[Elecraft] K1 internal signal generator?

[Craig Rairdin]

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.
 
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