[Elecraft] k2- 28Mhz sensitivity

[Tsachy Lindenbaum]

Hello
I can't decide whether this is a feature or a  "local bug",
but when using my k2 with 50Mhz Xvrtr (D.E.M 28-50) I get leakage on 10m
from strong stations (even from in Europe - sometimes  with no antenna
connected!!!).
(Very good for 28Mhz operation - but troublesome on 50.120 (psk mostly) ).
Fortunately enough, not much and not on critical frequencies, but it does
happen.
Any idea on prevention ? This is tricky because it's that segment used as an
I.F for 50Mhz.
73 de Isaac, 4Z4TL.