ATLAS® 4500 Multimode Station Technical Manual .
Copyright © 2016-2021 by EF Johnson Technologies, Inc. The EFJohnson Technologies logo and StarGate are trademarks of EF Johnson Technologies, Inc. ATLAS is a registered trademark of EFJohnson Technologies. All other company and/or product names used in this manual are trademarks and/or registered trademarks of their respective manufacturers. Information in this manual is subject to change without notice.
ATLAS 4500 Multimode Station Technical Manual July 2021 Section 1 - Introduction 1-1 Using This Manual ............................................................................................................................. 1-1 Audience .................................................................................................................................... 1-1 Manual Organization ..............................................................................................................
Table of Contents (continued) Rack Installation ................................................................................................................................ 3-1 Connections ....................................................................................................................................... 3-1 Initial Configuration ...........................................................................................................................
Table of Contents (continued) Front End ......................................................................................................................... A-8 90 MHz IF Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8 Receiver DC Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8 380-520 MHz Power Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents (continued) iv ATLAS 4500 Multimode Station Technical Manual July 2021
List of Figures Figure 2.1 2.2 2.3 2.4 Page ATLAS 4500 Introductory View........................................................................................ 2-2 Block Diagram ................................................................................................................. 2-3 Front Panel ...................................................................................................................... 2-4 Rear Panel and Connectors ...................................................
List of Figures (continued) Figure vi Page ATLAS 4500 Multimode Station Technical Manual July 2021
List of Tables Table 1.1 2.1 2.2 2.3 2.4 2.5 2.6 6.1 Page ATLAS 4500 Antennas / Antennes .................................................................................. 1-5 Front Panel LEDs ............................................................................................................ 2-4 Rear Panel Connectors ................................................................................................... 2-6 General Specifications.......................................................
List of Tables (continued) Table viii Page ATLAS 4500 Multimode Station Technical Manual July 2021
S ECTION Introduction This section contains information on the following topics: • Using This Manual • Safety Information • Regulatory Information 1.1 Using This Manual This manual is the core document for information on ATLAS® 4500 Multimode Station installation, new configuration, administration, and maintenance. 1.1.1 Audience This manual is intended for technical support personnel, system and network administrators, who install, configure, and maintain the ATLAS 4500. 1.1.
Safety Information Section 1 - Introduction • Technical Support and Service 1.2 Safety Information 1.2.1 Safety Precautions These safety precautions, warnings and cautions advise personnel of specific hazards that may be encountered during the procedures contained in this document. Control measures are required to prevent injury to personnel, and damage to equipment and the operating environment.
Regulatory Information Section 1 - Introduction 1.2.3 Warnings and Cautions Observe all warnings and cautions when working on or around this equipment. ! WARNING ! CAUTION 1.3 • Radio frequency radiation. A radio frequency (rf) radiation hazard exists in this equipment. To avoid rf injury, do not touch the antenna when the transmitter is in use. Do not operate transmitter with antenna disconnected. • Thermal or RF burns. Do not attempt internal servicing while transmitting.
Regulatory Information Section 1 - Introduction 1.3.2 FCC Part 15.21 Warning Statement The grantee is not responsible for any changes or modifications not expressly approved by the party responsible for compliance. Such modifications could void the user’s authority to operate the equipment. 1.3.3 FCC Part 15.105(b) Warning Statement This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
Regulatory Information Section 1 - Introduction 1.3.5 IC RSS-GEN, Sec 8.3 Warning Statement English The ATLAS 4500 has been approved by Industry Canada to operate with the antenna types listed in Table 1.1 with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
Regulatory Information Section 1 - Introduction • Do not operate the repeater without the proper antenna installed. • Do not allow children to operate transmitter equipped repeater equipment. NOTE The preceding warning list is not intended to include all hazards that may be encountered when using this repeater. Français ! CAUTION Ce répéteur émet des fréquences radio (RF) lors de la transmission.
S ECTION Product Overview This chapter contains the following sections: • Functional Description • Hardware Description • Software Description • Specifications 2.1 Functional Description The ATLAS 4500 (Figure 2.1) is a fully software-definable IP-based linear base station that operates in P25 Phase 1 and P25 Phase 2. It has both analog and P25 mixed-mode capabilities. It is available in a range of frequency bands including VHF, UHF, and 700/800 MHz.
Functional Description Section 2 - Product Overview Figure 2.1 2.1.1 ATLAS 4500 Introductory View Architecture • Leverages a common hardware platform to support the following: - 12.5 kHz, 20 kHz, and 25 kHz Analog - 12.5kHz FDMA P25 Phase I - 6.
Hardware Description Section 2 - Product Overview • High-power ultra linear ultra compact RF power amplifier uses digital and RF techniques and components that greatly simplify operation • Full-spectrum coverage in VHF, UHF, and 700/800 MHz 2.2 Hardware Description This section contains information on the following topics: • Block Diagram • Front Panel Indicator LEDs • Rear Panel Connectors 2.2.1 Block Diagram The block diagram in Figure 2.
Hardware Description Section 2 - Product Overview 2.2.2 Front Panel Indicator LEDs Figure 2.3 shows the ATLAS 4500 front panel. Table 2.1 contains descriptions of the front panel indicator LEDs. Front Panel Figure 2.3 ANALOG POWER P25 PHASE 1 P25 PHASE 2 Rx A Tx A Rx B Tx B LINK Table 2.
Hardware Description Section 2 - Product Overview 2.2.3 Rear Panel Connectors Figure 2.4 shows the ATLAS 4500 rear panel and its connectors. Table 2.2 contains descriptions of the connectors. Figure 2.
Software Description Table 2.2 Section 2 - Product Overview Rear Panel Connectors Connector Type Function Primary Audio RJ 45 socket, 8 pin Primary 4-Wire/4-Wire E&M Connection. Used to transmit over 4-wire or receive over 4-Wire from the receiver Secondary Audio RJ 45 socket, 8 pin Not used (Secondary 4-Wire/4-Wire E&M Connection. Designed to receive audio over 4-wire from optional Receiver 2.
Specifications Table 2.3 Section 2 - Product Overview General Specifications Parameter Values Mounting 19” rack or shelf Dimensions (Height x Width x Depth) 3.5" x 19" x 17.9" (89 x 483 x 455mm) Weight 24.25 pounds (11 kg) Operating Temperature Range -22°F to +140°F (-30°C to +60°C) Power Requirements AC: 90-264 VAC, 47-63 Hz or DC: 24-58 VDC positive or negativeground Power Consumption 100 W Tx 430 W Rx 28 W RF Interconnects Tx: N Female Rx: N Female Channel Spacing 12.
Specifications Table 2.4 Section 2 - Product Overview Transmitter Specifications (continued) Parameter VHF UHF 700 / 800 MHz Analog FM Hum & Noise (S/N Ratio) 45 dB Maximum Deviation (Analog) ± 2.5 kHz ± 2.5 kHz ± 5 kHz Maximum Deviation (Digital) ± 3110 Hz ± 3110 Hz ± 3110 Hz Table 2.
S ECTION Installation and Configuration This chapter contains the following sections: • Rack Installation • Connections • Initial Configuration 3.1 Rack Installation EFJohnson performs all rack installation before delivering the ATLAS 4500 to the customer. Refer to Section 6 for information on obtaining technical support and service. 3.2 Connections EFJohnson makes all ATLAS 4500 cable connections for the customer. Refer to Section 6 for information on obtaining technical support and service. 3.
Initial Configuration Section 3 - Installation and Configuration Administrators use the ATLAS 6100/6200 Network Management System (NMS) to configure and maintain the ATLAS 4500. Refer to the ATLAS 6100/6200 Network Management System (NMS) Technical Manual.
S ECTION Alignment The ATLAS 4500 does not require alignment. Refer to Section 6 for information on obtaining technical support and service.
Section 4 - Alignment 4-2 ATLAS 4500 Multimode Station Technical Manual July 2021
S ECTION Maintenance The ATLAS 4500 contains no parts that the customer may maintain. Refer to Section 6 for information on obtaining technical support and service. 5.1 Software Updates Administrators use the ATLAS 6100/6200 Network Management System (NMS) to perform software updates for the ATLAS 4500. Refer to the ATLAS 6100/6200 Network Management System (NMS) Technical Manual.
Software Updates 5-2 Section 5 - Maintenance ATLAS 4500 Multimode Station Technical Manual July 2021
S ECTION Technical Support and Service EFJohnson technical personnel are available to provide both onsite and online service, in accordance with the existing support agreement. 6.1 Contacting EFJohnson If EFJohnson Technologies technical personnel are not on site, and are needed for installation assistance, contact the EFJohnson Technologies representative for your site. Check with your site engineer or site manager for contact information. 6.1.
Product Warranty and Repair Section 6 - Technical Support and Service Table 6.1 Customer Service Contact Information Method (800) 328-3911 (all except Multi-Net) Extensions: Toll-Free Phone: • • • • Option #1: Orders and Parts Option #3: Technical Support Option #4: Repair Depot Option #5: Warranty, Support, Questions (800) 295-1773 (Multi-Net only) NOTE Fax: (972) 819-0851 Email: techsupport@efji.
Returns for Repairs Section 6 - Technical Support and Service 6.2.1 Online Product Registration EFJohnson offers greater convenience through online product warranty registration. Registering EFJohnson products online allows customers to receive warranty service and field service notices more quickly. To register EFJohnson Technologies products online and ensure the covered warranty: Step 1 In your browser, go to http://www.efjohnson.com/. Step 2 Click the Service & Support link. 6.
Internet Home Page 6.5 Section 6 - Technical Support and Service Internet Home Page EFJohnson Technologies has an Internet site that can be accessed for information on the company about such things as products, systems, and regulations. The address is http://www.efjohnson.
Appendix UHF Circuit Descriptions This chapter contains descriptions of the following UHF ATLAS 4500 internal components. For each of the following components, this chapter contains a general description and a schematic description: • • • • • • 380-520 MHz Exciter Module 380-520 MHz Receiver Module 380-520 MHz Power Amplifier Controller Board Audio Logic Board Power Supply A.
380-520 MHz Exciter Module Appendix A - UHF Circuit Descriptions A.1.1 General Description The Exciter module generates the low level RF transmitter signal that is amplified to nominal output power level by the Power Amplifier. The exciter module consists of two circuit boards. A Voltage Controlled Oscillator (VCO) board and an RF board with associated frequency synthesizers, a modulation controller, filtering circuits and internal power supply circuits.
380-520 MHz Exciter Module Appendix A - UHF Circuit Descriptions Synthesizer IC24 and associated components provide a reference of 120.45 MHz for the error loop second mixer LO amp IC21. This 120.45 MHz signal is frequency locked to the 10 MHz main reference clock. Synthesizer IC22 and associated components provide a reference of 40.32 MHz for the MCLK line to the A/D IC 31. This 40.32 MHz signal is frequency locked to the 43.2 MHz FPGA ADLMX line. A.1.2.
0-520 MHz Exciter Module Appendix A - UHF Circuit Descriptions A.1.2.4 RF Carrier Generation & Modulation RF carrier modulation type Phase 1 FM or LSM and Phase 2 H-DQPSK is generated within IC31 FPGA and IC32 DDS from a serial digital stream on the I2S bus lines coming from the external digital signal processor (DSP) and fed into Pins 5, 7 and 8 of CN3. The initial setup for the FPGA internal Arm controller is done through the I2C bus on Pins 9 and 12 of CN3.
380-520 MHz Exciter Module Appendix A - UHF Circuit Descriptions The feedback signal from the Power Amplifier sample port comes into the exciter module through CN6 at approximately 3 dBm. This is attenuated then downconverted with the main VCO output (499.64—639.64 MHz) from buffer amp IC16 by mixer M1 to provide an output of 119.64 MHz. This passes through a 150 MHz low pass filter and is amplified by IC15. The 119.64 MHz IF is down-converted with the 120.
380-520 MHz Receiver Module Appendix A - UHF Circuit Descriptions IC9 is configured as a boost DC-DC converter and provides +25 V DC output for the main PLL. IC3 is a linear regulator regulating the +5.2 V supply down to +5 VDC for linear circuits, A/D, RF amps etc. IC30 and IC48 are linear regulators regulating the +5 V supply down to +3.3 V DC for the synthesizers. IC33 contains multi-circuit buck DC-DC converters and low drop out regulators that provide +3.3 V, +2.5 V, +1.8 V and +1.
380-520 MHz Receiver Module Appendix A - UHF Circuit Descriptions A.2.2 Schematic Description A.2.2.1 Frequency Synthesizer RF is output from the VCO board on SKU2-1. It gets applied to the fractional-N synthesizer IC6 main divider input. This signal is compared with the reference oscillator frequency and the correction voltage from the synthesizer’s charge pump output, which is filtered then amplified by the non-inverting low noise Op Amp IC10.
380-520 MHz Receiver Module Appendix A - UHF Circuit Descriptions A.2.2.3 Reference Clock A stable 10 MHz reference is generated by X1—a temperature controlled crystal oscillator (TCXO), and fed to the synthesizer IC6 through an amplifier consisting of TR2 and associated components. A.2.2.4 Front End The incoming signal from the antenna is connected to CN1, where it passes through a low pass filter, then a limiter before amplification by IC2 (which can be linked out for higher dynamic range).
380-520 MHz Power Amplifier Appendix A - UHF Circuit Descriptions IC48 regulates +5 V supply down to +3.3 VDC. A.3 380-520 MHz Power Amplifier This section contains information on the following Power Amplifier components: • • • • • • • • Attenuator Driver Module Output Power Amp Power Coupler Power Detector Harmonic Filter PTT Power Control Auxiliary Circuits A.3.
380-520 MHz Power Amplifier Appendix A - UHF Circuit Descriptions bandwidth. Prior to transmission, the PA O/P first feeds an RF coupler providing ~ 4 dBm O/P for a 100W output. This port is used for the DPD loopback, feeding the loopback I/P of the Exciter. It then passes through a low loss element elliptical low pass filter, which filters out the unwanted harmonics.
380-520 MHz Power Amplifier Appendix A - UHF Circuit Descriptions This module is a high linearity low intermodulation 75-Ω power driver with approximately24 dB gain, 28 dBm RF power. It operates at 24 V at 450 ma. A.3.2.4 Output Power Amp The PA output power amp stage uses a high performance power FET in a Gemini package. This is mounted on a copper heat spreader plate, on a fan-cooled aluminium heat sink.
Controller Board Appendix A - UHF Circuit Descriptions A.3.2.6 Power Detector Next, the output RF passes a directional coupler. This is used to sense PA forward and reflected power. The FWD VOLTS goes to CN – 11. REFL VOLTS goes to CN – 12. Detector sensitivity gives approximately 3.5 V at 100 W at the center of the band. NOTE A harmonic filter network is added to keep response flat. A.3.2.7 Harmonic Filter Next follows a 4-stage elliptical low pass filter inside a screened cover.
Controller Board Appendix A - UHF Circuit Descriptions A.4.1 General Description The Controller PCB contains the following: • • • • • • • • • • • • • • The main microcontroller IC1 containing CPU, flash, RAM, UARTs, ports etc Data latches Serial Flash 3.
Controller Board Appendix A - UHF Circuit Descriptions • I2C bus for exciter serial flash and FPGA ARM communication from the Controller • TXVCO volts monitor line. Exciter PTT line from the Controller, • The main data stream using 3 x I2S data communication lines from DSP, 2 Serial data lines from the Controller board for diagnostic use. • 1 pps line to FPGA for similcast. • FPGA PTT, FPGA TP G line, FPGA TP H line (initially used).
Controller Board Appendix A - UHF Circuit Descriptions A.4.2.5 Fan Control The PA fan interface has 4 pins. 12 V Power is switched with a pulse width FET. Fan power noise spikes are attenuated by RFI network using L1 etc to eliminate noise on 12 V power. A speed control is provided for the fan. A pulse RPM sensor allows RPM to be measured. A.4.2.
Audio Logic Board Appendix A - UHF Circuit Descriptions • Gateway operational software to obey command protocol from the DSP. DSP sends commands to set up RF characteristics, modulation etc. • PA power control software and temperature sensing. Fan control. • Debug software to allow control through the PC terminal program.
Power Supply Appendix A - UHF Circuit Descriptions A.6 Power Supply This section contains information on the following Power Supply components: • Mains-to-48V PSU • Filters • Switch Mode DC-to-DC Convertors A.6.1 General Description The base station main power supply contains the following: • • • • • • • 100 – 240 VAC-to-48 VDC supply Mains Filter, 48 V I/P and 3 O/P Filters. DC to DC 5.2 V PSU DC to DC 13.8 V PSU DC to DC 24 V PSU Cable and connector to main Controller PCB and PA. Shielded case A.6.
Power Supply Appendix A - UHF Circuit Descriptions Each supply capacity is approximately 1.5 A and is fold-back protected.
Power Supply A-18 Appendix A - UHF Circuit Descriptions ATLAS 4500 Multimode Station Technical Manual July 2021