Re: [Discuss-gnuradio] bladeRF - gr-osmosdr - gqrx - bandwidth?

[Ralph A. Schmid, dk5ras]

And as an addition, when trying to adjust the gain, I get these messages on
the console output:

Invalid LNA gain requested: 3.48, setting to LNA_MAX (6dB)
Invalid LNA gain requested: 3.66, setting to LNA_MAX (6dB)
Invalid LNA gain requested: 3.96, setting to LNA_MAX (6dB)
Invalid LNA gain requested: 4.14, setting to LNA_MAX (6dB)
Invalid LNA gain requested: 4.2, setting to LNA_MAX (6dB)
Invalid LNA gain requested: 4.26, setting to LNA_MAX (6dB)
Invalid LNA gain requested: 4.32, setting to LNA_MAX (6dB)
Invalid LNA gain requested: 4.38, setting to LNA_MAX (6dB)
Invalid LNA gain requested: 4.44, setting to LNA_MAX (6dB)
Invalid LNA gain requested: 4.5, setting to LNA_MAX (6dB)

> -----Original Message-----
> From: address@hidden [mailto:discuss-
> address@hidden On Behalf Of Ralph A. Schmid,
> dk5ras
> Sent: Saturday, 14 September, 2013 08:14
> To: 'Alexandru Csete'; 'Brian Padalino'
> Cc: 'GNURadio Discussion List'
> Subject: Re: [Discuss-gnuradio] bladeRF - gr-osmosdr - gqrx - bandwidth?
> 
> Hi,
> 
> > Hi Brian,
> >
> > I didn't think of these cases - they make sense.
> > I have added an option to set the bandwidth in the I/O configuration
> dialog. It is
> 
> Great!
> 
> > available in the git repository. I could test it with hackrf anbd I
> > hope
> somebody
> > else can test it with the bladerf.
> > Currently it does no checking - just passes the value directly to
> gr-osmosdr.
> 
> Just as an example, we have here three LTE carriers, and even with a few
cm of
> wire as antenna it is almost impossible to determine the three signals
here. It all
> mixes to a mush of signals. They are located as neighbor channels, 10 MHz
> spacing (796/806/816 MHz), 9 MHz bandwidth each. Also the GSM bands are
full
> of real and fake carriers what becomes visible when you have a look at the
band
> ends and see signals "off limits" that simply are not there. With the
USRP1 / WBX
> I only can see a part of this spectrum at a time, but almost without such
aliasing
> artifacts.
> 
> Otherwise, I like the little thing, seems reasonably sensitive even at
high
> frequencies (checked this with watching LTE2600 signals), just the lower
limit of
> 300 MHz is a bit ugly, down to 50 would be great :) Frequency is off 2ppm,
not
> good enough for hopefully (soon?) coming openbts support, but I guess some
> recalibration can fix it.
> 
> While writing this, I downloaded and compiled it. The filter itself works
great, I
> can see it from the noise floor, just the images are not gone, seems that
the RX
> simply is not as good as other SDRs. Anyway this is only a quick shot, I
will test it
> more thoroughly these days, with different combinations of sampling rate
and
> filter limits.
> 
> > Alex
> 
> Ralph.
> 
> 
> 
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio