Active Components


For RGBHV (VGA/XGA)

The significant difference between the transmission of TV images and computer image is the number of lines per image and the image change frequency.

The number of lines for TV images is odd.
The number of lines for computer is even.

This makes the two signal types incompatible.

Usually the analog output on our PC is a 15-pin HD-socket.
Five signals are available here, each transmitted on one line:
Line 1 Red Analog image signal red; 0.7 Vss on 75 Ohm
Line 2 Green Analog image signal green; 0.7 Vss on 75 Ohm
Line 3 Blue Analog image signal blue; 0.7 Vss on 75 Ohm
Line 4 Horizontal frequency Line change impulse TTL-level (2-10 Vss)
Line 5 Vertical frequency Line change impulse TTL-level (2-10 Vss)

The signals for horizontal and vertical deflection differ widely, depending on the PC manufacturer. This also handicaps transmission over long distances.
The higher image resolutions on the PC require significantly higher band widths (stated in MHz).
The following chart clarifies the issue.
Resolution
Bandwidth in MHz
Width
  
Height
  Resolution
Image Points
50 Hz
60 Hz
72 Hz
100 Hz
640 x 480 VGA 307.200 46.08 55.29 66.36 92.16
800 x 600 SVGA 480.000 72.00 86.40 103.68 144.00
1024 x 768 XGA 786.432 117.96 141.57 169.86 235.92
1152 x 864 XGA+ 995.328 119.44 149.31 214.98 298.59
1280 x 768 WXGA 983.040 147.45 176.94 212.34 294.90
1280 x 1024 SXGA 1.310.720 196.62 235.92 283.11 393.21
1400 x 1050 SXGA+ 1.470.000 220.50 264.60 317.52 441.00
1600 x 1024 SXGAW 1.638.400 245.76 294.90 353.88 491.52
1600 x 1200 UXGA 1.920.000 288.00 345.60 414.72 576.00
1680 x 1050 WSXGA+ 1.764.000 264.60 317.52 381.03 529.20
1920 x 1080 HDTV 2.073.600 311.04 373.26 447.90 662.08
1900 x 1200 UXGAW 2.280.000 342.00 410.40 492.48 684.00
1920 x 1200 WUXGA 2.304.000 345.60 414.72 497.67 691.20
2048 x 1536 QXGA 3.145.728 471.87 566.22 679.47 943.72


To transmit a Powerpoint presentation with a resolution of only(!) 800 x 600 pixels and a screen change frequency of 60 Hz we need a band width of at least 30 MHz.
The following distribution amplifiers have a band width of > 400 MHz (depending on the damping value on the connection cables)


KR-VP200NK
 KR-VP200NAK
 KR-VP200DXL
 KR-VP2L


ORDER-NO. Signal Band width
 IN OUT Connect. Other characteristics
KR-VP200NK VGA / XGA 430 MHz 1 2 HD-15 -
KR-VP200NAK VGA / XGA + bal. St-audio 430 MHz 1 2 HD-15 Audio: input: 3.5 mm socket,
output: 2 x 3.5 mm socket/ 2 x screw clamping
KR-VP200DXL VGA / XGA 400 MHz 1 2 HD-15 Poti: level;
EQ switch: ID-bit
KR-VP210XL VGA / XGA 400 MHz 1 1+loop HD-15 Poti: level;
EQ switch: ID-bit
KR-VP2L VGA / XGA 400 MHz 1 1 HD-15 -

All other KRAMER products are available short-term.