Re: [Discuss-gnuradio] how to tune the agc2 parameters?

[Mike Jameson]

Make sure you include a throttle block just after the file source to prevent the CPU maxing out.

Mike

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Mike Jameson M0MIK BSc MIET
Ettus Research Technical Support
Email: address@hidden
Web: http://ettus.com

On Mon, May 19, 2014 at 3:43 PM, Mike Jameson <address@hidden> wrote:

You forgot to attach the GRC file.

Mike

--
Mike Jameson M0MIK BSc MIET
Ettus Research Technical Support
Email: address@hidden
Web: http://ettus.com

On Mon, May 19, 2014 at 3:36 PM, Pengyu Zhang <address@hidden> wrote:

Attached is the source signal. It is recorded in a file. I plotted the output signal of AGC using Matlab. Now I'm using the GRC to tune the AGC parameters and try to figure a group of parameters that work. Let me know if you find something interesting. Thanks.

On Mon, May 19, 2014 at 8:40 AM, Mike Jameson <address@hidden> wrote:

If you attach your GRC file I'll see if I can reproduce it at my end.  From the image I assume you are using the QT scope.  Have you tried with the WX scope?

Mike

--
Mike Jameson M0MIK BSc MIET
Ettus Research Technical Support
Email: address@hidden
Web: http://ettus.com

On Mon, May 19, 2014 at 1:27 PM, Pengyu Zhang <address@hidden> wrote:

I tried the Feed Forward AGC with number of samples set to 1024. The signal output by the AGC is shown below. The first issue of the AGC is that each pulse (shown by the rectangle) is converted to multiple samples with high and low amplitude. Why is it the case? How to tune the AGC so that it does not change the shape of the signal?

On Mon, May 19, 2014 at 2:35 AM, Mike Jameson <address@hidden> wrote:

I've found that the "Feed Forward AGC" block with number of samples set to 1024 works best for me.

Mike

--
Mike Jameson M0MIK BSc MIET
Ettus Research Technical Support
Email: address@hidden
Web: http://ettus.com

On Sun, May 18, 2014 at 10:00 PM, Pengyu Zhang <address@hidden> wrote:

Hi,

I want to use agc to control the power of received signal. The received signal is shown below.

Then I used gr.agc2_cc(0.3, 1e-3, 1, 1, 100) to tune the power of received signal. The output of agc is crappy as shown below. I tried several parameters of agc and none of them works. Any suggestion on how to tune the agc parameters? Thanks.

Pengyu

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