Learn Amateur Radio!
What type of electrical component consists of two or more conductive surfaces separated by an insulator?* A. ResistorB. PotentiometerC. OscillatorD. Capacitor Well, I guess I gave it away in the post title. Yes, the answer is D. Capacitor. But what exactly is going on here? A capacitor is a device that has the “capacity” (get …
What is one advantage of using ASCII code for data communications? A. It includes built in error correction featuresB. It contains fewer information bits per character than any other codeC. It is possible to transmit both upper and lower case textD. It uses one character as a shift code to send numeric and special characters …
What is a use for an antenna analyzer other than measuring the SWR of an antenna system? A. Measuring the front to back ratio of an antennaB. Measuring the turns ratio of a power transformerC. Determining the impedance of an unknown or unmarked coaxial cableD. Determining the gain of a directional antenna Well, you’re not …
What is the current flowing through a 24-ohm resistor connected across 240 volts? [T5D09] A. 24,000 amperes B. 0.1 amperes C. 10 amperes D. 216 amperes Get out your calculators, because this is a cut-and-dried case of needing to use Ohm’s law. Ohm’s law defines the relationship beteween voltage, current, and resistance in a circuit. …
What is the peak-inverse-voltage across the rectifier in a half-wave power supply? [G7A04] A. One-half the normal peak output voltage of the power supply B. One-half the normal output voltage of the power supply C. Equal to the normal output voltage of the power supply D. Two times the normal peak output voltage of the …
What information is traditionally contained in a station log? [G2D09] A. Date and time of contact B. Band and/or frequency of the contact C. Call sign of station contacted and the signal report given D. All of these choices are correct When keeping logs for your station, you need certain pieces of information for the …
Which of the following electronic components can amplify signals? [T6B05] A. Transistor B. Variable resistor C. Electrolytic capacitor D. Multi-cell battery The answer is, as luck would have it, A. Transistor. The transistor is probably the miracle of 20th century technology. It’s an amplifier, a switch, and so much more. None of the other components …
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 I know what you’re thinking. Where did this bit of word soup come from, right? First off, …
What is the ability to store energy in an electric field called? [T5C01] A. Inductance B. Resistance C. Tolerance D. Capacitance Hate to say it, but this is basically a definition question. The answer is D. Capacitance. The easy way to remember this is just think about capacitors, the devices that actually store the electric …
Within what distance must an amateur station protect an FCC monitoring facility from harmful interference? A. 1 mileB. 3 milesC. 10 milesD. 30 miles The answer is: A. 1 mile. Why? Because the FCC has said so, basically. In section 13 of Part 97. (b) A station within 1600 m (1 mile) of an FCC …