Which frequency category is considered high frequency?

Prepare for the NGA 21 Locating and Marking of Facilities Test with our study material, flashcards, and multiple-choice questions that offer hints and detailed explanations. Get ready to succeed in your certification!

Multiple Choice

Which frequency category is considered high frequency?

Explanation:
In locating and marking facilities, signals used for locating are grouped into frequency categories to indicate how they behave and what equipment is best suited to detect them. High frequency here refers to signals well above ordinary power or audio ranges, providing the higher frequency band used for certain locating tools. The standard power-line frequencies, 50 Hz and 60 Hz, are very low in the spectrum and are not considered high frequency. An audio-range frequency like 1 kHz is still not in the high-frequency category used for these locating methods. Signals at 65 kHz and above sit in the high-frequency range, which is why that option is the correct choice.

In locating and marking facilities, signals used for locating are grouped into frequency categories to indicate how they behave and what equipment is best suited to detect them. High frequency here refers to signals well above ordinary power or audio ranges, providing the higher frequency band used for certain locating tools. The standard power-line frequencies, 50 Hz and 60 Hz, are very low in the spectrum and are not considered high frequency. An audio-range frequency like 1 kHz is still not in the high-frequency category used for these locating methods. Signals at 65 kHz and above sit in the high-frequency range, which is why that option is the correct choice.

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