UNAOHM DG-OHM Compact User manual




UNAOHM S.r.l. - Via G. di Vittorio 49 - 20068 Peschiera Borromeo (MI) Italy
Tel. [phone] - Fax [phone] - Web : www.unaohm.it - E-mail : [email protected]


DG-OHM UNAOHM Srl Rev. 4.0 1
TABLE OF CONTENTS
1 GENERAL WARNINGS 3
1.1 WARNINGS 3
1.2 PRECAUTIONS 4
1.3 MAINTENANCE 4
1.4 NOTES 4
2 INTRODUCTION 5
2.1 METHOD OF USE 5
2.2 MAIN CHARACTERISTICS 6
2.3 MECHANICAL CHARACTERISTICS 6
3.0 TECHNICAL SPECIFICATIONS 7
3.1 SUPPLIED ACCESSORIES 7
3.2 OPTIONAL ACCESSORIES 7
4 KEYBOARD 8
4.1 STATUS BAR 8
5 INSTRUCTIONS FOR USE 9
5.1 POWER 9
5.2 START-UP AND SHUT DOWN 9
5.3 BATTERY USE 9
5.4 PREPARATION FOR START-UP 9
6.0 TUNING 10
6.1 TERRESTRIAL TUNING 10
6.2 SATELLITE TUNING 10
6.2.1 AUTOMATIC SATELLITE TUNING FOR TRANSPONDER 11
6.2.2 MANUAL SATELLITE TUNING 11
7.0 ATTENUATOR 12
8.0 MENU 13
8.1 MAIN MENU 13
8.2 DIGITAL MENU 13
8.3 TV MENU 13
8.4 DiSEqC MENU 14
8.5 PROGRAMME MENU 14
8.6 LNB MENU 14
8.7 DATA LOGGER MENU 14
9.0 TERRESTRIAL ANTENNA INSTALLATION 15
9.1 POINTING 15
9.2 OPTIMISATION 16
9.3 TV PICTURES 17

DG-OHM UNAOHM Srl Rev. 4.0 2
10.0 SATELLITE DISH INSTALLATION 18
10.1 POINTING 18
10.2 OPTIMISATION 19
10.3 TV PICTURES 19
11.0 SPECIAL FUNCTIONS: 20
11.1 3 IN 1 FUNCTION 20
11.2 CONSTELLATION 20
11.3 AER (ECHOES ANALYSIS FOR DIGITAL TERRESTRIAL) 21
11.4 CLC FUNCTION (LENGTH CALCULATION FROM
CABLE FAULT POINT) 22
11.5 DiSEqC SCR FUNCTION 23
11.6 dCSS FUNCTION 25
11.7 LTE 27
11.8 LTE FILTER TEST 27
11.9 TEST MULTISWITCH 28
12.0 PROGRAMME MEMORIES 29
12.1 SAVING PROGRAMME MEMORIES 29
12.2 PROGRAMME TABLE 29
12.3 PROGRAMME RECALL 30
13.0 DATA LOGGER 31
13.1 INSTANT DATA LOGGER 31
13.2 UHF DATA LOGGER 31
13.3 SATELLITE DATA LOGGER 32
14.0 FIRMWARE UPDATE VIA PC 33
15.0 WARRANTY 35

DG-OHM UNAOHM Srl Rev. 4.0 3
1 GENERAL WARNINGS
MARKING
This equipment is in conformity with the following standards and documents:
 ELECTROMAGNETIC COMPATIBILITY (EMC) EN55011, EN61000-3-2, EN61000-3-3,
EN61000-4-2, EN61000-4-3, EN61000-4-4, EN61000-4-5, EN61000-4-8, EN61000-4-11,
ENV50204
 SAFETY EN61010-1
ATTENTION: The safety standards and precautions listed below must be applied
scrupulously during all phases of use and maintenance of the instrument in order to prevent
damage to persons, animals and objects.
NOTE: UNAOHM S.r.l. will not be liable for any incorrect use of the instrument or any use
other than that specified.
1.1 WARNINGS
 Power the instrument with a voltage which falls within the limits specified in the
characteristics.
 Do not use the equipment without the relative locks.
 The instrument has been designed for use in covered areas. Therefore do not expose it to
rain or dripping.
 Do not use the equipment in an explosive atmosphere constituted by flammable gases,
vapours, smoke and powders.
 The instrument can be used in overvoltage Category IIa and pollution grade 2.
 Do not turn on the equipment immediately after moving it from a very cold area to a very
hot area in order to avoid formation of condensation.
 Do not obstruct any cooling slots and do not place the equipment close to heat sources.
 For prolonged use in the laboratory or in fixed stations, we recommend removing the
equipment from the bag for transport in order to allow greater heat dissipation.
 Do not apply DC voltage or RF signals greater than those prescribed to the input
connectors.
 We recommend periodically inspecting the transportation strap, relative attachments and
clasps which could become damaged with use. Replace these as soon as signs of wear
are detected.
 For equipment with battery installed remember:
1° ) Never short circuit the battery. It could explode.
2° ) Never submerge the battery in water or throw it in a fire.
3° ) Never bore a hole in or attempt to open the battery.
4° ) If it must be replaced, use original UNAOHM batteries and dispose of the old battery
in appropriate containers.
5° ) Never connect the battery with inverted polarity.

DG-OHM UNAOHM Srl Rev. 4.0 4
1.2 PRECAUTIONS
 The liquid in the monitor is harmful. In the event the module breaks with possible leakage
of the liquid, we recommend not touching it with your hands or other parts of the body,
particularly with the eyes or mouth. As a precaution immediately wash with water and soap.
 Do not expose the LCD monitor to direct sunlight for an extended period of time or to
intense ultraviolet rays. These can deteriorate it.
 Keep the equipment in a location with temperatures higher than the minimum prescribed
for storage. Otherwise the liquid in the crystal will solidify causing damage to the monitor.
The same goes for temperatures higher than the maximum; the liquid in the crystal returns
to the isotropic state and this process is not reversible.
 One of the most frequent causes for technical support intervention is internal short circuits
due to foreign bodies, even very small ones, which enter the equipment despite all of the
measures taken to prevent this possibility. It is therefore recommended, in particular when
joining coaxial cables, not to do so in the immediate vicinity of the equipment because even
very small pieces of the mesh shielding could penetrate the equipment and cause
occasional short circuits which are not easily detected by technical support engineers.
1.3 MAINTENANCE
Opening the instrument and any operations must be done exclusively by UNAOHM qualified
personnel or at authorised service centres having basic electro-technical and electrical safety
knowledge.
 Before intervening disconnect the power cable.
 For the units equipped with a battery remember the notes included in section 1.1.
 Be careful not to come into contract with circuits which, even though not powered, still
maintain an electrical charge (condensers).
 Use suitable measures against accumulation of electrostatic charges. Do not touch circuits
inside the equipment without first putting on an appropriate antistatic strap.
 To clean the external parts:
1° Remove the power supply cable.
2° Use soft cloths. Use non-aggressive detergents and do not use hydrocarbon based
substances.
3° Do not allow liquids or other substances to penetrate inside the instrument.
1.4 NOTES
 Some fixed or less bright points (pixels) may remain on the LCD monitor screen. This is to
be considered normal and falls within the production tolerances of the monitor
manufacturer.
 The specified explanations are understood to be with the equipment at running
temperature (in other words, 10 minutes after start up).
 Do not drop the equipment or subject it to strong shocks. If the instrument is transported in
a vehicle, place it on a non-rigid support in order to avoid strong vibrations.
 Before using the instrument read the instructions contained in this user manual carefully.

DG-OHM UNAOHM Srl Rev. 4.0 5
 The instrument may operate, besides in a horizontal position, also in a vertical position,
resting on the bottom.
 It is strongly recommended to regularly perform (at least annually) the periodic functional
test on the instrument, accompanied by any necessary calibration.
We also recommend replacing worn straps or bags to prevent accidents as indicated in the
previous paragraph 1.1.
2 INTRODUCTION
The DG-OHM Compact is the UNAOHM model which best meets installer requirements of
size, weight, and ease of use, while at the same time faithfully maintaining UNAOHM
performance (real time continuous coverage 45 – 2.250 MHz spectrum analyzer).
The DG-OHM Compact is available in the following configurations:
√ DG-OHM HD (DVB-T + DVB-S/S2 + MPEG4)
√ DG-OHM FULL HD (DVB-T/T2 + DVB-C + DVB-S/S2 + MPEG4)
Digital configuration table:
DG-OHM DVB-T DVB-T2 DVB-C DVB-S
DVB-S2
PICTURES + NIT
MPEG2 / MPEG4
FULL HD OK OK OK OK OK
HD OK * * OK OK
* = UPGRADABLE LATER
2.1 METHOD OF USE.
The DG-OHM Compact model has been designed to meet the needs of different installers.
Installers with less requirements prefer direct, quick and easy use, using AUTOMATIC mode.
Installers with more specific requirements can also use this instrument in manual mode, with
the possibility of manually modifying or setting all parameters.
Automatic operating mode (standard mode):
 terrestrial navigation: automatic tuning of frequency directly for channels
 satellite navigation: direct recall tuning of pre-stored transponders with a full list of
associated satellites and transponders
Professional operating mode (user mode):
The user can manually set all parameters including frequency, LNB voltage, Local Oscillators,
digital parameters, etc.

DG-OHM UNAOHM Srl Rev. 4.0 6
2.2 MAIN CHARACTERISTICS
Spectrum analyzer: real time total coverage from 45 to 2250 MHz
Digital measurements: BER, MER, NM, etc. for standard digital DVB-T/T2, DVB-C, DVB-
S/S2
Clear SD and HD picture viewing
Constellation diagram
LTE function: LTE signal interference analysis toward DVB-T channels.
TP SAT function: automatic direct recall tuning of transponders.
AER function: echoes analysis for terrestrial signals.
CLC function: cable length calculation from the fault point (in combination with external noise
generator).
DATA LOGGER function: instant, UHF, Satellite.
Diseqc: 1.1, 1.2(motor), 2.0, SCR.
2.3 MECHANICAL CHARACTERISTICS
Holder: ABS polymer
Innovative solutions:
 multi-function tilting cover:
o Closed: used for protection during transport.
o Adjustable opening: to further protect from sunlight.
o Flap opening: as a pedestal for secure support.
 transport strap for safe use with hands free.
 side handle for transport and safe handling.
Monitor: Professional colour 5.7" LCD with wide viewing angle and back light control
Weight: less than 2 Kg
Size (cm): 24(L) x 16(A) x 9(P)
Li-Ion battery autonomy: autonomy over 5 hours, fully charged in 4 hours
USB port: PC connection for firmware updates and download of measurements stored with
the data logger (also with any software for remote control)
RCA video input: to test decoder and video camera video signals.

DG-OHM UNAOHM Srl Rev. 4.0 7
3.0 TECHNICAL SPECIFICATIONS
Characteristic DG-OHM HD DG-OHM FULL HD
Real time spectrum analyzer
Frequency band 45 – 2250 MHz 45 – 2250 MHz
DVB-T
DVB-T2 -
DVB-H
DVB-C -
DVB-S
DVB-S2
MPEG4
MPEG2
NIT
Constellation diagram
DiSEqC 1.1, 1.2, 2.0 1.1, 1.2, 2.0
SCR
LTE analysis
Echoes analysis
Data Logger
Length calculation from the cable fault
point
Automatic terrestrial channel search
USB port
5.7’’ colour high brightness LCD
Dimensions 24 x 16 x 9 cm 24 x 16 x 9 cm
Weight 2 kg 2 kg
Li-Ion battery autonomy 5h 5h
Measurement precision ± 1.5 dB ± 1.5 dB
Voltage supplied by BNC 0V, 13V, 18V 0V, 13V, 18V
Attenuator auto / man step 10dB auto / man step 10dB
3.1 SUPPLIED ACCESSORIES
1 External network power supply.
1 Li-Ion 4.5 Ah battery.
1 Instructions manual
1 Instrument container case.
3.2 OPTIONAL ACCESSORIES
NG 500 External noise generator.
FCV 300 2-3 GHz Down converter.
Professional transport carrying case.

DG-OHM UNAOHM Srl Rev. 4.0 8
4 KEYBOARD
Button Single Press Press and Hold
Spectrum Modifies spectrum expansion
Activates frequency entering Changes frequency increase digit
Digital measurements OFDM / QAM selection (for FULL HD only)
Stored programme recall Programme table
NIT download and picture viewing TV menu
3 in 1: spectrum, digital measurements
and NIT
On the digital screen, stores instant
measurements and, in spectrum, opens
Data Logger
Activates modifications of terrestrial CH
and satellite TP Switches terrestrial / satellite band
Sends DiSEqC command DiSEqC menu
Activates side menu Activates main menu
LNB On/Off and voltage regulation Menu with LNB settings
In spectrum, increases attenuation and
in menus, moves the cursor ---------
In spectrum, decreases frequency and
channel and, in menus, modifies options Fast decrease
Confirms selection Adjustments menu
In spectrum, increases frequency and
channel and, in menus, modifies options Fast increase
In spectrum, decreases attenuation and
in menus, moves the cursor Automatic attenuator
--------- Instrument On/Off
4.1 STATUS BAR
The status bar at the bottom of the screen superimposes all main information for constant
viewing. You can make it transparent in TV pictures mode by simply pressing (single click) the
button and modifying the BLACK or TRANSPARENT choice in the box.
In addition, the status bar will change colour depending on the environment to be measured:
1. Red: power measurements for digital terrestrial.
2. Green: level measurement (CHBW: 1 MHz) for terrestrial band analogue signals.
3. Light blue: level measurements for satellite band analogue signals.
4. Blue: power measurements for digital satellite.
Frequency Channel/tpsat programmes Power/level Vcc (voltage) ATT
698.00 49 03 86.6 -- 20

DG-OHM UNAOHM Srl Rev. 4.0 9
5 INSTRUCTIONS FOR USE
5.1 POWER
The DG-OHM Compact can be powered 3 ways:
 voltage alternating from 90V to 260V by means of included external power supply
 Li-Ion battery which, when fully charged, has an autonomy of more than 5 hours
 external continuous voltage between 11.5V and 15V with current of at least 3A
5.2 START-UP AND SHUT DOWN
The instrument turns on and off by holding down the button for a few seconds.
5.3 BATTERY USE
The battery charges while the instrument is in stand-by with the power on.
2 LEDs which switch on depending on charging conditions are found on the front of the
instrument, above the button:
 red LED on: instrument off with charging battery
 green LED on: instrument off with battery fully charged
 LED off: instrument on
Some important notes on battery use:
 Before using new batteries, it is a good idea to perform three complete charging and
discharging cycles.
 To view the battery charge status and therefore residual autonomy, see the battery icon on
the upper left of the screen. When the battery charge is low, the icon will become red
before the instrument switches off. At this point, we recommend interrupting use of the
instrument and recharging the battery as soon as possible. If you continue to use the
instrument (5 - 10 minutes max), the instrument will switch off.
 When the equipment remains inactive for long periods, we recommend charging the
battery at least once a month to prevent deterioration.
 We recommend switching on the instrument at least once a month for a few hours.
5.4 PREPARATION FOR START-UP
Upon start-up, the instrument returns to the same conditions of use at the last shut down if it
was shut down using the button, with the following exceptions:
 Power supply voltage (for safety reasons) in output from the input connector RF IN is
always excluded whenever TPSAT is not used.
 The measurement status of the digital sections QPSK , OFDM or QAM is not restored.
Each time a button is pressed a short acoustic tone is heard in confirmation of the operation.
To mute the "beep," press the button, position the cursor on BUZZER and select OFF.

DG-OHM UNAOHM Srl Rev. 4.0 10
6.0 TUNING
6.1 TERRESTRIAL TUNING
Terrestrial tuning can be carried out by frequency, channel or programme. In order to select a
mode press the corresponding button:
1. Single click the button to activate the programme mode, allowing navigation (by
means of the buttons or setting a number from the numeric keypad) by
programme.
2. Single click the button to activate the channel mode, allowing navigation (by
means of the buttons or setting a number from the numeric keypad) by channel.
3. Single click the button to activate the frequency mode, allowing navigation (by
means of the buttons or setting a number from the numeric keypad) by
frequency.
Regardless which mode has been selected, when you directly set a frequency, channel or
programme, when the relative button is pressed, the message "123" will appear on the upper
left of the screen to alert the user that he can select the numerical value by means of the
keyboard, which has now been transformed into a numeric keypad, and then confirm with the
OK button.
It is also possible to tune the frequency setting simply by modifying the digit or step
(thousands, hundreds, tens, units, tenths, hundredths of MHz) of increase or decrease.
To modify the step: press and hold the button, position the cursor on the digit to be
modified with the buttons, confirm the step to be modified with the OK button, modify
the digit using the buttons.
6.2 SATELLITE TUNING
Satellite tuning can be carried out by frequency, transponder (TP-SAT) or programme. In
order to select a mode press the corresponding button:
1. Single click the button to activate the programme mode, allowing navigation (by
means of the buttons or setting a number from the numeric keypad) by
programme.
2. Single click the button to activate the transponder (TP-SAT)mode, allowing
navigation (with the buttons), directly recalling all transponder settings (L.O.
frequency, high or low band polarity, digital parameters).
3. Single click the button to activate the frequency mode, allowing navigation (by
means of the buttons or setting a number from the numeric keypad) by
frequency.

DG-OHM UNAOHM Srl Rev. 4.0 11
Regardless which mode has been selected, tuning is to be carried out with the
increase or decrease keys. Otherwise, set values using the numerical keypad, confirming with
the OK button.
6.2.1 AUTOMATIC SATELLITE TUNING FOR TRANSPONDER (TPSAT function)
TRANSPONDER tuning (automatic mode) provides HOT BIRD 13° EST satellite as a default
setting.
Should the need arise to change the satellite on which you are navigating in automatic mode,
proceed as follows:
1. press and hold the button to activate the TV menu
2. press OK on "Satellite"
3. move the cursor using the buttons on the satellite to be selected and press OK
4. Single click on the button to exit from the TV menu.
5. In this way, the instrument will return to spectrum analyzer mode, allowing navigation by
transponder, by means of the (increase and decrease) keys of the previously
selected satellite (the symbol √ will indicate the selected satellite).
TV MENU
SATELLITE Eutelsat 16 E
TAB. CHANNELS √ Hot bird 13 E
LTE Astra 19.2 E
SOURCE Hellas
………..
…………
6.2.2 MANUAL SATELLITE TUNING
Alternatively, you can use the manual (professional mode) procedure to enter the following
parameters:
1. Local oscillator: from the spectrum analyzer mode ( ), single click on the
button to activate the side menus. Select the last box; press OK to select modify. Use
the (increase and decrease) buttons to modify the setting:
 OL1, to set low satellite band frequencies (frequencies lower than 11750).
 OL2, to set high satellite band frequencies (frequencies exceeding 11750).
 IF, to set satellite frequencies converted in IF (from 900 to 2250).
2. Frequency: press the button. The message "123" will appear on the upper left of
the screen to alert the user that he can enter the frequency value with the keyboard,
which has now been transformed into a numeric keypad, or else with the
increase and decrease buttons.
It is also possible to tune the frequency setting simply by modifying the digit or increase
or decrease step (thousands, hundreds, tens, units, tenths, hundredths of MHz).

DG-OHM UNAOHM Srl Rev. 4.0 12
To modify the increase step: press and hold the button, position the cursor on the
digit to be modified with the buttons, confirm the step to be modified with the OK
button, modify the digit using the buttons.
3. Satellite polarity: single press the button to activate or deactivate output voltage
and make the Vcc camp active in the status bar, which will flash.
Use the increase and decrease keys to select the 4 polarities:
 VL vertical low (13Volt)
 HL horizontal low (18 Volt)
 VH vertical high (13Volt + 22KHz).
 HH horizontal high (18Volt + 22KHz).
(ATTENTION: in terrestrial, voltages 0Volt, 13Volt, 18Volt will be enabled to power external
devices such as pole control units, etc.)
4. Symbol rate: from the digital screen, single click on the button to activate the side
menu. Select the PARAMETERS box. Using the (up, down) buttons, press ;
the cursor will move to SYMB. R.. Subsequently, press to move the cursor to the
right on the numerical value of the symbol rate and, using the keyboard which has
converted into a numerical keypad, you can enter the value of the new symbol rate.
7.0 ATTENUATOR
If the signals measured by the MARKER exceed or are less than the values detected by the
instrument in its current conditions, this situation will be signalled with the appearance of a >
(greater than) or < (less than) symbol, indicating the need to insert or remove attenuation cells
allow correct reading of the signal level or power.
It is possible to manually act on attenuators using the following keys:
1. : ATT+ : will add an attenuation cells at steps of 10 db
2. : ATT+ : will remove attenuation cells at steps of 10 db
It is, however, possible to use the AUTOMATIC ATTENUATOR. This activation will enable
the instrument to automatically calculate the attenuation cell to measure level or power. To
activate, press and hold the button from spectrum analyzer mode.
The attenuation cell value will be indicated in the status bar under ATT.

DG-OHM UNAOHM Srl Rev. 4.0 13
STATUS BAR:
Frequency Channel/tpsat programmes Power/level Vcc (voltage) ATT
698.00 49 03 86.6 -- 20
8.0 MENU
Some buttons, when pressed and held, activate a menu relative to the button which permits
further operations to be performed.
8.1 MAIN MENU
Press and hold the (menu) button to activate the main menu.
MAIN MENU
Configuration Displays all information on SW versions, HW components present, S/N, etc.
Loc. Oscillator Permits the setting of pre-defined L.O. or USER L.O.
Language Language selection (Italian, English, French, German, Spanish)
Buzzer Activates or deactivates the beep heard when keys are pressed
Spectrum Sets the spectrum as: classic, line, combined
8.2 DIGITAL MENU
Press and hold the (digital measurements) button to activate the selection menu.
MODE
OFDM Activates the COFDM board for DVB-T; DVB-TS (full hd only) digital terrestrial measurements.
QAM Activates the QAM board for DVB-C (full hd only) for digital measurements via cable.
8.3 TV MENU
Press and hold the (TV) button to activate the selection menu.
TV
Satellite Displays satellite list (TPSAT) in order to select the one that will be used in SAT mode.
Channels table To view and select the suitable channel table (Italy default)
LTE Activates specific LTE function to better control filter functionality and the coexistence of
digital terrestrial signals with LTE signals.
Source Allows the selection of video input for decoder testing or EXT video camera selection.

DG-OHM UNAOHM Srl Rev. 4.0 14
8.4 DiSEqC MENU
Press and hold the (DSQ) button to activate the DiSEqC menu.
DiSEqC MENU
2 way DiSEqC Sets and transmits commands to switch DiSEqC on 2 satellites.
4 way DiSEqC Sets and transmits commands to switch DiSEqC on 4 satellites.
DiSEqC Level Sets the DiSEqC level between: 1.0 , 1.1 , 2.0
List Opens the DiSEqC list with all available commands
Motor 1.2 Allows the user to move, drive or manage a DiSEqC motor.
DiSEqC SCR Activates the SCR function for control of the LNB SCR
DiSEqC is a registered trademark of EUTELSAT.
8.5 PROGRAMME MENU
Press and hold the (PR) button to activate the programme management menu.
8.6 LNB MENU
Press and hold the (LNB) button to activate the selection menu.
LNB
Step Sets the 4 polarities for driving the LNB (VH, VL, HH, HL)
Amperes Activates amperometric mode: measures absorption of devices connected to the BNC
Auto recovery Automatic function for short-circuit resolution
8.7 DATA LOGGER MENU
Press and hold the button to activate the selection menu.
DATA LOGGER
Instant Allows viewing of instant measurements
UHF Allows start-up or viewing of the UHF DATA LOGGER (from CH 21 to CH 60)
Satellite Allows start-up or viewing of the Satellite DATA LOGGER (for the stored TPSAT)

DG-OHM UNAOHM Srl Rev. 4.0 15
9.0 TERRESTRIAL ANTENNA INSTALLATION
The pointing of a terrestrial antenna must be carried out in 3 different phases:
1. POINTING (phase 1 button)
2. OPTIMISATION (phase 2 button)
3. CLEAR NIT AND TV PICTURES VIEWING (phase 3 button)
To help better remember the order of the three phases, please note that the numbers
associated with the button precisely follow the order of the phases.
9.1 POINTING (phase 1 button)
The first pointing phase has the task of identifying the direction from which digital
terrestrial signals are received and, at the same time, thanks to the spectrum in real time,
to search for the antenna position that will get the most amount of signals, or rather the
most power.
The field meter must be set to spectrum analyzer mode, , initially entering the FULL
spectrum viewing mode (press to change from SPAN to FULL). This will allow us to
pinpoint the location of the repeater.
Next, select a specific channel, to be chosen from the importance of MUX content (paid
channels or guaranteed channels such as RAI, Mediaset) or choose another low quality
channel. In the latter case, obviously improving the quality of a poor quality MUX, other
channels arriving from the same direction can benefit or at least not suffer. The fact
remains that, in many cases, pointing is also a position compromise that must meet the
requirements of the involved MUX.
Once a channel or specific MUX has been set, you will need to modify the SPAN. Press
and hold the button to set SPAN from FULL to 5-6-7 as preferred. This operation will
allow us to zoom in on the signal to improve its pointing.
In fact, by means of small movements on the antenna, you can try to get a MUX that is
powerful and squared. This operation will allow us to perform pointing for the most power
possible.
Picture of the real time spectrum analyzer representing the captured MUX.

DG-OHM UNAOHM Srl Rev. 4.0 16
9.2 OPTIMISATION (phase 2 button)
Once the first phase of pointing to maximum power has been performed, now we have to
carry out a second step to optimise the quality. In fact, for digital signals, we do not always
improve the quality with quantity; this is why we carry out pointing for the quantity and
then, later, optimisation for quality.
Press the button to activate the COFDM board, which will perform BER, MER, etc.
quality measurements. In this phase, we will have to make small movements on the
antenna to find the position that guarantees the best BER, MER and NM.
Digital signal quality is highlighted not only in numbers (ex. 1 e- 5, meaning error out of
100,000 symbols), but also through the quality bar image which will get longer as quality
improves, or which will become shorter as quality gets worse, until the signal is so
degraded in quality that it will give the "NO CARR" or UNLOCKED" message, or the
complete absence of quality.
In addition, the quality measurement bars can light up three different colours to give an
immediate idea of the quality:
 GREEN optimal condition of errors (few)
 YELLOW fair condition / some errors
 RED critical condition of errors
Once signal quality has been optimised, our quantity may have decreased, but this will not
influence our situation negatively.
Picture of the terrestrial digital screen button.
LOCKED: SIGNAL LOCKED ON
UNLOCKED / NO CARR: SIGNAL NOT LOCKED ON : due to poor quality or absence of
signal, no TV pictures can be seen.
Ch BER: BER channel measurement (bit error ratio, or rather the number of
bit errors over time).
Pv BER: Post Viterbi BER measurement (bit errors over time after the
correction of Viterbi).
MER: Modulation error ratio (errors on modulation)
NM: Noise Margin (guarantee margin in dB).
CELL: Recognition code of the repeater from which the signal is being
received.
RU: Uncorrected errors.

DG-OHM UNAOHM Srl Rev. 4.0 17
9.3 CLEAR NIT AND TV PICTURES VIEWING (phase 3 button)
Once phase 2 has been completed and, therefore, the best quality and quantity signal has
been obtained, simply press the button to activate the MPEG4 board, which will
communicate the N.I.T. network information table (list of channels contained in the MUX) and
will allow for selection of a television broadcaster to display clear pictures.
In NIT mode, press the button (single click), select TRASPARENT mode to have the
words superimposed on the pictures, or select BLACK to have the black background with no
images behind.
To select the viewing of a television broadcaster, from the NIT screen, simply use the
button to move and then single press the button to see the clear digital pictures.
Clear digital terrestrial TV mode picture
From the digital TV screen, press the button to recall the side menus which will allow:
STATUS B. Status bar management: Activates/deactivates (full screen viewing)
CHANNEL INFO Select the broadcaster and relative information: channel name, video
PID, audio PID
AUDIO To select audio for that channel
DIGITAL MEASUREMENTS View the main digital measurements together with pictures
Management of adjustments such as brightness, contrast, volume by pressing and holding
the button which will activate the control bars.
Use the keys to select the various settings:
 VOLUME (only in TV mode)
 CONTRAST
 BRIGHTNESS
Use the keys to increase or decrease relative contents.

DG-OHM UNAOHM Srl Rev. 4.0 18
10.0 SATELLITE DISH INSTALLATION
The pointing of a satellite antenna must be carried out in 3 different phases:
1. POINTING (phase 1 button)
2. OPTIMISATION (phase 2 button)
3. CLEAR NIT AND TV PICTURES VIEWING (phase 3 button)
To help better remember the order of the three phases, please note that the numbers
associated with the button precisely follow the order of the phases.
Press and hold the button to switch from terrestrial to satellite and vice versa.
Once you have switched to the satellite range (BLUE status bar), the pre-stored
TRANSPONDERS will already be active in the status bar.
Press the key to select the desired Transponder.
10.1 POINTING (phase 1 button)
Set a SPAN value, press and hold the button to obtain a zoom on a specific signal.
Now, simply position the satellite dish with elevation appropriate to the location.
Next, move the satellite dish horizontally to capture the searched satellite.
Thanks to the REAL TIME SPECTRUM, you will simply need to move the satellite dish
horizontally until the MARKER positions in the middle of the received signal, as shown below.
In this situation, the TP will not necessarily be exactly the desired satellite, because there may
be TP with parameters similar to ours but of other orbital positions.
Therefore, once you are in the above-indicated situation, make sure that the signal is
LOCKED, pressing the button.
If the signal locks, regardless of the quality (but without RU) press the button, which will
download the NIT and, in particular, the orbital position that we are going to compare with the
one in question.
If they match, we have pointed the right satellite. Next, we will have to carry out an
optimisation phase to obtain the best quality.

DG-OHM UNAOHM Srl Rev. 4.0 19
10.2 OPTIMISATION (phase 2 button)
After verification of the correct satellite dish position by reading the orbital position from the
NIT, we will need to optimise signal quality, to ensure viewing even in critical conditions, by
slightly moving the dish.
Digital satellite screen picture.
LOCKED: SIGNAL LOCKED ON
UNLOCKED / NO CARR: SIGNAL NOT LOCKED ON : due to poor quality or absence of
signal, no TV pictures can be seen.
Ch BER: BER channel measurement (bit error ratio, or rather the number of
bit errors over time).
Pv BER: Post Viterbi BER measurement (bit errors over time after the
correction of Viterbi).
MER: Modulation error ratio (errors on modulation)
NM: Noise Margin (guarantee margin in dB).
CFO: Central frequency offset (indicates the conversion error of the LNB
local oscillators).
10.3 CLEAR NIT AND TV PICTURES VIEWING (phase 3 button)
Once phase 2 has been completed and, therefore, the best quality and quantity signal has
been obtained, simply press the button to activate the MPEG4 board, which will
communicate the N.I.T. network information table and will allow for selection of a television
broadcaster to display clear pictures (see paragraph 9.3).