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FIND ANY OBJECT UNDERWATER - Again and Again*
JW Fishers has added pingers and a pinger receiver to their extensive line of underwater search equipment. Pingers are acoustic devices that can be attached to, or dropped on, any underwater site and allow the site to be quickly and easily relocated. The pinger’s acoustic signal is detected by the pinger receiver, which can be carried by a diver or deployed from a boat. Some common uses for these tracking devices are; marking the location of an underwater construction site or shipwreck, tagging water monitoring instruments such as current or salinity gauges, identifying the position of a benthic habitat under study or to mark the beginning and end of a fish or trap line.
JW Fishers pingers are commercial-grade and come in two different types, the single frequency pinger and the multi-frequency pinger. The single frequency pinger (SFP-1) transmits only one frequency. The user chooses one of four transmit frequencies at the time of order and the SFP-1 frequency is set at the factory. The multi-frequency pinger (MFP-1) lets the operator select any of 60 different transmit frequencies. Using multiple pingers, with each transmitting a different frequency, allows multiple targets in the same area to be marked and individually located. The operator can change the transmit frequency of each MFP-1 at any time. Both models of pingers let the user select the number of pings per second, the amount of time each ping lasts and the output power. These parameters determine how long the pinger will operate and how far away it can be detected by the receiver. Two standard 9-volt alkaline batteries supply power for the pingers. Lithium batteries can be used to extend the operating time or for even longer operating time a larger housing that holds more batteries is available. The operator can choose either automatic start when the pinger is placed in the water or a manual start activated by a switch.
The pinger receiver (PR-1) can locate any pinger transmitting a frequency between 3 and 97 kHz. When the receiver is tuned to the desired frequency and pointed in the direction of the pinger, an audio signal is emitted from the underwater earphone and LED light bar flashes indicating the pinger has been located. A compass mounted on top of the PR-1 provides the diver with the precise heading to the target. As he approaches the pinger the audio alarm increases in volume and more LEDs are illuminated on the light bar. The PR-1 is powered by a rechargeable battery pack that will operate for 30 continuous hours. Two battery chargers are provided with the system allowing charging from either 120-volt AC supply or a 12-volt DC supply. A 220-volt charger is also available.
The pingers and pinger receiver, like all of Fishers underwater search systems, are covered by a two-year warranty. For more information on these products or a brochure on their complete line, call (800) 822-4744 or email: jwfishers@aol.com or visit the website: www.jwfishers.com
