Kongsberg EM 2040 MKII, Руководство по установке

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Baffle for multipath reduction
To avoid multipath via surface or other objects, it can be useful to mount a “baffle”
on each side of the transmit transducer.
The baffle must be made of POM (Polyoxymethylene) material.
Single RX
The baffle should be mounted horizontally 16 mm above the transmit transducer face.
The width of the baffle should be minimum 100 mm on all sides of the transducer. There
should be a clearance of 0 - 0.5 mm between the transducer and the baffle.
With a single receive transducer, the transmit transducer beam pattern across is wider
than the angular coverage of the receiver beams, especially for the lowest frequencies.
Dual RX
With a dual RX system the across coverage is up to 220 degrees. To avoid multipath via
surface or other objects, the same type of baffle as for single RX should be used.
For TX angles > 80 degrees from the vertical, the baffle should be mounted with
approximately 10 degrees larger angle.
Example: If 100 degrees coverage is required to one side, the baffle should be mounted
at 110 degrees (rotated 20 degrees up).
KONGSBERG EM 2040 MKII Installation Manual