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4.
3 FM and NOAA Weather Radio Antenna Installation
The
fM
and NOAA Receivers can typically share an outdoor
VHF
antenna.
The
antenna output is
applied
to
an
FM/fV
2-way
signal
sp
litter whi
ch
is supplied with the EAS
930A.
The type
of
VHF
antenna can
be
a Radio Shack
VHF/FM
Stereo antenna, Part
No
. 15-2158
or
Part
No.
15
-2
164 for
shorter receiving distances.
The
splitter outputs are fed to the
EAS
930A
FM
and NOAA Receiver inputs.
If
an additional
FM
or
NOAA Receiver module is installed
in
the Receiver, a second signal splitter may be inserted
in
one
leg
of
the first
sp
litter output
to
provide three RF connections to the Receiver.
4 . 4 AM Antenna Installation
In
high
or
moderate signal strength areas, the
AM
Receiver may operate satisfactorily using the indoor
loop antenna supplied with the
EAS 930A.
In
weaker signal strength areas,
an
outdoor antenna may
be required. An end-fed long-wire antenna (approximately 250 ft.) can
be
used
with
good
re
sults.
One
end
of
the long wire should
be
connected at the rear panel
AM
Receiver module's
RF
INPUT.
4 . 5 Received Signal Strength Indication (RSSI)
Test Point
TPl
locat
ed
next to the frequency selection switches
on
each receiver module is the RSSI
voltage
of
the receiver.
The
characteristics
of
the
RSSI
vs.
the
RF
signal level
at
the input
of
the
receiver is s
hown
in Figures
4-2
,
4-3
, and
4-4
for the
FM
, NOAA
Weather
, and AM
Re
ceiver,
respectively.
40V
.....
..,,.
....,
...,,
...,
,
...
,o_v
IOlfV
100pY
200.,rt'
2.,V
101,N
IOIN
10011"
2001,N
10t,aV
ZOpV
1GID.,
V
RF INPIIT
AT
Jl
RF
INPIIT
AT
J1 RF
INPUT
AT
Jl
Figure 4-2 Figure 4-3 Figure 4-4
FM Receiver RSSI vs.
RF
Input NOAA Recei
ve
r RSSI vs.
RF
Input
AM
Receiver RSSI vs.
RF
Input
For
reliable reception, the signal le
ve
l from the antenna feed line must
be
high enough to provide
an
RSSI voltage greater than
the
values given below.
FM Receiver
NOAA
Receiver
AM
Receiver
>
1.9
voe
>6.1
voe
>2.I
voe
The
LOCAUDIST
ANT
switch s
hould
be
set
to
the
DX
(Distant) position unless the RSSI exceeds the
values given below:
4-2
FM Receiver
NOAA
Receiver
AM Receiver
>3.8
VDe
>6.4
voe
>3.2
voe
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