11. Another application of spiral antennas is monitoring of the frequency spectrum . 12. Another approach to demographic inference relies on the allele frequency spectrum . 13. The International Telecommunication Union ( ITU ) helps managing the radio-frequency spectrum internationally. 14. The components of the trombone's frequency spectrum was derived through a Fourier transform. 15. Dually, a discrete-time signal gives rise to a periodic frequency spectrum . 16. Combined, these natural phenomena create strong MT source signals over the entire frequency spectrum . 17. The sale of radio frequency spectrums could bring another $ 2 . 1 billion. 18. Varying the time delay causes these to sweep up and down the frequency spectrum . 19. The network operates in the license-exempt 2.4 GHz frequency spectrum . 20. Licenses are also required for radio frequency spectrum , except for very low power devices.
