Sigtronics EAI Operating Instructions - Manual (Page 2)

Noise attenuating, full cushion headsets, such as the
Sigtronics SE-2, or SE-40 are recommended for best results.
The EAI system incorporates an automatic headphone lim-
iting circuit to eliminate the possibility of painful spurious
radio or noise spikes from getting to the headsets and into
your ears.
Universal Radio Interface design to accommodate virtually
any type of communication radio.
Mike Output: Designed to be fully compatible with virtually
all mobile radios used on emergency vehicles. An adjustment
for transmit microphone level is provided to perfectly match
the EAI system to your particular radio. For applications where
a very high transmit microphone level is required (some Mid-
land and Wilson radios), an inexpensive plug in Mic Level
Amplifier module is available.
Automatic Sidetone Generation allows everyone on the
vehicle to hear both sides of the radio conversations.
Excellent RF Immunity guarantees clean, clear, radio com-
munications.
Standardized for use with Sigtronics single plug headsets
(ie. SE-2, SE-40, SE-41).
Model Differences: The EAI-S4 is used in applications requir-
ing up to four persons at one time on intercom and using a
single vehicle radio. The EAI-S6 is identical to the EAI-S4 but
can intercom up to six people at one time. The EAI-D4 is used
in applications requiring four intercom positions and the use
of two separate radios. Similarly, the EAI-D6 is a six place inter-
com with two radio capability.
CONTROL FUNCTIONS
ON / OFF — Power Switch — In “ON” position; supplies
power to all EAI circuits. In “OFF” position; disables all unit
functions except radio receive.
VOL — Intercom Volume — Adjusts intercom volume level.
Does not affect radio volume.
SQ — Intercom Squelch - Adjusts VOX operation of the inter-
com for variations in background noise levels.
RADIO 1 / RADIO 2 (TALK) — Transmit Select (EAI-D4 and
D6 units only) — Used to select which radio to talk on -Radio
1 or Radio 2.
AUTO / BOTH (LISTEN) — Receive Select (EAI-D4 and D6
units only) — Used to select which radio is heard. In “BOTH”
position, you hear both Radio 1 and the Radio 2. In “AUTO”
position, only the radio selected by the RADIO 1 / RADIO 2
switch is heard.
RADIO TRANSMIT MIC LEVEL — Sets the transmit mic audio
level for the radio(s).
EAI INSTALLATION
Standard Equipment Included
Besides the Intercom unit and the Radio Adapter unit, each
EAI system comes complete with the following:
EAI-S4/D4 EAI-S6/D6
Intercom Drill Template 1 1
Intercom Panel 1 1
(printed on both sides)
Intercom Control Knobs
2 2
Intercom Switch Nut 1 1
Intercom Panel Screws 2 2
Headset Jack Box 6 6
Headset Jack Box Cover
with Pre-mounted Headset Jack 4
6
with Pre-mounted Headset Jack
& Splash Cover
1 1
with Pre-mounted PTT Switch 1 1
PTT Switch with Hardware
(loose, not in boxes)
2 2
Jack Box Cover Screws 12 16
Jack Box Mounting Screws 12 16
Wire Grommets 6 8
Jack Insulator Washer, Flat 5 7
Jack Insulator Washer, Shoulder 5 7
Radio Adapter Mounting Screws 4 4
Radio Adapter Mounting Nuts 4 4
Male Connector Housing 1 1
Male Crimp Pins 13 15
Female Connector Housing 1 1
Female Crimp Pins 13 15
4 ft. Headset Jack
& PTT Switch Cable
1 1
4 ft. Radio 1/ Power
Interface Cable
1 1
4 conductor hook-up wire 1 Roll 1 Roll
4 ft. Radio 2 Interface Cable 1* 1*
Radio Select Switch Cable 1* 1*
Radio Select Panel 1* 1*
* Supplied with Dual Radio EAI-D4 and EAI-D6 units only.
INSTALLATION OVERVIEW
Sigtronics has simplified the installation process, to assure
perfect operation. Refer to the EAI Wiring Diagram (for EAI-
S4 or EAI-S6 see Figure 4 on page 6 for EAI-D4 or EAI-D6 see
Figure 5 on page 7). If you have any installation questions or
problems that are not addressed in this manual, feel free to
call our installation hot line number located on the last page
of this manual.
Installation of the Sigtronics EAI System is a five step pro-
cess:
I. Mount the intercom unit. (Intercom Chassis Installation)
II. Install the Radio Adapter unit. (Radio Adapter Chassis
Installation)
Ill. Install the headset jacks and PTT switches. (Headset Jack
and PTT Switch Installation)
IV. Wire the jacks and PTT switches. (Headset Jack and PTT
Switch Wiring)
V. Wire the radio(s). (Radio Hook Up)
2