Re: [Discuss-gnuradio] undocumented SBX behavior

2014-02-02 Thread Activecat
Dear Marcus, At the receiver USRP, does the SBX daughtercard have any mechanism of phase-lock-loop (PLL) ? I guess the daughtercard should have it because PLL is essential for quadrature downconversion. Please advise, thanks. Regards, activecat On Sat, Jan 11, 2014 at 1:19 PM, Marcus Leech

[Discuss-gnuradio] delay line

2014-02-02 Thread MHMND Herath
Dear Sir I created a C++ sync block and inserted out[i]=in[i-100] I wanted to get 100th earliest sample continuously. It worked. But I wanted to know will this correct when it connected to a source continuously. Thanks Neil ___

Re: [Discuss-gnuradio] Unable to stop the flow graph after calling stop()

2014-02-02 Thread Martin Braun
On 01.02.2014 13:51, Activecat wrote: But the function stop() fails to work. The flow graph continue executing infinitely... Question: How to stop the flow graph when this-d_complete == true ? Return -1 (or WORK_DONE) in your work() function. MB

Re: [Discuss-gnuradio] delay line

2014-02-02 Thread Martin Braun
On 02.02.2014 14:14, MHMND Herath wrote: Dear Sir I created a C++ sync block and inserted out[i]=in[i-100] I wanted to get 100th earliest sample continuously. It worked. But I wanted to know will this correct when it connected to a source continuously. Thanks Neil You probably want

Re: [Discuss-gnuradio] gr-fosphor : New RTSA-like visualization block for GNURadio using GPU acceleration

2014-02-02 Thread Markus
Hi Sylvain, I am lucky to have a new Laptop with i7 Haswell CPU, however you have written on gr-fosphor homepage that intel does not offer OpenCL for Haswell on Linux. (Appearantly due to some self cannibalization issue of their products if done so, as suggested somewhere else on the internet).

[Discuss-gnuradio] Live DVD for i386 ?

2014-02-02 Thread Kristoff Bonne
Hi all, First, I like to thank everybody at the FOSDEM SDR devroom today. I really really learned a lot today! I want to try to use GR for a session on how dooes a 433 Mhz ISM signal look like in our local radio-club. For that, I want to use the live-CD / DVD of gnuradio so that

Re: [Discuss-gnuradio] Stop GRC flow graph after defined time

2014-02-02 Thread Marcus Müller
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi Activecat! On 02.02.2014 03:30, Activecat wrote: Thanks. This solves the problem completely. :) Cool. In summary, to stop the flowgraph when the source is empty, we need to: 1). The source block's work() method returns WORK_DONE ( which

Re: [Discuss-gnuradio] delay line

2014-02-02 Thread Marcus Müller
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Yes, it will. The GNU Radio scheduler calls your block's work() function whenever it needs new data. Anyway, this is a very basic principle of GR; I recommend working through the creating an OOT module tutorial, it's really great! Greetings, Marcus

Re: [Discuss-gnuradio] delay line

2014-02-02 Thread Marcus Müller
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Forgot to mention: You must call the set_history() function accordingly! On 03.02.2014 00:13, Marcus Müller wrote: Yes, it will. The GNU Radio scheduler calls your block's work() function whenever it needs new data. Anyway, this is a very basic

Re: [Discuss-gnuradio] Stop GRC flow graph after defined time

2014-02-02 Thread Activecat
Dear Marcus, Thanks for thorough explanation. Let me summarize the information, as below. Correct me if I am wrong. 1). For sink block derived from gr::sync_block, its work() function should return noutput_items, even though sink block doesn't produce any output. This is a norm.