[Discuss-gnuradio] ADC to DDC mux value, measure SNR/SNIR

[Candy Yiu]

Hi,

I am trying to do beamforming using 2 RFX 2400 boards. I am facing an 
issue with setting the mux value (to set ADC connection to DDC and/or 
DUC connection to DAC) on transmitter and receiver side. On the 
transmitter side I am using the value 0xba98 and I think this works. On 
the receiver side I have used values like: 0xf3f2f1f0 (which didn't 
work), 0xf0f0f1f0,  0x00001100 and a few other values (which also didn't 
work). I have used the link the following link in uderstanding how to 
set mux: http://www.nd.edu/~jnl/sdr/docs/tutorials/4.html#tth_sEc2.3 
<http://www.nd.edu/%7Ejnl/sdr/docs/tutorials/4.html#tth_sEc2.3>   Can 
anyone help me understand how to set the mux value and what value 
should I use on transmit and receive side if 2 daughter boards are used 
to form a transceiver?  

(0, 1) or (1,1) value for (side, subdev) is giving an error saying that 
this tuple is out of range. value (0,0) and (1,0) only has to be set on 
both transmit and receive side. My understanding was subdev=0 would 
physically map to one of the antennas on the daughterboard and subdev=1 
maps to the other antenna. My understanding is surely wrong and I am 
missing something, can anyone pls help me understand this? 

Is there anyway to measure the Signal to Noise ratio or SNIR value? 

Really appreciate any help  

Thanks
Meenaktchi