M6 System | V4 | Installation
Passive Hydrophone + Wideband Preamplifier
We recommend the following wiring for the installation of a passive hydrophone NC-1-05 with a
preamplifier NC-2-02.
About
The main functions of a preamplifier are:
• Allow signal filtering at 38kHz: configurable on/off
• Allow signal filtering at 50KHz: configurable on/off
• Filter signal out of 30-60KHz range: fixed
• Amplify signal in the 30-60KHz range: configurable low / high
By default the hardware configuration is: gain high and notch filters at 38 kHz and 50 kHz.
The notches are activated by two wire straps that come with the preamplifier.
Preferably install the preamplifier as close as possible to the hydrophone and put the junction box
as close as possible to the receiver.
Note: On recent versions of the preamplifier (PCBA 25-992-01 rev 03 and above) high and
low gains have been reduced so that the output signal level is 12dB lower than with the
previous version. Gains are now respectively 40dB and 20dB. This improves performance by
reducing saturation with strong signals, especially in shallow waters.
Note: To be able to receive water temperature from Marport hydrophones, on M3, M5 and
M6 systems connect to the NTC hydrophone input H1 or H2. On M4 system connect to the
hydrophone input 1 or 2 using an NMEA converter junction box (P/N: NC-2-TEMP).
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