E3B01

What is transequatorial propagation?

1. Propagation between two points at approximately the same distance north and south of the magnetic equator

E3B02

What is the approximate maximum range for signals using transequatorial propagation?

1. 5000 miles

E3B03

What is the best time of day for transequatorial propagation?

1. Afternoon or early evening

E3B04

What type of propagation is probably occurring if an HF beam antenna must be pointed in a direction 180 degrees away from a station to receive the strongest signals?

1. Long-path

E3B05

Which amateur bands typically support long-path propagation?

1. 160 to 10 meters

E3B06

Which of the following amateur bands most frequently provides long-path propagation?

1. 20 meters

E3B07

Which of the following could account for hearing an echo on the received signal of a distant station?

1. Receipt of a signal by more than one path

E3B08

What type of propagation is probably occurring if radio signals travel along the terminator between daylight and darkness?

1. Gray-line

E3B09

At what time of day is gray-line propagation most prevalent?

1. At sunrise and sunset

E3B10

What is the cause of gray-line propagation?

1. At twilight, solar absorption drops greatly, while atmospheric ionization is not weakened enough to reduce the MUF

E3B11

What communications are possible during gray-line propagation?

1. Contacts up to 8,000 to 10,000 miles on three or four HF bands

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