Download Lab Experiment # 6/1

MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY, JAMSHORO
DEPARTMENT OF TELECOMMUNICATION ENGINEERING
SATELLITE COMMUNICATION (1st Term, Final Year)
Lab Experiment # 6/1
Name: ___________________________________________________Roll No: _____________
Score: _____________________ Signature of lab tutor: ____________ Date: _______________
PROGRAMMING THE RECEIVER
PERFORMANCE OBJECTIVE
Upon successful completion students will be able to:
 Indicate the sequence of the main operations for programming the receiver.
EQUIPMENTS


Satellite Receiver Trainer SAT5/EV
1 television set
DISCUSSION
Make sure that the Receiver is correctly connected with the Outdoor unit.
Figure 6.1: Connection with the TV set via A/V
Programming Modes:
As the trainer consists of two receivers, the programming must be carried out on them both. The
programming is carried out via the remote control.
Radio Communications Lab
MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY, JAMSHORO
DEPARTMENT OF TELECOMMUNICATION ENGINEERING
SATELLITE COMMUNICATION (1st Term, Final Year)
Lab Experiment # 6/2
1. Digital Receiver: this receiver can be programmed through the Menu displayed on the
TV screen.
2. Analog Receiver: the set parameters and data can be displayed on the alphanumeric
display of four characters that is also used to program this receiver.
The programming parameters can be entered only if the characteristics of the channels that can
be received (such as frequency, polarization, audio etc) are known. This information is usually
available in specialized magazines or in the installation manual of the receiver.
The programming for digital channels can be automatic or manual. It is better to choose the
automatic programming. For manual programming, it is necessary to assign some parameters to
each satellite.
Before proceeding with the programming, the following information is necessary.
1. Skew:
The skew signal is not used in our fixed system. It is a control voltage of the polarizer for
both LNBs (bands Ku and C). This system does not use the Skew to change the
polarization from Horizontal to Vertical or vice versa. Each position corresponds to a
binary value depending on the polarization (H or V) and on the satellite position.
Observe that the Skew control is available in the digital reception only. When switching
from the digital reception to the analog one, the skew remains in the last position without
any change.
This enable to use the analog section with the skew control in motor-driven systems, after
a digital program of the same satellite has been selected previously.
2. 22 KHz:
It is the selection tone used in our system to change the band (high/low).
3. DiSEqC:
It is the standard used in fixed multi-LNB systems. It is used with this system to select
which of the signals received by the two antennas must reach the receiver.
4. LNB:
It is the type of LNB being used. A dual-band LNB is used for the band Ku (L.O.
frequencies of 9750 and 10600 MHz). For a motor-driven installation, in the Ku band, to
memorize two single LNBs; one with L.O. of 9750 MHz and the other with L.O. of
10750 MHz for the analog receiver while for the digital one it has an option including
two frequencies 9750/10750.
Radio Communications Lab
MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY, JAMSHORO
DEPARTMENT OF TELECOMMUNICATION ENGINEERING
SATELLITE COMMUNICATION (1st Term, Final Year)
Lab Experiment # 6/3
5. 13/18V:
These are the voltages selecting the polarization (vertical/horizontal). In motor driven
systems, it selects the high/low Ku band of the LNB.
6. 0/12V:
These are the voltages sent to the antenna to control the switch selecting the signal of the
LNB of band Ku or that of band C that will be sent to the receiver (switch input IN).
Typically 0V is set to select the band Ku (input 1) and 12V to select the band C (input 2).
This is not used in our system.
PROCEDURE:
Programming the Digital Receiver:
1. After powering the Trainer make sure that the analog receiver is off (in Stand-by mode)
by pressing the OFF key of the remote control or the pushbutton PWR ON available on
the central panel of the Trainer; check that the analog display indicates “-”.
2. Switch ON the digital receiver by pressing the pushbutton available on the front panel.
3. Press the MENU key of the remote control. The MAIN MENU is displayed.
4. Select the option Installation that includes the main items for the programming.
The options in the Installation menu screen are indicated below:
a) LNB Setting:
This menu is used to assign a particular LNB (with the data characterizing it) to each
satellite.
i.
Satellite name: Select the desired satellite from the list of the available satellites.
If it is not available, but its data are known, enter it on the menu SAT/TP Edit.
ii.
LNB Frequency: Select the frequency of the assigned local oscillator.
 9750/10600 for the universal LNB used in this system.
 5150 for the band C, and 9750/10750 for the band Ku for a motordriven system. It is also possible to use the digital keyboard.
iii. LNB Power: ON must be selected to power the LNB.
iv.
22 KHz: It can be selected only when the LNB used has a single local oscillator
(so a single frequency) as in the case of motor-driven system. In this system using
a universal LNB, it is not possible to deactivate this function.
Radio Communications Lab
MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY, JAMSHORO
DEPARTMENT OF TELECOMMUNICATION ENGINEERING
SATELLITE COMMUNICATION (1st Term, Final Year)
Lab Experiment # 6/4
v.
vi.
vii.
DiSEqC 1.1: It is used in systems with multiple LNBs. It will be disabled in our
system.
DiSEqC 1.0: It is used in systems with multiple LNBs. In our system, using two
LNBs and antennas, it must be enabled and is preferred to the version 1.1. The
signal with protocol DiSEqC (Digital Satellite Equipment Control) is sent though
the antenna cable from the receiver to the switch supporting the same protocol, to
enable the switching of the input signals to the same switch. The figure 6.2 shows
an example of application with both the DiSEqC controls. For instance, if the
LNB connected with the output A7 has to be selected, it is necessary to set:
 DiSEqC 1.1: 2 of 4.
 DiSEqC 1.0: 3 of 4.
Service Search: Selecting this option will directly open the Menu Service Search
that enables to start searching programs according to the set data.
Figure 6.2: Example of using DiSEqC.
b) Service Search:
This menu is used to search the programs associated to a specific satellite and system.
i.
Satellite Name: Select the desired satellite from the list of the available satellites.
If it is not available, but its data is known, enter it on the Menu SAT/TP Edit.
ii.
Search Mode: Four search modes can be selected: Auto for using the information
of the receiver, Manual if frequency and symbol-rate data are known; Advanced
if Audio PID, Video PID or PCR PID is known.
Radio Communications Lab
MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY, JAMSHORO
DEPARTMENT OF TELECOMMUNICATION ENGINEERING
SATELLITE COMMUNICATION (1st Term, Final Year)
Lab Experiment # 6/5
iii.
iv.
v.
vi.
vii.
viii.
ix.
x.
Frequency: The transponder frequency can be entered from the keypad.
Symbol Rate: The Symbol rate of the transponder can be entered from the
keypad.
Polarization: The Horizontal/Vertical polarization can be chosen (it modifies the
voltage of 14/18 volts). This voltage is used in this system to select the low/high
band of the LNB in the band Ku, or zero band in the LNB in band C.
Network Search: it can be enabled only if the Search Mode is set on Manual or
on Auto. In this case, if it is enabled, it can search the data of the transponder.
PID: it can be enabled only if the Search Mode is set on Advanced. In this case, if
it is enabled, Video PID, Audio PID and PCR PID can be entered from the
keypad.
FTA/Scrambled: Different types of search: FTA (Free-To-Air), CAS
(Conditional Access System) or FTA+CAS, can be selected.
Start Search: It will start the search.
LNB Setting: Selecting this option will directly lead to the Menu LNB setting.
c) SAT/TP Edit:
It enables to insert new satellites. It is sufficient to enter all the typical parameters
characterizing them: satellite name, frequency, symbol-rate, polarization etc.
d) Dish Setting:
This menu can also be used to set the used reception system: fixed (like in the trainer) or
motor-driven. For a fixed system, it is not necessary to set anything while for a motordriven system, follow these remarks:
i.
Save the data set in every passage by pressing the red pushbutton (F1) available
on the remote control.
ii.
The V- key of the remote control identifies the Eastwards direction while the V+
key identifies the Westwards direction.
iii. Before setting the antenna position, set the electric East and West Limits on this
menu.
a. East Limit: select the V- key of the remote control to turn the antenna to
the desired limit, and then press the red button (F1) to store this limit. The
stored figure will automatically become 1000. If the antenna is fixed, only
the red button must be pressed.
b. West Limit: select the V+ key of the remote control to turn the antenna to
the desired limit; then press the red button (F1) to store this limit. The
stored figure will exceed 1000. If the antenna is fixed, only the red button
must be pressed.
Radio Communications Lab
MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY, JAMSHORO
DEPARTMENT OF TELECOMMUNICATION ENGINEERING
SATELLITE COMMUNICATION (1st Term, Final Year)
Lab Experiment # 6/6
The position of the satellite can be set in two modes: Automatic or Manual setting.
Auto Setting: It consists in configuring the farthest satellite on the West, the central one, the
farthest satellite on the East, and the specific satellite that must be selected.
a) Farthest Satellite on the West: set Satellite Name, Frequency, Position dish (use
the keys V+/V- until the yellow line of signal quality is displayed), Align Dish (use
the V+/V- until the best quality of the signal is attained), Skew (polarization) and
save the data by pressing the red pushbutton (F1).
b) Central Satellite: the setting operations are same as those mentioned in (a).
c) Farthest Satellite on the East: the setting operations are same as those mentioned in
(a).
d) Specific Satellite: select the desired satellite included between the two farthest
satellites on the West and on the East, from the list and then save this data item with
the red button (F1). Thus the positions of all the satellites will automatically be
computed and stored.
Manual Setting: It consists of configuring each satellite.
a) Set the desired Satellite name, Frequency, Position dish (use the keys V+/V- until
the yellow line of signal quality is displayed), Align Dish (use the V+/V- until the
best quality of the signal is attained), Skew (polarization) and save the data by
pressing the red pushbutton (F1).
b) Selecting Service Search will enable the search of programs.
Programming the Analog Receiver:
After powering the Trainer, make sure that the analog receiver is on by pressing the ON key of
the remote control or the pushbutton PWR ON available on the central panel of the Trainer;
check that the analog display indicates a program (channel) “Cxxx”.
There are 500 stores available from C000 to C500. When any store is entered and the pushbutton
STORE of the remote control is pressed, each parameter previously selected or modified can be
stored. The remote control includes the necessary pushbuttons for programming the receiver. The
volume buttons select the parameter while the channel +/- buttons are used to modify the
selected parameter. The STORE button is used to store the data.
Radio Communications Lab
MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY, JAMSHORO
DEPARTMENT OF TELECOMMUNICATION ENGINEERING
SATELLITE COMMUNICATION (1st Term, Final Year)
Lab Experiment # 6/7
a) VIDEO:
It enables to program the following parameters:
i. Frequency
ii. Polarization: horizontal/vertical (H/V); it selects the low/high band (only for
the Ku band) in this system.
iii. Decoding: no decoding (nor), MAC, or clamped and filtered video (CLMP).
iv. Contrast: high (hi) or low (lo).
b) AUDIO:
It enables to program the following parameters:
i. Frequency: the frequency of the audio subcarrier can be selected.
ii. Audio modes: 50 µs (No 50), J17 (Nj17), DNR (Mdnr) or Stereo (St).
c) SYSTEM:
It enables to program the following parameters:
i. LNB: the LNB can be selected (from Lnb1 to Lnb8). All the following
parameters are associated (and stored) to the selected LNB).
ii. Frequency (LO): the frequency of the local oscillator can be programmed
from 9750 (9750) to 10600 (1.600).
iii. AFC: the automatic frequency control can (or cannot) be enabled.
iv. 22 Khz: the tone of 22KHz can (or cannot) be enabled. It is better to enable
it as it is not used in motor-driven systems.
v. DiSEqC: the standard DiSEqC can be selected between DiSEqC1 (dso1)
and DiSEqC4 (dso4) or it is not used (dso-).
vi. Reset: using this option (ReST) will store the factory parameters again.
Press the pushbuttons VOL+ and STORE; the indication ReST will start
blinking signaling that the parameters have been stored.
Radio Communications Lab
MEHRAN UNIVERSITY OF ENGINEERING AND TECHNOLOGY, JAMSHORO
DEPARTMENT OF TELECOMMUNICATION ENGINEERING
SATELLITE COMMUNICATION (1st Term, Final Year)
Lab Experiment # 6/8
TEST RESULTS
 Perform the above procedure. List the options which were not changeable by you during
the programming. Find out the reasons.
QUESTIONS
Q. #1: Why is the SKEW signal used?
Answer:
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Q. #2: What are the two frequencies of the dual-band Ku LNB?
Answer:
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Q. #3: What are the different search types available?
Answer:
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Q. #4: What does PID stand for?
Answer:
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FINAL CHECKLIST
 Submit your answers to questions before the next laboratory.
Radio Communications Lab