Sigtronics S-A-F-E Operating Instructions

Sigtronics S-A-F-E Unit Operating Instructions

INSTALLER: Please give this copy of the safe unit operating

instructions to the users of the safe system.

The following describes how to use and adjust the
SAFE controls. It also explains exactly how the SAFE
unit operates. This will allow you to easily set all unit
functions to your specic needs. If you are not familiar
with the SAFE operation, perform the next few steps
while the vehicle is not in motion.

Intercom operation and adjustment can be per­formed by the following procedure:

1. Set the ON/OFF switch to the “ON” position and
turn both RECeive VOLume controls all the way
down (counter-clockwise).

2. Turn both intercom VOLume controls to the 10
o’clock position and both SQuelch controls all the
way up (clockwise). Notice the intercom is now
continually activated and you should be able to
talk between headsets.

3. To adjust the intercom SQuelch controls for voice

activated operation (VOX), it is helpful to have
some background noise present. It may also be
necessary to turn up the intercom VOLume con­trols. Turn both intercom SQuelch controls all the
way counter-clockwise. Now, without speaking,
rotate one of the SQuelch controls clockwise until
you hear the background noise in your headset.
Next, using that same SQuelch control, rotate
counter-clockwise small, incremental amounts
until the background noise disappears. (This pro­cedure is necessary because the squelch is a “fast
on, slow off” system). That SQuelch control is now
set.

4. Adjust the other intercom SQuelch control similarly
by turning it clockwise until you hear background
noise. Rotate counter-clockwise incremental
amounts until the background noise disappears.

Small adjustments may be necessary if background
noise changes signicantly - such as from idle to full
power.

Specialists in “SOUND” Management

178 East Arrow Highway, San Dimas, CA 91773 ( 909 ) 305-9399

Radio Selection of both the A/C (Radio 1) and FM
(Radio 2) radios are provided by two switches.

• Sidetone is generated and sent to your head-

phones.*

1. XMIT SELECT determines the radio you wish to
transmit on.

2. BOTH/OFF/AUTO selects which radio(s) you
receive or hear in your headset.

a) “BOTH” position permits you to hear both the

radios at the same time.

b) “OFF” position disables the hearing of either

radio.

c) “AUTO” position allows you to hear the radio

that the XMIT SELECT switch is set to.

The AUXiliary audio source is selected by the AUX/OFF
switch. In the “AUX” position, you can hear it, and in
the “OFF” position you cannot.

Receive Volume Controls (REC VOL) are general
volume controls, meant to provide overall listening
level for all three radios simultaneously - A/C radio, FM
radio, and AUXiliary radio. Finite volume adjustments
of any individual radio should be done by altering the
radio volume control at the radio itself.

Once the radios are selected, Ofcer 1 (right side) or
Ofcer 2 (left side) can transmit at any time simply
by pressing their PTT switch. The two Crew positions
cannot transmit on the radios. When one position
transmits, several things take place automatically to
the transmitting side of the SAFE unit:

• The intercom between the two sides of the SAFE unit

is turned off.

* Sidetone is a portion of the transmitted voice signal
sent back into your headset so that you can hear
what you are saying while transmitting. The RECeive
VOLume control adjusts the volume level of the
sidetone that you hear in your headset.

The non-transmitting side of the SAFE is not affected
(except for intercom) when the other side transmits.
The non-transmitting side can monitor the transmis­sions of the other side by simply selecting the same
radio on his side of the SAFE. Of course, when the PTT
switch is released, (stop transmitting) all functions
return to normal, instantly and automatically.

Simultaneous Transmit is the most attractive and
powerful feature of the SAFE. Both Ofcers 1 and 2
can transmit at the same time – either on separate
radios or on the same radio transmitter! When on
different radios, neither Ofcer position will interfere
with the other’s communications. For example, if using
the SAFE on an airport crash vehicle, Ofcer 2 can talk
to air trafc control while Ofcer 1 talks on the emer­gency dispatch radio, or visa versa. On the other hand,
they can also transmit on the same radio transmitter.
If, for example, Ofcer 1 is talking on one of the radios,
Ofcer 2 can jump right in and add to the conversation
simply by pressing his PTT switch. Both voices will be
heard by the receiving station.

NOTE: Only the A/C radio and the FM radio can be
transmitted on. The AUXiliary input is for listening
only. It can be used for listening to a scanner, moni­toring the audio portion of a video camera, listening
to background music, and many other possibilities.

• The Auxiliary audio, if selected, is muted.

• The receive audio of the radio not selected by the

XMIT SELECT switch is muted, regardless of the posi­tion of the BOTH/OFF/AUTO switch.

• If Ofcer 1 is transmitting, both Crew headset micro-

phones are muted.

• The selected radio is put into transmit mode.

• The headset microphone audio (your voice) is sent

to the selected radio.

1-8-2007 safeoper.pdf