O
TS MIL
CO
M
S
URF
ACE
22
ZONES OF SILENCE
Large natural or man-made objects can block acoustical transmission under cer
-
tain conditions, in much the same way that a rock blocks a fast-moving current
of water. Close to the backside of the rock, in this example, the current is absent
and the water seems still. A short distance away, the current is flowing again.
Similarly, acoustic energy in the water can be blocked if the transmitting source is
close to a large object. On the backside of the blocking object, a “zone of silence”
is formed in which reception of the transmitted signal is not possible. Divers can
reduce “zones of silence” by moving away from, around, or above the blocking
object until communication is re-established.
Under some conditions, when a diver’s suit and body are directly between the
transmitting Milcom 6000 Surface Station and the diver’s radio, a small zone of
silence may be created that prevents reception. This effect can become greater
at longer ranges. The diver turning 45 degrees in any direction eliminates this
zone of silence.
For more information on Wireless Communications, visit the Learning Center on
our website at: WWW.OTSCOMM.COM
Summary of Contents for MilCom Surface Station 6000S
Page 1: ...A B User Manual Surface Station...
Page 29: ...OTS MILCOM SURFACE 23 Notes...
Page 30: ...OTS MILCOM SURFACE 24 Notes...
Page 31: ...OTS MILCOM SURFACE 25 Notes...
