E8B01:

What is the modulation index of an FM signal?

1. The ratio of frequency deviation to modulating signal frequency
2. The ratio of modulating signal amplitude to frequency deviation
3. The type of modulation used by the transmitter
4. The bandwidth of the transmitted signal divided by the modulating signal frequency

E8B02:

How does the modulation index of a phase-modulated emission vary with RF carrier frequency?

1. It increases as the RF carrier frequency increases
2. It decreases as the RF carrier frequency increases
3. It varies with the square root of the RF carrier frequency
4. It does not depend on the RF carrier frequency

E8B03:

What is the modulation index of an FM-phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency when the modulating frequency is 1000 Hz?

1. 3
2. 0.3
3. 3000
4. 1000

E8B04:

What is the modulation index of an FM-phone signal having a maximum carrier deviation of plus or minus 6 kHz when modulated with a 2 kHz modulating frequency?

1. 6000
2. 3
3. 2000
4. 3-Jan

E8B05:

What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus-or-minus 5 kHz when the maximum modulation frequency is 3 kHz?

1. 60
2. 0.167
3. 0.6
4. 1.67

E8B06:

What is the deviation ratio of an FM-phone signal having a maximum frequency swing of plus or minus 7.5 kHz when the maximum modulation frequency is 3.5 kHz?

1. 2.14
2. 0.214
3. 0.47
4. 47

E8B07:

Orthogonal Frequency Division Multiplexing is a technique used for which type of amateur communication?

1. High-speed digital modes
2. Extremely low-power contacts
3. EME
4. OFDM signals are not allowed on amateur bands

E8B08:

What describes Orthogonal Frequency Division Multiplexing?

1. A frequency modulation technique that uses non-harmonically related frequencies
2. A bandwidth compression technique using Fourier transforms
3. A digital mode for narrow-band, slow-speed transmissions
4. A digital modulation technique using subcarriers at frequencies chosen to avoid intersymbol interference

E8B09:

What is deviation ratio?

1. The ratio of the audio modulating frequency to the center carrier frequency
2. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency
3. The ratio of the carrier center frequency to the audio modulating frequency
4. The ratio of the highest audio modulating frequency to the average audio modulating frequency

E8B10:

What is frequency division multiplexing?

1. The transmitted signal jumps from band to band at a predetermined rate
2. Two or more information streams are merged into a baseband, which then modulates the transmitter
3. The transmitted signal is divided into packets of information
4. Two or more information streams are merged into a digital combiner, which then pulse position modulates the transmitter

E8B11:

What is digital time division multiplexing?

1. Two or more data streams are assigned to discrete sub-carriers on an FM transmitter
2. Two or more signals are arranged to share discrete time slots of a data transmission
3. Two or more data streams share the same channel by transmitting time of transmission as the sub-carrier
4. Two or more signals are quadrature modulated to increase bandwidth efficiency