[Elecraft] K2 / KX3 receiver observation - need explanation

[gt-i at gmx.net]

Don,
thanks for the hints. The K2 is almost original with some simple mods 
that had been published during the "early days".
I pulled out my XG3 and tried to reproduce the problem. But I could not 
hear a clean 2nd or 3rd signal, but a lot of hard noise nearby.
I guess the XG3 is just not clean enough - on my scope it produces 
squares not a sine -  to let me do this comparison.

I guess I need to do some more observations to nail it down.
Tnx, 73 Gernot, DF5RF