User manual

KRAMER: SIMPLE CREATIVE TECHNOLOGY
Solutions to Common Problems
10
Appendix C DC Restore to fix Green Shift of AC Coupled
Signals
The standard Cobra product is designed to function with DC coupled signals
with the black level referenced to 0 volts. Nearly all VGA cards function this
way. However, some media servers or digital camera devices provide AC
coupled signals and can cause a green color shift in the video. This is a result
of the sync clamping on the Red and Blue channels in the Cobra. The
CobraT2 transmitter has been designed with full DC restore capability. A
simple switch setting is all that is required.
The following diagrams show the switch location and settings for the Cobra
Universal Transmitter assembly.
Note: Switch settings other than shown below may result in unpredictable
performance and are not supported by Kramer.
Figure 3: DC Restore / AC Coupling Options
DC restore / AC coupling options:
Disable: AC Coupling to A
(Default) DC Restore to A
Internal SW5 position 1 OFF (default)
Mode 1 AC Coupling to B
Enable DC Restore to B
Internal SW5 position 1 OFF (default)
Mode 2 AC Coupling to B
Enable DC Restore to A
Internal SW5 position 1 ON