Oceanic VT 3, Operating Manual

Page: 77 / 164

77
POSITIONING OF THE VT3
The Transmitters (TMTs) emit low frequency signals that radiate
outward in semicircular patterns that are parallel to the length
dimension of the TMT. A coiled antenna inside the VT3 receives
the signals when it is positioned within a zone parallel to or at a
45 degree angle to the TMT as illustrated on page 76.
The VT3 cannot effectively receive a signal when it is held out to
the sides of the TMT or held at distances greater than 6 feet (2
meters) in front of the TMT. Best reception is achieved when the
VT3 is within 3 feet (1 meter) of the TMT.
When installed into the high pressure ports of the Regulator First
Stages, the TMTs must be positioned so that they face horizon-
tally outward from the Tank Valves.
Link Interruption Underwater
During a dive, you may at times move the VT3 out of the signal
pattern of the TMT, resulting in a temporary interruption of the
Link signal.
An interruption lasting greater than 15 seconds will cause the
Tank Pressure value to flash, the Audible Alarm to sound, and
message TMTx > LINK > LOST to scroll (Fig. 61). The Link will
be restored within 4 seconds after the VT3 is moved back into its
correct position.
Fig. 61 - Link Interruption
Underwater