On 03/10/2018 08:41 PM, Sailor Jerry via USRP-users wrote:
I'm using the rx_samples_to_file to capture the data.
I have pure noise connected to input. If I plot first few milliseconds
of IQ data I see some pull-in process. Interestingly enough this
pull-in time doesn't depend on parameter "--setup".
Is it some fancy IQ calibration?
When does the samples capture start?
Should I ignore first samples?
Thanks a lot.
You're capturing an analog process, so there's no way to definitively
say sample <X> is your first valid sample.
It takes a few msec for the DC-offset and I/Q compensator on the AD9361
to reach some kind of equillibrium when the RX logic is turned on. It takes
a while for analog filters and other analog "bits and pieces" to
reach steady-state operations.
It takes a while for whatever DDC filters are in play to reach
steady-state operations. So, a few milliseconds on RX startup is
actually pretty good in
my book...
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