Gmdss_e3 : Element 3 - 450/605
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| How is a frequency counter used? |
| A) To provide reference points on an analog receiver dial thereby aiding in the alignment of the receiver. |
| B) To heterodyne the frequency being measured with a known variable frequency oscillator until zero beat is achieved, thereby indicating the unknown frequency. |
| C) To measure the deviation in an FM transmitter in order to determine the percentage of modulation. |
| D) To measure the time between events, or the frequency, which is the reciprocal of the time. |
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