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1. GENERAL
This chapter describes the basic operations of the transmitter unit. Most of operations are
CPU controlled.
1.1 POWER SUPPLY
The transmitter unit is automatically powered by the pressure switch when it descends 10
m in the sea and turned off when it ascends to 5m deep point.
1.2 UPWARD AND DOWNWARD SOUNDING
The transmitter unit incorporates only one sounding transmitter/receiver circuit. The upward
and downward transducers are alternately connected to the circuit by the action of a relay.
1.2.1 Sounding Rate
Two kinds of sounding rates are used to improve coverage area.
Standard Rate ("LOW" setting)
Downward
Sounding
Upward
Sounding
The time "T" between the pulses depends on the sounding range setting in the
transmitter unit.
High Rate ("HIGH" setting)
In this rate, sounding is performed three times within one cycle of transmitter operation with
standard rate.
Downward
Sounding
Upward
Sounding
Fig. 1.1 Upward and Downward Sounding in Standard Mode
Fig. 1.2 Upward and Downward Soundings at High Rate
1-1
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