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Re: [Discuss-gnuradio] [ Calculating the amplitude of a signal source ]

From: Ashish Raste
Subject: Re: [Discuss-gnuradio] [ Calculating the amplitude of a signal source ]
Date: Tue, 11 Dec 2012 12:09:17 +0800

Hi Nazmul,
Thanks for replying.

Change the Receiver gain and see if the strength/amplitude of the floating points change or not. If they do, then you are doing the right thing. You can place a signal calibrator (e.g. some variable attenuator) to calibrate the floating point strengths and actual received power.

I did notice significant change in the floating point values recorded when the gain was changed. Have attached the plots of those values for the gain values of 20 dB and 25 dB.

I also see that these values do not depict the sine wave (the source being a sine wave). So can I assume that these floats are not exactly the amplitudes but they have some relation to the amplitude of the signal? How can I calculate the amplitude from this recorded data (file_sink)?

Thanks and Regards,


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