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tape from the cover and save the tape.  Unfold and bend the boom so that it is at a 90 degree angle to the sonde.  Inspect the temperature sensor for damage.  The sensor consists of two leads with a tiny silver ball in the middle above the wire (Figure 1.9).  The two horizontal leads should be nearly perpendicular to the vertical ends of the boom.  If the leads are bent use a pencil (nothing metal) to carefully bend them back into place.

Figure 1.9—Diagram of thermistor.

Next set the transmitter frequency.  Open the flap.  There will be two wire loops—black and white.  The wires must be cut to select the proper frequency.  Table 1.1 shows the frequencies available and which wires to cut.

White Wire

Black Wire

1676

1678

1680

1682

Uncut

Uncut

X

Uncut

Cut

X

Cut

Uncut

X

Cut

Cut

X

Table 1.1—Frequency selection chart.  This chart is also found in WSOH-10, Section D-1.

Use 1680 MHz unless there is interference or a second release is required.  Anytime an additional release must be performed, a new frequency must be selected.  Cut the wires at different lengths (i.e., one short and one long) to ensure that the ends do not touch.

By now, the battery should have finished soaking.  Remove the battery from the water and proceed outside.  Try to keep the battery from dripping water because it will have acid in it.  Grasp the battery by the two narrow sides with the “TOP” label facing your

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