Sigtronics S-A-F-E Installation Instructions - Manual (Page 8)

a) Find a better (less noisy) vehicle power source for the
SAFE unit. Move the SAFE red wire to another power
buss. Try not to use a power buss that also runs electrical
motors such as fans or light bars with rotating lights.
b) Move the SAFE ground connection (green wire) to
another ground point on the vehicle.
c) Install an electrical noise filter on the power line going
to the equipment causing the noise. Contact the
company that makes the offending equipment for a
recommendation on the type of filter to use.
If something does not work as described, go back over
the wiring and correct before going on. If all is well, you
can tighten all headset jacks and secure all jack box covers
with the supplied hardware. Also, tighten and secure all
PTT switches. On the SAFE unit, turn down both intercom
VOLume controls to approximately the 10 o’clock position.
IV. RADIO HOOK UP
The connection of the SAFE unit to the A/C, FM, and AUX
radios should be done by someone familiar with the radios
such as your radio installer. Referring to Figure 4, only the radio
functions are shown for the radio end of the SAFE interface
cable. Because the connector(s) used by radio manufacturers
varies widely, you will have to consult the radio manual or
manufacturer for the connector(s) used and pin assignments.
Sigtronics has extensive radio interface experience and can
assist with any question you might have concerning this or
any other aspect of the SAFE. See our installation hot line
number located on the last page of this manual.
Using the radio manuals and Figure 4, identify the correct
signal wires or connector pins to attach the respective SAFE
wires. For most radios, these connections are at the back of
the radio or radio control head. For some radios, the only
place to connect the MIC HI and LO and PTT HI and LO wires
is to the hand-held microphone connector.* It is best to wire
in such a way that the radio hand microphone can still be
used as normal. Make sure that you do not physically tie the
SAFE MIC LO and SPEAKER LO wires to the same pin on the
radio, even if they are tied together inside the radio. As in
the headset wiring, the connections between the SAFE and
radios should be soldered and insulated for reliability. Do not
use crimp type splices. Use a good quality electrical tape or
heat shrink tubing to cover the soldered connections.
* For the more popular radios of this type Sigtronics
manufactures plug in “Y” adapters to make these connections
easy. Contact your Sigtronics dealer for pricing and availability.
A/C (Radio 1) Hook Up
To keep the installation simple, hook up one radio and test
before moving on to the next. Starting with the A/C radio,
connect the six wires bundled with the “A/C (Radio 1)” label.
Once that is done you will need to adjust A/C radio transmit
microphone gain.
Radio microphone gain adjustments for both the A/C radio
and the FM radio are provided through two small holes
on the top of the SAFE unit. These adjustments set the
microphone audio level going to the radios during transmit.
The radio transmit mic gain adjustments will need to be
initially set to your particular radios. Adjustment should be
made only if the outgoing radio transmissions are reported
as weak, garbled, or noisy. The levels once set, should never
need adjustment again unless the type of radio(s) used are
changed. The following simple procedures take you through
the adjustment of these mic gain levels.
A/C Radio Mic Gain Adjustment can be made through the left
hole with a small, flat blade screwdriver. The basic adjustment
concept is simple. You will be setting the level and clarity
of outgoing radio transmissions through the SAFE unit
headsets, to match or exceed that of transmissions using the
radio’s standard hand microphone. To do this, you will need
to transmit and receive on the A/C radio to a remote station.
Arrange to have someone nearby with a radio compatible to
the radio you are using with the SAFE. Then…
1. Set the SAFE ON/OFF switch to the “ON” position. Plug a
headset into Officer 2’s jack. Make sure that the volume
control on the headset is turned up to full. (It is not
necessary to connect the FM Radio or the other headsets
for this adjustment.) Set Officer 2’s (left side) XMIT SELECT
switch to “A/C”, the BOTH/OFF/AUTO switch to “AUTO”, and
the AUX switch to “OFF”. Set the RECeive VOLume control
to the 12 o’clock position.
2. Set the headset aside for a moment. With the A/C radio’s
hand mic, transmit as normal, to the remote station.
Transmit long enough so that the receiving station can
get “calibrated” to your transmission (voice) level.
3. Put on Officer 2’s headset and position the headset
microphone as normal. Verify A/C radio reception. If OK,
use Officer 2’s PTT to transmit to your receiving party.
If receiving station reports weak transmission, use the
screwdriver to turn the A/C MIC GAIN ADJ clockwise a
small amount. If they report garbled, broken, or noisy
transmissions, turn the A/C MIC GAIN ADJ counterclockwise
a small amount. Repeat as necessary until the receiving
party reports that transmissions through the SAFE sound
as good or better then when using the A/C radio hand mic.
That’s all there is to it!
If A/C radio reception and transmission through the SAFE
unit is fine, skip down to the “FM (Radio 2) Hook Up” section.
If something does not work correctly, check the following
troubleshooting guide.
Radio Troubleshooting Guide:
First determine if the trouble occurs with the vehicle engine
running.
Vehicle Engine Off:
1. Can’t hear selected radio in headset:
page 8