The spike is very clean to come from outside. Must be from my X310. My tuner must be adding a signal to the center frequency. The small artifact at 2 Ghz is probably the tuner not equilibrating fully. I recently updated my FPGA image. Is that where the tuner lives?
On Fri, May 23, 2025 at 3:19 AM Nikos Balkanas <nbalka...@gmail.com> wrote: > Hello, > > Whenever I look at my spectrum I always see an energy spike at the center > frequency. > In the first image you can see a spike at 2, but not at 2.001 Ghz. In the > next image, > at 2.001 Ghz you can see the energy spike at the center frequency, but > also a small > spike at 2 Ghz. > I have verified these results by both fosphor (OpenCL fft) and fftw3f. > Besides, if it were > an fft artifact, why is the spike at 2 Ghz still visible after a few > mins? These spikes > seem to be transient, but real. In that part of the spectrum, you there > is no traffic. Could it be harmonics from my power supply? Problems with > my X-310? My transmitter > doing funny things (I have 2 boards and not enabling my transmitter > anywhere)? > Naming of images is freq_sr.jpg. All are in Mhz. > > TIA > Nikos >
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