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I have a pic in the VLF band at 1.5 kHz. What would be the origin of this peak?

The graph was obtained by running display_qt in Linux from a laptop.

enter image description here

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    – rclocher3
    Commented Jan 5, 2017 at 18:59

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display_qt is a GNU Radio example program. It does not display any actually existing electromagnetic signal but internally generates a 1500 Hz sinusoid.

The code creates a sine source and a noise source,

// Source will be sine wave in noise
src0 = analog::sig_source_f::make(rate, analog::GR_SIN_WAVE, 1500, 1);
src1 = analog::noise_source_f::make(analog::GR_GAUSSIAN, 0.1);

then sums them and sends that to the displays.

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