Echo sounders and integrators:
|
Frequency |
38 kHz |
120 kHz |
|
Basic range (m) |
0-100/0-250+250 |
0-100 |
|
Bandwidth |
3.0 kHz |
3 kHz |
|
Pulse length |
0.6 msec |
0.6 msec |
|
TVG and gain |
20 logR - 20 dB |
20 logR - 0 dB |
|
Recorder gain |
7 |
2 |
|
Transmitter power |
1822 W |
298 W |
|
Transducer dimension (ceramic) |
8° × 8° |
10° circular |
|
Discriminator |
4-7 |
5-6 |
|
Source level + voltage response |
137.8 dB |
114.9 dB |
|
Measured |
August 1983 |
August 1983 |
|
Integrator threshold |
A: 1 |
0.5 |
|
B: 1 |
0.5 |
|
|
Integrator gain |
A: 20 dB × 10 |
10 dB × 10 |
|
B: 20 dB × 10 |
10 dB × 10 |
|
|
Depth intervals (m) |
A: 4-50 |
4-50 |
|
B: 50-250 (varying with depth) |
50-100 |
|
|
Bottom stop |
On |
On |
Sonar S 109 was used for pelagic school counting. The beam was fixed 90° starboard with 5° tilt. Schools within 50-150 m range were counted.
