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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: News : ARM Trying to Buy AmperComputing
Date: Thu, 30 Jan 2025 21:19:33 +0000
Organization: A little, after lunch
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On 30/01/2025 20:13, Charlie Gibbs wrote:
> On 2025-01-30, The Natural Philosopher <tnp@invalid.invalid> wrote:
> 
>> AM is of such crap quality it is unlistenable. 30-3kHz bandwidth
> 
> Isn't it 5 kHz?  I can't see wasting quality on a 2-kHz guard band.
> 
Channel spacing is 9kHz. So since its double sideband you have to be WAY 
down at 4Khz.
By really careful tweaking I managed to get a radio design to 3.5Khz

Total waste of time really - here in Europe there is too much RF clutter 
in the MW & LW bands


> I've heard about AM stereo.  Is that for real?  If so, how?
> 
No idea. Never heard off it. You cant make a silk purse...

>> and 40dB signal to noise? You have top be freakin' kidding me!
>> FM is way better,
> 
> As long as there isn't a hill between you and the transmitter.
> And in a car you have constantly-shifting multipath interference.

You get that on MW far far more.

I've not had issues with FM reception - it either works pretty well or 
it just stops working till the next transmitter is in reasonable line of 
sight.

UK has pretty good FM coverage overall - its a small place - and with 
RDS the tuner skips to the best transmitter and frequency  for the 
station you are tuned to. If its local, tough.

> All in all, though, I consider FM a win - but it's nice to have
> the AM option.
> 
FM here has less stations but in practice a pretty good signal - the 
channel spacing in the UK is 200kHz so there's plenty of room, but in 
Germany they run 100kHz. The filters you need to reject a strong station 
100KHz away do unpleasant things to the stereo at high audio frequencies.

Germans have cloth ears anyway.


-- 
Ideas are more powerful than guns. We would not let our enemies have 
guns, why should we let them have ideas?

Josef Stalin