Benthowave Instrument Inc.

BENTHOWAVE INSTRUMENT INC. Acoustic Transducer & System 

Transmitting and Receiving Switch

BII-2100 Transmitting & Receiving Switching: 0 to 80dB Gain

Usable bandwidth: 1kHz to 4MHz
High Input dynamic range: 96 dB
Programmable gains
Simple interfaces to power amplifier/transducer/DAQ
Automatic switching of transmitting and receiving
Built-in high voltage protection
Built-in bandpass filters
Easy calculation of echo sounding distance
Suggested Application  
Ultrasonic Flaw/Flow Detection
Sea-floor Mapping System, Sub-bottom Profiling System
Sidescan Sonar, Multibeam Sonar, Echosounder
Underwater Communication, Transponder
Artificial Acoustic Target Echo sounding
Fishery and Plankton Sonar: Echo-counting, Echo-integration
Target Strength Measurement, Abundance Estimate
Compensation of Sound Propagation Losses
Seafloor Scattering, Roughness, Penetration, reflection and other properties
Object Detection, Distance Measurement, Sound Velocity Profiler ...

Related Products

BII-5000 Series Power Amplifier: SONAR Transducer BII-1030 0 to 80dB Variable Gain Preamplifier (for TVG)
BII-6000 Series Impedance Matching and Tuning Unit BII-1090 0 to 60dB Programmable Gain Preamplifier
Underwater Transducer SONAR, Echosounder, Communication, Fishery ... BII-2030 Envelope Detection of Sonar Signals


TR Switch BII-2107 BII-2108
Available Bandwidth: 1kHz to 4MHz 1 kHz to 4MHz
Echo Sounding Distance: ≥0.05 m ≥0.05 m
Power Supply    
Supply Voltage: +7.5 to +60VDC +7.5 to +60VDC
Current (Quiescent): 44mA (Active); 11mA (shut down) 46mA (Active), 12mA (shut down)
Cable Length: 0.15m 0.15m
Cable Shielded Cable
Red Wire: +VDC; Black Wire: Common
Shielded Cable
Red Wire: +VDC; Black Wire: Common
Connector: Wire Leads Wire Leads
Suggested DC Supply: +9VDC Battery, Marine Battery, Automobile Battery, Fixed DC Linear Power Supply, Not Included.
DO NOT use variable power supply whose maximum supply voltage is higher than the above rated voltage.
DO NOT use switching mode DC power supply.
Signal Type: Pulsed SINE, Chirp, PSK, FSK, etc.; Pulsed Square Waveform
Maximum Voltage: 600 Vrms, customized, specify when ordering.
Maximum Current: 10 Arms
Cable Length: 0.15m
Cable Type: Wires
Connector: Wire Leads
Gain Range: 80dB (±0.3 dB Gain Error);  96dB (±1.25 dB Gain Error)
Receiving Gain: Options (Factory-Set), specify when ordering:
Low Range (LR): -22 to 58 dB (±0.3 dB Gain Error); -28 to 68 dB (±1.25 dB Gain Error).
Median Range (MR): -11 to 69 dB (±0.3 dB Gain Error); -14 to 82 dB (±1.25 dB Gain Error).
High Range (HR): 0 to 80 dB (±0.3 dB Gain Error); 0 to 96 dB (±1.25 dB Gain Error).
Input Dynamic Range: 96dB at 10kHz Bandwidth.
Band Pass Filter: 6th order, 120dB/Decade Roll-off.
To achieve lower output white noise level, bandwidth of the amplifiers should be limited. Customized -3dB bandwidth should be specified when ordering according to signal frequency and bandwidth used in your SONAR.
Gain Control:  
Signal Type: Signal Ended, DC Coupling.
Gain Control Voltage Vc: +0.4 to +2.4 VDC (80 dB Gain Range, ±0.3 dB Gain Error).
+0.1 to +2.9 VDC (96 dB Gain range, ±1.25 dB Gain Error).
Vc must be in the range: 0VDC ≤ Vc ≤ +5VDC.
Vc < 0VDC or Vc> +5VDC will damage the device permanently.
Shut-Down/Active: Active: Control Voltage Vc > 50mV.
Shut-Down: Control Voltage Vc: 0 to 50mV.
Gain Scaling: 40dB/V
Response Time: <= 0.2 μs
Cable: 0.15m Shielded Cable
Signal: White Wire; Common: Black Wire; Shield: Shielding.
Connector: Wire Leads
Echo Output: BII-2107 BII-2108
Echo Signal: Echo Waveform, AC Coupled Echo Envelope, DC Coupled
Type: Single Ended Single Ended
Cable Drive Capability: 100 m 100 m
Output Impedance: 1. Default: 10Ω
2. Custom: 50Ω
Customized by BII: 1 to 10kΩ
Frequency Dependent
Cable Length: 0.15m 0.15m
Cable: Coax, 50Ω Coax, 50Ω
Connector: 1. BNC Male (BNC)
2. Wire Leads (WL)
1. BNC Male (BNC)
2. Wire Leads (WL)
Size (Potted Unit ): ΦDxH=48x90 mm
Size (Coated PCB): LxWxH: 36x79x10 mm
Weight: 110 Grams
Operating Temperature: -40°C to 85°C
Storage Temperature: -50°C to 105°C
Technical Documents: Click BII-2100 Series wirings and Gain Control for details.

How to order:
BII-210x xx -xxx -xxx -xxx -xx -xx
TR Switch LR: -22 to 58dB
MR: -11 to 69dB
HR: 0 to 80 dB
Maximum Driving Voltage
of the Transducer
in Vrms
in kHz
in kHz
Echo Output Impedance
Blank (Default)
Custom in Ω
Echo Output Connector
Example of Part Number: Description
BII-2107LR-500-5-20-50-BNC: BII-2107, Gain Range: -22 to 58dB, 500Vrms to Transducer, 5kHz HP filter, 20kHz LP filter,  Echo Output: Impedance 50Ω, BNC Connector.
BII-2108HR-300-90-150-BNC: BII-2108, Gain Range: 0 to 80dB, 300Vrms to Transducer, 90kHz HP filter, 150kHz LP filter, Echo Output Connector BNC.

Go back to TR Switch.