FM Systems VDA414/C User manual

VDA414/C
VIDEO DISTRIBUTION AMPLIFIER
INSTRUCTION MANUAL
IB 6409-01
COPYRIGHT
ALL RIGHTS RESERVED
8-10-2003

VDA414/C
VIDEO DISTIBUTION AMPLIFIER
TABLE OF CONTENTS
PAGE
SHIPPING INSPECTION 2
HOW AND WHERE TO MOUNT THE UNIT 2
MODUAL CARD INSTALLATION 2-3
HOW TO CABLE THE VIDEO AMPLIFIER 3
POWER SUPPLY INSTALLATION 3
SET-UP OF THE VIDEO AMPLIFIER 3
OPERATION 4
OPERATION OF CLIPPER OPTION 5
FRONT PANEL CONTROLS AND INDICATORS 5
HOW TO SET OUTPUT CONFIGURATION JUMPERS 5
CARE AND MAINTENANCE OF THE UNIT 5
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SHIPPING INSPECTION
Remove from shipping container and inspect for shipping
damage. The VDA414/C is a Slide in Card that fits into the
RMS-400 Mainframe and Power Supply. The card is supplied with a
retaining screw (attached to the PC Board), a Front Label
Designator and this instruction book. If an RMS-400 Mainframe and
Power Supply have been purchased with Card, the Card will be
installed into the Mainframe with labels attached and the
retaining screw engaged and locked.
HOW AND WHERE TO MOUNT THE UNIT
Select a position for the RMS-400 that is near the
video signal or other equipment that needs video distribution. The
placement is not critical. Then install the VDA414/C PC CARD in
any unused CARD SLOT that is empty. Follow the instructions for
card installation, be sure not to apply excessive force to the
card during installation.
MODULE CARD INSTALLATION
1. Select one of the un-used nine positions to be occupied by
the new circuit board module.
2. Remove the blank label in that position by peeling it off of
the front panel. Peel the label slowly to remove all of the
label and adhesive. Any remaining adhesive may be removed by
rubbing the surface with your thumb. WARNING DO NOT USE
SOLVENTS TO REMOVE THE LABEL ADHESIVE. The solvent could
damage the equipment cards or cause a fire.
3. Peel the backing off of the new label and apply it to the
front panel of the RMS-400 rack in the position of the new
card. Align the new label with the screw head in the hole in
the lower right hand corner of the label, and then align the
center thumbscrew with the clearance hole in the front panel.
This should cause the label to be straight and vertical. When
the label is in place press firmly the secure the label.
4. Then remove the thumb-screw retainer from the product card,
it is located at the front of the card and is removed by
rotating the knob counter-clock-wise.
5. Select any and all product options on the specific card.
6. Next slide the card into the card guides at the rear of the
RMS-400. Be sure that the notch in the circuit card is facing
forward and down. Push the card all the way to the front of
the rack until it stops. DO NOT APPLY EXCESSIVE FORCE TO THE
CARD.
VDA414C.ISB Page 2 of 5

MODULE CARD INSTALLATION (cont.)
7. Insert the thumb-screw that was removed in step 5 while
rotating it in a clock-wise direction. When it begins to
thread into the card, continue until it is finger tight.
CAUTION TIGHT BY HAND ONLY, DO NOT USE TOOLS TO TIGHTEN THE
THUMB-SCREW. OVER TIGHTENING WILL DAMAGE THE CIRCUIT CARD.
8. Attach any cables or wires necessary for operation. If it is
easier, you can attach the cables before inserting the PC
card into the rack.
Most circuit board modules have several adjustments
which are carefully factory set with precision instruments
for optimum performance. Change only those which must be
adjusted, some controls when mis-adjusted produce little
change under normal operating conditions, but can seriously
reduce the ability of the unit to function correctly under
other conditions which may be encountered. Therefore, if you
must adjust a control, place a mark on it before moving it,
so that it may be returned to its original setting with
reasonable accuracy.
HOW TO CABLE THE VIDEO AMPLIFIER
Connect a BNC cable from your source video to the "A-D VIDEO"
of the VIDEO AMPLIFIER. The "VIDEO INPUT" is internally terminated
by a precision 75 Ohm termination to match standard video cable.
Next connect a BNC cable from the "A-D OUTPUT" connector on
the VIDEO AMPLIFIER to the equipment you wish to have video
supplied to. The "VIDEO OUTPUTS" of the VIDEO DA have a 75 Ohm
output impedance to match standard video cable. Be sure the
equipment being driven is properly terminated with a precision 75
Ohm termination to insure correct video level.
POWER SUPPLY INSTALLATION
Power for the VDA414/C is supplied by the RMS-400 Mainframe.
It supplies the card with +/- 12 VDC to power the card.
SET-UP OF THE VIDEO AMPLIFIER
The VDA414/C is set to unity gain 1 Volt in and 1 Volt out at
the factory. A front panel Video Level control may be adjusted to
set the level for optimum performance. See “OPERATION OF CLIPPER
OPTION” for optional clipper control operation.
VDA414C.ISB Page 3 of 5

OPERATION
The VDA414 Video Distribution Amplifier is used to amplify
and distribute any B/W or color NTSC, PAL, or CCTV video signal.
The unique design allows the user to change the inputs and output
to make any of the following amplifier configurations.
SELECTABLE USER CONFIGURATIONS:
INPUTS OUTPUTS VIDEO CHANNELS
1 In 2 Out 4 Separate Channels
1 In 4 Out 2 Separate Channels
1 In 6 Out 1 Channel with an extra 1 In/2 Out
1 In 8 Out 1 Video Channel
2 In 4 Out 2 Separate Channels
The video level for each input channel is adjustable to allow
the user to set the proper level for the down stream equipment.
This adjustment is useful when feeding signals to a DVR (Digital
Video Recorder) or other digital devices. DVR’s and digital
devices are very sensitive to over and under video level, so the
ability to adjust the level prior to the device is sometimes
necessary.
OPERATION OF CLIPPER OPTION
This Video DA is also available in a Clipper Clamper version.
The VDA414C has the ability to clamp out low frequency
interference and distortion by back-porch clamping the video
signal. It also has a front panel adjustment for clipping level
that allows the operator to set a hard clip level on the video to
prevent over modulation of the down stream equipment. A front
panel L.E.D. indicates the point of video clip. The ordering
nomenclature for the Clipper Clamper version of this product is
VDA414C.
FRONT PANEL CONTROLS AND INDICATORS
A green "PWR ON" indicator on the front panel shows
that the video DA is active. The adjustable control on the
front panel set the video level output. Clock-wise rotation
increases the video output. The front panel Video Clipper
control (on VDA414C version) can be used to clip video levels
the exceed 120 I.R.E. units. By adjusting the Clip Control
you can set video clipping to prevent fast transient over
level signals from disrupting down stream equipment. When
video is being clipped a RED L.E.D. will illuminate to
indicate the clipping of video.
VDA414C.ISB PAGE 4 OF 5

HOW TO SET OUTPUT CONFIGURATION JUMPERS
The VDA414/C can be configured by using the table
below. Determine the output configuration you desire and set
the jumpers as indicated in the table. If a jumper is not
selected the Jumper Clip should be hung on one pin to retain
the jumper on the card. All output channels are dual output.
The unit comes factory set for 4 IN and 2 per channel output.
CONFIGURATION
# OF # OF SET INPUT OUTPUT
INPUTS OUTPUTS JUMPERS ON CHANNELS CHANNELS
4 2 PER CH. 1-4-7 A-B-C-D A-B-C-D
2 4 PER CH. 1-3-5-8 A D A/B C/D
1 6 1-5-6-8 D B C D
1 8 2-3-5-6-8 D A B C D
CARE AND MAINTENANCE OF THE UNIT
Care should be taken not to subject the VDA414/C to extreme
moisture or temperatures outside normal operating range. There are
no periodic maintenance adjustments to be made on the VDA414/C
other than the front panel video level set control and Clipper
control if you have the VDA414C option. If the unit does not
function properly it should be returned to the factory for repair.
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