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What does "time averaging" mean in reference to RF radiation exposure?
Which of the following is covered by the National Electrical Code?
Which of the following frequencies is within the General class portion of the 15-meter band?
Which of the following transmissions is permitted?
What is the maximum symbol rate permitted for RTTY or data emission transmission on the 20-meter band?
When must you add the special identifier "AG" after your call sign if you are a Technician class licensee and have a Certificate of Successful Completion of Examination (CSCE) for General class operator privileges, but the FCC has not yet posted your upgrade on its website?
The frequency allocations of which ITU region apply to radio amateurs operating in North and South America?
What is the recommended way to break in to a phone contact?
What is the voluntary band plan restriction for U.S. stations transmitting within the 48 contiguous states in the 50.1 to 50.125 MHz band segment?
What does the term "zero beat" mean in CW operation?
Which of the following describes an azimuthal projection map?
How can a PACTOR modem or controller be used to determine if the channel is in use by other PACTOR stations?
At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours?
What happens to HF propagation when the LUF exceeds the MUF?
What type of propagation allows signals to be heard in the transmitting station's skip zone?
What reading on the plate current meter of a vacuum tube RF power amplifier indicates correct adjustment of the plate tuning control?
What type of transmitter performance does a two-tone test analyze?
Why should soldered joints not be used with the wires that connect the base of a tower to a system of ground rods?
How much must the power output of a transmitter be raised to change the S meter reading on a distant receiver from S8 to S9?
Why is it best NOT to draw the DC power for a 100 watt HF transceiver from a vehicle's auxiliary power socket?
What is one reason to use an impedance matching transformer?
How many watts of electrical power are used if 400 VDC is supplied to an 800 ohm load?
If three equal value resistors in series produce 450 ohms, what is the value of each resistor?
Which of the following is an advantage of an electrolytic capacitor?
Which of these connector types is commonly used for RF connections at frequencies up to 150 MHz?
What useful feature does a power supply bleeder resistor provide?
Which of the following are basic components of a sine wave oscillator?
Which of the following is a typical application for a Direct Digital Synthesizer?
What is the name of the process that changes the phase angle of an RF signal to convey information?
What is the frequency deviation for a 12.21 MHz reactance modulated oscillator in a 5 kHz deviation, 146.52 MHz FM phone transmitter?
On what band do amateurs share channels with the unlicensed Wi-Fi service?
What must be done to prevent standing waves on an antenna feed line?
Where should the radial wires of a ground-mounted vertical antenna system be placed?
What is meant by the terms dBi and dBd when referring to antenna gain?
How does a "screwdriver" mobile antenna adjust its feed-point impedance?