On 11/02/2018 05:15 AM, Julian Ilinca via USRP-users wrote:
Hello all,
I'm new to the USRP world and still getting to know all the
functionalities of the USRP
device I'm using, so please bare with me. I'm using 2 N210.s equipped
with the WBX dboards.
My application requires for me to measure the waveform of an arbitrary
signal between 100MHz and 400 MHz. By looking at the block diagram, I
have gathered that the received signal is mixed to some intermediate
frequency before the the AD-conversion is performed at 100Msps. My
first question is how can I figure out what this IF-frequency is?
Second, I want to have as few samples as possible while still avoiding
aliasing of the
received signal. Thus, I am wondering if the sample rate I'm setting
(through set_rx_rate()) refers to the sample rate at which the
IF-signal is sampled. Or is this sampling frequency
some virtual sampling that defines to what IF the the signal will be
mixed to?
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Your application receives a complex baseband signal. The WBX card is
also a complex-baseband card that is band-limited to 40MHz of
bandwidth, so that the 100Msps sampling of the ADC is free of aliases.
The sample-rate as seen by the application is after the FPGA DDC code
has filtered and re-sampled the signal to the desired rate.
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