Simrad 18-11 - REV C User manual

18 kHz single-beam transducer
for large depths
(859-130404 Rev.C)
Introduction
The 18-11 is a large, single-beam transducer with a
relatively narrow beam. It is ideal for use in ocean
depth measurement to a maximum depth of 7000 m.
Order number
KSV-088693
Technical specication
Resonant frequency.........................................18 kHz
Circular beamwidth.....................................11 ±2 deg
Directivity:
D .......................................................... 300 ±20 %
DI=10 log D ...........................................25 ±1 dB
Equivalent two-way beam angle:
ψ....................................................... 0.020 ±20 %
10 log ψ ............................................... -17 ±1 dB
Side lobes..........................................less than -18 dB
Back radiation ...................................less than -35 dB
Impedance:
Nominal value .......................................... 60 ohm
Max. variation in |Z| ........................ 45 to 80 ohm
Max. variation phase angle.......................±30 deg
TRANSDUCER
Simrad 18-11
Transmitting response ................................176 ±2 dB
(dB re 1µPa per V)
Receiving sensitivity, open circuit ........... -168 ±2 dB
(dB re 1V per µPa)
Electroacoustic efciency ......................... 0.60 ±0.20
Maximum pulse power input .........................2000 W
Maximum continuous power input ..................100 W
Maximum transducer depth ............................... 50 m
Cable length ....................................................... 20 m
Cable diameter ................................................ 11 mm
Weight without cable .........................................85 kg
Storage temperature ..............................+70 to -20 °C

Manufacturer:
Simrad AS
Strandpromenaden 50
P.O.Box 111
N-3191 Horten
Telephone: [phone]
Telefax: [phone]
Internet: www.simrad.com
Admittance
Outline dimensions
Beam pattern
Installation example
Data
Installation