1
$\begingroup$

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

$\endgroup$
  • $\begingroup$ Hi, and welcome to ham.stackexchange.com! We recommend all new users take the tour to get the most from the site. $\endgroup$ – rclocher3 Jan 5 '17 at 18:59
3
$\begingroup$

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.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.