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. 2022 Jun 14;11:651. [Version 1] doi: 10.12688/f1000research.111170.1

Figure 2. Spectrograms comparing the Avisoft and PULSE systems in relation to operation of walkie-talkie radios.

Figure 2.

A) The Avisoft system detected a multi component frequency modulated noise centred at approximately 50 kHz and 100 kHz. B) The PULSE system did not detect any noise at 100 kHz. The red boxes in (A) and (B) highlight comparable frequency ranges in each spectrogram. Whilst the PULSE system did measure a low-level noise in this range, it is likely related to harmonics of the higher-level audible beep in the 1–7 kHz range.