[Elecraft] Receiver overload on 40m

[Bob Jones]

I've recently completed K2 5336 but only today connected a properly  
resonant antenna on 40m.
The results surprised me. With the pre-amp on the receiver suffers  
from serious overload and intermodulation and 40m  - a problem that  
does not occur with the same set up on my FT1000MP. I've played  
around with AGC and RF gain settings but it is pretty much unusable  
with the pre-amp switched on. Both the FT1000MP  (with no  
attenuation) and the K2 (with the pre-amp switched on) register S9  
for 50 microvolts signal input, so I'm assuming (perhaps wrongly?)  
that they have comparable sensitivity under these conditions. I know  
I'm getting sufficient sensitivity for the band conditions with the  
pre-amp off, but the apparent poorer performance of the K2 puzzles  
me, particularly as other independent tests have indicated that it  
should be better than the FT1000 with respect to strong signal handling.

Any suggestions?

73 Bob G3YIQ