[Elecraft] K2 CW Tone

[a.yoshida]

K2 #4504
A few days ago I received RST 597 report on 20m CW.
Then checked transmitted CW monitoring with other radio.
Following is subjective report.

80m >>> 599
40m >>> 599
30m >>> 599
20m >>> 597 Carrier seems to be modurated by hum.
17m >>> 598 Same as above
15m >>> 599
12m >>> 599
10m >>> 599

K2 is far enough from magnetic source.
Changing power (2W, 5W, 10W) does not make any difference.
I do not know why tone is poor only on those 2 bands. 
Any suggestion please.
 
73 de aki, ja1nlx
a.yoshida at post.email.ne.jp
http://www.asahi-net.or.jp/~yy7a-ysd/