We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Author Topic: Siren Jammer 9855 AM 11:29z-11:30z 12-05-12  (Read 1851 times)

Offline Sealord

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 2316
  • North East Florida
    • View Profile
Siren Jammer 9855 AM 11:29z-11:30z 12-05-12
« on: December 05, 2012, 1331 UTC »
Never heard this type of jamming signal before - the broadcast station sounds Asian so I'm guessing China is running the jammer against it?

Audio (11:29z-11:30z): http://archive.org/download/ShortwaveOddsSodsTransmissions/SirenJammer9855Am1129z-1130z12-05-12.mp3

You can actually hear the 'siren' loop from 00:10-01:19 on the mp3

Indoors: WR-G33DDC & TT RX-340_DX Eng. 4-Square Array / Outdoors: Belka-DX_Whip / Poolside: SMC HF-150_MMD-40 (D.O.G.) / Off Air/Studio Recordings

cmradio

  • Guest
Re: Siren Jammer 9855 AM 11:29z-11:30z 12-05-12
« Reply #1 on: December 05, 2012, 1738 UTC »
Or N. Korea.

They be paranoid there.

Peace!

Offline mr. mike

  • Jr. Member
  • **
  • Posts: 79
  • West Coast
    • View Profile
Re: Siren Jammer 9855 AM 11:29z-11:30z 12-05-12
« Reply #2 on: December 06, 2012, 1735 UTC »
It's some sort of religious broadcast that they're trying to jam because the station is playing "The Old Rugged Cross." The Chinese Firedrake would do a much better job at obliterating the signal, so I'm guessing the station is trying to reach Vietnam, Laos, or North Korea; I know that Vietnam and North Korea have jammed signals before.
"I will not be filed, indexed, briefed, debriefed, or numbered." - Number 6

Offline Token

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 2116
    • View Profile
Re: Siren Jammer 9855 AM 11:29z-11:30z 12-05-12
« Reply #3 on: December 13, 2012, 2003 UTC »
The Siren Jammer is most frequently used by Vietnam, they also have a couple of other jammer types but the Siren seems their favorite.  And, since the station scheduled in that time/freq/day slot is the Far East Broadcasting Company, the FEBC is a religious broadcaster, and the program language at that time is Vietnamese, I am going to say the most likely canididate for source of the jammer is Vietnam.

T!
« Last Edit: December 13, 2012, 2007 UTC by Token »
T!
Mojave Desert, California USA

 

HFUnderground T-Shirt
HFUnderground T-Shirt
by MitchellTimeDesigns