In my cursory experience, the 'Zs seem to be more reliable
but also more environment sensitive. The higher the freq the
more line-o-sight it becomes. And 2.4G is an absorption band
for water...on the other hand there are more cheap antenna
options because it matches up with WiFi.
MS
Tony Han wrote:
Thank you all,
I think the transmission distance is also deeply effected by the
environment. I use the same mica2 433MHz at the other places, I got
about 60m, and for 900MHz mica2, I got 25m, but when I put everything to
that site, the distance reduced to 30 m and 10 m respectively. I think
that is because the grass, the tree and river absorb the signal and made
it harder to listen to each other. I never use micaz before, is 2.4GHz
has less inference from the environment? I think I definitely need use
a high gain antenna, but should I move to 2.4G micaz or stay with mica2?
Thank you again, and I will let you know the testing results.
Tony
On 9/25/07, *José Manuel Sánchez-Matamoros Pérez*
<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> wrote:
I have used mica2 motes at 900MHz and i get more than 20 meters with
a mote on the ground. On this experiment we don't configure the mote
at the max power, so i think we can obtain a greater distance easily.
Another think you must to check is the battery level.
On 9/25/07, *Jacob Sorber* < [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Radio range will depend on how close to the ground you are. The
range you are describing for your mica2's seems about right for
a mote on the ground. If you can put them on a pole or in a
tree, you will improve your range considerably.
You might also want to look at the XE1205 radio on the tinynode
(from shockfish). At 30kbps we've been able to get 500m+ near
the ground and near water with the whip antennae they come
with. They claim that you can get 1km+ with a data rate of
1.2kbps, but tinyos doesn't currently support any data rate
under 30kbps.
Jacob
On 9/25/07, * Demin Wang* < [EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
We used 2.4GHz 8.5 dBi antennas on MicaZs and can reach
maximum 400
meters with the maximum transmission power.
demin
On 9/25/07, Tony Han <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
> Hi folks,
>
> I try to use mica2 sending data for 100m in certain area
(have a few trees
> and a creek around), but now, with 900MHz mica2, I get
only 10 m in that
> environment, and if I use 433MHz mica2, I got 30m, still
far less than 100m.
> I use TinyOS 1.1.15. I set the transmission power to the
maximum value in
> MakeXbowlocal file.
>
> My question: is there any other "mote" has a longer range?
or is there any
> antenna can improve the TX and RX distance?
>
> I saw people deal with reduce the range for micaz, but
please someone help
> in increase the range.
>
> Thank you in advance
>
> Tony
>
>
>
>
>
>
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