Hall-research UV8-S User Manual download pdf (Page 9)

4 or 8 Channel Splitter PC Video & Power over Twisted-Pair Sender

4.1 Contacting Hall Research

If you determine that the UV4-S or UV8-S is malfunctioning, do not attempt to repair

the unit instead, contact Hall Research Technical Support at 714-641-6607.

Before you do, make a record of the history of the problem. We will be able to

provide more efficient and accurate assistance if you have a complete

description.

4.2 Shipping and Packaging

If you need to transport or ship your unit:

• Package it carefully. We recommend that you use the original container.

• Before you ship the units back to Hall Research for repair or return,

4.3 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), ensure the cable length for the resolution and refresh rate used is

within the recommended limits. If you still have a fuzzy image, try reducing

the refresh rate and/or resolution of the video source.

2. Image exhibits steady or rolling horizontal color “hum” bars

This is usually an indication of improper grounding 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 volts peak-to-peak of ground noise between the two

locations, but ground potential differences more than this can show up on

video.

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

sender and the interfering source, or use shielded twisted pair (STP) CAT5

cables.

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Hall-research UV8-S User Manual Page 9