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Watch the FINE signal scale for signs of a strengthening signal. Once the signal strength rises
above the EMI, the Signal Strength Meter should be used primarily to determine the directional
bearing to the transmitter.
Depending on whether a search is conducted on land or sea determines the search pattern. On
water, the pattern is methodical, beginning up current working towards the opposite end of the
search area. On land, drive the perimeter of the search area, stopping periodically to sweep the
horizon with the Vecta
Figure 9
Follow the strengthening signal. If it starts to fall or weaken, STOP! Slowly move the Vecta
circle to clearly establish the strongest signal direction.
A cross-directional search pattern is useful when
there are a lot of false signals. Start the search
heading in a straight line until the signal weakens
(A). Stop, and take a signal strength reading at 90°
from the current heading (B). Choose the stronger
signal (C). Continue in that direction until the
BEACON is found (D), or the signal becomes
weak. Repeat the process crossing the straight
path at 90° intervals when the signal starts to
weaken. Move in a straight line as the Signal
Strength Meter strengthens. Do not deviate from
the straight-line course as long as the signal is
strengthening (see figure 10).
Stop at the instance the signal peaks and starts to
weaken. The BEACON will be laying close to a line perpendicular to your current course. Take
signal strength readings at 90° angles from your current straight line course and heading and try to
determine if the signal is stronger in one direction or another. Turn exactly 90° and repeat the first
step of walking in a straight line as long as the signal strengthens, stopping as soon as it begins to
fall. If for some reason you have chosen the wrong direction the signal will begin to weaken
steadily from the moment you turn and start moving. If signal meter shows the signal is weakening
turn around and work in the reverse direction.
.
2
Standard SAR Pattern - Move until a signal is detected.
Disconnect the Vecta
Sweep the horizon to establish a directional bearing to the
BEACON. Once the direction is determined, continue
towards the BEACON. If the signal becomes weak or
disappears, return to the last known location with a signal
and take a new bearing. This type of search pattern is
preferable for aquatic based searches, where the terrain is
considered flat and there is little concern for reflected signals
from objects.
from the omni-directional antenna.
2
D
C
9
A
B
Figure 10
Y1-03-0227 Rev. A2
in a
2
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