Hello
Derel Can you answer one of my previous questions?
Link set_rx_lo_source
Thank you
.
02.03.2018, 17:07, Derek Kozel <derek.ko...@ettus.com>Hello,
You are receiving the maximum possible sample rate. The TwinRX is able to
provide two channels of data compared to the usual 1 per daughterboard
because it uses the 200 MS/s ADC to do real mode sampling on the two
channels. The FPGA then does a conversion to 100 MS/s Complex samples for
each of the two channels since all the rest of the DSP chain is designed for
complex signals. There is no way to bypass this real to complex conversion in
the prebuilt FPGA images.
The TwinRX only supports the use of the 200 MHz master clock rate. The IF
passband filter provides 80 MHz of bandwidth per channel which follows the
general convention of usable bandwidth being 80% of the sample rate when
using complex samples. If the sample rate is reduced below 200 MS/s real (100
MS/s complex) then that IF filtering is insufficient and aliasing will occur.
Additionally the IP for doing the final conversion to baseband is based on
having that full bandwidth available.
Regards,
Derek
On Fri, Mar 2, 2018 at 2:57 PM, Андрей 1 via USRP-users
<usrp-users@lists.ettus.com>
wrote:
I right now started benchmark_rate with sample rate 200 but got 100
MHz(see png).Can I get data without decimation on a clock 200 MHz?
Thank you.
02.03.2018, 16:30, Daniel Jepson <daniel.jep...@ettus.com>Hi,
The X300/X310 supports three Sampling Rates: 120MHz, 184.32MHz, and
200MHz. Your rate was most likely coerced to the most common rate of
200M. The FPGA then performs decimation and interpolation such that
the host doesn't have to stream all that bandwidth (nor can it in
most cases). The streaming rate called out in your screen shots is
10.0Msps.
Does that answer your question?
-Daniel
On Fri, Mar 2, 2018 at 7:57 AM, Андрей 1 via USRP-users
<usrp-users@lists.ettus.com>
wrote:
Hello
When I open device with uhd_usrp_make in the terminal I see a
message "invalid sample rate 100 MHz actual rate is 200 MHz".The
same message I see when running application from uhd samples
folder.If I set sample rate 200 MHz and then read them from
device I got 100 MHz.
What does this mean and what is the maximum clock of the X300 in
single and multichannel mode?
See png for detail.
Thank you
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--
Daniel Jepson
Digital Hardware Engineer
National Instruments
O: +1.512.683.6163
daniel.jep...@ni.com
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