Dear András Bíró, Currently I've not started the test, nowadays I'm trying to collect information about this issue. But after finish the test I'll share the results.
Yours faithfully, Alejandro. > Hi Alejandro, > > 868MHz was better, because the water in the grain absorbs the 2.4GHz > electromagnetic waves. And I think the soil contains more water. > Could you please inform me about the results of your experiments? I'm > intrested in using these radios in bad environment. > > Thanks, > Andris > > On Fri, Oct 5, 2012 at 7:19 PM, <[email protected]> wrote: >> Dear András Bíró. >> >> I think probably with 868 MHz was better than 2.4 GHz because the >> wavelength is the longest. I was expecting to reach at least 25 m. >> >> Thanks a lot for your information. >> >> Yours faithfully, >> >> Alejandro. >> >>> Hi Alejandro, >>> >>> I would except much less. We tried to communicate in grain (corn to be >>> exact), and it was less than 1m. Eventually, we used 868MHz, which was >>> still really bad, but we could live with that. >>> But anyway, you should try it, it's quite simple. >>> One more thing: in our tests, it seemed that it was much better if the >>> mote was in a bigger box, so its antenna gets farther from the grain >>> (but we couldn't use this solution). >>> >>> Andris >>> >>> >>> On Fri, Oct 5, 2012 at 6:53 PM, <[email protected]> wrote: >>>> Dear Hamid Rafiei. >>>> >>>> Thanks for your answer. >>>> >>>> What do you think is the maximum distance in the best case? e.g. in >>>> 50 >>>> m. >>>> >>>> Sincerely, >>>> >>>> Alejandro >>>> >>>> >>>>> Hi, >>>>> >>>>> I believe it all depends on the level of moisture in the soil, in >>>>> case >>>>> of >>>>> a >>>>> high level of humidity it wouldn't be much at all >>>>> >>>>> On Friday, October 5, 2012, wrote: >>>>> >>>>>> Dear all, >>>>>> >>>>>> Someone know how much is the maximum distance to communicate two >>>>>> TelosB >>>>>> under the soil using antenna of 5 dBi each one and 2.4 GHz? I mean >>>>>> the >>>>>> two >>>>>> sensors are "buried" even the antennas as well. >>>>>> >>>>>> Thanks in advance for any information. >>>>>> >>>>>> Regards, >>>>>> >>>>>> Alejandro. >>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Tinyos-help mailing list >>>>>> [email protected] <javascript:;> >>>>>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>>>>> >>>>> >>>>> >>>>> -- >>>>> -- Sent from my iPhone >>>>> >>>> >>>> >>>> _______________________________________________ >>>> Tinyos-help mailing list >>>> [email protected] >>>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>> >> >> > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
