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LBI-38653
Mobile Communications
MDS
440-512 MHz MOBILE RADIO
COMBINATION
TABLE OF CONT EN TS
MAIN BOARD ASSEM B LY...........................................LBI-38760
FRONT PANEL ASSEMBL Y................. ....... .... ..... ....... ..LBI-38757
POWER AMPLIFIER ASSEM BLY.................................LBI-38761
SERVICE SECTION............... .........................................LBI-38759
Maintenance Manual
Printed in U.S.A.
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LBI-38653 LBI-38653
SPECIFICATIONS
TABLE OF CONTENTS
GENERAL
Page
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
PACKAGE NUMBERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
RADIO DESCRIPTIO N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
MAIN BOARD ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
FRONT PANEL ASSEM BLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
POWER AMPLIFIER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
PC PROGRAMMABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
BATTERY POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EXTERNAL SPEAKER (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EASY ACCESSIBILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DET AILED TYPE 99 OPERATION AND PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
GE TYPE 99 FORMAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
MOTOROLA FORMAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Frequency Range Trans mit: 440-470 MHz (UHF MID SPLIT)
470-512 MHz (UHF HI SPLIT)
Receive: Same as Transmit
Channel Spacing 25 kHz
Frequency Stability ±5.0 ppm
Operating Temp er at ur e Ran ge -30 to +60°C
Battery Voltage 13.6 volts ±10% (meets specs)
±20% (operational)
Radio Current Drain OFF: 0.01 amps
RX Squelched: 0.9 amps
RX On: 1.5 amps
TX On: 10.0 amps
Size 170mm W x 216mm L x 53mm H
TRANSMITTER
TX Two Frequency Spread Full Band split
RF Power Output 40 watts min (+146 dBm)
MECHANICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
MECHANICAL PARTS BREAKDOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
FIGURES
Figure 1 - MDS Conventional Radio Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
TABLES
T a ble 1 - Channel Guard Tone Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 2 - Primary Digital and Equivalent Digital Codes (OCTA L) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 3 - Tone Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
T a ble 4 - Tone Generator Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 5 - Motorola Type Coder Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 6 - Motorola Group Call Tone Groups (TG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 7 - Motorola Group Call Tone Groups (TG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Maximum Deviation ±5% kHz peak
TX Duty Cycle 20% Intermittent (EIA)
FM Hum and Noise (EIA) -45 dBc maximum
Audio Distortion 5% @ 300 Hz, 3% @ 1 kHz, 5% @ 3 kHz
RF Load Impedance 50 ohms
Audio Sensitivity 80 mV ±3 dB
Audio Frequency Response Within +1,-3 dB of a 6 dB/octave pre-emphasis,
300-3000 Hz (EIA)
Spurious Emissions
Conducted -16.5 dBm max (Meets DOC & FCC)
Radiated -13 dBm max (FCC)
RECEIVER
Receiver coverag e 440-470 MHz, 470-512 MHz
Factory Tu ned 450-462 MHz, 470-482 MHz
RX T wo Freq Spread 12 MHz (No degradation)
Channel Spacing ±25 kHz
Copyright© February 1992, Ericsson GE Mobile Communications Inc.
Sensitivity (12 dB SINAD) - 117 dBm (.30 µV)
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LBI-38653 LBI-38653
SPEC I F IC AT I ONS ( Co n t .)
Spurious Emissions
Radiated Meets FCC requirements
Conducted -57 dBm maximum
RX Spurious Response 70 dB minimum
Adj Ch(2-Sig) Selectivity -70 dB max @ 25 kH z (E IA)
Intermodulation A ttenuati on -70 dB minimum
RX Modulatio n Accep tance ±7 kHz minimum
Audio Distortion 2% maximum @ 0.5 Watt (EIA)
10% maximum @ 4 Watts and 1 kHz
Audio Frequency Response Within +2, -8 or a 6 dB/octave de-emphases,
300-3000 Hz (EIA)
RX Hum and Noise
Unsquelched -45 dB maximum
Squelched -70 dB maximum
Audio Output Power 4 watts, @ < 10% Distortion
Speaker Impedance 4 ohms
MDS RADIO PACKAGE NUMBERS
MDS RADIO PACKAGE NUMBERS
PACKAGE NUMBER DESCRIPTION
TLU22 UHF MID-SPLIT 2 CHANNEL, 40 WATT
TLU28 UHF MID-SPLIT 8 CHANNEL, 40 WATT
TLU32 UHF HI-SPLIT 2 CHANNEL, 40 WATT
TLU38 UHF HI-SPLIT 8 CHANNEL, 40 WATT
OPTIONS
OPTION NUMBER DESCRIPTION
MC3G DESK TO P MIC
AN1R 1/4 WAVE, ROOF MT AN TENNA W/TNC CONNECTOR
ZM3L EXTERNAL WEATHERPROOF SPEAKER AND CABLE
LS1F MIL SPEC SPEAKER, 4 OHMS, 5 x 5
CD1E SPEAKER CABLE
PD1A NOISE FI LTER KIT
SU1C ALARM RELAY KIT
EC1A DOC POWER SET
MA1L DESK TOP RADIO MOUNTING W EDGE
PS1D 240 VAC-12 VDC, 13A 50/60 Hz Power Supply
PS5K 120 VAC-12 VDC, 13A 50/60 Hz Power Supply
INTRODUCTION
The Ericsson GE Co nv entional MDS Radio is a rugged
two-way FM mobile radio which operates in the 440-470
MHz and 470-512 MHz fr equen cy b ands. T he MDS is a wide
band synthesized radio utilizing microcomputer technology to
provide reliable high quality simplex two-way mobile communications. Its transmitter output power level is 40 watts over
the wide bandwidth of each split. The receiver has an allowable 12 MHz maximum receive channel separation. There are
two versions a v ai lable for each split, a 2-channel and an 8channel. The basic radio package includes the following features:
• Microprocessor Control
• Synthesized RF Channel selection (frequency control)
• 7-Segment LED Channel Display
• Multi-ton e Channel Guard (CTCSS) Enco de/ D ec o de
• Multi-code Digital Channel Guard (DCG) Encode/De-
code
• Automatic Hook Switch Channel guard Disable
• Channel Activit y S ensing (CAS)
• Carrier Control T i m e r (CCT)
• ±5 ppm frequency stability
• Talkaround, radio to radio direct Communication
• Type 99 Tone Decode
• Field Programmable with PC
• Fixed Squelch, threshold programm able
• Internal 4-watt Speaker, with volume control
• Front Mounted Microphone Connector
• Rear Mounted Antenna TNC Connector
• Rear entry power connections
• ANI Encode
The small size of the MDS radio makes it ideal for front
mounting in conventi on al ve hicles. The radio is operated with a
simple hand held microphone i n combination with the f ollowing
operating controls, all located on the front panel.
• Power ON/OFF Switch
• Channel UP/DOWN Selector
• Volume UP/DOWN Control
• Monitor Switch for Channel Guard Disable
• T ype 99 Tone RES ET Sw itch, to res et the tone de code r.
Refer to the Operator’s Manual LBI-38651 for a co mp lete
description of the operating proced ures.
RADIO DESCRIPTION
MAIN BOARD ASSEMBLY
A sturdy aluminum casting houses the Main Board Assembly (N29/85154001220 for the 440-470 MHz band
N29/85154001250 for the 470-512 MHz band). There is complete accessibility to the Main Board with the radio’s top and
bottom covers removed. Th e Main Board contains the following
circuits:
• Microprocessor and associate d Lo gic
• Frequency Synthesizer
• Tr ans mitt er Ex ci te r
• Receiv er
• Audio Processing (for both transmit an d r ecei ve p aths)
• Tone and Squelch Processing (for both transmit and
receive paths)
• Voltage Re gulat ors
Logic Circuitry
The radio’s logic circuitry includes the 80C535 microprocessor with associated EPROM a nd Ele ctrica lly E rasable PROM
(EEPROM) memory and latch circuitry. The Microprocessor
controls the functions of the transmitter, the receiver, the inputs
from the oper ato r and the outputs to the operator.
Synthesizer
A programmable Synthesizer generates both transmit and
receive operating frequencies. It includes a synthesizer chip, a
dual modulus counter, a temperature compensated reference
oscillat or ( TCXO) and a v oltag e co ntrol led o sci llator ( VCO); a ll
part of an operating phase lock loop, w ith its requisite loop filte r.
T ransmitter
The radio transmitter includes th e Synth esizer’s modulated
VCO and the fixed tuned exciter amplifiers. The exciter amplifiers are wideband, covering both splits in the UHF band without
retuning. The exciter output is fed to the Power Amplifier Board
through a coax cable. The exciter provides 35 dB of gai n to drive
the Power Ampli fier with 3 watts. Th e tra nsmitte r output level
at the antenna connector is factory set for a rated output power
of 40 watts. The power control circuit detects the power output
of the Power Amplifier. Using the er ror sign al, the power co ntrol
circuit varies the DC supply voltage to the first stage of the
exciter. This will hold the transmitter output level constant.
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LBI-38653 LBI-38653
Receiver
The RF front end of the rece iver includes the PIN diode T/ R
switch, the tuned band pass preselector filters, and the low noise
RF amplifier. The filters have a 12 MHz bandwidth, and are tuned
for the specific sp lit in either of the tw o UHF Bands. The recei ver
is factory tuned to 450-462 MHz or 470-482 MHZ. Refer to the
Service Section LBI-38759 for retuning to a different f requency.
The first mixer (with its low side injection from the VCO)
generates a 45.000 MHz IF signal which is filtered with monolithic crystal filters having a 15 k H z b andwidth. A 455 kHz low
IF circuit module co ntains the seco nd local oscillato r, the seco nd
mixer with low side injection, external ceramic filters, an external 44.545 M Hz crystal for t he os cillat or and t he FM quadra ture
detector circuit.
T ransmit Audio P rocessing
In the transmit audio path, the audio from the microphone
is passed through a 3 kHz low pas s filter, pre-emphasized and
hard limited for a maximum modulation peak deviation of 4.5
kHz. A MIC Mute switch is controlled by t he logic as appropria te
for tone or voice modulation of the transmitter. Channel Guard
tones and the A.N .I. signal from the mic roprocessor ar e summed
into the audio path before the gain control. Next, a 3 kHz post
limiter low pass filter attenuates frequenc ies above 20 kHz by
more than 54 dB before passing the audio signal on to the
modulation input of the VCO.
Receive Audio Processing
Audio from the demodulator enters the voice path through
a 300 Hz h igh pass filter, followed by a 3 kHz low pass filt e r. A
"Receive Mute" switch is provided so the voice signal can be
muted by the micropr ocessor when it sums it s Alert tones into
the path. The "Receive Mute " switc h attenuat es the voice a udio
by 50 dB when t he Alert tones are sum med into the path. The
path is comp leted with a gain control, and a logic contr olled
switch for speaker muting while transmitting. The audio power
amplifier which delivers 4 watts to the speaker is connected on
the Main Board, but is mounted on the aluminum chassis for heat
sinking.
Tone And Squelch Processing
The Channel Guard path includes a 220 Hz low pass filter
for passing the received Channel Guard tones without audio. A
tone limiter insures a 5 volt pp maximum input tone level to the
microprocessor.
In the Squelch path, noise above the au dio voice frequencies
is filtered through a 6 kHz high pass filter; amplified and then
limited. A DC Detector generates a DC voltage re pr esenting the
amplitude of the noise. This DC voltage is applied to a comparator. The output from the comp arator is fed to the micr oprocesso r. The microprocessor squelch es the receiver under conditions
of high noi s e and absence of carrier.
Since the frequencies of Type 99 tones fall in the voice band,
they are passed through the 300 Hz high pass filter in the voice
path. Next, the tones are shunted through a closing switch and
passed into the tone pat h in front of the tone limiter. The tone
limiter passes the tones on to the tone detector port of the
microprocessor.
Voltage Regulator Circuitry
The battery voltage (IGN A+) enters the radio at J11 on the
Power Amplifier Board. From the PA Board, IGN A+ is routed
directly to the Main Board where it is filtered and passed through
a relay as A+_SW. A+_SW is fed to the regulator circuits which
provide a regulated 8, 5 and 2 volts to the appropriate circuits
throughout the radio. A+_SW is als o fed to the Audio Power
Amplifier circuits.
FRONT PANEL ASSEMBLY
The Front Panel Assembly (N29/SMR18) houses the Front
Panel Board, the internal 4-watt speaker, and all control switches
and indic ators for the r adio . Th e pan el is ma de of hi ghly d ura ble
plastic with rounded corners and recessed controls and indicators
for passenger safety. The Front Panel Board mounts on back of
the Front Panel. The following display elements are on the front
panel:
• Channel Number Display, 7-segment LED with num-
bers 1-8
• Tr an s mi t Lig h t, lights w he n r ad io is tr an s mit ting
• Busy Light, ON wh en cha nnel is busy
See the Operator’s Manual LBI-38659 for a detailed de-
scription of the indicators, controls and operation of the radio.
The micro phone connector is an RJ-11 type, female connector mounted to the Main Board b ut loca ted o n t he f ront p anel o f
the radio. A strain relief is provided to secure and protect the
microphone connector. A microphone Hook Switch with magnetic sensing is provid ed with the radio to b e mounted exte rnally
on the dashboard of th e vehicle. Removing t he microphone f rom
the Hook Switch disables the Channel Guard, enabling the
operator to monitor the channel before sending a message.
POWER AMPLIFIER ASSEMBLY
The Power Amplifier Assembly (N29/SMR13 for the 440470 MHz band and N29/SMR12 for the 470-512 MHz band)
contains the Power Amplifier Bo ard mounted to a n aluminum
diecast heat sink. The PA Board contains the RF Power Amplifier, the RF output LP harmonic filter, the PIN diode T/R
switch, and a stripline directional coupler for power output
sensing.
The RF Power Amplif ier is drive n by the output of the
exciter on the Main Board, which is c onnected b y co ax to t he
PA Board. The PA Board amplifies the output from the Main
Board to a level of 40 watts over the frequency range of both
band splits (440-470 MHz & 470-512 MHz). The output of
the PIN diode T/ R switch is coaxially connecte d to the receiv er
front end circuitry on the Main Board. The T/R switch has a
separate c onnection to th e a ntenna jack. T h e IGN_A+, Exter-
nal Speaker and External Alarm lines connect to the Power
Amplifier Board at J11.
FEATURES
PC PROGRAMMABLE
The entire personality of the radio is programmed into the
radio using an IBM or IBM compatible personal co mputer and
the following equipment:
• Serial Programming Interface Module TQ-3310
• MDS Programming Cable TQ-3361
• MDS Conventional Programming Software TQ-
3363
The interf ace module is connected between a serial port
on the computer and the RJ-11 microphone connector on
the Front Panel of the radio. An RS-232 cable connects the
serial port to the Interface Module. The Programming Cable
(TQ-3361) is connected from the Interface module to the RJ11 microphone connector on the front of the radio. Refer to
TQ-3363 for a complete set of i nstruct ions on how to p rogram the MDS Conventional radio.
Tracking Data
The test handset is used to make operational circuit adjustments in the radio using digitally controlled potentiometers. The resulting "Tracking D ata" is stored in the EEPROM
personality of the radio. A utility in the PC Programming
software can be used to read the T racking Data. All programming is done through the microphone co nnector on the Front
Panel of the radio, without the need of opening the radio
package. The Tracking Data adjustments made with the test
handset include the following:
• Reference voltage for Transmit RF power output
level
• Voltage for VCTCXO fr equency adjustment
• Modulation deviation adjustment for VCO
• Channel Guard modulation dev iation a djustment
• Microphone gain a djustmen t, 2 pots i n voice path
• Other filt er a d j usti ng p o ts
Programmable Features/Options
Squelch Tail Elimination
Squelch T ail Elimination (STE) is used with both tone and
digital Channel Guard to shorten the noise burst between
receiving a call and muting the receiver audio path. This is
commonly referred to as reducing squelch tails. The STE burst
is transmitted when the microphone PTT is released. The
receiving r adio deco des the burst an d mutes the re ceiver a udio
for 250 ms. The dura tio n of this mute tim e includ es time for
the end of transmission plus that of the squelch t ail. The radio
looks for STE on the receiv ed signal when the microphone is
either ON or OFF-hook. The STE is enabled for transmit
and/or receive by PC programming t he ra di o’s personality.
Carrier Control Timer
The Carrier Control T imer (CCT) turns off the tr ansmitter
after the microphone push-to-talk (PTT) switch has been
keyed for a pre-programmed time period. A pulsing alert tone
will warn t he operator to unkey and then rekey the PTT to
continue the tran smis sion. The timer ca n be progr ammed to
time out for 15 to 225 seconds in 15 second increments. The
CCT will b e t he s a me for all channels in t h e personality.
Type 99 Decode
T ype 88 2-tone sequential selective calling is programmable on a per channe l basis , with the radi o enabled to decode
only. On a channel where Type 99 has not been selected in
programming, the T y pe 99 tone decoder is disabled. The Type
99 selective calling option operates in either Type 99 Select
Mode or Type 99 Monitor Mode. The default mode can be
designated in programming. See the section DETAILED
TYPE 99 OPER AT ION AND PROGR AMMING, on page
11, for more detailed information on T y p e 99 Decode.
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LBI-38653 LBI-38653
Talkaround
Radio to radio direct communication is possible on a
per-channel basis. This is direct communication without the
use of a repeater .
Automatic Number Identification (A.N.I.)
As an option, one ID number pe r radio is programme d on
a per chan nel b asis. The microprocessor gener at es the special
1600 Hz A.N.I. signal which is coded with a 4-bit phase
reversing code. It is sent at a 400 baud rate as part of the
handshaking preamble to a repeater just after PTT has been
pressed, or alternatively just after release of the PTT key.
A.N.I. is received and optionally demodulated by the repeater
as part of the system protocol when so installed.
Receive- Only O p er ati on
Channels can be programmed to a receive-only operation.
Channels cannot be p rogrammed f or Tr ansmit-only operation.
Busy Channel Lock Out
With Busy Channel Lock Out programmed, the radio
canno t tran s mit on a ch ann el alr ead y busy . I f th e c han nel is
busy, fas t pul sing beeps will sound (without stopping), until
the PTT switch is r eleased. The r adio must be program med fo r,
and receiving, the c orrect Channel Gua rd. The comb ination of
Channel G uard a n d Busy Chann el L ock O ut p re vents t he u ser
from talking on a channel that is already in use (busy).
When the Busy Channel Lock Out option is enabled
without programmed Channel Guard, the user is prevented
from transmitting over a channel until there is no carrier
present in the channel.
Minimum Volume Level
The Front Panel VO LUME controls per mit adjustment of
the audio level. Minimum levels are programmable. This
feature prevents missed calls due to a low volume level.
Power Level
Incremental transmitter power level change can be programmed to permit setting the output power to rated value. The
selected power level will be used for all channels.
Digital Channel Guard
Channel Guard provides a means of restricting calls to
specific radios through the use of a continuous tone coded
squelch system (CTCSS), or a multi-code digital squelch
system (DCG). Tone frequencies range from 67 Hz to 210.7
Hz. There are 8 3 stand ard programmable digital codes.
The Channel Guard tone frequencies and codes are software programmable. Both tone frequencies and digital codes
may be mixed on each channel. The frequencies and codes are
shown in Tables 1 and 2. A Channel Number d isplay t hat does
not flash, indicates that Channel Guard is enabled, or that
Channel guard is not programmed. A flashing Channel Number indicates that Channel Guard is programmed and disabled.
Table 1 - Channel Guard Tone Frequencies
Standard Tone Frequencies In Hertz
67.0 82.5 97.4 114.8 136.5 162.2 192.8
71.9 85.4 100.0 118.8 141.3 167.9 203.5
74.4 88.5 103.5 123.0 146.2 173.8 210.7
77.0 91.5 107.2 127.3 151.4 179.9
79.7 94.8 110.9 131.8 156.7 186.2
EXTERNAL SPEAKER (Optional)
The power connector provides a place to connect an
external s peaker. The interna l speaker mu st be di sconnect ed
when an external speaker is used.
BATTERY POWER
The vehicl e 12 volt batt ery with neg ative ground i s all that
is required for operation of the radio. A cable connects the
battery to a male co nn ec tor mounted on t he back of the ra d i o .
EASY ACCESSIBILITY
The radio circuitry is mostly contained on a single Main
Board, with the exception o f the PA Board and the F ront Panel
Board. Access to the Mai n Boa rd and the insid e of t he r adio is
easy with the removal of the top and bottom covers with two
screws each. Then the few adjustment controls (most are
adjusted with PC programmi ng) can be easil y reached. Four
more screws will permit removal of the front panel, giving
access to the Front Panel Board along with the switch and
indicator circuitry.
Table 2 - Primary and Equivalent Digital Codes (OCTAL)
PRIMARY
CODE
023 340,766 132 605,634,714 237 464,642,772
025 133 413,620 243 267,342
026 566 134 273 245 370,554
031 374,643 135 205,610 246 542,653
032 136 502,712 252 661
036 137 142 174,270 254 314,612,706
037 560,627 143 333 255 425
043 355 144 466,666 262 316,431,730
047 375,707 145 525 266 655
051 520,771 147 303,306,761 271 427,510,762
053 150 256,703 274 652
054 405,675 152 366,415 276 326,432
056 465,656 153 606,630 307 362,565
057 172 155 233,660 311 330,456,561
060 116,737 156 517,741 312 515,663,743
065 301 157 322,503 315 321,673
066 734 161 345,532 317 546,614,751
067 516,720 162 416,553 324 343,570
071 603,717,746 163 460,607,654 325 550,626
072 470,701 164 207,732 331 372,507
073 640 165 354 332 433,552
074 360,721 171 265,426 344 471,664,715
075 501,624 176 244,417 346 616,635,724
076 203,754 212 253 351 353,435
104 226,557 213 263,736 356 521
107 365 217 371,453,530 363 436,443,444,662
114 327,615 222 445,457,575 446 467,511,672
115 534,674 223 350,475,750 447 473,474,731,744
117 411,756 224 313,506,574 452 524,765
122 535 225 536 454 513,545,564
123 632,657 227 261,567 455 533,551
125 173 231 504,631,636,745 462 472,623,725
127 412,441,711 234 423,563,621,713 523 647,726
130 364,641 235 611,671,723 526 562,645
131 572,702 236 251,704,742
EQUIVALENT
CODE
PRIMARY
CODE
EQUIVALENT
CODE
PRIMARY
CODE
EQUIVALENT
CODE
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The MDS radio is able to recognize the A,B , and C
tones. Individual, Group and Quick Call formas may
be used simultaneously.
LBI-38653 LBI-38653
DETAILED TYPE 99 OPERATION
AND PROGRAMMING
The original Type 99 programming provides individual,
group and super group call decode. The Motorola format twotone seq uential signali ng schemes can also be decoded.
The MDS Conventi onal radio can be PC programm e d with
up to two separ ate tab les of to nes. Ei ther th e GE Type 99 format
or the Motorola format can be assigned to each tone table. The
tone decoder (Individual, Group and Super Group for the GE
format or Individual, Group and Quick Call for the Motorola
format) can be enabled individually for each channel. Once
enabled, one of the two tone tables can be selected for each
channel.
The Group Call format allows communication with all
radios within a subgroup. The Super Group Call (in GE tone
systems) or Quick-Call (in Motorola tone systems) allows communications between all radios in a system.
GE TYPE 99 FORMAT
T one frequencies in the GE tone system fall within the range
of 517-5 to 997.5 Hz.
In the GE tone format, the first tone ma y be from tone group
A (for Individual or Group calls) or from tone group C (for S uper
Group calls). The second tone may be from tone group B (for
Individual calls) or from tone group D (for Group and Super
Group calls).
The GE tone format is illustrated below and on the following
page:
For example, assume the paging num ber to be 123. Th e first
digit of the paging number is a 1. Look in Table 3 and read down
the column labeled "100’s Digit" to a 1. Read horizontally
across the column labeled "10 ’s Digit". The tone gr oup is B. The
second d ig it of t he pag ing num ber is a 2. T he t one n u mber is B2 .
Look in Table 4 and down the column labeled "Tone Designa-
tor" to find B2 . Read horizontally across the column labeled
"Tone Frequency". The first t on e f req uency is 787.5 Hz.
T o d ete rmin e th e seco nd t on e fre qu ency l ook in Table 3 and
as before, find the first digit of the paging number (1). The second
tone group is A. The third digit of the paging number is a 3 and
the tone Designator is A3. In Table 4 read down the column
labeled "Tone Designator" and find A3. Read horizontally
across the co lumn lab ele d "Tone Frequency". The s econd ton e
frequency is 802.5 Hz. For different pagi ng n umbers, locate the
first digit in the "100’s Digit" column and determine the tone
frequencies as described in the example.
Table 3 - Tone Groups
100’s
Digit
0
1
2
3
4
5
6
7
8
9
10’s
Digit
For First
Tone
A
B
B
A
C
C
C
A
B
NOT USED
1’s
Digit
For Second
Tone
A
A
B
B
C
A
B
C
C
Table 4 - Tone Generator Freq u encies
TONE
GROUP
A
B
C
DIAGONAL TONE 742.5 Hz
TONE
DESIGNATOR
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
C0
C1
C2
C3
C4
C5
C6
C7
C8
C9
FREQUENCY
TONE
682.5 Hz
592.5 Hz
757.5 Hz
802.5 Hz
847.5 Hz
892.5 Hz
937.5 Hz
547.5 Hz
727.5 Hz
637.5 Hz
652.5 Hz
607.5 Hz
787.5 Hz
832.5 Hz
877.5 Hz
922.5 Hz
967.5 Hz
517.5 Hz
562.5 Hz
697.5 Hz
667.5 Hz
712.5 Hz
772.5 Hz
817.5 Hz
862.5 Hz
907.5 Hz
952.5 Hz
532.5 Hz
577.5 Hz
622.5 Hz
The Motorola tone format is illustrated a s follows:
INDIVIDUAL CALL FORMAT
1.0 SEC
(Minimum)
Tone A
GROUP CALL FORMAT
1.0 SEC
(Minimum)
Tone A
SUPER GROUP CALL FORMAT
NONE
GAP
NONE
GAP
8 SEC
TONE B
3.0 SEC
(Minimum)
Tone B
3.0 SEC
(Minimum)
Tone D
Individual Call
Tables 5 and 6 may also be used to determine the tone
frequencies. The first digit of the code determines the tone
group used in the code (see Table 5). Then Table 6 is used to
determine the actual tone frequencies. For a code of 124, the
tone groups used are shown in Table 5. T one A and Tone B are
both located in tone group 1 an d Tone B is a tone number 4.
Refer to th e following examples for additional information.
Example 1 - Code 098:
The digit "0" in Table 5 (First Di git of Code) shows that
T one A is in Tone Group and T one B is i n Tone Group 2 (see
Table 6).
INDIVIDUAL CALL FORMAT
1.0 SEC
±20%
Tone A
GROUP CALL FORMAT
1.0 SEC
±20%
Tone A
SUPER GROUP CALL FORMAT
1.0 SEC
±20%
Tone A
NONE
±25%
GAP
200 MS
±25%
GAP
NONE
±25%
GAP
3.0 SEC
300%, -0%
Tone D
3.0 SEC
300%, -0%
Tone D
3.0 SEC
300%, -0%
Tone D
T one D is a diagonal tone used (in GE tone systems only)
when the first and second tone frequencies are the same. The
standard frequency for Tone D is 742.5 Hz, but may be
programmed with any tone frequency.
MOTOROLA FORMAT
Tone frequencies in the Motorola tone system are within
the range of 288. 5 to 1433.4 Hz. In the Mo torola tone format,
the first tone may be one of three tones: A f or Individual Call,
B for Quick Call and C for Group Call. The second or final
tone is B in all ca ses.
NOTE
Tone number 9 in Tone Group 4 is 524.6 Hz.
Tone number 8 in Tone Group 2 is 879.0 Hz.
Example 2 - Code 265:
The digit "2" in T able 5 shows that both T one A and T one
B are in Tone Group 2 .
Tone number 6 is 788.5 Hz.
Tone number 5 is 746.8 Hz.
5
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NOTE
LBI-38653 LBI-38653
MECHANICAL PARTS LIST
Table 5 - Motorola Type Coder Numbers
First Digit
of Code
1
2
3
4
5
6
7
8
9
0
A
Group from
Which Tone A
Is Selected
1
2
1
4
5
2
4
5
2
4
3
Group from
Which Tone B
Is Selected
1
2
2
4
5
1
5
4
4
2
3
Group Call (Quick-Call Format)
In Group Call applications, the Ton e Group is determined
by Table 7, while the frequency is determined by Table 6. Refer
to the following ex amples.
Group Call applications, t he Tone Group is determined
by Table 7, while the frequency is determined by Table
6. Refer to the following examples.
Example 1 - Group Call Code 07 (also code 27 and 37):
The digit "0" in Table 5 shows that Tone B is in Tone
Group 2 along with 20 to 29 and 30 to 39. Tone number 7 in
T one Group 2 is 832.5 Hz (see Table 6).
Example 2 - Group Call 98 (also cod e 48 a nd 8 8):
The digit "9" in Table 5 shows that Tone B is in Tone
Group 4 along with 40 to 49 and 80 to 89. Tone number 8 in
T one Group 4 is 496.8 Hz.
Table 7 - Motorola Group Call Tone Groups (TG)
GROUP CALL
CODE NUMBER
00-09 TG2
10-19 TG1
20-29 TG2
30-39 TG2
40-49 TG4
50-59 TG5
60-69 TG1
70-79 TG5
80-89 TG4
90-99 TG4
TONE GROUP
(TONE B)
Tone
No.
1
2
3
4
5
6
7
8
9
0
Tone
Group 1
349.0 Hz
368.5 Hz
389.0 Hz
410.8 Hz
433.7 Hz
457.9 Hz
483.5 Hz
510.5 Hz
539.0 Hz
330.5 Hz
Table 6 - Motorola Group Call Tone Groups (TG)
Tone
Group 2
600.9 Hz
634.5 Hz
669.9 Hz
707.3 Hz
746.8 Hz
788.5 Hz
832.5 Hz
879.0 Hz
928.1 Hz
569.1 Hz
Tone
Group 3
288.5 Hz
296.5 Hz
304.7 Hz
313.0 Hz
953.7 Hz
979.9 Hz
1006.9 Hz
1034.7 Hz
1063.2 Hz
1092.4 Hz
Tone
Group 4
339.6 Hz
358.6 Hz
378.6 Hz
399.8 Hz
422.1 Hz
445.7 Hz
470.5 Hz
496.8 Hz
524.6 Hz
321.7 Hz
Tone
Group 5
584.8 Hz
617.4 Hz
651.9 Hz
688.3 Hz
726.8 Hz
767.4 Hz
810.2 Hz
855.5 Hz
903.2 Hz
553.9 Hz
Tone
Group 6
1153.4 Hz
1185.2 Hz
1217.8 Hz
1251.4 Hz
1285.8 Hz
1321.2 Hz
1357.6 Hz
1395.0 Hz
1433.4 Hz
1122.5 Hz
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Figure 1 - MDS Conventional Radio Block D ia gr am
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MECHANICAL PARTS BREAKDOWN
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