Extron Electronics RGB 202xi User Guide Rev. E - Manual (Page 21)

Extron • RGB 202xi Series • User’s Manual Page 3-2
This Boost range (red) can compensate for losses of
signal level or picture contrast due to increased cable
length. Depending on cable specifications, 50% Boost
(middle of red line) may improve picture quality for cable
lengths shorter than 500 feet for all computer signals
between 15-135 kHz. Set the Boost at 100% (fully
clockwise) for cable lengths longer than 500 feet for all
computer signals 15-135 kHz. Always observe the
displayed image while using this adjustment.
Because the RGB 202 xi is capable of driving signal cables
up to 1000 feet long (depending on the signal frequency),
Extron recommends using High Resolution, BNC type
coax cables. Standard RG59 cable is good for NTSC
video and low resolution computer RGB signals, but it
limits video quality on medium and high resolution
computer RGB signals.
Peaking Control
This control is similar to a sharpness adjustment on a data
monitor. A sharper image will result from adding some
peaking adjustment for all computer signals, regardless of
the cable length used. The Peak Control compensates for
mid and high frequency RGB Video Bandwidth response
in data monitors and projectors, as well as for signal loss
due to cable capacitance. On most cable lengths of 250
feet or more, set the Peak Control at 100% for optimum
picture quality (fully clockwise). Always observe the
displayed image while using this adjustment.
Blue Enhance
Because blue text is difficult to read, this adjustment
allows the user to improve on this by changing the color
slightly. The Blue Enhance adjustment allows for mixing
just the right amount of blue information with the green
signal to make the text a more readable, blue-green color.
This only occurs on TTL signals such as IBM 3179, CGA,
and EGA graphic cards. This adjustment will only affect
TTL signals (Input #1). Always observe the displayed
image while using this adjustment.
Operation • Controls and Indicators
Extron • RGB 202xi Series • User’s Manual Page 4-1
RGB 202 xi Model Differences
There are three other models of the RGB 202 xi, each of
which has additional features. This chapter covers only
those differences; all standard features are in the other
sections.
RGB 202 VTG (Video Test Generator)
This model includes some of the features of Extron’s
Video Test Generators. On the front panel (shown below)
there is a section marked “Mini VTG”. When the toggle
switch marked “202” and “VTG” is in the VTG position, a
test pattern is generated on the output of the RGB 202
VTG. In the “202” position, the interface functions as a
normal RGB 202
xi.
In the VTG mode, the rotary switch is used to select one
of four patterns for one of four display types. These are:
Quadrant Format PixelxLine H.kHz V.Hz
1 VGA3 640x480 31.5 60
Position 1 Crosshatch pattern
Position 2 H Pattern, back and white
Position 3 8-level Split Grayscale pattern
Position 4 8-Color Bar pattern
2 MAC13 640x480 35 60
Position 5 Crosshatch pattern
Position 6 H Pattern, back and white
Position 7 8-level Split Grayscale pattern
Position 8 8-Color Bar pattern
3 VESA3 1024x768 48.4 60
Position 9 Crosshatch pattern
Position 10 H Pattern, back and white
Position 11 8-level Split Grayscale pattern
Position 12 8-Color Bar pattern
4 SGI 1280x1024 64 60
Position 13 Crosshatch pattern
Position 14 H Pattern, back and white
Position 15 8-level Split Grayscale pattern
Position 16 8-Color Bar pattern
The patterns are:
Crosshatch
H Pattern Grayscale 8-Color