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Michael
Site Admin


Joined: 13 Jan 2005
Posts: 6221
Location: Cary, IL

PostPosted: Tue Jun 14, 2005 8:58 pm    Post subject: EVDO Lies (you know who)

This thread is now locked. A new thread has been started that continues this one, it is at this link:

Robert Kim



Guess what the majority of our private emails are about???

The other EVDO site, that makes all those wild claims, such as:

    3000K EVDO Speed (impossible, 2.4mb is the max, and nobody gets that speed)
    500K 1xRTT Speed (impossible, 144K is the max, most get 50 - 100K)
    Antennas that extend EVDO for 40 miles
    Buy your XV6600 here and get 200% more battery

Does anyone actually believe this stuff?

We explain the benchmark results over here:

http://www.evdoinfo.com/EVDO/Info/EVDO_SuperCharged_5000K_2005022369/

This other site is the main reason why we started OUR EVDO sites, a way to help spread honest and accurate EV-DO information. Hopefully, we have done that.

If you have any comments, experiences with the OTHER site in question, please post them here. Your story may be able to help someone else. If you don't know who were are talking about - consider yourself lucky Smile

For extra credit, guess why the other site, isn't selling Verizon products any more and is just giving out 'quotes'.

Thanks!
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Last edited by Michael on Fri Jul 15, 2005 12:51 pm; edited 1 time in total
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Frank Yu
EVDO Newbie


Joined: 15 Jun 2005
Posts: 1

PostPosted: Wed Jun 15, 2005 9:28 am    Post subject:

Antennas that extend EVDO for 40 miles


IMHO, It's possilbe, if the AP/BTS has enough TX power, at least I heard Nortel guys said they trail network works over that distance.
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Michael
Site Admin


Joined: 13 Jan 2005
Posts: 6221
Location: Cary, IL

PostPosted: Wed Jun 15, 2005 9:34 am    Post subject:

In the urban and metro areas where EVDO is currently being installed, that is not going to be possible. Maybe in the middle of a desert or some other completely flat and empty land that would be possible.

It is kind of like saying that EVDO will get you 2.4mb and 1xRTT will get you 144K. Yes, in a perfect test environment that is possible, but not in the real world.
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brendanhoar
EVDO Heavy User


Joined: 09 Jun 2005
Posts: 140

PostPosted: Wed Jun 15, 2005 2:51 pm    Post subject:

Frank Yu wrote:
Antennas that extend EVDO for 40 miles


IMHO, It's possilbe, if the AP/BTS has enough TX power, at least I heard Nortel guys said they trail network works over that distance.




Might work with the right geography, antenna(s) and perhaps an amp. However, might not be a good idea.

Assuming the collision prevention/detection works similarly to wifi, which may be wrong since those things differ even from TDMA to CDMA, it might not be so nice for the other more local EVDO users on that cell if you use a highly directional yagi at your remote location (to a omni or sectional at the cell site), since other local EVDO users at the cell site might not "hear" your transmits and you might not "hear" theirs, which will slow everyone down since there's more crosstalk.

Point-to-point links (directional antennas on both, or the non-directiona antenna side configured to ignore everyone but the directional connection on purpose) generally work better, but Verizon isn't going to set one up for you at $80/month. Smile

Again, it may be the case that radio-layer of EVDO is less sensitive by design to this kind of crosstalk. I should probably have gone and researched more before opening my big, um, keyboard here. Smile

-brendan
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Zorog
EVDO Heavy User


Joined: 08 Jul 2005
Posts: 135

PostPosted: Fri Jul 08, 2005 11:00 am    Post subject:

Hopefully this will assist with these type of rumors:

Your primary limitation over long distances for EVDO is the uplink. Regardless of the signal strength, the "cell radius" max distance is 25 Kilometers on average - set by the cell site RF design Engineers. In other words, you may be able to boost the signal both ways, but CDMA is designed to ignore any device outside the cell radius parameter. CDMA knows how far from the site you are, and will only reply to devices within the set parameter.

(That's one reason that CDMA works so durn well!) Wink

There is a new "boomer" technology with a greatly enhanced cell radius offered by Nortel that a few rural markets have deployed, but Lucent and Motorola have not yet provided the Carriers the new boomer cells for commercial deployment. It will probably be another year ot two before they make it to the consumer.
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