Compact CAT5 Audio/Video Splitters and Receiver
10
4. Troubleshooting
4.1
Problem Solving FAQ
1.
Fuzzy, blurry, or ghosting image at remote location
If you have a stable image but it looks somewhat blurry (edges are not
sharp), make sure that you have adjusted the receiver unit’s
compensation pot correctly. Also check to see that you have not
exceeded the maximum recommended cable length. If you still have a
fuzzy image, try reducing the refresh rate and/or resolution of the PC.
If you determine that you have excessive color skew, then you must
either consider using Zero-Skew UTP cable, or if that is not possible,
use a secondary device whose job is to correct the color skew (please
contact HRT for details).
Your sender has multiple RJ45 output connectors. When a long CAT5
cable is plugged in any of the outputs, the unit expects a receiver unit at
the far end for proper termination. Therefore unplug the un-terminated
CAT5 cables from the splitter unit.
2.
Image exhibits steady or rolling horizontal color “hum” bars
This is usually an indication of improper grounding either at the
sending end, the receiving end, or both. Verify that the AC line is
properly wired and that a protective ground (green) wire is established
with NO potential difference between both the sender and receiver
locations. The UTP sender can handle up to 5 v pp ground noise
between the two locations, but no more.
3.
Shaking image or periodically blanking monitor
Inherently, balanced signal transmission over twisted pair offers good
immunity to EMI coupled noise from other external sources. However,
a strong electromagnetic noise field can cause instability in the signal.
Usual sources are high power AC lines or data and/or control cables
that run adjacent to and parallel with a substantial length of the CAT5
cable. To eliminate this, either place a distance between the CAT5
cables from the splitter and the interfering source, or use shielded
twisted pair (STP) CAT5 cables.
