What is frequency range of the localizer system?
A 108 – 117.95 MHz (odd 0.1 MHz)
B 108 – 117.95 MHz (even 0.1 MHz)
C 108.1 – 111.95 MHz (even 0.1 MHz)
D 108.1 – 111.95 MHz (odd 0.1 MHz)

Question

BlackTom AI · Accepted Answer

To tackle this question, I will evaluate the frequency ranges and the labeling convention for localizer systems step by step.
Option A: 'A 108 – 117.95 MHz (odd 0.1 MHz)'. This range spans from 108.0 up through 117.95, which is broader than the standard ILS localizer allocation. The localizer is limited to a portion of the 108–111.95 MHz band, not extending all the way to 117.95 MHz. Therefore, this option exaggerates the operational range.
Option B: 'B 108 – 117.95 MHz (even 0.1 MHz)'. Like Option A, the stated range covers 108 to 117.95 MHz, which is not the localizer’s actual span. Additionally, it specifies 'even 0.1 MHz' which conflicts with the standard convention for localizer channel spacing (see below). Overall, this is incorrect both in range and in the given spacing description.
Option C: 'C 108.1 – 111.95 MHz (even 0.1 MHz)'. The lower limit 108.1 MHz is within the general neighborhood of the localizer band, but the wording 'even 0.1 MHz' contradicts the standard channel labeling, which uses odd tenths for localizer frequencies. Also, the upper limit 111.95 MHz is correct for the upper end, but the incorrect odd/even designation makes this option unreliable.
Option D: 'D 108.1 – 111.95 MHz (odd 0.1 MHz)'. This aligns with the conventional ILS localizer allocation: the localizer uses frequencies starting at 108.1 MHz and continuing up to 111.95 MHz in steps of 0.1 MHz, with channel identifiers typically following an odd tenth of a MHz convention. The combination of the range and the odd-0.1 MHz labeling matches the standard practice for localizer frequencies.
In summary, the first three choices either overshoot the frequency range, or misstate the spacing convention (even vs odd tenths), or both. The fourth option correctly captures both the operational band (108.1 to 111.95 MHz) and the typical odd-0.1 MHz channel designation used for localizers, whereas the other options fail on one or more counts.

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What is frequency range of the localizer system? A 108 – 117.95 MHz (odd 0.1 MHz) B 108 – 117.95 MHz (even 0.1 MHz) C 108.1 – 111.95 MHz (even 0.1 MHz) D 108.1 – 111.95 MHz (odd 0.1 MHz)

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