Midland 70-1545 Service Manual

Model 70-1545

Mobile Transceiver

SERVICE MANUAL

6KEN SOFTWARE VERSION

Manual # KW208SM-6KEN

SCOPE OF THIS MANUAL

This manual covers the KG208 Series for the following bands:
KG208-08A…. 66-88 MHz.
KG208-15A…. 134-162 MHz.

KG208-15B…. 146-174 MHz.
KG208-20A…. 176-208 MHz

KG208-20B…. 208-245 MHz.
KG208-20C…. 240-276 MHz.

KG208-40SA…. 300-335 MHz
KG208-40A…. 335-365 MHz
KG208-40B…. 365-400 MHz
KG208-40C…. 400-435 MHz.
KG208-40DS…. 420-455 MHz
KG208-40D…. 440-475 MHz
KG208-40E…. 465-500 MHz
KG208-40F…. 485-520 MHz

The KG208-03, 30 –50 MHz band will be covered in an addendum to this manual.

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INDEX

SUBJECT PAGE

SCOPE OF MANUAL 2
INDEX (THIS PAGE) 3
DRAWING INDEX 4
SPECIFICATIONS 5

SECTION 1: INTRODUCTION 6
Applications 6

Radio Features 6
Safety Information 6
Model Number Coding 7
Initial inspection 8
Standard Package Contents / Drawing 8

SECTION 2: INSTALLATION 9
SECTION 3: OPERATION 11
Control Functions, Control panel Drawing 11

Display ICONS 12
Operating the Radio 13
Advanced Features 15
Special Keypad Functions 17

SECTION 4: CIRCUIT DESCRIPTION 20
Operating Voltage Control 20

Receiver 20
Transmitter 22
PLL 23
Logic Unit 23
Control Unit 23

SECTION 5: SERVICING INFORMATION 25
Test Equipment and Tools 25

Tuning and Adjustments 25
Disassembly Procedures 27

DRAWINGS 33
REPLACEMENT PARTS LISTS 50

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DRAWING INDEX

DRAWING PAGE

EXPLODED VIEW 33
MAIN UNIT SCHEMATIC 66-88 MHZ 35
MAIN UNIT SCHEMATIC 134-174 MHZ 36
MAIN UNIT PCB LAYOUT 37
MAIN UNIT SCHEMATIC 176-276 MHZ 38
MAIN UNIT SCHEMATIC 300-520 MHZ 39
CONTROL UNIT SCHEMATIC 40
CONTROL UNIT PCB LAYOUT 41
LOGIC UNIT PCB LAYOUT 42
LOGIC UNIT SCHEMATIC 43
VCO UNIT SCHEMATIC 66-88 MHZ 44
VCO UNIT SCHEMATIC 134-174 MHZ 45
VCO UNIT SCHEMATIC 176-276 MHZ 46
VCO UNIT SCHEMATIC 300-520 MHZ 47
VCO UNIT PCB LAYOUT 48
DCS UNIT SCHEMATIC & PCB 49

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SPECIFICATIONS

KG208 Mobile Transceiver

GENERAL

Frequency Range 30 MHz Band (1) 80 MHz Band VHF Band 200 MHz Band UHF Band

Designated 03 Designated 08 Designated 15 Designated 20 Designated 40
A: 30 - 40 MHz A: 66 - 88 MHz A: 134-162 MHz A: 176-208MHz SA: 300-335 MHz

B: 40 - 50 MHz B: 146-174 MHz B: 208-245 MHz A: 335-370 MHz
C: 45 - 55 MHz* C: 240-276 MHz B: 365-400 MHz
C: 400-435 MHz
* Special Order DS: 420-455 MHz

(1) This band will be covered in an addendum) E: 465-500 MHz
F: 485-520 MHz

Number of Channels 200 channels or 100 channels with channel name
Channel Spacing 12.5, 20, 25, 30 kHz programmable by channel
Mode of Operation Simplex or Semi duplex, Push To Talk
Antenna Impedance 50 Ohms unbalanced
Power Supply 13.6 V DC +/- 20% negative ground
Power Consumption TX: <3 A @ 10 W, <5 A @ 25 W, <8A @ 40 W,

RX: 330 mA standby, 370mA receive-mid volume, 525 mA receive-max volume
Environmental Conditions Ambient temperature: -30 C to +60 C (-22 F to +140 F)
Relative humidity: 95% at 35 C

Construction Die cast aluminum chassis and control unit, stamped steel covers
Dimensions High power model Standard model

166 mm (6.54” width 166 mm (6.54” width
50 mm (1.97”) high 50 mm (1.97”) high
195 mm ((7.7”) long 173 mm (6.81”) long

Weight 1.7 kg (3.74 lb.) 1.5 kg (3.3 lb.)
Color Dark gray, textured Dark gray, textured

TRANSMITTER

RF Power Output 30 MHz Band 80 MHz Band VHF Band 200 MHz Band UHF Band

Models are available at 40 W 25 W 5-10 W (10 W) 25 W 5-10 W (10W)
10 W, 25 W & 40 W 10-25 W (25W) 10-25 W (25W)
in VHF and UHF bands 20-40 W (40W) 20-40 W (40W)

Max. Frequency Deviation Wide band: +/- 5 kHz, Narrow band, +/- 2.5 kHz
Frequency Stability +
Frequency Response Within +1, -3dB of 6 dB/octave pre-emphasis from 300 to 3000 Hz, 1 kHz ref.
Signal To Noise Ratio Wide band: more than 50dB at 1 kHz 70% modulation

Narrow band: more than 45 dB at 1 kHz 70% modulation

Modulation Distortion Less than 3% at 1kHz 70% modulation
Spurious and Harmonics More than 70 dB below rated power

All powers are programmable high or low (two levels) by channel and selectable at front panel

Low power levels are adjustable down to 2 W.

0.0003%

RECEIVER

Intermediate Frequency 1
Frequency Stability +
Sensitivity Less than 0.4 µV for 20 dB quieting, Less than 0.25µV for 12 dB SINAD
Squelch Sensitivity Less than 0.25 µV
Selectivity More than 70 dB at 25 kHz point
Blocking More than 90 dB
Intermodulation More than 70 dB
Spurious Response More than 70 dB
AF Resp onse Within +1, -3 dB of 6 dB/octave de-emphasis from .3 to 3 kHz, 1 kHz Ref.
AF Outp ut Internal speaker: 4 W max, 2.5 W @ < 5% distortion into 4 Ohms, 1 kHz, 70% modulation

External Speaker: 6 W max, 4 W @ <5% distortion into 4 Ohms, 1 kHz, 70% modulation
Signal to Noise Ratio Wide band, 25 KHz: more than 50 dB at 1 kHz 70% modulation

Narrow band, 12.5 KHz: more than 45 dB at 1kHz 70% modulation

Due to constant technological developments and changes, specifications may vary without notice. Options and specifications may
vary slightly in different countries to suit local requirements.

st

IF: 48.5 MHz, 2nd IF: 455 kHz

0.0003%

D: 440-475 MHz

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SECTION 1.

INTRODUCTION

1.1 INTRODUCTION

1.1.1 APPLICATIONS

The KG208 Series mobile radio transceivers provide professional communications for a wide variety of
applications. Government agencies, police departments, security and public safety agencies, courier and
freight companies, construction, airport ground services, petroleum and utility industries may use the
radio for reliable communications.

KG208 radios use sophisticated technology and microprocessor control to allow the installer to quickly
change the radio’s characteristics. Any computer-equipped dealer or service shop with the necessary
software and programming manual can easily program your radio to your specific operating requirements.
The radio’s many advanced features will add to the usefulness, safety and efficiency of any
communications system.

1.1.2 RADIO FEATURES

• Simplex or semi-duplex operation

• High performance specifications

• Wide non-tuning bandwidth

• Wide range of standard bands for use in many countries

• Wide-band/Narrow band by channel

• IBM-PC™ compatible field-programmable features.

• Emergency alert

• Direct input of channel number

• Up to 200 channels or

• Up to 100 channels with 8-digit alphanumeric “Channel Name” feature

• Kill Mode (disable from another radio).

• ANI, Unit ID

• CTCSS by channel, DCS optional

• DTMF or 5-Tone select-call encoder / decoder

• Memory storage of frequently called numbers

• Caller ID

• Voice Scrambling

• Single-tone encoder

• Transmitter high or low power selectable from pan el or assigned by channel

• Readout of programmed frequencies and tones

• Transmit time limiter.

• Multiple scanning modes.

• Large alphanumeric LCD display with back-light

• User friendly

• Self diagnostics

• Small, rugged die-cast construction

• State of the art technology

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1.1.3 IMPORTANT SAFETY INFORMATION

The Federal Communications Commission (FCC) of the United States in General Docket 79-144 adopted
a safety standard for human exposure to radio frequency energy. Proper operation of this FCC regulated
equipment will result in exposure significantly below FCC recommended limits.

DO NOT transmit if someone is within .6 meters of the radio antenna.
DO NOT press the transmit switch unless you actually want to transmit.
DO NOT allow children to play with any radio equipment containing a transmitter.
DO NOT operate the radio near unshielded electrical blasting caps.
DO NOT operate the radio in an explosive atmosphere unless the radio is specifically approved for such

use.

DO NOT operate the radio in a vehicle while refueling.

1.1.4 MODEL NUMBER CODING

The radio model number contains information about the radio.
Typical model number: KG208 - 15 B 25 K

KG208 = model series

15 = 150 MHz band

B = band segment (see specifications)
25 = power output maximum

K = manufacturers code.

Example: Model KG208-40C40K is a KG208 mobile radio, UHF 400-435 mHz band, 40 W.

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1.1.5 INITIAL INSPECTION

When you receive your radio, inspect the carton for any signs of shipping damage. Report any damage
to the carrier immediately. Then remove and check the contents to be sure all items have been included.

1.1.6 STANDARD PACKAGE

TAG Part name Part No. Qty.

1 Transceiver KG208-xxxxxx 1
See listing at right and drawing below. 2 Hand Microphone KD-559 1
3 Hang-up clip screw

99-40-0204-1214 3

4 Hang-up clip washer 99-47-1104-23 3
5 Hang-up clip

1.1.7 OPTIONAL ITEMS 6 Mounting bracket
7 Mounting screw
Check your order or packing list for the items 8 Flat washer
to be supplied. 9 Battery cable
10 Spare fuses

14-11-64-01 1
2A10-0164 1
STB-5 x 15 4
FW-5PAI 4
SCN-14-BC 1
MINI-12.5A 2

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STANDARD PACKAGE CONTENTS

SECTION 2.

INSTALLATION

2.1 RADIO INSTALLATION

Note: It is highly recommended that a qualified technician or engineer perform installation. Special

equipment is required to properly install and tune the antenna.

2.1.1 LOCATION

The recommended location is under the dash or near the console area within reach of the operato r. Do
not mount the radio near heat vents or where it will be exposed to direct sunlight. Leave space behind
the radio for proper ventilation and for access to the connectors and cables at the rear of the radio. Note
that the bracket is designed to permit mounting on surfaces above or below the radio.

2.1.2 TRANSCEIVER INSTALLATION [Tag # from drawing above]
Mount the radio as follows:

1. Use the mounting bracket, tag # 6, to mark the location of the mounting holes.

2. Drill four 3mm (1/8”) holes for the mounting screws.

3. Attach the bracket using 4 black self-tapping screws and flat wa shers, tag # 7 & 8.
Make certain that the release tabs are facing forward.

4. Slide the radio into the bracket, aligning the slots on each side. Press in until it snaps into
place.

2.1.3 BATTERY CABLE INSTALLATION

The KG208 operates from a 12 V negative ground

1. For 12 V positive ground systems, use an Astron 1212 polarity converter.

2. For 20 - 50 V negative ground systems use a NewMar model 32-12-10 converter.

3. For 20 - 56 V negative, positive or floating systems, use NewMar model 48-12-12-I
isolated converter.

4. Install the cable into the vehicle. The cable terminals should b e placed near the battery or
converter. The white connector should be near the radio.

5. Avoid hot parts in the engine compartment.

6. Tie cable to the vehicle body at several points to avoid movement.

7. Use rubber grommets or tape when passing through holes in the chassis.

8. Connect blue lead to the or the negative terminal of the battery or converter.

9. Connect the red lead to the positive terminal of the battery or converter.

10. Connect the white connector to the matching connector on the radio cable.

11. Do not turn on the radio until installation is complete.

2.1.4 MICROPHONE INSTALLATION

It is very important that the microphone be installed in a convenient location to avoid distracting the driver
when he wants to use it. Select a location near the radio to avoid stretching the microphone cable.

1. Connect the microphone to the radio.

2. Using the hang-up clip, mark the location for the three mounting holes.

3. Drill three 2.5 mm (3/32”) holes. Be very careful that you do not drill into wires or other
components.

4. Mount the hang-up clip using three self-tapping screws and flat washers.

5. Hang the microphone on the clip.

2.1.5 OPTIONAL EXTERNAL SPEAKER INSTALLATION

The external speaker is highly recommended for noisy vehicles or where multiple radios are in use.
It provides an increase in power over the internal speaker and it may be positioned to provide better
clarity for the operator.

1. Remove the two large mounting knobs and remove the speaker from the mounting bracket.

2. Use the mounting bracket to mark the location of the mounting holes.

3. Drill two 3 mm (1/8”) holes.

vehicle system.

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4. Mount the bracket using two self-tapping screws and flat washers.

5. Mount the speaker into the bracket using the mounting knobs removed in step 1.

6. Remove the white connector on the rear of the radio. Note that this is a jumper to connect
the internal speaker. Use tape or a nylon strap to attach this connector to one of the cables
on the radio to avoid losing it. It is required to reconnect the internal speaker if the radio is
removed for testing.

2.1.6 ANTENNA INSTALLATION

The recommended location for the antenna is on the roof or trunk (boot) lid.

1. Follow the instructions supplied with the antenna for installation.

2. Install the cable and route it to the rear of the radio.

3 Connect the cable to the antenna connector of the radio.

4. When installation is complete, use a thru-line wattmeter to adjust the antenna for best SWR.

2.1.7 PROGRAMMING

Programming instructions are too extensive to be included in this manual. Please refer to the separate
Programming Manual supplied with the program kit. Programming is done using a PC (Personal
Computer). A portable lap-top computer is recommended so that the radio may be programmed in the
vehicle.

A KG208 6KEN programming kit is available from your dealer. It consists of a detailed manual, software
and an interface cable.

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