[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [IRCA] South Korean MW Jamming
Thanks for doing this Chris. The subtleties are endless.
Couple of questions. These are all originating in South Korea, is
that correct? (except for video games on 819?)
\\
further:
This is the Gimpo siren jammer, THE most powerful jammer in Korea at
250kw, aimed south and on 16 1/2 hours a day, yet still stupidly
leaving a full hour a day unjammed. While it's the most heard in the
country, the dinky Seoul jammer 16 miles away is the one that gets
out across the entire globe but can barely cover a 50-mile radius in
Korea. We suspect its power is going up to the sky (or due north) as
opposed to covering the ground as it should be.
Gimpo being in South Korea, what is it jamming from the
south? (which might be why we don't hear it on northerly
paths?) This siren is what I heard on 1053 years ago, have a
recording from 2007; the recordings from 2008 are without sirens. I
don't think I've heard the sirens since then.
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.
I've heard something like this earlier this year on 1566. They're
taking the audio of the originating station, distorting somehow and
rebroadcasting?
best wishes,
Nick
At 09:45 29-11-16, Chris Kadlec wrote:
Here's a little bit about different jammers on the South Korean side
of things for those who are interested. I have been sifting through
40 hours of unedited recordings of East Asia MW over the past week
or so and can now view them in a more organized fashion than when I
presented on the same topic in Madison last August (for the few of
you who attended) with basically no preparation whatsoever. I'll
leave the North Korean side of things for another time as they have
their own unique sounds, especially the big metro Pyongyang
frequencies (891, 900, 1143, 1467, 1566, and 1584, not to forget the
freaking 75 kHz-wide 711 that wipes out a fair chunk of the Seoul
daytime band).
I'd like to share nine clips. Some are experimental while others are
24/7 permanent. The experimental site south of Seoul just came
online with 24/7 full-power jamming with the obvious end result of
their long-term testing and I'm not including that in here, though
it's not drastically different from what's heard here (just more annoying).
First, here's the most basic form of the jammer the ROK has been
using for some time. It's just the raw sound with nothing additional
added in yet. This was at the experimental site 7 miles from my FM site.
http://www.beaglebass.com/dx/external/Jammer_Basic.MP3
Next, this is the standard jammer that has been used more or less
for the past year in Seoul. Note the same sound with sirens added.
There are minor differences now and then.
http://www.beaglebass.com/dx/external/Jammer_Standard.MP3
My arch-nemesis, the hum jammer. They're using these on multiple
frequencies and via skywave and groundwave, I cannot identify the
locations and they clog otherwise-listenable frequencies from China.
This particular one is on 855 and near the coastal border.
http://www.beaglebass.com/dx/external/Jammer_Hummer.MP3
This is the Gimpo siren jammer, THE most powerful jammer in Korea at
250kw, aimed south and on 16 1/2 hours a day, yet still stupidly
leaving a full hour a day unjammed. While it's the most heard in the
country, the dinky Seoul jammer 16 miles away is the one that gets
out across the entire globe but can barely cover a 50-mile radius in
Korea. We suspect its power is going up to the sky (or due north) as
opposed to covering the ground as it should be.
http://www.beaglebass.com/dx/external/Jammer_Siren.MP3
Put them all together - the basic, standard, siren, and hummer, and
you end up with this. This is a single jammer near the experimental
site, meaning they have added it all together into one signal for
that day anyway.
http://www.beaglebass.com/dx/external/Jammer_Angry.MP3
This one was heard in mid-June from the southern experimental site.
I'm not even sure how to describe it... like a rubber band rapidly
hitting something over and over. Annoyingly effective, but just a
test. Never heard before or since.
http://www.beaglebass.com/dx/external/Jammer_Static.MP3
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.
http://www.beaglebass.com/dx/external/Jammer_Low_Power.MP3
My favorite of all: the "now you hear it, now you don't, ha ha!"
jammer from the southern experimental site. 1 min 40 sec of jamming,
40 seconds of no jamming, repeat. Local 657 Pyongyang can be heard
in the lack of jamming, at noon.
http://www.beaglebass.com/dx/external/Jammer_Intermittent.MP3
And lastly, there is the jammer warfare with the two sides jamming
each other. The video game-like jammer is 819 Pyongyang. The other
jammer is the standard Seoul jammer.
http://www.beaglebass.com/dx/external/Jammer_Warfare.MP3
-Chris Kadlec
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca
Opinions expressed in messages on this mailing list are those of the
original contributors and do not necessarily reflect the opinion of
the IRCA, its editors, publishing staff, or officers
For more information: http://www.ircaonline.org
To Post a message: irca@xxxxxxxxxxxxxxxx
Nick Hall-Patch
Victoria, BC
Canada
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca
Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers
For more information: http://www.ircaonline.org
To Post a message: irca@xxxxxxxxxxxxxxxx