CDL Datum Underwater Modem – Available for rental, hire and ex-rental purchase from Ashtead Technology.
DATUM is an acronym for Digital Acoustic Transponder & Underwater Modem. The CDL DATUM system uses state of the art spread spectrum and digital signal processing technology to offer a long range high speed device for use in ranging and data applications in deep water.
Purpose designed algorithms provide high reliability data communications with a bit error rate of 10 e-6 or better with very high immunity to noise, Doppler fading and multi-path effects.
Each unit is uniquely addressable and the system is networkable. Data can be sent or received from any DATUM in the network.
The DATUM is available in ship/ROV mount version or with integrated battery pack. DATUM is also available with a number of options which add facilities for pitch, roll, heading, temperature, and depth.
|OPERATING RANGE / ENVIRONMENT|
|Range||3km approx (line of sight)|
|Data Rates||100 or 480 bits per second|
|Bit Error Rate||10(-6) bit error rate or better|
|Accoustic Doppler Tolerance||High immunity to noise and to multi-path and Doppler fading.|
|Tolerance of =/- 5ms-1|
|Bandwidth||Broadband operation 16Khz to 30Khz|
|Modulation||Direct sequence spread spectrum / OFDM|
|Error Detection||CRC16 error detection|
|Output Rate||1200, 2400, 4800, 9600 baud|
|Electrical Connection||Burton 8 pin Connector|
|Power Rating||Listen Mode - 1 watts approx @ 18VDC Transmit Mode - 3.5 watts approx @ 18VDC|
|Transducer Head diameter||80mm||3.1"|
|Weights||3kg (in air), 1kg (in water)||6.6lbs (in air), 2.2lbs (in water)|