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Re: [Discuss-gnuradio] Cannot run FM radio either

From: West, Nathan
Subject: Re: [Discuss-gnuradio] Cannot run FM radio either
Date: Tue, 10 May 2016 23:18:32 -0400

Keep track of your sampling rates.

Input is 5e6. Filter decimates to 1e6. Rational resampler goes to 2.4e6, then you've told the wbfm rx to expect input at 480e3. In the rational resampler try setting interpolation to 480e3 and decimation to 1e6.

Hopefully that gets you some sound. By the way, where is this tutorial? Can you provide a link?


On Tue, May 10, 2016 at 10:04 PM, Vinit Shah <address@hidden> wrote:
Well, Thank you for pointing that out.. but still without multiply block I still have trouble with listening to music on FM radio..
Now I can see the peaks where there are stations but still all I here isĀ  noise in my output..
Any suggestions would be highly appreciable

On Tue, May 10, 2016 at 5:48 PM, West, Nathan <address@hidden> wrote:
You're misunderstanding sampling. A couple of things:

1) Your signal source has a "sampling frequency" of 5MHz and you are asking it to generate a cosine with frequency 96.5 MHz. If you've had a DSP or linear systems class thing back to nyquist (damn kentucky derby means googling for nyquist is now full of horses)
2) Let's say you tune the USRP to 96.5MHz and there's a station there. What do you expect the received spectrum to look like? For a hint look up complex baseband.

Also, it helps people help you if you explain what you expected and what actually happened.

On Tue, May 10, 2016 at 4:50 PM, Vinit Shah <address@hidden> wrote:
I have been trying to run basic FM radio tutorial using USRP n200 but I cannot even do that. Attached is the png file of my flow graph, I do not understand what is wrong here.

I also tried to check spectrum usingĀ  waterfall sink but no significant results
Please guide me here.

-Vinit Shah

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