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Views of the amplifier
View of the included accessories: connecting bridge, wall mount (wall installation option) and spacer (to insert between the amplifier and an adjacent module)
Distinguishing features
- Two independent paths (sections),
- Amplification of two analog TV channels or two DVB-T multiplexes from the whole UHF band (470...862 MHz, ch. 21-69),
- AGC - automatic equalization of all channel levels to 90 dBuV (analog mode) or 85 dBuV (DVB-T mode),
- Channel offset: -1...+1 MHz (0.25 MHz step),
- High modulation error rate (MER): >36 dB,
- Selectivity 40 dB at +/-1.25 MHz (analog) or at +/-2 MHz (DVB-T) from channel borders due to ultra selective SAW (Surface Acoustic Wave) filters,
- Output level adjustment: 0...-10 dB,
- Digital interface with buttons located on the front panel,
- Two-position display,
- 12 VDC / 0.1 A power for a preamplifier,
- DIN rail mounting (usually in a 19" RACK cabinet),
- Perfect for the transitional period when broadcasters often change the frequency and power of DVB-T multiplexes.
At420 R82510 is a double highly selective tunable amplifier capable of filtering, amplifying and equalizing antenna signals in the whole UHF band, in analog or digital (DVB-T) mode. The output channels/multiplexes can then be distributed in large MATV systems - in multifamily buildings, hotels, public buildings, etc. Its high modulation error rate (MER), not lower than 36 dB, provides an excellent reception of digital terrestrial TV broadcasts even in very extensive systems.
Each of the two independent paths can amplify one DVB-T multiplex or analog TV channel. It means that one module can amplify two digital multiplexes. The paths are equipped with automatic gain control (AGC) and ultra selective SAW (Surface Acoustic Wave) filters.
The device is digitally adjustable with three buttons located on the front panel. Thanks to exceptional flexibility and AGC, the device is perfect for the transitional period when broadcasters often change the frequency and power of DVB-T multiplexes.
The automatic gain control ensures:
- automatic equalization of signal levels - for input levels within 50-80 dBuV range for digital multiplexes and 60-85 dBuV range for analog channels - to 80 dBuV (DVB-T) and 85 dBuV (analog TV). This function eliminates the need of manual adjustments of signal levels at the installation and maintenance stages;
- automatic gain adjustment in the case of changes of transmitter parameters.
The amplifier can be powered with a 12 VDC power supply with minimum current capacity of 0.45 A (for one unit). In the case of a greater number of the units, the best choice is the dedicated power supply DR-60-12 R82532. The at420 amplifier has the ability to power terrestrial TV masthead preamplifier (12 VDC, max 100 mA).
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 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
- R82511 - at440 - four-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 | at420 | ||
| Code | R82510 | ||
| Number of channels (sections) | 2 | ||
| Tuning range of channels | 470...862 MHz (ch. 21...69. ch. width 8 MHz) | ||
| RF input | operation mode (#) | analog | digital |
| level/impedance [dBμV/ Ω] (#) | 60-85/75 | 50-80/75 | |
| frequency range [MHz] | 47-862 | ||
| loop-through gain [dB] | 0 +/-1.5 | ||
| return loss [dB] | > 12 | ||
| RF output | level [dBμV] | 90 | 85 |
| MER (digital signals) [dB] | - | > 36 | |
| level adjustment [dB] (#) | 0...-10 (step 1) | ||
| return loss [dB] | > 10 | ||
| Noise figure [dB] | 8 | ||
| Selectivity (PAL B/G) | 40 dB at +/-1.25 MHz from channel borders | - | |
| Selectivity (DVB-T) | - | 40 dB. +/-2 MHz from channel borders | |
| Offset [MHz] (#) | +/-1 (step 0.25) | ||
| Spurious signals level [dBc] | < -55 | ||
| Gain ripple [dB] | +/-1.5 | ||
| Power for masthead amplifier (#) | 12 VDC / 0.1 A max | ||
| Supplying voltage [VDC] | 12 | ||
| Current consumption [A] | 0.45 | ||
| Operating temperature [ºC] | 0...50 | ||
| Dimensions [mm] | 198x107.5x36 | ||
| Weight [kg] | 0.9 | ||
(#) menu controlled
Specifications
| Product type | Channel amplifier | ||
| Name | at420 | ||
| Brand | TERRA | ||
| RF input | number | 1 | |
| No. of MUXes supported | 2 | ||
| Operating band | UHF | ||
| Applications | Indoor | ||
| standard | DVB-T/T2 | ||
| AGC function | Yes | ||
| Selectivity | dB | 40 ± 2 MHz from the channel boundary | |
| Specyfikacja techniczna | |||
| UHF 1 input | Frequency range | MHz | 470...862 |
| Gain | dB | AGC | |
| Preamplifier power supply | V/A | DC 12/0.1 | |
| Max. Input level | dBµV | 50...80 | |
| Impedance | Ohm | 75 | |
| Return loss | dB | >10 | |
| RF output | Signal strength | dBµV | 85 |
| Impedance | Ohm | 75 | |
| MER | dB | ≥ 36 | |
| level control | dB | -10...0 with step 1 | |
| Offset | MHz | ± 1 with a step of 0.25 | |
| Return loss | dB | >10 | |
| Noise ratio | dB | 8 | |
| RF combiner | Frequency range | MHz | 47...862 |
| Gain | dB | 0 | |
| General | |||
| Configuration | display + buttons | ||
| Ultra selective SAW filter | Yes | ||
| Built-in power supply | No | ||
| Current drawn | V/A | DC 12/0.45 | |
| RACK 19” mounting | Yes | ||
| Operating temperature | °C | 0...+50 | |
| Weight | kg | 0.9 | |
| Dimensions | mm | 36 × 107,5 × 198 | |
