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set is within 1/2 inch of your lips). Depress the push-to-talk (PTT) button on the
side of the microphone or headset, and speak slowly. When you release the PTT
button, the SP-100D will return to the receive mode. While the SP-100D is in
transmission mode, you will not hear any received communications.
4.5
RECORDING COMMUNICATIONS
If you would like to record the communications, connect the recording device to
the "record out" jack (Fig. 1, #7). The jack accepts a male RCA phono plug.
Ensure the recorder is recording when the SP-100D is operated. All sounds out-
putted to the speaker will be recorded at "line level."
4.6
HELPFUL HINTS
• Remember that all divers are hearing noise underwater (e.g., bubbles and bio-
logical noises). Everyone communicating should speak at a moderate voice level
and a bit more slowly than normal.
• Divers should try to be in an inhalation cycle when listening to a voice message.
Doing so will help eliminate bubble noise while listening to messages.
• When talking to divers, keep in mind they have many things happening while
underwater. It is best to get the diver's attention before giving him a message.
Example: "Mark, Mark, this is topside, come in Mark." Mark would answer
back and then prepare for your message. Example: "Topside, this is Mark, go
ahead."
• When transmitting, speak slowly and in one continuous sentence. Try not to
make long sentences. It is always a good idea to have the divers repeat the
message back so you know they clearly understood your message. Remember
that listening to divers is usually easier than divers' listening to the topside
tender.
• It is important that the transducer be protected. It is designed using a material
that can break if sharply hit or impacted.
• Do not hang the transducer in a position that is blocked, and do not lay it on the
sea bottom.
• Inform the divers that if they go below a thermocline, they should inform every-
one. If possible, lower the transducer to the same depth as the divers in the
thermocline.
• If you are using the SP-100D on a vessel, always remember to pull up the trans-
ducer when moving the vessel. Many transducers have been lost when cut off by
a propeller.
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