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ENGLISH
TV & SAT Level Meter MTD 120
User Manual
IMPORTANT REMARK
To measure digital channels power correctly it is indispensable to tune channel at its central frequency and to define channel
bandwidth.
4.11.- Selecting the Sound Mode (Sound)
From the TV operating mode, analogue mode, press key SOUND [26]. The screen will show the SOUND menu with the types of sound
available. Pressing keys
[6] choose the type of sound you wish and then press key SOUND [26] or the key ENTER [5] to activate it.
Table 4 shows the different options for the sound mode.
Table 4.- Sound modes.
When you select the NTUN (continuous tuning using a narrow detection filter) and BTUN (continuous tuning using a broad detection filter)
options the screen displays a window showing the frequency deviation of the sound carrier, this is variable between 4.00 MHz and 9.00
MHz. To define it press keys
[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.
When the NICAM option is selected, it is possible to measure the Bit Error Rate of the modulation. To obtain this measurement, from the
TV operating mode, level measurement, press key MONITOR [1] in order to activate the mode of maximum measurement information
displayed on the screen (name assigned to memory, power supply to external units, sound, colour system, TV standard, level and
frequency/channel). In the position relative to the type of Sound will appear the information about the type of NICAM according to:
Sound: Type + Error
Type = NICAM type:
"- -":
no NICAM is detected
"du":
dual NICAM
"st":
stereo NICAM
"mo": mono NICAM
Error = indication of the bit error rate:
"E
v
I":
error rate < 1e-5
"E5":
1e-5 < error rate < 1e-4
"E4":
1e-4 < error rate < 1e-3
"E3":
1e-3 < error rate < 2.7 e-3
"E ^I":
error rate > 2.7 e-3
Therefore, for example, the indication Sound: duE
v
I has to be interpreted as NICAM sound is selected, the detected NICAM is dual and
Type
Function
Band
4.50
Sound carrier 4.5 MHz above the picture carrier
Terrestrial
5.50
Sound carrier 5.5 MHz above the picture carrier
Terrestrial
5.74
Selects the second carrier in DUAL or STEREO transmissions,
Terrestrial
at 5.74 MHz of the picture carrier
5.80
Sound carrier 5.8 MHz above the picture carrier
Satellite
6.00
Sound carrier 6.0 MHz above the picture carrier
Terrestrial
6.50
Sound carrier 6.5 MHz above the picture carrier
Terrestrial
Satellite
6.65
Sound carrier 6.65 MHz above the picture carrier
Satellite
7.02
Sound carrier 7.02 MHz above the picture carrier
Satellite
NTUN
Continuous tuning (4.00 - 9.00 MHz) with narrow sound detection filter
Terrestrial
(110 kHz)
Satellite
BTUN
Continuous tuning (4.00 - 9.00 MHz) with broad sound detection filter
Terrestrial
(240 kHz)
Satellite
NICA
NICAM decoding
Terrestrial
AM
AM demodulation
Terrestrial
FM
FM demodulation
Terrestrial
LV
Tone whose frequency varies with the signal level
Terrestrial
Satellite
OFF
Suppresses the sound
Terrestrial
Satellite
