116
TV & SAT Level Meter MTD 120
User Manual
4.2.- Adjustment of Volume and Monitor Parameters
Repeatedly pressing key SCREEN [3] sequentially activates the VOLUME, CONTRAST, BRIGHTNESS, SATURATION and HUE (this
last only for NTSC colour system) control menus. On activation of a menu for a specific parameter the screen displays a horizontal bar whose
length is proportional to the parameter level, to modify this value simply press keys
[6]. To exit the menu and validate the new value
press key 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.
In the Spectrum Analyser operation mode the screen displays the power spectrum of the active band (terrestrial or satellite). The span,
the reference level and the measuring filter bandwidth are variable as will be shown in paragraph '4.10 Spectrum Analyser Operation Mode'.
4.4.- RF Band Selection: 5-862 MHz / 920-2150 MHz
Tuning is continuous between 5 and 862 MHz (terrestrial band) and between 920 and 2150 MHz (satellite band). There are three ways of
changing the active band:
1. Press key ENTER [5] to accede to the functions menu, if necessary press keys
[6] to select the Band switching function and
then press key ENTER [5] again. The RF band will be switched automatically.
2. Press key SHIFT [31] and select a frequency on the new band using the numeric keyboard. The fifth digit and second decimal act as
confirmation. For example, if the active band is the 920 to 2150 MHz band and you wish to tune the 49 MHz frequency (belonging to
the 5/45 to 862 MHz band), press key SHIFT [31] and then enter 49.00 or 0049.0 using the numeric keyboard.
3. Recall a memory with a tuning frequency belonging to the band you wish to access. (See section '4.12 Measurement Configuration
Memories').
4.5.- Channel Tuning / Frequency Tuning
Pressing key CH/F [30] the MTD 120 switches from frequency tuning to channel tuning and back again.
In channel tuning mode pressing keys
[6] sequentially tunes the channels defined in the active channels table (see the Channel
set function in the TV mode functions menu, section '4.9.2.7 Selecting the Channels Table'). Pressing key
frequency increases while
pressing key
frequency decreases.
In frequency tuning mode there are two ways of tuning:
1. Pressing keys
[6].
By means of keys
[6] selects the desired frequency (tuning is continuous from 5 to 862 MHz and from 920 to 2150 MHz). When
pressing key
frequency increases while pressing key
frequency decreases.
2. Using the keyboard.
Press key SHIFT [31](the frequency listing will disappear), next enter the frequency value in MHz using the numeric keyboard, the fifth
digit and the second decimal act as confirmation. The MTD 120 will calculate the tuneable frequency closest to the entered value and
then display it on-screen.
4.6.- Búsqueda Automática de Emisoras
In the TV mode, by pressing the SEARCH [24] key search starts at the present frequency or channel until it finds a transmission with a
level higher than the search level. The threshold level is defined by means of the Search level function of the TV mode functions menu (see
paragraph '4.9.2.15 Search Level'.).
The Search function halts the search process when the end of the present band is reached, if it is in frequency mode, or when a key is
pressed. In channel mode, the search process is halted when the last channel of the group selected is reached (see Appendix A). The sound
is deactivated during the search process.
4.7.- Selecting Analogue / Digital Mode
Measuring the characteristics of a channel depends, in the first place, on the type of modulation: analogue or digital.
Use key A/D [20] to switch between analogue and digital channels. When switching to a new modulation, the MTD 120 activates the last
measurement configuration used for that modulation.
