UBS Axcera 840A 10,000-watt UHF solid state television transmitter User Manual

UBS-Axcera 10,000-watt UHF solid state television transmitter Instruction manual for use of equipment

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Chapter 3

10-kW UHF Transmitter with                                               Chapter 3, Installation and                       Feedforward Drive                                                                  Setup Procedures840A, Rev. 0 3-1Chapter 3Installation and Setup ProceduresThere are special considerations thatneed to be taken into account before the840A can be installed. For example, if theinstallation is completed during coolweather, a heat-related problem may notsurface for many months, suddenlyappearing during the heat of summer.This section provides planninginformation for the installation and set upof the transmitter.3.1 Site ConsiderationsThe 840A transmitter requires two mainAC input lines, a 3-phase 208/240 VAC,60 Hz input of at least 100 amp ratingthat connects to the high-voltage powersupply assembly and a single-phase208/240 VAC, 60 Hz input of at least 40amp rating that connects to theexciter/driver assembly. Make sure thatthe proposed site has the necessaryvoltage requirements.The cabinets should be positioned withconsideration given for adequate airintake and exhaust. In addition,installation planning should take intoaccount the amount of space required forthe opening of the front of the meteringcontrol panel on the 10-kW amplifier; theopening of the rear doors on the 10-kWamplifier and exciter/driver cabinets;access to the trays, including slidingthem out for testing; the main AC hook-up to the high-voltage power supplyassembly; and the installation of theoutput transmission line, including thetrap filters and the directional coupler.The 10-kW amplifier cabinet contains atube cavity air exhaust stack that is a10.5-inch chimney mounted on the roofof the cabinet. Forced air flows thoughthis chimney from the blower assemblythat cools the tube mounted in the cavityassembly (1,100 CFM at 30° C rise).The 10-kW amplifier cabinet also has twoexhaust fans, rated at 240 CFM, mountedin the top cover assembly of the cabinet.Air intake for the tube cavity blowerassembly is through the large filtermounted on the bottom rear of thecabinet.The high-voltage power supply cabinethas two exhaust fans, each rated at 550CFM, mounted in the top cover assemblyof the cabinet. Air intake for the cabinetis through the two filters mounted oneach side of the cabinet.The 840A is designed and built to providelong life with a minimum of maintenance.The environment in which it is placed isimportant and certain precautions mustbe taken. The three greatest dangers tothe transmitter are heat, dirt, andmoisture. Heat is usually the greatestproblem, followed by dirt, and thenmoisture. Over-temperature can causeheat-related problems such as thermalrunaway and component failure. Eachamplifier tray in the transmitter containsa thermal interlock protection circuit thatwill shut down that tray until thetemperature drops to an acceptable level.A suitable environment for thetransmitter can enhance the overallperformance and reliability of thetransmitter and maximize revenues byminimizing down time. A properlydesigned facility will have an adequatesupply of cool, clean air, free of airborneparticulates of any kind, and noexcessive humidity. An ideal environmentwill require temperature in the range of40° F to 70° F throughout the year,reasonably low humidity, and a dust-freeroom. It should be noted that this israrely if ever attainable in the real world.However, the closer the environment isto this design, the greater the operatingcapacity of the transmitter.
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Document ID112607
Application IDBGMB9M9jpEo5y9LJFhTJMw==
Document DescriptionChapter 3
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeUser Manual
Display FormatMicrosoft Word - pdf
Filesize20.68kB (258561 bits)
Date Submitted2000-08-09 00:00:00
Date Available2000-09-25 00:00:00
Creation Date2000-08-09 15:55:21
Producing SoftwareAcrobat Distiller 4.0 for Windows
Document Lastmod2000-08-09 15:55:23
Document TitleChapter 3
FCC ID Filing: OUS840A

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