Specifications
(see Section 3.4.2.1, VOX Adjustment). (2) When you click it three times within
two seconds, the unit switches from VOX to PTT mode.
3.4.2 TRANSMIT VOX OR PTT: When power is rst applied, the system
defaults to PTT mode. By pressing the PTT button three times within two seconds,
the system toggles between VOX and PTT modes and emits a verication tone. A
two-tone sequence indicates VOX mode, and a short tone indicates PTT mode.
3.4.2.1 VOX Adjustment: A two-turn level control is located inside the electronics
housing for adjusting the VOX sensitivity. The factory default is a one half to
middle setting, which is one full clockwise rotation. The control is a two-turn
device that puts its mid setting at one full revolution from fully counterclockwise
or clockwise. Rotating clockwise increases VOX sensitivity. A rotation of one
eighth is recommended for ne adjustments of either more or less sensitivity. The
factory setting is usually sufcient for most voices. Remember to speak close to
the microphone (less than 1/4”) at higher than normal volume.
3.4.3 CHANNELS: To change between channels A and B, open the housing,
nd the slide switch located on the electronics module, and place the switch in the
desired position. Note: Channel B (the F2 frequency) is more efcient for long-
range communication.
3.4.4 SQUELCH ADJUSTMENT: Open the housing and locate the squelch
control. A fully counterclockwise position disables the squelch. This setting is
recommended when it is critical that all communications are received. This ensures
reception of all signals, even those buried in background noise. Signals so weak that
they are marginally detectable will never un-squelch a unit. For very long-range
communication, the squelch control must be set fully counterclockwise.
If the system is operated at close range and this range will never be increased, a
setting of one-and-a-half turns clockwise is good for close-quarter environments
(SDV training operations).
3.4.5 VOLUME ADJUSTMENT: Receive (RV), side audio (ST), and intercom
(IV) volume adjustments are made inside the electronics module. See Figure 6 (in
Section 6).
3.5 REBREATHER INSTALLATION
This section provides instructions for installation of the SW-1000-SC into a rebreather
system. These instructions apply specically to the LAR V but can be adapted for
a different rebreather. Refer to Figure 3 throughout this section.
3.5.1 SYSTEM SETUP: Figure 3 illustrates the correct position of all
components.
3.5.2 TRANSCEIVER INSTALLATION: Mount the transceiver to the LAR
10