Description, Rear Cover Assembly, Antennas

LBI-38432

∙Available Options - These options include the an- tennas, audio accessories, batteries, carrying acces- sories, chargers, lanyards, and the vehicular charger/repeaters.

DESCRIPTION

The MTL-SX portable radio is consists of a two primary assemblies. The Front Cover Assembly contains all of the microprocessor circuitry, audio circuitry and the operating controls. The Rear Cover Assembly houses the RF circuitry which includes the transmitter, receiver and the frequency synthesizer. The assemblies are electrically interconnected by two single-in-line type connectors. When mated together, the assemblies form a weather resistant die-cast aluminum case that protects the radio’s circuitry from harsh outside environments.

Power is provided by a battery pack that slides and locks on to the bottom of the radio. The radio’s on/off switch is located on the battery pack.

The antenna screws on to the top of the unit. A side antenna connection is also provided at the UDC for an external antenna or for test purposes. This UDC antenna connection is also utilized for external antenna operation when the radio is locked in the vehicular charger or repeater.

REAR COVER ASSEMBLY

The Rear Cover Assembly houses the RF Board in the die-cast aluminum case. The complete assembly consists of the VHF RF Board, aluminum case, top antenna jack, side (UDC) antenna jack and various hardware.

The RF Board’s circuitry includes the transmitter, re- ceiver and the frequency synthesizer. This FM circuitry is under complete control of the microprocessor circuits. Con- trolling data sent to this assembly from the Control Board includes serial synthesizer data loading, transmitter/receiver enabling and a transmitter power level signal. The RF Board outputs the demodulated audio and a synthesizer lock status line to the Control Board. During transmitter operation, the RF power appears at the top antenna jack (or the UDC jack if the appropriate adapter plug is inserted). The Rear Cover Assembly maintenance manual contains a detailed circuit analysis, mechanical, outline and schematic diagrams for this assembly.

FRONT COVER ASSEMBLY

The Front Cover Assembly houses all of the operating controls and the digital control circuitry for the radio. The Control Board is installed in the Front Cover Assembly and

flex circuits include the Keypad, UDC and Speaker Flex circuits. The speaker, microphone and Battery Plate are also a part of this assembly. The complete assembly is housed in the die-cast aluminum front cover.

The Control Board located in the Front Cover Assembly is the largest and most complex board in the Front Cover Assembly. It contains all microcomputer and audio circuitry which controls the radio. See the maintenance manuals spe- cific to the Control Board or the Front Cover Assembly for service information on the related assembly.

ANTENNAS

Antennas are selected base on the operating frequency range of the radio. Antenna option PANC1C, part number 19B234804P2, is a 146 - 162 MHz (red bands) antenna and antenna option PANC1D, part number 19B234804P3, is a 157 - 174 MHz (orange bands) antenna. Both of these anten- nas are helically-designed and mount in the antenna jack on the top of the radio. An external antenna can be mounted to the unit via the UDC. When an antenna is connected to the UDC, the antenna on the top of the radio is disabled.

BATTERY PACKS

The battery pack connects to the bottom of the unit and delivers a nominal 7.5 Volts dc to the radio. A recessed on/off switch for the radio is located on the battery pack. An internal fuse located in the radio’s Battery Plate protects the radio and battery from excessive current draw. The battery packs are available in several different capacities and sizes.

Radio contacts located on the top of the pack include switched power, ground, the speaker enabling contacts and a continuous power contact. In addition, four contacts are located on the rear of the battery pack. These four contacts provide connections to the slip-in type chargers or vehicular chargers/repeaters while the battery pack is still connected to the unit. The battery charging contacts are diode protected from external shorts.

The chargers utilize an internal thermistor in the battery pack to sense temperature and automatically control charge rate of the battery. This allows for a maximum charge rate without overheating the battery pack. All battery packs can be charged in less than 1 1/2 hours with the rapid type chargers. Nominal full charge time in a standard charger is 14 hours. The Service Section contains a detailed outline and schematic diagram of a typical battery pack. Further service information for the battery packs is also presented in the Service Section.

Chargers are available with nominal charge times of one hour (rapid) and fourteen hours (standard). Combinations include single (1) and multi (5 or 6) position standard and

MTL-SX specifications

The Ericsson MTL-SX is an innovative multi-technology radio system designed to support a variety of applications in the modern telecommunications landscape. As an integral part of Ericsson's portfolio, the MTL-SX brings together advanced features, high performance, and a suite of technologies that cater to both current and future demands of network operators.

One of the standout features of the MTL-SX is its support for multiple frequency bands. This flexibility allows operators to utilize existing infrastructure while efficiently transitioning to newer, more advanced technologies like 5G. The system is designed to operate seamlessly across various deployment scenarios, enhancing both coverage and capacity in urban and rural environments.

The MTL-SX is built on a software-defined radio architecture. This enables easy updates and enhancements, allowing telecom providers to adapt to changing market conditions without the need for extensive hardware upgrades. The ability to deploy new functionalities through software updates is a significant benefit that can reduce operational costs and improve service delivery.

Furthermore, the MTL-SX employs advanced antenna technology, including massive MIMO (Multiple Input Multiple Output), which increases spectral efficiency and elevates the quality of service. This feature is crucial for supporting high-data-rate applications and ensuring a reliable connection for users, particularly in densely populated areas where network congestion is a concern.

In terms of energy efficiency, the MTL-SX integrates intelligent power management features. These mechanisms optimize energy consumption based on real-time network demands, helping operators reduce operational expenses and minimize their carbon footprint. In an era where sustainability is a priority, the energy-efficient design of the MTL-SX aligns with global efforts to create greener telecommunications.

Complementing its hardware capabilities, the MTL-SX also supports advanced network management and orchestration tools. These tools provide operators with enhanced visibility into their networks, facilitating proactive maintenance and performance monitoring. By leveraging advanced analytics, operators can optimize their networks for better reliability and service quality.

Overall, the Ericsson MTL-SX stands out as a robust, flexible, and future-proof solution for network operators looking to enhance their service offerings in a competitive market. Its multi-technology capabilities, combined with software-defined architecture, energy efficiency, and advanced management tools, make it a key asset in the deployment of next-generation networks.