[Discuss-gnuradio] rtl-sdr weirdness at lower frequencies (below 27.675MHz)

2019-03-06 Thread Marcus D. Leech
Tracked down a weird quirk in the rtl-sdr library this evening. I was having problems with lower frequencies working, but only at sample-rates >300e3. There's a piece of code that tries to optimize selection of IF frequency and filters based on sample-rate. For some sample-rates, a lower

Re: [Discuss-gnuradio] GSOC : GNU Radio Projects

2019-03-06 Thread Isuru Nuwanthilaka
Hi, I am searching on the background details of Android/GR development. What are the available resources in the community? Best On Mon, Mar 4, 2019 at 2:07 AM Müller, Marcus (CEL) wrote: > Hi Isuru, > > nice hearing from you! > Although I'd not be your mentor directly, it's exciting to hear

Re: [Discuss-gnuradio] Custom Block to Output Items that Meet Criteria

2019-03-06 Thread Nick Foster
Sure, no problem, use a gr::block. Just call consume() to tell the scheduler how many items you consumed, and return the number of samples you produced -- subject to the size of the output buffer. general_work() gets the size of your input and output buffers from ninput_items and noutput_items.

[Discuss-gnuradio] Custom Block to Output Items that Meet Criteria

2019-03-06 Thread Mark Gannet
Is it possible to write a custom block that only copies items to the output buffer if they meet a certain criterion? I'm thinking of something like a "keep m of n" block but where there is no knowledge of the number of items that will be written to the output buffer when entering the work

Re: [Discuss-gnuradio] Modulation order of FSK

2019-03-06 Thread CEL
Really quickly, I need to get going: with unpacked-to-packed (or vice versa) you can convert your bit stream to integers between 0 and 3. Convert to float, subtract 1.5, use with frequency modulator? Best regards, Marcus On Wed, 2019-03-06 at 18:14 +0300, Batu Kaplan wrote: > Hello, Marcus. >

Re: [Discuss-gnuradio] [USRP-users] continous Tx voice transmission

2019-03-06 Thread Marcus Müller
I've had rather longish discussions on how to solve this; essentially: for something that actually *solves* the issue (instead of postponing it), as Ian said, you'd need to have clock domain crossing ability. Assuming you do that in GNU Radio, you'd end up with the problem of needing to know

[Discuss-gnuradio] GSOC - Introduction and Project Idea Discussion

2019-03-06 Thread Mayank Jhamtani
Hello all, My name is Mayank, and I am interested to participate in GSoC'19 as a student. I would want to work on the project "Standardized High Throughput FEC Codes". This project interests me because I have been studying coding theory for the past two years, and I would love to work on

Re: [Discuss-gnuradio] Modulation order of FSK

2019-03-06 Thread Batu Kaplan
Hello, Marcus. First of all, I'm very grateful for your answer. But how I can make a connection between the bits and the "baseband frequency values" that you mentioned in the mail? For example, I have a 000110 bit series for 4FSK. And then, I think I need to pack into 2 bits like 00-01-10. But