ARRL Vocabulary Development 3

Question 1

What does 'modulation' mean in radio communications?

Accepted Answer

Varying a carrier wave to encode information

Answer

Modulation is the process of varying a carrier wave's amplitude, frequency, or phase to carry audio or data information.

Question 2

In amateur radio, what is a 'phone' contact?

Accepted Answer

A voice (SSB, FM, or AM) contact

Answer

Phone refers to voice modes of communication including SSB, AM, and FM, as opposed to CW (Morse) or digital modes.

Question 3

What does 'ARES' stand for?

Accepted Answer

Amateur Radio Emergency Service

Answer

ARES is the Amateur Radio Emergency Service, an ARRL-organized group that provides communications assistance during emergencies.

Question 4

What is 'pileup' in DX operating?

Accepted Answer

Multiple stations simultaneously calling a rare DX station

Answer

A pileup occurs when many stations call a rare or sought-after DX station at the same time, creating intense competition for contacts.

Question 5

What is meant by 'propagation' in amateur radio?

Accepted Answer

The way radio waves travel from transmitter to receiver

Answer

Propagation describes how radio waves travel through and reflect off the Earth's atmosphere and ionosphere to reach distant stations.

(ARRL) American Radio Relay League Practice Test