Re: [Discuss-gnuradio] logging two channels using Ettus B210.

[Bidyut]

Thank you Michael and Marcus for your replies.

By CNO I meant signal to noise ratio.

Regards

Bidyut

On Wed, Oct 31, 2018, 3:09 PM Marcus Müller <address@hidden wrote:

Hi Bidyut,

Re: (1)
what's CNO?
Also, "Signal Voltage": your SDR device gives you something
*proportional* to signal voltage, but not an actual voltage. If you
need that, you'll have to calibrate for exactly your frequency/sampling
rate/bandwidth/cabling combination yourself.

1 S/s is not really what GNU Radio was meant for, but generally, you
can just decimate any signal as far as that's sensible Nyquist-wise.

Re: (2) Sounds like a 10-line python block you'll have to write, so not
hard at all!

You probably want to read the official GNU Radio tutorials. I don't
know what CNO is, but if it is simple to calculate, then these should
contain instructions for all you need to do:

https://tutorials.gnuradio.org

Best regards,
Marcus


On Tue, 2018-10-30 at 15:59 +0000, Bidyut Roy wrote:
>
> Hello,
>
> I am using the USRP Source block (set number of input channels to 2)
> to sense two signals, both at 250 MHz.  I have gnuradio companion on
> Ubuntu 16.04 OS on my laptop. I am using the UHD source block and
> using two channels.
>
> Now,
> (1) I need to plot CNO vs time, or Signal voltage vs time on each of
> the channels (pots RxA and RxB on the B210) at 1 sample per second (I
> want to keep it variable). The plots need to be generated in real-
> time.
> (2) I need to log the data generated in step (1) in ASCII format in a
> single file. The file should have the columns 'time', 'CNO (or signal
> voltage) on Channel 1' and 'CNO (or signal voltage) on Channel 2'.
>
> How can I achieve these using GNU radio companion on Ubuntu 16.04
> LTS? Please help.
>
> Regards,
> Bidyut
>
> Sent by Docsify
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