Markie
join:2003-07-26
Kalispell, MT
| reply to adisor19
Re: I don't understand
Sadly you're wrong too... 10MHz of spectrum is 10Mhz (as an example) whether 450-460 or 850-860 or 1900-1910 or 5900-5910 (just as examples, those aren't exact real assignments).
There IS more available at higher frequencies as lower frequencies have already been called for, though Feb 17th a ton of 700MHz spectrum is being freed up, most of it going to Verizon and AT&T (yay for the big getting bigger  )
The basic idea of a shorter wavelength being blocked more easily IS correct though. |
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adisor19
join:2004-10-11
 ·Velcom
·TekSavvy Solutions..
·Radioactif
 ·Videotron
·Look Communications
| reply to jaminus
said by jaminus  :Signals on the 850mhz band tend to work better for mobile users than signals on the 1900mhz band. While the output power for EDGE signals is the same on both bands, 1900mhz is a shorter wavelength and so the signal doesn't travel long distances from cell towers. But on the flipside, 1900mhz signals penetrates buildings more easily than 850mhz signals, so mobile users in dense buildings with lots of metallic structural elements might actually notice better coverage thanks to the shift of EDGE from 850mhz to 1900mhz. Wrong. WRONG. WRONG !!!.
850Mhz penetrates bulidings easyer because over the same distances, the vibration is more then redused by half. As a result, it has half the chance of being absorbed by a foreign object.
The downside is that it carries half the data that 1900Mhz would due to being only half the vibrations over the same distance.
Also, i'm using very simplistic words to describe this...
Adi |
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hottboiinnc
ME
join:2003-10-15
Cleveland, OH | reply to patcat88
I'm a TM user and my cell phone just fine in buildings. |
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SterlingJ85
Obama 2008
join:2000-11-19
Millville, NJ
 ·PHONE POWER
| reply to jaminus
Hang on.. Let me clarify this statement...
1900 MHz frequencies penetrate buildings better than 800 MHz signals do AT HIGH POWER LEVELS.
For example, a Sprint tower NEXT to a highrise will have better penetration into the building than an 800 MHz frequency would if the tower were farther away.
However, in the real world, this situation isn't always the case and 800 MHz carriers will typically dominate.
Conversely, 1900 MHz (aka. PCS) networks typically have more cell sites (dense tower spacing) in a given area than 800 MHz (aka. cellular) networks, which could make this situation more likely in certain areas. |
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patcat88
join:2002-04-05
Jamaica, NY
| reply to jaminus
said by jaminus :But on the flipside, 1900mhz signals penetrates buildings more easily than 850mhz signals, so mobile users in dense buildings with lots of metallic structural elements might actually notice better coverage thanks to the shift of EDGE from 850mhz to 1900mhz. Wrong. Try talking to a Sprint or Tmobile user and you will hear about how they enter buildings and goto 1 bar or loose service, meanwhile their Verizon and ATT friends are fine.
When 1900 gets degraded, either through air, or brick, or wood, it degrades faster/more for the same obsticle than 850.
Same reason as 802.11A vs 802.11G.
Now you can thearetically crank up the transmit power on 1900 to be much higher than 850 to give the same reception as 850, but the cellphones can't scream back loud enough to the tower, or the 1900 signal will collide with another 1900 signal on the same channel, and nobody will have service where the 2 arcs intersect. Increasing the TX power also creates a larger marginal service area as the circle of coverage of that tower expands. |
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jaminus
join:2004-10-14
Arlington, VA
| reply to beaups
Signals on the 850mhz band tend to work better for mobile users than signals on the 1900mhz band. While the output power for EDGE signals is the same on both bands, 1900mhz is a shorter wavelength and so the signal doesn't travel long distances from cell towers.
But on the flipside, 1900mhz signals penetrates buildings more easily than 850mhz signals, so mobile users in dense buildings with lots of metallic structural elements might actually notice better coverage thanks to the shift of EDGE from 850mhz to 1900mhz. |
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