[Elecraft] CW slopes, sensitivity, calibration

[Ignacy Misztal]

My K2 #704 has good passbands on SSB and CW. However, filters seem to be 
wide. On SSB, I can hear loud stations 4 KHz off. On CW in the narrow 
mode, 59+20 signals are heard (faintly) +-1.5 KHz. Could this indicate 
that crystals need to be replaced? Graphs on the Web showed bandwith on 
CW using  .1 setting 1.2 KHz or +-.6 KHz without a modification and .8 
or +- .4 KHz after.

The sensitivity of K2 in general is good but can be better. For example, 
on 20m in the morning when signals are weak and band noise low, I find 
that TS-850 hears better. This is with 2 el quad. Still, the increase in 
noise after adding RF amp is similar in both radios.  Could this mean 
that bandpass filters in K2 have weak coupling (and higher passband 
losses) to maximize out-of-band rejection? Or is rf amp in K2 more noisy?

On lower bands, my K2 is accurate within 100 Hz. On 10m, it may be off 
by 800 Hz. Does it mean that the unit needs calibration? Since the major 
tuning in K2 is done by a synthesizer, it seems that the difference on 
10m should not be that large.

73,
Ignacy, NO9E