Sigtronics EAI Operating Instructions - Manual (Page 3)

I. INTERCOM CHASSIS INSTALLATION
Intercom Placement:
There are a few factors to consider when selecting a mount-
ing location for the EAI Intercom chassis unit:
1. The unit should be placed in such a way that its controls
can be easily seen and operated. Most commonly, this will
be near the vehicle’s communication radio controls.
2. The Intercom unit is primarily designed to be panel or dash
mounted. Above and below dash mounting, however, can
be accomplished by fabricating an inexpensive bracket.
3. The intercom unit has been designed to mount either
horizontally or vertically. The printed panel is reversible
for this purpose.
4. The location selected requires a minimum front panel area
of 2 1/2˝ by 1 1/16˝.
5. The intercom unit normally mounts though the panel or
dash. The maximum allowable panel thickness is 5/32 of
an inch. If the panel is thicker than this, the volume and
squelch knobs will not attach on the unit.
6. The depth required behind panel is 4 3/16˝, plus cable
access. Verify that the rear of intercom unit and cable will
not interfere with the normal operation of any vehicle
controls or the operation of vehicle compartment doors.
7. The Radio Adapter part of the EAI system plugs into the
intercom unit. Therefore, they are usually mounted near
each other. If necessary, however, an extension between
the two units can be fabricated. Connectors for this are
included with the system.
8. For dual radio systems (EAI-D4 or EAI-D6), allow for an addi-
tional panel space of 1˝ x 1-1/2˝ near the Intercom unit for
the radio selection switches.
Panel Preparation:
1. Once the location is selected, remove the protective paper
from the back of the adhesive drill template. Then stick it
down on the vehicle dash or panel in the selected area.
2. Center punch each hole at the cross lines. (The five holes
are in straight line and equally spaced 0.4˝ apart).
3. Drill 1/8˝ pilot hole at all five places.
4. Enlarge ON / OFF switch hole to 1/4˝ and the volume and
squelch control holes to 3/8˝ per template.
Mounting Intercom Unit: See Figure 1
1. Remove the nut from the Intercom unit ON / OFF switch.
2. Remove the two small black Phillips head screws (#4-40)
located on either side of the ON / OFF switch.
3. Remove both knobs from the Volume and Squelch controls
using a standard .050˝ Allen wrench. CAUTION: DO NOT
REMOVE the nuts from the Volume and Squelch controls.
4. Insert the Intercom unit from the rear of panel. Arrows on
the top and side of the intercom unit chassis indicate which
way is up. One for horizontal mounting and the other for
vertical.
5. Install the printed Intercom panel and lightly thread on
the ON / OFF switch nut. The nuts on Volume and Squelch
controls should fit inside the drilled 3/8˝ diameter holes.
6. Reinstall and tighten the two small black screws through
the holes in intercom panel. Tighten ON / OFF switch nut.
7. Turn both Volume and Squelch controls fully clockwise.
Reinstall the knobs on Volume and Squelch control shafts.
Without moving the control shafts, align the white line on
the knobs to the five o’clock position. Tighten with the
Allen wrench.
II. RADIO ADAPTER CHASSIS INSTALLATION
Placement:
The Radio Adapter part of the EAI system is designed to
be remote mounted (behind the dash) with four screws
mounted through the grommets on the back of the chas-
sis. Because the Adapter connects to the radio(s), select a
mounting location near the emergency radio controls. Also,
if space allows, mounting this Adapter within a few inches of
the Intercom unit allows connectors P1 and J1 to be mated
directly. An extension can be fabricated if necessary to con-
nect the two together.
Make sure that the transmit mic level adjustment hole(s) on
the side of the Radio Adapter chassis can be easily accessed
for adjustment with the Adapter in place. As usual, with the
Adapter in place, it or its cables should not interfere with the
normal operation of the vehicle.
Mounting Radio Adapter Chassis:
1. Remove the four corner panel screws (the smaller ones)
from the top of the Adapter unit. Remove the unit from
the chassis.
2. Set the Adapter chassis in the intended mounting place.
Using a small point pen or marker, mark the hole pattern
through the four grommets located on the bottom of the
Adapter chassis.
3. Drill four holes using a 5/32 inch drill (clearance for a 6-32
screw).
4. Secure the Adapter chassis to the vehicle using the four
screws and locking nuts supplied. Be sure to install the
screws with the screw heads inside the Adapter chassis.
This should assure that these mounting screws will not
touch the Adapter circuit board when in place. Do not
tighten the nuts and screws so tight as to excessively crush
the grommets.
3
INTERCOM
PANEL
4–40 SCREWS
FIGURE 1 VEHICLE
PANEL
SWITCH
NUT
INTERCOM
DO NOT REMOVE
THESE NUTS
KNOB
KNOB