The Cetacean Research C305 hydrophones have 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
Linear Frequency Range (±3dB) [kHz] 0.012 to 250+
Usable Frequency Range (+3/-12dB) [kHz] 0.005 to 250+
Transducer Sensitivity [dB, re 1V/µPa] -201
Preamplifier Gain [dB] +33
Effective Sensitivity* [dB, re 1V/µPa] -168(Effective Sensitivity = Transducer Sensitivity + Preamplifier Gain)
SPL Equiv. Self Noise at 1kHz [dB, re 1µPa] Approximately 63
Power Requirement [Vdc] 5 to 32
RMS Overload Acoustic Pressure [dB, re 1µPa] 172 to 189
Maximum Operating Depth [m] 460 (1000 m versions are available)
Operating Temperature Range [ºC] -40 to +60
Output Impedance [Ohm] 10
Dimensions [mm] 83 Length x 32 Width x (25 to 6)T
Integral Connector Subconn MCBH3MSS
Shielded Cable Length [mm] Mating connector molded to 15, 30, or 50 [m] shielded cable, other lengths available, cable includes Integral Connector rated to a depth of 7000 m
omnidirectional below 10kHz
very directional at high frequencies (e.g., ~15º solid angle at 200 kHz,
directionality pattern is a dipole.

Battery / Connector box
Battery boxes are rated NEMA-4X water resistant. Standard signal connection for the Cetacean Research C305 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 (including connectors)

C305 Hydrophone

C305 Hydrophone Frequency Response

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