ELPRO DA204 User manual

DA204 DUAL1X3 VIDEO DISTRIBUTION AMPLIFIER
•Dual 1X3 video distr. amplifier
•Differential input
•Up to 150 mt. RG59B/U equal
•One trimmer fine equal.
•Broadcast quality
•To be fitted in DVR-MV/RK rack
DA204-M 10/12/2004
ELPRO Video Labs s.r.l.
Via della Praia, 4/A 10090 Ferriere di Buttigliera Alta (TO) ITALY
Tel.[phone] – Fax [phone]
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DA204 DUAL1X3 VIDEO DISTRIBUTION AMPLIFIER
1.0 OVERVIEW
The DA204 is a broadcast level video distributor that permits distribution of two video
signals towards three destinations each. The product, which consists of a plug-in, can be
inserted in the Elpro DVR-MV/RK 19" 2RU rack.
Like all Elpro plug-ins, the DA204 is self-powered and consists of two parts:
-The actual plug-in that can be inserted in the rack from the front;
-The rear box, called VRB204, that can be fastened with two screws in the rear part of the
rack.
Exploiting the construction characteristics of the DA204, it is possible to link two inputs so
as to obtain a 1x6 distributor. The link is activated using jumpers, directly on the rear part.
The video inputs of the DA204 are differential in order to guarantee immunity to induced
common mode disturbances. The 75Ωtermination is activated using jumpers directly on
the rear part.
The DA204 features a compensation circuit that compensates losses of the cable that
carries the signal to its input up to a length of 150mt.
The compensation circuit is calibrated using a multi-turn trimmer accessible form the front
panel of the unit and this operation must be carried out using the instrumentation
described in chapter 4.0
ELPRO Video Labs s.r.l.
Via della Praia, 4/A 10090 Ferriere di Buttigliera Alta (TO) ITALY
Tel.[phone] – Fax [phone]
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DA204 DUAL1X3 VIDEO DISTRIBUTION AMPLIFIER
2.0 FRONT PANEL
The following are provided on the front panel of the
DA204:
2.1 EQUAL CV1 trimmer for equalization of the
cable that carries the signal to input connector IN1.
2.2 EQUAL CV2 trimmer for equalization of the
cable that carries the signal to input connector IN2.
2.3 Green ON light
3.0 INSTALLATION
3.1 Insert the rear box VRB204 in the rear part of the DVR-MV/RK rack, supporting the
BNC connectors with the two screws provided.
Insert the DA204 plug-in in the front part of the rack fastening it with the two pawls
already screwed to the front panel of the plug-in.
3.2 Connect the DVR-MV/RK rack to the 230 Vac 50Hz mains supply
WARNING
Ground connection to the yellow/green (Y/G) wire
of the cable leading out of the rack is compulsory.
The green ON light on all the plug-ins inserted in the rack must light up.
WARNING
The DVR-MV/RK rack accepts any Elpro plug-in
that is compatible with the rack.
.
ELPRO Video Labs s.r.l.
Via della Praia, 4/A 10090 Ferriere di Buttigliera Alta (TO) ITALY
Tel.[phone] – Fax [phone]
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DA204 DUAL1X3 VIDEO DISTRIBUTION AMPLIFIER
3.3 Connect the two sources to be distributed to the BNCs identified as IN1 and IN2 with coax cable
RG59B/U.
Set the 75Ωdip-switches to ON so as to terminate the
incoming video signals correctly.
Leave dip-switches 1+2 set to OFF.
3.4 Connect the destinations to the BNCs identified as OUT1 1, 2, 3 for the outputs
relating to input 1 and OUT2 1, 2, 3 for the outputs relating to input 2, with coax cable
RG59B/U
WARNING
If the 1x6 video distributor function is required, proceed as follows:
a) Connect the source to be distributed to the
BNC called IN1.
b) Set the dip switch 75Ω1 to the off position
c) Set the dip-switch 75Ω2 to the ON position
d) Set dip-switches 1+2 to the ON position
ELPRO Video Labs s.r.l.
Via della Praia, 4/A 10090 Ferriere di Buttigliera Alta (TO) ITALY
Tel.[phone] – Fax [phone]
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DA204 DUAL1X3 VIDEO DISTRIBUTION AMPLIFIER
4.0 READ-OUTS AND ADJUSTMENTS
If the green light on the front panel of the DA204 is ON, this indicates that the correct
power voltage is present inside.
4.1 Equalization of losses due to the cable that carries the input signal
As already mentioned, the DA204 features an equalization circuit that eliminates any
losses of the cable that carries the signal to its input up to a length of 150mt.
The circuit is calibrated for the RG59B/U coax cable. Use of this type of cable is
recommended in order to obtain the best results.
Accurate calibration of the circuit provides a flat band of 0.1 dB up to 10MHz in any load
conditions and with any video signal.
The calibration procedure is as follows:
a) Via the cable to be equalized, connect a CCIR-17 type test signal to one of the two
inputs of the DA204.
b) Connect one of the 3 outputs of the DA204 to a waveform monitor or oscilloscope with
TV synchronism
ELPRO Video Labs s.r.l.
Via della Praia, 4/A 10090 Ferriere di Buttigliera Alta (TO) ITALY
Tel.[phone] – Fax [phone]
5

DA204 DUAL1X3 VIDEO DISTRIBUTION AMPLIFIER
c) Turn the EQUAL CV1 or EQUAL CV2 trimmer in a clockwise direction and observe the
waveform on the screen of the waveform monitor or oscilloscope until the following
conditions are matched:
d1) Correct amplitude of impulse 2T (Ref. A)
d2) Correct amplitude of impulse 20T (Ref. B)
d3) Trend of the color at the base of the 20T rectilinear (Ref. C)
d4) Luminosity bar rising and training edges (Ref. D) without
signs of overshoot or undershoot (Ref. E, F)
If the absence of the CCIR-17 signal, a
MULTIBURST signal can be used turning
the EQUAL CV1 or EQUAL CV2 trimmer
until the amplitude of the last BURST is
equal to that of the first.
When shipped, the DA204 is set as follows:
- EQUAL CV1 and EQUAL CV2 trimmer : zero (fully counterclockwise)
- Dip-switches 75Ω1 and 2 : ON
- Dip-switches 1+2 1 and 2 : OFF
ELPRO Video Labs s.r.l.
Via della Praia, 4/A 10090 Ferriere di Buttigliera Alta (TO) ITALY
Tel.[phone] – Fax [phone]
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DA204 DUAL1X3 VIDEO DISTRIBUTION AMPLIFIER
5.0 TECHNICAL DATA
Input type :Differential
Input coupling :AC
Input termination :Manual, by jumper
Input Linking capability :Manual by jumper to perform 1X6
Input level :Max 2Vpp
Input CMRR :> 55 dB at 50Hz
Input Ret. Loss :36 dB at 5MHz
Output Ret. Loss :48 dB at 5 MHz
Output isolation :43 dB at 5MHz
DC on output :±15mV
Frequency response :0,1 dB from 10Hz to 12 MHz
-3dB at 50 MHz (no equal.)
Delay :35 ns
Diff. gain :max 0,3°
Diff. amplitude :max 0,3%
LF response :<0,6% on 50Hz squarewave
Hum & noise :-80 dB unweighted
Equalization :150mt coax RG59B/U cable
Crosstalk (IN1 vs. IN2) :35 dB at 5 MHz
Main input :230 Vac 50Hz
Power consumption :3 VA
Operating temp. range :0÷45°C
Safety :According to EN60065
EMC :According to EN55103-1 and EN55103-2
CEMark
ELPRO Video Labs s.r.l.
Via della Praia, 4/A 10090 Ferriere di Buttigliera Alta (TO) ITALY
Tel.[phone] – Fax [phone]
ELPRO Video Labs s.r.l.
Via della Praia, 4/A 10090 Ferriere di Buttigliera Alta (TO) ITALY
Tel.[phone] – Fax [phone]
7 6

DA204 DUAL1X3 VIDEO DISTRIBUTION AMPLIFIER
6.0 NOTES
This product is warranted for 2 years from the date of purchase.
If the fault in the product is due to improper use or operations
carried out by third parties, the warranty is forfeited.
During the warranty period, Elpro will repair the faulty units free of charge.
The faulty units must be sent CARRIAGE FREE to the Elpro offices in Turin with a regular
accompanying note.
The units repaired will be returned CARRIAGE FORWARD to the addressee.
Outside the warranty period, Elpro will repair the faulty units EX its Turin offices, charging
the cost of the repair to the customer.
For any problems during installation of the DA204,
use the Elpro hot-line 011 9348778 or e-mail: [email protected]
ELPRO Video Labs s.r.l.
Via della Praia, 4/A 10090 Ferriere di Buttigliera Alta (TO) ITALY
Tel.[phone] – Fax [phone]
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