Tag Archives: QRM

Dave says not all Jameco power supplies are linear and regulated

Many thanks to SWLing Post contributor, Dave Zantow (N9EWO), who replies to a post published yesterday regarding some of Jameco linear power supplies. Dave writes: “A bit of a caveat on Jameco’s these so called Linear power supplies. This is … Continue reading

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How to replace a noisy wall power supply

Regarding noisy switching power supplies, SWLing Post reader, Dan Lewis, comments: “Google the following: “Jameco linear wall transformer”, and you’ll find a suitable non-switching replacement. Jameco still has a number of linear transformers in their catalog at reasonable prices. I … Continue reading

Posted in AM, Articles, How To, News, Portable Radio, Radios, Shortwave Radio, Tutorials | Tagged , , , , , , , , , | 6 Comments

Sangean blames AM interference on power supply and government regulation

After the Sangean WR-15 received low marks for AM reception in an Amazon review, Bob of Sangean America replied that poor reception is due to the radio’s switching power supply–a design that is federally mandated. Many thanks to Jeff over at the … Continue reading

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Video: How to fight radio noise in urban areas

London Shortwave, a regular contributor to the SWLing Post, lives in London, England and copes with serious amounts of radio noise (QRM) at his home. Unlike many urban radio listeners, the QRM didn’t chase him away from the hobby, rather he looked … Continue reading

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Living in a National Radio Quiet Zone

Many thanks to SWLing Post reader, Paul, who shares this National Geographic video about Green Bank, West Virginia, USA–home of the National Radio Astronomy Observatory (NRAO): My wife and I took a camping trip to Green Bank in the late 1990s … Continue reading

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WSJ: “FCC Agents Trace Radio Interference”

I’m happy to see RFI being mentioned in the Wall Street Journal. Many thanks to SWLing Post reader, Ulis, for the tip: (Source: Wall Street Journal) A federal agent who shows up unannounced at a building along a Texas highway … Continue reading

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Document radio interference via the Ofcom Spectrum Management Survey

Nige (G7CNF) recently contacted me regarding a survey he has created to help document and fight radio interference from power line technology and other sources. If you live in the UK and can create an Ofcom case reference number, please … Continue reading

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