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 TM 55-1905-220-14-9
4-47.3. LOUD HAILER - MAINTENANCE INSTRUCTIONS (Continued).
(b) Quick operational check. A condensed listing of the above test are given below. The
particular test, the control settings for the test, and the normal operation to be expected are arranged in
columnar form. IF desired this table may be used as a check off list for performing the simple operational test
at any time.
TEST
CONTROL SETTING
NORMAL OPERATION
Normal speech into micro-
Volume control below
Clear undistorted
phone outdoors.
maximum setting.
reproduction.
Less than maximum
volume.
Normal speech into micro-
Volume control at
Clear undistorted
phone outdoors.
maximum setting.
reproduction.
Full volume reproduced.
Normal speech into micro-
Volume control at
Loud hailer feeds
phone, horn pointed at a
maximum setting.
back and howls.
hard wall.
Normal speech into micro-
Volume control
Howling stops well before
phone, horn pointed at a
backed off.
volume control reaches
hard wall.
minimum setting. Speech
reproduction at lower volume
than maximum but clear
and undistorted.
4-1204
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