Mobile Communications
DELTA - SX
136 - 174 MHz
RADIO COMBINATIONS
(NEGATIVE GROUND ONLY)
LBI-31564A
Maintenance Manual
LBI-31564
TABLE OF CONTENTS
MILITARY AND SYSTEM SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
COMBINATION NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
STRUCTURE D OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
INITIAL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
ILLUSTRATIONS:
Figure 1 - Typical Module Lay out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SYSTEM SPECIFICATIONS*
FREQUENCY RANGE 136-174 MHz
FREQUENCY CAPACITY 1, 8, 16 or 32 channels
CHANNEL GUARD 33 EIA Tones, 83 Digita1 Codes
FREQUENCY STABILITY ±0.0005% or optional ±0.0002%
TEMPERATURE RANGE -30C (-22F) to +60C (140E)
DUTY CYCL E 100% Receive , 20% Transmit (EIA)
BATTERY VOLTAGE
Transmit 13.4 VDC +20%
Receive 13.8 VDC +20%
BATTERY DRAIN (Maximum)
Receive
Squelched 0.7 Amperes
Unsquelched 2.2 Amperes
Transm it
40 W a tts 12.0 Amp eres at 13.6 Volts
60 W a tts 17.0 Amp eres at 13.6 Volts
110 Watts 27.0 Amp eres at 13.4 Volts
WARNING
Although the highest DC voltage in Mobile Two-Way Radio equipment is supplied by the vehicle battery, high
currents may be drawn under short circuit conditions. These currents can possibly heat objects such as tools,
rings, watchbands, etc., enou gh to cause burns. Be care ful when worki ng nea r ene r gize d circ uits!
High-level RF energy in the transmitter Power Amplifier assembly can cause RF burns upon contact. Keep away
from these circuits when the transmitter is energized!
Copyright© February 1986, General Electric Company
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SYSTEM SPECIFICATIONS* - Cont.
DIMENSION, LESS ACCE SSORIE S ( H X W X D)
40-60 Watts 65 mm X 260 mm X 325 mm
(2.5 X 10.2 X 12. 7 in ch e s)
110 Watts 65 mm X 290 mm X 325 mm
(2.5 X 11.4 X 12.7 inches)
WEIGHT, LESS ACCESSORIES
40 and 6O Watts 5.9 kg (13.0 pounds)
110 Watts 6.5 kg (14.5 pounds)
LBI-31564
TRANSMITTER
CONDUCTED SPURIOUS - 85 dB
MODULATION ± 5.0 KHz
AUDIO SENSITIVITY 60 to 120 Millivolts
AUDIO FREQUENCY Within +1 dB to -4.5 dB of a 6
CHARACTERISTICS dB/octave pre-emphasis from
300 to 3000 Hz per EIA standards.
Post limiter filter per FCC and EIA
DISTORTION Less than 2% (1000 Hz)
Less than 5% (300 to 3000 Hz)
DEVIATION SYMMETRY 0.5 kHz maximum
MAXIMUM FREQUENCY
SEPARATION
136-153 MHz 17 MHz
150.8-174 MHz 23.2 MHz
MICROPHONE LOAD IMPEDANCE600 ohms
POWER ADJUST RANGE 2:1 of rated power
RF OUTPUT IMPEDANCE 50 ohms
FM NOISE - 65 dB
CARRIER ATT ACK TIME 25 milliseconds
RECEIVER
AUDIO OUTPUT 12 Watts with less than
(to 4.0 ohm speaker) 3% distortion
SENSITIVITY
12 dB SINAD (EIA) Method 0.35 uV 0.175 uV
20 dB Quieting Method 0.50 uV 0.25 uV
Squelch <6 dB SINAD 0.25 uV 0.125 uV
Channel Guard 8 dB SINAD
ADJACENT CHANNEL SELECTIVITY
EIA Two-Signal Method
( @ 25 kHz channels) - 85 dB - 85 dB
( @ 30 kHz channels) - 95 dB - 95 dB
SPURIOUS RESPONSE - 90 dB - 90 dB
INTERMODULATION @ 25/30 kHz - 85 dB - 80 dB
MODULA TION ACCEPT ANCE ± 7.0 kHz
MAXIMUM FREQUENCY
SEPARATION
136 - 153 MHz 17 MHz
150.8 - 1 74 MHz 23.2 MHz
FREQUENCY RESPONSE Within +2 and -8 dB of a standard
Standard UHS Preamp
6 dB per octave de-emphasis curve
from 300 to 3000 Hz (1000 Hz
reference)
AUDIO ATTACK TIME 25 milliseconds
CHANNEL GUARD TX TONE <5%
DISTORTION
RF INPUT IMPEDANCE 50 ohms
HUM/NOISE RATIO
UNSQUELCHED - 55 dB
SQUELCHED - 70 dB
RECEIVER RECOVERY TIME 200 milliseconds
RECEIVER A TTACK TIME 150 milliseconds
CHANNEL SPACING 25/30 kHz
CHANNEL GUARD (Optional)
Tone 67 - 210.7 Hz ( ± 0.5%) **
Digital 023 - 526 (H) code (Standard Codes)
* These specifi cat ion s are intende d pri m ar ily for use of the se rvi cem a n. Refer to t he approp ria te Spe cif ic a tions She et for the
comple t e sp e c ifi c at ions.
** Any tone ( 67-2 10 Hz) ±0.5%
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LBI-31564
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LBI-31564
DESCRIPTION
General Electric DELTA-SX mobile radio combinations
are completely solid state utilizing microcomputer technology and integrate d circ uits to provide high qua lity - hi gh re liability radios. The DELTA-SX radio is designed for use in
vehicles having a negative ground battery system. In vehicles having a positive ground battery system a polarity converter must be used. Standard combinations may be
equippe d wit h:
• Microcomputer Control led Freque nc y Synt hesi zer
• Up to 32 channe ls
• .0002% or .0005% frequency stabilit y
• UHS Preamplifier (Ultra High Sensitivi ty) , optiona l
• Tone and/or Dig it al Channel Guard, opti onal
The radio set is housed in a weat he r resi sta nt case onl y 2
1/2 inches high. The radio is sec ured t o the vehic le b y a bot tom mounting plate, and is tamperproof when locked into
the plate. When unlocked, the handle can be pulled down
and the radio pulled out of the mounting pla te or the top
cover removed for servicing. When pulled down, the handle ca n be used t o ca r r y the radi o.
The PA board is inserted into the radio from the top of
the frame, while the TRS board is inserted from the bot tom .
There are no wire s used in the ba si c ra dio. Int er co nnections
are provided by pins on the TRS board that mate with connectors on the PA assembly. A power bus connects A+ and
A- from the front connector to the PA assembly. The PA
board is isolated from ground (floating). power is supplied
direct ly from the ba tt e ry to the PA po wer output sta ge .
The radio is of single-layer con-struction with all major
modules and tuning adjus tments easily accessible from the
top of the ra dio.
Centralized metering jacks for the transmi tter, receiver
and system functions are provided for simplified alignment
and troubl e sh oot ing .
Excluding option boards, the basic radio consists of two
printed wiring boards mounted in a cast aluminum frame.
The two boards are the transmitter-receiver-system (TRS)
board 19D901650G1 and the power amplifier board (See
Figure l). The TRS board is conne cted to chassis ground allowing it to be used in vehicles with a negative ground battery system only. Option boards include the Channel Guard
board and VG Interface board. The V G Interface board is
used in radios equipped with VOICE GUARD.
Figure 1 - Typical Module Layout
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LBI-31564
FREQUENCY SYNTHESIZER
The frequency synthesizer consists of a microcomputer,
electrically erasable PROM(S) (EEPROM), a frequency
synthesizer IC, transmit and receive VCO’s, and associated
circuitry. The frequency synthesi ze r under control o f t he mi crocomputer generates all transmit and receive RF frequencies.
EFEPROM
The EEPROM stores binary data for all RF frequencies,
Channel Guard tones/ digital codes, and the timing function
of t he carri er contr ol timer (CCT). T he micro compute r accesses the EEPROMS and provides the correct WALSH bits
to the Channel Guard board to generate the correct Channel
Guard tone or digital code on a per channel basis.
PROGRAMMING
The EEPROM allows the radio to be reprogrammed as
needed to adapt to changing system requirements. RF frequencies, Channel Guard tones and digital codes, and the
CCT func tion can be reprogrammed.
Depending on the configuration of the radio, one or two
EEPROMS may be provided. Radios not equipped with a
MODE A/B switch will have one EEPROM. Radios with
more than 16 channels and those with the MODE switch
will have two EEPROMS.
NOTE
When programming, rem ember that all RF frequencies mu st be divi sa b le by 5 or 6.25 kHz but not bot h.
The EEPROMS ca n be reprogramme d through the radio
front connector using the Genera l Ele ctric Universal PROM
Programmer Model TQ23IO. This programmer allows all
informati on t o be loa de d simul ta ne ousl y.
Alternatively, a single channel Programmer Model
4EX22A10 allows the user to reprogram the radio on a per
channel basis. This programmer requires the removal of the
radio top cover and any option boards present. A special
programming jack, J711 , is provided in the radio for interconnections.
TRANSMITTER
The transmitter consist s of the exciter, frequency synthesizer, TX VCO, and a power ampli fier a s sem bl y. The PA as sembly consists of a PA board mounted along the side of the
radio next to the heat sink assembly. The PA board also contains a hermetically sealed antenna relay and a low pass filter.
RECEIVER
The receiver consists of the frequency synthesizer, RX
VCO, inject ion amplifiers, front end, IF a nd limiter detector.
In UHS receivers, a preamplifier board is added in the receiver front end. Audio and squelch circuitry for the receiver is located in the system section of the TRS board.
Jacks for the Channel Guard and other structured options
are also located in the system area.
CONTROL UNITS
Several "S" serie s control units are avai la ble for u se wit h
the DELTA-SX, radio combin at io ns.
The S-500 control unit contains an on-off volume control switch, a rotary channel selector switch for 1, 8, or 16
channels, a MODE A/B switch (optional) to expand the
channel select capability to 32, seven segment channel indicators(s), a red transmit indicator, channel busy indicator
(optional), and an external tone option jack. Options that
may be used with this control unit include Type 90 and 99
tone, squelch operated relay SOR, GE-STAR encoder, and
public address.
The S-600 control unit contains an on-off volume control switch, squelch disable switch, red transmit indicator,
and a 7 segment channel indicator. A rotary channel select
switch permits selection of up to eight- channels. A white
power on indicator is used for back lighting the front panel.
Space is provided for two optional. pushbutton switches an d
two optional indicators.
The S-900 series control units designed specific-ally for
the DELTA class radios are highly versatile, software controlled units providing numerous functions and options including:
• Dual priority Scan
• Digita1 Volume Control
Programming instructions are provided in the respective
Programmer Ma inte nanc e Manua ls.
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• Digital Squelch Control
• Type 90 or 99 Encode Tones
• GE-STAR Identification
LBI-31564
• 128 Channels in -
8 Modes of 16 Channels each
or
4 Modes of 32 Channels each
• Carrier Control Timer (per mode basis)*
• Channel Guard - T on e o r Digit al*
• Channel Frequencies*
• Home Channe l Revert
• Auxiliary Relay Control
CHANNEL SELECTION
Depending on the control unit used a single rotary or
pushbutton selector switch will select up to 16 channels. In
radios equipped with more than 16 channels, the control
unit contains a MODE A/B switch. The MODE s witch allows the user to select a secon d set of 16 cha nne ls (17 -32) .
The MODE A/B switch may be used to provide mobileto-mobile comm unic ati on s through an interm e di at e repeater
(repeated path) or direct mobil e-to-m obile c om mu nic a ti ons.
For example: channel 1 Mode A may be programmed for
the repeater freque ncy (repeat ed path) while channel l Mode
B would be programmed for the mobile receive frequency
(direct path). Judicious programming will allow selection of
repeated or direct communications paths on selected channels.
HOOKSWITCHES
In Channel Guard or other tone applications, a microphone or handset hookswitch is supplie d wit h the ra di o. T he
hookswitches are equipped with a Channel Guard disable
switch.
Placing the switch in the "up" position (towards the
smal l s pe ak er sy mb ol) d is ab les th e Ch ann el Gu ar d de co de r.
With the switch in the "down" position, the Channel Guard
is disabled when the microphone or handset is removed
from the hookswitch.
SPEAKER
A thre e by fi ve-inc h spe ake r cont ained in a molded plas tic housing provides an audio output of 12 watts with a
speaker impedance of four ohms. The speaker leads are terminated in Vehicle Systems Plug P3 whic h conn ect s to
Jl-A on the rear of the control unit.
INITIAL ADJUSTMENT
After the radio has be e n insta l le d (a s des cr ibed in the Installation Manual), the following adjustments should be
made by a certified electronics technician.
TRANSMITTER ADJUSTMENT
MICROPHONE AND HANDSET
A hand held microphone with a built-in transistorized
microphone preamplifier is available for use with the radio .
The microphone is housed in a sturdy twopiece case, and
the extenda ble coil ed c ord plugs int o the mi cr opho ne jack at
the k of the control unit. The plu g is sec ure d t o the ja c k by a
reta ining scre w.
An optional telephone-type hand set is available for use
with the radio. The handset uses a dynamic microphone
with a built-in microphone preamplifier. The extendable
coiled cord plugs into the microphone jack on the back of
the control unit, and is secured to the jack by a retaining
screw.
* These functions are actually performed in the radio. If
you down-loa d, the data is stor ed in the control unit.
The transmitter adjustments include measuring the forward and reflected power and optimizing the antenna
length, then setting the transmitter to rated power output.
Next, measuring the frequency and modulation and recording these measurements for future reference. For the complete transmitter adjustment, refer to the Alignment
Procedure in the ser vice secti on of this manua l.
RECEIVER ADJUSTMENT
The initial adjustment for the receiver includes tuning
the input circuit to match the antenna. Refer to the Front
End Alignment Procedures in the service section of this
manual.
OPERATION
Complete operati ng instructions for the Two-Way Radio
are provided in the Operator’s Manual. The basic procedures for receiving and transmitting messages in mobile
combinations a re a s fo ll ows:
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LBI-31564
TO RECEIVE A MESSAGE
1. Turn the radio on by turning the OFF-VOLUME control
halfw ay to th e ri ght .
2. Turn the SQUELCH control clock-wise (to the right) as
far as possible. A noise will be heard from the spe ake r.
3. Adjust the VOLUME control for the desired listening
level.
4. Turn the SQUELCH control counte rclockwise to th e left
until the noi se j ust c uts of f.
5. In multi- frequency radi os, selec t the desired channel.
The radio is now operational.
TO TRANSMIT A MESSAGE
1. Tu r n the ra dio on and select the proper channel.
2. If a lengthy message (or several messages) are to be
sent, the vehicle engine should be running to maintain
the bat te ry c ha r ge.
3. Pick up the microphone and listen briefly to the speaker
to make sure that no one else is using the channel.
4. Press the push-to-Talk (PTT) switch on the microphone
and send the message. The red transmit light on the control unit will glow ea ch time the PT T swit c h is pres sed.
MAINTENANCE
The use of microcomputer technology allows self diag-
nostic mainte nanc e rout ines t o be inc orporat ed in t he m ic ro computer software. These routines are easy to run and
provide a quick analysis of microcomputer and frequency
synthesizer op eration.
The service section of this manual contains the diagnos-
tic routines, and other maintenance information to service
this radio . The ser vice section include s:
• System interconnecti ons
• Mechanic a l layout
• Disassembly procedur es
• Replacement of IC’ s c hip capac itors an d resistors
• Microcomputer self diagnost ic s
• Alignment proce dure s for t he transmitter and re c ei ve r
• Troubleshooti ng flowc ha rt s and wave for ms
Pinted in U.S.A.
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