FREE Ham Radio Extra Class MCQ Questions and Answers

Question 1

Why should an amateur transmitter generally steer clear of 14.100, 18.110, 21.150, 24.930, and 28.200 MHz frequencies?

Accepted Answer

A system of propagation beacon stations operates on those frequencies

Answer

The frequencies 14.100, 18.110, 21.150, 24.930, and 28.200 MHz are internationally recognized as propagation beacon frequencies. These stations transmit continuous signals to allow amateur radio operators to assess current band conditions and determine which bands are open for long-distance communication. Transmitting on these frequencies would interfere with their essential function of providing vital propagation information to the amateur community.

Question 2

What does the sunspot number mean in terms of HF transmission?

Accepted Answer

Higher sunspot numbers generally indicate a greater probability of good propagation at higher frequencies

Answer

Sunspot numbers are a direct indicator of solar activity, which profoundly influences the Earth's ionosphere and, consequently, HF radio propagation. Higher sunspot numbers correspond to increased solar radiation, leading to a more highly ionized and denser F2 layer in the ionosphere. This enhanced ionization improves the ionosphere's ability to refract higher frequency radio waves back to Earth, resulting in better long-distance propagation on the higher HF bands.

Question 3

Which 80-meter band frequency is most frequently utilized for digital transmissions?

Accepted Answer

3570-3600 kHz

Answer

The frequency range of 3570-3600 kHz within the 80-meter band is widely recognized and utilized by amateur radio operators for various digital transmission modes. This segment is specifically designated for digital communications, including modes like FT8, PSK31, RTTY, and others. This allocation allows for efficient and organized digital activity without interfering with voice (SSB) or CW (Morse code) operations typically found elsewhere in the band.

Question 4

What function does the corona ball on an HF mobile antenna serve?

Accepted Answer

To reduce RF voltage discharge from the tip of the antenna while transmitting

Answer

On an HF mobile antenna, especially at higher power levels, the tip of the antenna can accumulate significant RF voltage. This high voltage can lead to corona discharge, where the air around the tip ionizes and glows, causing power loss and potential interference. The corona ball, a smooth, rounded sphere, helps to distribute this electric field more evenly, reducing the electric field gradient at the tip and thereby minimizing or preventing corona discharge.

Question 5

What does "QRV" in the Q signal mean?

Accepted Answer

I am ready to receive messages

Answer

"QRV" is a standard Q signal used in amateur radio and other radiocommunication. It is an abbreviation that means "Are you ready?" or "I am ready to receive messages." When an operator sends "QRV?", they are asking if the other station is ready, and when they send "QRV", they are indicating their own readiness to receive traffic.

HAM - Radio Extra Class Test Practice Test

HAM - Radio Extra Class Test Practice Test

FREE Ham Radio Extra Class MCQ Questions and Answers