Hall Research UV232-8 - Manual (Page 10)

Compact CAT5 Video/RS232 Splitters and Receivers
8
screwdriver and starting from CCW slowly turn the pot CW until the
image is perfectly clear. Fully CCW corresponds to no compensation
(recommended for lengths of 100 ft or less), and fully CW corresponds
to 1000 feet. Be careful not to over-compensate the video image.
The video quality at the remote station depends on: (1) the length of the
CAT5 cable, (2) video resolution setting, and (3) refresh rate setting.
In general, at low and mid resolutions, excellent image reproduction is
provided at up to 1000 feet. At high resolution and refresh rates perfect
image reproduction can be achieved at shorter distances (see table 3.1
below). Using longer cables or higher resolution rates will still produce
an image, but the reproduction quality will be reduced.
Refresh Rate
60 Hz 75 Hz 85 Hz
800x600 1000 ft 1000 ft 1000 ft
1024x768 1000 ft 800 ft 750 ft
1280x1024 750 ft 650 ft 600 ft
Resolution
1600x1200 650 ft 600 ft 500 ft
3.2.2 UTP Cable Recommendations
UTP cables have 4 twisted pairs inside. The UV232/UR232 video
transmission on UTP uses 3 individual pairs for each color (Red,
Green, & Blue). As shown in figure 3.1 above, a characteristic of
Category-5/5e/6 cable is that the pairs of wires are twisted at different
rates. Therefore, for a given length of Cat-5 cable the total length of a
particular pair could be longer than others. Since the signals travel in
RED
GREEN
BLUE
RED
GREEN
BLUE
Figure 3.1
Table 3.1
Maximum
Recommended
Cable Lengths