JW Fishers MLFP-1 Multi Low-Frequency Pinger

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Acoustic pingers are devices that generate acoustic signals underwater.
They are used to mark an underwater site or piece of
equipment so a returning diver, using a pinger receiver, can locate
the exact spot. Pingers are available with different transmit frequencies
so several can be deployed in the same general area
without interference from each other. The diver adjusts his pinger
receiver to the frequency of the desired pinger and the receiver
leads him directly to it. These low-frequency acoustic pingers
have a 3-6 mile range versus several thousand foot range for conventional
mid-frequency (30 - 40 kHz) pingers.

JW Fishers family of commercial grade low-frequency acoustic
pingers include both the Single Low-Frequency Pinger (SLFP-1)
and the Multi Low-Frequency Pinger (MLFP-1). The SLFP-1 is
available in 11-16 kHz in 1 kHz increments, one of which is specified
at time of order. The MLFP-1 has user selectable frequencies
from 11-16 kHz in 500 Hz increments. The operator selects
one of 11 different frequencies before deploying the pinger.

Fishers acoustic pingers are very flexible allowing the operator to
select the number of pulses per second, the length of each pulse,
and the output power. Varying the length of each pulse and output
power allow the operator to adjust the distance the pingers can be
detected. With the MLFP-1 the transmission frequency can be
selected by the operator before deployment. These features make
the pingers extremely versatile and the first choice for almost any
application.

The optional PC Software allows the operator using a laptop to
fine tune the variable settings including selecting delayed start
(from a minute to a 365 day delay start). Power for the pingers is
supplied by standard alkaline batteries which last from a few
weeks to many months, depending on output power and pulse
selection. Extended Operating Life housing and Very Long Duration
housing (hold more batteries) are available which significantly
extend the operating time.

The pinger can be automatically activated when put in water, or
manually activated on the circuit board. Fishers pingers are covered
by our 2 year exclusive UNCONDITIONAL warranty.

Technical Data:

• VERY LONG RANGE (3 to 6 miles)
• OPERATOR ADJUSTABLE OUTPUT POWER, PULSE
• WIDTH AND PULSE REPETITION RATE
• MANUAL TURN-ON OR WATER ACTIVATED
• DIFFERENT FREQUENCIES AVAILABLE
• USES STANDARD BATTERIES
• 1,000 FOOT OPERATING DEPTH
• ADDITIONAL FEATURES FOR MLFP-1
• OPERATOR SELECTABLE FREQUENCIES (11-16 kHz)
• DELAYED START (Optional)

Specifications:

MLFP-1

Frequency 11 to 16 kHz (in 500 Hz steps)

Power output (adj) 177 to 195 dB 

Pulse length (adj) 2,3,4 or 10 ms 

Pulse rep sec (adj) 1/2, 1 or 2 seconds

Batteries* twelve 9 volt**

* Alkaline or Lithium batteries can be used

** Extended Operation Housing uses twenty “D” cell batteries

*** Battery life - weeks to months depending on power option selected. Extended Operation Housing yields 7 times battery life

DIMENSIONS/WEIGHTS:

Standard Operation Housing - 4.75”D x 14.5”L - 7 lbs. air/ -4 oz. water

Extended Operation Housing - 4.75”D x 22”L - 14 lbs. air/ -2.5 lbs. water

MATERIALS/COLOR:

Housing - High impact PVC/yellow