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Figure 1 depicts the SP-100D panel. The numbered text below is the key to the
indicated items in Figure 1. Text in all capital letters refers to the label on the
panel.
1. VOLUME:
2. Phillips pan-head
screw:
3. 12 VOLTS
4. SPEAKER switch: If a headset is to be used, the front-panel speaker can be
5. MICROPHONE:
6. XDUCER:
7. RECORD OUT:
8. SQUELCH:
9. Speaker:
SECTION 2
FUNCTIONS
Use the volume control to adjust the front-panel speaker
listening volume. The volume is increased by clockwise
rotation and decreased by counterclockwise rotation.
One of eight #8-32 Phillips pan-head front-panel screws.
These screws are removed to take off the front panel for
access to the battery holders or the electronic module.
This connector is used for an external 12-volt DC power
source. Ensure the source has a minimum of 1 amp cur-
rent. We recommend that you use the supplied double
mini banana plug (the EPP-2 external power cable).
turned off via this switch.
This receptacle is used for the HHM-3 hand-held, push-
to-talk microphone (supplied with the SP-100D).
This female bulkhead Amp connector is used for con-
nection of the 35-foot transducer cable. Ensure that the
o-ring is in place before connection. When the connec-
tion is made to the TCA-35 transducer, the unit will power
up and stay powered up until the transducer is discon-
nected. (Note: After disconnection of the transducer, there
is a 45-second delay before power is turned off.)
A recorder can be connected here. The signal level is
"line-out," suitable for most video and audio recorders.
This feature is useful for situations where documentation
is important.
The squelch control is designed to help suppress back-
ground noise due to biological or human activity (e.g.,
snapping shrimp, croakers, motor boats, pool pumps). To
activate the squelch circuit to suppress noise, toggle the
squelch switch to the on position.
The front-panel speaker for listening to communications.
3
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