EA 400
156
857-160981 / I
Mode
Active - The transmitter and receiver are active (normal
operation).
Passive - The transmitter is passive while the receiver is active.
This mode of operation is u seful for test purposes, and when
you wish to measure the ambient background noise in the sea.
Test - The transmitter is passive and the receiver is active. Each
General Purpose Transceiver board includes a signal generator
injecting a weak test signal (-70.0 dBW) into the receiver’s
input circuitry. The nominal power reading at the display is
-70.0 dBW f o r channels using one transceiver board (1 or 2
kW).
Label
This function allows you to enter a text string to appear on the
right hand side of the curr ent frequency in the Header view.
Transmit Power
This parameter controls the transmitter’s output power. Output
power is limited either to the maximum rating of the transducer,
or the maximum rating of the transmitter, whichever is the
smallest.
Pulse Length
This parameter controls the duration of the transmit pulse.
The table below shows the pulse lengths (given in µS) available
for the different operational frequencies.
-- 64 128 256 512 1024 2048 4096 8192 16384
38 kHz -- -- X X X X X -- --
50 kHz -- X X X X X -- -- --
70 kHz -- X X X X X -- -- --
120 kHz X X X X X -- -- -- --
200 kHz X X X X X -- -- -- --
710 kHz X X X X X X -- -- --
Table 1 X-axis is pulse length in
µ
S, Y-axis is frequency in kHz.
“x” means that the pulse length is available for the given frequency.
Transducer
Type - The transducer currently connected to the transceiver is
identified.
Draft - In order to measure correct water depth, the echo
sounder needs to know the vertical distance between the vessel’s
water line and the transducer face. Here, enter the depth of the
transducer face relative the waterline.
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