# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=24 [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:** 25 --- ## [Curiosity about implementation of block with multiple data type](https://www.ruby-forum.com/t/curiosity-about-implementation-of-block-with-multiple-data-type/241789)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 30, 2015, 5:14pm UTC](https://www.ruby-forum.com/t/curiosity-about-implementation-of-block-with-multiple-data-type/241789 "2015-04-30T17:14:37Z")
Looking better about implementation of blocks like fft,fir,etc a question rise in my brain. Why in blocks with selectable input/output data type there are C++ multiple file, each one with the specialization of a sin… --- ## [Catching the end of flowgraph execution](https://www.ruby-forum.com/t/catching-the-end-of-flowgraph-execution/241790)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 30, 2015, 4:51pm UTC](https://www.ruby-forum.com/t/catching-the-end-of-flowgraph-execution/241790 "2015-04-30T16:51:50Z")
Hello again guys, this is some kind of next stage of my previous queston. Namely, I have top block with two flowgraphs, rx\_path and tx\_path. tx\_path produces known number of samples during which time rx\_path receivee… --- ## [Restarting sub flow graph](https://www.ruby-forum.com/t/restarting-sub-flow-graph/241787)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 30, 2015, 4:46pm UTC](https://www.ruby-forum.com/t/restarting-sub-flow-graph/241787 "2015-04-30T16:46:34Z")
Hello again guys, in my applicatoin I have two flow graphs, namely, rx and tx paths, separated. TX path generates pseudorandom bit sequence which is then turned into digital signal and transmitted over LFTX board. Th… --- ## [Message passing(connect) in C++](https://www.ruby-forum.com/t/message-passing-connect-in-c/241788)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [April 30, 2015, 4:38pm UTC](https://www.ruby-forum.com/t/message-passing-connect-in-c/241788 "2015-04-30T16:38:58Z")
Hi all, I have another question. How can I connect the input and output port of different blocks,from inside a C++ block? In the documentation I’ve only seen the msg\_connect() for python Thanks, marco --- ## [Four channel tx/rx loopback failure](https://www.ruby-forum.com/t/four-channel-tx-rx-loopback-failure/241780)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 30, 2015, 12:40am UTC](https://www.ruby-forum.com/t/four-channel-tx-rx-loopback-failure/241780 "2015-04-30T00:40:00Z")
Hi, I am having a failure with the attached GRC flowgraph. It is a four channel Tx/Rx loopback using 2 Ettus X310 USRPs. The flowgraph is simple in that the Tx is simply a constant (center freq tone) and the Rx is … --- ## [Confirming uhd.set\_command\_time is working](https://www.ruby-forum.com/t/confirming-uhd-set-command-time-is-working/241737)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [April 29, 2015, 7:01pm UTC](https://www.ruby-forum.com/t/confirming-uhd-set-command-time-is-working/241737 "2015-04-29T19:01:41Z")
Hi all, I’m playing around with timed commands on the USRP, but I’m not sure I understand them correctly. I’ve got a usrp connected as “u” and set to center freq 700e6. u.set\_command\_time(u.get\_time\_now() + uhd.ti… --- ## [Correlation Estimation Block Oddity](https://www.ruby-forum.com/t/correlation-estimation-block-oddity/241671)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 12\ **Last updated:** [April 29, 2015, 5:52pm UTC](https://www.ruby-forum.com/t/correlation-estimation-block-oddity/241671 "2015-04-29T17:52:08Z")
Hello all, I’m using GR 3.7.8. I’m trying to work the new Correlation Estimation block into my design. I’m seeing what looks like unintended behavior for the tag placements. Sometimes the corr\_start tag is placed on… --- ## [Burst Tagger block - What I'm I doing wrong?](https://www.ruby-forum.com/t/burst-tagger-block-what-im-i-doing-wrong/241581)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 29, 2015, 4:37pm UTC](https://www.ruby-forum.com/t/burst-tagger-block-what-im-i-doing-wrong/241581 "2015-04-29T16:37:21Z")
Hi all! Im trying to implement a system that should change it’s normal functioning when another system with higher priority comes into play. For that, we have thought of two ways: changing the central frequency of o… --- ## [Announcing NEWSDR on Thr/Fri May 21/22 at WPI](https://www.ruby-forum.com/t/announcing-newsdr-on-thr-fri-may-21-22-at-wpi/241753)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 28, 2015, 5:43pm UTC](https://www.ruby-forum.com/t/announcing-newsdr-on-thr-fri-may-21-22-at-wpi/241753 "2015-04-28T17:43:45Z")
NEWSDR 2015 \* \* New England Workshop on Software-Defined Radio \* … --- ## [Many thanks](https://www.ruby-forum.com/t/many-thanks/241748)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 28, 2015, 2:59pm UTC](https://www.ruby-forum.com/t/many-thanks/241748 "2015-04-28T14:59:35Z")
Hello. Thanks for your great help for me about two rtl2832 dongles in a GRC project. The idea of Kevin R. of using osmosdr source block is usefull. My two rtl2832 dongles are working together now. Sincerely Igor Pop… --- ## [No scope with gr?](https://www.ruby-forum.com/t/no-scope-with-gr/241722)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [April 28, 2015, 12:02pm UTC](https://www.ruby-forum.com/t/no-scope-with-gr/241722 "2015-04-28T12:02:34Z")
Hi, With latest gnuradio the scope view refuses to work in my flowgraphs. Execution ends completely without any error message. Removing the block and putting it newly into the flowgraph changes nothing. Disabling the… --- ## [GNU Radio / Software Radio Trainings in Germany](https://www.ruby-forum.com/t/gnu-radio-software-radio-trainings-in-germany/241744)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 28, 2015, 11:54am UTC](https://www.ruby-forum.com/t/gnu-radio-software-radio-trainings-in-germany/241744 "2015-04-28T11:54:23Z")
Dear GNU Radio community, we are happy to announce that Fennec Research in cooperation with Munich Innovation Labs is offering GNU Radio User & Developer Trainings in Germany! Date: August 6, Thursday to August 7, Fr… --- ## [Is GNURadio compatible with python 3?](https://www.ruby-forum.com/t/is-gnuradio-compatible-with-python-3/241742)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 28, 2015, 2:22am UTC](https://www.ruby-forum.com/t/is-gnuradio-compatible-with-python-3/241742 "2015-04-28T02:22:06Z")
Hi Right now I’m using GNURadio and making my own blocks in python 2.7 and everything is good. I just wanted to know if I can do the same using python 3? Is GNURadio compatible with python 3 as of now? If it is, can … --- ## [Python Hier block using callback](https://www.ruby-forum.com/t/python-hier-block-using-callback/241724)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [April 27, 2015, 10:11pm UTC](https://www.ruby-forum.com/t/python-hier-block-using-callback/241724 "2015-04-27T22:11:47Z")
Hi all; I created a python hier block using signal source and a VCO, but I want to be able to control parameters like amplitude, sensitivity etc il real time using sliders. I used callback tag on xml together with… --- ## [Multiple flowgraphs and GUI elements](https://www.ruby-forum.com/t/multiple-flowgraphs-and-gui-elements/241729)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [April 27, 2015, 5:41pm UTC](https://www.ruby-forum.com/t/multiple-flowgraphs-and-gui-elements/241729 "2015-04-27T17:41:51Z")
Hi all guys, I am building a gnuradio top block application where I want to have rx and tx flographs. Something similar to the example provided with gnuradio. I want to make rx path and tx path, but the example doesn… --- ## [Polyphase Clock Synchronization with Matched Filter](https://www.ruby-forum.com/t/polyphase-clock-synchronization-with-matched-filter/241730)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [April 27, 2015, 4:13pm UTC](https://www.ruby-forum.com/t/polyphase-clock-synchronization-with-matched-filter/241730 "2015-04-27T16:13:38Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Module not showing up in companion](https://www.ruby-forum.com/t/module-not-showing-up-in-companion/241716)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 26, 2015, 1:18pm UTC](https://www.ruby-forum.com/t/module-not-showing-up-in-companion/241716 "2015-04-26T13:18:54Z")
I have built a custom source module. I followed the steps for coding and did a make, make test, make install. Then I did the gr\_modtool makexml my\_mod, and a 'make install again. I can see the module in /usr/local… --- ## [Multipath Fading](https://www.ruby-forum.com/t/multipath-fading/241708)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [April 26, 2015, 12:13pm UTC](https://www.ruby-forum.com/t/multipath-fading/241708 "2015-04-26T12:13:12Z")
Dear Sir/Mam, Hello, i am a student working on the development of a channel emulator, Can you tell me how can you make one in GNU Radio? --- ## [Re: UHD: USRP Source (Gerome Jan L)](https://www.ruby-forum.com/t/re-uhd-usrp-source-gerome-jan-l/241713)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 25, 2015, 10:44pm UTC](https://www.ruby-forum.com/t/re-uhd-usrp-source-gerome-jan-l/241713 "2015-04-25T22:44:20Z")
Hello, What I was trying to say is, how related is the sampling rate in the uhd: usrp source to the sampling rate in the adc which is 100MSPS? Thanks. --- ## [UHD: USRP Source](https://www.ruby-forum.com/t/uhd-usrp-source/241707)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 25, 2015, 10:54am UTC](https://www.ruby-forum.com/t/uhd-usrp-source/241707 "2015-04-25T10:54:38Z")
Hello, I’m trying to receive a 6 MHz TV signal. What frequency should I set my UHD: USRP Source in the GRC? Thanks. \*Gerome Jan M. Llames \* Engineering Research and Development for Technology (ERDT) Scholar Univers… --- ## [How do I use the Gnuradio GRC XML RPC client or server components?](https://www.ruby-forum.com/t/how-do-i-use-the-gnuradio-grc-xml-rpc-client-or-server-components/241677)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 25, 2015, 8:21am UTC](https://www.ruby-forum.com/t/how-do-i-use-the-gnuradio-grc-xml-rpc-client-or-server-components/241677 "2015-04-25T08:21:20Z")
Please understand, I know nothing about networking, client, server, rpc, marshaling, sockets, Python and all newer programming environments. However; I do know C,C++ and understand Windows messaging, wait for single … --- ## [Two rtl2832 dongles in a GRC project](https://www.ruby-forum.com/t/two-rtl2832-dongles-in-a-grc-project/241681)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 25, 2015, 2:53am UTC](https://www.ruby-forum.com/t/two-rtl2832-dongles-in-a-grc-project/241681 "2015-04-25T02:53:58Z")
I try to make project with two dongles rtl2832+r820. In GNU Radio Companion v3.7.6.1-58-g620817ed I made simple project with two equal channels containing rtl2832\_source block and blocks\_ctrlport\_probe2. And I have an… --- ## [Input vs output items query](https://www.ruby-forum.com/t/input-vs-output-items-query/241704)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 25, 2015, 1:21am UTC](https://www.ruby-forum.com/t/input-vs-output-items-query/241704 "2015-04-25T01:21:08Z")
Hi I have a block that takes n number of input samples and has to return n 5 samples. (something analogous to a cyclic prefix insertion. where the number of samples coming out will be more than the number going in) … --- ## [Phase coherence for N210 and SBX](https://www.ruby-forum.com/t/phase-coherence-for-n210-and-sbx/241688)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 12\ **Last updated:** [April 24, 2015, 11:43pm UTC](https://www.ruby-forum.com/t/phase-coherence-for-n210-and-sbx/241688 "2015-04-24T23:43:43Z")
Hi, I am working on phase coherent reception using 2 USRP N210s where each is mounted with a SBX. The 2 N210s are connected via a MIMO cable. 10MHz reference clock and PPS are generated by an OctoClock-G and are fed … --- ## [Uhd version](https://www.ruby-forum.com/t/uhd-version/241705)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 24, 2015, 9:21pm UTC](https://www.ruby-forum.com/t/uhd-version/241705 "2015-04-24T21:21:47Z")
Hi, I meet problems when I try to upgrade UHD to a version higher than 3.7.6.1. I follow these UHD installation instructions shown in the following link. sudo bash -c 'echo "deb http://files.ettus.com/binaries/uhd/… --- ## [GRCon15: Hotels](https://www.ruby-forum.com/t/grcon15-hotels/241686)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 24, 2015, 7:41pm UTC](https://www.ruby-forum.com/t/grcon15-hotels/241686 "2015-04-24T19:41:47Z")
In case folks are wondering, there are quite a few hotels and other lodging places within easy walking distance of the GRCon15 venue: the Center for Strategic and International Studies \[1\]. For whatever reason, places… --- ## [USRP2 and UHD 3.8.3](https://www.ruby-forum.com/t/usrp2-and-uhd-3-8-3/241689)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 24, 2015, 5:57pm UTC](https://www.ruby-forum.com/t/usrp2-and-uhd-3-8-3/241689 "2015-04-24T17:57:49Z")
Dear USRP2 users, (Note: this does not affect N2x0, or any other device! Only USRP2, with the SD-Card). The latest release (3.8.3) has an issue where UHD won’t let you use USRP2s. Apologies for missing that during te… --- ## [I & Q channels in source module](https://www.ruby-forum.com/t/i-q-channels-in-source-module/241690)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 24, 2015, 3:24pm UTC](https://www.ruby-forum.com/t/i-q-channels-in-source-module/241690 "2015-04-24T15:24:32Z")
I am writing a source module/block and I generate 16 bit signed I and Q values. There is first a 16 bit I value then a 16 bit Q value repeated 1024 times. In my source module I have: usbradio\_impl::usbradio\_impl() … --- ## [Re: Asking help about "gr-ieee802-11"](https://www.ruby-forum.com/t/re-asking-help-about-gr-ieee802-11/233987)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [April 24, 2015, 7:34am UTC](https://www.ruby-forum.com/t/re-asking-help-about-gr-ieee802-11/233987 "2015-04-24T07:34:13Z")
Dear Sir, I am referring to the same problem in https://www.ruby-forum.com/topic/4487026 but I am using Debian 7.7 AMD64. I am facing exactly the same problem, as below: It said i should open “/examples/wifi\_phy\_hie… --- ## [Why are malloc\_\ in gr::fft?](https://www.ruby-forum.com/t/why-are-malloc-type-in-gr-fft/241678)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [April 24, 2015, 4:01am UTC](https://www.ruby-forum.com/t/why-are-malloc-type-in-gr-fft/241678 "2015-04-24T04:01:50Z")
It’s not a big deal, but I’m just curious. Why are malloc functions, malloc\_complex, malloc\_double, malloc\_float in gr::fft ? I think memory allocating functions can be used in various purposes, not only in FFT. Is … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=23) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=25)