Marcin, we are using the B210 in an application that requires a high degree of coherency between the two Rx inputs. We rarely change the data capture from 20MSPS, unlike your case, but I have completed analysis of 260 1-Gb data files and have not seen anything like what I saw in your videos. When looking at the videos, my first instinct was that you were picking up WiFi or Bluetooth interference on one channel. Perhaps you are well past such considerations, but I thought I'd give my 30-second impression. -page heller
On 8/3/2021 1:20:57 PM, [email protected] <[email protected]> wrote: Hello, Thank You for the interest in my problem. Yes I am feeding the signal into both RX2 ports. I have just repeated the same thing symmetrically for TX/RX ports and the distortion was present again. Kind regard, Marcin Wachowiak -----Wiadomość oryginalna----- Od: [email protected] Wysłano: Tuesday, 3 August 2021 19:48 Do: [email protected] Temat: USRP-users Digest, Vol 132, Issue 8 Send USRP-users mailing list submissions to [email protected] To subscribe or unsubscribe via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of USRP-users digest..." Today's Topics: 1. Re: Optical SFP+ adapters for N321 (Vladica Sark) 2. Re: One RX channel of B210 presents distorted signal from splitter (Marcus D. Leech) ---------------------------------------------------------------------- Message: 1 Date: Tue, 3 Aug 2021 17:39:36 +0200 From: Vladica Sark Subject: [USRP-users] Re: Optical SFP+ adapters for N321 To: Michael Dickens Cc: "[email protected]" Message-ID: Content-Type: text/plain; charset=utf-8; format=flowed Hi Michael, Thanks for informing us about this. I would be happy to test it. I am in the moment on vacation, but next week I will find some time to test it. Best regards, Vladica On 03.08.21 17:17, Michael Dickens wrote: > Hi Vladica & the USRP community - For those of you who have White > Rabbit equipment, you can download brand new hot off the buildbots WR > FPGA images (WX and XQ) for your N3x0 or N32x here < > https://drive.google.com/drive/folders/1y-AJA2ZBaHgwyRCiOfatfAyLSX0t1G > 7l?usp=sharing > > G7l?usp=sharing>> . Note that these are for UHD 4.1.0.X -- UHD public > GIT master; GIT branch UHD-4.1, or 4.1.0.0 or 4.1.0.1 releases. I've > tested these FPGA images on N310 revision 5 and 7, and N320 (current > revision); just up through "benchmark_rate" when specifying > "time_source=sfp0" and multiple channels, both on the USRP and remote > to a host ... all works fine! Thus, I wanted to get the FPGA images > out to customers for testing / evaluation ... If you do so, I'd love > to hear of your successes / issues! - MLD > > > On Tue, Jul 13, 2021 at 2:01 PM Vladica Sark > > wrote: > > Hi Rob, > > Thanks for this useful information. > According to Michael it should be fixed mid/late July 2021, so pretty > soon. Meanwhile I can only switch back to X310 probably, and see > if it > works there. > > Let's hope it would be fixed soon. > > > BR, > Vladica > > > On 12.07.21 17:47, Rob Kossler wrote: > > Hi Vladica, > > From the 'changelog', it appears that N321 support began with > release > > 3.14. But, at that point I believe that WR was already broken. > So, I > > think that there is no solution to your problem other than to > wait for > > Ettus to fix the WR issues. However, WR has been broken for a > while > > (note user-list posts from last fall Sept & Dec) so I don't > know when > > this will be working again. > > Rob > > > > > > On Wed, Jul 7, 2021 at 10:26 AM Vladica Sark > > > >> > wrote: > > > > Hi Michael, > > > > I obtained the necessary SFP+ optical adapters and now I am > trying to > > put uhd 3.13.1.0 on the N321s in order to use the WR > synchronization. > > Unfortunately, when I update the sd card image with 3.13.1.0 > the N321 > > boots but the SFP0 and SFP1 do not go up. When I try to run > > uhd_find_devices, on a terminal using the USB port it says > no UHD > > devices are found. > > > > I believe that the right FPGA image should be put on the > FPGA, but > > the > > ways described in Knowledgebase are not working. > > > > Is there a way to put the version 3.13.1.0 on the N321? I > have tried > > version 4.0.0.0 and it is working fine, but WR is broken. > > > > BR, > > Vladica > > > > > > On 22.06.21 21:31, Michael Dickens wrote: > > > I'm using primarily FS adapters, cables (single and multi > mode), > > and > > > fiber connectors (to allow multiplexing lanes). The adapters I > > bought > > > were "generic" and had to be tweaked using an FS BOX to be > fully > > > compatible with Intel or Mellanox NICs. This tweaking > seems to have > > > helped a lot with the 100 Gb interface (E810); the 10 Gb > > interfaces do > > > not show much benefit to be manufacturer specific -- > though I'm > > sure > > > it doesn't hurt! I have not tried a multi-mode to single mode > > splitter > > > / joiner, but I'd suppose they do exist & if anybody here > has had > > > experience that would be useful to hear about! I hope this is > > useful! > > > - MLD > > > > > > > > > On Tue, Jun 22, 2021 at 10:05 AM Vladica Sark > > > > > > > > > >>> > > wrote: > > > > > > Hi Michael, > > > > > > Thanks for the answer. For now for the data I am using DAC > > cables, > > > but > > > we would need larger distances, i.e. 50+ meters, and for > > this I would > > > need fibers for both WR and data. > > > > > > Is there also some optical multiplexer for these > wavelengths, in > > > order > > > to use a simplex fiber, for both WR and data? > > > > > > BR, > > > Vladica > > > > > > On 22.06.21 15:41, Michael Dickens wrote: > > > > Hi Vladica - I've tested a variety of fiber adapters and > > cables > > > with > > > > no issues (e.g., ZyXEL, FS, Axcen). The primary keys are > > to make > > > sure > > > > the various related parameters match up between the > > adapters and > > > > cables and devices. For example: If the adapter is > 1490/1310, > > > then you > > > > want to make sure the cable is for the same > wavelengths. Same > > > for the > > > > fiber polish and other parameters (single / dual > fiber ; . > > Some are > > > > easier than others, none of this is too difficult > luckily! > > > > > > > > For short distances, a DAC cable will work for all > of the > > N320/N321 > > > > SFP interfaces. > > > > > > > > At the moment, WR support is being fixed for UHD > 3.14.0.0 to > > > current. > > > > If you -require- WR support -right now- you can use UHD > > 3.13.1.0 > > > while > > > > we're working out how to fix WR for newer UHD. We expect > > the fix > > > to be > > > > available to customers sometime in mid/late-July > (2021); once > > > the fix > > > > is determined and verified we will commit it to the > various > > > branches > > > > of the UHD repository, and it will be available in UHD > > -after- the > > > > forthcoming 4.1 release. It will be available in the > > public UHD > > > > repository for folks to use to patch UHD between > releases. > > > > > > > > I hope this is useful! - MLD > > > > > > > > > > > > On Tue, Jun 22, 2021 at 6:19 AM Vladica Sark > > > > > > > > >> > > > > > > > > > > > > >>>> > > > wrote: > > > > > > > > Dear all, > > > > > > > > I would like to use N321 with WRS 3/18 which > uses optical > > > cables. I > > > > would like to use also for the 10 Gbit SFP1 > optical SFP+ > > > transceiver. > > > > Do you have some recommended optical SFP+ adapters, > > duplex and, > > > > preferably, simplex? > > > > The idea is to use a duplex monomode fiber, one > fiber for > > > the 10 Gbit > > > > data and one fiber for WRS synchronization. > > > > They would be connected to 10 Gbit switch or QNAP > > > Thunderbolt to SFP+ > > > > adapter, so they do not have to be Intel. > > > > > > > > > > > > Best regards, > > > > > > > > Vladica > > > > > > > > _______________________________________________ > > > > USRP-users mailing list -- > [email protected] > > > > > > > > > > > >> > > > > > > > > > > > > > > > > >>> > > > > To unsubscribe send an email to > > > [email protected] > > > > > > > > > > > > >> > > > > > > > > > > > > > > > > >>> > > > > > > > > > _______________________________________________ > > USRP-users mailing list -- [email protected] > > > > > > > To unsubscribe send an email to > [email protected] > > > > > > > > ------------------------------ Message: 2 Date: Tue, 03 Aug 2021 13:48:17 -0400 From: "Marcus D. Leech" Subject: [USRP-users] Re: One RX channel of B210 presents distorted signal from splitter To: [email protected] Message-ID: <[email protected]> Content-Type: multipart/alternative; boundary="------------040402040901010904020401" On 08/03/2021 11:08 AM, Marcin Wachowiak wrote: > Hello, > The signals provided at the input have quite low power, far below the > threshold of -20dbm. ( I don't know the exact values but I > additionally even added a 30dB attenuator for safety) What I also > found out is that the distortions are dependent more on the setting of > the RX, TX gain than the value. During live testing I observed the > this harmonic distortion at one channel only, and after increasing the > TX or RX gain it disappeared (what is visible in the new videos): > usrp_b210_strange_harmonic_distoriton.mp4 > > w?usp=drive_web> > usrp_b210_strange_harmonic_distoriton_2.mp4 > > w?usp=drive_web> > Kind regards, > Marcin Wachowiak Right because distortion in RF components isn't going to start occurring at a uniform level over each discrete device--there will be variability. Are you using the same (RX2) antenna inputs in each case? At high gain levels it doesn't take much to drive things into non-linear operation. > > On Mon, 2 Aug 2021 at 18:57, > > wrote: > > Send USRP-users mailing list submissions to > [email protected] > > To subscribe or unsubscribe via email, send a message with subject or > body 'help' to > [email protected] > > > You can reach the person managing the list at > [email protected] > > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of USRP-users digest..." > > Today's Topics: > > 1. Older B100 and associated Daughter cards. (Guy Mengel) > 2. Re: Older B100 and associated Daughter cards. (Richard Stanley) > 3. One RX channel of B210 presents distorted signal from splitter > (Marcin Wachowiak) > 4. Re: One RX channel of B210 presents distorted signal from > splitter > (Marcus D. Leech) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 02 Aug 2021 09:47:18 -0400 > From: Guy Mengel > > Subject: [USRP-users] Older B100 and associated Daughter cards. > To: [email protected] > Message-ID: <[email protected] > > > Content-Type: text/plain; markup=markdown > > Hi All, > I am finally going to get started using an older B100 USRP with > the LFTX, LFRX, WBX daughter boards. I purchased these from a > well known amateur radio op in January of this year. I had played > with it for a short time on Ubuntu 18.04 with the older > unsupported Python2 interface, this was a start. Then the Covid > Pandemic hit. > Well, I am now back. > Are there any users in the group using the B100 USRP with the > LFTX, LFRX, WBX daughter boards using a newer Ubuntu 20.04 with > updated Python 3.X with GNURADIO? I wanted to see if there were > any still using this older SDR. My plans are to experiment with > it and create a rig to be used at HF and possibly UHF to microwave > down the road. > > I would also like to have pointers too! > > Thanks! > Guy Mengel N1GMM > > > ------------------------------ > > Message: 2 > Date: Mon, 2 Aug 2021 10:37:14 -0400 > From: Richard Stanley > > > Subject: [USRP-users] Re: Older B100 and associated Daughter cards. > To: Guy Mengel > > Cc: [email protected] > Message-ID: <[email protected] > > > Content-Type: text/plain; charset=us-ascii > > (Resent to include mailing list) > > Hi Guy, > > I've recently used B100s with the LFRX, BasicRX, and (EOL) TVRX2 > with the latest UHD and GNU Radio 3.8 on Ubuntu 20.04. > > A challenge for me with the LFRX/TX and BasicRX/TX was finding the > correct sub-device specification as they can acquire/transmit an > IQ pair or real-valued signals. In addition, I required a Hilbert > transform to convert real-valued samples in baseband to complex > for some processing in GNU Radio for Rx. There are a lot of > questions about these daughtercards in the mailing list archive > and often the questions seem to be about sub-device specification > and real-valued versus IQ. > > Enjoy the B100! > > HTH, > Richard > > On Aug 2, 2021, at 09:47, Guy Mengel > > wrote: > > Hi All, > I am finally going to get started using an older B100 USRP with > the LFTX, LFRX, WBX daughter boards. I purchased these from a > well known amateur radio op in January of this year. I had played > with it for a short time on Ubuntu 18.04 with the older > unsupported Python2 interface, this was a start. Then the Covid > Pandemic hit. > Well, I am now back. > Are there any users in the group using the B100 USRP with the > LFTX, LFRX, WBX daughter boards using a newer Ubuntu 20.04 with > updated Python 3.X with GNURADIO? I wanted to see if there were > any still using this older SDR. My plans are to experiment with > it and create a rig to be used at HF and possibly UHF to microwave > down the road. > > I would also like to have pointers too! > > Thanks! > Guy Mengel N1GMM > > _______________________________________________ > USRP-users mailing list -- [email protected] > > To unsubscribe send an email to [email protected] > > > ------------------------------ > > Message: 3 > Date: Mon, 2 Aug 2021 18:37:08 +0200 > From: Marcin Wachowiak > > > Subject: [USRP-users] One RX channel of B210 presents distorted signal > from splitter > To: [email protected] > Message-ID: > > > > Content-Type: multipart/alternative; > boundary="000000000000d8512b05c8962e2b" > > Hello, > I am working on a phase coherent application using USRP B210. As > the phase > difference between RX channels of B210 is relatively stable I > wanted to see > how it behaves across the whole frequency range. I performed some > measurements and unfortunately for some frequencies I observed strange > distortions. The setup consists of a TX USRP, RF splitter, matched > cables > and a second USRP with both RX channels connected to the splitter. > Screams documenting the distortions: > https://drive.google.com/drive/folders/1DkjrVKz3ywv3ZE0eS1UYeCMTtQwL3Du8?usp=sharing > The received sine wave should have quite similar shape and spectral > properties across both RX channels of USRP. > What I observe instead is a symmetrical harmonic tone at one of > the RX, > when the other does not record it. > There are also random distortions in one of the RX channels > looking as if > the sine signal was split and shifted at some point in time (looks > like a > some sort of buffer issue) > This kind of distortion for some settings persists for some is not > present > or occurs regularly. > To provide some illustiation I attach recordings and screens of the > registered distortions. > usrpb210_sine_rx_distoriton2.mp4 > > usrpb210_sine_rx_distoriton.mp4 > > > I tried to debug this problem but it appears to be related to > sample rate, > TX tone frequency, carrier frequency and gains. (I checked dynamic IQ > imbalance or gain controls and changing of the parameters did not > affect > anything) > There are now underflow/overflow flags present while I run the > flowchart. > The signal that is provided to both RX is identical ( RF > mini-circuits RF > splitter), and any outside interferences are limited as the whole > setup is > connected via concentric cables. I tried to set the number of > receive and > sent frames to 1024 to ensure continuity, but that didn't help. > It is strange that for some frequencies this phenomenon occurs > while for > others the phase difference variance is very low and there are no such > distortions. > Could You please explain the cause or propose some kind of > solution to this > issue? > > Kind regards, > Marcin Wachowiak > -------------- next part -------------- > A message part incompatible with plain text digests has been > removed ... > Name: not available > Type: text/html > Size: 4104 bytes > Desc: not available > > ------------------------------ > > Message: 4 > Date: Mon, 02 Aug 2021 12:39:31 -0400 > From: "Marcus D. Leech" > > > Subject: [USRP-users] Re: One RX channel of B210 presents distorted > signal from splitter > To: [email protected] > Message-ID: <[email protected] > > > Content-Type: multipart/alternative; > boundary="------------050204020106080302070102" > > On 08/02/2021 12:37 PM, Marcin Wachowiak wrote: > > Hello, > > I am working on a phase coherent application using USRP B210. As > the > > phase difference between RX channels of B210 is relatively stable I > > wanted to see how it behaves across the whole frequency range. I > > performed some measurements and unfortunately for some > frequencies I > > observed strange distortions. The setup consists of a TX USRP, RF > > splitter, matched cables and a second USRP with both RX channels > > connected to the splitter. > > Screams documenting the distortions: > > > https://drive.google.com/drive/folders/1DkjrVKz3ywv3ZE0eS1UYeCMTtQwL3Du8?usp=sharing > > The received sine wave should have quite similar shape and spectral > > properties across both RX channels of USRP. > > What I observe instead is a symmetrical harmonic tone at one of the > > RX, when the other does not record it. > > There are also random distortions in one of the RX channels > looking as > > if the sine signal was split and shifted at some point in time > (looks > > like a some sort of buffer issue) > > This kind of distortion for some settings persists for some is not > > present or occurs regularly. > > To provide some illustiation I attach recordings and screens of the > > registered distortions. > > usrpb210_sine_rx_distoriton2.mp4 > > > > > usrpb210_sine_rx_distoriton.mp4 > > > > > > > I tried to debug this problem but it appears to be related to > sample > > rate, TX tone frequency, carrier frequency and gains. (I checked > > dynamic IQ imbalance or gain controls and changing of the > parameters > > did not affect anything) > > There are now underflow/overflow flags present while I run the > > flowchart. The signal that is provided to both RX is identical ( RF > > mini-circuits RF splitter), and any outside interferences are > limited > > as the whole setup is connected via concentric cables. I tried > to set > > the number of receive and sent frames to 1024 to ensure continuity, > > but that didn't help. > > It is strange that for some frequencies this phenomenon occurs > while > > for others the phase difference variance is very low and there > are no > > such distortions. > > Could You please explain the cause or propose some kind of > solution to > > this issue? > > > > Kind regards, > > Marcin Wachowiak > > > > > > _______________________________________________ > > USRP-users mailing list -- [email protected] > > > To unsubscribe send an email to [email protected] > > What are your signal levels going into the RX USRP? > > They need to be well below -20dBm or so to protect against > non-linearity, and even then, that's awfully loud. > > > > > -------------- next part -------------- > A message part incompatible with plain text digests has been > removed ... > Name: not available > Type: text/html > Size: 6081 bytes > Desc: not available > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > USRP-users mailing list -- [email protected] > > To unsubscribe send an email to [email protected] > > > > ------------------------------ > > End of USRP-users Digest, Vol 132, Issue 2 > ****************************************** > > > > _______________________________________________ > USRP-users mailing list -- [email protected] > To unsubscribe send an email to [email protected] -------------- next part -------------- A message part incompatible with plain text digests has been removed ... Name: not available Type: text/html Size: 24310 bytes Desc: not available ------------------------------ Subject: Digest Footer _______________________________________________ USRP-users mailing list -- [email protected] To unsubscribe send an email to [email protected] ------------------------------ End of USRP-users Digest, Vol 132, Issue 8 ****************************************** _______________________________________________ USRP-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
_______________________________________________ USRP-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
