Hello, I am also interested if anyone has done work with this. I am using Mica2 Motes.
I can say that I get 1'-3' without antennas, but that it is a fairly directional signal, I suspect due to the shape of the antenna plug. The stock antennas are quarter-wave. I have some experience with radio, enough to know antenna/wavelength sizes and that half and full wave would provide more range, but I am not sure of the signal mathmatics for the scale up/down. Nor am I sure how behavior would be with very short antennas for testing purposes. I expect that it would be necessary to shield the motes to prevent leakage and give a true omnidirectional range for short distance testing. The only paper I have run accross so far describing signals was inconclusive, and full of problems with environmental reflection. Thanks, Ben -- For some reason, the United States is the only country on Earth where accidents don't happen it's always somebody's fault, and you can sue that somebody for neglect. On Mon, October 16, 2006 3:40 am, Sumit Gupta said: > Hi, > > I want to reduce the signal distance of each mote to 4-6 feet maximum, to > create a small testable network bed. I am not able to do so. I have already > reduce the signal strength to minimum by changing the value of > CC2420_DEF_RFPOWER to 0x01 from 0x16 (which is default) but its still more > than 20 to 30 feet. I know this distance depends up on surrounding noise too > but is there any way to reduce the signal distance between nodes so that I > can create a mini network bed. I am using telosb. > > Thanks in advance, > > Regards, > Sumit Gupta > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
