Get RSSI with USRP1 and RFX2400

hi all,

I want to use the read_aux_adc method to get the RSSI,After reading
the code, I think the argument 1,0 should be right.
But the result is strange. when there is no sender , the value
returned is always 12. While there is a sender and the distance
between sender and receiver is less than 1m, the value returned is
between 0~24 (maybe less than 12), no matter what the tx-amplitude of
sender is. Does the result make sense?
I am not sure whether the result is right,especially for those less
than 12. Thanks.

P.S.
the result with a sender:
4 24 8 20 24 16 20 20 20 8 8 20 16 20 20 16 4 12 24 0 20 24 8 20 0 8
12 16 0 16 4;

the result without a sender:
12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12 12
12 12 12


Su Jinzhao