Help : I am trying to know the grc

GNU Radio
1

Hi guys ,
First of all i m a newbie in this field and please do tolerate any
stupid
question from my side , rather please guide me .
I am attaching my most simple grc block design and it seems something is
wrong so the build/run button is deact
ivated. and if i remove the fft block i can run my application. What i
am
trying to do is to show the noise to the fft or any other form.
Hoping some one will guide me …
Thanks

2

Hi
I built the same blocks and it worked. When the block title is in red it
means their is a problem with one of the parameters. It’s not a
parameter like sample_rate otherwise it would also be red, I would
delete the FFT block and create a new one and try that without changing
any parameters.

David

3

On 03/16/2011 12:35 PM, anil ph wrote:

The FFT sink is red, but you didnt tell us the error. -Josh

4

On 18-03-11 06:51, anil ph wrote:

I tried to make changes in sampling rate to 41000khz and 48000khz but i

Thats hz i presume? Like 41Khz and 48Khz?

could not get output. My concern is trying to learn gnuradio working
using no hardware as i dnt have any hardware but trying to learn some of
the basic things from my laptop , i m working on lucid ubuntu on dell
N4010 , can you please suggest me a simplel way to execute my fft using
grc as now i m trying with signal source as well as audio source.
Thanks for concern.

Did you include the throttle component? You could have stayed on 32Khz.
If you use the ‘pulse’ device in the audio sink. then it integrates with
the ubuntu sound system.

Gr. Sim

5

Hi i am uploading a snapshot of a simple design which is giving me
problem
…

6

Try (100,100) for window size

Kind regards,
Yahia Tachwali

From: discuss-gnuradio-bounces+ytachwali=removed_email_address@domain.invalid
[discuss-gnuradio-bounces+ytachwali=removed_email_address@domain.invalid] on behalf of anil ph
[[email protected]]
Sent: Friday, March 18, 2011 12:18 PM
To: [email protected]; [email protected]
Subject: Re: [Discuss-gnuradio] Help : I am trying to know the grc.

Hi i am uploading a snapshot of a simple design which is giving me
problem …

On Fri, Mar 18, 2011 at 10:37 PM, anil ph
<[email protected]mailto:[email protected]> wrote:
yes , there is some problem i suppose which i may have set in the
parameters … but as due to lack of knowledge i am not able to figure
out
what the problem could be. What i want to run is a simple hello world
program/design using FFT or any other graphical components. And
unfortunately
i dont have usrp or any other hardware. what i want to experiment now is
with my simple laptop .

Thanks all for the kindness and concern shown to the newbie in this
forum.

On Fri, Mar 18, 2011 at 8:19 PM, Josh B.
<[email protected]mailto:[email protected]> wrote:

On 03/16/2011 12:35 PM, anil ph wrote:

The FFT sink is red, but you didnt tell us the error. -Josh

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7

Thanks tachwali … it works out and very much thankful to you all …

8

On 18-03-11 23:40, Tachwali, Yahia wrote:

Try (100,100) for window size

Kind regards,
Yahia Tachwali

Is the trick here, to reduce the cpu load by decreasing the size of the
window?

Gr. Sim

9

On Sat, Mar 19, 2011 at 12:00 PM, Sim IJskes [email protected] wrote:

On 18-03-11 23:40, Tachwali, Yahia wrote:

Try (100,100) for window size

Kind regards,
Yahia Tachwali

Is the trick here, to reduce the cpu load by decreasing the size of the
window?

If the hardware provides even just basic graphics acceleration the
window size will not have much effect on CPU load.
Reducing the FFT size and the frame rate often helps reducing CPU load.

Alex