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What precaution should you take if you install an indoor transmitting antenna?
What should be done by any person preparing to climb a tower that supports electrically powered devices?
Which of the following may apply in areas under FCC jurisdiction outside of ITU Region 2?
When is it permissible to communicate with amateur stations in countries outside the areas administered by the Federal Communications Commission?
What is the maximum symbol rate permitted for RTTY or data emission transmitted on the 1.25-meter and 70-centimeter bands?
What is the minimum age that one must be to qualify as an accredited Volunteer Examiner?
Why should an amateur operator normally avoid transmitting on 14.100, 18.110, 21.150, 24. 930 and 28.200 MHz?
Which of the following is most commonly used for SSB voice communications in the VHF and UHF bands?
Which of the following is true concerning access to frequencies?
When sending CW, what does a "C" mean when added to the RST report?
Which of the following is required when participating in a contest on HF frequencies?
Which communication system sometimes uses the internet to transfer messages?
How long does it take charged particles from coronal mass ejections to affect radio propagation on Earth?
What is a reliable way to determine if the MUF is high enough to support skip propagation between your station and a distant location on frequencies between 14 and 30 MHz?
Why is long-distance communication on the 40-meter, 60-meter, 80-meter, and 160-meter bands more difficult during the day?
What is a reason to use Automatic Level Control (ALC) with an RF power amplifier?
What item of test equipment contains horizontal and vertical channel amplifiers?
Which of the following might be useful in reducing RF interference to audio frequency devices?
What frequency range is occupied by a 3 kHz USB signal with the displayed carrier frequency set to 14.347 MHz?
What is one disadvantage of using a shortened mobile antenna as opposed to a full-size antenna?
What unit is used to measure reactance?
What value of an AC signal produces the same power dissipation in a resistor as a DC voltage of the same value?
Which of the following components increases the total resistance of a resistor?
What is the minimum allowable discharge voltage for maximum life of a standard 12 volt lead-acid battery?
Which of these connector types is commonly used for audio signals in Amateur Radio stations?
What portion of the AC cycle is converted to DC by a half-wave rectifier?
Which of the following are basic components of a sine wave oscillator?
Which of the following is an advantage of a direct digital synthesizer (DDS)?
What is the name of the process that changes the phase angle of an RF signal to convey information?
What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?
Which digital mode is used as a low-power beacon for assessing HF propagation?
What are the typical characteristic impedances of coaxial cables used for antenna feed lines at amateur stations?
Which of the following is an advantage of a horizontally polarized as compared to a vertically polarized HF antenna?
How does the gain of two three-element, horizontally polarized Yagi antennas spaced vertically 1/2 wavelength apart typically compare to the gain of a single three-element Yagi?
In which direction or directions does an electrically small loop (less than 1/3 wavelength in circumference) have nulls in its radiation pattern?