[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Discuss-gnuradio] Stuttered processing with OsmoSDR and DVB-T Stick

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Stuttered processing with OsmoSDR and DVB-T Stick
Date: Sat, 24 Nov 2012 08:32:28 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16

On 24/11/12 06:55 AM, Markus Gonser wrote:

I run gnuradio latest stable installation on a 64bit Ubuntu Installation with Pentium 977 + 8GB RAM. I use the DVB-T Hama Nano DVB-T-Stick which is one of the RTL-Chip derivates. I tried to create a FM-Radio reception which only consists of the OsmoSDR-Srouce, A WBFM Receive PLL and the Audio Sink (see attached png)

What I get is a stuttered signal processing of the recepition. I can here the radio signal, but it is interrupted at a rate of approximately 3 Hz. I checked the CPU load but it is well below 100%. Does anyone have an idea what I did wrong? I would appreciate any sort of suggestions. Thanks!

Additional experiment: when I make a chain of sine-wave -> WBFM-Transmitter -> WBFM-Receiver -> Audio Sink, with the sample rates as shown in the original fm receiver, there is continuous playback. Therefore I expect that it has something to do with the OsmoSDR, libusb, rtl-driver, rtl-chip.

Any suggestions?


m48/m48+ by Markus Gonser

m48  on the AppStore: http://itunes.com/apps/m48

_______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
705.6k is likely not a supported sample rate on the RTLSDR.

It's fairly rare that sample rates on any SDR are exactly multiples of audio rates, so you have to use
  rational resamplers, or fractional interpolators to match rates.

Principal Investigator
Shirleys Bay Radio Astronomy Consortium

reply via email to

[Prev in Thread] Current Thread [Next in Thread]