{"id":1555,"date":"2023-04-12T07:26:30","date_gmt":"2023-04-12T01:56:30","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=1555"},"modified":"2024-02-08T08:00:34","modified_gmt":"2024-02-08T02:30:34","slug":"radiofrequency-interferences-at-home","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/radiofrequency-interferences-at-home\/","title":{"rendered":"Radiofrequency Interferences at Home!"},"content":{"rendered":"

Radiofrequency Interferences at Home!<\/span><\/h2>\n
\"Radiofrequency
Radiofrequency Interferences at Home!<\/strong><\/span><\/figcaption><\/figure>\n

I have been wondering why my VHF base station shows 4 to 5 segments of signal on almost all frequencies in the evening while there is none in the morning. Today I came upon the potential sources of RF interference at home and it is a huge surprising list! Here are some of them which may surprise some of you as well:<\/p>\n

    \n
  1. Switch mode power supply which is widely used in mobile phone chargers and uninterruptible power supply. Fortunately my VHF equipment uses a linear, transformer based power supply.<\/li>\n
  2. Computer and television monitors. You can’t avoid a computer monitor in the shack these days, especially if you plan to go for the digital modes.<\/li>\n
  3. Fluorescent tubes which used to be my favourite light source earlier, being phased out now.<\/li>\n
  4. Plenty of LED tubes and bulbs now common place in all homes.<\/li>\n
  5. Powersupply or the so called driver units of LED lighting, which are switch mode power supplies generating RF.<\/li>\n
  6. Add to this list, the kitchen refrigerator, which is now-a-days a ‘smart refrigerator’ with possible connection to its app by scanning a QR code.<\/li>\n
  7. Almost any other ‘smart device’ like modern air-conditioners, robotic vacuum cleaners, all have their own footprints in the radiofrequency spectrum.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    Radiofrequency Interferences at Home! I have been wondering why my VHF base station shows 4 to 5 segments of signal on almost all frequencies in the evening while there is none in the morning. Today I came upon the potential sources of RF interference at home and it is a huge surprising list! 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