[Spooks] Secret Hidden Signals in China Radio 18160kHz AM Broadcast?

[Brooke Clarke]

Hi:

Bonnie asked the subject question on her HF pack listserver and I 
thought it might also be good for this one.
See the audio waterfall spectrogram at:
http://hflink.com/qrm/chinaradio18160.jpg

73,

Brooke Clarke, N6GCE
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