ULB-362B Underwater Locator Beacon
3
User’s Manual
January 2018
Internal Construction
The major internal components of the beacon include a printed circuit board
assembly, a urethane-encapsulated transducer assembly, and a battery. The
battery is contained in its own, separate, user accessible compartment.
Theory of Operation
The printed circuit board assembly generates all the necessary logic functions
to produce a pulse with the desired characteristics. The pulse is then
transformed from a CMOS level square wave to a much larger sinusoidal
pulse by a transformer. The output of the transformer drives the epoxy-
encapsulated transducer, which propagates through the housing in the form
of a tuned acoustic signal based on the frequency of the beacon (27kHz,
37.5kHz, or 45kHz).
Locating the Beacon
When the beacon is immersed in water, it will begin to radiate an acoustic
signal which can be received and transformed into a visual signal by using the
RJE International, Inc. STI-350, DTI-300A, DPR-275 or VADR6000M
Acoustic Receivers. When using the STI-350 Surface Acoustic Receiver, the
general vicinity of the ULB-362B beacon can be located from shipboard. After
the area is known, a diver can be deployed with the DTI-300A diver acoustic
receiver, which will give the exact location of the beacon. When recovery is
too deep for diver operations, a VADR receiver, mounted on a ROV, can be
used. Other equivalent pinger receivers may also be used to relocate the
ULB-362B beacon.
Figure 1-4 Locating the ULB-362B After Water Activation
