Just an idea: maybe the third mote has some low-power radio 
implementation (low-power listening, LPL) enabled and the sending motes 
somehow do not take this into account (i.e., they do not send a 
long-enough preamble).

Cheers,
Urs


On 10/29/10 3:28 PM, Simon Eberz wrote:
> According to the TinyOS wiki the CC2420 radio stack, which is used by
> the MICAz motes, performs a CCA by default, this should not be the problem.
> Furthermore, not a single one out of the ~300 packets was received by
> the third mote, but all were received by the second one. I don't think
> the problem is interference or something similiar.
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