Hall Research Technologies UVA-4 User Manual

Also see for UVA-4: Manual

Contents

Hall Research Technologies UVA-4 User Manual Manual pdf 13 page image

4 or 8 Channel Splitter PC Video & Audio over Twisted-Pair Receivers114.3 Problem Solving FAQ1. Fuzzy, blurry, or ghosting image at remote locationIf you have a stable image but it looks somewhat blurry (edges are notsharp), make sure that you have adjusted the receiver unit’s HFcompensation correctly. In addition, check the recommended table of maxdistance vs. resolution to see that you have not exceeded the maximumrecommended cable lengths. If you still have a fuzzy image, try reducingthe refresh rate and/or resolution of the video source.2. Image exhibits steady or rolling horizontal color “hum” barsThis is usually an indication of improper grounding at the sending end, thereceiving end, or both. Verify that the AC line is properly wired and that aprotective ground (green) wire is established with NO potential differencebetween both the sender and receiver locations. The UTP splitter canhandle up to 5 volts peak-to-peak of ground noise between the twolocations, but ground potential differences more than this can show up onvideo.3. Shaking image or periodically blanking monitorInherently, balanced signal transmission over twisted pair offers goodimmunity to EMI coupled noise from other external sources. However, astrong electromagnetic noise field can cause instability in the signal.Usual sources are high power AC lines or data and/or control cables thatrun adjacent to and parallel with a substantial length of the CAT5 cable. Toeliminate this, either place a distance between the CAT5 cables from thesender and the interfering source, or use shielded twisted pair (STP) CAT5cables.4. Poor audio quality at the receiving endOnly use powered speakers with the splitter and receivers. It is also goodpractice to set the audio level (volume) output of the PC about 1/2 to 2/3from the maximum and use the volume knob of the speakers to adjust thevolume to the desired level. A low volume signal output from the PCreduces the signal-to-noise (S/N) ratio, whereas too high output amplitudecan cause saturation and clipping to occur.

/ 16

Related manuals for Hall Research Technologies UVA-4