Logging in (or registering) will help the system to select questions that you need to focus on.
What is the primary function of an external earth connection or ground rod?
If an amateur station is installed aboard a ship or aircraft, what condition must be met before the station is operated?
To what type of regulations does PRB-1 apply?
Which of the following operating arrangements allows an FCC-licensed U.S. citizen to operate in many European countries, and alien amateurs from many European countries to operate in the U.S.?
Which UHF amateur bands have frequencies authorized for space stations?
What should a VE do if a candidate fails to comply with the examiner's instructions during an amateur operator license examination?
Which of the following geographic descriptions approximately describes "Line A"?
Why should effective radiated power to a satellite that uses a linear transponder be limited?
What is vestigial sideband modulation?
What indicator is required to be used by U.S.-licensed operators when operating a station via remote control and the remote transmitter is located in the U.S.?
Which of the following is a good technique for making meteor scatter contacts?
What is the most common data rate used for HF packet?
What is the cause of auroral activity?
What is the primary characteristic of chordal hop propagation?
What orientation of Bz (B sub z) increases the likelihood that incoming particles from the sun will cause disturbed conditions?
How is the compensation of an oscilloscope probe typically adjusted?
Which of the following factors most affects the accuracy of a frequency counter?
A CW receiver with the AGC off has an equivalent input noise power density of -174 dBm/Hz. What would be the level of an unmodulated carrier input to this receiver that would yield an audio output SNR of 0 dB in a 400 Hz noise bandwidth?
How can intermodulation interference between two repeaters occur?
What problem can occur when using an automatic notch filter (ANF) to remove interfering carriers while receiving CW signals?
What is the magnitude of the circulating current within the components of a parallel LC circuit at resonance?
What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors, all in parallel?
What coordinate system is often used to display the resistive, inductive, and/or capacitive reactance components of impedance?
What is reactive power?
How does DC input impedance at the gate of a field-effect transistor compare with the DC input impedance of a bipolar transistor?
What characteristic of a PIN diode makes it useful as an RF switch?
Which of the following is an advantage of BiCMOS logic?
What is one reason for using powdered-iron cores rather than ferrite cores in an inductor?
Why is gallium arsenide (GaAs) useful for semiconductor devices operating at UHF and higher frequencies?
What happens to the conductivity of a photoconductive material when light shines on it?
What logical operation is performed by an exclusive NOR gate?
How can an RF power amplifier be neutralized?
How does an impedance-matching circuit transform a complex impedance to a resistive impedance?
What is the purpose of connecting equal-value resistors across power supply filter capacitors connected in series?
Why is de-emphasis commonly used in FM communications receivers?
How frequently must an analog signal be sampled by an analog-to-digital converter so that the signal can be accurately reproduced?
What absolute voltage gain can be expected from the circuit in Figure E7-3 when R1 is 3300 ohms and RF is 47 kilohms?
What type of frequency synthesizer circuit uses a phase accumulator, lookup table, digital to analog converter, and a low-pass anti-alias filter?
What is "dither" with respect to analog-to-digital converters?
Orthogonal Frequency Division Multiplexing is a technique used for which type of amateur communication?
What is the relationship between symbol rate and baud?
What is a common cause of overmodulation of AFSK signals?
What is antenna bandwidth?
What is a disadvantage of decreasing the number of wire segments in an antenna model below 10 segments per half-wavelength?
What is the effect of adding a terminating resistor to a rhombic antenna?
Why should an HF mobile antenna loading coil have a high ratio of reactance to resistance?
What is the purpose of the series capacitor in a gamma-type antenna matching network?
What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically 1/2 wavelength long at 14.10 MHz?
Which of the following can be calculated using a Smith chart?
What is the triangulation method of direction finding?