HRT Mini-Cat UV-1, Manual

Page: 8 / 16

Miniature VGA over CAT5 Extension System
6
Figure 3.1
3. Configuration & Operation
The Mini-Cat® Receivers are equipped with an adjustment to improve
image quality when using long cables. The adjustment is made via a
single turn trim-pot located next to the power connector on the receiver.
When using a long cable, with no
compensation, any solid horizontal line,
tends to smear to the right. For example
in the image shown, observe the dark
black line at the bottom of the window
and see how it is smearing to the right
(not changing to white abruptly as it
should). This is the effect of long cable
on the signal.
You can turn the trim-pot to eliminate
these streaks as shown on the 2nd
picture. If you add too much
compensation to the signal, then an
opposite effect may be observed, i.e.
black lines smear to the right as white
lines or vice-versa. The 3rd picture
shows the case where too much
compensation is added.
In general, when using long cables, the
image quality is a function of resolution
and refresh rate. If possible, set the
refresh rate to 60 Hz at any resolution.
Also for best results at long distances,
try to use standard Category-5 Cable (instead of
CAT5e or CAT6 since CAT5e and CAT6 cables may have widely
dissimilar twist ratios of the wire pairs in the cable that may result in
noticeable color skew).
No-Compensation
Perfect Compensation
Too much Compensation