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Subelement B
Electrical Math
Section 11
Frequency
What is the most the actual transmit frequency could differ from a reading of 462,100,000 Hertz on a frequency counter with a time base accuracy of ± 0.1 ppm?
46.21 Hz.
• 0.1 MHz.
• 462.1 Hz.
• 0.2 MHz.

What is the most the actual transmit frequency could differ from a reading of 462,100,000 Hertz on a frequency counter with a time base accuracy of ± 0.1 ppm?

46.21 Hz

From hamingitup:

461,100,000Hz = 4.611x108 Hz

0.1 ppm = 0.1 (parts/million) =
0.1 / 1,000,000 =
10-1 / 106 = 10-7

Freq ∗ ppm = +/- difference

4.611x108 ∗ 10-7 = 46.21

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The second harmonic of a 380 kHz frequency is:
• 2 MHz.
760 kHz.
• 190 kHz.
• 144.4 GHz.

The second harmonic of a 380 kHz frequency is:

760 kHz.

From wp2ahg:

Harmonics ♬ have frequencies of 2f, 3f, 4f, etc.

So, the second harmonic is 2f, or
$(2) ∗ (380 \text{ kHz}) = 760 \text{ kHz}$.

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What is the second harmonic of SSB frequency 4146 kHz?
8292 kHz.
• 4.146 MHz.
• 2073 kHz.
• 12438 kHz.

What is the second harmonic of SSB frequency 4,146 kHz?

8,292 kHz.

From wp2ahg:

Harmonics ♬ have frequencies of 2f, 3f, 4f, etc.

So, the second harmonic is 2f, or

$(2) ∗ (4,146 \text{ kHz}) = 8,292 \text{ kHz}$.

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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 ± 1.0 ppm?
• 165.2 Hz.
• 15.652 kHz.
156.52 Hz.
• 1.4652 MHz.

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 ± 1.0 ppm?

156.52 Hz

From wp2ahg:

156,520,000 Hz ∗ (1 / 1,000,000) = 156.52 Hz

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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?
• 146.52 Hz.
1565.20 Hz.
• 10 Hz.
• 156.52 kHz.

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?

1,565.20 Hz

From wp2ahg:

156,520,000 Hz ∗ (10 / 1,000,000) = 1,565.20 Hz

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What is the most the actual transmitter frequency could differ from a reading of 462,100,000 hertz on a frequency counter with a time base accuracy of ± 1.0 ppm?
• 46.21 MHz.
• 10 Hz.
• 1.0 MHz.