Subelement B: Electrical Math— Topic 11: Frequency
Question 3-11B5
Element 3 (GROL)What is the most the actual transmitter frequency could differ from a reading of 156,520,000 Hertz on a frequency counter with a time base accuracy of +/- 10 ppm?
Explanation
Frequency counters derive their accuracy from their internal time base oscillator. A time base accuracy of +/- 10 ppm (parts per million) means that for every million units of the measured frequency, there could be an error of 10 units.
To calculate the maximum possible difference, multiply the measured frequency by the ppm error expressed as a fraction:
Error = Measured Frequency × (ppm / 1,000,000)
Error = 156,520,000 Hz × (10 / 1,000,000)
Error = 156,520,000 Hz × 0.000010
Error = 1565.20 Hz
Therefore, the actual transmitter frequency could differ from the reading by as much as 1565.20 Hz in either direction. This makes option B the correct answer. Options A, C, and D represent incorrect calculations or orders of magnitude.
Related Questions
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