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4.2
ADjUSTMENTS AND CONTROLS
4.2.1
LISTENING VOLUME: The volume control knob (Fig. 1, #1) allows
adjustment of the listening volume of audio signal coming through the front-panel
speaker. Turn the volume control clockwise to increase the volume and counter-
clockwise to decrease it. If you are using a headset (the THB-14, sold separately),
the volume control knob also controls the listening volume through the headset.
4.2.2
SPEAKER ON/OFF: If you are using the optional THB-14 headset (part
no. 900298-015), you may want to turn off the front-panel speaker. This is done
with the speaker on/off switch (Fig. 1, #4).
4.2.3
CHANNEL SELECTION: The channel switch (Fig 1, #8) allows the user
to choose either Frequency A (Channel 1) or Frequency B (Channel 4). Having the
ability to select between channels is a feature useful for dive teams who have more
than one group. Note: Ensure all units are on the same channel before diving.
4.3
SQUELCH
The squelch helps suppress background noises created by sea creatures, human
activity, or other sources (e.g., snapping shrimp, croakers, motor boats, pool pumps).
Its innovative technology is unlike squelch systems used in the past: Instead of
relying simply on signal strength, it actually distinguishes between noise and voice.
The voice recognition capabilities of the SP-100D2 allow it to activate the panel
speaker with even the slightest voice in the greatest noise, such as that found on
an active reef. Therefore, the SP-100D2 squelch does not suffer the loss of range
encountered with other squelch systems, especially in high-noise environments.
The SP-100D2 squelch is fully automatic, so no adjustments are necessary.
4.4
RECEPTION
When the SP-100D2's power is activated by connecting the TCA-35 transducer
(Step 2 in Section 4.1), the unit enters the receive mode and listens for incoming
signals. Adjust the listening volume to a comfortable level (Section 4.2.1). If you
want to suppress background noises, turn on the squelch (see Section 4.3).
If you would prefer to use a headset, we offer an optional headset with boom mi-
crophone (model THB-14) that connects to the microphone jack on the SP-100D2
panel. You have the option of turning off the speaker (Section 4.2.2) while you use
the headset. The volume control knob (Fig. 1, #1) serves to adjust the headset's
listening volume. When connecting the headset, be sure the listening volume is
turned down, because the volume is much louder in the headset than through the
speaker.
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