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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 12:26:15 +0200
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On 2024-05-03 00:32, Joe Gwinn wrote:
> On Thu, 2 May 2024 08:28:35 +0200, "Carlos E.R."
> <robin_listas@es.invalid> wrote:
> 
>> On 2024-05-02 07:24, 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 ;-) ?
>>>
>>
>> You are talking of the USA?
>>
>> I would think that there are areas over there where FM in cars does not
>> work, and people have to use AM.
>>
>> It happens in Spain, which is far smaller, so surely it happens in the USA.
> 
> It does happen in the US, particularly in rural areas and/or
> mountainous areas, because the short-wave stuff (FM band and above,
> including TV bands) is line of sight, while AM follows the ground over
> the mountain into the valley, and so on.  This effect is quite strong,
> and many rural communities in valleys paid to have a repeater atop the
> highest local mountain, to send the FM and TV signals down into the
> valley.  Which doesn't work so well from a car driving through the
> mountains.
> 
> I had a friend many years ago who lived in rural Virginia, and had the
> valley problem, and some makes and models of car didn't have good
> enough AM radios, and/or had too much interference from the ignition
> system.

I wonder if modern ignition is better than old for this. I mean, now 
there is a coil per plug, so that the distribution works at low voltage.

-- 
Cheers, Carlos.