Using a frequency counter with an accuracy...

Using a frequency counter with an accuracy...

Question 1 of 29218HcBYaySu0JRbsTej7M23

Using a frequency counter with an accuracy of 2 ppm — which of the following are within legal tolerance for the frequencies of 156.800 MHz and 156.525 MHz?

Question 1 of 29218

Q

Using a frequency counter with an accuracy of 2 ppm — which of the following are within legal tolerance for the frequencies of 156.800 MHz and 156.525 MHz?

🔍 Key Concepts

• Parts per million (ppm) as a way to express frequency tolerance • Converting MHz to kHz so all values are in the same units • Applying ±(ppm × carrier frequency) to find the allowed legal frequency range

💭 Think About

• What does 2 ppm mean in terms of how many kHz away from the assigned frequency is allowed at around 156 MHz? • Once you convert 156.800 MHz and 156.525 MHz to kHz, what are the minimum and maximum legal frequencies for each channel? • After you find those ranges, which answer choice has both measured frequencies inside their respective legal ranges?

✅ Before You Answer

• Be sure you correctly convert MHz to kHz before doing any ppm math • Carefully calculate 2 ppm of 156,800 kHz and 156,525 kHz and turn that into a ± tolerance in kHz • Confirm that both candidate frequencies in the choice fall within the allowed range for their respective channels, not just one of them