Alpha (RSDN-20) navigation, 14.88 kHz, probably Khabarovsk (RUS)
Heard by KPH Kiwi US west coast and S7 on Khabarovsk Kiwi (shown below). No other Alpha sigs active that might otherwise ID station by transmission pattern as extension shows. Actual station location is about 210 km NNE of Khabarovsk near Elban.
Comments
I remembered to look this AM from the house here in Colorado. I know nothing about Alpha. Is this it?
Would pretty much have to be. Congrats. Nothing else would integrate like that to such a degree. I presume you can't actually hear it even in CWN mode. Look at all the 60 Hz harmonics too, lol.
I didn't actually listen for it with CWN but you are probably right that I wouldn't hear it.
This is from the very broadband Single Antenna system
only 15m from the house and neighbors so not surprisingly I do see 120 Hz (FW rectification of 60 Hz) family of lines. But these lines aren't really so terribly large and do vary during the day, even disappearing sometimes, so I'm able to see what I think are the expected ITU noise variations <10 kHz .
I really don't know much about this part of the spectrum but it seems that I can receive it with the Kiwi which though it has low frequency roll off does better than many other SDRs down there.
I guess maybe I should put an electret microphone outside and see what I can 'hear' that way.
In the "good old days" (1980s) several of us would go out to Point Reyes (the same location Rob has installed all the Kiwis at KPH) and listen with audio frequency EM receivers for natural radio phenomena (e.g. whistlers). And you could always hear Omega up at 10-14 kHz (US equivalent to RUS Alpha, long gone).
I haven't checked for whistlers but I did go back and found that Alpha was Q5 in CWN on the 6m SA system here at the house:
This at 1430 UTC from Northern Colorado and pretty far from any water path that would probably have helped !