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Chapter 3 - Pre-Installation Checkout
3
.1
Introduction
This chapter describes EAS 930A Multi-Module Receiver pre-installation checkout procedures. It is
recommended that the
user
perform these procedures
on
the EAS 930A on a work bench before its
final installation.
3.
2 System Operation
The unit has two front-panel controls. The AUDIO select switch is used to
se
lect the audio output
of
a
receiver for monitoring via the front panel speaker.
The
volume
of
the speaker output is adjustable via
the front pane]
VOLUME
control (Figure 2-1 ,
It
em
2).
Controls for receiver modules are edge-mounted
on
their main circuit cards. The controls are
accessible by removing the front panel access plate
of
the module.
Each receiver module has a level adjustment for its audio output (See Figure 2-5). This audio output is
routed to rear-panel terminals (See Figure 2-5), and is separate from that supplied to the front-panel
AUDIO select switch (Figure
2-1,
Item
3).
Receiver audio selected by th
is
switch is routed to the
internal speaker/amplifier for local monitoring.
3 . 3 Selection
of
Receiver Operating Frequencies
Each recei
ve
r module has one
or
more rotary switches for setting its operating frequency. These
switches are shown in Figures 3-1 thru 3-3, and are accessible by removing the receiver
's
front panel
access plate (push-on cover).
See
Item 3
of
Table 2-1 for push-
on
cover
removal instructions.
3.
3 .1 Selection
of
AM Receiver Frequency
The
AM Receiver controls and indicators accessible from the front panel are shown in Figure 3-1. The
receiv
er
operating frequency can
be
set from
540
to
1720
kHz
in 10
kHz
s
tep
s via three rotary
switches.
The
AM
receiver frequency should
be
set
to
one
of
the
two
FCC-assigned EAS stations.
RF&
AUDIO
Figure 3-1. AM Receiver Controls and Indicators
3.
3.
2 Selection of
FM
Receiver Frequency
The FM Receiver controls and indicators accessible from the front panel are shown in Figure 3-2.
The receiver operating frequen
cy
can be
se
t from 88 to 108 MHz in 100 kHz s
tep
s via three rotary
switches.
The
FM
receiver frequency should be set
to
one
of
the two
FCC
-assigned EAS stations.
RF&
AUDIO
Figure 3-2. FM Receiver Controls and Indicators
3-1
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