That ref you give looks like a pretty good analysis. Although
I can't attest to the accuracy of any of it, it's got lots of
cool equations. I assume you are referring to the graph on pg 17,
where the no-problem-with-rain statement is made...That particular
page is a really fabulous example of what
In theory Rain doesn't affect on Path Loss at 2.4GHz, for example
(http://www.radionet.com/_FileRoot/318040.pdf)
But I have measured great drop in RSSI during the rain, I guess it's due to
antenna effects.
Regards, Sadkov Aleksandr.
>
> A few rules of thumb...
> The lower the frequency, th
A few rules of thumb...
The lower the frequency, the more likely the signal will "curve"
or diffract around obstacles.
The bigger and more conductive the obstruction, the more it will absorb.
Microwaves at 2.4 GHz are used to heat food because water absorbs
at that frequency, th
On 2/20/07, Philip Levis <[EMAIL PROTECTED]> wrote:
On Feb 20, 2007, at 10:42 AM, Jacob Sorber wrote:
> You are asking for a simple answer where none exists. Wireless
> channels are tricky. While line-of-sight is straightforward, "not
> in line of sight" could mean a lot of things. What is ob
On Feb 20, 2007, at 10:42 AM, Jacob Sorber wrote:
You are asking for a simple answer where none exists. Wireless
channels are tricky. While line-of-sight is straightforward, "not
in line of sight" could mean a lot of things. What is obstructing
the signal? A building? A person? A hill
You are asking for a simple answer where none exists. Wireless channels are
tricky. While line-of-sight is straightforward, "not in line of sight"
could mean a lot of things. What is obstructing the signal? A building? A
person? A hill of dirt and rock? Is it raining? What is the humidity?
hi,
what is the range when not in line of sight, i thought that the communication
in 2.5Ghz frequency range is not affected by line of sight
thank you
manu
Joe Polastre <[EMAIL PROTECTED]> wrote: As per the datasheet, 1 meter elevated
above the ground, line of sight.
For on the ground results,
As per the datasheet, 1 meter elevated above the ground, line of sight.
For on the ground results, see:
http://www.polastre.com/papers/spots05-telos.pdf
-Joe
On 2/6/07, Xavier Orduña <[EMAIL PROTECTED]> wrote:
Hi,
I'm using the tmote sky to deploy a wsn in an outdoor environment. After
firsts
Well,
This in fact is the normal behavior of such radio. But i think that you
can try to ask directly to the tmote sky producers what were the
conditions to get up to 125 meters.
In order for you to increase the connectivity range you can try to lift
a bit both nodes, even only 0.5 meters can i
Hi,
I'm using the tmote sky to deploy a wsn in an outdoor environment. After
firsts tests, I discovered that when motes are on the floor (without any
tripod or similar) the maximum range (using max tx power) is no higher
than 7 or 8 meters. That's very far from the 125 meter range that is
des
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