Yep, I understand... Good luck! Sergio
On Tue, Feb 21, 2012 at 9:20 PM, Xiaohui Liu <[email protected]> wrote: > Hi, > > Thanks for your data. > > I'm just wondering if there is any one else having similar result with > yours before I accept it as my ground truth. 4-5 dB's difference is too > large for my purpose. > > Or has anyone got a measurement conforming to the datasheet? > > On Tue, Feb 21, 2012 at 12:20 PM, Sergio Valcarcel > <[email protected]>wrote: > >> Hi >> >> We sold a sma connector to the iMote2 board which was connected directly >> to the spectrum analyzer, through a good and short cable (I assume < 1dB >> att @ 2.4GHz). >> >> I did not use a vector network analyzer to check the impedance... so the >> only thing I guess now is that we had to move one smd capacitor, which is >> pretty small, so perhaps it was a bit burned after sold again. Hence the >> output impedance could be a bit non-matched. >> >> I would not be surprised if the iMote is not giving 0 dBm, but some dB >> less... >> >> >> >> On Tue, Feb 21, 2012 at 4:45 PM, Xiaohui Liu <[email protected]> wrote: >> >>> Hi, >>> >>> This is what the datasheet says: >>> power vs dBm >>> 3 -25 >>> 7 -15 >>> 11 -10 >>> 15 -7 >>> 19 -5 >>> 24 -3 >>> 27 -1 >>> 31 0 >>> >>> Somehow your measurement of those power levels is 4-5 dBm lower than >>> what is shown above. >>> >>> Are you using an attenuator over the antenna or measuring the power some >>> distance away? I'm not familiar with spectrum analyzer, so I'm just giving >>> some naive guess here. >>> >>> >>> On Tue, Feb 21, 2012 at 7:52 AM, Sergio Valcarcel >>> <[email protected]>wrote: >>> >>>> Hi, >>>> >>>> this is what I measured one and a half year ago using an iMote2 and a >>>> spectrum analyzer, I actually demodulated the signal so you can be sure >>>> that the values are quite accurate. >>>> However the weird thing is that the mote did not rise to 0dBm, but only >>>> to -4dBm. Sorry, I did not remember whether each column belongs to a >>>> different mote. Also, note that setting the value to 0 it gives the maximum >>>> power, but 1 stands for the least output power. >>>> >>>> 0 -4.1 >>>> 1 -51 >>>> 2 -46 >>>> 3 -29 -28.9 4 -22 -22.8 5 -22 -22.7 6 -22 -22.5 7 -19 -19.4 8 >>>> -16.5 -16.6 9 -16.5 -16.5 10 -16.5 -16.42 11 -15.5 -14.6 12 -13.8 >>>> -12.7 13 -13.7 -12.7 14 -13.7 -12.6 15 -12.4 -11.4 16 -11.1 -10 17 >>>> -10 -10 18 -10 -10 19 -9 -9 20 -8 -8 21 -8 -8 22 -8 -8 23 -7.2 >>>> -7.2 24 -6.5 -6.3 25 -6.5 -6.3 26 -6.3 -6.3 27 -5.7 -5.6 28 -5 >>>> -4.9 29 -5 -4.9 30 -5 -4.9 31 -4.4 -4.3 >>>> I hope this helps! >>>> Cheers! >>>> Sergio >>>> >>>> On Tue, Feb 21, 2012 at 6:10 AM, Xiaohui Liu <[email protected]> wrote: >>>> >>>>> Hi everyone, >>>>> >>>>> Does anyone know what the output powers are at each power level from 0 >>>>> to 31 for CC2420? >>>>> The CC2420 datasheet only gives the output power for level 3, 7, 11, >>>>> 15, 19, 23, 27 and 31. However, the output power for other levels like 2 >>>>> or >>>>> 12 are missing. I find some threads such as >>>>> 1<http://comments.gmane.org/gmane.os.tinyos.users/18536.>, >>>>> 2<http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2009-March/039014.html> >>>>> and >>>>> 3<http://mail.millennium.berkeley.edu/pipermail/tinyos-help/2007-August/027345.html>, >>>>> asking similar question, but no definitive answers based on measurements >>>>> have been given. Please advise. Your help is truly appreciated. >>>>> >>>>> -- >>>>> -Xiaohui Liu >>>>> >>>>> _______________________________________________ >>>>> Tinyos-help mailing list >>>>> [email protected] >>>>> >>>>> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >>>>> >>>> >>>> >>> >>> >>> -- >>> -Xiaohui Liu >>> >> >> > > > -- > -Xiaohui Liu >
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