|Gimpo, South Korea|
Gimpo Siren Jammer (South Korea), transmitting on 1053 kHz (MW), was logged here in Malaysia on 13 and 14 December 2016. Their signal rated a SINPO of 43423. While their transmission is designed to jam Pyongyang Broadcasting Station in Haeju (North Korea) -- a super-powered station rated at 1500 kW -- it was heard mixing with two Asian stations, one being a Chinese broadcaster at 12.20 UTC and possibly RRI Jayapura (Papua) at 13.30 UTC. Signal was prominent, although not a major disturbance, to the Chinese and Indonesian stations when it faded under. Transmission was observed from 12.20 UTC onward till 14.30 UTC. Additionally, at 19.30 UTC, a Thai station (possibly "Suan Misakawan" -- Monthon Thahaan Bok Thii Sip-Et in Bangkok) and another weaker Asian station (possibly JOAR in Nagoya, Japan) was received; at 22.20 UTC, no jamming was apparent, only an Asian broadcaster.
This is one incredibly powerful transmitter for it to reach Kuala Lumpur -- a distance of 4,600 km!!!
HERE's an audio file of the Gimpo Siren Jammer.