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AD9361 Frequency setting side-effect

Question asked by Mark1 on Jan 29, 2018
Latest reply on Jan 30, 2018 by mhennerich

When setting the Rx center frequency on the device, the hardwaregain seems to also get set simultaneously to the maximum value. The following list of commands demonstrates the issue. 

 


root@xilinx-zc706-2017_2:/sys/bus/iio/devices/iio:device0# cat /sys/bus/iio/devices/iio:device0/in_voltage0_hardwaregain
0.000000 dB


root@xilinx-zc706-2017_2:/sys/bus/iio/devices/iio:device0# echo 1000000000 > /sys/bus/iio/devices/iio:device0/out_altvoltage0_RX_LO_frequency


root@xilinx-zc706-2017_2:/sys/bus/iio/devices/iio:device0# cat /sys/bus/iio/devices/iio:device0/in_voltage0_hardwaregain
73.000000 dB

 

We are trying to avoid this from happening. Does anyone have any thoughts as to why the gain would jump to the max value when changing frequency?

 

Best Regards,

Mark

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