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S2CR 18/34H Acoustic Modem

S2CR 18/34 Underwater Acoustic Modem
S2CR 18/34H
S2CR 18/34H
S2CR 18/34H Directivity Pattern

S2CR 18/34H Underwater Acoustic Modem

S2CR 18/34H with a horizontally omnidirectional transducer beam pattern is a universal tool for communication in vertical and slant channels, providing data transfer rates up to 13.9 kbit/s over a 3500 m range.


  • Medium-range operations in vertical and slant channels
  • Data link for AUVs and ROVs
  • Underwater acoustic sensor networks

Data Sheets

Underwater Acoustic Modem S2CR 18/34H Product Information, pdf


Operating Depth200 m, Delrin housing
1000 m, Aluminium Alloy housing
2000 m Stainless Steel housing
2000 m Titanium housing
Operating Range 3000 m
Frequency Band 18 - 34 kHz
Transducer Beam Pattern hemispherical
Acoustic Connection up to 13,9 kbit/s
Bit Error Rate less than 10-10
Internal Data Buffer 1 MB, configurable
Host Interface[1]  Ethernet, RS-232 (RS-485/422 optional)
Interface Connector up to 2 SubConn® Metal Shell1500 Series
Power Consumption Stand-by Mode 2.5 mW
Listen Mode[2] 5 - 285 mW
Receive Mode[3] 0.8 W
Transmit Mode:
2.8 W, 1000 m range
8 W, 2000 m range
35 W, 3500 m range
65 W, max. available
Power Supply[4] External 24 VDC (12 VDC optional) or
Internal rechargeable battery (optional)
Dimensions[5] Housing ø110 mm x218 mm
Total length 300 mm
Weight, dry/wet Delrin: 3100/500* g
Aluminium Alloy*: 2170/1470 g
Stainless Steel* 9400/6900 g
Titanium* 6500/4500 g

[1] See the Underwater Acoustic Modem S2CR 18/34H Product Information for available standard interface combinations.

[2] User-configurable Listen Mode is only available with a Wake-Up module installed. Power consumption in Listen Mode depends on Listen Mode settings.

[3] Power consumption for the RS-232 interface option. Add 500 mW for the Ethernet interface option.

[4] Contact EvoLogics for more information on power supply options.

[5] Dimensions of a Delrin housing, other builds are slightly larger. Marked* weights are estimates.

Specifications subject to change without notice.