On 07/16/2018 02:46 PM, Veytser, Leonid - 0665 - MITLL via USRP-users wrote:
I am unable to set either RX or TX bandwidth on N310. When attempting
to set, I get the following warning:
Setting TX Bandwidth: 40.000000 MHz...
*[WARNING] [0/Radio_0] *set_tx_bandwidth take no effect on AD9371.
Default analog bandwidth is 100MHz
Actual TX Bandwidth: 0.000000 MHz...
and
Setting RX Bandwidth: 40.000000 MHz...
*[WARNING] [0/Radio_0] *set_rx_bandwidth take no effect on AD9371.
Default analog bandwidth is 100MHz
Actual RX Bandwidth: 100.000000 MHz...
When looking through the UHD code, I tracked down to these FIXME comments:
https://github.com/EttusResearch/uhd/blob/master/host/lib/usrp/dboard/magnesium/magnesium_radio_ctrl_impl.cpp#L322
Is this some sort of limitation with the N310 and the AD9371
tranceiver? Does this mean I am unable to set TX and RX bandwidth at all?
Thanks,
Lenny
Based purely on the comment, I'm guessing that there are notionally
registers to control this in the AD9371, but they don't apparently
work as documented, hence the warning message.
Keep in mind that *internally*, the AD9371 samples the analog mixer
outputs at several hundred MHz, so if the internal anti-alias filters
are set-up for 100MHz by default, there's no danger of aliases
appearing in the outputs, regardless of your ultimate sample-rate delivered
to the host.
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