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

From: Candy Yiu
Subject: [Discuss-gnuradio] ADC to DDC mux value, measure SNR/SNIR
Date: Thu, 29 Mar 2007 13:10:58 -0700
User-agent: Thunderbird (Windows/20070221)


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

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