Quattro TV channel amplifier at440
Product description
The at440 is intended to filter 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 filters/amplifiers in one unit. Each filter consists of an AGC (Automatic
Gain Control) circuit, SAW (Surface Acoustic Wave) ultra high selective filter, IF (Intermediate Frequency) offset control circuit,
adjustable output attenuator and contro12 V DC feeding circuit for preamplifier (Figure 1).
This at440 can be used as stand-alone unit or as a modular system powered from single power supply (Figure 3).
The amplifier has been designed in accordance with standard EN60728-5 grade 2.
The amplifier 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 amplifier must be done according IEC60728-11 and national safety standards.
The amplifier 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 qualified personnel.
Do not connect the 12 V power supply unit into the mains socket until all amplifier cables have been connected correctly.
The mains socket of PSU +12 V must be easily accessible.
To disconnect the amplifier power completely, disconnect the power supply from the mains.
Do not expose this amplifier to moisture or splashing water and make sure no objects filled with liquids, such as vases,
are placed near or on the unit.
Avoid placing the amplifier next to heat sources such as central heating components or in areas of high humidity.
Keep the amplifier away from naked flames.
If the amplifier 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 amplifier in a vertical position only to allow the free flow 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 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
pr.
pr.
pr.
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
0
o
÷
+50
o
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
(filter1),
F2
(filter2),
F3
(filter3),
F4
(filter4) 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 confirm 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 confirm the channel value the “
ENTER
”
must be pressed. Set the output attenuator value (00-10) by
pressing (▼-minus or ▲- plus) keys. To confirm “
ENTER
” must
be pressed. Set RF (on/ oF) by pressing (▼-minus or ▲- plus)
keys. To confirm “
ENTER
” must be pressed. Set offset value
(see table 1) by pressing (▼-minus or ▲- plus) keys. To confirm
“
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 specifications
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
