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Re: [IRCA] South Korean MW Jamming
At 14:27 02-12-16, Chris Kadlec wrote:
The Gimpo jammer, while I have no absolute proof of it (they don't
share this information, obviously) is aiming south. Why? The purpose
of jammers isn't to defeat the signal they're up against. You don't
aim *at* the signal you're jamming. AM radio - even FM - doesn't
work like that. So aiming it northwest would be a futile effort
against a 1,500kw powerhouse. 1053 Haeju clocks in at 75-80dBu at my
DX site in Incheon, 61 miles from its tower. Clear water path does
damage. There is no defeating that signal and it's a ridiculous
attempt to hope to. So the point of the jammers is to cover the
signal by any means necessary to the majority of the population. 50%
of the nation's population - 26 of 51 million - live in the Seoul
metro area. The aforementioned main Seoul site does a half-decent
job at covering the most densely populated area. On the east side of
the city, the Taereung experimental site fills in a few areas if
necessary. The Hwaseong jammer site (which went full power on 11/21
after a year-plus of testing) is now taking care of the south and
far south suburbs. The purpose of the Gimpo siren jammer is to cover
Incheon. Incheon is a major city that is connected to and is part of
the Seoul metro area and it's a coastal city. 1
Of course, makes perfect sense Chris. I wasn't thinking about the
location of the jamming transmitter. (or thinking at all perhaps)
I'm not sure about 1566 and rebroadcasting audio. It may be another
phenomenon, though things change year by year in the area.
I guess my question was more about whether this is a specific style
of jamming (which I'd incidentally heard on 1566). I'd never
heard it before, and it sounded like rebroadcast audio of the
targeted station. Do you know if that is what is happening in your example?
(This one is used at tourist sites along the DMZ. This is recorded
less than 10 miles from the tower of 50kw 810 KCBS while standing
beside the North Korean customs booth a half mile from the actual
border, but a 60dBu silent signal very closeby is muffling it. These
are mounted on little sticks on the side of buildings like 10-watt
transmitters.)
It sounds as if you're suggesting the distortion is only the muffling
from the nearby open carrier...which I'm assuming I didn't have when
I heard something similar on 1566.
best wishes,
Nick
Nick Hall-Patch
Victoria, BC
Canada
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