GE Two Way Radio LBI 31564A User Manual

LBI-31564A  
Mobile Communications  
DELTA - SX  
136 - 174 MHz  
RADIO COMBINATIONS  
(NEGATIVE GROUND ONLY)  
Maintenance Manual  
 
LBI-31564  
SYSTEM SPECIFICATIONS* - Cont.  
DIMENSION, LESS ACCESSORIES (H X W X D)  
40-60 Watts  
65 mm X 260 mm X 325 mm  
(2.5 X 10.2 X 12.7 inches)  
65 mm X 290 mm X 325 mm  
(2.5 X 11.4 X 12.7 inches)  
110 Watts  
WEIGHT, LESS ACCESSORIES  
40 and 6O Watts  
5.9 kg (13.0 pounds)  
6.5 kg (14.5 pounds)  
110 Watts  
TRANSMITTER  
RECEIVER  
CONDUCTED SPURIOUS  
MODULATION  
- 85 dB  
AUDIO OUTPUT  
12 Watts with less than  
3% distortion  
(to 4.0 ohm speaker)  
± 5.0 KHz  
SENSITIVITY  
Standard  
UHS Preamp  
AUDIO SENSITIVITY  
60 to 120 Millivolts  
12 dB SINAD (EIA) Method  
20 dB Quieting Method  
Squelch <6 dB SINAD  
0.35 uV  
0.50 uV  
0.25 uV  
0.175 uV  
0.25 uV  
0.125 uV  
AUDIO FREQUENCY  
CHARACTERISTICS  
Within +1 dB to -4.5 dB of a 6  
dB/octave pre-emphasis from  
300 to 3000 Hz per EIA standards.  
Post limiter filter per FCC and EIA  
Channel Guard 8 dB SINAD  
ADJACENT CHANNEL SELECTIVITY  
EIA Two-Signal Method  
DISTORTION  
Less than 2% (1000 Hz)  
Less than 5% (300 to 3000 Hz)  
( @ 25 kHz channels)  
( @ 30 kHz channels)  
- 85 dB  
- 95 dB  
- 85 dB  
- 95 dB  
DEVIATION SYMMETRY  
0.5 kHz maximum  
SPURIOUS RESPONSE  
- 90 dB  
- 90 dB  
- 80 dB  
MAXIMUM FREQUENCY  
SEPARATION  
INTERMODULATION @ 25/30 kHz - 85 dB  
136-153 MHz  
17 MHz  
150.8-174 MHz  
23.2 MHz  
MODULATION ACCEPTANCE  
± 7.0 kHz  
MICROPHONE LOAD IMPEDANCE600 ohms  
MAXIMUM FREQUENCY  
SEPARATION  
POWER ADJUST RANGE  
RF OUTPUT IMPEDANCE  
FM NOISE  
2:1 of rated power  
136 - 153 MHz  
150.8 - 174 MHz  
17 MHz  
23.2 MHz  
50 ohms  
FREQUENCY RESPONSE  
Within +2 and -8 dB of a standard  
6 dB per octave de-emphasis curve  
from 300 to 3000 Hz (1000 Hz  
reference)  
- 65 dB  
CARRIER ATTACK TIME  
AUDIO ATTACK TIME  
25 milliseconds  
25 milliseconds  
<5%  
RF INPUT IMPEDANCE  
50 ohms  
CHANNEL GUARD TX TONE  
DISTORTION  
HUM/NOISE RATIO  
UNSQUELCHED  
SQUELCHED  
- 55 dB  
- 70 dB  
RECEIVER RECOVERY TIME  
RECEIVER ATTACK TIME  
CHANNEL SPACING  
200 milliseconds  
150 milliseconds  
25/30 kHz  
CHANNEL GUARD (Optional)  
Tone  
67 - 210.7 Hz ( ± 0.5%) **  
Digital  
023 - 526 (H) code (Standard Codes)  
* These specifications are intended primarily for use of the serviceman. Refer to the appropriate Specifications Sheet for the  
complete specifications.  
** Any tone (67-210 Hz) ±0.5%  
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LBI-31564  
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LBI-31564  
The PA board is inserted into the radio from the top of  
the frame, while the TRS board is inserted from the bottom.  
There are no wires used in the basic radio. Interconnections  
are provided by pins on the TRS board that mate with con-  
nectors 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  
directly from the battery to the PA power output stage.  
DESCRIPTION  
General Electric DELTA-SX mobile radio combinations  
are completely solid state utilizing microcomputer technol-  
ogy and integrated circuits to provide high quality - high re-  
liability radios. The DELTA-SX radio is designed for use in  
vehicles having a negative ground battery system. In vehi-  
cles having a positive ground battery system a polarity con-  
verter must be used. Standard combinations may be  
equipped with:  
The radio is of single-layer con-struction with all major  
modules and tuning adjustments easily accessible from the  
top of the radio.  
Microcomputer Control led Frequency Synthesizer  
Up to 32 channels  
Centralized metering jacks for the transmitter, receiver  
and system functions are provided for simplified alignment  
and troubleshooting.  
.0002% or .0005% frequency stability  
UHS Preamplifier (Ultra High Sensitivity), optional  
Tone and/or Digital Channel Guard, optional  
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 connected to chassis ground al-  
lowing it to be used in vehicles with a negative ground bat-  
tery system only. Option boards include the Channel Guard  
board and VG Interface board. The VG Interface board is  
used in radios equipped with VOICE GUARD.  
The radio set is housed in a weather resistant case only 2  
1/2 inches high. The radio is secured to the vehicle by 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 plate or the top  
cover removed for servicing. When pulled down, the han-  
dle can be used to carry the radio.  
Figure 1 - Typical Module Layout  
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LBI-31564  
FREQUENCY SYNTHESIZER  
TRANSMITTER  
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 synthesizer under control of the mi-  
crocomputer generates all transmit and receive RF frequen-  
cies.  
The transmitter consists of the exciter, frequency synthe-  
sizer, TX VCO, and a power amplifier assembly. 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 con-  
tains a hermetically sealed antenna relay and a low pass fil-  
ter.  
EFEPROM  
RECEIVER  
The EEPROM stores binary data for all RF frequencies,  
Channel Guard tones/ digital codes, and the timing function  
of the carrier control timer (CCT). The microcomputer ac-  
cesses 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.  
The receiver consists of the frequency synthesizer, RX  
VCO, injection amplifiers, front end, IF and limiter detector.  
In UHS receivers, a preamplifier board is added in the re-  
ceiver front end. Audio and squelch circuitry for the re-  
ceiver 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.  
PROGRAMMING  
CONTROL UNITS  
The EEPROM allows the radio to be reprogrammed as  
needed to adapt to changing system requirements. RF fre-  
quencies, Channel Guard tones and digital codes, and the  
CCT function can be reprogrammed.  
Several "S" series control units are available for use with  
the DELTA-SX, radio combinations.  
The S-500 control unit contains an on-off volume con-  
trol 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 indi-  
cators(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.  
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, remember that all RF frequen-  
cies must be divisable by 5 or 6.25 kHz but not both.  
The S-600 control unit contains an on-off volume con-  
trol 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 and  
two optional indicators.  
The EEPROMS can be reprogrammed through the radio  
front connector using the General Electric Universal PROM  
Programmer Model TQ23IO. This programmer allows all  
information to be loaded simultaneously.  
The S-900 series control units designed specific-ally for  
the DELTA class radios are highly versatile, software con-  
trolled units providing numerous functions and options in-  
cluding:  
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 inter-  
connections.  
Dual priority Scan  
Digita1 Volume Control  
Digital Squelch Control  
Type 90 or 99 Encode Tones  
GE-STAR Identification  
Programming instructions are provided in the respective  
Programmer Maintenance Manuals.  
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LBI-31564  
128 Channels in -  
8 Modes of 16 Channels each  
HOOKSWITCHES  
or  
In Channel Guard or other tone applications, a micro-  
phone or handset hookswitch is supplied with the radio. The  
hookswitches are equipped with a Channel Guard disable  
switch.  
4 Modes of 32 Channels each  
Carrier Control Timer (per mode basis)*  
Channel Guard - Tone or Digital*  
Channel Frequencies*  
Placing the switch in the "up" position (towards the  
small speaker symbol) disables the Channel Guard decoder.  
With the switch in the "down" position, the Channel Guard  
is disabled when the microphone or handset is removed  
from the hookswitch.  
Home Channel Revert  
Auxiliary Relay Control  
CHANNEL SELECTION  
SPEAKER  
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 switch al-  
lows the user to select a second set of 16 channels (17-32).  
A three by five-inch speaker contained in a molded plas-  
tic housing provides an audio output of 12 watts with a  
speaker impedance of four ohms. The speaker leads are ter-  
minated in Vehicle Systems Plug P3 which connects to  
Jl-A on the rear of the control unit.  
The MODE A/B switch may be used to provide mobile-  
to-mobile communications through an intermediate repeater  
(repeated path) or direct mobile-to-mobile communications.  
For example: channel 1 Mode A may be programmed for  
the repeater frequency (repeated 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 chan-  
nels.  
INITIALADJUSTMENT  
After the radio has been installed (as described in the In-  
stallation Manual), the following adjustments should be  
made by a certified electronics technician.  
TRANSMITTER ADJUSTMENT  
The transmitter adjustments include measuring the for-  
ward and reflected power and optimizing the antenna  
length, then setting the transmitter to rated power output.  
Next, measuring the frequency and modulation and record-  
ing these measurements for future reference. For the com-  
plete transmitter adjustment, refer to the Alignment  
Procedure in the service section of this manual.  
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 extendable coiled cord plugs into the microphone jack at  
the k of the control unit. The plug is secured to the jack by a  
retaining screw.  
RECEIVER ADJUSTMENT  
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.  
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  
*
These functions are actually performed in the radio. If  
you down-load, the data is stored in the control unit.  
Complete operating instructions for the Two-Way Radio  
are provided in the Operator’s Manual. The basic proce-  
dures for receiving and transmitting messages in mobile  
combinations are as follows:  
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LBI-31564  
TO RECEIVE A MESSAGE  
4. Press the push-to-Talk (PTT) switch on the microphone  
and send the message. The red transmit light on the con-  
trol unit will glow each time the PTT switch is pressed.  
1. Turn the radio on by turning the OFF-VOLUME control  
halfway to the right.  
2. Turn the SQUELCH control clock-wise (to the right) as  
far as possible. A noise will be heard from the speaker.  
MAINTENANCE  
3. Adjust the VOLUME control for the desired listening  
level.  
The use of microcomputer technology allows self diag-  
nostic maintenance routines to be incorporated in the micro-  
computer software. These routines are easy to run and  
provide a quick analysis of microcomputer and frequency  
synthesizer operation.  
4. Turn the SQUELCH control counterclockwise to the left  
until the noise just cuts off.  
5. In multi-frequency radios, select the desired channel.  
The radio is now operational.  
The service section of this manual contains the diagnos-  
tic routines, and other maintenance information to service  
this radio. The service section includes:  
TO TRANSMIT A MESSAGE  
System interconnections  
Mechanical layout  
1. Turn the radio on and select the proper channel.  
Disassembly procedures  
2. If a lengthy message (or several messages) are to be  
sent, the vehicle engine should be running to maintain  
the battery charge.  
Replacement of IC’s chip capacitors and resistors  
Microcomputer self diagnostics  
Alignment procedures for the transmitter and receiver  
Troubleshooting flowcharts and waveforms  
3. Pick up the microphone and listen briefly to the speaker  
to make sure that no one else is using the channel.  
Pinted in U.S.A.  
8
 

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