[Tinyos-help] Questions about RSSI value and mica2

[opop 0987]

Hello, i want to ask about RSSI values.
 
My equipments are : mib510, mica2(900MHz)
radio power set to 0xff(max)
 
I rewrite Surge_Reliable and add a ADC 0 count value in the package.
When i only connect the mib510 with a mica2 board(no ohter sensors outside), i often get the battery value about e90000c7(3.14 V) and ADC_0 about  1d01(307).
After calculations, i got the RSSI value -93(dbm). 
The RSSI value are often at -80 ~ -90 dbm.(with sensor nodes exist.)
So is this result correct?
Thanks.
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