GE LBI-31154 User manual

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Mobile Communications
MASTR@gdx
VEHICULARREPEATER

LB131154
TABLE OF CONTENTS
COMBINATION NOMENCLATURE..................................................
SYSTEM SPECIFICATIONS .....................................................
DESCRIPTION ...............................................................
Transmitter ..........................................................
Receiver .............................................................
System Board .........................................................
Logic Board ..........................................................
Mobile Detector (Optional) ...........................................
VEHICULAR REPEATER SYSTEM DESCRIPTION .....................................
System Operation .....................................................
Repeater Prioritizing and Operation ..................................
DELTA-S/SX and RANGR VEHICULAR REPEATER ADAPTER CABLE .....................
Description ..........................................................
Circuit Analysis .....................................................
INSTALLATION ..............................................................
Power Control and Interface Cable ................................... .
ADJUSTMENTS ...............................................................
Initial Adjustments ..................................................
Base-To-Portable Adjustments .........................................
Portable-To-Base Adjustments .........................................
OPERATION .................................................................
Mobile Radio Operation ...............................................
Automatic Operation of Vehicular Repeater System .....................
Manual Operation of Vehicular Repeater System ........................
MAINTENANCE ...............................................................
Preventive Maintenance ...............................................
Test and Troubleshooting Procedures ..................................
Disassembly ..........................................................
Mechanical Parts Breakdown ...........................................
Re-Installation ......................................................
MECHANICAL PARTS BREAKDOWN
Main Chassis .........................................................
138-174 MHz Receiver Assembly .........................................
406-512 MHz Receiver Assembly ........................................
INTERCONNECTION DIAGRAM ...................................................
SCHEMATIC DIAGRAMS
MASTR II Interface Cable ~~
.............................................
Executive II Interface Cable .........................................
DELTA-S/SX and RANGR Interface Adapter Cable .........................
OUTLINE DIAGRAM
DELTA-S/SX and RANGR Interface Adapter Cable .........................
MODIFICATION INSTRUCTIONS FOR DELTA-S/SX AND RANGR Mobiles ................
PARTS LIST ................................................................
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ILLUSTRATIONS
Figure 1 - Vehicular Repeater Radio Unit Module Layout (Typical) .......... 2
Figure 2 - Vehicular Repeater System Block Diagram ........................ 3
Figure 3 - Typical Installation in Vehicle ................................ 3
Figure 4 - Test Setup ..................................................... 7
Figure 5 - Disassembly ... ..*..................................- . ........... 11
Although the highest DC voltage in Vehicular Repeater Equipment is supplied
by the vehicle battery,
conditions.
watchbands, etc.,
energized circuits! enough to cauIruNls#._..-.,
high currents may be drawn under short circuit
These currents can possibly heat objects such as tools, rings,
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COMBINATION NOMENCLATURE
VEHICULAR REPEATER
MOBILE DETECTOR
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LB131154
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LB131154 " .
SYSTEMS SPECIFICATIONS*
FREQUENCYRANGE 138-174 MHz (KT-169-A)
406-512 MHz (KT-170-A)
INPUT VOLTAGE 13.8 VDC 220%
BATTERY DRAIN
Off 0.015 Amperes
Standby 0.450 Amperes
Repeat 0.850 Amperes ',
DIMENSIONS (H x W x D) 9.9 cml3.9 in. ‘x 34.3 cml13.5 in. x 34
cm/13.4 in.
3
WEIGHT
TEMPERATURERANGE
9 kgs/20 lbs.
-3O='C! to +6O==C
(-22'F to +140"F)
DUTY CYCLE Continuous
* These specifications are intended primarily for the use of the serviceman. Refer
to the appropriate Specifications Sheet in the applicable MAINTENANCE MANUAL for
specifications of standard units in the Vehicular Repeater System.
FCC FILING NUMBER
TRANSMITTER
KT-169-A
KT-170-A
POWEROUTPUT
300 Milliwatts
300 Milliwatts
FREQUENCYRANGE 0
138-174 MHz
406-420 MHz
450-512 MHz
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DESCRIPTION
The Vehicular Repeater System
consists of the MASTR Executive II
Vehicular Repeater Radio, a Mobile Radio,
Control Unit, a MASTR Personal Series
(PE) Portable Radio Unit with its
associated Vehicular Charger Unit and
associated power/control cables (See
Figure 2). The Vehicular Repeater System
retransmits portable-to-base and base-to-
portable transmissions to an operator,
using the PE radio, away from his
vehicle.
MASTRe Executive II Vehicular
Repeater Radio Combinations are compact,
highly reliable and ruggedly-constructed
units that are designed to meet the most
stringent requirements in the two-way
radio field. The vehicular repeater
radio unit operates in conjunction with a
MASTR II, MASTR Executive II, DELTA S/SE
or RANGR mobile radio.
The radios are fully transistorized
-- utilizing both discrete components and
integrated circuits (.IC'~s) for highest
reliability. The standard combination is
equipped with the following:
l Plug-in oscillator modules for
tO.O005% oscillator stability.
e Channel Guard (tone squelch)
decode.
l Type 90 tone encode and decode.
The combination is contained in a
"slide-rail", tamper resistant mounting
frame and is designed for trunk-mount
installations. When unlocked, the unit
can be easily pulled out of its frame for
servicing.
The Vehicular Repeater is of modular
construction and the modules may be used
interchangeably in vehicular repeater
combinations, except for strapping
arrangements required for operation in
your radio. No modifications are
required when transferring the modules
from one vehicular repeater to another.
All major modules and tuning adjustments
except for the system board, Channel
Guard and Type 90 tone modules are easily
accessible from the top of the radio (See
Figure 1).
Centralized metering jacks for the
transmitter and receiver are provided for
simplified alignment and troubleshooting.
Test points are available on the system
board.
TRANSMITTER
The transmitter consists of an
exciter board and a power amplifier/
antenna switch assembly. The PA/antenna
switch assembly mounts on a hinged heat
sink casting that swings down for easy
access. A low-pass filter mounts on the
heat sink next to the PA assembly.
RECEIVER
The receiver consists of an
oscillator/multipIier assembly (Osc/
Mult), RF assembly, Mixer/IF assembly
(MIF) and IF-Detector assembly (IF-Det.).
The audio and squelch circuitry for the
receiver is located on the system board.
SYSTEM BOARD
The system board contains the 10
Volt regulator, frequency select inter-
face, mobile squelch, repeater squelch,
mobile microphone interface, Type 90
interface, repeater CG interface and
logic board interface circuit. The board
is mounted on the underside of the radio
chassis. The system board contains test
points to monitor operation of the trans-
mitter, receiver and logic boards.
LOGIC BOARD
The logic board contains a micro-
computer which establishes repeater
priority and controls all radio transmi-
ssions between the portables and the base
station. It also provides the carrier
control timer function, courtesy beep,
and multiple priority clearing. The
board is mounted on the underside of the
radio chassis and plugs into the system
board.
MOBILE DETECTOR (Optional)
The Mobile Detector is used in dup-
lex radio systems and is mounted next to
the vehicular repeater receiver. It mon-
itors the mobile radio transmit frequency
to determine if another repeater is re-
peating portable-to-base transmissions.
If there is a portable-to-base transmis-
sion in progress, it causes the logic
board to maintain a non-priority status.
VEHICULAR REPEATER SYSTEM DESCRIPTION
The vehicular repeater radio con-
tains the control and logic circuits
necessary to transform a vehicle into a
mobile repeating station. A typical mo-
bile installation is shown in Figure 3.
The vehicular repeater is a single fre-
quency radio operating in the 138-174 MHz
or 406-512 MHz frequency range with a
low-power (300 milliwatts) transmitter.
The flexible spring antenna for the
vehicular repeater is normally located on
the trunk area of the vehicle.
1

LB131154
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VEHICULAR REPEATER SYSTEM DESCRIPTION
TOP VIEW
.TER
/lULTlPLlER
BOTTOM VIEW
REPEATER CHANI
‘GUARD MODULE UEL
Figure 1 - Veh.icular Repeater Radio Unit Module Layout, (Typical
SYSTEM
‘BOARD
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MOBILE ANTENNA
(ROOF MOUNT)
VEHICULARREPEATERSYSTEMDESCRIPTION LB131154
REPEATER
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VEHICULAR REPEATER RADIO MOBILE
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REPEATER
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P2 r7,P2
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SYSTEM BOARDSYSTEM BOARD 4c > LOGIC BOARD> LOGIC BOARD
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MOBILE I-FRED
DETECTOR EXCITER
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PAD
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JTENNA
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Figure 2 - Vehicular Repeater System Block Diagram
MOBILE RADIOMOBILE RADIO VEHICULARVEHICULAR
ANTENNAANTENNA RAEYERAEYE
PE RADIO UNITPE RADIO UNIT
B VEHICULARB VEHICULAR
CHARGER UNITCHARGER UNIT
RC-3888A
Figure 3.- Typical Installation in Vehicle
3

LB131154 VEHICULAR REPEATER SYSTEM DESCRIPTION
I NoTEI
The vehicular repeater should
not be used with gain antennas.
Also, for improved operation,
the distance between the mobile
and repeater antennas should be
maximized.
When the Vehicular Repeater System
is enabled, the mobile radio is used to
repeat transmissions to and from remate/
repeat base stations. This arrangement
permits cross-band repeat operation to
minimize interference problems and
eliminate the requirements for duplexers.
The mobile radio control unit allows
the operator to select one of up to eight
operating channels for mobile-to-base
communications.
The vehicular charger contains the
control circuitry to apply power to the
vehicular repeater radio, to enable the
Vehicular Repeater System, and to re-
charge the battery pack of the PE radio.
During normal mobile operation the PE
radio is inserted into the vehicular
charger and the REPEATER pushbutton
switch set to the "on" position. This
places the Vehicular Repeater System in a
ready condition so that removal of the PE
radio unit automatically enables the
Vehicular Repeater System.
Power is automatically applied to
recharge the battery pack when the PE
radio is inserted into the charger. The
amber LED indicator labeled CHARGE will
glow when positive contact has been made
and the green LED indicator labeled READY
will glow when the battery pack is fully
recharged.
The PE radio operates in the 138-
174 MHz or 406-512 MHz frequency range
with a medium power transmitter and using
a flexible spring antenna. A channel
selector switch permits selection of up
to 8 channels. Only one frequency chan-
nel is-,-used to communicate via the
vehicular repeater.
SYSTEM OPERATION
The Vehicular ~Repeater System
'extends the communications from a fixed
mobile (vehicle) system to a portable
communications system permitting the
vehicle operator to remain in continuous
communication with the dispatch center or
other radio system units when away from
the vehicle. There are three basic types
of operation possible when the operator
has left the vehicle with the PE radio.
One is portable-to-base operation which
uses the Vehicular Repeater System to
repeat any transmissions from the PE
radio to a remote/repeat base station for
communications with a dispatcher or to
other mobile radio units via a base 0
station repeater facility.
Another type of operation is the
base-to-portable wherein a dispatcher(s)
or other mobile radio units using a
remote/repeat base station can communi-
cate with the PE 'radio operator through
the repeat function of the Vehicular
Repeater System.
The third type of operation involves
the PE radios for portable-to-portable
communications without activating the
repeater.
In portable-to-base operation the
Vehicular Repeater System is enabled.
When the PE radio user has the channel
select switch on the designated repeater'
channel and keys the unit, the transmit-
ted signal is modulated with a Channel
Guard tone. When this CG tone is
detected by the CG decoder in the Vehi-
cular Repeater radio, the microcomputer
on the logic board keys the mobile radio
transmitter.
The Vehicular Repeater system is
interrupted when the mobile microphone is
used. When the mobile PTT switch is
operated the repeat function is disabled
and the mobile radio is used for communi-
cations. When the mobile microphone use 0
is concluded, the Vehicular Repeater
System will again be available for the
repeat function. However, since repeater
priority is random as established by
software control, an alternate repeater
system may assume priority status.
The base-to-portable operation is
the reverse of the portable-to-base
operation described above.
During these two operations all PE
radios in the area will hear each other's
transmissions directly and the repeated
reply from the base station.
The thirdtype of op-eration involves
only the PE radio units and does not
require the repeating functions of the
Vehicular Repeater System. A designated
channel not provided with the repeater CG
tone is used for direct portable-to-
portable communications. Since it does
not contain a CG tone, it cannot activate
the vehicular repeater. However, all PE
radios in the area and on the designated
channel will hear the transmissions.
Returning the PE radio to the charg-
ing insert on-&e vehicular charger auto-
matically disables the Vehicular Repeater
System. Should the PE radio not be in-
serted into the vehicular charger for 0
some reason (e.g., servicing, wearing of
4

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VEHICULAR REPEATER SYSTEM DESCRIPTION LB131154
unit, etc.) the REPEATER pushbutton
0
switch mustbe manually operated to the
"on" and "off" positions.
- The microcomputer in each vehicular
repeater utilizes a random counter to
establish priority. The counter is
started each time a condition to repeat
is detected. If no repeater begins to
repeat before the counter counts down the
repeater will begin to repeat and will
assume the priority state. All other
The counter
repeaters will remain quiet.
consists of a fixed 400 millisecond delay
and a random count of 1.1 seconds. Since
the value of the count is initialized
when the repeater is tuned on, each indi-
vidual repeater will have a different
delay which will change each time the
repeater is powered up.-
A Carrier Control Timer (CCT) which
resides in microcomputer software, pre-
vents system tie-ups by timing base-to-
portable transmissions. A DA jumper wire
Hl-H2 may be connected to disable the CCT
if desired.
Courtesy Beep
The Type 90 encoder is enabled for
approximately 30 milliseconds at the end
of each portable-to-base repeat transmis-
sion. This tone burst or courtesy beep
lets the portable operator know that his
radio is working and his message has been
transmitted to base. It may be desirable
to eliminate the courtesy beep in systems
using both the lQC331423 logic board and
the lQC328461 logic board. Because of
the different method used to establish
repeater priority in vehicular repeaters
using logic board lQC328461 its possible
that the courtesy beep could cause all
repeaters so equipped to count down
simultaneously the eight levels of prior-
ity. This would allow all repeaters
equipped with the lQC328461 logic board
to temporality assume priority status.
For this reason a DA-jumper wire may be
connected between H5-H6 on the lQC331423
logic board to disable the courtesy beep.
Vehicular Repeater System Enable
When a vehicle containing the Vehi-
cular Repeater system equipment arrives
at a location that requires the operator
to be away from the vehicle and get main-
tain communication, the Vehicular
Repeater System can be enabled.
Normally, the PE radio is inserted in the
vehicular charger and the REPEATER
pushbutton switch is in the "on"
position. The operator, when removing
the PE radio, automatically enables the
Vehicular Repeater System. The mobile
radio will operate on the channel
indicated by the control unit. The PE
radio channel select switch should be set
to the designated repeat channel
position.
When the PE radio is removed from
the vehicular charger unit, a switch
closure in the vehicular charger causes a
repeat enable signal to be applied to. the
logic circuitry in the vehicular repeater
radio. This, in turn, causes the vehicu-
lar repeater to transmit a 700 milli-
second burst of Type 90 tone. Since no
other Vehicular Repeater Systems have
been enabled at this time the Type 90
tone burst has no effect. At the time of
the Type 90 tone burst, the microcomputer
established the repeater as the priority
repeater.
REPEATER PRIORITIZING AND OPERATION
The vehicuiar repeater contains a
prioritizing system to prevent more than
one radio from transmitting at once.
When a repeater is enabled, it will
transmit a 700 millisecond Type 90 tone
on the portable frequency and goes into
the "priority state". In priority, the
repeater will repeat as soon as a request
to repeat is heard. A vehicular repeater
always listens ~for the Type 90 tone on
the portable frequency. If it hears the
tone, the repeater assumes that another
repeater has just been enabled and is
therefore the priority repeater. All
repeaters who hear the tone will immedi-
ately jump to the "non-priority state".
A repeater in non-priority will not
repeat immediately. It will listen for
another repeater to come up. If no other
repeater begins to repeat within a
specified time period, the non-priority
repeater will assume that there is no
priority repeater present to repeat. The
non-priority repeater will begin to
repeat and jump into the priority mode to
become the new priority repeater. The
specified time period is random and will
vary from repeater to repeater. The
random delay is between 400 ms and 1.1
seconds long. (The random clock is
loaded with a different setting each time
a request to re_peat is heard.) In a
system that is functioning correctly,
there can be any number of non-priority
repeaters, but only one repeater will be
in priority, and it will be the one doing
all of the repeating.
If the priority repeater leaves the
scene, when the next request to repeat
comes along a ehort random time delay
will occur before one of the remaining
repeaters will step up to the priority
state and start to repeat. All of the
other repeaters will remain silent, and
stay in non-priority.
The microcomputer will recognize the
following conditions as repeat require-
ments.

LBI311.54 VEHICULAR REPEATER SYSTEM DESCRIPTION
NOTE
Some condition requirements can be
duplicated by other simultaneous
transmissions. For example, an
active mobile transmitter and, a
portable-to-portable transmission.
The prioritizing system will nulli-
fy these to eliminate undue inter-
ference.
Base-to-Portable:
Mobile CAS
Mobile CAS and CG Option and Mobile CG
(with CG Option on Mobile)
Portable-to-Base:
Repeater CBS and Repeater CG
Another Repeater Repeating Base-to-
Portable
Mobile CAS and Repeater CAS
Mobile CAS and CG Option and Mobile CG
and Repeater CAS (with CG Option on
Mobile)
Another Repeater Repeating Portable-to-
Base
Mobile CAS and Repeater CAS and
Repeater CG
Monitor Option and Monitor CAS and
Repeater CAS and Repeater CG (Duplex
Mobile)
Portable Interrupt
During base-to-portable transmis-
sions, the vehicular repeater transmitter
is unkeyed for 6 milliseconds every
second to check for portable radio trans-
missions. If there is activity on the
portable radio frequency, the vehicular
repeater will immediately cease transmit-
ting. If there is a transmission with
Channel Guard tone, the vehicular repeat-
er immediately stops repeating base-to-
portable and repeats portable-to-base
VEHICULAR REPEATER ADAPTER CABLE
DESCRIPTION
The DELTA-S/SX and RANGR Vehicular
Repeater Adapter Cable allows the
DELTA-S/SX and RANGR radios to be used
with the Executive II Vehicular Repeater.
The cable contains an interface board to
convert the mobile's control leads into a
configuration that is compatible with the
control system of the vehicular repeater.
The DELTA channel select lines are coded
in 5-line binary while the vehicular
repeater channel select inputs are 1 of 8
with the selected channel input at ground
potential. The DELTA radio is capable of
32 channel operation, 16 in mode A and 16
in mode B.
The interface box (part of the
cable) detects all mode B channels,
channels 9 thru 16 of mode A, and
disables the repeater for those channels.
The repeater enable line is held
high only for channels 1 thru 8 of
mode ‘A.
CIRCUIT ANALYSIS
The interface and detection circuit
consists of a hex buffer/inverter Al,
binary-to-decimal converter U2, magnitude
comparator U3, and buffer transistors Ql
thru QS. QQ and QlO control the repeater
enable line at P2-12.
All binary inputs applied to Jl-1
thru 51-4 are buffer-ed by buffer/
inverters UlA-D and converted to decimal
1 thru 8 by -the binary-to-decimal con-
verter U2. The decimal decoder causes
one output, 01-08, to go high for each
set of binary inputs, turning the appro-
priate transistor (Ql-Q8) on. This will
ground the selected channel select line
Fl-F8 and allow the channel to become
active. The truth table shown below in
Table 1 identifies the valid binary
inputs and associated channel selected.
Jl- U2 INPUT U2 OUTPUT .CHANNEL
4321 DCBA HIGH SELECTED
1110 0001 01 Fi
1101 0010 02 F2
1100 0011 03 F3
1011 0100 04 F4
1010 0101 05 F5
1001 0110 06 F6
1000 0111 07 F7
101111000 08 F8
TABLE 1 - TRUTH TABLE
The magnitude comparator compares
the incoming bit configuration of AO-A3
against a fixed binary number, BO-B3. B3
is held high by the 5-volt regulator U4.
BO-B2 are strapped to ground for a binary
8(1000). If the binary number present on
AO-A3 exceeds 8 (1000) U3-13 goes high,
turning QQ on and inhibiting RPT ENBL.
This prevents the repeater from turning
on.
All mode B channels are identified
by FB5. When FB5 is present, inverter
UlF goes high, turning QlO on.
QlO
disables the repeater.
.
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INSTALLATION
The Vehicular Repeater radio is
installed in the same-manner as the MASTR
Executive II radi-o. A.typical installa-
tion is shown in Figure 3. Refer to the
MASTR Executive II Installation Instruc-
tions for details. _
POWERCONTROL AND INTERFACE CABLE
The Power/Control cable supplied for
the mobile radio unit should be installed
as' indicated in the Installation Instruc-
tions with the following exception:
The interface cable plug, P901, is
connected to the Mobile Radio and Jl to
the Power Control Cable. The remaining
two connectors P2 and P802 are connected
to the Vehicular Repeater and Vehicular
Charger respectively.
ADJUSTMENTS
INITIAL ADJUSTMENTS
Preliminary adjustments on the
mobile radio and the vehicular repeater
radio should be completed as indicated in
the applicable MAINTENANCE MANUALS. The
following adjustment procedures should be
LB131154
performed with the complete Vehicular.
Repeater System interconnected and power
applied. -.
The options on channels Fl through
F8 are chosen -to meet the customer's
need. If optional mobile detector is
present for non-simplex channels, certain
diodes corresponding to frequency posi-
tions where mobile detector is used are
removed from matrix CR1 through CR8. If
optional mobile CG decoder is present,
diodes are removed from matrix CR11
through CR18 corresponding to frequency
position requiring the CG decoder. Refer
to Modification Instructions in the Vehi-
cular Repeater Systems Manual.
r CAUTION
To prevent possible damage to test
equipment when connected directly
to the antenna jacks of either the
mobile radio or the vehicular re-
peater radio, directional couplers
should be used.
Connect test equipment to the
Vehicular Repeater System as shown in
Figure 4 and tune modulation deviation
meter to repeater transmit frequency.
I i
I
FREQUENCY
COUNTER
RC * 38 85A
Figure 4 - Test Setup
7

LB131154 ADJUSTMENTS
Initial Turn-On
1.
2.
3.
4.
Apply power to mobile radio by
pressing POWERswitch on control
unit to "on" position and set
Frequency Selector Switch to Fl.
APPLY power to vehicular
repeater radio by depressing
POWER switch on vehicular
charger to the "on" position.
The ON indicator should glow.
Press the REPEATER pushbutton
switch on the vehicular charger
to the "on" position. The
repeater is keyed for a short
period of time.
Verify that a short (l/2 second)
transmission is observed from
the vehicular repeater transmit-
ter as indicated on wattmeter.
The ENABLED indicator should
glow.
BASE-TO-PORTABLE ADJUSTMENTS
Type
90 Encode Modulation Adjustment
1. On Vehicular Repeater System
board connect TP3 to TP6 and
TP17 to TP8. Using the devia-
tion meter measure the Type 90
Tone deviation. Adjust R605 on
Type 90 Encode/Decode Module as
necessary to obtain 3 kHz devia-
tion. Remove jumpers.
Mobile Squelch Adjustment
Vehicular Repeater Systems board.
1. Apply an on-frequency signal
with 20 dB quieting to the
mobile radio antenna jack
(measured at 5902-4) on
Vehicular Repeater Systems
board.
2. Adjust MOB SQ ADJ control R6 on
the vehicular repeater system
board so that a voltage at test
point TP9 on the vehicular
repeater system board switches
from less than 1 volt to more
than 8 volts.
3. Observe that the vehicular
repeater keys with this 20 dB
quieting signal.
Mobile Modulation Adjustment
1.
2.
3.
4.
APPLY an on-frequency 1000 uV
signal modulated with 1000 Hz to
the vehicular repeater antenna
jack.-~-
Adjust MOB MOD ADJ control Rll
on the vehicular repeater system *
board for 23 kHz deviation on
mobile radio transmitter output.
Remove jumper from.TP17 and TP8. i
If optional Mobile Channel Guard
is present, modulate the RF
input with the proper Channel
Guard tone. Verify that the
repeater is keyed as indicated
on the wattmeter.
PORTABLE-TO-BASE
Repeater Squelch Adjustment
1.
2.
3.
4.
Connect a jumper between TP13
and TP5 on Vehicular Repeater
Systems board.
Verify that the mobile radio is
keyed.
APPLY an on-frequency 20 dB
quieting signal-to the vehicular
repeater antenna jack.
Adjust RPT SQ ADJ control R25 on
the vehicular repeater system
board so that the voltage at
test point TPlO switches from
less than 1 volt to more than 8
volts.
Repeater Modulation Adjustment
1. APPLY a 1000 uV on frequency
signal modulated with 1000 Hz to
the vehicular repeater antenna
jack.
2. Adjust RPT MOD ADJ control R3 on
vehicular repeater system board
for f3 kHz deviation.
3. Remove jumper connected between
TP13 and TP5. Verify that mo-
bile radio is unkeyed.
4. Apply an on frequency signal
with proper Channel Guard tone
to repeater antenna jack. The
mobile radio should be keyed.
5. Remove the CG and 1000 uV signal
from the RF generator. The
mobile should be unkeyed.
8

ADJUSTMENTS LB131154
6. Apply a Type 90 signal to the RF
generator.
7. Disconnect the RF Signal Genera-
tor from the repeater antenna
jack and then apply the Channel
Guard tone. The mobile radio
should key up after a short
delay (l/4 to 2 second).
Mobile Detector Squelch Adjustment
1. If the vehicular repeater is
equipped with a Mobile Detector,
select a non-simplex channel and
apply a 10 dB quieting signal on
the RF frequency to the vehicu-
lar repeater antenna jack.
2. Adjust MON SQ ADJ control R77 on
the vehicular repeater system
board so that a voltage at test
point TP18 on the vehicular
repeater system board switches
from less than 1 volt to more
more than 8 volts.
OPERATION
Complete operating instructions for
the Two-Way Radio equipment are provided
in the separate Operating Manuals. The
basic procedures for receiving and trans-
mitting messages and enabling the vehicu-
lar repeater are as follows:
MOBILE RADIO OPERATION
r NOTE
A PE radio should be inserted
into the vehicular charger or
the REPEATER pushbutton switch
be in the "off" position when
the operator is in the vehicle.
To Receive A Message
1.
2.
3.
4.
The
Turn on the mobile radio by
pressing the POWERswitch to the
"on" position. The power on
indicator will glow.
Turn the SQUELCH control (if
present) clockwise (to the
right) as far as possible.
Adjust the VOLUME control until
the noise is easily heard, but
is not annoyingly loud.
Now, slowly turn the SQUELCH
control counterclockwise (to the
left) until the noise just fades
out.
mobile radio is now ready to
receive messages from other radios in the
communication system.
To Transmit A Message
1. Turn the mobile radio on.
2. Remove the microphone from the
hookswitch and press the push-
to-talk (PTT) button on the
microphone. Speak across the
face of the microphone in a
normal voice. The red transmit
indicator on the control unit
will glow each time the micro-
phone PTT button- is pressed,
indicating that the mobile radio
transmitter is operating.
Re-
lease the microphone PTT button
to receive messages.
The mobile radio should be used
~ziiG-Lq
AUTOMATIC OPERATION OF VEHICULAR REPEATER
SYSTEMS
To Turn On Vehicular Repeater System
1.
Turn on the mobile radio and
select the repeater channel.
2. Apply power to the vehicular
repeater radio by pressing the
POWER switch on the vehicular
charger to ON. The ON indicator
will glow.
3. Depress the REPEATER ENABLE
pushbutton switch to the "on"
position.
To Enable Vehicular Repeater System
1. Turn on the Vehicular Repeater
System.
2. Remove the PE radio from the
vehicular charger by unlocking
the release button, if required,
and pressing in on the release
button.
3. The ENABLED indicator will glow
indicating that the Vehicular
Repeater System has been enabled
for communications away from the
vehicle.
9

LB131154 OPERATION
4. Turn on and adjust PE radio as
directed in the MASTR PE Series
Operating Manual.
5. The channel select switch on the
PE radio should be set to the
repeater channel.
The Vehicular Repeater System is now
operational and will retransmit between
the base station and portable radio.
To Disable Vehicular Repeater System
1. Turn off the PE radio and
reinsert it into the vehicular
charger charging insert.
2. The ENABLED indicator will go
out and the Vehicular Repeater
system is disabled.
To Turn OFF Vehicular Repeater System
1. Press the REPEATER pushbutton
switch to the "off" position.
2. Press the POWER switch on the
vehicular charger unit to the
"Off" position. The ON indi-
tor will go out.
MANUAL OPERATION OF VEHICULAR REPEATER
SYSTEM
Normally, the PE radio is inserted
into the vehicular charger unit and the
REPEATER pushbutton switch is in the "on"
position. However, should these PE radio
unit have been removed for some reason
(e-g., servicing, wearing of unit, etc.),
the REPEATER pushbutton switch must be
manually operated to the "on" and "off"
positions. With the PE radio removed and
Vehicular Repeater ~System not required,
the REPEATER pushbutton switch must be in
the "off" position to minimize interfer-
ence and allow other Vehicular Repeater
Systems in the immediate area to operate.
1. Turn on the mobile radio and
select the assigned channel.
2. Apply power to the Vehicular
repeater by pressing the POWER
switch on the vehicular charger
to the "on" position. The ON
indicator will glow.
3. Depress the REPEATER ENABLE
pushbutton switch to the "on"
position. The ENABLE indicator
will glow indicating the Vehi- ~~
cular Repeater System is opera-
tional. i
4. When Vehicular Repeater System
operation is no longer required,
the REPEATER pushbutton switch l
must be in the "off" position. .
The ENABLE indicator will go
out. ~27
‘A vehicle operator returning to the
vehicle and not returning the PE unit to
the vehicular charger unit must depress
the REPEATER pushbutton switch to disable
the Vehicular Repeater System. Failure
to do so will cause a delay in another
Vehicular Repeater System from assuming
the priority state and possibly causing
interference -with existing or future
communications traffic.
Repeater System operation is no
I I
MAINTENANCE
REMOVING IC'S (and all other
soldered-in components) can be easily
accomplished by using a de-soldering tool
such as a SOLDA-PULLTe ore equivalent. To
remove an IC, heat each lead separately
on the solder side and remove the old
solder with the de-soldering tool.
I CAUT1oN
The CMOS Integrated Circuit
devices used in this equipment can
be destroyed by static discharges.
Before handling one of these
devices, the serviceman should
discharge himself by touching the
case of a bench test instrument
that has a 3-prong power cord
connected to an outlet with a
known good earth ground. When
soldering or de-soldering a CMOS
device, the soldering iron should
also have a 3-prong power cord
connected to an outlet with a
known good earth ground or a
battery-operated soldering iron
should be used.
e
10

PREVENTIVE MAINTENANCE
To insure high operating efficiency
and to prevent mechanical and electrical
failures from interrupting system opera-
tions, routine checks should be made of
all mechanical and electrical parts at
regular intervals. Preventive mainten-
ance should include the checks as listed
in the table of Maintenance Checks.
TEST AND TROUBLESHOOTINGPROCEDURES
The individual Maintenance Manual
for the transmitter and receiver describe
standard test procedures which the ser-
viceman can use to compare the actual
performance of the transmitter or
receiver against the specifications of
the unit when shipped from the factory.
In addition, specific troubleshooting
procedures are available to assist the
serviceman in troubleshooting the
transmitter and receiver.
DISASSEMBLY
To gain access to the unit for
servicing:
MOUNTING
FRAME
\ LOCK
MAINTENANCE LB131154
1. Unlock the radio (See Figure 5).
2.
Loosen the two captive screws
shown in Figure 5.
3.
Pull the radio forward about two
inches out of the mounting
frame, and lift off top cover.
4.
To gain access to the bottom
side, pull the radio all the way
out of mounting frame.
MECHANICAL PARTS BREAKDOWN
A mechanical parts breakdown diagram
of the vehicular repeater is provided in
this manual. The diagram shows the
placement and GE Part Number of mechani-
cal items (See Table of Contents).
RE-INSTALLATION
If the mobile combination is ever
moved to a different vehicle, always
check the battery polarity of the new
system.
TOP COVER
\
CAPTIVE
SCREW
Figure 5 - Disassembly
CAPT-IVE
SCREW
Ericsson GE Mobile Communications Inc.
Mountain View Road *Lynchburg,Virginia 24502
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MECHANICALPARTS BREAKDOWN
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Issue 1 13

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