Hi all, a lot going on here, but let me just confirm a few things:
- The _200 suffix is derived from the max analog bandwidth you get, but like Chris says there is no analog filtering on the X440, so really it's a maximum sampling rate (of 250Msps). With the _200 image, you get access to resamplers, and thus also to lower sampling rates (and therefore analog bandwidths, but you still need to filter outside of the X440). - The _400 and _1600 images have no resamplers, but they have some flexibility in the available sampling rates. - 10 Msps is about the limit you can achieve on the device itself. --M On Fri, Feb 7, 2025 at 5:32 PM Chris Rogers <c1337rog...@gmail.com> wrote: > I’d suggest taking a look at this section of the manual > https://files.ettus.com/manual/page_usrp_x4xx.html#x440_usage_mcrs and > the link Marcus sent > https://kb.ettus.com/About_Sampling_Rates_and_Master_Clock_Rates_for_the_USRP_X440. > This is a unique USRP architecture that requires some frequency and clock > planning > > You should probably manually set your desired Master Clock Rate (MCR) and > Converter Rate (Fc) based on your frequencies of interest. It’s important > to note that the X440 has no analog front end, so you cannot adjust any > analog bandwidth filters, but you can reduce the MCR and Fc which will > reduce the bandwidth digitally, and DDC will further reduce the bandwidth. > You can set these clocks in the device arguments. So basically, if you set > rx_rate=100e6, you’ll be getting 100 MHz of bandwidth, but where in the > spectrum that 100 MHz is located and how many aliases you’ll see is decided > by how you configure the clocks and what you set the RF center frequency to. > > Your timeout error is probably caused by running UHD programs on the X440 > itself. It’s really designed to stream samples to it from a different host > computer over the QSFP ports > > On Fri, Feb 7, 2025 at 8:44 AM Rilbert Lima via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> Thank you, Chris. >> >> I have updated the FPGA image from the USRP X440 to the X4_200, and upon >> executing, the sampling rate has been reduced to approximately 5 Msps. >> >> Another matter I would like to inquire about is whether it is possible to >> reduce the analog bandwidth of the signal from 200 MHz to 100 MHz. I am >> aiming to use the X440 with OpenAirInterface5G in FR1, but since the image >> is from the X4_200, which is tied to a 200 MHz bandwidth, I would like to >> know if there is any workaround to perform this downgrade." >> >> However, in some tests that were performed, the receive timeout error >> appears, even using the 5e6 sampling rate, increasing the value to 99 *Num >> timeouts (Rx): 99*. And I don't know why these receive errors appeared. >> >> >> root@ni-x4xx-342597F:/usr/lib/uhd/examples# ./benchmark_rate --rx_rate >> 5e6 --tx_rate 5e6 >> >> [INFO] [UHD] linux; GNU C++ version 11.4.0; Boost_107800; >> UHD_4.7.0.0-0-ga5ed1872 >> >> [00:00:00.029460] Creating the usrp device with: ... >> >> [INFO] [MPMD] Initializing 1 device(s) in parallel with args: >> mgmt_addr=127.0.0.1,type=x4xx,product=x440,serial=342597F,name=ni-x4xx-342597F,fpga=X4_200,claimed=False >> >> [WARNING] [MPM.RPCServer] A timeout event occured! >> >> [INFO] [MPM.PeriphManager] init() called with device args >> `fpga=X4_200,mgmt_addr=127.0.0.1,name=ni-x4xx-342597F,product=x440,clock_source=internal,time_source=internal,initializing=True'. >> >> Using Device: Single USRP: >> >> Device: X400-Series Device >> >> Mboard 0: x440 >> >> RX Channel: 0 >> >> RX DSP: 0 >> >> RX Dboard: A >> >> RX Subdev: 0 >> >> RX Channel: 1 >> >> RX DSP: 1 >> >> RX Dboard: A >> >> RX Subdev: 1 >> >> RX Channel: 2 >> >> RX DSP: 2 >> >> RX Dboard: A >> >> RX Subdev: 2 >> >> RX Channel: 3 >> >> RX DSP: 3 >> >> RX Dboard: A >> >> RX Subdev: 3 >> >> RX Channel: 4 >> >> RX DSP: 4 >> >> RX Dboard: B >> >> RX Subdev: 0 >> >> RX Channel: 5 >> >> RX DSP: 5 >> >> RX Dboard: B >> >> RX Subdev: 1 >> >> RX Channel: 6 >> >> RX DSP: 6 >> >> RX Dboard: B >> >> RX Subdev: 2 >> >> RX Channel: 7 >> >> RX DSP: 7 >> >> RX Dboard: B >> >> RX Subdev: 3 >> >> TX Channel: 0 >> >> TX DSP: 0 >> >> TX Dboard: A >> >> TX Subdev: 0 >> >> TX Channel: 1 >> >> TX DSP: 1 >> >> TX Dboard: A >> >> TX Subdev: 1 >> >> TX Channel: 2 >> >> TX DSP: 2 >> >> TX Dboard: A >> >> TX Subdev: 2 >> >> TX Channel: 3 >> >> TX DSP: 3 >> >> TX Dboard: A >> >> TX Subdev: 3 >> >> TX Channel: 4 >> >> TX DSP: 4 >> >> TX Dboard: B >> >> TX Subdev: 0 >> >> TX Channel: 5 >> >> TX DSP: 5 >> >> TX Dboard: B >> >> TX Subdev: 1 >> >> TX Channel: 6 >> >> TX DSP: 6 >> >> TX Dboard: B >> >> TX Subdev: 2 >> >> TX Channel: 7 >> >> TX DSP: 7 >> >> TX Dboard: B >> >> TX Subdev: 3 >> >> [00:00:04.112276974] Setting device timestamp to 0... >> >> [WARNING] [0/DDC#0] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [0/DDC#0] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DDC#0] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [0/DDC#0] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DDC#0] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [0/DDC#0] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DDC#0] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [0/DDC#0] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DDC#1] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [0/DDC#1] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DDC#1] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [0/DDC#1] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DDC#1] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [0/DDC#1] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DDC#1] The requested decimation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even decimation to ensure that a halfband filter is enabled. >> >> Decimations factorable by 4 will enable 2 halfbands, those factorable by >> 8 will enable 3 halfbands. >> >> decimation = dsp_rate/samp_rate -> 49 >> >> [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [00:00:04.465504150] Testing receive rate 5.015510 Msps on 1 channels >> >> [WARNING] [0/DUC#0] The requested interpolation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even interpolation to ensure that a halfband filter is enabled. >> >> [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DUC#0] The requested interpolation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even interpolation to ensure that a halfband filter is enabled. >> >> [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DUC#0] The requested interpolation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even interpolation to ensure that a halfband filter is enabled. >> >> [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DUC#0] The requested interpolation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even interpolation to ensure that a halfband filter is enabled. >> >> [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DUC#1] The requested interpolation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even interpolation to ensure that a halfband filter is enabled. >> >> [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DUC#1] The requested interpolation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even interpolation to ensure that a halfband filter is enabled. >> >> [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DUC#1] The requested interpolation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even interpolation to ensure that a halfband filter is enabled. >> >> [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> [WARNING] [0/DUC#1] The requested interpolation is odd; the user should >> expect passband CIC rolloff. >> >> Select an even interpolation to ensure that a halfband filter is enabled. >> >> [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is >> 5.016 MHz >> >> Setting TX spp to 352 >> >> [00:00:04.801908845] Testing transmit rate 5.015510 Msps on 1 channels >> >> [00:00:14.826000429] Benchmark complete. >> >> Benchmark rate summary: >> >> Num received samples: 50161056 >> >> Num dropped samples: 0 >> >> Num overruns detected: 0 >> >> Num transmitted samples: 50201888 >> >> Num sequence errors (Tx): 0 >> >> Num sequence errors (Rx): 0 >> >> Num underruns detected: 0 >> >> Num late commands: 0 >> >> Num timeouts (Tx): 0 >> >> Num timeouts (Rx): 0 >> >> Done! >> _______________________________________________ >> USRP-users mailing list -- usrp-users@lists.ettus.com >> To unsubscribe send an email to usrp-users-le...@lists.ettus.com >> > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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