Re: [Discuss-gnuradio] Audio transmitting question

Hi Marcus.

Thank you very match for your responses. 
1. I use HackRFs, both with latest firmware. I  do not receive any Error-Messages in Debug Console. But, as I exposed smaller Samplerate in "Osmocom"-Block or used wav-File with larger Samplerate, streamed "UUU" and "OOO" Symbols in Console an Transmitter and Receiver side respectively.
2. I meant Mbit/s :-)
3. I used "Trhrottle"-Block because it was so advised in this topic:https://github.com/gnuradio/gnuradio/issues/1314
4. Yes, i did it in order to compensate Frequency-Offset.
5. Ok, i will try. Thank you!
I hope that my answers will help solve the problem with the use of existing blocks.
Best regards,
Timur

On 15.12.2017 23:06, Müller, Marcus (CEL) wrote:

Just a few notes, before I head to bed:    * Which SDR device are you using? From the top of my head, I can't  think of one that supports a 32 kS/s sampling rate. Do you get output  that says "couldn't use sampling rate" or similar?  * In your original question you said you're using "1.25 Mps" (what's  "Mps", by the way?). That clashes with 32 kS/s.  * Never, never, never use "Throttle" in a flow graph with hardware.  Read the output on the console!! GRC **warns** you about that.  * Your receiver is tuned off by 25 kHz. Is that intentional?   * Your transceiver is completely based on deprecated blocks. Don't use  those; use the packet/header mux and demux instead.    Best regards,  Marcus      On Fri, 2017-12-15 at 22:17 +0100, Timur Karychev wrote:  

Hi Marcus,   Please find attached Screenshots of (tx/rx) flowgraphs that I used to  transfer the file.   Without Codecs. The sound lasts well for several tens of seconds,  then errors are heard. I'm transmitting the wav file with 8 KHz  Samplerate.    I hope you can help in this matter. Looking forward to receiving your  reply. Thank you.  Timur    On 15.12.2017 17:17, Müller, Marcus (CEL) wrote:  

Hi Timur,    there's infinitely many things that can go wrong – this might be a  design mistake, this might be device imperfections, or this might  really just be noise on your wireless channel.    So, without you posting all details about your transmitter/receiver  implementation, this will be pretty impossible to answer!    Looking forward to more info,  Regards,  Marcus