Re: [Discuss-gnuradio] audio underrun when bad signal quality

2015-09-23 Thread Marcus Müller
Hi Markus, maybe just a CPU hiccup? You can try to reduce CPU load by removing the decimating rational resampler, and integrate the decimation into the Low Pass (it does the same thing, with one filter less). By the way, there might be a slight mistake in your flow graph, as it is: After the first

Re: [Discuss-gnuradio] audio underrun when bad signal quality

2015-09-23 Thread Markus Heller
Hi Marcus, ok, here is the sketch: http://www.dl8rds.de/index.php/Datei:2015-09-18-gnuradio_rtlsdr1.png There is no squelch in the data path. But thanks a lot for explaining the effects of a squelch. Maybe there is another reason for my observation, because I unplugged my antenna from the rtlsd

Re: [Discuss-gnuradio] audio underrun when bad signal quality

2015-09-22 Thread Markus Heller
Hi Marcus, I have been reading from you more frequently on this list than you've been reading from me :-) I have my setup in my office computer, so I will send the setup to this list tomorrow. Thanks ahead! vy73 markus dl8rds Am Dienstag, den 22.09.2015, 19:56 +0200 schrieb Marcus Müller: > Hi

Re: [Discuss-gnuradio] audio underrun when bad signal quality

2015-09-22 Thread Markus Heller
no, there is no squelch 73s markus Am Dienstag, den 22.09.2015, 10:56 -0700 schrieb Martin Braun: > Do you have a sqelch anywhere in your flow graph? > > M > > On 22.09.2015 09:34, Markus Heller wrote: > > Hi, > > > > playing around with my RTLSDR stick (RTL2832U / Rafael Micro R820T > > tuner

Re: [Discuss-gnuradio] audio underrun when bad signal quality

2015-09-22 Thread Marcus Müller
Hi Markus, nice to be hearing from you! I'm making assumptions about your RX flow graph here: osmocom source --> squelch of some sort --> FM demod/ AM demod of sorts --> Audio sink If the squelch is set to stop the flow of samples as long as there's not enough signal, then downstream, the audio

Re: [Discuss-gnuradio] audio underrun when bad signal quality

2015-09-22 Thread Martin Braun
Do you have a sqelch anywhere in your flow graph? M On 22.09.2015 09:34, Markus Heller wrote: > Hi, > > playing around with my RTLSDR stick (RTL2832U / Rafael Micro R820T > tuner) I observed that whenever the reception (signal quality) is bad, I > am getting Audio Underruns and glitches in the a

[Discuss-gnuradio] audio underrun when bad signal quality

2015-09-22 Thread Markus Heller
Hi, playing around with my RTLSDR stick (RTL2832U / Rafael Micro R820T tuner) I observed that whenever the reception (signal quality) is bad, I am getting Audio Underruns and glitches in the accoustics. How can that happen? I always thought the sample rate was constant? When designing the sketch