Hi Abbas, Have you tried repeating your experiment in different environments, e.g. outdoors? Transmission ranges in the real world are unpredictable because they are affected by a great many factors, including the layout of buildings and surfaces around you, which can have unpredictable effects. The big jump is probably a random effect of signal bouncing, refractions, fading etc when you had the motes in a particular place.
I have also found that the orientation of the antenna has a big effect with motes, especially the on-board kind which is embedded into the pcb - just a tiny shift can significantly improve or reduce transmission. So I would repeat it in multiple different locations and orientations and take an average. I would expect that to show more consistency. Also have you double checked the power levels against the cc2420 datasheet. Good luck James ________________________________ From: arghav...@cs.otago.ac.nz<mailto:arghav...@cs.otago.ac.nz> Sent: 03/05/2017 21:44 To: tinyos-help@millennium.berkeley.edu<mailto:tinyos-help@millennium.berkeley.edu> Subject: [Tinyos-help] Transmission Range Hello everybody, I measured the transmission range of CC2420 radio chip for a couple of power levels. I have got these measurements: power level 1 ----> 120 cm power level 2 -----> 150 cm power level 3 -----> 3550 cm power level 4 -----> 4050 cm power level 5 -----> 4450 cm power level 6 -----> 5020 cm Does anyone know what is the reason for such a big jump in the transmission range of power level 2 to power level 3. Notice that there is no a big difference between the output power of level 2 and 3. I think is it around -30 dBm for level 2 and -25dBm for level 3. *** I defined the transmission range as the maximum distance between transmitter and receiver so that at least 90% of the packets are delivered. *** All the best, Abbas _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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