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From: "Carlos E.R." <robin_listas@es.invalid>
Newsgroups: sci.electronics.design
Subject: Re: AM radio law opposed by tech and auto industries is close to
 passing
Date: Sat, 4 May 2024 12:29:24 +0200
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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.

....

-- 
Cheers, Carlos.