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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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