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Comnet LBI-38435B Maintenance Manual

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Comnet LBI-38435B User Manual
Comnet LBI-38435B User Guide
Comnet LBI-38435B Online Manual

Text of Comnet LBI-38435B User Guide:

  • 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................

  • Comnet LBI-38435B, LBI-38435B 2 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 The software contained in this device is copyrighted by Com-Net Ericsson Critical Radio Systems, Inc. Unpublished rights are reserved under the copyright laws of the United States.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 notice. Such changes will be incorporated into new editions of this manual. No part of this manual

  • LBI-38435B 3 TABLE OF CONTENTS SPECIFICATIONS..................................................................................................................................................4 DESCRIPTION........................................................................................................................................................6 OPERATION ............

  • Comnet LBI-38435B, LBI-38435B 4 SPECIFICATIONS* SYSTEM Radio Type FCC# Frequency Range: Transmitter Receiver Transmitter Receiver Battery Drain: Receiver (13.8 VDC) Off Squelched Unsquelched Transmitter (13.6 VDC) Frequency Stability Channel Spacing Frequency Capacity Temperature Range Duty Cycle Dimensions (H X W X D) (Less Accessories) Weight (Less Accessories) TRANSMITTER Power Output Conducted Spurious Modulation Audio Sensitivity Audio Frequency Characteristics (Per RS-152B) MLSL161 (29.7-42 MHz) MLSL261 (42-50 MHz) 29.7 to 42 MHz, 42 to 50 MHz 29.7 to 42 MHz, 42 to 50 MHz Two Frequ

  • Comnet LBI-38435B, LBI-38435B 5 SPECIFICATIONS* (Continued) Distortion Deviation Symmetry RF Output Impedance Carrier Attack Time Audio Attack Time RECEIVER Audio Ampl Output (4-ohm speaker) Sensitivity 12 dB SINAD (EIA method) 20 dB (Quieting method) Selectivity (EIA two-signal method) Spurious Response Intermodulation Modulation Acceptance Frequency Response RF Input Impedance Receiver Attack Time Receiver Recovery Time Less than 3% (1000 Hz) Less than 5% (300 Hz to 3000 Hz) + 0.5 kHz (maximum) 50 ohms 30 milliseconds

  • Comnet LBI-38435B, LBI-38435B 6 DESCRIPTION The Com-Net Ericsson MLS series mobile radio is a synthesized, wide-band radio, utilizing microcomputer technology to provide high reliability, high quality, and high performance in two-way, FM, mobile communication. The MLSL161 and MLSL261 radios operate in the 29.7 to 42 MHz and the 42 to 50 MHz frequency ranges respectively and provide an RF power output of 60 watts with an allowable channel separation of 1 MHz transmit and 1 MHz receive. The small size of the MLS makes it ideal for front mounting in conventional vehicles, with all operating controls and indicators located on the Control Panel. The standard radio w

  • Comnet LBI-38435B, LBI-38435B 8 There are five (5) different optional interchangeable control panels available for selecting a two channel radio, an eight (8) or sixteen (16) channel radio. The five control panels are as follows: • Optional MK1J: Two (2) Channel without Scan (19A705800P100) • Option MK1L: Eight (8) Channel without Scan (19A705800P101) • Option MK1N: Eight (8) Channel with Scan (19A705800P102) • Option MK1P: Sixteen (16) Channel without Scan (19A705800P103) • Option MK1R: Sixteen (16) Channel with Scan (19A705800P104) Optional Control Panels 19A705800P100 thru P104 are for use in MLS radios 19A705800P1 thru P7 ONLY

  • Comnet LBI-38435B, LBI-38435B 9 MONITOR A momentary type switch to allow you to monitor the selected channel before transmitting a message. It disables Channel Guard and squelch and will allow you to hear noise if the channel is not busy. This may be convenient when setting the volume to the desired listening level. CHANNEL Two momentary type switches. Press CHAN 1 (up arrow) to select channel 1; press CHAN 2 (down arrow) to select channel 2. The selected channel number will be illuminated on the control module. With an eight or sixteen channel

  • Comnet LBI-38435B, LBI-38435B 10 • When scan is off, the selected channel is shown. • When scan is on, the last pre-scan selected • channel is shown when no signal is being received. When a scan channel is being received and audio is present in the speaker, the received channel is shown. Figure 3 – Eight Channel Radio Without Scan/With Scan Figure 4 – Sixteen Channel Radio Without Scan/With Scan

  • Comnet LBI-38435B, LBI-38435B 11 USING THE RADIO (2 CHANNEL) To Receive a Message: 1. Turn the radio on (channel indicator lit). If not, press POWER switch. 2. Select the desired channel by pressing either the 1 or 2 switch. 3. Press and hold MONITOR switch and then adjust VOLUME controls for the desired listening level. Release MONITOR switch. 4. Radio is now ready to receive a message. To Transmit a Message: 1. Confirm that the radio is turned on (channel indicator lit). If not, press POWER switch. 2. Select the desired channel by pressing either the

  • Comnet LBI-38435B, LBI-38435B 12 channels. The scan rate will be faster when fewer channels are programmed into scan memory. Scan operation will be determined by the following conditions: • Priority 1, Priority 2, and Non-Priority Programmed* The Priority 1, Priority 2, and up to six (6) remaining channels in an eight (8) channel radio or fourteen (14) channels in a sixteen (16) channel radio will be scanned. Once a carrier is detected (or correct Channel Guard tone is decoded), the digital display will indicate the channel. Sampling of the Priority 1 and Priority 2 channels continues while receiving a message on a non-priority ch

  • Comnet LBI-38435B, LBI-38435B 13 2. Press and hold SCAN switch then press the ADD switch twice. The selected channel will now become the Priority 2 channel and the “P2” indicator will light to indicate that the channel is now in the scan program as Priority 2. 3. Release SCAN switch. Priority 1 (P1)** 1. Perform steps 1 through 3 of the Non-Priority procedure. 2. Press and hold SCAN switch; then press the ADD switch three times. The selected channel will now become the Priority 1 channel and the “P1” indicator lights to indicate that the channel is now in the scan program as Priority 1. 3. Release SCAN switch. **If a Pri

  • Comnet LBI-38435B, LBI-38435B 14 • Receiver Voltage Readings • IC and Chip Component Replacement Procedures Also provided in the Maintenance Manuals for each circuit board are IC DATA SHEETS with information about each IC package used on that particular circuit board. DTMF MICROPHONE MODIFICATION 1. Remove the top radio cover and locate the System Control/Synthesizer board (A801). 2. To isolate J701-1 from the printed board, carefully cut the zigzag run on the component side of the board near capacitors C613 and C615 (see Figure 5). 3. Solder a wire (#24 AWG) to J701-1 on the component side of the board. 4. Solder the other end of this wire to the output of the 9-Volt Regulator IC

  • Comnet LBI-38435B, 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. SPEAKER Internal External J551 CONNECTION J551-1 to J551-2 J551-2 to J551-3 MECHANICAL PARTS LIST Change from: 42 B19/MT

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