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Amateur Extra: Crystal Oscillator Frequency

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Which of the following must be done to insure that a crystal oscillator provides the frequency specified by the crystal manufacturer? A. Provide the crystal with a specified parallel inductanceB. Provide the crystal with a specified parallel capacitanceC. Bias the crystal at a specified voltageD. Bias the crystal at a specified current Hm. A crystal …

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Amateur Extra: Sporadic E Propagation

Sporadic E Propagation

At what time of year is Sporadic E propagation most likely to occur? A. Around the solstices, especially the summer solsticeB. Around the solstices, especially the winter solsticeC. Around the equinoxes, especially the spring equinoxD. Around the equinoxes, especially the fall equinox Sporadic E Propagation refers to the phenomena where radio signals bounce off of …

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Amateur Extra: Gray Code

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What is an advantage of Gray code in digital communications where symbols are transmitted as multiple bits A. It increases security B. It has more possible states than simple binary C. It has more resolution than simple binary D. It facilitates error detection Firstly, what the heck is “Gray code” anyway? The reflected binary code …

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