ADDER AdderLink X-Series Handbuch - Seite 13

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Signal loss compensation

Analog signals such as video and audio are susceptible to the effects of cable
resistance. When transmitted over long distances the degradations can begin to
produce noticeable results. To maintain a high quality service, the X-Series USB
extender modules feature both video and microphone signal loss compensation
features.

Video signal boost

Two separate boost features are available to ensure that the video signal remains
as crisp and clear as possible:
• Multi frequency video boost - this feature boosts all video frequencies to
counter the general effects of long cable runs. This boost feature is adjusted
using the small switches along the side of the REMOTE module.
• High frequency video boost - this feature affects only the higher video
frequencies that face additional degradation over long spans. This boost
feature is adjusted using the recessed dial at the front end of the REMOTE
module.
Note: If the video image remains fuzzy or distorted after applying both types
of boost, then there may be a 'skew' problem. This is caused by uneven
lengths within the twisted pairs of the link cables. To rectify such a problem
you may need to install an Adder Skew Compensator (part number: X-SC).

Multi frequency video boost

The function of the multi frequency boost is rather like that of a monitor's
contrast control. It should be set to according to the preference of the user, but
these REMOTE module switch settings offers a rough guideline:
Link cable length
Switch 2
0 - 25 metres
OFF
25 - 50 metres
OFF
50 - 75 metres
ON
75 - 100 metres
ON
Switch 3
OFF
ON
OFF
ON

High frequency video boost

This feature provides an extra boost for high frequency video signals which are
most greatly affected by cable losses. Before using this feature, ensure that the
multi frequency boost has been set for the approximate cable length.
To adjust high frequency video boost
1 Display a high contrast image with vertical edges on the remote monitor:
• Open a word processor, type the capital
letter 'H', or 'M' and increase the point
size to 72 or higher. For best results, the
background should be white and the
character should be black.
2 Insert a small flat-bladed screwdriver into the
slot of the small recessed dial on the REMOTE
module, marked 'COMPENSATION'.
3 Slowly turn the dial while viewing the screen
image, until the vertical edges of the test
pattern are crisp and clear with no shadowing:
• A BLACK shadow to the
right of the character
indicates UNDER
compensation - turn the
dial clockwise to increase
boost.
• A WHITE shadow
to the right of the
character indicates
OVER compensation
- turn anti-clockwise to
decrease boost.
Note: If you apply too much
boost, the monitor may go
blank. Turn the dial anti-
clockwise until the image
returns.
High contrast
White or black
black character
shadow on
on white
right side
background
- indicates
the need for
adjustment
Turn
clockwise
to
increase
boost
Turn anti-
clockwise
to
decrease
boost
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