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 TM 55-1905-219-14-9
4-46.3. LOUD HAILER - MAINTENANCE INSTRUCTIONS (Continued).
(b) Description of controls. There are three controls on this equipment. The trigger switch
located in the front of the pistol-grip handle closes the battery supply circuit to the equipment. The toggle
switch in the base of the handle permits selection of either internal dry batteries (when operated to "INT") or
external battery supply (when operated to "EXT"). The volume control is operated by the knob located on the
rear housing directly under the microphone grille.
(c)
Sequence of operation. To operate the loud hailer effectively proceed as follows:
1
Internal or external power supply.
a
Decide whether internal or external battery supply is to be used. For
general use, during which short, intermittent messages are delivered, the
internal battery is satisfactory and most convenient. When extended use
and long messages are anticipated use an external battery.
b
Operate the toggle switch to "INT" for use with internal battery.
c
Operate the toggle switch to "EXT" for use with an external battery. Plug
the external battery cable into the receptacle in the handle and secure with
the locking ring. Connect the battery clips observing proper polarity to a 12
volt storage battery.
2
Use of loud hailer.
a
Hold the loud hailer up to the mouth with the microphone as close as
possible. Actuate the trigger switch, with the first and second fingers of the
hand that is grasping the handle. If the system feeds back, back off the
volume control until feedback :stops. If, however, there is no feedback to
start with, as will occur if there are no reflecting surfaces, increase the
volume setting as far as possible without feedback starting. It is advisable
to-talk test (1, 2, 3, 4, etc.) while making these adjustments. Release the
trigger switch as soon as the adjustment is satisfactory.
b
This switch is to be operated, only when it is necessary to transmit a
message, and should then be released immediately. This is particularly
important when operating from the internal dry battery, in order to obtain
the maximum battery life.
4-1168
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