Comnet LBI-38435B Maintenance Manual Download Page 21

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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:

B19/MTV003860

Cabinet, front

Change to:

B19/MPBC09868

Cabinet, front

Summary of Contents for LBI-38435B

Page 1: ...ance 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 ...

Page 2: ...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 may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying and recording for any purpose ...

Page 3: ... Figure 3 Eight Channel Radio Without Scan With Scan 10 Figure 4 Sixteen Channel Radio Without Scan With Scan 10 Figure 5 DTMF Microphone Modification 14 Although the highest voltage in this mobile equipment is supplied by the vehicle battery high currents may be drawn under short circuit conditions These currents can possibly heat objects such as tools rings watchbands etc enough to cause burns B...

Page 4: ...s 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 Frequency Spread 1 MHz Two Frequency Spread 1 MHz 0 03 Amperes 0 70 Amperes nominal 1 15 Amperes 4 Watt audio 20 0 Amperes 60 Watts RF 5 ppm 20 kHz 16 Channels maximum 30 C 22 F to 60 C 140 F 80 Receive 20 Transmit 5 5 cm X 18 ...

Page 5: ...covery Time Less than 3 1000 Hz Less than 5 300 Hz to 3000 Hz 0 5 kHz maximum 50 ohms 30 milliseconds maximum 50 milliseconds maximum 4 Watts less than 5 distortion EIA 0 35 microvolts 0 40 microvolts 70 dB 20 kHz 70 dB 70 dB 7 kHz Within 2 0 dB and 8 dB of a standard 6 dB octave de emphasis curve from 300 Hz to 3000 Hz EIA 50 ohms 90 milliseconds typical 150 milliseconds maximum 100 milliseconds ...

Page 6: ...ews securing the front panel to the chassis Transmitter The Transmitter circuit consists of a broadband fixed tuned driver module and a power amplifier The RF power output level is internally adjustable for rated power output Once the level is set a sensing control circuit holds the power constant over the temperature and or voltage variations within specified limits Receiver The dual conversion r...

Page 7: ...LBI 38435B 7 Figure 1 MLS Mobile Two Way FM Radio ...

Page 8: ... 210 Hz 33 standard tones and 104 unique digital codes are available Carrier Control Timer The Carrier Control Timer turns off the transmitter after the microphone push to talk PTT switch has been keyed for a pre programmed time period The timer can be programmed to time out and sound an alert tone in 30 second increments up to 7 5 minutes External Speaker Optional An optional 4 Watt 4 ohm externa...

Page 9: ...y ADD When used in conjunction with the SCAN switch adds channels to the scan list DELETE When used in conjunction with the SCAN switch deletes channels from the scan list SCAN A momentary type switch to turn the scan function on or off When used in conjunction with the CHANNEL switch it enables the ADD DELETE function to allow the scan list to be modified When turned on the scan indicator is illu...

Page 10: ...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 ...

Page 11: ...OR switch and then adjust the 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 depressing either the ADD or DELETE switch 3 Press and hold MONITOR switch and then adjust the VOLUME controls for th...

Page 12: ...s considerably This prevents the non priority signal from being badly distorted by the larger mute times needed to detect Channel Guard If Channel Guard is not programmed for P1 or P2 the scan sampling rate remains fast Transmit In Scan Mode Several characteristics in the transmit mode occur if the radio has been placed in the scan mode of operation Radio is in scan mode but there is no carrier ac...

Page 13: ...tch and confirm channels included on the scan list The scan indicator S P1 P2 will light for each channel programmed USING THE OPTIONAL EIGHT 8 OR SIXTEEN 16 CHANNEL RADIO WITH SCAN Perform the procedure listed in the paragraph Using the Optional Eight 8 or Sixteen 16 Channel Radio Without Scan Scan Mode Press and release SCAN switch to enable the scan function The scan indicator should light and ...

Page 14: ...ear wall of the radio 5 Locate the connector plug on the DTMF microphone and insert the blue wire in P701 1 6 If an external speaker is desired with the DTMF microphone perform the following modifications a On the Transmitter Receiver board A802 connect jumper plug P502 P551 across pins 1 and 2 of J502 J551 IN b Verify that the internal speaker plug P503 P552 is connected to speaker jack J503 J552...

Page 15: ...INTERCONNECTION DIAGRAM LBI 38435B 15 ...

Page 16: ...LBI 38435B ILLUSTRATED MECHANICAL PARTS BREAKDOWN 16 ...

Page 17: ...MECHANICAL PARTS LIST LBI 38435B 17 ...

Page 18: ...INTERCONNECTION KIT LBI 38435B 18 ...

Page 19: ...LBI 38435B 19 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: ...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 MTV003860 Cabinet front Change to 42 B19 MPBC09868 Cabinet front ...

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