Path: ...!Xl.tags.giganews.com!local-3.nntp.ord.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mail NNTP-Posting-Date: Fri, 31 Jan 2025 01:42:59 +0000 Subject: Re: News : ARM Trying to Buy AmperComputing Newsgroups: comp.os.linux.misc References: <_hycnQxlN5kAphr6nZ2dnZfqn_SdnZ2d@earthlink.com> <1Wadnbe7od-Cagj6nZ2dnZfqnPqdnZ2d@earthlink.com> <8RucnQnhsYgzjgr6nZ2dnZfqn_idnZ2d@earthlink.com> <9ducnXj9pdrfuwr6nZ2dnZfqn_SdnZ2d@earthlink.com> From: "WokieSux282@ud0s4.net" Organization: WokieSux Date: Thu, 30 Jan 2025 20:43:00 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Message-ID: Lines: 78 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 99.101.150.97 X-Trace: sv3-wb4k7sb7XBEbMCgwyjPIensVWGy6bn8KVGaG8388qrEZ5msiJ4BzSsQFOtESSoVHZ/9pCysSX9BAQRy!W21G5PVGflFXw8QBQIbLzifREOQUehpudkqWTtxjk1MJYuUw0awFimFDKYD2Z/5CrTB+Mu0vDZDl!OBfsDs/WThSK+MOD/Wtj X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 5050 On 1/30/25 4:19 PM, The Natural Philosopher wrote: > On 30/01/2025 20:13, Charlie Gibbs wrote: >> On 2025-01-30, The Natural Philosopher 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. The USA has a number of what they call "clear channels" on the AM band. Those stations install extremely powerful transmitters and become "regional radio". It is difficult to find a place where you can't at least receive some of those. https://en.wikipedia.org/wiki/Clear-channel_station Depending on exact atmospherics, you can often pick up clear channels from up to 1000 miles away at night. Few USA AM radio receivers have a 'sensitivity' or 'bandwidth' adjustment. Those can be useful in rejecting strong close stations. You find them on 'desk-set' multiband radios, but not on consumer stuff. Sometimes that noisy mix of channels can be INTERESTING however ... drive half a mile or go around the bend and you drift from one station to another to another :-) When US automotive radios still had 'dials' there were two little 'triangle' symbols imprinted there. These were (are) the "when the bomb falls" emergency channels. A couple of megawatt+ stations are supposed to come on Just In Case. Hmmm - just for fun - there's been discussion of the upper+lower sideband width in AM radio. Now, what kind of music could be composed that would be adaptable to VLF/ULF/ELF frequencies ? With maybe 200 Hz or far less to play with ... :-)