Radiovibrations - Offset DX

930 KHz

waterfall diagrams received in Handewitt, Germany

This is one of the best known frequencies for overseas DX in Europe. 927 KHz is almost free and two strong stations from east Canada can regularly be heard: CJYQ St.John's, NF and CFBC St.John, NB. But this is only the tip of the iceberg. During the night more than 40 carriers appear. Overseas signals can be detected almost all day. Only two hours around noon are quiet. Surprise: a station in the afternoon possibly via grey line effect. Could it be powerful CJCA Edmonton? Not sure because of the slightly unstable carrier. Now in 2015 CJCA seems much more stable. These are the stronger ones as listed in MWLIST. But it's possible that back in 2009 offsets were a bit different.
929.9972 CJCA, The Light, Edmonton (AB) 50 KW 929.998 CJYQ, St John's (NF) 20 KW 929.9998 CFBC, Saint John (NB), 50 KW 930.0020 WPAT, Paterson (NJ), 5KW 930.0038 WBEN, Buffalo (NY), 5 KW 930.0048 KSEI, Pocatello (ID), 5 KW 930.008 KNSA (AK), Unalakleet, 4.2 KW 930.0097 KYAK, Yakima (WA), 10 KW

Long time observation 14-Nov-2009 / 15-Nov-2009

(700K, very large scale)
spectrum waterfall 930 KHz
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CFBC
CJYQ
WPAT
WBEN
Minsk beacon?
afternoon fade in: CJCA via grey line?
same effect CFBC? Or some west coast station?
CJYQ dusk fade in
multipath distortion
CJCA(?) ducking off: noon in Edmonton
CFBC following an hour later
another hour till dusk in NJ/NY
drifting starts at 5 UTC. Same the night before
receiver drift due to slight change in room temperature
this time a weaker afternoon phenomenon
later fade ins from Central/South America or US west coast

offset frequency list & 24h graph at fmscan.org