Hall Research UV1-CV - Manual (Page 11)

ss Miniature VGA over CAT5 Extension System
9
4. Troubleshooting
1. Fuzzy, blurry, or ghosting image at remote location
If you have a stable image but it looks somewhat blurry (object or character
edges are not sharp), try to adjust the compensation first. When the trim-pot
is turned fully CCW there is no compensation. As you turn the pot clockwise,
you are applying compensation. Look at the screen and slowly turn the pot
clockwise. Notice what happens to the right of solid horizontal lines (as in
figure 3.1). If you still have a fuzzy image, try reducing first the refresh rate
and then the resolution of the PC.
2. Shaking image or periodically blanking monitor
Although CAT5 cable uses twisted pairs to transmit the signals from the
splitter to the receivers to reduce the amount of EMI coupled noise from
external sources, a strong electromagnetic noise field can cause instability in
the signal. Usual sources of this form of noise coupling are high current AC
lines or other high-density data and/or control cables that run adjacent to and
parallel with a substantial length of the CAT5 cable.
To eliminate this, either separate the Cat 5 cable of Mini-Cat® from the
interfering source or use shielded CAT5 cables. Note that separating the
CAT5 cable from the EMI source by a few inches is often sufficient to
eliminate this problem.
3. The PC does not recognize a Plug-and-Play monitor
If the PC’s operating System is setup to detect a plug-and-play monitor
(usually in Display Properties Advanced Settings), it may have trouble finding
a monitor. If the PC does not produce an image due to this, disable the plug-
and-play monitor detection in the PC’s operating system Display properties.
4. Substituting power supplies
The sender and receiver rely on the power adapter that is supplied with them.
Do not substitute any other power supply or DC power source