Terra at440 User manual

Quattro TV channel amplier at440
Product description
The at440 is intended to lter and equalize UHF TV channel 21 – 60 (470 – 790 MHz) signals before distribution in MATV
or IRS network.
The at440 has four fully independent and agile TV lters/ampliers in one unit. Each lter consists of an AGC (Automatic
Gain Control) circuit, SAW (Surface Acoustic Wave) ultra high selective lter, IF (Intermediate Frequency) offset control circuit,
adjustable output attenuator and controllable +12 V DC feeding circuit for preamplier (Figure 1).
This at440 can be used as stand-alone unit or as a modular system powered from single power supply (Figure 3).
The amplier has been designed in accordance with standard EN60728-5 grade 2.
The amplier is intended for indoor use only.
The at440 can be mounted directly on a headend board, mounted on a bracket or mounted on standard DIN rail.
Safety instructions
Installation of the amplier must be done according IEC60728-11 and national safety standards.
The amplier is powered from a 12 V power supply unit. This voltage is not dangerous to life.
The power supply unit must have a short circuit and overload protection.
Any repairs must be made by qualied personnel.
Do not connect the 12 V power supply unit into the mains socket until all amplier cables have been connected correctly.
The mains socket of PSU +12 V must be easily accessible.
To disconnect the amplier power completely, disconnect the power supply from the mains.
Do not expose this amplier to moisture or splashing water and make sure no objects lled with liquids, such as vases,
are placed near or on the unit.
Avoid placing the amplier next to heat sources such as central heating components or in areas of high humidity.
Keep the amplier away from naked ames.
If the amplier has been kept in cold conditions for a long time, bringing it into a warm environment may cause condensation,
so allow it to warm up for no less than 2 hours before plugging into the mains.
Ventilation should not be impeded by covering the ventilation openings with items, such as newspapers, table-cloths,
curtains etc.
Mount the amplier in a vertical position only to allow the free ow of air through the unit. If installing in a 19” rack system
additional forced air cooling fans may be required (see Table 2 - operating temperature range).
Always allow 10 cm of free space from the top, front and bottom of the unit to enable any heat to be dissipated.
External view
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)
Figure 1. External view and structure diagram
Draugystes str. 22, LT-51256 Kaunas, Lithuania, tel.: +370 37 - 31 34 44, fax: +370 37 - 31 35 55
E-mail: [email protected], http://www.terraelectronics.com
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Sections 4
Tuning range of channels 470-790 MHz (21-60 ch.)
RF input TV standard DVB-T
channel bandwidth 8 MHz
level/impedance 50-75 dBµV/75 Ω
frequency range of RF distribution 47-790 MHz
loop through gain 0 ± 1.5 dB
return loss >10 dB
RF output level/impedance, typical 82 dBµV/75 Ω
MER of DVB-T signal ≥ 36 dB (input signal MER 38 dB)
frequency range of RF combining 47-2150 MHz
DC pass through, max. 0.3 A 24 V
combining through loss Terr/SAT 1.5/2.5 dB
level adjustment range 0 ÷ -10 dB by 1 dB step
return loss ≥ 10 dB
Noise figure 8 dB
Selectivity, typical 40 dB, ± 2 MHz from 8 MHz bandwidth border
Offset* ± 1 MHz by 0.125 MHz step
Spurious signals level ≤ -55 dBc
Mirror channel selectivity ≥60 dB
Flatness of channel bandwidth, typical ± 1.5 dB
DC feeding for external 12 V 0.1 A max.
Supply voltage 12 ± 1 V
Current consumption** 0.75 A
Operating temperature range 0o ÷ +50o C
Dimensions/Weight (packed) 198x107.5x48.5 mm/1 kg
* the offset is used for fine tuning of the channel frequency response ** without external DC loading pr. software control
OPERATING
Settings menu
To enter setting mode, press any keyboard button. The dC
(0V/12V on RF input), F1 (lter1), F2 (lter2), F3 (lter3), F4
(lter4) can be accessed by pressing (▼-minus or ▲- plus) keys.
To enter dC mode, “ENTER” key must be pressed. dC value
(0V/12V) can be set by pressing (▼-minus or ▲- plus) keys.
To conrm the voltage setting “ENTER” must be pressed. The
display will jump back to dC mode.
To enter F1 (filter1) setting the “ENTER” key must be
pressed. Set channel value (21-60) by pressing (▼-minus
or ▲- plus) keys. To conrm the channel value the “ENTER”
must be pressed. Set the output attenuator value (00-10) by
pressing (▼-minus or ▲- plus) keys. To conrm “ENTER” must
be pressed. Set RF (on/ oF) by pressing (▼-minus or ▲- plus)
keys. To conrm “ENTER” must be pressed. Set offset value
(see table 1) by pressing (▼-minus or ▲- plus) keys. To conrm
“ENTER” must be pressed. The display will return to the F1
main setting menu. Now dC, F1, F2, F3, F4 can be selected by
pressing (▼-minus or ▲- plus) keys.
NOTE! DC "ON" can damage some devices in the RF input.
ENSURE DC “12” IS ONLY SELECTED WHEN POWERING
A MASTHEAD PRE-AMPLIFIER. If the unit is untouched or
un-attended for 10 minutes, all parameters and settings will be
stored and sleep mode ("- -") activated.
To leave sleep mode, press any keyboard button.
The at440 has automatic overload or short circuit protection
for RF input connector (1) (Figure 1.)
Technical specications
Table 2.
21
21
21
21
0
00
00
00
00
oF
oF
oF
oF
0
0
0
0
F4
F3
F2
F1
dC
- -
Power Up
Multichannel headend

Installation instructions
Read the safety instruction rst.
DC power should be connected, after at440 is mechanically placed into position (Figure 2, 4) and connected (Figure 3).
Menu settings are ready for user updates.
If RF IN loop-through connector (5) is not used, it must be terminated by the 75 Ω isolated/DC blocked terminator supplied
(Figure 1). Performance may be degraded if this connector is not terminated.
Switch off RF for unused ampliers.
ATTENTION!
1. RF output is switched off as a default.
2. RF output level of the amplier should be set after half an hour of warm-up.
3. Set the difference of the RF output level of any channels to within 2 dB of each other. This is very important
where adjacent channels are used.
4. Only use 75 Ωterminator with DC isolation.
5. The signal level difference between channels at the RF input should not exceed 15 dB in 470-790 MHz.
MOUNTING
Mounting on a wall by screws Mounting on a bracket (supplied)
Connection of cables
Perpendicular to the wall Parallel to the wall
Figure 2. Mounting of amplier
Figure 3. Powering of amplier
Mounting on DIN rail
Default settings
The amplier is supplied with the following default settings:
F1, F2, F3, F4 Displayed Display meaning
UHF channel (21-60) 21 Channel 21
Output attenuator (00-10) dB 00 0 dB attenuation
RF output (on/oF) oF (RF off) RF is turned off
Offset (-2 2) 0 (see table 1) No RF offset is pre-set
DC on RF input (0 /12) 0 DC on input set to 0V
Figure 4. Mounting to DIN rail
Figure 5. Mounting from DIN rail Figure 6. Mounting or removing to/from
DIN rail of plastic spacers (supplied).
Table 1
Displayed Shift,
MHz
0 0
1 +0.125
2 +0.25
-2 -0.25
-1 -0.125
Offset tunning
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.
Equipment intended for indoor usage only.
TERRA conrms, that this product is in accordance to following norms of EU: EMC norm EN50083-2, safety norm EN60065, RoHS norm EN50581.
TERRA conrms, that this product is in accordance with Custom Union Technical Regulations: “Electromagnetic compatibility of technical
equipment“ CU TR 020/2011, “On safety of low-voltage equipment“ CU TR 004/2011.