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From: John Larkin <jjSNIPlarkin@highNONOlandtechnology.com>
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
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On Sat, 4 May 2024 12:29:24 +0200, "Carlos E.R."
<robin_listas@es.invalid> wrote:

>On 2024-05-03 17:43, John Larkin wrote:
>> On Thu, 02 May 2024 05:24:08 GMT, Jan Panteltje <alien@comet.invalid>
>> 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!