[Elecraft] K1 internal signal generator?

[Craig Rairdin]

I didn't get any responses to this question last week so I'm going to try it
one more time:

The K1 manual makes a very, very brief mention of using an internally
generated signal to calibrate the receiver. It seems to indicate this signal
is at "99.7". With an antenna disconnected I hear a carrier that is
definitely in the neighborhood of "99.7" on 40, 20, and 15M, but on 30M I
don't hear it. OTOH, I set it up with 10.1 MHz as the low end of that band
so maybe the signal is at 9997 KHz and that's why I'm not hearing it. (I do
hear a carrier around 10.170 MHz with no antenna connected.)
 
So... am I understanding that this signal does exist and its purpose is to
calibrate the receiver or am I not understanding the sentence fragment that
mentions this signal? And is there something I can use on 30M?
 
FYI the K1 is my only radio so I don't have anything to calibrate it
against. 
 
Craig
WB0GUU