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] <[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 <[email protected]> Subject: [USRP-users] Re: Optical SFP+ adapters for N321 To: Michael Dickens <[email protected]> Cc: "[email protected]" <[email protected]> Message-ID: <[email protected]> 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 > <https://drive.google.com/drive/folders/1y-AJA2ZBaHgwyRCiOfatfAyLSX0t1 > 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 <[email protected] > <mailto:[email protected]>> 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 > <[email protected] <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>> > 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 > > <[email protected] <mailto:[email protected]> > <mailto:[email protected] <mailto:[email protected]>> > > > <mailto:[email protected] > <mailto:[email protected]> <mailto:[email protected] > <mailto:[email protected]>>>> > > 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 > > > <[email protected] <mailto:[email protected]> > <mailto:[email protected] <mailto:[email protected]>> > > <mailto:[email protected] <mailto:[email protected]> > <mailto:[email protected] <mailto:[email protected]>>> > > > > <mailto:[email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>> <mailto:[email protected] > <mailto:[email protected]> > > <mailto:[email protected] <mailto:[email protected]>>>>> > > > 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] <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>> > > > <mailto:[email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>>> > > > > <mailto:[email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>> > > > <mailto:[email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>>>> > > > > To unsubscribe send an email to > > > [email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>> > > > <mailto:[email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>>> > > > > <mailto:[email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>> > > > <mailto:[email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>>>> > > > > > > > > > _______________________________________________ > > USRP-users mailing list -- [email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>> > > To unsubscribe send an email to > [email protected] > <mailto:[email protected]> > > <mailto:[email protected] > <mailto:[email protected]>> > > > ------------------------------ Message: 2 Date: Tue, 03 Aug 2021 13:48:17 -0400 From: "Marcus D. Leech" <[email protected]> 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 > <https://drive.google.com/file/d/1hYHfI_oXke5K9PGTz-R88n-DNfaiJUYP/vie > w?usp=drive_web> > usrp_b210_strange_harmonic_distoriton_2.mp4 > <https://drive.google.com/file/d/15bq0hmUJFLWskA8qb7w_7-EXPF3oGv7Y/vie > 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, <[email protected] > <mailto:[email protected]>> wrote: > > Send USRP-users mailing list submissions to > [email protected] <mailto:[email protected]> > > To subscribe or unsubscribe via email, send a message with subject or > body 'help' to > [email protected] > <mailto:[email protected]> > > You can reach the person managing the list at > [email protected] > <mailto:[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 <[email protected] <mailto:[email protected]>> > Subject: [USRP-users] Older B100 and associated Daughter cards. > To: [email protected] <mailto:[email protected]> > Message-ID: <[email protected] > <mailto:[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 <[email protected] > <mailto:[email protected]>> > Subject: [USRP-users] Re: Older B100 and associated Daughter cards. > To: Guy Mengel <[email protected] <mailto:[email protected]>> > Cc: [email protected] <mailto:[email protected]> > Message-ID: <[email protected] > <mailto:[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 <[email protected] > <mailto:[email protected]>> 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] > <mailto:[email protected]> > To unsubscribe send an email to [email protected] > <mailto:[email protected]> > > ------------------------------ > > Message: 3 > Date: Mon, 2 Aug 2021 18:37:08 +0200 > From: Marcin Wachowiak <[email protected] > <mailto:[email protected]>> > Subject: [USRP-users] One RX channel of B210 presents distorted signal > from splitter > To: [email protected] <mailto:[email protected]> > Message-ID: > > <caofh71xdrz7a+xu89t-6gewy4aa_hmnfb+-0aege6y-f4zv...@mail.gmail.com > <mailto:caofh71xdrz7a%2bxu89t-6gewy4aa_hmnfb%[email protected]>> > 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 > > <https://drive.google.com/file/d/1Hif0dZY2Ah7ipC13nfudhoK5HD0JeM9M/view?usp=drive_web> > usrpb210_sine_rx_distoriton.mp4 > > <https://drive.google.com/file/d/13niyBdl6H4w0Akdf28KeontnZKUsCUaW/view?usp=drive_web> > > 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" <[email protected] > <mailto:[email protected]>> > Subject: [USRP-users] Re: One RX channel of B210 presents distorted > signal from splitter > To: [email protected] <mailto:[email protected]> > Message-ID: <[email protected] > <mailto:[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 > > > > <https://drive.google.com/file/d/1Hif0dZY2Ah7ipC13nfudhoK5HD0JeM9M/view?usp=drive_web> > > usrpb210_sine_rx_distoriton.mp4 > > > > <https://drive.google.com/file/d/13niyBdl6H4w0Akdf28KeontnZKUsCUaW/view?usp=drive_web> > > > > 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] > <mailto:[email protected]> > > To unsubscribe send an email to [email protected] > <mailto:[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] > <mailto:[email protected]> > To unsubscribe send an email to [email protected] > <mailto:[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 ... 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