VEMCO - VR2AR / VR2AR-X Manual
15 March 2019
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4.1.2
Spacing
Receiver spacing is generally determined based on range testing and historical acoustic data. Our position is
that you should try to space receivers such that you achieve good detection probability in most or all weather
conditions. It is not always necessary to have 100% coverage if you have several other locations where you
know the animals will be passing through. However, if you wish to accurately
quantify the passing of animals through receiver locations then you should
strive for 100% detection probability. Typical spacing is usually between 100
and 800 meters.
4.1.3
Biofouling
Some customers use a rubber shrink tape, such as DAFLEX ST250 Cold
Shrink Tape, available from Digikey (W211-ND), to prevent biofouling on
the VR2AR receiver. It can be used to cover the receiver body (Do not
cover the hydrophone) and does not leave a glue residue when removed.
Another option is to use an antifouling paint, such as Interlux Micron CSC.
When using antifouling paint, consult the manufacturer’s safety data
sheet and follow their recommended handling procedure (safety glasses,
gloves, etc.)
4.2
Mooring Line Attachment
A common method used to attach a VR2AR receiver to a mooring line is to thread the rope through one of the
holes in the float attachment bracket, wrap it around the circumference of the receiver, and up through the
other hole in the float attachment bracket, as shown below. A minimum rope size of 3/8" diameter nylon rope
is suggested.
Pass a shackle through the mooring lug and use the 3/8” diameter (minimum) rope through the shackle.
See the Gate Design
NOTE:
Keep the hydrophone uncovered to
prevent acoustic dampening.
3/8" diameter
nylon rope
(suggested minimum)
Never cover the Status
Light/Release Valve
Th
e release valve
must
be able
to pop open if needed and must
not be blocked by tape or paint.
