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Details
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Views of the modulator
View of the included accessories: connecting bridge, terminating resistors, wall mount (wall installation option) and spacer (to insert between the unit and an adjacent module)
Distinguishing features
- Two independent signal paths,
- Output RF channels selectable within 110-862 MHz band (1-12, 21-69, S1-S40) and from B/G/D/K/I/L/Au standards,
- Maximum output level: 90 dBuV,
- Output level adjustment range: 0...-10 dB,
- Intermodulation distortion (IMD2/IMD3): below -60 dB
- C/N >55 dB
- Audio input level adjustment range: -6...+6 dB (step 2 dB)
- Digital interface, control via buttons located on the front panel,
- Two-position display,
- DIN rail mountable (usually in a 19" RACK cabinet).
Mt420 R82515 modulator is a top class device designed for insertion of additional RF channels in MATV /shared antenna systems. The channels can carry signals from CCTV cameras, DVD/media players, satellite/DVB-T receivers, etc. The device has two independent signal paths, so it is possible to introduce signals from two video/audio sources on RF channels within the same or in different TV bands. The output signals can then be distributed in large MATV systems - in multifamily buildings, hotels, public buildings, etc.
The standard of the RF signals can be selected from multiple options - B/G/D/K/I/L/Au. The maximum output level can be set to 90 dBuV, within the frequency range 110-862 MHz. The device has been designed and manufactured according to EN 50083-5.
The unit can be installed on a wall (with the wall mount), or placed on universal DIN rail R82538 in a 19" RACK cabinet. The latter solution is usually used in the case of MATV/SMATV headends with a number of modules.
The twin modulator can be powered with a 12 VDC power supply with minimum current capacity of 0.45 A. In the case of a greater number of these and other units, the best choice is the dedicated power supply DR-60-12 R82532.
The complete Terra solution for MATV (shared antenna) systems includes a range of components that can be selected according to the current needs and requirements of customers:
- R82510 - at420 - twin channel amplifier
- R82515 - mt420 - twin VSB TV modulator
- R82520 - ma400 - high-level multiband amplifier (FM/VHFIII/UHF)
- R82532 - DR-60-12 - DIN rail power supply capable of powering up to 8 system devices
- R82536 - 699.20 - DC distribution cable for 4 modules
- R82538 - universal DIN rail mounting bracket matching 19-inch RACK cabinets for up to 8 system devices and power supply
- R82540 - 699.026 - F-F coaxial bridge for signal links between adjacent modules
An example set of the amplifiers and modulators for a MATV system. For maximum system stability,
the number of modules on each side of the power supply should not exceed 4 units.
the number of modules on each side of the power supply should not exceed 4 units.
Specifications
| Name | mt420 |
| Code | R82515 |
| Frequency rangei [MHz] | 110-862 |
| Channels (#) | 1-12, 21-69, S1-S40 |
| TV standard (#) | B/G/D/K/I/L/Au |
| RF output | |
| Maximum output level [dBμV] | 90 |
| Impedance [Ω] | 75 |
| Output level stability [dB] | ±2 |
| Level adjustment [dB] | 0...-10 (step 1) |
| Carrier stability [kHz] | ±20 |
| Fine tuning range of video carrier [MHz] (#) | ±2.25 (step 0.25) |
| Channel width [MHz] (#) | 7/8 |
| V/A carriers ratio [dB] (#) | 12/16 |
| V/A carriers ratio stability [dB] | ±3 |
| Intermodulation distortion (IMD2/IMD3) [dB] | < -60 |
| C/N ratio [dB] | > 55 |
| Return loss [dB] | > 10 |
| Video | |
| Input level [Vp-p] | 1 ±0.1 |
| Impedance [Ω] | 75 |
| Video baseband [MHz] | 0.02...6 |
| S/N ratio (weighted) [dB] | > 55 |
| Audio | |
| Frequency range [Hz] | 40...15000 |
| Input impedance [kΩ] | > 10 |
| Preemphasis [μs] | 50 |
| Input level adjustment range [dB] (#) | -6...+6 (step 2) |
| FM S/N (weighted) [dB] | > 50 |
| AM S/N (weighted) [dB] | > 47 |
| General | |
| Power [V] | 12 |
| Current consumption [A] | 0.45 |
| Operating temperature [ºC] | 0...50 |
| RF connector | F |
| A/V connectors | RCA (female) |
| Dimensions [mm] | 198x107.5x36 |
| Weight [kg] | 0.9 |
(#) menu controlled
