Re: [gqrx] I/Q recorder tool can't record if input rate <1Msps

[Alexandru Csete]

Well, the error comes from the gr-iio / plutosdr library and IQ
recording at low rates seems to work well using the rtl-sdr dongle, so
I am not convinced the error is in gqrx.

You can try using higher rate and enable input decimation.

I will see if there are any updates next tie Ipackage, but it comes
with three different libraries so it's a pain to package :-(

Alex



On Thu, Jan 4, 2018 at 6:57 PM, Gérald <gb....@bastelica.net> wrote:
> Hi,
>
> It seems there's some kind of bug with I/Q recorder tool.
>
> If i configure my SDR device with input rate <1Msps (for example 900 ksps),
> and if i try to record raw I/Q to file, as soon as i click "Rec", the
> panadapter view freezes, the waterfall view continue to move but with
> constant/frozen signal, the demodulated audio goes silent, and an error
> message is displayed in the terminal:
> thread[thread-per-block[0]: <block fmcomms2_source (49)>]: Unable to create
> buffer!
>
> As soon as i stop recording, everything comes back to life, but the created
> file is 0 byte.
>
> Input rate >= 1Msps is OK.
>
> Ubuntu 17.10 x64
> GQRX 2.9 installed as instructed by http://gqrx.dk/download/install-ubuntu
> Pluto SDR FW 0.26
>
> Regards,
> Gérald
>
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