2205 System Technical and User’s Guide
Document : 0022175 Rev A Page 5
2. Overview
This 2300 vehicle contains a 2205 Tri-Frequency system designed to support three side scan frequencies
and a Quad 106kHz Sub Bottom Transducer Sonar on a single chassis which in turn is mounted within a
2000m rated pressure housing. The system can switch between any of the SS/SB frequencies without
changing hardware or re-starting SONAR.exe. The side scan array has one transmit and receive section,
respective of frequency, on each port and starboard array. The Sub-Bottom transmit section is comprised
of a quad DW-106 transducer assembly. The Sub-Bottom receiver is comprised of a single PVDF panel.
A single FSK trigger can be injected into the Starmux IV Topside to trigger a tracking beacon (if
installed).
3. Power Requirements
The system is designed to accept a nominal voltage range from 36-60Vdc with a maximum initial current
draw of 4.3A at 36Vdc. The average worst case operational current of the system is 3.05A at 36Vdc.
Cable losses between the user’s power source and the EdgeTech 2205 electronics must be accounted for
to ensure that 36-60Vdc is present at the J1 bulkhead during the peak demands at initial turn-on and when
transmitting. With all acoustic systems transmitting, the current will reach 7.0 amps at 36Vdc for a
nominal time length of 33ms (based on the longest pulse width) and a minimum range of 25m. The
system has been tested at the user’s required input voltage of 48Vdc.
EdgeTech internal power systems provide power to the system’s signal amplifiers and hotel
functions. Capacitors are used to provide on-demand power storage for the signal amplifiers. These
capacitors are re-charged quickly in order to support the variety of repetition rates available. While the
2205’s Power Supply Unit (PSU) handles the system’s power distribution and the aforementioned
capacitor charging, the user’s power system must also be able to respond to the system’s instantaneous
current demands. An external power supply, with the above average ratings, may be insufficient if it
droops during peak loads. An alternative to a larger power supply is to place an electrolytic storage
capacitor on the output of the user’s power supply to provide the instantaneous current. Typical external
capacitor values are on the order of 20,000 to 40,000uf.
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