ECE124 HW for 1Q1415 rel. 1.0
Series T1314 – Difficult Homeworks
HW1: Research: individual
A11 one group/class.
One page per problem computer printed, multimodal, landscape orientation. Cite relevant
references at the bottom part of the each page, at
least one book, cite ISBN, title, author, chapter,
page, not including textbook. You may also cite
internet references. You cannot use the prescribed
textbook or course reference, e.g.: Tomasi,
LecNotes3, as your listed reference. Due dates
just before the exams.
Include a cover page. All members signs on cover.
Deadline is within 15 minutes start of class of
earliest member. In case of modulo based
variable, include modulo computations in all
relevant pages. List any assumption made, and
additional data arising from your research, e.g.:
primary parameters. List the equations used and if
needed the legend. Do not show intermediate
computations anymore.
Example: Compute X = remainder of modulo 4 of
sum of equivalent number of 1st letters of
member’s’ surnames where Cruz = 3 and Santos =
6, therefore X = Excel MOD(9,4) = 1
Variables:
W= rem mod (sum of 1st letters of surnames, 9)
X = rem mod (sum of 1st letters of surnames, 4)
Y= rem mod (sum of 1st letters of surnames, 2)
Note: include modulo computations for WXY as
part of submission, in a separate page
Warning:
For each HW you can join only one group.
Wrong modulo math = at best 5/100 points
All reports to be packaged as one report with
proper citation and a bibliography. Submit hard
copy.
Surnames starting with letter A to F: The latest
IEEE recommendations on how to determine Fade
Margin terrestrial LOS
G to R: The latest IEEE recommendations on how
to determine reflection points in terrestrial LOS
S to Z: Other than Radio Mobile, other software
aids for LOS path profiling, identify supplier and
provide user guide and examples. Make a table
comparing the features of the various softwares.
Individual research hard copy (in portfolio file name
student surname+firstname ; portfolio includes
answers to Q&A, screen shots of moodle exam
results, copies of HWs, in CD w/ VCD jacket; a
common CD may be submitted with each student
files in separate folders or directories).
HW2: LOS maximum group size = 5
P1 By how much will the reflection point shift for a
single hop between Mapua (chapel) with 300m
antenna height and Malayan colleges (center of
track and field) with 150 m antenna height, when k
deteriorates from 1 to (W +1)/12? Use great circle
distance. Compute manually.
P2 Same given as P1, find the lowest antenna
heights that will exactly clear 0 % of the 1st Fresnel
zone using Radio Mobile at standard k. Assume
equal antenna heights. Show path profile only in a
separate sheet. F = 10 + W GHz.
P3 Same given as P2, but the antenna at Mapua
Intra is reduced by 5.X %, determine diffraction
losses. Manual computation
4Q1314 Com4 HW
P4 For solo submissions and group size less than
5, same given as P2, find all other path losses
P4 For solo submissions and group size less than
5 using the given of P2 find the separation and
velocities of the satellites at perigee.
HW3: SatCom maximum group size = 6
P1 Given one FEX below depending on computed
W, find the look angles for the satellites in P2 as it
passes equator using charts and provide a solution
outline of the process. Use charts for look angles
and provide/explain solution process. Then create
2 charts of elevation angle (y-axis) of GSO satellite
X vs cities (mayor’s office) of the major provinces
and all Ws (x-axis) arranged by coordinates. For
these charts use equations to solve for elevation
angle.
W
0
1
2
3
4
5
6
7
8
Fixed Earth Station
PLDT Boni Dansalan VSAT office
Mapua, Intra chapel
TUP, Manila, chapel
DLSU Taft chapel
UST chapel/church
St Scho Manila chapel
UP, Dil campus chapel/church
UPLB, chapel
Malayan, center of track and field
HW4: W.G. maximum group size = 7
P1 An air-filled (2.6 + X/5) inches by (2.5 + Y/10)
inches rectangular wave guide propagates (2.4 +
W/10) Ghz in the dominant mode. What is the
maximum power that can be transported if the
maximum allowable electric field intensity within
the guide is 100 + X + Y v/m? No shortcuts in
solution, that is provide complete solution including
the integration process. Determine also what
modes other than dominant can propagate.
Tabulate results
P2 This problem deals will lossy w.g. The distance
between the RF- amplifier and the radar antenna is
15.3 + X meters. The operating frequency f will be
12.W GHz. Design requirement: the only
propagating mode must be the dominant mode
The attenuation constant αc must be kept below:
P2 Compute the actual degree, apparent degree
and km separation, and also velocity in radians/sec
and km/sec of the pairs of satellites at apogee.
Choose satellite based on computed X.
X
Even
Odd
Satellite1
Garuda,
Agila II
Satellite 2
one of the Sirius sat
one of the Archimedes sat
P3 Compute actual degree apparent degree and
km separation between two adjacent satellites
orbiting on the same plane, and the elevation
angle and span range to one of the pair (satellite)
from a FES located exactly between the two
satellites. Choose satellite constellation based on
computed W.
W
Satellite
1 or 4 Iridium
2 or 5 Globalstar
3 or 6 GPS
Design a hollow rectangular waveguide for use to
transmit high microwave power with this low-loss in
a radar system. You are free to choose but do not
assume the material of the waveguide, the
dielectric medium and the dimensions as long as
you fulfill the criteria. In summary find the metal to
use, the dielectric to use and the dimensions of the
w.g. Note: lossless equations provided in the
lectures do not apply as this is a lossy case. Prove
also that other modes cannot propagate
P3 For solo submissions redo P2 this time for a
cylindrical waveguide.
NOTICE: It is possible that the average of all HWs
will be considered in lieu of a Quiz
4Q1314 Com4 HW
End of HWs
4Q1314 Com4 HW