Re: News : ARM Trying to Buy AmperComputing

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