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DESCRIPTION
Genera
I
Ill ect
ri c
Phoeni
x
mobi
Ie
combi-
na.tions
are ful1y transistored -- utilizi-ng
L.,oth di
screte components anci integrated
circujts
(IC's) for high reliab'i1ity.
The
rarJio
i
s a
sel
f-contained,
FM
transmitter/
recejver with built-in
controls and
speak-
er.
Its
sma
I
1 size makes it
idea-I for
fr:ont mounting in conventional vehicles.
The stanclarrl combinations
are
equipped with
the following:
o One receive
frequencY, and
two
transmi
t frcquencies
o
P1
ug-
j
n
crYsta
I
s
for
+0 ' 0005%
oscil lator stabi litY
o
Channel
Gr-tard
(tone
squelch)
ll'he raclio consists of an effective
hea
t-di ssipating,
aluminum die cast
rrHrr
frame on which two ci rcuit
boards
are
mountecl. The transmitter/receiver board is
mounted
on the bottom of the "H" frame
and
includes FF and receiver audio circuitry'
The Interconnect/Oscillator/Channel
Guard
(
IOC) board contai ns
a
1
I interconnections,
oscillator
circuits,
transmitter audio pro-
cessor
,
mi
crophone
preampl
ifier , and
Chan-
ne1 Guard ci
rcuitry.
Al
1 externa.l
connec-
tors, controls and indicators are
mounted
c]
irectl)'on
the two boards for rellability
anC
ease
of
di sassemblY.
\*
The hoarcls
plug into
each
other, elim-
i
na
ting the
need
for
i
nterconnecting wires.
The only wires used in the ra.dio are
the
plug-jn
leacls for the internal
speaker.
The top anr! bottom covcrs enclose the
rrHrr
frame ancl provide
optimum
protection for
the radio.
The internal speaker mounts
on
the jnside of the top
cover"
The front control panel is
made of
highly durable plastic wlth
rounded corners
and recessed controls for passenger safety
requirements.
The
panel provides
access
to
four standard operator controls:
a
POWER
crn/Off pushbutton, a momentary
MONITOR
pushbutton (fixecl squelch and
Channel
Guard
monitor), a rotary, an
edge-mounted
Volume
contr()1
, and a
two-posi
tion frequency
se-
I
ector
(RpTR-DIR)
.
A red Transmit indi-
cator t.FD (Light
Fmj
tting
Diode) and
a
green power on
indicator are provided'
No pou'er
supply is required since
the
highest supply voltage
used
in the radio js
providr.d by the vehicle battery.
The radio
i
s
de.si
gned
for operation only in 12
Vo1t,
negative
ground
vehjcle
systems.
The'radio is of modular construction.
Both major
modules
and tuning
adjustments
are
easi
1y accessiblt'.
Loosening the
two
screws
i
n thc'
rea
r of the top cover
pro-
vides access to the inte'rconnect or multi-
frequency/interconnect
board.
LI_)
1:i 10
7
2
cover provicles access to tLe
transnri
ltcr/
receiver
board.
An
optional set of test probes can
be
plugged
onto the test pins on the board for
alignment and troubleshootlng.
Illea.sure-
ments can be
made
using
GE
Test Set
4EX3A11
or a
mul-timeter,
TRANSil{
I TTER
The transmltter consists of an
FM
ex-
citer with an audio processor
and
a
broad-
band, fixed-tuned
power
amplifier.
The
RF
power
output level is pre-set lnternally
to
rated power.
Once the 1eve1 1s set,
a
sensing control circuit
holds it
constant
as temperature and/or voltage vary within
specified limits.
Frequency stability
for
both
the
transmitter and receiver is maintained
by
an electronic
compensati-on
network.
RECE
IVER
The dual conversion receiver consists
of a front end section and two mixer/IF
sections operating at 21.4
NlHz
and 455
kHz.
The receiver also contains a squelch
and
audio section.
The
audio section
provides
a 3-watt audio output into a
4-ohrn load.
AC
POV/ER
SUPPLY
OPTION
To use
the radio as a
base
station,
an
optional
121
Volt
AC, 60
llerLz
power supply
is available.
An
eight foot cable
connects
the
power supp)-y
to the radio.
The cable
length permits the
power
supply to be
1o-
cated
away
from the radio.
A green
Power
On LED
is located on the front panel of
the
power supply.
M
ICROPFIONE
The standard mobile combinations
use
an electret microphone,
The mi-crophone
is
housed
in a sturdy case,
and
the
extendable
coiled cord plugs into a jack at the
back
of the radio.
The microphone
is
secured to
the radio by
means
of a strain relief
hook
on the microphone cabIe.
A
microphone
hanger
is supplied with the
rnicrophone.
HOOKSWITCII
OPTION
1n Channel Guard appllcations,
a
microphone hookswitch may
be suppli.ed
wi-th
the radio.
The
hookswitch is equipped with
a
Channel Guard
disable switch,
Placing
the
switch
in
the
"up"
position (towards the smaIl
speaker syrrbol)
dlsables the receive
Channel
Guard.
Iti-th
the switch in the "down" position,
the
Loosen
i
ng
the two screws in the rear of the
bottom
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