7-A-083: MF-HF: Modulation, Bandwidth & Emissions
7-83J1:
For RF communications, "modulation" is best defined as:
The combination of information or intelligence with a carrier frequency.
Using a single carrier frequency with the proper power level.
Setting up the transceiver with the correct bandwidth to ensure proper communications.
The combination of the received frequency and oscillator frequency in the mixer.
7-83J2:
For RF communications, "bandwidth" is best defined as:
The portion of the radio spectrum consumed by a particular emission selection and modulation technique.
The modulation technique required to insure proper ITU channel spacing.
The emission designation resulting from the desired modulation technique.
The portion of the radio spectrum reserved for frequency allocations by the ITU.
7-83J3:
In an AM signal using voice:
There is a constant amplitude carrier with complex upper and lower sidebands varying in amplitude and frequency.
Varying the amplitude of the carrier and employing both sidebands without the carrier.
Varying only the amplitude of the carrier, depending on Double or Single-Sideband operations.
Varying the amplitude of the carrier and employing both sidebands and the carrier.
7-83J4:
In FM communications, the information is applied to the carrier by:
Varying the frequency of the carrier.
Varying the amplitude or the frequency of the carrier, depending on Double or Single-Sideband operations.
Varying only the frequency of the carrier, depending on Double or Single-Sideband operations.
Varying the amplitude of the carrier.
7-83J5:
The proper sequence of emissions corresponding to the sequence AM-Voice DSB, SSB-Voice without carrier, USB-Voice with carrier and FM-Voice, is:
A3E, J3E, H3E, F3E.
A3E, H3E, J3E, F3E.
J3E, H3E, A3E, F3E.
H3E, A3E, J3E, F3E.
7-83J6:
The proper sequence of emissions corresponding to the sequence SSB-Voice without carrier, USB-Voice with carrier, FM-Voice and SITOR TELEX is:
J3E, H3E, F3E, F1B.
H3E, J3E, F3E, F1B.
J3E, H3E, F1B, F3E.
H3E, J3E, F1B, F3E.
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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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