Twin VSB Multi-standard Modulator Terra mt420 (ch. 6-12, 21-69, S1-S40)

Code: R82515
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Twin Channel Amplifier: Terra at420 (UHF, analog TV & DVB-T, AGC)
Twin Channel Amplifier: Terra at420 (UHF, analog TV & DVB-T, AGC)
Twin Channel Amplifier: Terra at420 (UHF, analog TV & DVB-T, AGC)
Views of the modulator
Twin Channel Amplifier: Terra at420 (UHF, analog TV & DVB-T, AGC)
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.
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]
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
Input level [Vp-p] 1 ±0.1
Impedance [Ω] 75
Video baseband [MHz] 0.02...6
S/N ratio (weighted) [dB] > 55
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
Power [V] 12
Current consumption [A] 0.45
Operating temperature [ºC] 0...50
RF connector
A/V connectors
RCA (female)
Dimensions [mm] 198x107.5x36
Weight [kg] 0.9
(#) menu controlled