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The Cetacean Research Technology C305

The Cetacean Research C305 is a preamplified, flat sensor hydrophone designed for the detection of low frequency, audible, and ultrasonic sounds. It has the wider band available today.
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The Cetacean Research C305 Hydrophone has a directional receive pattern with very wide frequency response for monitoring ultrasonic signals not detectable by competing brands.

The connector is an integral part of the hydrophone. Hydrophones are not individually calibrated but calibrated frequency response measurements can be performed on request.
Specifications for the C305 / C305X
Linear Frequency Range (±3dB) [kHz]: 0.012 to 1200 / 0.012 - 250 for X model
Usable Frequency Range (+3/-20dB) [kHz]: 0.005 - 2000 / 0.005 - 250
Transducer Sensitivity* [dB, re 1V/µPa]: -198
Preamplifier Gain [db]: 20 / 33
Effective Sensitivity* [dB, re 1V/µPa]: -178 / -165
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa]: ~ 63
Power Requirement [Vdc]: 5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa]: 182 to 199 / 169 to 186
Maximum Operating Depth ** [m]: 920
Operating Temperature Range [ºC]: -40 to 60
Output Impedance [ohm]: 10
Dimensions [mm]: 110 L x 38 W x (25 to 11)T
Integral Connector: Subconn MCBH3MSS
Frequency response graph
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Beam pattern
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Battery / Connector box
Battery boxes are rated NEMA-4X water resistant. Standard signal connection for the Cetacean Research C304xx hydrophone is through a watertight female BNC connector.
The hydrophones are powered by a single 9V battery (not included).
Signal Output: Female BNC connector
Battery Life [hours]: > 20
Box Dimensions [mm]: 110 long x 90 wide x 50 high

*  Transducer Sensitivity + Preamplifier Gain = Effective Sensitivity.
**  1,000 meter versions are available. Append "-1k" to the model number to order a hydrophone with a depth rating >1,000 meters.

Shielded Cable Length [m] mating connector molded to 15, 30, or 50 [m] shielded cable, other lengths available on a custom order basis. Cable includes Integral Connector rated to a depth of 7,000 meters.

Directionality: omnidirectional below 10kHz; very directional at high frequencies (e.g., ~15º solid angle at 200 kHz, -3dB); directionality pattern is a dipole, directionality focused in a plane.
  • removable in-line high-pass filter
  • external power supply support

Shielded Cable Length [m]: mating connector moulded to 15, 30, or 50 [m] shielded cable as standard, different lengths available on order.

Cable includes Integral Connector rated to a depth of 7,000 meters.

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