2.2.2.1 Tone/Recall Mode: For tone transmission, move the “TONE/RECALL”
switch (Fig. 1, #14) either right for intermittent tone or left for continuous tone. The
tone/recall LED (Fig. 1, #4) illuminates green when the DRS-100 is in intermittent
tone mode and red when in continuous tone mode.
Note: The volume control knobs do not affect the volume when using the tone/
recall feature. Transmit volume control is used to control the volume only when
in PTT or hand-held microphone mode. Tone/recall mode automatically puts full
power to the transducer.
2.2.2.2 Voice Communication: For voice communication to divers or swimmers,
set the transmitter volume (Fig. 1, #17) to about half volume. If you will use a
hand-held microphone (e.g., the HSM-10) with a push-to-talk (PTT) switch, insert
the microphone connector into the jack (Fig. 1, #15), depress the PTT button, and
talk into the microphone. Otherwise, press and hold the PTT switch (Fig. 1, #16)
and talk into the front-panel speaker (Fig. 1, #12). To increase the transmission
volume, rotate the transmit volume control (Fig. 1, #17) clockwise. Release the
PTT button when you have nished transmitting.
2.2.2.3 External Audio: To transmit audio from an external source, connect an
RCA plug leading from the source to the DRS-100’s “line-in” jack (Fig. 1, #11).
Note:
• When a standard line-out source is connected to the “line-in” jack, the transmit-
ter activates. If your sound source has no DC path to ground (DRS-100 chassis
ground) via the output circuit of your device, you may need an adapter (OTS p/n
914024-000). Additionally, be careful not to allow salts, water, minerals, etc. to
build up around this jack, because they could cause the transmitter to activate
due to electrical conduction at the jack.
• The line input connection will accommodate unbalanced line signals (2 V
PP
at
600 ohms). Any source level similar to this is suitable for driving the DRS-100
line input. The source must present a DC path of at least 15 Kohms to ensure
the transmit circuit activates.
2.2.3 RECORDING: To record audio signal received from the hydrophone or
that you transmit into the water, insert a male RCA plug into the record-out jack
(Fig. 1, #1). Connect the other end to your recorder’s microphone input.
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