Hello Guys.
My friends, where can i found informations/docs about Image Reject Mixer (IRM) using SDR? Thank you! *Bruno * *E**E**ngineer * *@eengbruno* *+*55 21 981 246 269 2018-02-12 15:00 GMT-02:00 <discuss-gnuradio-requ...@gnu.org>: > Send Discuss-gnuradio mailing list submissions to > discuss-gnuradio@gnu.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > or, via email, send a message with subject or body 'help' to > discuss-gnuradio-requ...@gnu.org > > You can reach the person managing the list at > discuss-gnuradio-ow...@gnu.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Discuss-gnuradio digest..." > > > Today's Topics: > > 1. Customized Block Giving Incorrect Output (Tellrell White) > 2. Re: Customized Block Giving Incorrect Output (Michael Dickens) > 3. Re: Customized Block Giving Incorrect Output (Tellrell White) > 4. Re: Customized Block Giving Incorrect Output (Michael Dickens) > 5. Re: Customized Block Giving Incorrect Output (M?ller) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 11 Feb 2018 21:00:03 -0500 > From: Tellrell White <rell...@gmail.com> > To: Discuss-gnuradio@gnu.org > Subject: [Discuss-gnuradio] Customized Block Giving Incorrect Output > Message-ID: > <CA+NbTCbGD+jHchri24HNn+BeYq9kH-UmczbueO0jtiMicHkt_w@ > mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hello Guys > I've created a customized block that takes in a number of input items and > once that number of input items surpasses a certain number, 1024 of the > input items are taken and stored into a list, and then those items are > converted to dB and lastly compared to a threshold value. If any of the > values are greater than the threshold value, a message is printed > indicating a signal is present, and if none of the values are greater than > the threshold, this is indicated with a message stating "No signal is > present". I've tested the block in both simulation and currently, I'm > testing the block over the air using the N210. The block performed > correctly in simulation, however, over the air, the block gives a response > of "no signal present" regardless of the input. The error message " > > python: Fatal IO error 11 (Resource temporarily unavailable) on X server > :0.0 > > also printed during runtime. Any suggestions are welcome. Both the > simulation flow graph and the flow graph used over the air are attached. > > Tellrell White > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/ > attachments/20180211/e7705d31/attachment.html> > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: ener_dtec_sim1.grc > Type: application/octet-stream > Size: 19781 bytes > Desc: not available > URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/ > attachments/20180211/e7705d31/attachment.obj> > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: energy_detector.grc > Type: application/octet-stream > Size: 40914 bytes > Desc: not available > URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/ > attachments/20180211/e7705d31/attachment-0001.obj> > > ------------------------------ > > Message: 2 > Date: Mon, 12 Feb 2018 09:42:02 -0500 > From: Michael Dickens <michael.dick...@ettus.com> > To: Tellrell White <rell...@gmail.com>, GNURadio Discussion List > <discuss-gnuradio@gnu.org> > Subject: Re: [Discuss-gnuradio] Customized Block Giving Incorrect > Output > Message-ID: > <1518446522.348348.1267994296.5b506...@webmail.messagingengine.com > > > Content-Type: text/plain; charset="utf-8" > > Hi Tellrell - So I'm not sure about the non-sim error / issue, but to me > the larger question is: what are you really trying to do? If you're > trying to detect energy via converting an FFT vector output to dB and > thresholding, on a specific number of items per FFT, then why not just > use vectors throughout to guarantee the # of items is as desired? The > FFT block is, of course, vectorized; so is the "complex to ||^2" block > (or, rather it can be; you're not currently using it in this manner). > Then, you set the energy detector to take in 1 vector of length N (same- > same as the FFT and ||^2) & you're good to go. Maybe I'm missing > something? Hope this is useful. - MLD > On Sun, Feb 11, 2018, at 9:00 PM, Tellrell White wrote: > > I've created a customized block that takes in a number of input items > > and once that number of input items surpasses a certain number, 1024 > > of the input items are taken and stored into a list, and then those > > items are converted to dB and lastly compared to a threshold value. If > > any of the values are greater than the threshold value, a message is > > printed indicating a signal is present, and if none of the values are > > greater than the threshold, this is indicated with a message stating > > "No signal is present". I've tested the block in both simulation and > > currently, I'm testing the block over the air using the N210. The > > block performed correctly in simulation, however, over the air, the > > block gives a response of "no signal present" regardless of the input. > > The error message " python: Fatal IO error 11 (Resource temporarily > > unavailable) on X server :0.0> also printed during runtime. Any > suggestions are welcome. Both the > > simulation flow graph and the flow graph used over the air are > > attached. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/ > attachments/20180212/1c4fabc7/attachment.html> > > ------------------------------ > > Message: 3 > Date: Mon, 12 Feb 2018 10:17:23 -0500 > From: Tellrell White <rell...@gmail.com> > To: Michael Dickens <michael.dick...@ettus.com>, > Discuss-gnuradio@gnu.org > Subject: Re: [Discuss-gnuradio] Customized Block Giving Incorrect > Output > Message-ID: > <CA+NbTCaJTnJcWDGxD=9vs3ipju6xOuwMPGWEr4yKTT5XPWFgxg@mail. > gmail.com> > Content-Type: text/plain; charset="utf-8" > > Michael > Thanks for the response. That's exactly what I'm trying to accomplish. You > mention the "complex to ||^2 can be vectorized. My question is how exactly > do you go about doing that? > > Tellrell > > On Mon, Feb 12, 2018 at 9:42 AM, Michael Dickens < > michael.dick...@ettus.com> > wrote: > > > Hi Tellrell - So I'm not sure about the non-sim error / issue, but to me > > the larger question is: what are you really trying to do? If you're > trying > > to detect energy via converting an FFT vector output to dB and > > thresholding, on a specific number of items per FFT, then why not just > use > > vectors throughout to guarantee the # of items is as desired? The FFT > block > > is, of course, vectorized; so is the "complex to ||^2" block (or, rather > it > > can be; you're not currently using it in this manner). Then, you set the > > energy detector to take in 1 vector of length N (same-same as the FFT and > > ||^2) & you're good to go. Maybe I'm missing something? Hope this is > > useful. - MLD > > > > On Sun, Feb 11, 2018, at 9:00 PM, Tellrell White wrote: > > > > I've created a customized block that takes in a number of input items and > > once that number of input items surpasses a certain number, 1024 of the > > input items are taken and stored into a list, and then those items are > > converted to dB and lastly compared to a threshold value. If any of the > > values are greater than the threshold value, a message is printed > > indicating a signal is present, and if none of the values are greater > than > > the threshold, this is indicated with a message stating "No signal is > > present". I've tested the block in both simulation and currently, I'm > > testing the block over the air using the N210. The block performed > > correctly in simulation, however, over the air, the block gives a > response > > of "no signal present" regardless of the input. The error message " > > > > python: Fatal IO error 11 (Resource temporarily unavailable) on X server > :0.0 > > > > also printed during runtime. Any suggestions are welcome. Both the > > simulation flow graph and the flow graph used over the air are attached. > > > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/ > attachments/20180212/dc740c0d/attachment.html> > > ------------------------------ > > Message: 4 > Date: Mon, 12 Feb 2018 10:21:17 -0500 > From: Michael Dickens <michael.dick...@ettus.com> > To: Tellrell White <rell...@gmail.com>, Discuss-gnuradio@gnu.org > Subject: Re: [Discuss-gnuradio] Customized Block Giving Incorrect > Output > Message-ID: > <1518448877.1183410.1268050688.756FF612@webmail. > messagingengine.com> > Content-Type: text/plain; charset="utf-8" > > In GRC, you open the "complex to ||^2" block settings & set the vector > length to whatever you want. I'd advise using a variable that's defined > in GRC, and then use it for any blocks that require the vector setting; > that way you can change the variable value & all blocks are updated with > it. Hope this is useful. - MLD > On Mon, Feb 12, 2018, at 10:17 AM, Tellrell White wrote: > > Thanks for the response. That's exactly what I'm trying to accomplish. > > You mention the "complex to ||^2 can be vectorized. My question is how > > exactly do you go about doing that? > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/ > attachments/20180212/9522ce8d/attachment.html> > > ------------------------------ > > Message: 5 > Date: Mon, 12 Feb 2018 16:36:16 +0000 > From: M?ller, Marcus (CEL) <muel...@kit.edu> > To: "michael.dick...@ettus.com" <michael.dick...@ettus.com>, > "Discuss-gnuradio@gnu.org" <Discuss-gnuradio@gnu.org>, > "rell...@gmail.com" <rell...@gmail.com> > Subject: Re: [Discuss-gnuradio] Customized Block Giving Incorrect > Output > Message-ID: <1518453376.6611.64.ca...@kit.edu> > Content-Type: text/plain; charset="utf-8" > > Just another thought: Why convert every single FFT output vector from > linear to dB with a logarithm (that's a very complicated function!) > just to then compare it to a threshold, if you could also just convert > the threshold to linear once? > > Best regards, > Marcus > On Mon, 2018-02-12 at 10:21 -0500, Michael Dickens wrote: > > In GRC, you open the "complex to ||^2" block settings & set the vector > length to whatever you want. I'd advise using a variable that's defined in > GRC, and then use it for any blocks that require the vector setting; that > way you can change the variable value & all blocks are updated with it. > Hope this is useful. - MLD > > > > On Mon, Feb 12, 2018, at 10:17 AM, Tellrell White wrote: > > > Thanks for the response. That's exactly what I'm trying to > accomplish. You mention the "complex to ||^2 can be vectorized. My > question is how exactly do you go about doing that? > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -------------- next part -------------- > A non-text attachment was scrubbed... > Name: smime.p7s > Type: application/x-pkcs7-signature > Size: 6582 bytes > Desc: not available > URL: <http://lists.gnu.org/archive/html/discuss-gnuradio/ > attachments/20180212/ef7f8a2f/attachment.bin> > > ------------------------------ > > Subject: Digest Footer > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > ------------------------------ > > End of Discuss-gnuradio Digest, Vol 184, Issue 11 > ************************************************* >
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