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View of the modulator
View with the cover open
Front view
View of the packaging
High-class double side band stereo A2 audio/video RF modulator MT57 R871757 is controlled by a microprocessor - the choice of output TV channel is performed with two buttons (after opening the top cover). The channel number or any changeable parameter is displayed on the LED display and stored in non-volatile memory. Use of quartz-stabilized PLL practically eliminates frequency error. There is a possibility to protect the modulator against unauthorized change of the preset parameters.
The modulators can be connected in cascade. Their RF signals can be combined with terrestrial TV channels (it requires to match the levels of terrestrial TV signals with the RF output levels of the modulators, as well as to ensure adequate frequency spacing).
The modulators can be connected in cascade. Their RF signals can be combined with terrestrial TV channels (it requires to match the levels of terrestrial TV signals with the RF output levels of the modulators, as well as to ensure adequate frequency spacing).
Adjustment options:
- video carrier frequency,
- PAL version,
- audio input level,
- A/V ratio.
The modulators can be successfully used both in home antenna installations as well as in small-sized MATV systems. Meticulous quality control in Terra company makes these devices virtually failure-free.
Specifications
| Name | MT47 | MT57 | |
| Code | R871747 | R871757 | |
| Video input | frequency range | 20 Hz ... 6 MHz | |
| level / impedance | 1 V / 75 Ω | ||
| Audio input | frequency range | 20 Hz ... 15 kHz | |
| level adjustment | 0 ... 7 dB | -6 ... 6 dB (#) | |
| level / impedance /deviation | 775 mV RMS 10 kΩ / 50 kHz | 2 x 775 mV RMS 10 kΩ / 50 kHz | |
| RF output | typical level / impedance | 85 dBμV / 75 Ω | |
| level adjustment | 0 ... -20 dB | ||
| PAL version (#) | B/G/D/K/H/I/L/M/N/Australia | ||
| frequency range (#) | 45 ... 84, 170 ... 300, 470 ... 862 MHz | ||
| Carrier frequency error | +/- 50 kHz | ||
| Audio subcarrier frequency (#) | 4.5 / 5.5 / 6.0 / 6.5 MHz | B/G/Australia stereo A2 (sec. sound sub. 5.742 MHz) | |
| Fine tuning range of video carrier frequency (#) | max. +/- 2.25 MHz, 0.25 MHz step | ||
| RF loop-through loss | 2.5 dB | ||
| RF loop-through frequency range | 5 ... 862 MHz | ||
| A/V ratio (#) | -12/16 dB | ||
| Amplitude modulation depth (typical) | 81% | ||
| SNR (weighted) | >/= 55 dB | ||
| Power / Power consumption | 230 VAC 50 Hz / 3 W | 230 VAC 50 Hz / 4 W | |
| Operating temperature range | -10oC ... 50oC | 0oC ... 50oC | |
| Dimensions / Weight | 133x73x39 mm / 0.36 kg | ||
(#) menu controlled
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