VEMCO - VR2Tx Manual
15 March
2019
3
1.2
VR2Tx Case
The VR2Tx receiver is housed in the black plastic high pressure case. The case consists of an outer cylinder
that is removed to install the D-cell Lithium battery, and the endcap which houses the hydrophone and
connects to the plastic internal casing. When the outer cylinder is removed, the internal casing protecting the
electronics can be seen. The case dimensions are found in section 6.5.
A crucial part of the VR2Tx is the hydrophone, located at the top of the receiver. The hydrophone is similar
to a microphone – it “listens” for sounds and transfers them to the electronics inside the receiver. The
VR2Tx’s hydrophone also acts as a speaker and transmits a unique ID code at a user-set interval. This ability
to both listen and broadcast allows the VR2Tx to communicate with a VR100-200 through a transponding
hydrophone. Like all hydrophones, the VR2Tx hydrophone is a sensitive piece of equipment. Avoid striking
the hydrophone or allowing any object to impact it as damage may occur that would prevent the receiver from
detecting tags or communicating with the VR100-200.
Cable Tie Groove:
This is the second of the
two grooves.
Hydrophone:
the
receiver’s “microphone”
and most delicate part.
Attachment Hole:
This hole, which is almost
10 mm in diameter, is used with the Cable
Tie Grooves to secure the VR2Tx while it is
deployed. Section 4.1.3 has more
attachment details.
Cable Tie Groove:
These grooves (there
are two) are used to attach the VR2Tx to a
line
– see section 4.1.3.
Identification Label:
Contains product
name and number, contact information,
serial number, and important warnings.
Comm Key Hole:
Place the narrow end of the Comm Key in here to prepare for
communication. Section 2 has more information on the Comm Key.
Status Light (LED)/Release Valve:
The light flashes red or green to indicate the
receiver’s status. Section 6.2 has the full description (see also box below).
The Release Valve will open
if
the internal pressure is greater than the external
pressure (see section 8.2.2).
Never cover this valve.
Do not bump the hydrophone
or
the receiver may be damaged and
unable to detect transmitters.
No flashes =
no power
2 quick red flashes every 5 sec =
Recording Mode
1 quick red flash =
acoustic ping received
Red light on (solid) =
communicating with software
One short green flash* =
acoustic ping was transmitted
(complete list in section 6.2)
* Green flashes only occur if the transmit
feature is enabled (section 3.5).
The VR2Tx is shipped closed, as shown above. The battery may be installed in the case but
not connected. The case only needs to be opened when the battery must be connected or
replaced. Connecting the battery is explained in Section 2, along with opening and closing
the receiver case. Replacing the battery is explained in Section 5.1.
