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LBI-38435B
Maintenance Manual
MLS
29.7-42 MHz, 42-50 MHz
60 WATTS
TWO-WAY FM MOBILE RADIO
COMBINATION
INCLUDES
TRANSMITTER/RECEIVER ..................................................LBI-38436
SYSTEM CONTROL/SYNTHESIZER....................................LBI-38437
FRONT PANEL/CONTROL UNIT ..........................................LBI-38424
SERVICE SECTION ..............................................................LBI-38438
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Table of Contents
Related Manuals for Comnet LBI-38435B
Summary of Contents for Comnet LBI-38435B
- Page 1 LBI-38435B Maintenance Manual 29.7-42 MHz, 42-50 MHz 60 WATTS TWO-WAY FM MOBILE RADIO COMBINATION INCLUDES TRANSMITTER/RECEIVER ..........LBI-38436 SYSTEM CONTROL/SYNTHESIZER........LBI-38437 FRONT PANEL/CONTROL UNIT ..........LBI-38424 SERVICE SECTION ..............LBI-38438...
- Page 2 LBI-38435B NOTICE! The software contained in this device is copyrighted by Com-Net Ericsson Critical Radio Systems, Inc. Unpublished rights are reserved under the copyright laws of the United States. This manual is published by Com-Net Ericsson Critical Radio Systems, Inc., without any warranty. Improvements and changes to this manual necessitated by typographical errors, inaccuracies of current information, or improvements to programs and/or equipment, may be made by Com-Net Ericsson Critical Radio Systems, Inc., at any time and without...
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Page 3: Table Of Contents
LBI-38435B TABLE OF CONTENTS SPECIFICATIONS..............................4 DESCRIPTION................................6 OPERATION ................................8 CONTROLS ...............................8 INDICATORS ..............................9 USING THE RADIO (2 CHANNEL) ......................11 USING THE OPTIONAL EIGHT (8) OR SIXTEEN (16) CHANNEL RADIO (WITHOUT SCAN) ...11 SCAN OPERATION ............................11 TO PROGRAM SCAN CHANNELS AND SELECT PRIORITY ..............12 USING THE OPTIONAL EIGHT (8) OR SIXTEEN (16) CHANNEL RADIO (WITH SCAN) ....13... -
Page 4: Specifications
LBI-38435B SPECIFICATIONS* SYSTEM MLSL161 (29.7-42 MHz) Radio Type FCC# MLSL261 (42-50 MHz) Frequency Range: Transmitter 29.7 to 42 MHz, 42 to 50 MHz Receiver 29.7 to 42 MHz, 42 to 50 MHz Transmitter Two Frequency Spread 1 MHz Receiver Two Frequency Spread 1 MHz Battery Drain: Receiver (13.8 VDC) - Page 5 LBI-38435B SPECIFICATIONS* (Continued) Distortion Less than 3% (1000 Hz) Less than 5% (300 Hz to 3000 Hz) Deviation Symmetry + 0.5 kHz (maximum) RF Output Impedance 50 ohms Carrier Attack Time 30 milliseconds (maximum) Audio Attack Time 50 milliseconds (maximum)
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Page 6: Description
LBI-38435B Transmitter DESCRIPTION The Transmitter circuit consists of a broadband, The Com-Net Ericsson MLS series mobile radio is a fixed-tuned driver module and a power amplifier. synthesized, wide-band radio, utilizing microcomputer The RF power output level is internally adjustable for technology to provide high reliability, high quality, and rated power output. -
Page 7: Figure 1 - Mls Mobile Two-Way Fm Radio
LBI-38435B Figure 1 – MLS Mobile Two-Way FM Radio... -
Page 8: Operation
LBI-38435B There are five (5) different optional interchangeable Carrier Control Timer control panels available for selecting a two channel radio, an eight (8) or sixteen (16) channel radio. The five The Carrier Control Timer turns off the transmitter control panels are as follows: after the microphone push-to-talk (PTT) switch has been •... -
Page 9: Indicators
LBI-38435B conjunction with CHANNEL MONITOR A momentary type switch to allow you switch, it enables the ADD/DELETE to monitor the selected channel before function to allow the scan list to be transmitting a message. It disables modified. When turned on, the scan Channel Guard and squelch and will indicator is illuminated. -
Page 10: Figure 3 - Eight Channel Radio Without Scan/With Scan
LBI-38435B • • When scan is off, the selected channel is channel is shown when no signal is being shown. received. When a scan channel is being received and audio is present in the speaker, • When scan is on, the last pre-scan selected the received channel is shown. -
Page 11: Using The Radio (2 Channel)
LBI-38435B Select the desired channel by pressing either the USING THE RADIO (2 CHANNEL) ADD or DELETE switch. To Receive a Message: Press and hold MONITOR switch and then adjust the VOLUME controls for the desired Turn the radio on (channel indicator lit). If not, listening level. -
Page 12: To Program Scan Channels And Select Priority
LBI-38435B • channels. The scan rate will be faster when fewer Radio is in scan mode but there is no carrier channels are programmed into scan memory. activity to top the scan on any channel. Removing the microphone from its hookswitch... -
Page 13: Using The Optional Eight (8) Or Sixteen (16) Channel Radio (With Scan)
LBI-38435B Press and hold SCAN switch then press the ADD USING THE OPTIONAL EIGHT (8) OR switch twice. The selected channel will now SIXTEEN (16) CHANNEL RADIO (WITH become the Priority 2 channel and the “P2” SCAN) indicator will light to indicate that the channel is now in the scan program as Priority 2. -
Page 14: Dtmf Microphone Modification
LBI-38435B • If an external speaker is desired with the DTMF Receiver Voltage Readings microphone, perform the following • IC and Chip Component Replacement modifications: Procedures a) On the Transmitter/Receiver board (A802), Also provided in the Maintenance Manuals for each... -
Page 15: Interconnection Diagram
INTERCONNECTION DIAGRAM LBI-38435B... -
Page 16: Illustrated Mechanical Parts Breakdown
LBI-38435B ILLUSTRATED MECHANICAL PARTS BREAKDOWN... - Page 17 MECHANICAL PARTS LIST LBI-38435B...
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Page 18: Interconnection Kit (Jhm-156S)
INTERCONNECTION KIT LBI-38435B... - Page 19 LBI-38435B This Page Intentionally Left Blank...
- Page 20 Com-Net Ericsson Critical Radio Systems, Inc. P.O. Box 2000 Lynchburg, Virginia 24501 1-800-528-7711 (Outside U.S.A. 804-592-7711) Printed in U.S.A.
- Page 21 ADDENDUM NO. 1 TO LBI-38435B (PCML) This addendum covers connection changes when using External Speaker Option LS1D with MLS Mobile Radios. It also covers a part number change for the radio Front Cabinet. EXTERNAL SPEAKER OPTION LS1D The MLS radio is normally configured for internal speaker operation. When an external speaker is used, J551 jumper connections on the Transmitter/Receiver board must be changed.
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