Or could the hum be just heterodyne caused by 50 Hz difference between
Chongjin tx and Heilongjiang? I checked via a Japanese receiver and I
don't see strong side carriers, which would be typical for mains hum
otherwise.
Mauno
Gary DeBock kirjoitti 6.11.2018 klo 9:25:
A few months back there was a discussion on the list about the transmitted
audio from the 621-Pyongyang BS/ Voice of Korea station in Chongjin, N. Korea--
specifically, whether there was audio hum on the frequency from a bad
transmitter, or whether the bad audio was caused by a drifting frequency.
Yesterday morning a recording was made of 621-Pyongyang BS mixing with
621-China (Heilongjiang) at the 1500 TOH, with the two sets of pips loudly
overlapping at the 39 second point
https://dreamcrafts.box.com/s/612kbk25hqqlxh1r4qfzaxzeuuwktbeo
The throbbing hum from Chongjin's transmitter is pretty obvious, distorting not only the
Pyongyang BS audio but also covering Heilongjiang's clean signal. The overlapping time
pips from the two are in the same bizarre league as the "Cuckoo Clock"
overlapping pips from 918-Shandong and RNZ at 1700 UTC in the Cook Islands.
Gary DeBock (DXing in Poipu, Hawaii)
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