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Axcera 5720 Series Manual

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Summary of Contents for Axcera 5720 Series

  • Page 2: Table Of Contents

    Table of Contents INTRODUCTION SYSTEM Unpacking/Installation ................System Description ................Specifications ..................System Block Diagram and Interconnect ..........Front Panel ..................Rear Panel ..................OPERATION Initial Turn On ..................Status Screens ..................Setup Screens ..................MODULES Module Replacement How to replace a module ............... Backplane Board Description ..................

  • Page 3: Introduction

    INTRODUCTION The 5720 series product line is designed with the user in mind. With the implementation of modular component technology, it is no longer necessary to perform component level repairs at the site. By simply replacing an entire module the unit is quickly ready to return to normal operation.

  • Page 4: System

    Installation All 5720 series products are designed for simple installation with comprehensive instructions. Expensive test equipment is not required to keep a system operational, installation, and set up. Prior to installing the product review the check-...
  • Page 5 · Is the building structure where the equipment is to be placed properly prepared ? Listed below are systems and specifications that need to be opera- tional prior to installation of transmission equip- ment. Heating and Air Conditioning Electrical Systems Building Structure Antenna Satellite Dish...

  • Page 6: System Description

    System Description 5720 series transmitters are available in various power levels from 2.5 to 100 watts average power or 10 to 230 watts peak analog. Units can be factory set to a specific channel in the 2076-2700 MHz range. QAM signals up to M=256 as well as NTSC and PAL modulation can be processed by the unit.
  • Page 7 Digital / Analog 5720 MMDS Transmitter The new 5720 series transmitters are the result of a global design strategy. All aspects of the product design, from frequency range to modularity, reflect a long term commitment to our global partners. These transmitters...
  • Page 8 High Efficiency, Broadband Amplifiers Axcera has selected the newest, most efficient Anytime, Anywhere Communication and Backup GaAsFETs for the 5720 series. Redundant With the SCADA system operators have real time amplifier modules enable the system to stay on remote and local control of the transmitter the air in the event of a failure.

  • Page 9: Specifications

    5720 Series Specifications Subject to change without notice RF Performance 5721 5722 5723 5724 5725 5726 5727 RF Output Power (PEP Watts) RF Output Power Digital (Avg. Watts) 2.5 RF Output Power Analog (Pk Sync Watts with -15dB Aural) RF Output Frequency ........Any 6, 7, or 8 MHz channel, 2076-2700 MHz RF Output Impedance .........
  • Page 10 5725 100/25W peak/avg. transmitter 5040 VHF/UHF Receiver 5726 160/50 W peak/avg. transmitter 5727 280/100 W peak/avg. transmitter Axcera • 103 Freedom Drive • P.O. Box 525 • Lawrence, PA 15055-0525 USA • 724-873-8100 • FAX 724-873- 8105 info@axcera.com • www.axcera.com...

  • Page 15: Front Panel

    5720 Messages Message Description English Message Spanish Message Portguese Message software version 2.5 V2.5 V2.5 V2.5 Axcera, LLC Axcera, LLC Axcera, LLC Axcera, LLC Lawrence, PA, USA Lawrence, PA, USA Lawrence, PA, USA Lawrence, PA, USA (724) 873-8100 (724) 873-8100...
  • Page 16 output power OK OUTPUT POWER OK POTENCIA OK POT SAIDA OK output power fault OUTPUT POWER FAULT FALLA POTENCIA FALHA POT SAIDA PLL locked PLL LOCKED PLL CERRADO PLL ENGATADO PLL fault PLL FAULT FALLA PLL PLL COM FALHA external reference present EXT.REF.

  • Page 17: Rear Panel

    Rear Panel The rear panel of the 5720 features remote control inputs and outputs, visual and aural IF inputs and outputs, visual and aural analog inputs, 10MHz reference input, and access to SCADA communications if that is a selected option. AC connections as well as a cooling fan and circuit breaker are also located on the back of the unit as pictured below.
  • Page 18 Connections for an External Amplifier (from amplifier) (to transmitter) Description J3 D Connector J12-D Connector Remote forward power J3-4 J12-35 Remote reflected power J3-6 J12-37 Operate J3-8 J12-13 Ground (typical) J3-5 J12-36 Amplifier interlock return J3-9 J12-18 Amplifier interlock for ABS (if J3-10 used) J3-16...
  • Page 19 Rear Panel Loop Thrus Two rear panel loop thrus are located on the back of the transmitter. The Visual IF O/P J4 is connected to the Visual IF Input J5, and the Aural IF Input J7 is connected to the Aural IF input J6 if no scrambling or encoding is used. Connections For Scientific Atlanta Scrambling 1.
  • Page 21 Notice the top line is Peak-of-Sync and two centimeters down from the top line is Blanking. Also, one centimeter up from the bottom line is “White”. These three points will be referred to later in this procedure. To obtain this pattern it is necessary to first setup the Pac-Mono equipment per their procedure. Connect the “five step”...

  • Page 22: Operation

    Turn on the main AC power source that supplies the entire system. Turn on the AC circuit breaker (CB1) on the back of each unit. Verify that each unit is showing the display as indicated AXCERA V 2.5 in the diagram. (Note: Some models may display ADC TELECOMMUNICATIONS).

  • Page 23: Status Screens

    Status Screens Normal Operation Fault Condition (flashing) TRANSMITTER STATUS TRANSMITTER STATUS IF INPUT FAULT IF PRESENT PRV NXT PRV NXT Additional messages are as follows: IF PRESENT IF INPUT FAULT OUTPUT POWER OK OUTPUT POWER FAULT PLL LOCKED PLL FAULT EXT REF PRESENT EXT REF FAULT AMP MODULE OK...

  • Page 24: Setup Screens

    Accessing the setup screens is accomplished by holding IF INPUT FAULT down the second button for five seconds. MODEL SETUP The 5720 series transmitter provides the user with MODEL :5722 various setup options. First select the appropriate model. (5722, 5723, 5724, 5725, 5726, 5727)

  • Page 25: Modules

    MODULES Module Replacement Module replacement on 5720 series products is a relatively simple process. All modules plug directly into the backplane board except the power supply and power amplifier module which plug into a blind mating connector. A detailed description of how to replace each module is addressed in the section to follow.

  • Page 26: Backplane Board

    Backplane Board The backplane assembly provides module to module connection with devices being directly plugged in. Connections on the backplane also interface with other devices to establish remote control and command functions. The schematic on the next page shows connections from the backplane board the rest of the backplane system.

  • Page 28: Modulator Module (Optional)

    Modulator Module The modulator can be used with an external 4.5MHz aural input instead of the normal bal anced and composite inputs. The 4.5 MHz is applied to the transmitter using the composite audio input connector. There are three jumpers on the modulator module that will need to be moved to convert to this input.
  • Page 29 Dip Switch Settings The switch settings on the modulator board for an NTSC system are as follows: Visual Carrier Channel Freq SW2 SW9 SW10 SW12 SW8 SW6 SW7 45.75 1100 0111 0001 0001 0111 1111 1000 45.75 +10KHz CF -10KHz 1100 0111 0001 0001 1111 0000 0000 45.75 -10KHz CF +10KHz...
  • Page 30 Jumpers Audio Jumpers for Modulator Module Preemphasis enable Floating / Grounded compos- ite (gnd enabled) 4.5 MHz subcarrier int/ext (internal enabled) Ext 4.5 MHz subcarrier en- abled...
  • Page 31 Video Jumpers Group delay enable Video loss fault enable...

  • Page 32: Power Supply Module

    Power Supply Module The power supply module contains a 530 watt switching power supply and an eight position terminal block. It is configured for three output voltages +12V, -12V, and a main output power of 10.8V. The supply is power factor corrected to .98 for optimum efficiency and decrease in energy consumption.
  • Page 33 Back view of the Power Supply Module...

  • Page 34: Power Amplifier Module

    Power Amplifier Module The power amplifier module has a female SMA RF input connector on the front of the mod ule. The RF I/P signal applied to this connector is amplified and transmitted from the back of the module through a female N connector. There are several power configurations avail able with or without feed forward linearization.
  • Page 35 Transmitter Output Power Amplifier Module Bias Protection Model Rating Style Board 5721 2.5W QAM 10W Analog 1 Section Bias Protection Board 20W PEP 5722 5W QAM 20W Analog 3 Section Bias Protection Board 40W PEP 5723 10W QAM 30W Analog Feed Forward 3 Section Bias Protection Board 50W PEP...
  • Page 36 Bias Protection Board The RF power transistors contained in the amplifier module are supplied current and voltage through the bias protection board. The number of transistors contained in the amplifier module determines the size of the Bias Protection Boards as listed in the previous table. Logic circuitry on this board protects the transistors by shutting off power to the module in the event that the gate bias voltage is lost.
  • Page 37 Test Points Description FWD DET LEV T/P Forward Power Detection Level Test Point provides a DC voltage that is pro- portional to the forward output power of the transmitter. (1V=100%) REFL DET LEV T/P Reflected Power Detection Level Point provides a DC voltage that is propor- tional to the reflected output power of the transmitter.

  • Page 38: Lo/Upconverter Module

    LO / Upconverter Module LO Sample - SMA connector RF Output - SMA connector Sample - SMA connector...
  • Page 39 This module consists of the A1, LO/ Upconverter board, a channel filter, and an output amplifier board. This module takes an external IF and converts it to the final RF output frequency using an internally generated local oscillator. The local oscillator consists of a VCO that is phase locked to an external 10 MHz reference. The 10 MHz reference and the VCO are both divided down to 500kHz and compared by the phase lock loop.

  • Page 40: If Processor Module

    IF Processor Module The IF Processing module provides frequency response, group delay, and linearity equal ization for the transmission system. This module also monitors and controls the level of output power generated by the power amplifier. I/P - red LED indicates an input fault P/A - red LED indicates a PA fault (peak to ave) ALC - red LED indicates an ALC fault MUTE - red LED indicates loss of video...
  • Page 41 The circuitry of the IF Processor Module goes through the following stages as described in the text that follows. Impedance Matching and Gain Selection Circuitry The IF input signal is applied from the backplane connection to J1-32B, the DIN connector located at the back of the module.
  • Page 42 Input Signal Detection Circuitry A sample of the IF input signal that is taken through a directional coupler after passing through the impedance matching and gain circuitry, is applied to an envelope detector. The average and peak amplitudes of the envelope are measured and sent to a set of comparator circuits.
  • Page 43 Automatic Level Control Circuitry A voltage controlled attenuator placed after the frequency response equalization circuit allows dynamic adjustment of the IF signal gain and provides a means of controlling the level of output power generated by the power amplification stages of the system. Mode Operation Manual - the attenuator gain is controlled manually by...
  • Page 44 Group Delay Equalization Circuitry A set group of delay equalizer circuits can be inserted into the signal path after the ALC attenuator circuit. These have been designed for improved group delay performance for certain filtering and channel combining schemes. A description of these circuits are given below.
  • Page 45 Linearity Equalization Circuitry After the filtering circuitry a linearity equalization circuit can be placed in the signal path to compensate for nonlinear distortions that may appear at a later stage in the transmission system. These distortions are the result of gain compression in high power amplifier stages. The linearity equalization circuit will offset gain compression by increasing signal gain through the module as the signal increases in power.

  • Page 46: Description

    IF Processing Module Controls LED Indicators Description I/P Fault Illuminates when there is a loss of IF input signal P/A Fault Illuminates when the peak to average power ratio of the IF input signal exceeds the safety threshold. ALC Mute Illuminates when the required gain has exceeded the operation range of the ALC circuit Mute Illuminates when the IF input signal is muted by the IF processing module...

  • Page 47: Control And Monitoring Module

    Control and Monitoring Module The control and monitoring module interfaces with all other modules. Refer to the tables on the following pages for specific details about the functions of this module. ACTV - green LED that is dim during microprocessor boot up and bright when active.

  • Page 48: Description

    IF Processor Module Interface Signal Name Backplane Backplane Signal Type Description IF Processor Pin Outer loop Mon J19-11A J20-26C Analog Input 0-1.25V Indicates the output power of an external amplifier. The scale factor of this input is 100% / V Forward Power J19-13A J20-23C...

  • Page 49: Description

    Modulator Module Interface Signal Name Backplane Backplane Signal Type Description Modulator Pin Modulator Interlock J19-27B J18-1C Discrete Contact Provides a pull down to indicate that the Closure Input modulator module is installed. A low level indicates the module is installed Unlock Mute J19-28B J18-1B...
  • Page 50 Front Panel Interface Signal Name Backplane Backplane Signal Type Description Front Panel Pin Fault Anode J19-1C J22-26 Drive voltage to Voltage is derived from the +5 supply which is the fault LED passed through a resistor to supply the anode of the fault LED Fault Cathode J19-2C...
  • Page 51 Control and Remote Interface Signal Name Backplane Backplane Signal Type Description Control/Remote Pin Standby CMD (FA) J19-29C J12-1 Discrete open collector input Low indicates FA requests the xmrt go to standby Operate CMD (FA) J19-30C J12-3 Discrete open collector input Low indicates FA requests the xmrt go to operate Aural / Visual Mute (FA) J19-31C...
  • Page 52 Frequency Generator /Upconverter Module Interface Signal Name Backplane Backplane Signal Type Description U/C Pin External Ref Indicator J19-4A J21-26C Discrete Open Collector Input High indicates prescence of a 10MHz reference Logic Enable J19-5A J21-25C Discrete CMOS Output Provides a load enable signal to PLL in the freq synthesizer chip.
  • Page 53 LCD Display Connections The LCD display assembly is located on the front panel behind the display. It interfaces with other devices through a ribbon cable. Pin Number on J2 Position Number on J1 Function 16 Pos female connector 26 Pos male connector on the LCD Module on backplane ribbon cable J2-16...

  • Page 54: Index/Appendix

    INDEX/APPENDIX Typical Transmitter Site Typical 5720 transmitter site 2.5-2.7 GHz Analog Transmit Satellite Antenna Transmission Receive Antenna / Video Video Visual & & & Audio Audio Aural 5720 Transmitter Analog Scrambling / with Modulator Satellite IRD Encryption Video & Audio...

  • Page 55: Troubleshooting

    Troubleshooting Typical troubleshooting of the 5700 series entails module replecement, however some circumstances may require adjustments to the unit. Refer to the charts that follow for troubleshooting guidance.

  • Page 60: Material Return Procedure/Exchanges

    Material Return Procedure/Exchanges In order to efficiently handle equipment or components returned for repair or sent out on loan, Axcera requests that each returned item be accompanied by a Return Material Authorization Number (RMA#). To obtain an RMA# follow the procedures below:...

  • Page 61: Proper Packing Of Materials

    Proper Packing Of Materials When returning materials to Axcera, it is extremely important to pack them prop- erly. Due to the delicate nature of components contained within the equipment, major damage can occur without proper packing. Please adhere to the following guidelines when returning materials.
  • Page 62 LIMITED WARRANTY ONE YEAR Seller warrants each new product manufactured and sold by Seller against defects in material and workmanship under normal use and service, for a period of one (1) year from the date of shipment from Seller’s plant, when operated in accordance with Seller’s operating instructions. This warranty shall not apply to tubes, fuses, batteries, or bulbs.
  • Page 63 WARNING!!! DO NOT ATTEMPT TO REPAIR OR TROUBLESHOOT THIS EQUIPMENT UNLESS YOU ARE FAMIL- IAR WITH ITS OPERATION AND EXPERIENCED IN SERVICING HIGH VOLTAGE EQUIPMENT. LE- THAL VOLTAGES ARE PRESENT WHEN POWER IS APPLIED TO THIS SYSTEM. IF POSSIBLE, TURN OFF POWER BEFORE MAKING ADJUSTMENTS TO THE SYSTEM. EMERGENCY FIRST AID INSTRUCTIONS Personnel engaged in the installation, operation, or maintenance of this equipment are urged to become familiar with the following rules both in theory and practice.

  • Page 64: Abbreviations And Acronyms

    ABBREVIATIONS/ACRONYMS Analog to digital Radio Frequency Alternating Current Surface Acoustic Wave Automatic Frequency Control Signal to Noise Ratio Automatic Level Control Upper sideband Amplitude modulation VCXO Voltage Controlled Crystal Oscillator Automatic Gain Control Vestigial Sideband American wire gauge VSWR Voltage Standing-wave Ratio Bit Error Rate Bandwidth Direct Current...
  • Page 65 Index Material Return Procedure/Exchanges 56 ABBREVIATIONS/ACRONYMS 60 Modulator Module 24 Audio Jumpers 26 Modulator Module Interface 45 Automatic Level Control Circuitry 39 Module Replacement 21 Backplane Board 22 Normal Operation 18 Backplane Board Connections 23 Band Pass Filtering 40 Bias Protection Board 32 Output Signal Detection Circuitry 38 Control and Monitoring Module 43 Control and Remote Interface 47...

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