3-M-082: Types of Transmissions
3-82M1:
What term describes a wide-bandwidth communications system in which the RF carrier frequency varies according to some predetermined sequence?
Spread spectrum communication.
Amplitude compandored single sideband.
SITOR.
Time-domain frequency modulation.
3-82M2:
Name two types of spread spectrum systems used in most RF communications applications?
Direct Sequence and Frequency Hopping.
AM and FM.
QPSK or QAM.
Frequency Hopping and APSK.
3-82M3:
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?
Frequency hopping.
Direct sequence.
Time-domain frequency modulation.
Frequency compandored spread spectrum.
3-82M4:
A TDMA radio uses what to carry the multiple conversations sequentially?
Separate time slots.
Separate frequencies.
Separate pilot tones.
Separate power levels.
3-82M5:
Which of the following statements about SSB voice transmissions is correct?
They normally use J3E emissions, which consists of one sideband and a suppressed carrier.
They use A3E emission which are produced by modulating the final amplifier.
They use F3E emission which is produced by phase shifting the carrier.
They may use A1A emission to suppress the carrier.
3-82M6:
What are the two most-used PCS (Personal Communications Systems) coding techniques used to separate different calls?
CDMA and GSM.
QPSK and QAM.
ABCD and SYZ.
AM and Frequency Hopping.
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