Extron electronic RGB 202 VS SL2 RGB 202 VTG Video Test Generator, Peaking Control, Blue Enhance

RGB 202xiModel Differences

There are three other models of the RGB 202xi, 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 202xi.

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

Operation • Controls and Indicators

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 202xi 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.

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