Unidentified Radar Jamming on 7MHz

Unidentified Radar Jamming on 7MHz

We have suffered the damage of this unidentified noise and we are in trouble very much. This noise comes here about four or five days per week. We can hear it from 4PM to next day 8AM. It is impossible for us to receive weak DX signal on 40m band. This is a severe trouble for us. This noise has been coming since Spring of 2005. You can see the noise situation by this video http://jp.youtube.com/watch?v=AthoPqyWy_M
In this Video, You can see the S meter changes while I turn my 40m 4element yagi. I also recorded the noise by changing RX frequency.

The noise masked for 6970KHz to 7035KHz at 19:46jst(10:46utc) on April 24, 2008. We have to give up QSO for Caribbean Sea and East coast station on CW. The width of this noise is about 65 to 70 KHz. Depending on the day or time, the center frequency of this noise shifted up and down. We often have the other pattern which masked for 7025 to 7090 KHz.

I looked for the source direction by 4element yagi. It seems to be the direction from Tokyo to 230-250deg.

I would like to have your information about this noise.

Best regards
Hisato JA1DOT

Category:

Science & Technology

Tags:

• 7MHz
• 40m
• DX
• radar
• jamming
• noise
• ham

[jf1zzg]

Hello OM, Yes, This is the definitely the same drangon QRM which come from China. He resumed the operation from the next day of the closing ceremony of the Olympic Games

[dofty]

@pankeiko It's an antenna rotator.

[pankeiko]

Hello! I am very curious, What is that devide with whe blu-yellow circle on it? What is it meant for?

[Flankymanga]

Guys and are you sure this isnt a over the horizont radar just like the woodpecker grid in the old times?

[TeamYankee2]

This has nothing to do with RADAR... doh!

Woodpecker over the horizon radar is long gone.

[KC8YOQ]

Sounds sorta like the OTHR Russian woodpecker of the 70ies and 80ies

[wwwtotalitaerde]

This sounds like jamming to block a number station or broadcasting. I´ve recorded similar jamming on multiple bands near Karlsruhe/Germany in 2007, see videocomment. My brother Markus Bott had been tortured by the German BND during five and a half years. On july 11th 2009 he was assasinated in Karlsruhe. Just because of our homepage on Secret Service technology, link on my channel, and our book Der Totalitäre Staat.

Martin Bott

[dieselscience]

jf1zzg,

I think you are correct. China is doing MASSIVE illegal jamming for the last few years.

[00048480]

kinda scary sounding, like an old Atari game.

[tsc0001]

Hi - do you think that the signal portrayed here is the same on that I have posted last night?

Thanks