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 2

10-kW UHF Transmitter with Chapter 2, System DescriptionFeedforward Driver840A, Rev. 0 2-1Chapter 2System DescriptionThe 840A (1064941) is a complete 10-kW UHF internally diplexed televisiontransmitter that operates at a nominalvisual output power of 10,000 watts peaksync visual and an average aural outputpower of 1000 watts with a 10 dBaural/visual ratio.2.1 System OverviewThe 840A is made up of three cabinetassemblies: the (A1) dual 250-wattdriver/amplifier assembly (1064946);(A2) the 10-kW amplifier assembly(1299-1100); and (A3) the high-voltagepower supply assembly, 208/240 VAC(1068022).2.1.1 (A1) Dual 250-WattExciter/Amplifier Assembly(1064946; Appendix A)The dual 250-watt driver/amplifierassembly is made up of the assembliesand trays shown in Table 2-1.Table 2-1. Driver/Amplifier Assembly Assemblies and TraysDESIGNATION NUMBER TRAY/ASSEMBLY NAME DRAWING NUMBERA2 AC distribution assembly 1265-1600A4 UHF exciter tray 1063301A9 3-watt amplifier tray 1068203A6 and A7 250-watt amplifier trays 1044027, low-band;1044028, mid-band;1044029, high-bandA14 Bandpass filter assembly --The exciter/amplifier assembly(1064946) is connected to the basebandvideo and aural inputs. The assemblyalso provides connections for the remotemonitoring and operation of theexciter/amplifier assembly. The UHFexciter tray (1063301) takes thebaseband aural and video inputs andproduces the visual and aural RF signalson the channel frequencies. Thecombined visual and aural RF output (+7dBm) of the exciter feeds the 3-wattamplifier tray (1068203). The 3-wattamplifier tray contains an automatic gaincontrol circuit and two 3-watt amplifierboards. The tray generates the outputlevel needed to drive the 250-wattamplifier trays (1044027, low-band;1044028, mid-band; and 1044029, high-band).The output from the 3-watt tray is fed tothe (A10) RF hybrid splitter SMAconnection J1. The RF hybrid splitteroutput feeds the RF signal to one of the250-watt amplifiers directly and, through(A5) the line stretcher, to the other 250-watt amplifier. The line stretcher givesthe operator the ability to control thephase of the output signal that is fed toone of the 250-watt trays. Each of the250-watt amplifier trays contains anamplifier enclosure and feedforwardcircuits to achieve an output of 250-wattspeak visual power and 25 watts of auralpower.In the 250-watt amplifier tray, a forwardpower sample from the UHF coupler isconnected to the dual peak detectorboard; this board provides a peak-detected forward sample to the amplifiercontrol board for metering purposes.Before exiting the 250-watt amplifiertray, the RF is fed through a circulator forthe protection of the tray from highVSWR conditions. The reject port of thecirculator is cabled to the reject
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Document ID112606
Application IDBGMB9M9jpEo5y9LJFhTJMw==
Document DescriptionChapter 2
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeUser Manual
Display FormatMicrosoft Word - pdf
Filesize9.87kB (123393 bits)
Date Submitted2000-08-09 00:00:00
Date Available2000-09-25 00:00:00
Creation Date2000-08-09 15:53:28
Producing SoftwareAcrobat Distiller 4.0 for Windows
Document Lastmod2000-08-09 15:53:30
Document TitleChapter 2
FCC ID Filing: OUS840A

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