KRAMER ELECTRONICS LTD
7
6.2 Connecting to Video Devices
1. Connect a video source to the video input BNC of the
611T
machine using recommended cables, taking
care that all connections are correct.
2. Connect the appropriate optic fiber (that is, Multimode fiber) to the “ST” type
TO FIBER
connector of
the 611T. Be sure that only Multimode fiber is used.
The use of a wrong component in the system will
cause a total malfunction of the fiber optic system.
3. Connect the remote side of the optic fiber to the
FROM FIBER
“ST” connector of the
611R
receiver.
Be sure that the connection is firm and positive.
4. Connect a coaxial cable between the
OUTPUT
BNC of the
611R
to the input of the video acceptor.
5. Connect the
611T
and
611R
to an appropriate 12V DC source, observing proper polarity (the provided
Kramer wall transformer is recommended). The ON LEDs on both the
611T
and
611R
should light up.
6. Operate your video source and acceptor.
7 USING the 611T AND 611R
7.1 Adjusting the Devices
Both the
611T
and the
611R
come with video level trimming devices. In normal use, the trimmers should not be
touched, as the machines are pre-adjusted at the factory for transparent operation. If the optic fiber and
connectors are of good quality and the operating range is not exceeded, the trimmers should be left in the factory
preset state.
If a signal definition loss is encountered (the video image gets unsharp or “smeared” or the color information
looses clarity and color noise appears) the first thing to do is to check the cables and connectors (both the video
and the optic fiber) and the quality of the video source and the video receiver. The quality of the video source
may be checked by direct connection of the source to a monitor, bypassing the optic fiber system. If everything
looks fine but the video image is still bad, then the following steps should be taken (bear in mind though, that
the factory preset for 1:1 transparency will be lost):
7.1.1 Adjusting HF (High Frequency) loss
First, with an isolated plastic screwdriver, carefully adjust the HF trimmer of the
611T
machine and monitor the
results at the remote location (with a second person at the remote location.) If there is an improvement in the
video signal clarity, and noise is not accumulated, but the improvement is not sufficient - even at the maximal
setting of the trimmer, repeat the process at the
611R
side (remote location.)
7.1.2 Adjusting video levels
If the video signal is too dark and faint at the remote location, the video level should be adjusted. Again, in
normal use, the trimmers should not be touched, as the machines are pre-adjusted for transparent operation at
the factory. If the optic fiber and connectors are of good quality and the operating range is not exceeded, the
trimmers should be left at the factory preset state.
The video trimmer adjusting levels, if incorrectly set, may cause severe image degradation. If the video signal
entering the
611T
is at normal video levels (1Vpp) then readjusting the level will deteriorate the system’ s
linearity. The video signal level entering the
611T
should be monitored with an oscilloscope or another video
measurement device.
The adjustments– after verifying that there is indeed a deterioration of the video signal level- is first done at the
receiving end, the
611R
. Using an insulated screwdriver, adjust the LEVEL trimmer at the
611R
side. If there is
an improvement in the video signal level (the image gets brighter) and noise is not accumulated, but the
improvement is not sufficient - even at the maximal setting of the trimmer, repeat the process at the
611T
side
(local transmitting location.)
It is not very likely that the signal level will deteriorate, unless there is something
wrong with the system – either the distance of operation is too large, the video signal is double loaded or a
wrong combination of transmitter/receiver/fiber is used!
