# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=17 [Latest](https://www.ruby-forum.com/latest.md) · [Categories](https://www.ruby-forum.com/categories.md) · [Tags](https://www.ruby-forum.com/tags.md) **Page:** 18 --- ## [Ctrl Input Sample and Hold](https://www.ruby-forum.com/t/ctrl-input-sample-and-hold/242378)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 19, 2015, 4:06pm UTC](https://www.ruby-forum.com/t/ctrl-input-sample-and-hold/242378 "2015-06-19T16:06:01Z")
Hello, guys. What’s up? I’m having some troubles using Sample and Hold block in GNUradio. The Ctrl Input seems like a “Byte” Input but I don’t know how to control it and which kind of block I have to use. Have anyone… --- ## [Overlapping channels in polyphase channelizer](https://www.ruby-forum.com/t/overlapping-channels-in-polyphase-channelizer/242367)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [June 19, 2015, 3:18pm UTC](https://www.ruby-forum.com/t/overlapping-channels-in-polyphase-channelizer/242367 "2015-06-19T15:18:13Z")
Is it possible to have overlapping channels in a polyphase channelizer? say you have 10MHz of bandwidth, and you want to break it up into 10 channels, each 2MHz wide with the center frequencies being 1MHz apart. wou… --- ## [2nd IEEE Signal Intelligence Challenge 2015: Final report](https://www.ruby-forum.com/t/2nd-ieee-signal-intelligence-challenge-2015-final-report/242374)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 19, 2015, 2:20pm UTC](https://www.ruby-forum.com/t/2nd-ieee-signal-intelligence-challenge-2015-final-report/242374 "2015-06-19T14:20:57Z")
Hi all, I’m happy to forward the final report on this year’s IEEE Signal Intelligence Challenge which we organized in Karlsruhe and Darmstadt in the past months! – Felix FINAL REPORT: After its debut in 2014, the 2… --- ## [SOCIS project update 3](https://www.ruby-forum.com/t/socis-project-update-3/242373)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 19, 2015, 10:27am UTC](https://www.ruby-forum.com/t/socis-project-update-3/242373 "2015-06-19T10:27:17Z")
Hey community, It is time for another project update. So here it is. This week I dived into C++ and FECAPI. I implemented a polar encoder for FECAPI. Of course this includes all the necessary tests. I decided to go w… --- ## [Making our own signal processing block in GRC](https://www.ruby-forum.com/t/making-our-own-signal-processing-block-in-grc/242371)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 19, 2015, 9:46am UTC](https://www.ruby-forum.com/t/making-our-own-signal-processing-block-in-grc/242371 "2015-06-19T09:46:08Z")
I’m referring the website https://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules for the purpose of making my own signal processing block in GRC for squaring the value. I’ve completed all the steps succ… --- ## [Question on tags - offsets](https://www.ruby-forum.com/t/question-on-tags-offsets/242370)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 19, 2015, 7:30am UTC](https://www.ruby-forum.com/t/question-on-tags-offsets/242370 "2015-06-19T07:30:19Z")
Hi, A quick question on tags. I’m coding a custom block in python and my forecast function is like so: def forecast(self, noutput\_items, ninput\_items\_required): #setup size of input\_items\[i\] for work call for i in r… --- ## [Embedded WG](https://www.ruby-forum.com/t/embedded-wg/242326)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [June 19, 2015, 5:43am UTC](https://www.ruby-forum.com/t/embedded-wg/242326 "2015-06-19T05:43:23Z")
Recently I was asked how people can help with the embedded working group. Currently, I a very happy with our support for Zynq based boards. I’ve put together a list othings I think we can improve. Embedded Working goa… --- ## [Buffers and Sample Rates](https://www.ruby-forum.com/t/buffers-and-sample-rates/242364)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [June 18, 2015, 10:14pm UTC](https://www.ruby-forum.com/t/buffers-and-sample-rates/242364 "2015-06-18T22:14:08Z")
Hi all, I’m working on a system that has hardware defining an input rate and hardware defining an output rate. This is a data based system, so I can’t afford to lose any bits, which implies sample rate changes have t… --- ## [Extended\_encoder ignores get\_output\_conversion()](https://www.ruby-forum.com/t/extended-encoder-ignores-get-output-conversion/242362)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 18, 2015, 8:50pm UTC](https://www.ruby-forum.com/t/extended-encoder-ignores-get-output-conversion/242362 "2015-06-18T20:50:01Z")
Hey list, ‘extended\_encoder’ currently ignores whatever ‘get\_output\_conversion’ returns. If you use FEC’s extended encoder and you reimplement ‘get\_output\_conversion’, it gets ignored. A quick look at the available … --- ## [Active Reflector](https://www.ruby-forum.com/t/active-reflector/242360)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [June 18, 2015, 8:35pm UTC](https://www.ruby-forum.com/t/active-reflector/242360 "2015-06-18T20:35:24Z")
Hello all, I’m trying to do ranging using two USRPs N210. The idea is that the first USRP sends a signal and then the second USRP recognize it and send the signal back. Looking to the turnaround time I would be able … --- ## [Channel Model block - Epsilon effect on band edges](https://www.ruby-forum.com/t/channel-model-block-epsilon-effect-on-band-edges/242350)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [June 18, 2015, 7:32pm UTC](https://www.ruby-forum.com/t/channel-model-block-epsilon-effect-on-band-edges/242350 "2015-06-18T19:32:18Z")
Questions about the Channel Model block from gr::channels::channel\_model Noiose Voltage and Frequency Offset work as expected. I’ve been using a Seed of 0 and no multipath so Taps of 1+0i. Have not seen any issue ther… --- ## [Infinite receive and transmission](https://www.ruby-forum.com/t/infinite-receive-and-transmission/242356)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [June 18, 2015, 4:38pm UTC](https://www.ruby-forum.com/t/infinite-receive-and-transmission/242356 "2015-06-18T16:38:46Z")
Hello list, I am beginner for USRP networked series N210. I have two N210 connected to my host i.e. laptop. I am trying to check transmission and reception using two USRP . When i am passing the command for transmi… --- ## [Issues with N210](https://www.ruby-forum.com/t/issues-with-n210/242355)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 18, 2015, 3:43pm UTC](https://www.ruby-forum.com/t/issues-with-n210/242355 "2015-06-18T15:43:48Z")
Hello All, I would like to know that is the USRP2 needs separate installation on the host or It will work smoothly with the USRP 1 configured host?? I have a host configured for USRP 1, I used these for few lab work… --- ## [Re: problem with ofdm link](https://www.ruby-forum.com/t/re-problem-with-ofdm-link/242346)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [June 18, 2015, 9:43am UTC](https://www.ruby-forum.com/t/re-problem-with-ofdm-link/242346 "2015-06-18T09:43:57Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Unpack k bits block with a new created block](https://www.ruby-forum.com/t/unpack-k-bits-block-with-a-new-created-block/242345)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [June 18, 2015, 9:34am UTC](https://www.ruby-forum.com/t/unpack-k-bits-block-with-a-new-created-block/242345 "2015-06-18T09:34:36Z")
HI I’m using the unpack k bits block (which is located at the output of a vector source), before the new block that I’m trying to create. I would want to save all the bits at the output of the unpacked k bits block, … --- ## [CPU usage when hdlc framer is used](https://www.ruby-forum.com/t/cpu-usage-when-hdlc-framer-is-used/242334)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 7\ **Last updated:** [June 17, 2015, 3:35pm UTC](https://www.ruby-forum.com/t/cpu-usage-when-hdlc-framer-is-used/242334 "2015-06-17T15:35:37Z")
Hi, CPU usage goes to 100% when the hdlc\_framer block is used! To verify this I did the following tests: message\_strobe\_random ----\> message\_debug (CPU usage 2%) message\_strobe\_random ----\> hdlc\_framer----\> null\_si… --- ## [Variable type while creating a block](https://www.ruby-forum.com/t/variable-type-while-creating-a-block/242343)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [June 17, 2015, 5:13am UTC](https://www.ruby-forum.com/t/variable-type-while-creating-a-block/242343 "2015-06-17T05:13:26Z")
Hello If i set the input of my block as a byte, means that the block will handle 8 bits at a time and each item correspond to one bit of that byte? in\[0\] is the first bit and so on? Thank you. – View this message … --- ## [PSK Modulation-\>Demodulation](https://www.ruby-forum.com/t/psk-modulation-demodulation/242335)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [June 17, 2015, 1:54am UTC](https://www.ruby-forum.com/t/psk-modulation-demodulation/242335 "2015-06-17T01:54:45Z")
Hello, I know a similar question has been asked before on this mailing list but I didn’t quite get a solution out of it. I am generating a random byte source, either ones or zeroes, modulating them with DBPSK and im… --- ## [Reading I/0 port USRP](https://www.ruby-forum.com/t/reading-i-0-port-usrp/242341)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 16, 2015, 8:57pm UTC](https://www.ruby-forum.com/t/reading-i-0-port-usrp/242341 "2015-06-16T20:57:21Z")
Hello, I have recently created a GnuRadio program in python for a spectroscope that i’m working on. However there still remains a couple of functions that i need to implement, one of which requires to read a square wa… --- ## [Scanning desired frequenies](https://www.ruby-forum.com/t/scanning-desired-frequenies/242321)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 9\ **Last updated:** [June 16, 2015, 4:24pm UTC](https://www.ruby-forum.com/t/scanning-desired-frequenies/242321 "2015-06-16T16:24:27Z")
I have been trying to make my NI-B200 scan frequencies that I have in a text file for a couple days now. I was introduced to this mailing list through the GNU website and it has helped me alot these past few day, Than… --- ## [Why block's buffer was mapped to two address](https://www.ruby-forum.com/t/why-blocks-buffer-was-mapped-to-two-address/242319)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [June 16, 2015, 3:34pm UTC](https://www.ruby-forum.com/t/why-blocks-buffer-was-mapped-to-two-address/242319 "2015-06-16T15:34:48Z")
Hi, I found block’s buffer was mapped to two continues address, is there any benefit for this? When do update reader/writer pointer, I found they was rounded to the real buffer size, so I want to know which code will… --- ## [FEC in gnruadio](https://www.ruby-forum.com/t/fec-in-gnruadio/242332)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [June 16, 2015, 3:30pm UTC](https://www.ruby-forum.com/t/fec-in-gnruadio/242332 "2015-06-16T15:30:42Z")
Hi, I just stared working on FEC in gnuradio. I found that there is gr-fec. I want to know that which literature , books/papers, was followed during the implementation of the gr-fec so that I can go through the c++ … --- ## [How do I run gr-scan?](https://www.ruby-forum.com/t/how-do-i-run-gr-scan/242318)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [June 16, 2015, 10:46am UTC](https://www.ruby-forum.com/t/how-do-i-run-gr-scan/242318 "2015-06-16T10:46:12Z")
I downloaded this program that someone made hoping that it will help me but I don’t know how to run it. It’s on my computer but it doesn’t have a py file. What should I do? --- ## [Problem using fm\_demod.py](https://www.ruby-forum.com/t/problem-using-fm-demod-py/242287)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [June 15, 2015, 11:08pm UTC](https://www.ruby-forum.com/t/problem-using-fm-demod-py/242287 "2015-06-15T23:08:40Z")
Hi everyone, I recently started playing around with gnuradio, and being the beginner that I am, wanted to begin by listening to a close by radio station. I basically followed the instruction on http://www.trondeau.co… --- ## [Re: Illegal CustomBuild for MSVC 18](https://www.ruby-forum.com/t/re-illegal-custombuild-for-msvc-18/242323)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 15, 2015, 8:21pm UTC](https://www.ruby-forum.com/t/re-illegal-custombuild-for-msvc-18/242323 "2015-06-15T20:21:35Z")
I’ve also been struggling with the gnu-radio build in Windows (GNURadio 3.7.7.1, CMake 3.2.2, VisualStudio 12.0.31101.00 Update 4), and had the same problem. The illegal “” commands seem to be coming from the custom … --- ## [\[RFNoC\] Status Updates](https://www.ruby-forum.com/t/rfnoc-status-updates/242322)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 15, 2015, 7:42pm UTC](https://www.ruby-forum.com/t/rfnoc-status-updates/242322 "2015-06-15T19:42:27Z")
Hi Everyone, here’s a quick update on where RFNoC is right now. For the uninitiated, RFNoC is a system/framework/design/paradigm to easily create heterogeneous flow graphs between FPGAs and GPPs. To actually run it, … --- ## [Question about set\_output\_multiple](https://www.ruby-forum.com/t/question-about-set-output-multiple/242312)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [June 15, 2015, 6:49pm UTC](https://www.ruby-forum.com/t/question-about-set-output-multiple/242312 "2015-06-15T18:49:52Z")
Hello I’m trying to create a block whose number of outputs is the number of inputs, which i’m setting as a parameter of the block(named tamano),+ n, being n a parameter of the block too. For example, if i use a vecto… --- ## [Measuring performance of module](https://www.ruby-forum.com/t/measuring-performance-of-module/242291)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [June 15, 2015, 5:42am UTC](https://www.ruby-forum.com/t/measuring-performance-of-module/242291 "2015-06-15T05:42:21Z")
My OOT module seems to be almost done in implementation. I am wondering that which and how performance metric can be measured. I am considering the basic communication performance metrics such as throughput, BER/PER v… --- ## [Attempting gnuradio build on PCLinuxOS64 - fails](https://www.ruby-forum.com/t/attempting-gnuradio-build-on-pclinuxos64-fails/242308)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 14, 2015, 12:31pm UTC](https://www.ruby-forum.com/t/attempting-gnuradio-build-on-pclinuxos64-fails/242308 "2015-06-14T12:31:48Z")
This is my first posting to the mailing list, my apology for it being a bit on the long side and yet perhaps short of vital information. Despite the length my understanding is that for somebody with more experience th… --- ## [ADSB receiver?](https://www.ruby-forum.com/t/adsb-receiver/242303)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [June 13, 2015, 9:12am UTC](https://www.ruby-forum.com/t/adsb-receiver/242303 "2015-06-13T09:12:40Z")
Hi, I have gnuradio version v3.7.7.1 installed using pybombs. Installation was successful. I also installed “gr-air-modes” from the app store. Although the recipe installed with no problem, I cannot find how to use … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=16) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=18)