# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=7 [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:** 8 --- ## [GnuRadio: Clock Recovery MM: imu out of bounds](https://www.ruby-forum.com/t/gnuradio-clock-recovery-mm-imu-out-of-bounds/243061)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 5\ **Last updated:** [September 7, 2015, 10:40am UTC](https://www.ruby-forum.com/t/gnuradio-clock-recovery-mm-imu-out-of-bounds/243061 "2015-09-07T10:40:17Z")
I have created a flowgraph, based on an example of Michael O., which takes in a signal, and should output bits.I need to use the clock recovery MM block, which I do not fully understand yet. However, after reading som… --- ## [ATSC won't work with SDRPlay](https://www.ruby-forum.com/t/atsc-wont-work-with-sdrplay/243259)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [September 6, 2015, 11:10pm UTC](https://www.ruby-forum.com/t/atsc-wont-work-with-sdrplay/243259 "2015-09-06T23:10:24Z")
Hi all. I’ve been trying to get the ATSC pipeline to work with 8MHz RF spectrum recordings from the SDRPlay. When I provide a 16-bit RAW IQ recording from HDSDR, centered on the TV channel, the script runs at 100% CPU… --- ## [How to calculate BER in different modulations with OFDM using GNURadio Companion](https://www.ruby-forum.com/t/how-to-calculate-ber-in-different-modulations-with-ofdm-using-gnuradio-companion/243270)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [September 6, 2015, 12:57pm UTC](https://www.ruby-forum.com/t/how-to-calculate-ber-in-different-modulations-with-ofdm-using-gnuradio-companion/243270 "2015-09-06T12:57:01Z")
Hello Jawad, Today I send the same message that I sent a few days ago because I realized I did not include GRC code files. Those files are necessary to detect errors. I’ve made the changes you said. As you say, when… --- ## [Struggling with gr-perf-monitorx](https://www.ruby-forum.com/t/struggling-with-gr-perf-monitorx/242344)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [September 6, 2015, 7:35am UTC](https://www.ruby-forum.com/t/struggling-with-gr-perf-monitorx/242344 "2015-09-06T07:35:44Z")
I have this “nearly” working. MX brings up a window, connects to GRC, briefly displays a graph, then blanks out. Displayed in the command line window: gr-perf-monitorx: radio.getKnobs threw exception (math domain erro… --- ## [Gr-rds](https://www.ruby-forum.com/t/gr-rds/243112)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 7\ **Last updated:** [September 5, 2015, 9:41pm UTC](https://www.ruby-forum.com/t/gr-rds/243112 "2015-09-05T21:41:39Z")
Hi, I am using GNU Radio 3.7.7.2 and I checked out out and built gr-rds. However RDS Decoding is not working. I found that there are to two connections have dashed lines (see picture). And in the terminal all I get i… --- ## [How to calculate BER in different modulations with OFDM using GNURadio Companion](https://www.ruby-forum.com/t/how-to-calculate-ber-in-different-modulations-with-ofdm-using-gnuradio-companion/243186)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 6\ **Last updated:** [September 5, 2015, 11:53am UTC](https://www.ruby-forum.com/t/how-to-calculate-ber-in-different-modulations-with-ofdm-using-gnuradio-companion/243186 "2015-09-05T11:53:59Z")
Hello, I’m doing my College final project about gnuradio companion. Specifically I have to calculate the BER with OFDM using different modulations to the subcarriers. After that, I have to do a graphic with the BER n… --- ## [Inverse of cyclic prefix adder](https://www.ruby-forum.com/t/inverse-of-cyclic-prefix-adder/243252)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 4\ **Last updated:** [September 5, 2015, 10:18am UTC](https://www.ruby-forum.com/t/inverse-of-cyclic-prefix-adder/243252 "2015-09-05T10:18:37Z")
Hii In OFDM system, at the receiver side i want to remove initial ‘x’ symbols from the every ‘x+fft\_len’ symbols. How can i do this ? Is there any block? or i need to create one… Thanks. --- ## [GNU Radio live USB. GRUB2 broken, how to fix it?](https://www.ruby-forum.com/t/gnu-radio-live-usb-grub2-broken-how-to-fix-it/243260)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [September 5, 2015, 5:48am UTC](https://www.ruby-forum.com/t/gnu-radio-live-usb-grub2-broken-how-to-fix-it/243260 "2015-09-05T05:48:41Z")
Hi! I Installed GNU Radio live on a usb stick and I was changing some aspects of its configuration. I like to delete some entries of the boot menu (is to use with my students at class and I don’t one anyone to use “i… --- ## [USRP timing offset](https://www.ruby-forum.com/t/usrp-timing-offset/243224)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 2\ **Last updated:** [September 4, 2015, 7:31pm UTC](https://www.ruby-forum.com/t/usrp-timing-offset/243224 "2015-09-04T19:31:48Z")
Hi everyone! I’m new to Gnuradio e USRP. I use a USRP N210 with WBX daughterboards and loop back cable to connect TX e RX. I have tested USRP with a simple flowgraph (sine , usrp\_sink , usrp\_source) and I have observ… --- ## [Constellation Objects & Messages](https://www.ruby-forum.com/t/constellation-objects-messages/243255)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [September 4, 2015, 3:46pm UTC](https://www.ruby-forum.com/t/constellation-objects-messages/243255 "2015-09-04T15:46:08Z")
Hi, I’m using the gr-digital constellation decoder block in GRC (digital\_constellation\_decoder\_cb) with constellation objects such as digital.constellation\_qpsk(), etc. I want to modify the block such that it accepts… --- ## [BitRate USRP N210](https://www.ruby-forum.com/t/bitrate-usrp-n210/243246)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [September 4, 2015, 9:31am UTC](https://www.ruby-forum.com/t/bitrate-usrp-n210/243246 "2015-09-04T09:31:51Z")
Hello, What is the minimum bit-rate of the N210 ? There is any formula to define it ? The N210 has 16 bit samples (limited by the host-GigE) so up to 25MS/s. C. Freq = 846.8 MHz Bandwidth = 1MHz Channel Bandwidth … --- ## [GRCon15 Talk recordings](https://www.ruby-forum.com/t/grcon15-talk-recordings/243180)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 2\ **Last updated:** [September 4, 2015, 12:01am UTC](https://www.ruby-forum.com/t/grcon15-talk-recordings/243180 "2015-09-04T00:01:32Z")
Hi, For anyone interested into digging into this, here are some recordings of the mic RF signal during talks at GRCon 15 http://people.osmocom.org/~tnt/grcon/mic-f5.030000e%2B08-s2.000000e%2B06-t20150826090018.cfile h… --- ## [How to add a new block](https://www.ruby-forum.com/t/how-to-add-a-new-block/243234)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 2\ **Last updated:** [September 3, 2015, 6:51pm UTC](https://www.ruby-forum.com/t/how-to-add-a-new-block/243234 "2015-09-03T18:51:31Z")
I am getting lots of error in basic square block itself. so please give me a step by step procedure to add a new block. --- ## [ATSC blocks](https://www.ruby-forum.com/t/atsc-blocks/243244)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [September 3, 2015, 4:04pm UTC](https://www.ruby-forum.com/t/atsc-blocks/243244 "2015-09-03T16:04:26Z")
I’ve got more info on my problem. Some of the blocks, including ATSC Field Sync Demux, are missing. Could they have been renamed or combined into other blocks? I don’t understand why blocks would be missing from the l… --- ## [Cc1101](https://www.ruby-forum.com/t/cc1101/243184)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [September 3, 2015, 3:00pm UTC](https://www.ruby-forum.com/t/cc1101/243184 "2015-09-03T15:00:10Z")
I want to demodulate signal generated by CC1101 with USRP and Gnuradio, and my signal information listed below: Modulation : GFSK Preamble 4 bytes sync 4 byte Packet length fix Manchester Disable CRC Check no W… --- ## [GNU Radio Live SDR Environment 3.7.3 released](https://www.ruby-forum.com/t/gnu-radio-live-sdr-environment-3-7-3-released/239892)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [September 3, 2015, 1:21pm UTC](https://www.ruby-forum.com/t/gnu-radio-live-sdr-environment-3-7-3-released/239892 "2015-09-03T13:21:26Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Ctrlport\_probe2\_x with gr-ctrlport-monitor in the absence of samples](https://www.ruby-forum.com/t/ctrlport-probe2-x-with-gr-ctrlport-monitor-in-the-absence-of-samples/243241)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [September 3, 2015, 1:18pm UTC](https://www.ruby-forum.com/t/ctrlport-probe2-x-with-gr-ctrlport-monitor-in-the-absence-of-samples/243241 "2015-09-03T13:18:31Z")
I’m attempting to use ctrlport\_probe2\_x and gr-ctrlport-monitor to probe points in a bursty flowgraph. When I place a ctrlport\_probe2\_x probe somewhere in the part of my flowgraph that process samples only upon recep… --- ## [FSK receiver](https://www.ruby-forum.com/t/fsk-receiver/243177)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 5\ **Last updated:** [September 3, 2015, 10:06am UTC](https://www.ruby-forum.com/t/fsk-receiver/243177 "2015-09-03T10:06:20Z")
Dear all, I have just built a FSK receiver aim to receive Cubesat data with FSK modulation with 9600 baud rate, below is my flow graph. I have just tested it with usb dongle RTL-SDR, however when I’m using audio sin… --- ## [Possible typos in a GRCon15 presentation?](https://www.ruby-forum.com/t/possible-typos-in-a-grcon15-presentation/243207)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 2\ **Last updated:** [September 3, 2015, 2:53am UTC](https://www.ruby-forum.com/t/possible-typos-in-a-grcon15-presentation/243207 "2015-09-03T02:53:25Z")
In a presentation ‘Stream Tags, PDUs, and Message Passing’ by Tom Rondeau, it seems some minor typos in pp. 14-18 Assuming my knowledge is correct, add\_item\_tag() should use offset of output buffer, not input buffer.… --- ## [Meta file time stamp](https://www.ruby-forum.com/t/meta-file-time-stamp/243231)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [September 2, 2015, 9:52pm UTC](https://www.ruby-forum.com/t/meta-file-time-stamp/243231 "2015-09-02T21:52:35Z")
Dear All, We are experiencing unexpected behavior with the time stamps in the meta file headers. It appears that in cases where the flowgraph experiences data drops, the timestamp is properly updated. However, i… --- ## [New random number generator](https://www.ruby-forum.com/t/new-random-number-generator/243222)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 10\ **Last updated:** [September 2, 2015, 7:46pm UTC](https://www.ruby-forum.com/t/new-random-number-generator/243222 "2015-09-02T19:46:24Z")
Hi! I have discovered that the implemented random number generator in gnuradio (see file \[0\]) is almost older than me. As written in the code, the implementation is taken from ‘Numerical recipes in C’ (see version fr… --- ## [Changing GUI structure on the fly](https://www.ruby-forum.com/t/changing-gui-structure-on-the-fly/243226)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [September 2, 2015, 5:51pm UTC](https://www.ruby-forum.com/t/changing-gui-structure-on-the-fly/243226 "2015-09-02T17:51:53Z")
Hello I have a question: I have to program one application, that will switch between about 20 modulations. With 20 modulations, program will have a lot of parameters to change, so GUI needs to change during runtime. … --- ## [Consolidated Logic at GRCon](https://www.ruby-forum.com/t/consolidated-logic-at-grcon/243223)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [September 2, 2015, 4:30pm UTC](https://www.ruby-forum.com/t/consolidated-logic-at-grcon/243223 "2015-09-02T16:30:39Z")
Hello All, My name is Ryan M., I’m a founder of Consolidated Logic, a new company based out of Blacksburg, VA working on an FPGA productivity tool we call RDA: Rapid Design Assembly. We had a booth at GRCon this year… --- ## [Block without work function won't stop](https://www.ruby-forum.com/t/block-without-work-function-wont-stop/242090)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [September 2, 2015, 3:38pm UTC](https://www.ruby-forum.com/t/block-without-work-function-wont-stop/242090 "2015-09-02T15:38:03Z")
Hi all, I have a block that is used only for acepting messages and writing their content into database. The block is written in python and it has no work function, but only constructor and message handler. However whe… --- ## [Win32 and gr-blocks/lib/stream\_pdu\_base.cc](https://www.ruby-forum.com/t/win32-and-gr-blocks-lib-stream-pdu-base-cc/232356)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [September 1, 2015, 11:44pm UTC](https://www.ruby-forum.com/t/win32-and-gr-blocks-lib-stream-pdu-base-cc/232356 "2015-09-01T23:44:39Z")
Since my previous message seems to be ignored, here is something simpler for you to comment on. In gr-blocks/lib/stream\_pdu\_base.cc, the read() and write() functions are used on sockets. This doesn’t work well on Win… --- ## [Gain and Sample Rate Setting](https://www.ruby-forum.com/t/gain-and-sample-rate-setting/243185)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 14\ **Last updated:** [September 1, 2015, 10:53pm UTC](https://www.ruby-forum.com/t/gain-and-sample-rate-setting/243185 "2015-09-01T22:53:14Z")
Hello all, I have XCVR2450 USRP’s. I have been trying to send the data between two USRP’s. I have made some changes to the python code in uhd\_interface.py where I have changed the gain to 25 and set the frequency for … --- ## [Usrp n210](https://www.ruby-forum.com/t/usrp-n210/243196)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 4\ **Last updated:** [September 1, 2015, 8:56pm UTC](https://www.ruby-forum.com/t/usrp-n210/243196 "2015-09-01T20:56:21Z")
Hello, What is the result/consequence of running the max\_power.py on USRP2 ? How to revert back ? Thank you Abs --- ## [Re: Better approach for FEC](https://www.ruby-forum.com/t/re-better-approach-for-fec/243212)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [September 1, 2015, 7:30pm UTC](https://www.ruby-forum.com/t/re-better-approach-for-fec/243212 "2015-09-01T19:30:28Z")
system. want to insert FEC in tx and rx. Bob though, so when you move from a stream into a PDU-based system, you’ll want to stay there. Performance is going to be dependent on the rest of your system as well. … --- ## [Ni usrp 2900](https://www.ruby-forum.com/t/ni-usrp-2900/243205)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [September 1, 2015, 6:53pm UTC](https://www.ruby-forum.com/t/ni-usrp-2900/243205 "2015-09-01T18:53:04Z")
Hello, is the NI usrp-2900 usable with GNURadio (and related sw)? It seems to be “like” a B200, but I’ve not found enough details of the product. Thanks BR Fabio --- ## [General\_Work Not Executing](https://www.ruby-forum.com/t/general-work-not-executing/243173)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 4\ **Last updated:** [September 1, 2015, 6:28pm UTC](https://www.ruby-forum.com/t/general-work-not-executing/243173 "2015-09-01T18:28:32Z")
Hello All, I recently rewrote the Chat Sanitize and Chat Receiver blocks from the Tutorial module(Example 5) in C++. I did this because I wanted to add an acknowledgment feature into the blocks in order to add some ro… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=6) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=8)