[Elecraft] K2 low sensitivity on 15 and 10m?

[Dave]

In an idle moment, I decided to check the signal to noise ratio of both my
K1 and K2 on all their bands... for some odd reason, my K2 is below par on
15m and 10m. The pre-amp offers no real improvement. These figures have
probably always been the case, the list is as follows:

160m to 20m <0.14uV
17m 0.25uV
15m 0.45uV
12m 0.15uV
10m 0.32uV

Levels in pd, 400 Hz bandwidth on CW, no audio filtering. Pre-amp off. For
comparison, the K1 has a sensitivity of 0.11uV on 15m. The higher frequency
band pass filters have been reduced in bandwidth as per the "A to B mods".

Does anyone else with a decent signal generator have comparison figures? I
suspect my K2 isn't as good as the rest and the pre-amp increases the
background noise but makes hardly any improvement in signal to noise ratio.

73 Dave, G4AON
K2 #1892
www.astromag.co.uk/k2/