Tag " QRM"

The negative LED Lights impact on HF radio reception: http://youtu.be/o8zMhjXcmoA Video by Thilo Kootz, DL9KCE


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The October issue of the IARU Monitoring System (IARUMS) newsletter reports that the intruder situation on 28 MHz is getting worse. It says "We found much CB-like traffic (AM, FM, SSB) between 28 and 29.7 MHz in September and again in October 2011. Origins: Europe, Brazil, Far East. Besides that we observed, that the band is still crowded of numerous CIS taxi-cabs in FM. The conditions on the upperbands...


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Uli, DJ9KR reports on efforts to resolve the problem of taxi drivers in the Russian Federation using 28 MHz FM. On the IARU region 1 website his writes: Dear fellow Intruder Busters, More than a year ago (24 October 2010) I asked the Headquarters of SRR, Box 88, 119311 Moscow (attention Roman R. Thomas RZ3AA, Yuri B. Malyuk RA4AR) for assistance because of the big number of illegal taxis...


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Outstanding QRM (Splatters) from Ukraine Contest Station US1I during the CQWWDX Contest 2011 (Phone). From almost 14185 KHz to 14210 KHz in 14200 Central Frequency (> 25 KHz !!!). httpvh://www.youtube.com/watch?v=7p746-KmGhU


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More an more LED lights are entering the market and are being used by radio amateur and their neighbors. There is a limit to maximum disturbance voltage on the mains port defined in EN55015, which is equivalent to the protection of EN55022, however it is not fully implemented within the EU due to a transition period of the standard. As consequence, we can observe some LED lights causing only little...


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Well an interesting time has been had by all in the past week. A Radio Amateur in Northern California, inadvertently pushed a keyboard up to his keyer, which produced a stream of dots at 25 WPM for well over a week. An international effort from Region 3 bringing in Region 1 via the Intruderwatch and various posts to DX Clusters and Yahoo groups eventually resulted in the Radio Amateur being...


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“The new device I designed, named Wave Bubble, is intended to defend the user’s personal space from unwanted wireless communication by creating a personal “cold spot” bubble where RF devices such as those mentioned do not function.” Attached below is a thesis submitted for partial fulfillment of a Bachelor of Science in Electrical Engineering and Master of Engineering of Electrical Engineering...


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