Article View: alt.cellular.attws
Article #591Re: Consumer Reports: iPhone 4 - Not recommended
From: Jeff Liebermann
Date: Thu, 15 Jul 2010 03:32
Date: Thu, 15 Jul 2010 03:32
33 lines
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3359 bytes
On Wed, 14 Jul 2010 10:53:26 -0700, Peter Lawrence <hummbaby@aol.com> wrote: >On 7/14/10 5:32 AM, SMS wrote: >> >> 3) increasing power helps for transmitting but not receiving. > >But that's were the most help is needed. The biggest problem with today's >tiny cell phones is not that they can receive a signal from a cell. tower >but that they are not able to transmit back a signal that can reach the >cell. tower. Yep. Add to that the problem of intermod, blocking, and interference from handsets using other cell sites, and the performance limitation is at the receiver in the cell site. Performance limitations on the receiver are severe enough that some providers use cryogenically cooled filters and front ends to improve the sensitivity a few dB. Increasing the handset power is not going to do much. Most handsets can only belch perhaps 50 mw of RF. I'm too lazy to check what the iPhone 4 produces, but my guess is that it will be around the same. That's great for long battery life, but a real bummer trying to compensate for cell site receiver issues. Increasing the TX power on the handset to compensate for a 30dB drop in signal is not going to happen. That would require a 1000 times increase in handset TX power. -- # Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060 # 831-336-2558 # http://802.11junk.com jeffl@cruzio.com # http://www.LearnByDestroying.com AE6KS
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