UV-16 Family of Mini-Cat
®
Senders
9
3.2.2 UTP Cable Recommendations
UTP cables have 4 twisted pairs inside. The video transmission over
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 the cable at a fixed speed,
the arrival times of signals can be skewed in a long cable (those that
have to travel farther arrive later and the corresponding color shifts to
the right).
This is seen on the monitor as separation, or lack of convergence in
colors. For example a vertical white line on the screen may look to
have a red tinge on the left edge and blue tinge on the right edge.
This effect gets worse at high resolutions, high refresh rates, long
cables (in excess of 200 feet), and depends on the cable construction
itself. Hall Research highly recommends the use of UTP cables
specifically constructed for video transmission. In these cables the all
the twisted pairs are the same length. They are available from several
sources including Hall Research (part numbers shown below).
Zero-Skew CAT5 Cable for use with Hall Research CAT5 Products
PART NUMBER
CUTP-Z-1000-BLK 1000 ft.
Zero-Skew CAT5 cable. Bulk spool of 1000 ft
CUTP-ZP-1000-BLK 1000 ft.
Zero-Skew CAT5 cable. Bulk spool of 1000 ft
Plenum Rated
If you are going to use commercial grade UTP cable, then we
recommend using Cat5 or Cat5e rather than Cat6, since the twist ratio
match is better in Cat5 cable.
RED
GREEN
BLUE
RED
GREEN
BLUE
Figure 3.1
