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fordrhs41
EVDO User
Joined: 29 Jan 2007
Posts: 92
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 Posted: Wed Jun 18, 2008 7:14 am Post subject: |
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[quote="n6gn"] | littleogre wrote: | | . I've heard you can live up to 30 miles from the tower and still get a strong signal. |
Don't believe everything you hear!
EVDO can give you a strong signal at those kinds of distances (though often usable only to a little less than 20 miles) IF you have LOS.
WiMax has to obey the same laws of physics and endure the same radio path problems as any other protocol.
What is the frequency used by EVDO and WiMax ??
UHF has always been "smoke and mirrors" to me <G>
W5DAZ |
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n6gn
EVDO Junkie
Joined: 22 Aug 2006
Posts: 369
Location: Northern California
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| Posted: Wed Jun 18, 2008 8:07 am Post subject: |
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| fordrhs41 wrote: |
What is the frequency used by EVDO and WiMax ??
UHF has always been "smoke and mirrors" to me <G>
W5DAZ |
Well, strictly speaking, neither protocol implies a frequency, except that they need enough spectrum to operate. In the US, present EVDO operation depends upon where the carrier has spectrum but is either 850 MHz or 1900 MHz (PCS) band.
WiMax has several potential bands earmarked. Worldwide the most common may be 2.5 GHz, where Sprint (now Clearwire) happens to have a lot of spectrum I might add. There are several other likely spots for it though, including 2.1, 3.5 and 5.8 GHz and others in some regions.
UHF-microwave is really fun territory. Once you spend some time at it you realize that it is quite reasonable. It's the trying to compare it with operation <30 MHz that confuses things! Down there, very short antennas are seen to have the capture area the same as a full size dipole (think AM car radio antenna) and signals get guided by the ionospere in strange and unpredictable ways! 
I like playing in all of these regions and it takes that to really make sense out of any of them.
n6gn |
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littleogre
EVDO Fledgling
Joined: 17 Jan 2007
Posts: 13
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| Posted: Fri Jun 20, 2008 9:13 am Post subject: |
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| Ok guys i decided to just take the card back. I'm sure it would work with the proper know how. The problem is i'm not the least bit mechanically inclined. Also the outside antenna would need to be put on a pole with the cable being buried and ran under the house and up through the floor into the modem. Problem with that is i'm scared of tight dark places. Now i'm on a fixed income but would anybody be interested in doing some private contract work. Basically i would need to know how much someone would charge to do all the stuff i just mentioned. |
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littleogre
EVDO Fledgling
Joined: 17 Jan 2007
Posts: 13
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| Posted: Fri Jun 20, 2008 9:16 am Post subject: |
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| when i say wimax covers 30 miles i mean i have heard that you can live 30 miles from the tower and get a full signal with no special equipment. I don't understand that type of stuff but from what i've been told wimax doesn't loose as much strength over distance as evdo does. |
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n6gn
EVDO Junkie
Joined: 22 Aug 2006
Posts: 369
Location: Northern California
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| Posted: Fri Jun 20, 2008 9:54 am Post subject: |
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| littleogre wrote: | | when i say wimax covers 30 miles i mean i have heard that you can live 30 miles from the tower and get a full signal with no special equipment. I don't understand that type of stuff but from what i've been told wimax doesn't loose as much strength over distance as evdo does. |
That's what I was referring to as well. WiMax is just a modulation and protocol standard. It has to live in the physical world with limited power levels, antenna sizes and excess attenuation due to foliage, buildings hills etc. As such, it behaves similarly to Wi*, EVDO, LTE or anything else you care to name. All of these operate reasonably close to the theoretical limit. If they don't have adequate signal, there won't be adequate information transfer.
There *is* a difference among the standards with regard to how *slow* they can go. When signal gets weaker only slower information can be transferred. Thus, some of the standards may fail completely while others just get sluggish. EVDO will actually operate down to 30+ kbps, slower than a dialup connection. WiMax (touted as 75 Mbps) has a lower limit of a bit more than 1 Mbps.
WiMax is going to operate about like EVDO as signal gets weak - as you start trying to use it with similar environment and distance from the cell site.
n6gn |
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