7-A-010: Carrier & Sidebands
7-10B1:
Which of the following statements describes the carrier?
The carrier is a Radio Frequency (RF) signal that is modulated to carry intelligence.
The carrier consists of at least 3 separate but closely spaced frequencies.
The carrier is used to modulate the information signal.
There are always sidebands on either side of the carrier.
7-10B2:
On what frequencies would the J3E emission be used for GMDSS Distress communications?
2182.0 kHz, 16420.0 kHz or 8291.0 kHz.
2182.0, 2187.5 kHz or 8414.5 kHz.
8414.5 kHz, 8291.0 kHz or 8376.5 kHz.
4125.0 kHz, 16420.0 kHz or 4177.5 kHz.
7-10B3:
How many sidebands are present in the J3E mode?
One upper sideband.
Two sidebands and a carrier.
One lower sideband.
Two carriers and one sideband.
7-10B4:
What is the signal transmitted in H3E mode?
A full carrier and the upper sideband.
Two sidebands, upper and lower.
A reduced carrier and the lower sideband.
A full carrier and both upper and lower sidebands.
7-10B5:
What is the signal transmitted in J2B mode?
An upper sideband of 2 alternating tones.
A full carrier and one sideband.
A full carrier and two sidebands.
An upper sideband of a single tone switched on and off.
7-10B6:
Which of the following statements is true?
There are two tones used in J2B mode.
An RF carrier is always required to carry the information.
There is only a single tone used in J2B mode.
There are a carrier and two sidebands in H3E mode.
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Color key:
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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