Path: ...!Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Sat, 04 May 2024 11:29:44 +0000 From: John Larkin Newsgroups: sci.electronics.design Subject: Re: AM radio law opposed by tech and auto industries is close to passing Date: Sat, 04 May 2024 04:27:57 -0700 Organization: Highland Tech Reply-To: xx@yy.com Message-ID: References: <49fhgkxdv5.ln2@Telcontar.valinor> X-Newsreader: Forte Agent 3.1/32.783 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 37 X-Trace: sv3-jNSavQ07+nNmzVowlRtnQD3qzfiH67yxJFrRtXy9Bqcl/bfkgMBbpDR00gQ09G6pTMhxqZxkobufU80!Ipb+MPtL5SvjCBkySuKNfogrkUyTutKxtOvcujhNM8vXIH7skn9ACgWpbJao0azNJKjwQWEBkk8+!tf5xBQ== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2633 On Sat, 4 May 2024 12:29:24 +0200, "Carlos E.R." wrote: >On 2024-05-03 17:43, John Larkin wrote: >> On Thu, 02 May 2024 05:24:08 GMT, Jan Panteltje >> wrote: >> >>> AM radio law opposed by tech and auto industries is close to passing >>> https://arstechnica.com/cars/2024/05/am-radio-is-a-lifeline-lawmakers-say-tech-and-auto-industries-disagree/ >>> A recent test of the emergency alert system found only 1 percent got it via AM. >>> >>> Strange. most is FM these days, or digital? >>> Something to do with Soros buying radio stations ;-) ? >> >> AM radio is a century-old technology. It makes more sense to push >> microwatts of light over a fiber, or a few watts from a gen6 cell >> node, than to spray tens or hundreds of kilowatts of RF out into the >> universe. > >Heh. The power needed is not that related to being old technology, but >to the frequency used. The lower the frequency, the more power is needed. > >> >> I wonder what fraction of AM transmitter power winds up in receiver >> front-ends. Surely way below 1e-9. Electricity keeps getting more >> expensive so operating an AM station may be bad business. > >AM at MW can work without batteries, with a totally passive receiver and >high impedance headphones. > >... I suspect I can light an LED from local RF fields. Gotta try that some time. Free illumination!