[Spooks] SK01, WYFR, and a sine wave

[KC2TTK]

Two clarifications and a question re:

>     Freq ENIGMA Day   MMDDYYYY  UTC  Mode
> -------- ------ --- ---------- ---- -----
>     5947   SK01 Sat   10022010 0900   AM


> [08:59:15Z] High-pitched wail

After doing a quick-n-dirty audio job, I've determined that it's a  
solid 3KHz sine wave.  After a little research, I found that WYFR  
transmits on 5950KHz, so the frequency of the tone makes some sense.

That said, *why* am I hearing this in the first place?  When WWCR and  
V02a butt heads, all I hear is the overlapping crosstalk; with SK01  
and WYFR, it's as they're doing a cheap and irritating Emergency  
Broadcast System imitation.  If anyone could shed some light on this  
curiosity, I'd appreciate it.

> [09:11Z, 09:16Z, 09:22Z, 09:26Z] Possible SK01 Tx

I see faint traces of SK01 transmissions in the spectrogram beginning  
at 08:59:50Z, 09:04:50Z, 09:09:50Z, 09:14:50Z, 09:19:51Z, and  
09:24:51Z.  What I probably heard was the closer/footer tone of RDFT  
instead of the header tone.

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