You can of course add antennas of various kinds. The mica2's have
the advantage of being in the RFID freq range so there are some
standard things available. I found some in the digikey catalog.
MS
Jacob Sorber 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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>
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