B-1
B.0: FAQ
Below are some frequently asked questions about the 3200-XS Sub-Bottom Profiling System. They
encompass most of the questions asked by EdgeTech customers; however, should other questions arise,
please contact E
DGETECH CUSTOMER SERVICE directly.
1. What are the tow vehicle tow cable requirements?
The tow cable must include three shielded twisted wire pairs. One set must be 18-gauge wire and
is used for the transmitted signal. The other two sets must be 20-gauge wire and are used for the
received signal, 12 VDC, common, and a spare.
2. Can a Rochester 301301 (3 core coax) armored cable be used?
A 500-meter maximum length armored cable can be used. Contact E
DGETECH CUSTOMER SERVICE
for the wiring recommendation.
3. Can you interface a 3200-XS Sub-Bottom Profiling System to a transmit/receive hull mounted
array that is customer supplied?
This can be done; however, special engineering and calibration is required for optimum results.
EdgeTech can provide these services. In short, the output impedance of the Power Amplifier in
the Deck Unit must match the input impedance of the transducer array. This match will maximize
the power to the transducers; otherwise power will be lost in the amplifier instead of being output
to the transducers.
Matching is done with a transformer with the correct turns ratio. In addition, a hydrophone has
to be temporarily placed below the transmitting transducers so that the system can be calibrated.
Based on the calibration information, the system can be tuned in such a manner as to flatten the
spectrum to improve the resolution of the records.
4. How long a tow cable can I use?
Up to a 500-meter factory-approved tow cable can be used.
5. How close to the bottom do I need to tow?
Unlike side scan sonar, it is not always necessary to tow the tow vehicle near the sea floor to get
good results. Depending on which tow vehicle is used, it is possible to get good results with
hundreds of meters of water column. Towing the tow vehicle close to the bottom reduces the
area of the sea floor insonified and therefore reduces the scattering. A focused, narrow beam also
produces better spatial resolution
6. How does the 3200-XS Sub-Bottom Profiling System interface to a navigation device?
Any available serial port can be used to interface with a NMEA standard navigation device.
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