Logging in (or registering) will help the system to select questions that you need to focus on.
Which of the following frequencies is within the General Class portion of the 20-meter phone band?
When is an amateur station permitted to transmit secret codes?
Which of the following limitations apply to transmitter power on every amateur band?
When must you add the special identifier "AG" after your call sign if you are a Technician Class licensee and have a CSCE for General Class operator privileges, but the FCC has not yet posted your upgrade on its website ?
What types of messages for a third party in another country may be transmitted by an amateur station?
What does the expression "CQ DX" usually indicate?
What frequency should be used to send a distress call?
What does the term "zero beat" mean in CW operation?
How is a directional antenna pointed when making a "long-path" contact with another station?
What could be wrong if you cannot decode an RTTY or other FSK signal even though it is apparently tuned in properly?
What effect does a high sunspot number have on radio communications?
What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the F2 region?
What makes HF scatter signals often sound distorted?
What is a reason to use Automatic Level Control (ALC) with an RF power amplifier?
Which of the following is the best instrument to use when checking the keying waveform of a CW transmitter?
Which of the following could be a cause of interference covering a wide range of frequencies?
Which of the following can be the result of an incorrectly adjusted speech processor?
Which of the following may cause interference to be heard in the receiver of an HF radio installed in a recent model vehicle?
What is one reason to use an impedance matching transformer?
What dB change represents a two-times increase or decrease in power?
What happens if you reverse the primary and secondary windings of a 4:1 voltage step down transformer?
What is the approximate junction threshold voltage of a germanium diode?
Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?
What portion of the AC cycle is converted to DC by a half-wave rectifier?
How many states does a 3-bit binary counter have?
What should be the impedance of a low-pass filter as compared to the impedance of the transmission line into which it is inserted?
What is the modulation envelope of an AM signal?
What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?
How does the receiving station respond to an ARQ data mode packet containing errors?
What must be done to prevent standing waves on an antenna feed line?
How does the feed point impedance of a 1/2 wave dipole antenna change as the antenna is lowered below 1/4 wave above ground?
What happens when the feed point of a quad antenna of any shape is moved from the midpoint of the top or bottom to the midpoint of either side?
Which of the following is an advantage of an NVIS antenna?
What is one thing that can be done if evaluation shows that a neighbor might receive more than the allowable limit of RF exposure from the main lobe of a directional antenna?
Which of the following conditions will cause a Ground Fault Circuit Interrupter (GFCI) to disconnect the 120 or 240 Volt AC line power to a device?