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Re: [IRCA] 621-Pyongyang BS/ VoK-- Audio Situation Becoming Critical
Didn't the discussion also cover whether the hum increases in
intensity as Chongjin fades down, and decreases as it dominates the
frequency? I believe that increasing hum with increasing Chongjin
signal strength would indicate that the hum is part of Chongjin's
signal, rather than due to the heterodyne with other signal(s).
best wishes,
nick
At 20:46 2018-11-06, Mauno Ritola wrote:
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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Nick Hall-Patch
Victoria, BC
Canada
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