Types of Transmissions

Question 1

What term describes a wide-bandwidth communications system in which the RF carrier frequency varies according some predetermined sequence?

Answer 1

Spread spectrum communication.

Question 2

Name two types of spread spectrum systems used in most RF communications applications?

Answer 2

Direct Sequence and Frequency Hopping.

Question 3

What is the term used to describe a spread spectrum communications system where the center frequency of a conventional carrier is altered many times per second in accordance with a pseudo-random list of channels?

Answer 3

Frequency hopping.

Question 4

A TDMA radio uses what to carry the multiple conversations sequentially?

Answer 4

Separate time slots.

Question 5

Which of the following statements about SSB voice transmissions is correct?

Answer 5

They normally use J3E emissions, which consists of one sideband and a suppressed carrier.

Question 6

What are the two most-used PCS (Personal Communications Systems) coding techniques used to separate different calls?

Answer 6

CDMA and GSM