Hello,

I noticed that RX bandwidth is fixed to 100MHz, although the AD9371 datasheet specifies an adjustable range of 8 to 100MHz. Why is this parameter fixed?

double magnesium_radio_control_impl::set_rx_bandwidth(
const double bandwidth, const size_t chan)
{
std::lock_guardstd::recursive_mutex l(_set_lock);
_ad9371->set_bandwidth(bandwidth, chan, RX_DIRECTION);
// FIXME: setting analog bandwidth on AD9371 take no effect.
// Remove this warning when ADI can confirm that it works.
RFNOC_LOG_WARNING("set_rx_bandwidth take no effect on AD9371. "
"Default analog bandwidth is 100MHz");
return AD9371_RX_MAX_BANDWIDTH;
}

Best regards,
Roberto

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This is very interesting. I am trying to set the rx bandwidth on a N321 for a while now.

Is there any workaround? Our bandwidth seems stuck at 8MHz while our application needs much more.

Thanks

Lorenzo

On Feb 25, 2021, at 10:32 AM, Marcus D. Leech via USRP-users usrp-users@lists.ettus.com wrote:


On 02/25/2021 11:30 AM, Puertas Blanco, Roberto via USRP-users wrote:
Hello,

I noticed that RX bandwidth is fixed to 100MHz, although the AD9371 datasheet specifies an adjustable range of 8 to 100MHz. Why is this parameter fixed?

double magnesium_radio_control_impl::set_rx_bandwidth(
const double bandwidth, const size_t chan)
{
std::lock_guardstd::recursive_mutex l(_set_lock);
_ad9371->set_bandwidth(bandwidth, chan, RX_DIRECTION);
// FIXME: setting analog bandwidth on AD9371 take no effect.
// Remove this warning when ADI can confirm that it works.
RFNOC_LOG_WARNING("set_rx_bandwidth take no effect on AD9371. "
"Default analog bandwidth is 100MHz");
return AD9371_RX_MAX_BANDWIDTH;
}

Best regards,
Roberto

Because despite what the datasheet for the AD9371 says, the published interface to change the analog RX bandwidth has no effect.

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