Question
QUESTION 22 What does the FM Modulation Index, ?, tell us. a. How much the phase of the carrier frequency is allowed to change b.
QUESTION 22
What does the FM Modulation Index, ?, tell us.
a. How much the phase of the carrier frequency is allowed to change | ||
b. What the phase of the message signal is in relation to the carrier frequency | ||
c. How much the carrier frequency is allowed to deviate from center | ||
d. All of the above |
10 points
QUESTION 23
23. Calculate the data rate for a 1200 baud signal where each symbol can take on one of two levels (M=8)
a. 2400 bps | ||
b. 4800 bps | ||
c. 3600 bps | ||
d. 9600 kbps |
10 points
QUESTION 24
A symbol can take on one of 64 signaling levels. How many bits can be represented by a single symbol?
a. N=2 | ||
b. N=4 | ||
c. N=6 | ||
d. N=8 |
10 points
QUESTION 25
Given the following AM signal, determine the carrier wave's amplitude (Ac) and frequency (fc), the message signals frequency (fm), and the modulation index (): s(t) = 3[1 + 0.6cos (2?100E3Hz*t)] cos (2?1E9Hz*t)
a. Ac=3, fc=100kHz, fm=1GHz, =0.6 | ||
b. Ac=3, fc=1GHz, fm=100kHz, =0.6 | ||
c. Ac=0.5, fc=1GHz, fm=100kHz, =6 | ||
d. Ac=0.5, fc=1GHz, fm=2kHz, =6 |
10 points
QUESTION 26
Given the following equation for an FM signal, select the correct information below:
sFM(t) =3cos[(2?280khz*t)+3sin(2?4000Hz*t)], kVCO=2000(Hz/v)
a. FM Index, ?=9, Message Amplitude, Am=3v | ||
b. FM Index, ?=3, Message Amplitude, Am=6v | ||
c. FM Index, ?=3, Message Amplitude, Am=3v | ||
d. FM Index, ?=9, Message Amplitude, Am=6v |
10 points
QUESTION 27
Determine your FM bandwidth given the following: FM Index ?=5, frequency of your message is fm-4000Hz.
a. 4 kHz | ||
b. 12 kHz | ||
c. 24 kHz | ||
d. 48 kHz |
10 points
QUESTION 28
Given the following equation for an PM signal, select the correct information below:
sPM(t) =3 cos[(2?300MHz*t+5cos(2?4kHz*t)], kP=0.3
a. PM Index, p=5, Message Amplitude, Am=16.67v | ||
b. PM Index, p=6, Message Amplitude, Am=16.67v | ||
c. PM Index, p=3, Message Amplitude, Am=6v | ||
d. PM Index, p=6, Message Amplitude, Am=5v |
10 points
QUESTION 29
With PM, the message amplitude and frequency are directly related to bandwidth.
True
False
10 points
QUESTION 30
When frequency division multiplexing (FDM) is used, guard channels are NOT required in-between frequency channels.
True
False
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