LBI-38652

LBI-38652

 

 

 

SPECIFICATIONS (Cont.)

Spurious Emissions

 

Radiated

Meets FCC requirements

Conducted

-57 dBm maximum

Rx Spurious Response

70 dB minimum

Adj Ch(2-Sig) Selectivity

-75 dB max @ 30 kHz (EIA)

Intermodulation Attenuation

-75 dB minimum

Rx Modulation Acceptance

± 7 kHz minimum

Audio Distortion

2% maximum @ 0.5 Watt (EIA)

 

10% maximum @ 4 Watts and 1 kHz

Audio Frequency Response

Within + 2,-8 of a 6dB/octave de-emphases,

 

300-3000 Hz (EIA)

Rx Hum and Noise

 

Unsquelched

-50 dB maximum

Squelched

-70 dB maximum

Audio Output Power

4 watts, @ <10% Distortion

Speaker Impedance

4 ohms

 

MDS RADIO PACKAGE NUMBERS

PACKAGE NUMBER

DESCRIPTION

TLH22

VHF 2 CHANNEL, 40 WATT

TLH28

VHF 8 CHANNEL, 40 WATT

 

OPTIONS

OPTION NUMBER

DESCRIPTION

MC3G

DESK TOP MIC

ANIR

1/4 WAVE, ROOF MT ANTENNA W/TNC CONNECTOR

ZM3L

EXTERNAL WEATHERPROOF SPEAKER AND CABLE

LS1F

MIL SPEC SPEAKER, 4 OHMS, 5 x 5

CD1E

SPEAKER CABLE

PD1A

NOISE FILTER KIT

SU1C

ALARM RELAY KIT

EC1A

DOC POWER SET

MA1L

DESK TOP RADIO MOUNTING WEDGE

PS1D

240 VAC-12 VDC, 13A 50/60 Hz Power Supply

PS5K

120 VAC-12 VDC, 13A 50/60 Hz Power Supply

INTRODUCTION

The Ericsson GE Conventional MDS VHF Radio is a rug- ged two-way FM mobile radio which operates in the 148-174 MHz frequency band. The MDS is a wide band synthesized ra- dio utilizing microcomputer technology to provide reliable high quality simplex two-way mobile communications. Its transmitter output power level is 40 watts over the wide band- width of each split. The receiver has an allowable 12 MHz maximum receive channel separation. There are two versions available, a 2-channel and an 8-channel. The basic radio pack- age includes the following features:

Microprocessor Control

Synthesized RF Channel selection (frequency control)

7-Segment LED Channel Display

Multi-tone Channel Guard (CTCSS) Encode/Decode

Multi-code Digital Channel Guard (DCG) Encode/Decode

Automatic Hook Switch Channel Guard Disable

Channel Activity Sensing (CAS)

Carrier Control Timer (CCT)

5 ppm frequency stability

Type 99 Tone Decode

Field Programmable with PC

Fixed Squelch, threshold programmable

Internal 4-watt Speaker, with volume control

Front Mounted Microphone Connector

Rear Mounted Antenna TNC Connector

Rear entry power connections

ANI Encode

The small size of the MDS radio makes it ideal for front mounting in conventional vehicles. The radio is operated with a simple hand held microphone in combination with the fol- lowing operating controls, all located on the front panel:

Power ON/OFF Switch

Channel UP/DOWN Selector

Volume UP/DOWN Control

Monitor Switch for Channel Guard Disable

Type 99 Tone RESET Switch, to reset the tone decoder.

Refer to the Operator’s Manual LBI-38651 for a complete description of the operating procedures.

RADIO DESCRIPTION

MAIN BOARD ASSEMBLY

A sturdy aluminum casting houses the Main Board Assem- bly N29/85154001920. There is complete accessibility to the Main Board with the radio’s top and bottom covers removed. The Main Board contains the following circuits:

Microprocessor and associated Logic

Frequency Synthesizer

Transmitter Exciter

Receiver

Audio Processing (for both transmit and receive paths)

Tone and Squelch Processing (for both transmit and receive paths)

Voltage Regulators

Logic Circuitry

The radio’s logic circuitry includes the 80C535 microproc- essor with associated EPROM and Electrically Erasable PROM (EEPROM) memory and latch circuitry. The Micro- processor controls the functions of the transmitter, the receiver, the inputs from the operator and the outputs to the operator.

Synthesizer

A programmable Synthesizer generates both transmit and receive operating frequencies. It includes a synthesizer chip, a dual modulas counter, a temperature compensated reference oscillator (TCXO) and a voltage controlled oscillator (VCO); all part of an operating phase lock loop, with its requisite loop filter.

Transmitter

The radio transmitter includes the Synthesizer’s modulated VCO and the fixed tuned exciter amplifiers. The exciter ampli- fiers are wideband, covering the VHF band without retuning. The exciter output is fed to the Power Amplifier Board through a coax cable. The exciter provides 35 dB of gain to drive the Power Amplifier with 2 watts. The transmitter output level at the antenna connector is factory set for a rated output power of 40 watts. The power control circuit detects the power output of the Power Amplifier. Using the error signal, the power control circuit varies the DC supply voltage to the first stage of the ex- citer. This will hold the transmitter output level constant.

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Ericsson LBI-38756 manual Introduction, Radio Description, MDS Radio Package Numbers, Options, Main Board Assembly

LBI-38756 specifications

Ericsson LBI-38756 is a pivotal document that outlines the specifications and features of various Ericsson products and technologies tailored for telecommunications solutions. This publication is an essential resource for network operators and telecommunications professionals seeking to leverage Ericsson's advanced technology offerings.

One of the primary highlights of LBI-38756 is its comprehensive overview of software and hardware integration, emphasizing how Ericsson's solutions can enhance network performance and reliability. The document details numerous features, including enhanced mobility management, advanced radio access technologies, and intelligent network management systems. These innovations allow network operators to improve user experiences by providing faster and more resilient communication services.

In terms of technologies, LBI-38756 includes detailed descriptions of Ericsson's Radio System, which supports a wide range of frequency bands and configuration options. This adaptability ensures optimal performance in diverse environments, enabling operators to efficiently meet the growing demand for mobile bandwidth and data services. The Radio System is complemented by Ericsson's Cloud Core technology, which offers a robust infrastructure for managing data traffic and supporting various applications, from voice calls to IoT devices.

Another significant characteristic of the Ericsson LBI-38756 is its emphasis on sustainability and energy efficiency. With the increasing focus on reducing the carbon footprint of telecommunications networks, Ericsson's solutions prioritize low-energy consumption while maintaining high performance levels. This commitment not only benefits the environment but also helps operators reduce operational costs.

Moreover, the document highlights Ericsson’s extensive portfolio of supporting software tools that enable network operators to optimize network planning and performance monitoring. These tools leverage advanced analytics and artificial intelligence to facilitate proactive decision-making, ensuring that networks are prepared to handle traffic fluctuations and future expansion.

In summary, the Ericsson LBI-38756 illustrates the company's dedication to delivering cutting-edge telecommunications technology. Its features encompass advanced radio systems, cloud capabilities, and sustainability initiatives, making it an invaluable resource for professionals aiming to adopt or enhance Ericsson's solutions in their telecommunications frameworks. As demand for reliable and efficient network services continues to grow, the insights offered in LBI-38756 will serve as a guiding framework for industry advancements.