Wallplate VGA and Audio on UTP Transmitter
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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 table 2.1 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.
You can point your browser to
http://www.hallresearch.com/files/articles/skew_adjust.gif
for an image that allows
you to adjust the compensation and also evaluate the amount of color skew in your
setup.
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 splitter can handle up to 5 v peak-to-peak
of 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.
