You have probably heard it, but did not know quite what to make of it- it does sound unusual. There are several sound files. try:
Numbers and oddities go to Download, then to Sound Samples, you will see New DGI mode: RDFT about third of the way down- this is SK01.
We don't have any Cuban Embassies, there is a Cuban Interests Section on the East Coast. How they distribute thier Key material and what not escapes me ?
In contrast, if I understand this correctly the Russian Consulate in Seattle is located in the Westin Building- a major telecommunications hub ? This gets to deep for me, I may just stick to building itsy bitsy little Radios and Morse Code. Cheers.