[Elecraft] K3 - Sensitivity on 10 Meters

[Dave Hachadorian]

During the CQWW RTTY Contest this past weekend, I got the feeling 
that the K3 receiver could have used some additional RF gain.  I 
was using the 250 Hz filter with +4 dB of I.F. gain dialed in. 
Switching the preamp on and off produced just a barely 
perceptible change in the background noise.  I seem to remember a 
previous discussion about the need for a ten-meter preamp, but 
haven't heard any more about it.  Has anyone done a test to see 
if the minimum detectable signal is up to snuff on 10?

Fifteen meters was better, but still less than what I expected 
when switching the preamp in and out.

Dave Hachadorian, K6LL
Yuma, Arizona