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ECT
263 Week 1 Discussion 1 | Assignment Help | Devry University
Week 1: Audio Quality
Measurement
Research and share with
the class information that you have found on how manufacturers measure the
quality of their products. Here are some questions that you might answer.
What is meant by total
harmonic distortion (%THD)?
What are acceptable
values for %THD in home audio equipment?
Are there any industry
organizations that regulate or specify quality standards in audio equipment?
Can you find any
specific specification sheets for commercially available equipment (usually in
PDF format)?
You may post your own
unique finding or you may comment constructively to what someone else has
posted. If you choose to comment on someone else's posting, you could add
additional information or offer a differing point of view (as long as it is
done professionally and does not insult or offend the original poster.)
You need to reference
what you have found either in printed material, such as the textbook, or as a
URL if the source is something you found on the Internet. You should include
the URL so that class members can also visit your site if it is an Internet
source. You can also include attachments in your posting. If you comment on
someone else's posting you need to add value to that posting. Do not simply say
something like "I totally agree with you Bob!"
ECT
263 Week 1 Lab Assignment Help | Devry University
Name: [Replace with
your name]
Template to submit iLab
Activity - Linear and non-linear spectrum analysis using MultiSim
(Filename convention:
first initial last name LINMS1.doc
Example: Jsmith LINMS1
.doc)
Complete this document
and submit to the DEP (DeVry eLearning Platform) dropbox.
• Copy and paste the
screen capture of the MultiSim spectrum analyzer displaying the frequency
spectrum of the pure, undistorted sine wave below.
• Copy and paste the screen
capture of the MultiSim spectrum analyzer displaying the frequency spectrum of
the clipped, distorted sine wave below.
• Complete the table
listing the frequencies and amplitudes of the fundamental and each harmonic of
the distorted sine wave below.
In the table above, f0
is the fundamental frequency. 2f0 is the second harmonic, 3f0 is the third
harmonic, and so on.
f0
2f0
3f0
4f0
5f0
Frequency
Amplitude (V)
ECT
263 Week 2 Discussion | Assignment Help | Devry University
Week 2 AM transmission
Research and share with
the class information that you have found on modulation index. Here are some questions
that you might answer:
• What is meaning of
the modulation index?
• What is over
modulation?
• How do you explain
modulation index equal to one (m=1)?
You may post your own
unique finding or you may comment constructively to what someone else has
posted. If you choose to comment on someone else's posting, you could add
additional information or offer a differing point of view (as long as it is
done professionally and does not insult or offend the original poster.)
You need to reference
what you have found either in printed material such as the textbook, or as a
URL if the source is something you found on the Internet. You should include
the URL so that class members can also visit your site if it is an Internet
source. You can also include attachments in your posting. If you comment on
someone else's posting, you need to add value to that posting. Do not simply
say something like, "I totally agree with you, Bob!"
ECT
263 Week 2 Lab Assignment Help | Devry University
Name: [Replace with
your name]
Template to submit iLab
Activity – AM modulation using Tutor*Tims
(Filename convention:
first initial last name AMTT 1.doc
Example:
jsmithAMTT1.doc)
Complete this document
and submit to the DEP (DeVry eLearning Platform) dropbox.
• (Part A) After using
Paint to edit the image to indicate your values of EMAX and EMIN for your
unique envelope. Paste the edited image of the Tutor*Tims AM envelope showing
EMAX and EMIN below.
• (Part A, cont.) Show
your calculations of modulation factor, m below.
• (Part B) After
editing in Paint to show the frequencies of the carrier, the upper sideband and
the lower sideband and the relative amplitudes of each, paste the Tutor*Tims
spectrum analyzer display below.
ECT
263 Week 3 Discussion | Assignment Help | Devry University
Week 3: AM Receiver
Study the AM receiver
block diagram. Answer some of the questions related to the AM receiver as shown
below:
• What frequencies
would appear at the output of RF amplifier?
• What is the function
of mixer/local oscillator?
• The IF amplifiers are
tuned to what frequency?
• IF amplifiers are
tuned to one frequency. Why ?
• What is the function
of detector circuit?
You may post your own
unique finding or you may comment constructively to what someone else has
posted. If you choose to comment on someone else's posting, you could add
additional information or offer a differing point of view (as long as it is
done professionally and does not insult or offend the original poster).
You need to reference
what you have found either in printed material such as the textbook, or as a
URL if the source is something you found on the Internet. You should include
the URL so that class members can also visit your site if it is an Internet
source. You can also include attachments in your posting. If you comment on
someone else's posting, you need to add value to that posting. Do not simply
say something like, "I totally agree with you, Bob!"
ECT
263 Week 3 Lab Assignment Help | Devry University
Week 3: Labs 3 and 4 of
9
This week you will
complete the following two labs; instructions are located in the Lab Overview.
1. Complete Lab 3:
Amplitude Demodulation Using Tutor*TIMS.
2. Complete Lab 4:
Troubleshooting an AM System Using MultiSim.
Specific scheduling of
the use of the online net*TIMS equipment will be explained in the Lab
instructions.
Don't forget to submit
both your labs.
Name: [Replace with
your name]
Template to Submit iLab
Activity—AM Demodulation Using Tutor*Tims
(Filename convention:
firstinitiallastnameAMdemodTT2.doc
Example:
jsmithAMdemodTT2.doc)
Complete this document
and submit to the DEP (DeVry eLearning Platform) Dropbox.
• Use the Grab button
on Tutor*Tims to capture the modulation input on one channel and the AM
envelope on the other. Insert or paste the image below.
• Use the Grab button
on Tutor*Tims to capture the modulation input on one channel and the 60 kHz LPF
recovered output on the other. Insert or paste the image below.
• Use the Grab button
on Tutor*Tims to capture either the modulation input or the AM envelope on one
input and the fixed LPF output on the other. Insert or paste the image below.
• Explain the bumpiness
that you observed in the waveform when you used the fixed RC LPF on the
Utilities module.
ECT
263 Week 3 Quiz | Assignment Help | Devry University
Question 1
(TCO 3) Referring to
the diagram below, which block is the RF amplifier?
ECT
263 Week 4 Discussion Assignment Help | Devry University
Week 4 FM Transmission
Research and find out
information about FM modulation, modulation index, PLL, and FM transmitter.
Below are some questions that you might answer.
What is modulation
factor on FM transmission?
Why do we use feedback
in FM transmitters??”
Why do we use
Preemphasis for FM transmitters?
Bandwidth in FM
transmission, why do we need wider bandwidth than in AM?
Bessel functions.
What is the maximum frequency of the
modulating signal, used in FM?
You may post your own
unique finding or you may comment constructively to what someone else has
posted. If you choose to comment on someone else's posting, you could add
additional information or offer a differing point of view (as long as it is
done professionally and does not insult or offend the original poster).
You need to reference
what you have found either in printed material such as the textbook, or as a
URL if the source is something you found on the Internet. You should include
the URL so that class members can also visit your site if it is an Internet
source. You can also include attachments in your posting. If you comment on
someone else's posting, you need to add value to that posting. Do not simply
say something like, "I totally agree with you, Bob!"
ECT
263 Week 4 Lab Assignment Help | Devry University
Week 4 Lab Question 1
iLab—Frequency
Modulation Using Tutor*Tims
(Filename convention:
first initial last name FMTT 1.doc
example:
jsmithTTFM1.doc)
Part A—Analyzing the
Time-Domain Envelope
Using Tutor*Tims,
create the frequency modulator circuit shown below.
ECT
263 Week 4 Quiz | Assignment Help | Devry University
Week 4 Quiz
Question 1
(TCO 4) From the
spectrum analyzer display shown below, determine the total bandwidth needed to
transmit that signal.
ECT
263 Week 5 Discussion | Assignment Help | Devry University
Week 5: Industrial
Implementations of the PLL
Research and share with
the class information that you have found on industrial implementation of phase
locked loops. Here are some questions that you might answer:
1.Who and when invented
PLL?
2.When was PLL used for
the first time?
3.In which type of
communication system PLL was used for the first time?
Basic principles of
PLL?
What do manufacturer
spec sheets say about PLL applications?
How could PLLs be used
to control the speed of a motor?
Frequency
synthesizers. What could be used as a
frequency divider in a PLL frequency synthesizer?
What is a "beat
frequency?"
You may post your own
unique finding or you may comment constructively to what someone else has
posted. If you choose to comment on someone else's posting, you could add
additional information or offer a differing point of view (as long as it is
done professionally and does not insult or offend the original poster.)
You need to reference
what you have found either in printed material such as the textbook, or as a
URL if the source is something you found on the Internet. You should include
the URL so that class members can also visit your site if it is an Internet
source. You can also include attachments in your posting. If you comment on
someone else's posting you need to add value to that posting. Do not simply say
something like "I totally agree with you Bob!"
ECT
263 Week 5 Lab Assignment Help | Devry University
Week 5 Lab Question 1
iLab5—Phase Locked Loop
S-curve Using Tutor*Tims
(Filename convention:
first initial last name PLLTT1 .doc)
Part A—Experiment Setup
Using Tutor*Tims,
create the signal generator and phase locked loop circuit shown below.
image
Figure 1
This circuit consists
of two sections; the variable frequency signal source (modules 1–3) and the
phase locked loop itself (modules 4–6).
You can use the
positions of the knobs shown as a starting point. One setting that is
particularly important is that the idle frequency of the signal source VCO and
the PLL VCO must be the same. In this case, note that both are set for f0 =
100000. Both of the VCO’s idle frequencies are set to 100KHz.
The Voltage control on
the Variable DC and Amplifiers module (module 1) controls the voltage to the
signal source VCO and hence its frequency.
The figure below shows
a block diagram of what we have created thus far.
image
Figure 2
The oscilloscope traces
show that the PLL’s VCO is synchronized with the incoming signal source’s VCO.
What you need to do is
to vary the input frequency (by varying the voltage produced by the Variable DC
[module 1]) and seeing what effect that has on the PLL.
We want to create an
S-curve characteristic of the PLL that shows the tracking range where the PLL’s
VCO is locked onto the incoming signal. To do this, we will need to vary the
input frequency and measure the error voltage as the PLL’s VCO adjusts to stay
in sync with the incoming signal. We will need to use Tutor*Tims’ built-in
metering to do this.
On the bottom half of
Tutor*TIMS you will see a module just to the left of the scope titled simply
Tutor TIMS. This module has an input that can be used to measure frequency and
voltage. The module also has a control labeled Elasticity, which controls the
droopiness of the wires and a switch that controls the speed of the signal
processing. Set the speed switch to Fast.
In the process of
taking our measurements, we will need to switch between the voltmeter function
and the frequency counter function. Figure 3 below shows the alternating
connections to take these measurements.
image
Figure 3
The dashed purple lines
show the two alternate connections that we will be using to take our
measurements. When you connect the metering unit to the VCO output (module 3),
you will be measuring the input frequency applied to the PLL from the variable
signal source. When you connect the metering unit to the 60KHz LPF (module 5)
you will be measuring the resulting error voltage needed to keep the PLL’s VCO
in sync with the incoming signal.
Initially in Figure 1
above, the scope was displaying the outputs of the two VCOs. Now, in Figure 3,
it’s displaying the DC voltages applied to the VCOs. Figure 1 shows a more
traditional view of a PLL where one can see whether the two signals are in
phase or not. In this experiment, we need to measure the RMS value of the DC
error voltage. If you’ll recall from your basic electronics, RMS is the DC
equivalent of an AC signal. There is no such thing as a negative RMS voltage.
So, to help us out we will use the scope, which can show a DC offset just fine,
to tell us whether the number that we read on the RMS voltmeter is positive or
negative. Look for two small triangles on the scope display (Figure 4).
image
Part B—Recording Your
Data
Now you are ready to
record your data. Open an Excel spreadsheet. Label the left-hand column fIN.
Label the right-hand column Error voltage. Start by connecting the metering
input to the error voltage output of the low-pass filter (module 5). Wait for
the voltage to stabilize. Record the voltage (paying attention to whether it’s
above or below the ground reference on the scope. Move the metering input lead
to the output of the PLL VCO (module 6) and record the frequency. (The graphic
above the display may say Hz but in this case it is actually KHz.)
Move the metering input
back to the error voltage. Gradually change the input frequency by adjusting
the DC voltage produced by the variable DC source (module1). Again, wait for
the reading to stabilize and record it. Move the lead back to the input
frequency (output of the first VCO [module 3]) and again record the frequency.
Construct a table of
data in Excel. In all, you should have 5–10 data points within the tracking
range and two to three above and two to three below the tracking range. fIN is
your independent variable that you record in the left-hand column in Excel.
Keep your data points in order. That is, make sure that your data goes from the
lowest frequency to the highest frequency like what was done in the lecture
section in eCollege. We want to see what happens to the error voltage as we
vary the input frequency.
Figure 5 below shows
what the error voltage will look like when you exceed the tracking range in
either direction.
image
The blue trace is the
error voltage output of the low-pass filter. You can see that it jumps around
wildly as the PLL tries—unsuccessfully—to stay synchronized with the input
signal.
Part C—Plotting Your
Data
Once you’ve recorded
enough data points in your Excel table, highlight the entire table (including
the headings) and select the Chart Wizard. Then select x-y scatter plot and
format the graph as you see fit. (Titles, background, etc., is your choice.) Make
sure that all of your data is clearly understandable to the reader
Use the Grab button to
capture a sample of your circuit and paste it into the PLLTT1 answer sheet. It
doesn’t matter which data point you grab—just a typical representative screen
shot of your experiment in progress.
Copy your data table
from Excel and paste it into the answer sheet.
Copy your completed
graph from Excel and paste that into the answer sheet.
Submit your answer
sheet document to the eCollege Dropbox.
ECT
263 Week 5 Quiz | Assignment Help | Devry University
Question 1
(TCO 5) Referring to
the block diagram of a PLL below, what is the function of Block C?
ECT
263 Week 6 Discussion | Assignment Help | Devry University
Week 6 FM Receiver
How would you
differentiate between AM receiver and FM receiver?
1. FM Demodulators,
what circuits are used for FM demodulation.
2. PLL method for FM
demodulation.
3. Radio frequency
amplifier in FM receiver and it's role.
4. Automatic Frequency
Control system in FM receiver.
5. Is Automatic Gain
Control used in FM receivers?
6. What is the function
of Limiter in FM receiver?
7. Image frequencies
and their rejection in FM receivers.
8. Receiver
measurements: Sensitivity, Quieting Sensitivity, Selectivity.
You may post your own
finding or you may comment constructively to what someone else has posted. If
you choose to comment on someone else's posting, you could add additional
information or offer a differing point of view (as long as it is done
professionally and does not insult or offend the original poster).
You need to reference
what you have found either in printed material such as the textbook, or as a
URL if the source is something you found on the Internet. You should include
the URL so that class members can also visit your site if it is an Internet source.
You can also include attachments in your posting. If you comment on someone
else's posting, you need to add value to that posting. Do not simply say
something like, "I totally agree with you, Bob!"
ECT
263 Week 6 Lab Assignment Help | Devry University
iLab6 – FM Demodulation
Using Tutor*Tims
(Filename convention:
first initial last name FM demod TT1. doc)
Part A—Experiment Setup
Hopefully you will find
this a fairly easy and straightforward experiment. It is actually a
continuation and integration of the concepts and circuits that you explored and
built in Weeks 4 and 5.
Using Tutor*Tims,
create the FM modulator and phase locked loop demodulator circuit shown below.
image
image
Part B—Capturing
Waveforms
Use the Grab button to
capture a sample of your circuit showing the audio modulation signal on one
channel and the frequency modulated carrier on the other. Paste it into the
FMdemodTT1 answer sheet.
Grab a screen shot of
the audio modulation signal on one channel and the demodulated signal coming
from the error voltage output of the PLL on the other channel. Paste it into
the FMdemodTT1 answer sheet.
Submit your answer
sheet document to the eCollege Dropbox.
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