Tag Archives: Jamming

Radio Eritrea and Radio Ethiopia jamming intrudes on amateur frequencies

eritrea-ethiopia

Many thanks to SWLing Post contributor, Vlado (N3CZ), for sharing the following story from the South African Radio League newsletter:

Broadcasters, jammers wreak havoc on amateur radio frequencies

The ARRL reports the battle in the amateur radio 7 MHz band continues between Radio Eritrea and Radio Ethiopia, which is said to be jamming the Eritrean broadcaster with broadband white noise

The problem for radio amateurs is that the battle is taking place in the 40 meter phone band 7,145 and 7,175 MHz with the jamming signal reported by the IARU Region 1 Monitoring System (IARUMS) to be 20 kHz wide on each channel.

The on-air conflict has been going on for years; Ethiopia constructed new transmitting sites in 2008 and is said to use two or three of them for jamming purposes. The interfering signals can be heard in North America after dark.

According to IARUMS Region 1 Coordinator Wolf Hadel, DK2OM, Radio Eritrea is airing separate programs on each frequency. He said in the IARUMS September newsletter that telecommunications regulators in Germany, Austria and Switzerland have been informed, so they could file official complaints.

Read the full ARRL story at
http://www.arrl.org/news/broadcasters-jammers-wreak-havoc-on-amateur-radio-frequencies

IARU Region 1 Monitoring System latest news
http://www.iarums-r1.org/iarums/latest.pdf

North Korea intensifies shortwave jamming

FlagNorthKorea

(Source: DailyNK via Andrea Borgnino)

North Korea has been from the beginning of March continually signal jamming radio broadcasts on the shortwave frequency used by the South Korean non-profit broadcaster Unification Media Group (UMG). Given the present situation, in which North Korean residents might be influenced by outside information condemning the regime and explaining the purpose of the sanctions imposed by the United Nations, the regime has showed the will to block sources of outside information that might cause unrest.

The shortwave frequency […] in question, 7515 [kHz], has been actively jammed starting on March 1st making it extremely difficult for North Korean listeners to tune in. On the 15, UMG organization began using three receivers to test out reception at that and adjacent frequencies on a daily basis and was able to confirm that the exact signal is being jammed.

The blocking effort is being concentrated on the time period from 10pm- midnight. Specifically, from 10-11pm the jamming is very strong. The signal jamming is undetectable from midnight to 1am. The signal blocking became weaker at midnight on March 15, from which point onward the entire three hour broadcast was audible. Starting on the 17, UMG moved the frequency, but the jamming operators seemed not to notice because the interference continued on the old wavelength.

Continue reading at the DailyNK online…

Empire of Noise: a documentary about jamming

Many thanks to SWLing Post contributor, Gary Wise (W4EEY), who writes:

I stumbled over an interesting documentary on radio jamming. You have probably seen it, but just in case you haven’t, here is a link.

I had not seen this before, Gary.  Thank you!

Is Firedrake on the decline?

(Photo: Satdirectory.com)

(Photo: Satdirectory.com)

Have you noticed less Firedrake broadcasts lately? I certainly have.  My buddy David pointed this out to me last week and since then I haven’t heard Firedrake even once. I have, however, heard the more aggressive and noisy Chinese jamming techniques.

Perhaps it’s just a “watched pot never boils” situation? I’m not sure; some SWLs on the hard-core DX reflector have also noticed a lack of Firedrake across the bands.

Have you heard Firedrake lately? Please comment with loggings.

For readers who are unfamiliar with Firedrake, check out this previous post.

Australia Network News: Broadcast group condemns China over radio jamming

OHtower(Source: Australia News Network)

An international broadcast association has condemned the deliberate jamming of shortwave broadcasts, including those from the ABC’s Radio Australia service, into Asia.

The Association for International Broadcasting (AIB) says English-language broadcasts from Radio Australia, the BBC World Service and the Voice of America are being jammed.

Chief Executive Simon Spanswick has told Radio Australia’s Connect Asia program research has indicated the jamming signals appear to be coming from within China.

“It appears to be quite wide,” he said.

“We’ve been talking to some monitors who keep ears on the shortwave bands around Asia and they say that it’s certainly audible well outside China.

“So, one imagines, even with the geographic scale of China itself, that this is right across the region.” […]

“What the Chinese have done for a long time is actually broadcast Chinese folk music [see our previous posts on Firedrake]…what’s happening in this case is that they’re transmitting a different sort of noise.

“The aim is to simply make it so uncomfortable to listen to that people switch off and don’t bother trying to listen to the program that they wanted to get.”

The AIB has lodged protests over the jamming with the Chinese embassies in Washington, London and Canberra.

[Continue reading…]