Current Ham Radio Test Pools
Select the most correct answer for each question, then submit your practice test to check your score. This practice test randomly pulls one question from each topic in the Amateur Extra pool.
What is the effective radiated power relative to a dipole of a repeater station with 200 watts transmitter power output, 4 dB feed line loss, 3.2 dB duplexer loss, 0.8 dB circulator loss, and 10 dBd antenna gain?
Why are high-power RF amplifier ICs and transistors sometimes mounted in ceramic packages?
What do the terms L band and S band specify with regard to satellite communications?
Which of the following is a significant difference between foam dielectric coaxial cable and solid dielectric cable, assuming all other parameters are the same?
Which point on Figure E5-2 best represents the impedance of a series circuit consisting of a 300 ohm resistor and a 19 picofarad capacitor at 21.200 MHz?
What characterizes libration fading of an EME signal?
What is the maximum permissible duration of a remotely controlled station's transmissions if its control link malfunctions?
What is the equation for calculating power dissipation by a series connected linear voltage regulator?
How much power is consumed in a circuit consisting of a 100 ohm resistor in series with a 100 ohm inductive reactance drawing 1 ampere?
Which of the following describes a method to measure intermodulation distortion in an SSB transmitter?
What is susceptance?
How does the radiation pattern of a horizontally polarized 3-element beam antenna vary with its height above ground?
What is one common use for PIN diodes?
Which of the following choices is a good reason for selecting a high frequency for the design of the IF in a conventional HF or VHF communications receiver?
Which of the following is a good technique for making meteor scatter contacts?
Which of the following is a likely result when a Class C amplifier is used to amplify a single-sideband phone signal?
What is an effective way of matching a feed line to a VHF or UHF antenna when the impedances of both the antenna and feed line are unknown?
Why might a DX station state that they are listening on another frequency?
Which type of control is used by stations using the Automatic Link Enable (ALE) protocol?
What may be the penalty for a VE who fraudulently administers or certifies an examination?
What is the equivalent circuit of a quartz crystal?
What is an advantage of using a shielded loop antenna for direction finding?
What information is contained in the lookup table of a direct digital frequency synthesizer?
Which of the following is the common name for a filter network which is equivalent to two L-networks connected back-to-back with the two inductors in series and the capacitors in shunt at the input and output?
What is meant by the term baseband in radio communications?
Which of the following is a common method of transmitting accompanying audio with amateur fast-scan television?
What is resonance in an electrical circuit?
What type of wave has a rise time significantly faster than its fall time (or vice versa)?
What is the primary advantage of tri-state logic?
Which of the following is the most appropriate use of an op-amp active filter?
What type of coordinate system is used in a Smith chart?
In Figure E6-2, what is the schematic symbol for an N-channel dual-gate MOSFET?
Which of the following describes two problems caused by poor dynamic range in a communications receiver?
Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?
What logical operation does an OR gate perform?
Which is the most likely cause if you are hearing combinations of local AM broadcast signals within one or more of the MF or HF ham bands?
What is the cause of gray-line propagation?
Which of the following would provide the best RF ground for your station?
Which amateur stations are eligible to operate as Earth stations?
What is the elevation angle of peak response in the antenna radiation pattern shown in Figure E9-2?
What is a solid state relay?
What is the most common method of reducing key clicks?
If a station in a message forwarding system inadvertently forwards a message that is in violation of FCC rules, who is primarily accountable for the rules violation?
Which of the following would be a practical way to estimate whether the RF fields produced by an amateur radio station are within permissible MPE limits?
What is the necessary bandwidth of a 170-hertz shift, 300-baud ASCII transmission?
What must be done before placing an amateur station within an officially designated wilderness area or wildlife preserve, or an area listed in the National Register of Historical Places?
What describes Orthogonal Frequency Division Multiplexing?
What aspect of receiver analog-to-digital conversion determines the maximum receive bandwidth of a Direct Digital Conversion SDR?
What does the 304A solar parameter measure?
What is the purpose of the prescaler function on a frequency counter?