General: Schottky Diode

Schottky diode

Which of the following is an advantage of using a Schottky diode in an RF switching circuit rather than a standard silicon diode? [G6A06] A. Lower capacitance B. Lower inductance C. Longer switching times D. Higher breakdown voltage First off, we need to know the difference between a Schottky diode and a standard silicon diode.  …

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General: QRV

What does the Q signal "QRV" mean?

What does the Q signal “QRV” mean? [G2C11] A. You are sending too fast B. There is interference on the frequency C. I am quitting for the day D. I am ready to receive messages Q-codes are one of those things you just have to memorize. There’s no good way around it.  I keep a …

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General: NVIS Height

At what height above ground is an NVIS antenna typically installed? [G9D03] A. As close to 1/2 wavelength as possible B. As close to one wavelength as possible C. Height is not critical as long as it is significantly more than 1/2 wavelength D. Between 1/10 and 1/4 wavelength First off, what the heck is …

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General: Overmodulation

Which of the following is an effect of overmodulation? [G8A08] A. Insufficient audio B. Insufficient bandwidth C. Frequency drift D. Excessive bandwidth The answer is D. Excessive bandwidth.  Now, for the purposes of getting this question correct on the exam, I’ll just say this: Just remember the connection between overmodulation and excessive bandwidth. The real …

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