Ericsson LBI-39181, 344A4611P1, 344A4611P2 Maintenance Manual
Maintenance Manual
DTMF Microphone
344A4611P1 & P2
LBI-39181
ericssonz
LBI-39181
TABLE OF CONTENTS
INFORMATION TO USERS........................................................................................................................... 2
GENERAL........................................................................................................................................................ 3
FEATURES...................................................................................................................................................... 3
SPECIFICATIONS........................................................................................................................................... 4
MOUNTING .................................................................................................................................................... 4
MICROPHONE CABLES................................................................................................................................ 5
MICROPHONE CONNECTOR WIRING....................................................................................................... 5
ADJUSTMENTS.............................................................................................................................................. 5
OPERATION.................................................................................................................................................... 6
SERVICE INSTRUCTIONS............................................................................................................................ 6
REPLACEMENT PARTS................................................................................................................................ 7
OPTIONAL ACCESSORY.............................................................................................................................. 8
SCHEMATIC DIAGRAM ............................................................................................................................... 9
Page
INFORMATION TO USERS
This equipment has been tested and found to comply with the limits
for a Class B digital device, pursuant to Part 15 of the FCC Rules, and as
set out in the Radio interference Regulations of the Canadian Department
of Communications. These limits are designed to provide reasonable
protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no
guarantee that interference will not occur in a particular installation. If this
equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one or more of the
following measures:
Reorient or relocate the receiving antenna.
•
Increase the separation between the microphone and receiver.
•
Connect the microphone transmitter to an outlet on a circuit
•
different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for
•
help.
CREDITS
MODULINK, ARMO-DUR, Million-Cycle Plus, and Top-Talk Sound Channels are trademarks of Shure Brothers Inc.
NOTICE!
This manual covers Ericsson and General Electric products manufactured and sold by Ericsson Inc.
NOTICE!
Repairs to this equipment should be made only by an authorized service technician or facility designated by the supplier. Any
repairs, alterations or substitution of recommended parts made by the user to this equipment not approved by the manufacturer could void the user’s authority to operate the equipment in addition to the manufacturer’s warranty.
NOTICE!
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device
may not cause harmful interference, and (2) this device must accept any interference received, including interference that
may cause undesired operation
This manual is published by
inaccuracies of current information, or improvements to programs and/or equipment, may be made by
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, without the express written permission of
Copyright September 1995, Ericsson Inc.
Ericsson Inc.,
without any warranty. Improvements and changes to this manual necessitated by typographical errors,
2
Ericsson Inc.,
at any time and without notice. Such
Ericsson Inc.
GENERAL
LBI-39181
easily visible during night operation and minimizing eye
readjustment for night vision.
Model 344A4611 is a hand-held, amplified, condenser
DTMF communications microphone with an illuminated
keypad. The microphone is ideal for upgrading existing twoway radios for use with advanced telephone interconnect
systems or for new installations. It is designed for rugged
and reliable operation in any mobile communications
application. The microphone has an omni-directional pickup
pattern and provides extremely clear transmission, even in
noisy environments. In addition to its clear, crisp, natural
voice response, the microphone has extremely low
sensitivity to hum pickup and low susceptibility to radio
frequency interference.
For installations where transmitter input gain requires
sensitivity modification, the microphone has convenient,
externally accessible screwdriver controls for independent
adjustment of both microphone and DTMF levels. This
eliminates the problem of fixed audio levels and the
necessity for disassembling the microphone for adjustments.
Restricting control access also prevents accidental changes
common to external controls.
The microphone is designed for use with most currently
available mobile two-way radio transceivers. For installation
convenience, all microphone and signalling functions,
including keypad illumination, are powered directly from the
microphone input circuit of most transmitters, minimizing
the need for equipment modification. The microphone is
compatible with a choice of five-conductor, pre-wired, coilcord MODULINK
type modular plug on the microphone end, and a choice of
popular transmitter input connectors on the other. The cables
are instantly changed or replaced without soldering.
®
cables, each of which has a telephone-
The microphone is supplied with a small screwdriver
for adjusting the microphone amplifier gain and DTMF
level, and for releasing the modular-plug microphone cable
from the microphone.
FEATURES
• Top-Talk Sound Channels™ for clear voice input, easy
handling
• Built-in transistor amplifier (powered by carbon-
microphone- type circuit)
• Frequency response from 200 to 4,000 Hz, tailored for
voice communications
• Illuminated keypad with positive tactile feel and audible
confirmation tones
• Auto push-to-talk (APTT) automatically keys trans-
mitter when keypad is depressed
• Convenient external microphone gain adjustment
accommodates most input circuits
• Simple, easy-to-use continuous-tone dialing
• Externally accessible DTMF level adjustment,
independent of microphone gain setting
• Modular-plug coil-cord-easily attached and removed
• Low susceptibility to radio frequency interference
The microphone features attractive, contemporary
styling, designed to blend with most radio designs and
vehicle interiors. The microphone is ergonomically
designed; it fits naturally and comfortably in the hand and is
not affected by heat or humidity. T he rugged ARMO-DUR
case is immune to oil, grease, most fumes and solvents, salt
spray, sun, rust and corrosion. It is outstanding in its ability
to withstand mechanical shocks and vibration. The MillionCycle PIus™ leaf-type switch is a double-pole, single-throw
type, designed to resist the effects of severe operating
conditions and constant usage. It has nickel-silver blades,
and its contacts are palladium-alloyed for reliable,
oxidation-free operation.
The microphone’s keypad is made of tough silicone
rubber, with durable printed characters that will last the life
of the microphone. The keypad is backlit by red LEDs,
• Low sensitivity to hum pickup
• Rugged Million-Cycle Plus leaf-type switch stands up
®
under severe environments and constant use
• High-impact ARMO-DUR case - stronger and lighter
than diecast metal, comfortable to the touch in hot or
cold weather
• Rugged and dependable under all operating conditions
• Hang-up button connection available for microphone
hang-up sensing (mounting bracket must be grounded)
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