They skip the ham bands, like so many other services do. I used to work
with a vertically-incident ionosonde that scanned 2.0 through 30+ MHz. It
was programmed to skip the ham bands and the WWV frequencies. But it only
stayed on a given frequency for such a short time that I doubt it caused
any interference.

The HAARP facility also used frequency-scanning transmissions that skipped
over the ham bands.

Zack W9SZ

On Thu, Jul 20, 2023 at 9:22 PM Bill Smith <smth752@hotmail.com> wrote:

> According to the SMC the following 2-25 mhz frequency segments are in the
> Part 90 Industrial/Business pool: 2.107 – 2.170; 2.194 – 2.170; 2.505 –
> 2.850; 3.155 – 3.400; 4.000 – 4.063; 4.438 – 4.650; 4.750 – 4.995; 5.005 –
> 5.450; 5.730 – 5.900; 5.730 – 5.900; 6.765 – 7.000; 7.400 – 8.100; 9.040 –
> 9.400; 9.900 – 9.995; 10.150 – 11.175; 11.400 – 11.600; 12.100 – 12.230;
> 13.410 – 13.570; 13.870 – 14.000; 15.800 -16.360; 17.410 – 17.480; 18.030 –
> 18.068; 18.168 – 18.780; 19.020 – 19.680; 19.800 – 19.990; 20.010 – 21.000;
> 21.850 – 21.924; 22.855 – 23.200; 23.350 – 24890. There might be a typo,
> but you can check Appendix E, page 35 of the document. SMC stations have
> been testing on 4.9, 10.2, 14.9, 19.9 and 24.8 mhz respectively for several
> years using experimental call signs: WI2XNX, WI2XER, WI2XAJ, WL2XYM, and
> WM2XTS. Bill Smith, Douglas, MA
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows
>
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