3 ms·
AM is a type of modulation; commercial aviation uses AM in the 108 to 130 MHz range; the military uses AM in the 300 - 400 MHz range; I'm sure there are amateur
by mikece 5y ago
AM is a type of modulation; commercial aviation uses AM in the 108 to 130 MHz range; the military uses AM in the 300 - 400 MHz range; I'm sure there are amateur radio operators using amplitude modulation at SHF frequencies and higher for grins if nothing else.
A better title is "How is a portable medium wave or longwave radio receiver possible?"
- munchler 5y agoThe article is about "AM radio", which I think is commonly understood to be medium wave (also known as "AM band") transmissions. https://www.fcc.gov/general/am-radio https://www.fcc.gov/general/am-radio
- TurkTurkleton 5y agoIt must pain you deeply whenever you look at your car radio and it says "AM" and "FM" instead of "medium wave" and "ultra-short wave".
- implements 5y agoIt’s not a deep pain - but it jars a bit once you’ve learnt you can broadcast AM on high frequencies and FM on low. For a domestic radio, AM / FM just means low / high fidelity, and users just see two sets of numbers 520 to 1602, and 88 to 108 (in the UK). I doubt most people belly feel the physics of it, or that the latter is higher frequency than the former.
- RF_Enthusiast 5y agoThe band name is actually a recent issue with broadcasting on the AM Band in the USA. The FCC now allows for AM medium wave broadcast stations to convert to digital (HD) only. This causes many engineers to cringe at stations using branding such as "Digital AM"[1] or "AM HD" since there's no AM involved. Even the FCC calls it "All-Digital AM Broadcasting"[2]. [1] https://www.am1230digital.com/ https://www.am1230digital.com/ [2] https://docs.fcc.gov/public/attachments/FCC-20-154A1.pdf https://docs.fcc.gov/public/attachments/FCC-20-154A1.pdf
- munchler 5y agoIt’s fun when a technology evolves beyond its original name. E.g. Taping a song, filming a movie, dialing a phone, etc.