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Which of the following is referred to as the upper section of HF?

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Which of the following is referred to as the upper section of HF?

(a) 26.5 MHz to 30 MHz

(b) 26.5 Hz to 30 Hz

(c) 265 MHz to 300 MHz

(d) 265 Hz to 300 Hz

I have been asked this question in semester exam.

My query is from Radio Shop topic in section Radio Shop of Aircraft Maintenance

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Right option is (a) 26.5 MHz to 30 MHz

For explanation: The upper section of high frequency range refers to frequencies having a magnitude between 26.5 MHz and 30 MHz. Frequencies from this section possess characteristics similar to frequencies in the lower part of VHF.

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