VGA Balun II Application Guide VGA Balun II (500040, 500041, 500042, 500043) Application Guide Version 1.
VGA Balun II Application Guide Purpose The purpose of this document is to explain how to apply the VGA Balun II under different operating conditions and to discuss issues not covered in the Installation Guide that comes with the product.
VGA Balun II Application Guide VGA Balun II versus VGA Balun (500010/11/14) The VGA Balun II is positioned toward the new and pre-installed UTP market and is designed to support short and medium distance/resolution applications via Cat5 UTP in the VGA environment in the majority of VGA applications. The VGA Balun II is not compatible with the 500010, 500011 and 500014. The VGA Balun II (500040, 500041, 500042, 500043) does not replace the VGA Balun (500010, 500011, 500014) completely.
VGA Balun II Application Guide Application Table There are currently three (3) product items in the VGA Balun range.
VGA Balun II Application Guide Displays Equipped with DB15HD Receptacle Due to the product design, the VGA Balun-PC Side (500010) must be connected to the source and the VGA Balun-Monitor Side (500011, 500014) must be connected to the display. Most plasma and LCD screens have a DB15HD receptacle and therefore it is recommended to use the 500014. If this is not possible, then connect a short VGA male-to-male extension cable or gender changer between the 500011 and the display.
VGA Balun II Application Guide Flutter Flutter occurs when the background fluctuates between light and dark. This symptom may be due to problems with the grounding between the VGA equipment or the connection may be picking up some external interference from a nearby power transformer.
VGA Balun II Application Guide When is the Reset Button Required Due to the fact that some displays are more sensitive than others and may not sync up correctly, a RESET button is provided on each VGA Balun II to allow these displays to re-synchronize. A RESET button is on both the transmit and receive side baluns for greater convenience and ease of access.
VGA Balun II Application Guide monitor to correctly sync up. The VGA Balun II requires some additional energy prior to reaching its normal operating level. Bandwidth and Operation at SXGA (100MHz) Although the VGA Balun has a bandwidth specification of 60 MHz, it will still operate at screen resolutions with higher bandwidth; i.e.; SXGA (100MHz). This is because the bandwidth roll-off above 60 MHz is gradual and not sharp, allowing the higher frequency components through.
VGA Balun II Application Guide VGA Distribution Amplifiers In some applications it is necessary to distribute a VGA source to multiple screens. The VGA Balun II works in conjunction with commercially available VGA distribution amplifiers (DA). In order to operate correctly it is necessary that the VGA outputs on the DA be fully isolated in order not to interfere with the synchronization pulses. The following page provides a list of some of the VGA distribution amplifiers on the market.
VGA Balun II Application Guide Startech:http://www.startech.com/ststore/itemdetail.cfm?ProductID=ST122&topbar=topbarav.htm VGA Dual head Cards As an alternative to inserting a VGA distribution amp in front of the VGA Balun, some vendors offer dual head VGA cards. When used, a pair of VGA Baluns may be connected to each port thereby providing a neat point-to-point connection. The advantage of this approach is that there are fewer points of failure and no extra power is required.
VGA Balun II Application Guide Classroom Projector Application In many schools, classrooms now feature an overhead projector connected to an instructor’s PC or laptop. The instructor typically sits at a PC or laptop at the front of the class while an overhead projector displays the screen that appears on the instructor’s PC. The instructor usually needs to be able to view the local PC screen while the class is watching the projection display.
VGA Balun II Application Guide Point-of-Sale Restaurant Application In the restaurant and fast-food industry, a point-of-sale (POS) terminal is typically connected to a display monitor in the kitchen. The monitor displays information generated by the POS terminal about customer orders to be prepared. The kitchen monitor is often a VGA monitor connected to a PC-based POS terminal.
VGA Balun II Application Guide Ground Loop Video ground loop is caused by the video source and video display being connected to grounds that are sitting at difference voltage levels, giving rise to a difference ins voltage potential and consequently a current flow between the two devices. Ground loop problems manifest themselves visually by displaying horizontal or wavy bands (“hum” bars) that move up the screen.
VGA Balun II Application Guide Newer Plasmas without Tint/Color Adjustment It has been found that on some newer plasma displays, there is no color/tint adjustment. Therefore, when used with the VGA Balun, as the maximum distance approaches the limit, there may be a visible loss of certain color components due to the inability of the plasma display to automatically compensate for a weaker color component.
VGA Balun II Application Guide VGA Cabling Sources The following table provides a list of vendors who sell VGA equipment and accessories that work in conjunction with the VGA Balun II. Company Website Products Altinex http://www.altinex.com/ VGA cables, Distribution Amps Black Box http://www.blackbox.com/ VGA cables, splitters Kramer Electronics http://www.kramerelectronics.com/ VGA Distribution Amps Startech http://www.startech.com/ VGA Splitter, Distribution Amps Extron http://www.
VGA Balun II Application Guide HD15 (VGA) Pin Configuration The following table provides the pin configuration of the HD15 (VGA) connector: Pin Name Dir 1 RED OUT 2 GREEN OUT 3 BLUE OUT 4 RES 5 GND -----6 RGND -----7 GGND -----8 BGND -----9 +5V OUT 10 SGND -----11 ID0 IN 12 SDA IN/OUT HSYNC or 13 OUT CSYNC 14 VSYNC OUT 15 SCL IN/OUT ©MuxLab 2006-2009 Description Red Video (75 ohm, 0.7 V p-p) Green Video (75 ohm, 0.7 V p-p) Blue Video (75 ohm, 0.
VGA Balun II Application Guide Conclusion The VGA Balun II is ideally suited for many applications. It is important to verify the type of equipment being used, the type of cable, and the distance required and the picture resolution needed before proceeding with an installation. If in doubt, please contact MuxLab Sales or Customer Technical Support for assistance at 877-689-5228 (North America) or e-mail us at videoease@muxlab.com. MuxLab Inc.
