Video Formats - for RGBHV (VGA/XGA)

The significant difference between the transmission of TV images and image rendition for PC technology is the number of lines per image and the image change frequency.

The number of lines for TV images are unevenly numbered.
The number of lines for PC technology are evenly numbered.

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 being transmitted on one line:
Line 1 Red Analog image signal red; 0,7 Vss an 75 Ohm
Line 2 Green Analog image signal green; 0,7 Vss an 75 Ohm
Line 3 Blue Analog image signal blue; 0,7 Vss an 75 Ohm
Line 4 Horizontal frequency Line change impulse TTL Pegel (2-10 Vss)
Line 5 Vertical frequency Line change impulse TTL Pegel (2-10 Vss)

The signals for horizontal and vertical deflection differ widely, depending on the PC-manufacturer. This also handicaps transmission over longer distances. The higher image resolutions on the PC require significantly higher band widths (stated in MHz) for cable transmission. The following chart clarifies the issue.


width   height name pixels 50 Hz 60 Hz 72 Hz 100 Hz
640 x 480 VGA 307.200,00 15.360 18.432 22.118 30.720
800 x 600 SVGA 480.000,00 24.000 28.800 34.560 48.000
1024 x 768 XGA 786.432,00 39.321 47.185 56.623 78.643
1152 x 864 XGA+ 995.328,00 49.766 59.719 71.663 99.532
1280 x 768 WXGA 983.040,00 49.152 58.982 70.778 98.304
1280 x 1024 SXGA 1.310.720,00 65.536 78.643 94.371 131.072
1400 x 1050 SXGA+ 1.470.000,00 73.500 88.200 105.840 147.000
1600 x 1024 SXGAW 1.638.400,00 81.920 98.304 117.964 163.840
1600 x 1200 UXGA 1.920.000,00 96.000 115.200 138.240 192.000
1680 x 1050 WSXGA+ 1.764.000,00 88.200 105.840 127.008 176.400
1920 x 1080 HDTV 2.073.600,00 103.680 124.416 149.299 207.360
1900 x 1200 UXGAW 2.280.000,00 114.000 136.800 164.160 228.000
1920 x 1200 WUXGA 2.304.000,00 115.200 138.240 165.888 230.400
2048 x 1536 QXGA 3.145.728,00 157.286 188.743 226.492 314.572

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-VP200N KR-VP200NA KR-VP200DXL


ORDER-NO. Signal Band width Level IN OUT Connection Other characteristics
KR-VP200N VGA / XGA 400 MHz 0.7Vpp 75 Ohm;
H+V = TTL-level		 1 2 HD-15 -
KR-VP200NA VGA / XGA + bal. st-audio 440 MHz 0.7Vpp 75 Ohm;
H+V = TTL-level		 1 2 HD-15 Audio: Screw clamp
KR-VP200DXL VGA / XGA 400 MHz 0.7Vpp 75 Ohm;
H+V = TTL-level		 1 2 HD-15 Poti: Level;
EQ switch: ID-bit
KR-VP210XL VGA / XGA 400 MHz 0.7Vpp 75 Ohm;
H+V = TTL-level		 1 1+Loop HD-15 Poti: Level;
EQ switch: ID-bit

All other KRAMER-products are available on short-term.