Ham Radio General Class Test FREE Ham Radio General Class Test Radio Wave Propagation Questions and Answers 3

Question 1

What is 'gray-line' propagation?

Accepted Answer

Propagation along the twilight zone between daylight and darkness on the Earth

Answer

Gray-line propagation occurs along the terminator (the boundary between day and night on Earth), where ionospheric conditions can enhance long-distance communication on lower HF bands.

Question 2

What causes multipath propagation distortion on HF signals?

Accepted Answer

Signals arriving via two or more different ionospheric paths with different delays

Answer

Multipath distortion occurs when the same signal arrives at the receiver via multiple ionospheric paths with different travel times, causing fading and signal distortion.

Question 3

What is Near Vertical Incidence Skywave (NVIS) propagation used for?

Accepted Answer

Reliable communication within a radius of approximately 0 to 300 miles

Answer

NVIS uses high-angle radiation to bounce signals off the ionosphere nearly straight down, providing reliable regional coverage out to roughly 300 miles with no skip zone.

Question 4

What is the 'skip zone' in HF propagation?

Accepted Answer

The area between the end of ground wave coverage and the beginning of skywave coverage where no signal is received

Answer

The skip zone is the region between where the ground wave fades out and where the first skywave return reaches the Earth, resulting in no usable signal.

Question 5

How does a geomagnetic storm typically affect HF radio propagation?

Accepted Answer

It can cause a complete blackout of HF communications, especially at high latitudes

Answer

Geomagnetic storms disturb the ionosphere and can cause partial or complete HF communication blackouts, with the most severe effects at higher latitudes.

Ham Radio General Class Test Practice Test

Ham Radio General Class Test Practice Test

Ham Radio General Class Test FREE Ham Radio General Class Test Radio Wave Propagation Questions and Answers 3