Clearwire - 4G - WiMax
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From: Steve Sobol on 8 Dec 2009 15:36 In article <Xns9CDB77BCFCB52noonehomecom(a)74.209.131.13>, noone(a)home.com says... > > "Ness-Net" <richard.nodamn(a)nessnet.spam.com> wrote in > news:JZCdnXgXqoWqn4PWnZ2dnUVZ_oqdnZ2d(a)giganews.com: > > > You mellowing on us?? > > > > NEVAH!.....(c;] > > I'm watching for the Green Clearwire trucks to come rolling into town! I'm betting Larry's issues are specifically with digital radios, like the ones in modern cell phones. And the problem is not limited to cell phones. Clear Channel, CBS Radio and many smaller players are hyping HDRadio, but, being digital, it too suffers from shorter range. Even the Sirius satellite receiver in my new car has occasional issues. I can count on losing the broadcast when I use the drive-up ATM at the bank near my house. No line-of-sight to the satellite... no signal. (Although I still think satellite radio is cool :>) -- Steve Sobol, Victorville, California, USA sjsobol(a)JustThe.net
From: Dennis Ferguson on 9 Dec 2009 00:39 On 2009-12-08, Steve Sobol <sjsobol(a)JustThe.net> wrote: > In article <Xns9CDB77BCFCB52noonehomecom(a)74.209.131.13>, noone(a)home.com > says... >> >> "Ness-Net" <richard.nodamn(a)nessnet.spam.com> wrote in >> news:JZCdnXgXqoWqn4PWnZ2dnUVZ_oqdnZ2d(a)giganews.com: >> >> > You mellowing on us?? >> > >> >> NEVAH!.....(c;] >> >> I'm watching for the Green Clearwire trucks to come rolling into town! > > I'm betting Larry's issues are specifically with digital radios, like > the ones in modern cell phones. And the problem is not limited to cell > phones. No, Larry's no luddite and I'd bet that he knows that digital radios are quite capable of significantly exceeding the range of NBFM under otherwise identical conditions. The problem is that the conditions aren't identical; if you replace a 3W NBFM handset and car kit with a 200 mW (if you're lucky) digital handset with an internal antenna you will definitely lose something. > Clear Channel, CBS Radio and many smaller players are hyping HDRadio, > but, being digital, it too suffers from shorter range. It isn't that it is digital, it is that the new digital and old analog radio are required to share the same spectrum that the old analog radio used to occupy by itself. If you try to put 20 lbs of potatoes into a 10 lb sack you are going to leave some potatoes on the floor no matter how high tech the sack is. > Even the Sirius satellite receiver in my new car has occasional issues. > I can count on losing the broadcast when I use the drive-up ATM at the > bank near my house. No line-of-sight to the satellite... no signal. > (Although I still think satellite radio is cool :>) Your Sirius receiver is usually receiving its signals from low power radio transmitters which are 22,000 miles away; I'd like to see you do that distance with an analog receiver (you could, but it would require either significantly more power at the satellite or a much uglier receiving antenna on your car). Needless to say, when receiving radio over a 22,000 mile path it is hard to entirely avoid the occasional "issue", though I'd note that I also have "issues" with high power analog FM transmitters which are only 30 miles away when I stop my car in the middle of a multipath fade. Radio is seldom perfectly reliable. Dennis Ferguson
From: Jeff Liebermann on 11 Dec 2009 01:32 On Tue, 08 Dec 2009 23:39:26 -0600, Dennis Ferguson <dcferguson(a)pacbell.net> wrote: >Your Sirius receiver is usually receiving its signals from low power >radio transmitters which are 22,000 miles away; Sirius has a subtantial number of terrestrial repeaters. If you're in a major metro area, you're more likely to hear the repeater than the satellite: <http://www.dogstarradio.com/sirius_map.php> There's also quite a bit of diversity receive technology in the Sirius receivers: <http://en.wikipedia.org/wiki/Sirius_Satellite_Radio#Technology> >I'd like to see you do >that distance with an analog receiver (you could, but it would require >either significantly more power at the satellite or a much uglier >receiving antenna on your car). Given a low enough data rate, you can go much farther. However, you're right about the antenna. The uglier the antenna, the better it works. -- Jeff Liebermann jeffl(a)cruzio.com 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558
From: Larry on 11 Dec 2009 14:38 Jeff Liebermann <jeffl(a)cruzio.com> wrote in news:56p3i5la169hv8id7ju0ljl49g9qgi472h(a)4ax.com: > The uglier the antenna, the better it > works. > Precisely what I've been telling my horrified neighbors for 35 years since I put up the first ham antenna.....(c;] Have some fun with your neighbors. Put up a ham antenna. Even though you don't own a transmitter and never connected it to anything, you are responsible for every electronic failure and every cable outage for a 4 square mile area. I was lucky for years. There was an illegal CBer with a huge tower and stacked ugly beams to blame until 1998 when he died. After that, it was my fault.
From: Jeff Liebermann on 11 Dec 2009 18:45
On Fri, 11 Dec 2009 19:38:04 +0000, Larry <noone(a)home.com> wrote: >Jeff Liebermann <jeffl(a)cruzio.com> wrote in >news:56p3i5la169hv8id7ju0ljl49g9qgi472h(a)4ax.com: > >> The uglier the antenna, the better it >> works. >Precisely what I've been telling my horrified neighbors for 35 years since >I put up the first ham antenna.....(c;] It's true. Every antenna I've designed or cloned is like that. The ones that are near, clean, aesthetic, and elegant looking, don't work. The ones that defy calculations, were thrown together out of scrap, and are very messy, are the ones that work the best. >Have some fun with your neighbors. Put up a ham antenna. Even though you >don't own a transmitter and never connected it to anything, you are >responsible for every electronic failure and every cable outage for a 4 >square mile area. Yep. When I first bought my house in about 1974, I installed a simple 10ft pipe and 3ft marine fiberglass omni antenna on the roof. I was working in marine radio at the time. Almost immediately, well before I dragged home a radio, the TVI complaints arrived. They persisted for perhaps 25 years, until satellite and cable TV arrived to save my sanity. Actually, that didn't quite work. I installed a 19" DBS dish on the roof, which was common enough that it didn't attract any attention. However, when I installed a much larger 1 meter dish, one neighbor decided that I was "irradiating" her and causing all manner of maladies. I now have a large trash bag, with dead oak leaves glued all over it, covering the dish, so hopefully it won't be as noticeable. Incidentally, during the 1970's, there was a nearby cold war era 200mhz long range radar transmitter on Mt Umunhum: <http://www.facebook.com/group.php?gid=7565270773> The radar would get into everything. I heard the buzz on every radio I dragged home, on my hi-fi, TV, test equipment, and even the coils in my toaster oven. Needless to say, there was plenty of RF exposure for everyone. >I was lucky for years. There was an illegal CBer with a huge tower and >stacked ugly beams to blame until 1998 when he died. After that, it was my >fault. Tell the neighbors that the CB'ers transmissions never really die out, and that his signals just bounce between the ground and the ionosphere forever. My might be able to milk a few more years of peace and quite with that ploy. -- # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060 # 831-336-2558 # http://802.11junk.com jeffl(a)cruzio.com # http://www.LearnByDestroying.com AE6KS |