Log: AM BCB, September 15th, trans-Pacific reception

I’ve done SDR recordings on about half of the mornings this month with my 7’x24′ Conti superloop (corner-fed, corner terminated broadband loop), RTL-SDR dongle, and Ham It Up upconverter. This morning was the best so far, with audio from several stations, and fairly decent audio from 972 kHz out of Korea. It also exhibited a pattern I’ve been seeing where I get good Japanese reception shortly after their sunset, and another enhancement shortly before my sunrise. The latter is common, but the former has been quite noticeable this month. In the following log, I list all the 9kHz frequencies where I had at least a medium carrier within 20-minute intervals from 0935-1315UT (2:35-6:15am MST). Signals dramatically weakened around local sunrise of 1312UT (6:12am MST). My frequency coverage only went up to 1400 kHz due to filtering to remove strong locals at 1450 and 1490.

First, for the IRCA mailing list members who have already seen this log, here is the audio sample at 12:57:30UT from 972-HLCA with some splatter from 970:

And, the 20-minute log:
0935-0955
Weak audio: 747 and 774 around 0936-0938
Strong carriers: 594, 693
Medium carriers: 828, 1053, 1134

0955-1015
Strong carriers: 693, 774, 1053
Medium carriers: 594, 747, 828, 1134

1015-1035
Medium carriers: 594, 693, 747, 774, 828

1035-1055
Medium carriers: 693, 774, 828

1115-1135
Medium carriers: 594, 693, 774, 828, 1053

1135-1155
Medium carriers: 693, 774, 828, 1053

1155-1215
Strong carriers: 774
Medium carriers: 693, 828, 972, 1053, 1134

1215-1235
Weak audio: 972 from 1215-1219UT
Strong carriers: 774, 828
Medium carriers: 747, 1053, 1134

1235-1255
Medium audio: 972 from 1247-1250UT (other bursts of weak audio)
Weak audio: 774 at 1251UT, 828 at 1239UT
Strong carriers: 747, 972 (near audio at 1254UT)

1255-1315
Medium audio: 972 from 1255-1301UT, quite decent around 1258UT, mix of talking and music
Weak audio: 774 at 1258UT, 972 continuing until 1304UT
Strong carriers: 693, 1053
Medium carriers: 594, 747, 828, 864, 936, 945, 954, 963, 1008, 1044

1315-1335
A few lingering medium carriers after local sunset, inc. 828, 974

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