Terra MT47 - External View and Controls

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INSTALLATION INSTRUCTIONS
Read the safety instruction rst.
To change the modulator settings, open the plastic cover.
If RF IN connector on the modulator is not used, connect the 75 Ω load supplied.
When modulators are cascading, space between channels must be no less than two (for example 21, 24, 27 and etc.).
To wall mount the modulator - screw the modulator to the wall (see gure 1).
Do not connect TV antennas to modulator RF IN connector directly. If you intend to combine TV signals of antennas and
the modulator, plug in booster with output-to-input isolation ≥20 dB between antenna output and RF IN connector.
DEFAULT SETTINGS
1. Output channel E02;
2. Audio subcarrier deviation ±50 kHz (when audio signal level 1 kHz is 775 mV);
3. B/G standard; audio subcarrier 5.5 MHz (Preset b5);
4. Test pattern generator OFF (Preset no);
5. Frequency shift none (Preset 0);
6. P/S ratio -16 dB (Preset I6);
7. Output signal on (Preset on);
8. Sound subcarriers deviation regulator (Preset 0, for MT57);
9. Sound mode STEREO (Preset A5, for MT57).
OPERATING
CHANGING OF SETTINGS
The modulator has two modes of operating:
1. normal: sets after plug in;
Output channel can be selected in normal mode by pressing buttons “-“ or “+” (see tables 2-11).
2. setting: to enter the setting mode press and hold “-“ and “+” buttons simultaneously for 1 second, to exit setting mode
press and hold “-“ and “+” buttons simultaneously for 1 second.
Select of necessary to change parameter by pressing button “-“ and set necessary mode by pressing “+” button.
1. TV system setting:
a) after switching settings mode, indicator displays current TV system (see table 1);
b) set necessary TV system by pressing “-“ button (see tables 2-11);
c) after TV system changing, modulator sets to rst channel of selected TV system (see tables 2-11), other settings
remains unchanged.
2. test pattern generator:
a) press “-“ button;
b) switching between OFF and ON by pressing button “+”, “no” - test pattern generator OFF, “t5” - test pattern generator ON.
3. ne tuning of video carrier frequency:
a) press button “-“;
b) shift video carrier frequency by pressing button “+” (see table 12).
4. picture/sound ratio switching:
a) press button “-“;
b) switching between 12 dB and 16 dB by pressing button “+”.
5. output signal switching:
a) press button “-“;
b) switching between RF ON and RF OFF by pressing button “+”, “on” - RF ON, “oF” - RF OFF.
6. sound subcarriers deviation regulation (for MT57):
a) press button “-“;
b) set necessary deviation by pressing button “+“ (see table 13).
7. STEREO/MONO mode switching (for MT57):
a) press button “-“;
b) switch between MONO/STEREO mode by pressing button “+“ ("A-" - mono, "A5"- stereo).
PROTECTION FROM UNAUTHORIZED ACCESS
To prevent unauthorized access press buttons "-" and "+" simultaneously twice in 0.5 sec. "LO" will briey be displayed.
To revert to normal operation, repeat above procedure. "UL" will briey be displayed. The symbol "LO" appears, if you try to
change settings in locked mode.
SOUND SUBCARRIER DEVIATION SETTING
MT47: When input signal level is from 340 mV to 775 mV in both audio inputs, use a regulator (gure 1, position 11) to set
the sound subcarrier deviation ±50 kHz. The factory set sound subcarrier deviation is ±50 kHz for an input signal level of
775 mV in both audio inputs.
MT57: The factory set sound subcarier deviation is ±50 kHz for an input signal 1 kHz/775 mV in both audio inputs
(Preset 0). Use software control for audio deviation regulation ±6 dB (see table 13).
OUTPUT SIGNAL LEVEL ADJUSTMENT
Use a regulator (gure 1, position 6) to adjust an output level. Output level adjustment range is 0 ÷ -20 dB.