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 Frankis chillingPremium
join:2000-11-03
somewhere | reply to patcat88
Re: iPhone and HSPA+ said by patcat88:CDMA is available everywhere except Europe and Australia (CDMA was shut down there), except about 1/2 the countries with CDMA are on 450mhz (ex-nordic analog bagphone band, zero chance of 450mhz iPhone), I always wondered about that, why isnt 450mhz used here in the states? I'm not familiar with radio transmission or frequencies but I was under the impression that the lower the frequency the better the transmission into buildings and the less towers you need to put up?
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At first I thought everyone on the highway was drunk but then I realized I was driving in Florida  | |
| I think it's cause it's still used for the C-band satellite broadcast (the BUDS, Big Ugly Dishes).. Someone correct me if i'm wrong.
Adi | |
patcat88
join:2002-04-05
Jamaica, NY
kudos:1
2 edits | reply to Frank
said by Frank:I always wondered about that, why isnt 450mhz used here in the states? I'm not familiar with radio transmission or frequencies but I was under the impression that the lower the frequency the better the transmission into buildings and the less towers you need to put up? Because in the USA, the FCC for decades handed out 2 way walkie talkie radio channels to anything with a Inc on the end of it, and the warehousers will let go of it on a cold day in hell, and the rest is given to amateur radio.
»www.cdg.org/technology/3g/cdma45···tion.asp
»www.ntia.doc.gov/osmhome/allochrt.pdf
Plus the Ham radio lobby will fight to the end for their bands, and the so will all the businesses that don't use their endless bands.
»Re: Legislation Introduced in US Senate to Inventory Radio Spect
Some folks in congress are trying to force the FCC to do a spectrum inventory study, something that has never been done before in the USA, so congress can TRY (tough luck with lobbyist $) and revoke/evict all the warehousers and other poor excuses for radio channels and use them for something that actually helps citizens.
It would be really sweet if 450mhz band was opened up in USA, mountain coverage, deep inside concrete building coverage (Wal-mart/Home Depot/office tower), underground passages (subway/underground city/mall-ish), and areas where there are no towers because the NIMBYs are the zoning board, and all the carriers have a huge gap in the area. Of course a phone should use 450mhz as a last resort as to not congest it.
Edit: made a little chart to show the NMT CDMA bands visually, its basically 450-460 mhz for mobile tx, and 465-475 for tower tx, plus 2 more distant bands. Each license seems to be 5 mhz. A tiny tiny tiny amount nowadays. 1.25 mhz CDMA will fit, UTMS with its 5mhz blocks probably wouldn't. The 2 800mhz bands in the USA are 30 mhz I believe. PCS bands are 10, 20 or 30, although some have been subdivided to 5mhz I think. | |
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