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Terra at422 Installation And Operating Instructions

Terra at422 Installation And Operating Instructions

Twin tv channel amplifier

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OPERATING
Settings menu
The amplifier has two modes of operating:
1. Normal mode: sets after switch on;
RF channel can be set in normal mode by pressing buttons ▼ or ▲.
2. Setting mode: to enter the setting mode press and hold ▼ and ▲ buttons simultaneously for 1 second, to exit mode
press and hold ▼ and ▲ buttons simultaneously for 1 second again.
Menu settings of each section should be set individually. Section 1 or 2 can be selected by pressing button "Enter" (for
example: 0.6 - 1 section, output channel 06; 08. - 2 section, output channel 08), see Figure 7:
Position of glowing dot means which section is activated.
Select necessary to change parameter by pressing button ▼.
Enter necessary parameter values by pressing ▲ button:
1. 00 10 - Output attenuator 0 dB to -10 dB by 1 dB step
2. ON/OF - RF output on/off
3. ON/OF - Analog/ Digital (ON for analog channel)
4. -8 8 - Offset of a central frequency in respect to filter (see table 1)
5. 0 /12 - DC on RF input
6. AU/ B - TV standard
If TV standard is changed, default settings are set automatically for selected standard.
NOTE! DC on RF input (0 /12) can be dangerous for some devices.
If no action is taken for 1 minute, sleep mode (- -) is activated. To leave sleep mode press any button.
The last selected parameters will remain in memory if the power is interrupted.
Technical specifications
Table 3.
Sections
Tuning range of channels
RF input
TV standard
pr.
channel bandwidth
level/impedance
frequency range of RF distribution
loop through gain
return loss
RF output
level/impedance, typical
MER of DVB-T signal
frequency range of RF combining
DC pass through, max.
combining through loss Terr/SAT
level adjustment range
pr.
return loss
Noise figure
Selectivity, typical
40 dB, ±1.25 MHz from 7 MHz bandwidth border 40 dB, ± 2 MHz from 7 MHz bandwidth border
pr.
Offset**
Spurious signals level
Mirror channel selectivity
Flatness of channel bandwidth, typical
DC feeding for external
pr.
Supply voltage
Current consumption***
Operating temperature range
Dimensions/Weight (packed)
*
6-12 channels by Au standard, 5-12 channels by B standard (see table 1)
** the offset is used for fine tuning of the channel frequency response
*** without external DC loading
pr. software control
Draugystes str. 22, LT-51256 Kaunas, Lithuania, tel.: +370 37 - 31 34 44, fax: +370 37 - 31 35 55
E-mail: terra@terraelectronics.com, http://www.terraelectronics.com
Offset tunning
Figure 7.
Table 2.
Displayed
1
2
3
4
5
6
7
8
-8
-7
-6
-5
-4
-3
-2
-1
2
174-230 MHz (see table 1)
analog (Au, B)
digital (DVB-T*)
7 MHz
60-85 dBµV/75 Ω
50-80 dBµV/75 Ω
47-862 MHz
0 ± 1.5 dB
>10 dB
90 dBµV/75 Ω
85 dBµV/75 Ω
-
≥ 36 dB (input signal MER 38 dB)
47-2150 MHz
0.3 A 24 V
1.5/2.5 dB
0 ÷ -10 dB by 1 dB step
≥ 10 dB
8 dB
± 1 MHz by 0.125 MHz step
≤ -60 dBc
≥ 60 dB
± 1.5 dB
12 V
0.1 A max.
12 ± 1 V
0.45 A
0
÷ +50
C
o
o
198x107.5x36 mm/0.9 kg
Multichannel headend
Product description
The at422 twin TV channel amplifier is intended to filter and equalize TV signals of VHFIII channels before distributing
in the network.
There are incorporated two fully independent TV amplifiers in one unit and consist of: AGC (Automatic Gain Control) circuit,
SAW (Surface Acoustic Wave) based ultra high selective filter, IF (Intermediate Frequency) offset control circuit, adjustable
output attenuator and controllable +12 V DC feeding circuit for preamplifier (Figure 1).
The amplifier can be used as stand-alone unit as well as modular system powered from single power supply (Figure 3).
The amplifier has been designed in accordance with standard EN 50083-5 class 2.
Shift,
The amplifier is intended for indoor use only.
MHz
RoHS compliant.
0
0
+0.125
Safety instructions
+0.25
+0.375
Installation of the amplifier must be done according EN 60728-11 and local safety standards.
+0.5
The amplifier is powered from power supply unit (PSU) +12 V. This voltage is not dangerous to life.
+0.625
PSU +12 V must have a short circuit protection.
+0.75
Any repairs must be done by qualified personnel.
+0.875
+1.0
Do not plug the PSU +12 V into the mains socket until all amplifier's cables have been connected correctly. The mains
-1.0
socket of PSU +12 V must be easily accessible.
-0.875
To disconnect the amplifier, disconnect the PSU +12 V from mains.
-0.75
-0.625
When amplifier is disconnected, LED display does not glow.
-0.5
Amplifier shall not be exposed to dripping or splashing water and no objects filled with liquids, such as vases, shall be
-0.375
placed on it.
-0.25
Avoid placing amplifier next to central heating components and in areas of high humidity.
-0.125
No naked flame sources, such as lighted candles, should be placed on amplifier.
If the amplifier has been kept in cold conditions for a long time, keep it in a warm room no less than 2 hours before
plugging into the mains.
The ventilation should not be impeded by covering the ventilation openings with items, such as newspapers, table-cloths,
curtains.
Mount the amplifier in vertical position.
From top, front and bottom of installed amplifier must be as least 10 cm free space.
This product complies with the relevant clauses of the European Directive 2002/96/EC. The unit must be recycled or
discarded according to applicable local and national regulations.
External view
Figure 1. External view and structure diagram
Twin TV channel amplifier at422
1 - ◄ - RF input, DC output +12 V switchable (F socket)
2 - ►- RF output (input signal loop-through) (F socket)
3 - two digit LED display
4 - +12 V powering input (screw terminal)
5 - ◄ - RF input (output signal loop-through) (F socket)
6 - ► - RF output (F socket)
7 - power distribution bus connector (under the cover)

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Summary of Contents for Terra at422

  • Page 1 ▼ and ▲ buttons simultaneously for 1 second again. The at422 twin TV channel amplifier is intended to filter and equalize TV signals of VHFIII channels before distributing Menu settings of each section should be set individually. Section 1 or 2 can be selected by pressing button “Enter” (for in the network.
  • Page 2 Mounting on DIN rail Read the safety instruction first. DC power should be connected, after at422 mechanically placed into position (Figure 2, 4) and connected (Figure 3). Menu settings are ready for user updates. If RF IN connector (5) is not used, connect the 75Ω isolated load supplied (Figure 1).