesn't attenuate enough or signal is going around the filter.
I would like to eliminate this problem but not by adding audio filtering. This should be eliminated
at its origin.
I think that there is similar problem on CW but I have to do more experiments.

Thanks and 73! Mark WQ7X
K2 SN#2507