Tag: Interference

Cell Tower Next Door Marker Lighting System Interfering On 10 Meters.

Where do I even start? I live next door to a cell tower site and recently seen a fella climbing the tower to repair some of the red marker lights that are solid on at the middle of the tower and of course one or two red markers that blink off/on in the very top. This has been a couple week back since I was interested enough to stop and watch the fella do his unique job. Today I was scanning through the bands and found myself checking 10 meters due to finding a good little opening Sunday…

Original Article

Measuring spectrum pollution video

The RSGB has released the video of the RSGB Convention lecture by Alwyn Seeds, G8DOH, Measuring Spectrum Pollution at VHF and UHF. This lecture is the basis for the article in the January RadCom written in conjunction with John, G4BAO on the same subject.

Original Article

Results of the VDSL interference survey

The EMC Committee would like to thank all 1,200 radio amateurs who took part in the VDSL RFI survey. The results have been analysed and were presented at the RSGB 2017 Convention. You can see a pdf of the PowerPoint presentation or watch the video of EMC Chair John Rogers, M0JAV presenting the findings at the […] Original Article

ARRL Reminds Amateurs to Keep Clear of Frequencies Designated for Puerto Rico-Caribbean Emergency Response

ARRL reminds Amateur Radio operators that emergency communications are taking place on and around 14.265, as well as other frequencies. Please avoid these frequencies whenever possible, to allow for emergency communications to transpire clearly and efficiently.

If you must be on the air in the vicinity of these frequencies, please allow emergency operators at least 2 or 3 KHz on each side. Thank…

Original Article

Improving Switch Mode PSUs for noise

I’ve never been into switch-mode power supplies . . .

But preumably the reason they radiate so much RF noise is because they chop the mains into a high-frequency square wave signal, that can then be transformed using a small transformer.

So I presume those that are quiet (in terms of RF hash) use inductors and capacitors to round off the edges of the square waves. (rather than just relying on RF filtering of the DC output, by which time it’s too late . . . as the hash seems to…

Original Article

UK VDSL interference survey extended

The RSGB EMC Committee has been investigating VDSL broadband interference on the HF amateur bands for three years now. To increase the amount of evidence available, the Committee set up a survey to collect current signal levels at the frequencies of VDSL band transitions. There are still lots of responses being received so the deadline […] Original Article

Not All “Intruders” on Ham Bands are Illegal — But a Lot of Them Are

The monthly newsletter of the International Amateur Radio Union Region 1 Monitoring Service (IARUMS) typically makes for some interesting reading. While the reports that come from more than two dozen contributors in Europe and Africa can be a bit visually dense, the content conveys the impression that that there are myriad intruders on the Amateur Radio bands. However, not all of them are illeg…

Original Article

Report VDSL interference NOW!!!

For three years the RSGB EMC Committee has been investigating the problems of interference from VDSL broadband on the HF amateur bands and lobbying for action to reduce the problem. It has a lot of historic data, but both Ofcom and Openreach contend that 150 reports from 50,000 amateurs are not indicative of a major […] Original Article

VDSL ‘Drive-By’ interference monitoring system

On his web site Martin G8JNJ says about 50% of his amateur radio friends are currently suffering severe interference from Broadband internet VDSL services that are carried by conventional copper phone lines
For the full article, http://www.southgatearc.org/news/2017/august/vdsl-drive-by-interference-monitoring-system.htm

Original Article

Radio Eritrea and Radio Ethiopia Still Battling on 40 Meters

It was a now-familiar story in the July edition of the International Amateur Radio Union Region 1 (IARU R1) Monitoring System (IARUMS) newsletter, which reports that Radio Eritrea and Radio Ethiopia are still slugging it out i the 40-meter phone band. IARU Region 1 includes Europe, Africa, the Middle East, and Northern Asia.


“The hostile brothers were daily active on 7,150 and 7,175 kHz,” said I…

For the full article, http://www.arrl.org/news/view/radio-eritrea-and-radio-ethiopia-still-battling-on-40-meters

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