UBS Axcera 837B-5 5000-Watt UHF Translator User Manual

UBS-Axcera 5000-Watt UHF Translator 315941

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837B-5 User Manual >

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Contents

Chapter 3

4-6 kW UHF Translator Chapter 3, Installation and Setup Procedures 837B, Rev. 0 3-1 Chapter 3 Installation and Setup Procedures There are special considerations that need to be taken into account before the 837B can be installed. For example, if the installation is completed during cool weather, a heat-related problem may not surface for many months, suddenly appearing during the heat of summer. This section provides planning information for the installation and set up of the translator. 3.1 Site Considerations The Translator consists of three cabinet assemblies, the Exciter Cabinet Assembly and two Amplifier Array Assemblies. The Exciter Cabinet Assembly requires an AC Input of 208/240 VAC, Single Phase with a rating of 20 Amps. Each of the Amplifier Array Assemblies requires an AC Input of 208/240 VAC, three Phase with a rating of 55 Amps or Single Phase with a rating of 100 Amps. Check that the site has the voltage requirement needed. The 837B is designed and built to provide long life with a minimum of maintenance. The environment in which it is placed is important and certain precautions must be taken. The three greatest dangers to the translator are heat, dirt, and moisture. Heat is usually the greatest problem, followed by dirt, and then moisture. Over-temperature can cause heat-related problems such as thermal runaway and component failure. Each amplifier tray in the translator contains a thermal interlock protection circuit that will shut down that tray until the temperature drops to an acceptable level. A suitable environment for the translator can enhance the overall performance and reliability of the translator and maximize revenues by minimizing downtime. A properly designed facility will have an adequate supply of cool, clean air, free of airborne particulates of any kind, and no excessive humidity. An ideal environment will require temperature in the range of 40° F to 70° F throughout the year, reasonably low humidity, and a dust-free room. It should be noted that this is rarely if ever attainable in the real world. However, the closer the environment is to this design, the greater the operating capacity of the translator. The fans and blowers designed and built into the translator will remove the heat from within the trays, but additional means are required for removing this heat from the building. To achieve this, a few issues need to be resolved. The first step is to determine the amount of heat to be removed from the translator room. There are generally three sources of heat that must be considered. The first and most obvious is the heat from the translator itself. The following example is for a 5000 Watt Transmitter. The heat can be determined by subtracting the average power to the antenna (3225 watts) from the AC input power (20,000 watts). This number in watts (16,775) is then multiplied by 3.41, which gives 57,202.75, the BTUs to be removed every hour. 12,000 BTUs per hour equals one ton; as a result, a 5-ton air conditioner will cool a 5-kW transmitter. The second source of heat is other equipment in the same room. This number is calculated in the same way as the equation for BTUs. The third source of heat is equally obvious but not as simple to calculate. This is the heat coming through the walls, roof, and windows on a hot summer day. Unless the underside is exposed, the floor is usually not a problem. Determining this number is usually best left up to a qualified HVAC technician. There are far too many variables to even estimate this number without reviewing the detailed drawings of the site that show all of the construction details. The sum of these

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Mirror Download [FCC.gov]
Document ID	315945
Application ID	IvxsTSeCk+NqVRhS+T638w==
Document Description	Chapter 3
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Microsoft Word - pdf
Filesize	68.77kB (859649 bits)
Date Submitted	2003-04-04 00:00:00
Date Available	2003-06-17 00:00:00
Creation Date	2003-04-04 13:03:32
Producing Software	Acrobat Distiller 5.0.5 (Windows)
Document Lastmod	2003-04-04 13:03:32
Document Title	Microsoft Word - 315945.DOC
Document Creator	PScript5.dll Version 5.2
Document Author:	fcc

FCC ID Filing: OUS837B-5

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