Foreword - Furuno CH-500 Operator's Manual

FOREWORD

Congratulations on your choice of the FURUNO Searchlight Sonar CH-500, Dual Frequency
Searchlight Sonar CH-600. We are confident you will see why the FURUNO name has become
synonymous with quality and reliability.
Since 1948, FURUNO Electric Company has enjoyed an enviable reputation for innovative and
dependable marine electronics equipment. This dedication to excellence is furthered by our ex-
tensive global network of agents and dealers.
This equipment is designed and constructed to meet the rigorous demands of the marine environ-
ment. However, no machine can perform its intended function unless installed, operated and
maintained properly. Please carefully read and follow the recommended procedures for operation
and maintenance.
Features
The CH-500 is a searchlight sonar and the CH-600 is a dual-frequency searchlight sonar. These
systems consist of a display unit, a control unit, a transceiver unit and a hull unit.
The main features are:
• Multiple display modes to assist in tracking and monitoring fish schools.
• Customizable function keys for quick access to regularly used functions.
• Display of various data (such as own ship location, depth, etc.) with connection to the appropri-
ate sensors.
• The hull unit automatically raises the transducer when ship's speed exceeds the pre-set speed
(requires input of speed data).
• CH-600 can mix the echo of the high frequency and the low frequency. This is useful to identify
the small seabed fish which are difficult to identify.
Usage precautions
• If the equipment will not be used for a long time, turn the power off at the mains switchboard to
prevent battery discharge.
• If the soundome is to be operated while the ship is dry-docked, set the transmitter output power
to "minimum" from the menu. Damage to the train-tilt section may result if the soundome is op-
erated with maximum power while the ship is dry-docked.
• When the ship is dry-docked check for signs of corrosion on the soundome. Find the reason for
the corrosion and attach a zinc plate to the hull unit as an anti-corrosion measure if necessary.
Procedures to suppressing the interference
When asked to suppress the interference from other ships, perform the following procedures.
The priority to perform the following procedures is as follows.
1. Broadband fish finder or sonar.
2. Multiple frequency fish finder or sonar.
3. Single frequency fish finder or sonar.
• Change the TX frequency.
• Lower the TX power.
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