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

UBS-Axcera 5000-Watt UHF Translator 315941

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Chapter 4

4-6 kW UHF Translator Chapter 4, Circuit Descriptions 837B, Rev. 0 4-1 Chapter 4 Circuit Descriptions 4.0 (A1) UHF Exciter Assembly (1278-1400; Appendix C) The (A1) UHF Exciter Assembly contains (A1) a UHF Exciter Tray (1142458 or 1245-1100), (A4 & A5) two Variable Gain/Phase Trays (1245-1200), (A6) a Metering Panel (1136811 or 1245-1400), (A7) a UHF Receiver Tray (1142479 or 1265-1100), (A8) an Exciter AC Distribution Assembly (1245-1500) and (A9) a Remote Interface Assembly (1245-1801). The (A7) UHF Receiver Tray, uses the ON Channel RF input, at J5 for 75 or J1 for 50, and produces a Combined IF output at J4 that connects to the UHF Exciter at J6. The (A1) UHF Exciter Tray, if the Optional Modulator Kit is present in the tray, takes the Baseband Audio and Video Inputs and mixes them with internally generated 45.75 MHz and 41.25 MHz Ifs that combines them. The Combined IF, from the Receiver Tray or from the Modulator Kit, is upconverted to the On Channel RF output frequency by mixing it with a L.O. signal generated by the Channel Oscillator Assembly. The RF Output of the UHF Exciter at J15 connects to (A3) a Splitter which splits the RF two ways with the RF Output #1 connected to the input of the (A5) Variable Gain/Phase Tray (1245-1200) and the RF Output #2 connected to the input of the (A4) Variable Gain/Phase Tray (1245-1200). The output of the (A4) Variable Gain/Phase Tray connects to (A2) the Side A Amplifier Array Assembly. The output of the (A5) Variable Gain/Phase Tray connects to (A3) the Side B Amplifier Array Assembly. 4.0.1 Control and Status The Control and Status of the Translator are provided by the Meter indications on the Metering Panel and the Variable Gain Phase Trays. There are also Control, Status and LED Indications located on the front panel of the UHF Exciter Tray. The switches and LED indicators, which are mounted so that the switches and LEDs are operated or viewed from the front Panel of the UHF Exciter, are part of the Transmitter Control Board (1245-1101). On the UHF Exciter Tray, switch (S1) is an Operate/Standby Switch that provides the Operate Commands (Enables), when in Operate, to each of the Amplifier Arrays. The power supply Enable is needed to turn on the Switching Power Supplies located in each of the UHF Amplifier Trays. The Fan Enable is needed to turn on the exhaust fan in the (Optional) External Exhaust Kit. When the UHF Exciter is in Operate, the Green LED (DS2) is On and when in Standby the Amber LED (DS1) is On. NOTE: If the Translator does not switch to Operate, when S1 is switched to Operate, check that a Dummy Jumper Plug is connected to Jack J7, with a Jumper between Pins 1 & 2, located on (A9) the Remote Interface Assembly in the Single UHF Exciter Assembly. The Jumper provides the Interlock to the UHF Exciter needed for the operation of the Translator. If the Interlock is present, the Green LED (DS5), located on the Transmitter Control Board, should be lit. Operation of the Translator is controlled by the front panel switches located on the UHF Exciter Tray. During Normal operation of the Translator, Switch S2 should be in the Auto position. The front panel of the UHF Exciter also has LEDs that indicate a Video Fault (Loss),
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Document ID315946
Application IDIvxsTSeCk+NqVRhS+T638w==
Document DescriptionChapter 4
Short Term ConfidentialNo
Permanent ConfidentialNo
SupercedeNo
Document TypeUser Manual
Display FormatMicrosoft Word - pdf
Filesize30.17kB (377151 bits)
Date Submitted2003-04-04 00:00:00
Date Available2003-06-17 00:00:00
Creation Date2003-04-04 13:04:08
Producing SoftwareAcrobat Distiller 5.0.5 (Windows)
Document Lastmod2003-04-04 13:04:08
Document TitleMicrosoft Word - 315946.DOC
Document CreatorPScript5.dll Version 5.2
Document Author: fcc
FCC ID Filing: OUS837B-5

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