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1.0
DESCRIPTION
1.1
The ACR/EM-2BA is a battery operated solid state megaphone
specifically developed for use in enclosed areas such as in the interior of
an aircraft or ship cabin. It has been designed to minimize regenerative
acoustic feedback that results in whistling and other oscillations of this
nature. It has a 90° sound projection angle to direct the sound to persons
in its immediate vicinity, as well as in the rear sections of any aircraft.
The amplifier frequency band-pass has been selected to produce a crisp,
clear reproduction of voice signals. The operating power level is also
sufficient to provide adequate sound under high ambient noise level
conditions without being over-powering. Specific attention has been
given to the physical size so that it can be used effectively in a crowded
environment.
1.2
The integrated circuit amplifier only uses a small current when turned
"ON". Large currents necessary to drive the speaker are utilized only on
voice peaks. This extends the life of the batteries so that several hours of
operation may be expected when used normally in an intermittent manner.
Batteries should be replaced periodically as recommended by the
manufacturer. (See section 5.0) A simplified block diagram of the
megaphone is shown in Figure 1.
1.3
A battery test circuit is included. A flashing green LED indicates that the
battery is Ok.
2.0
TECHNICAL DATA
Dimensions
Weight
Materials
Attachment
Gain Control*
Amplifier
Speaker
5.5" max diameter bell, 11.5" max long
2.3 lbs., including batteries
Horn, handle – Anodized Aluminum
Housing – Aluminum
Neck strap at top of unit
Thumb operated
Integrated circuit, 3 watts power output
Re-entrant horn and driver type;
input power five (5) watts;
90° dispersion angle
2
Y1-03-0057 Rev. F
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