Televes MTD 120 User Manual
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Televes MTD 120 User Manual

Televes MTD 120 User Manual

Tv & sat level meter
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MTD 120
(Color)
Ref. 4202
Ref. 4207
(B/N)--
BER
(Bit Error Rate)
TV & SAT Level Meter
User´s manual

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Summary of Contents for Televes MTD 120

  • Page 1 MTD 120 (Color) Ref. 4202 Ref. 4207 (B/N)-- (Bit Error Rate) TV & SAT Level Meter User´s manual...

  • Page 2: Table Of Contents

    TV & SAT Level Meter MTD 120 User Manual INDEX ..........................Page 1.- GENERAL .............................. 1.1.- Description ............................. 1.2.- Specifications ..........................2.- SAFETY RULES ............................. 3.- INSTALLATION ............................3.1.- Power Supply ..........................3.1.1.- Operation using the External DC Adapter ................
  • Page 3 TV & SAT Level Meter MTD 120 User Manual 4.9.2.15.- Search Level ......................4.9.2.16.- Teletext ........................4.9.2.17.- DiSEqC Command Generator ................... 4.9.2.18.- Beep ........................... 4.9.2.19.- Equipment Information ....................4.9.2.20.- Exit ..........................4.10.- Spectrum Analyser Operating Mode ................... 4.10.1.- Spectrum Analyser Mode Functions Menu ................

  • Page 4: General

    The range of frequencies covered, from 5 to 862 MHz and from 920 to 2150 MHz, makes MTD 120 an excellent instrument for FM radio, terrestrial TV, cable TV (CATV, 'Community Antenna Television', where the subband tuning margin, from 5 to 45 MHz, enables the user to carry out tests on the return channel), satellite TV, MMDS microwave links, VSAT ('Very Small Aperture Terminal') systems, digital TV and intermediate frequency analysis (38.9 MHz).

  • Page 5: Specifications

    TV & SAT Level Meter MTD 120 User Manual 1.2.- Specifications TUNING Digital frequency synthesis. Continuous tuning from 5 to 862 MHz and from 920 to 2150 MHz Tuning modes Frequency, Channel or Memory. Channel plan configurable on demand Resolution...
  • Page 6 TV & SAT Level Meter MTD 120 User Manual DCI FUNCTION DVB Channel Identifier. It provides information about the channel we are making the measurement. QAM SIGNAL PARAMETERS Demodulation 16 / 32 / 64 / 128 / 256 QAM Symbol rate...
  • Page 7 TV & SAT Level Meter MTD 120 User Manual MONITOR DISPLAY Monitor LCD colour 4 inches (ref. 4202) Black & White 4 1/2 inches (ref. 4207) Colour system PAL, SECAM and NTSC TV standard M, N, B, G, I, D, K and L...
  • Page 8 TV & SAT Level Meter MTD 120 User Manual MECHANICAL FEATURES Dimensions 280 (W) x 95 (H) x 250 (D) mm Weight 5,2 kg INCLUDED ACCESSORIES Rechargeable battery 6 V, 3.3 Ah "F"/F-BNC/F adapter "F"/F-"DIN"/F adapter "F"/F-"F"/F adapter External DC adapter Carrying bag NOTE: BER measurement options of QPSK, QAM or COFDM modulated signals vary based on the model of used Measurer.

  • Page 9: Safety Rules

    TV & SAT Level Meter MTD 120 User Manual 2.- SAFETY RULES * Use this equipment connected only to systems with their negative of measurement connected to ground potential. * The external DC adapter is a Class I equipment, for safety reasons plug it to a supply line with the corresponding ground terminal.

  • Page 10: Installation

    3.- INSTALLATION 3.1.- Power Supply The MTD 120 is a portable instrument powered by two 6 V - 3.3 Ah lead acid batteries. There is also an external DC adapter provided for mains connection and battery charging. 3.1.1.- Operation using the External DC Adapter Connect the external DC adapter to EXT.

  • Page 11: Operating Instructions

    TV & SAT Level Meter MTD 120 User Manual 4.- OPERATING INSTRUCTIONS 4.1.- Description of the Controls and Elements SPECT LEVEL MODE ENTER MONITOR CH/F SEARCH MEMORY SOUND SCREEN SHIFT EXT VIDEO DRAIN BATTERY OK CHARGER Medidor de Campo Color TV&SAT MTD 120 Figure 1.- Front panel.
  • Page 12 TV & SAT Level Meter MTD 120 User Manual System & Standard Selects the colour system (PAL, SECAM or NTSC) and the TV standard (B/G, D/K, I, L, M, N or Digital). Battery & Lnb Displays battery voltage and external units power supply voltage and current (V Lnb and I Lnb).
  • Page 13 Battery charge level indicator. [9] DRAIN. External units power supply indicator. Lights up when the MTD 120 supplies a current to the external unit. [10] EXT VIDEO. It lights up when an external video signal is present through the SCART connector [39].
  • Page 14 [37] Connector RS-232C Enables the remote control of the MTD 120 from a personal computer, as well as data dumping to a printer. [38] External 12 V power supply input [39] Scart socket...

  • Page 15: Adjustment Of Volume And Monitor Parameters

    ENTER [5]. 4.3.- Selecting the Operation Mode: TV / Spectrum Analyser The MTD 120 has two basic operation modes: TV and Spectrum Analyser. To switch from one operation mode to the other press key SPECT [21]. In the TV operation mode the demodulated television signal is shown on-screen; this is the default operation mode, various functions can be selected, as shown in the following paragraphs.

  • Page 16: External Units Power Supply (Ext. Supply)

    User Manual 4.8.- External Units Power Supply (EXT. SUPPLY) The MTD 120 can supply the voltage needed to power the external units (antenna preamplifiers, in the case of terrestrial TV, or LNB, in the case of satellite TV). Maximum input levels...

  • Page 17: Tv Operating Mode

    TV & SAT Level Meter MTD 120 User Manual 4.9.- TV Operating Mode 4.9.1.- Selecting the Measurement Mode (MEASURE) The types of measurements available depend on the band, the standard, the operating mode and the options included in the appliance.

  • Page 18: Measuring The Video Carrier Level (Level)

    4.9.1.1.2.- Selecting TV Mode: TV, LV, SY (TV MODE) In addition to operating as a television set, the monitor of the MTD 120 can act as an analogue level indicator, and can display the line synchronising pulse just as it would appear on a screen of an oscilloscope.

  • Page 19: Measuring The Video / Audio Ratio (V/A)

    TV & SAT Level Meter MTD 120 User Manual The operation modes available are: Monitor operating as a conventional television set. TV+LV: Monitor operating as a conventional television set, with a level indicator on the upper part of the screen (the analogue bar).

  • Page 20: Measuring The Carrier / Noise Ratio (C/N)

    MHz and with two decimals figures. This frequency also can be modified in the Spectrum operation mode (see 4.10.2.2. C/N (Referenced Measurement). The MTD 120 carries out C/N ratio measurement in four different ways, according to the carrier type and the band in use: A) Terrestrial band, analogue carrier Carrier level is measured using a quasi-peak detector (230 kHz BW).

  • Page 21: Measuring The Power Of Digital Channels (Channel Power)

    4.9.1.4.- Measuring the Power of Digital Channels (Channel power) The MTD 120 offers two different methods to measure digital channels power, according to the active operation mode: Automatic method in TV mode and Integration method in Spectrum mode. The Automatic method measures digital channel power in the measurement filter bandwidth and estimates total channel power assuming that spectral density is uniform throughout channel bandwidth.

  • Page 22: Tv Mode Functions Menu

    TV & SAT Level Meter MTD 120 User Manual 4.9.2.- TV Mode Functions Menu In TV operation mode, press key ENTER [5] to access the functions menu of the TV mode: FUNCTIONS FUNCTIONS Band switching Band switching System & Standard System &...

  • Page 23: Batteries And External Units Power Supply (Battery & Lnb)

    TV & SAT Level Meter MTD 120 User Manual System Lines/frame Channel Bandwidth Video/sound separation Video mode Audio mode 625/50 7 MHz 5,5 MHz 625/50 625/50 625/50 625/50 625/50 625/50 525/60 625/50 Table 2.- Selectable terrestrial analogue standards and their characteristics.

  • Page 24: Configuring The Data Logger Function

    Unselect Figure 14.- Configuration of the DATA LOGGER function After an interval of half a minute without the MTD 120 controls being touched, it will automatically return to the Data logger function main screen. 1.- TO MEASURE, PRINT OR MEASURE AND PRINT? First of all, the user must indicate whether he wants to take measurements or to print them, or to do both at the same time.
  • Page 25 TV & SAT Level Meter MTD 120 User Manual press key ENTER [5]. This will lead to a screen like the one shown below: ALARM Hour : 07 : 01 Minute : 00 Month : 05 Second : 00 Time...

  • Page 26: Selecting The Measurements To Be Taken

    TV & SAT Level Meter MTD 120 User Manual 4.9.2.4.2.- Selecting the Measurements to be Taken Once the Data logger function has been configured, activate the measurement configuration(s) (columns) which you would like to use. The headings of the measurement matrix columns of the Data logger function coincide with the number of memorised measurement configurations, simply place the cursor over each column and you will see the more important parameters displayed at the bottom of the...

  • Page 27: Clock

    4.9.2.7.- Selecting the Channels Table (Channel set) The MTD 120 comes with twelve stored channel tables as standard (four for terrestrial television and eight for satellite), for greater adaptability to the selection requirements of different countries or zones. See the channel-frequency table in appendix A of the manual.

  • Page 28: C/N Setup

    MTD 120 has been connected. Given that the MTD 120 satellite channel tables have been defined in the Ku band and the MTD 120 tunes in IF (like all satellite receivers) the LNB local oscillator frequency has to be defined to correctly tune the channel mode.

  • Page 29: Diseqc Command Generator

    TV & SAT Level Meter MTD 120 User Manual The Teletext function is especially valuable for the final optimization process in TV installations. Any interference or reception through indirect beams generates digital in the digital information of the Teletext, which are highly visible as erroneous characters on the screen.

  • Page 30: Beep

    TV & SAT Level Meter MTD 120 User Manual Character Command Associated parameter General Sat A/B Reset Power ON Standby Destined L.O. frequency High/Low Switch H/V polarisation Position A/B Sw. option A/B Non-destined Switch 1 Switch Switch 2 Switch 3...

  • Page 31: Spectrum Analyser Operating Mode

    A vertical broken line, called marker, appears on the spectrum display to identify the tuned frequency. One of the applications of the MTD 120 operating as Spectrum Analyser is in the search for the best orientation and position of the receiving antenna.

  • Page 32: Band Switching

    TV & SAT Level Meter MTD 120 User Manual 4.10.1.1.- Band Switching Permits to swicth from terrestrial (5-862 MHz) to satellite band (920-2150 MHz) and vice versa. 4.10.1.2.- Span This function enables selecting the displayed frequency range in Spectrum Analyser mode between Full (the entire band), 500 MHz, 200 MHz, 100 MHz, 50 MHz, 32 MHz, 16 MHz and 8 MHz (the latter two only in terrestrial bands).

  • Page 33: Reference Noise

    TV & SAT Level Meter MTD 120 User Manual 4.10.1.6.- Reference Noise (Only in C/N measurements). Permits to define the frequency where noise level will be measured. To modify the frequency where you want to measure noise level, accede to the menu functions and select the Reference noise function...

  • Page 34: Selecting The Measurement Mode

    TV & SAT Level Meter MTD 120 User Manual 4.10.2.- Selecting the Measurement Mode The Spectrum Analyser mode permits to make different measurements at the same time you see the signals present in the band. The types of measurements available are:...

  • Page 35: Measuring The Power Of Digital Channels (Channel Power)

    4.10.2.3.- Measuring the Power of Digital Channels (Channel Power) In the Spectrum Analyser mode the MTD 120 measures digital channel power using an Integration method between channel limits which are defined by the user. To show the interest of this method, imagine a spectral distribution like the one shown in the following figure (channel bandwidth is 8 MHz defined by the markers).

  • Page 36: Selecting The Sound Mode (Sound)

    [6] to select the desired frequency deviation and press key ENTER [5] to validate. When the LV function is selected, the speaker of the MTD 120 permits a tone whose frequency depends on the level of the signal received. This is very useful when installing antennas, since the user can locate the peak signal without having to look continually at the monitor of the level meter.

  • Page 37: Measurement Configuration Memories

    4.12.- Measurement Configuration Memories To facilitate measurement, the MTD 120 is able to store up to 99 configurations in an internal memory. In this way, it is possible to select the most common transmissions in a work area with their corresponding configurations quickly and easily.

  • Page 38: Direct Access To Functions

    TV & SAT Level Meter MTD 120 User Manual 4.13.- Direct Access to Functions Keys FA [28] and FB [29] give direct access to any of the functions on the TV and Spectrum Analyser mode functions menus. To establish a relationship between the direct access key and a function, access the functions menu, select the function you wish to access directly and press key FA [28] or FB [29].

  • Page 39: Handshake And Control Lines

    - DATA TERMINAL READY (pin 4 MTD 120): This line is permanently active in order to indicate the establishment of the communication. Connections The cable between the MTD 120 and the printer must have the following connections: PC CONNECTOR LEVEL METER CONNECTOR Type D-25, female...

  • Page 40: Ber Measures

    TV & SAT Level Meter MTD 120 User Manual 5.- BER MEASUREMENT OF QPSK & QAM MODULATED SIGNALS 5.1.- Description By means of the options BER measurement for DVB-Satellite (QPSK modulation), DVB-Cable signals (QAM modulation) and DVB- Terrestrial (COFDM modulation), it is possible to make Bit Error Rate measurements on digital signals. Besides, these options incorporate the DCI function (DVB Channels Identifier) which provides information on the tuned channel, in this way it is possible to identify it with total...
  • Page 41 TV & SAT Level Meter MTD 120 User Manual First of all it is shown the BER before FEC (Forward Error Correction). In a digital reception system for cable signals, after the QAM decoder an error correction method called Reed-Solomon is applied (see figure 27).

  • Page 42: Qpsk Modulation

    TV & SAT Level Meter MTD 120 User Manual 5.4.- QPSK modulation Before to measure the BER it is necessary to define some parameters concerning the digital signal, which are described next. To see its present value or to modify it, being in the BER measuring screen, press key ENTER [5], a multiple-choice menu showing the functions relative...
  • Page 43 TV & SAT Level Meter MTD 120 User Manual The BER measurement is provided in scientific notation (i.e. 2.0 E-3 means 2.0x10 , that is to say two incorrect bits of every 1,000) and through an analogue bar (as its length is smaller the signal quality will be better). The analogue representation is done on a logarithmic scale (not linear).

  • Page 44: Cofdm Modulation

    TV & SAT Level Meter MTD 120 User Manual 5.5.- COFDM modulation Before to measure the BER it is necessary to define some parameters concerning the digital signal, which are described next. To see its present value or to modify it, being in the BER measuring screen, press the ENTER [5] key, a multiple-choice menu showing the functions relative to the BER measurement will appear.
  • Page 45 TV & SAT Level Meter MTD 120 User Manual BER after Viterbi Wrong packets COFDM REED- TUNER VITERBI DEMOD. SOLOMON Figure 31.- COFDM reception system. The BER measurement is provided in scientific notation (i.e. 3.1 E-7 means 3.1x10 , that is to say 3.1 wrong bits of each 10000000) and through a graphic bar (as its length is smaller the signal quality will be better).
  • Page 46 TV & SAT Level Meter MTD 120 User Manual TPS in lock The TPS (Transmission Parameter Signalling) are decoded. The TPS are carriers (17 in the 2k system and 68 in the 8k system) modula- ted in DBPSK, containing information related to the transmission, modulation and codification: Modulation type (QPSK, 16-QAM, 64- QAM), Hierarchy, Guard Interval, Viterbi Code Rate, Transmission mode (2k or 8k) and Number of the received frame.

  • Page 47: Dvb Channels Identifier

    Service and Network fields is the same. The information that appears in the Network, Bouquet and Service fields is responsibility of the Operator in charge of the tuned transponder. The MTD 120 only decodes this information, if it is present, and shows it on the screen.

  • Page 48: Description Of The Inputs And Outputs

    [35] connector on the side panel. The peak signal level should never exceed 130 dBµV. 6.2.- RS-232C serial port The MTD 120 incorporates an RS-232C serial port for data exchange with a PC, a serial printer or to other devices. The signals in this connector are described in Table 5.

  • Page 49: Scart (Din En 50049)

    TV & SAT Level Meter MTD 120 User Manual 6.3.- Scart (DIN EN 50049) Figure 35.- Scart socket (external view). Also known as PERITEL connector (in conformity with standard NF-C92250). The signals in this connector are the following: PIN number SIGNAL CHARACT.

  • Page 50: Maintenance

    - The battery compartment is located in the rear panel of the instrument. Remove the 5 securing screws (A) (2 on each side and 1 at the bottom) shown in the previous figure (here the battery compartment is shown taken out and facing down). Rest the MTD 120 on its rear panel and lift it to free the battery compartment.

  • Page 51: Cleaning Recommendations

    - Place and secure the battery holder (B) with the two screws (C). - Insert the battery compartment into the back of the MTD 120 and secure with the five screws (A). - If you wish, replace the holster.

  • Page 52: Appendix A: Channel-Frequency Tables

    MTD 120 APENDICE A .- Tablas Canal - Frecuencia APPENDICE A: Tables Canal-Fréquence APPENDIX A: Channel - Frequency tables C C I R Freq. Freq. Freq. Freq. Freq. Freq. Freq. 48,25 189,25 294,25 415,25 535,25 655,25 775,25 55,25 196,25 303,25...
  • Page 53 MTD 120 ASTRA-HL Freq. Freq. Freq. Freq. Freq. Freq. Freq. 10714,25 10861,75 11023,25 11170,75 11332,25 11493.75 11641,25 10743,75 10891,25 11052,75 11214,25 11361,75 11523,25 11670,75 10773,25 10920,75 11082,25 11243,75 11391,25 11552,75 10802,75 10964,25 11111,75 11273,25 11420,75 11582,25 10832,25 10993,75 11141,25 11302,75...
  • Page 54 La Laguna. E-mail televes.fr@televes.com 948 17 41 49 Tfnos. 922 31 13 14 / 31 13 16 jazpeitia@cin.es 922 31 13 33 TELEVES MIDDLE EAST FZE P.O. Box 17199 tenerife@televes.com OVIEDO C.P.33006 JEBEL ALI FREE ZONE DUBAI Avda. Buenavista 16.

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