Vikram,
The micaz uses the CC2420 radio (the tmote sky also has the cc2420). In
general, I wouldn't be surprised that different hardware sees different
transmission ranges, even for identical radio hardware. There are
probably a dozen different reasons why the devices have different
transmission ranges. After looking at the datasheets for both, the most
apparent difference is the inclusion of an internal antenna for the
tmote sky versus an external antenna in the micaz. There are other
reasons that even the same hardware but different transmission radii,
for example if the impedance matching network is not created correctly,
then there will be a large VSWR (Voltage standing wave ratio).
Basically, a large portion of the transmitted signal is reflected as it
propagates from the radio to the antenna, reducing the signal strength.
It may very well be the case that the antenna radiation patterns are
also very different. Even changing the orientation of the identical
devices can result in drastically different results for the same
hardware. So it's hard to say for certain what the actual cause is.
-Paul
On 12/30/2009 5:37 AM, Vikram vik76 wrote:
Hello,
I would like to know what is the radio that is used by the MICAz motes?
Is it CC2420 or MPR2400 ? and what are the differences between them?
I want to set the transmission power to a very low value.
I used CC2420_DEF_RFPOWER for values 1 and 2. I was surprised to see
that for the value of 1 the transmission range is about 7-10 cms.
Whereas for the tmote sky for the value of 1, it is about 20-30 cms.
Thanks
Vikram
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