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What's causing these horizontal bands of noise?

It's the middle of the day here in a low density city neighborhood. They were not present about 20 minutes ago; now they are even stronger and filling in the space between the lines.

  • Cannot hear any lawnmowers or other engine equipment, very quiet outside.
  • Shut off all the power to the house, ran off a battery, still see the same thing.

How do I figure out what these horizontal lines are?

IC-7300 spectrum with periodic wideband noise.

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  • $\begingroup$ Welcome to this site, and thanks for a great first question. Could you make an audio recording of this for us? $\endgroup$ – Mike Waters Jan 4 at 21:06
  • $\begingroup$ This is a very wideband signal. Is this present outside the 20m band? If so, how low and how high in frequency can you go and still hear it? $\endgroup$ – Mike Waters Jan 4 at 21:10
  • $\begingroup$ My guess is that it is over-the-horizon radar. If you have a rotatable beam, from what direction in respect to your QTH is it coming from? Russia? $\endgroup$ – Mike Waters Jan 4 at 21:13
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    $\begingroup$ what is the time between these wideband bursts? $\endgroup$ – Marcus Müller Jan 5 at 14:38

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