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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
1 or 2 switch.

3.

 

Press and hold MONITOR switch and then
adjust VOLUME controls for the desired
listening level. Release MONITOR switch.

4.

 

Decide what you want to say. If you intend a
lengthy message (or several messages) the
vehicle engine should be running to maintain the
battery charge.

5.

 

Observe the BUSY indicator and press the
MONITOR switch to assure that the channel is
not in use.

6.

 

Remove microphone from hookswitch, press the
PTT switch and identify yourself. The XMIT
indicator will light each time the PTT switch is
pressed.

7.

 

Release the PTT switch and wait for an answer
to your call. Then, complete your message.

Always speak in a normal voice. Hold the
microphone cupped in your hand and touching
your cheek lightly. Speak across the face of your
microphone, not directly into it. Shouting will
actually reduce your radio range, so do not speak
any louder than normal.

USING THE OPTIONAL EIGHT (8) OR
SIXTEEN (16) CHANNEL RADIO
(WITHOUT SCAN)

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
ADD or DELETE switch.

3.

 

Press and hold MONITOR 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 the desired
listening level. Release MONITOR switch.

4.

 

Decide what you want to say. If you intend a
lengthy message (or several messages) the
vehicle engine should be running to maintain the
battery charge.

5.

 

Observe the BUSY indicator and press the
MONITOR switch to assure that the channel is
not in use.

6.

 

Remove the microphone from the hookswitch,
press the PTT switch and identify yourself. The
XMIT indicator will light each time the PTT
switch is pressed.

7.

 

Release the PTT switch and wait for an answer
to your call. Then, complete your message.

SCAN OPERATION

The SCAN function allows monitoring of up to eight

or sixteen receive channels (depending upon which
control module is being used). The scanned channels may
be any frequency within the frequency band limits of the
radio and may be Channel Guard protected. The radio
message will then be received only if the correct Channel
Guard signal is present.

Any channel may be scanned with or without priority

level.  One channel may be programmed for Priority 1
(P1) and another for Priority 2 (P2) with any or all
remaining programmed channels being scanned as non-
priority (S).

Receive Scan Rate

The scan rate for the radio will vary depending upon

the number of channels programmed into the scan
memory and whether or not Channel Guard is
programmed.  For a sixteen channel radio, the scan rate
will vary from 1.1 to 4.4 seconds for non-priority
channels, and 0.3 to 1.2 seconds for Priority 1 and 2

NOTE

Содержание LBI-38435B

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

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

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

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

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

Страница 19: ...LBI 38435B 19 This Page Intentionally Left Blank ...

Страница 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 ...

Страница 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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