manualshive.com logo in svg

Motorola Radius CM200, Installation Manual, Page: 26 / 36

Share
Download
Motorola Radius CM200 Installation Manual Download Page 26

18

Chapter 8

Operation of a Conventional Ignition System

8.1

Introduction

To effectively reduce ignition interference in a vehicle, it is necessary to understand the operation of 
an automobile ignition system.

Ignition is necessary in a gasoline engine to ignite the gasoline vapor and the air mixture in its 
cylinders. The system is made up of the battery, distributor, breaker points, coil, condenser, and spark 
plugs. The battery is the only electrical source of power in an automobile, so the lower battery voltage 
must be stepped up to the high voltage necessary to arc across the spark plug electrodes. This arc 
ignites the gas mixture.

8.2

Sources of Ignition Interference 

In the conventional ignition system (Figure 8-1) a mechanical circuit breaker (the cam and points in 
the distributor) opens the primary circuit of the ignition coil, and high voltage is developed at the 
secondary. This high voltage is synchronized and applied to each spark plug by the distributor.

Figure 8-1.

Typical Vehicular Ignition System, Simplified Schematic Diagram 

HV Lead

Distributor

Spark  plug    leads

Spark

Plugs

Ignition

Coil

Condenser

Cam

Breaker

Points

Ignition

Switch

Battery

Ignition

Coil

Condenser

Stray

Capacitance

Cam

Breaker

Points

Ignition

Switch

Battery

Rotor Gap

Lead Inductance

Spark Plug Gap

FL0830261-O

Summary of Contents for Radius CM200

Page 1: ...lation Guide MOTOROLA the Stylized M Logo and Radius are registered in the US Patent Trademark Office All other product or service names are the property of their respective owners 2002 2003 Motorola Inc All rights reserved Printed in U S A 6802966C25 68P02966C25 A ...

Page 2: ......

Page 3: ...n 2 1 Planning the Power Cable Installation 2 2 2 Power Cable Installation Procedure 2 Chapter 3 Trunnion Installation 3 1 Planning the Mounting Trunnion Installation 5 3 2 Trunnion Installation Procedure 5 Chapter 4 Antenna Installation 4 1 Antenna Installation and Compliance with Radio Frequncy RF Energy Safety Standards 8 4 2 Selecting an Antenna Site Location on a Metal Body Vehicle 8 4 3 Ante...

Page 4: ... Induced Noise 17 Chapter 8 Operation of a Conventional Ignition System 8 1 Introduction 18 8 2 Sources of Ignition Interference 18 Chapter 9 Detection of Noise Sources 9 1 Noise Detection Procedure 20 9 2 Sources of Noise 21 Chapter 10 Noise Reduction Techniques 10 1 General 22 10 2 Ignition System Interference 22 10 2 1 Engine Maintenance and Tune Up 22 10 2 2 Available Noise Reduction Kits 22 1...

Page 5: ...re that antenna installation is per Chapter 4 of this manual Be sure that Product Safety and RF Safety Booklet enclosed with this radio is available to the end user upon completion of the installation of this radio Before using this product the operator must be familiar with the RF energy awareness information and operating instructions in the Product Safety and RF Exposure booklet enclosed with e...

Page 6: ... 4 Never activate the radio transmitter while the vehicle is in motion and the vehicle trunk lid is open Braking System Tests Be sure the following vehicle testing is done in an isolated area The following procedure checks for the most common types of interference that may be caused by a radio transmitter to a vehicle braking system 1 Run the vehicle engine at idle speed and set the vehicle transm...

Page 7: ...y the radio transmitter and verify that the vehi cle can be braked properly to a sudden panic stop while NOT speaking into the microphone 10 Repeat Step 9 except do so while speaking into the microphone 11 Repeat Steps 9 and 10 except use a vehicle speed of 30 miles 50 kilometers per hour For radios installed in vehicles fuelled by liquefied petroleum gas refer to the U S National Fire Protection ...

Page 8: ...vi Information for Vehicles with Electronic Anti Lock Anti Skid ...

Page 9: ...ion of various types of microphones 1 2 Plan the Installation 1 Mount the radio horizontally near the driver so the driver can easily view access and operate the controls and accessories 2 Ensure that the location is not exposed to dirt and moisture 3 Verify that there will be sufficient space around the mobile unit for air flow and installation 4 Check that there is enough routing space for the p...

Page 10: ...m bit to drill an access hole in the fire wall Install a grommet with a 3 16 inch 4 9 mm inside diameter into the hole to protect the power cable 3 From inside the vehicle feed the red and black leads without the lugs attached through the access hole and into the engine compartment See Figure 2 1 CAUTION This radio must be operated only in negative ground electrical systems Operating the radio on ...

Page 11: ...hassis ground 8 Connect the red lead ring lug from the fuse holder to the positive battery terminal Make sure the adapter cable is connected to the main power cable red lead 9 Carefully check that all connections are proper Insert the fuse into the fuse holder and close the cover See Figure 2 2 Figure 2 1 Power Cable Routing into the Engine Compartment NOTE Locate a good vehicle ground point The v...

Page 12: ...llation Figure 2 2 Power Cable Assembly Fuse Cover Red Lead Red Lead Mounting Hole Molded In Line Fuse Holder To Vehicle Chassis Ground Engine Compartment To Battery Adapter Firewall Red Lead Black Lead Ring Lugs FL08302470 ...

Page 13: ...n Installation Procedure 1 Select either the transmission hump or an open underneath portion of the dash to mount your radio See Figure 3 1 When mounting the trunnion on the transmission hump be careful that the transmission housing is not affected 2 Use the trunnion mounting bracket as a template to mark the hole positions on the mounting surface Use the innermost three holes for a curved mountin...

Page 14: ...urface Tab Thumb Screw 2 TRANSMISSION HUMP MOUNTING Tab Thumb Screw 2 Sheet Metal Screws Trunnion Mounting Bracket Trunnion Mounting Bracket FL0830250O 1 1 84 46mm 2 92 73mm 2 92 73mm 1 84 46mm 1 12 28mm Figure 3 1 Transmission Hump Mounting Top and Below Dash Mounting Bottom ...

Page 15: ...Trunnion Installation 7 Figure 3 2 Radio into Trunnion Thumb Screw Thumb Screw Trunnion FL0830329O Figure 3 3 Locking Mounting Bracket RLN4779 ...

Page 16: ...g an antenna on the trunk lid Be sure that the distance from the antenna location on the trunk lid will be at least 85cm 33 inches from the front surface of the rear seat back to assure compliance with RF Energy Safety standards Ensure that the trunk lid is grounded by connecting grounding straps between the trunk lid and the vehicle chassis IF THESE CONDITIONS CANNOT BE SATISFIED THEN MOUNT THE A...

Page 17: ...th the antenna kit Run the coaxial cable to the radio mounting location If necessary cut off the excess cable and install the cable connector 2 Connect the antenna cable connector to the radio antenna connector on the rear of the radio See Figure 4 1 4 4 Completing the Installation 1 Mount the microphone clip to a convenient spot near your radio 2 Your microphone has a telephone type connector at ...

Page 18: ...unting Frame Figure 5 1 1 Make the necessary connections to the radio for power antenna and accessory connector as shown in Figure 4 1 2 Plug in all the connectors and push the radio firmly into the mounting frame until the two springs snap into place NOTE 1 The tabs are easily bent back by twisting a large flat bladed screwdriver in the slot behind the tabs 2 For a more secure installation the mo...

Page 19: ... 5 Mount the trunnion bracket with the screws supplied See Figure 5 2 6 Insert the speaker into the trunnion bracket and tighten the two wing screws 7 Insert the external speaker accessory plug into the accessory connector of the radio NOTE 1 The fixing tabs should be checked for tightness each time the radio is removed The tabs are easily tightened by twisting a large flat bladed screwdriver in t...

Page 20: ...river or on the headliner just above the driver The microphone should never be mounted near the window or in a place where the road and ambient background noise would be substantially high above 85 dB SPL 5 3 1 Connecting to the Mobile Radio The visor mounted microphone cable connects to a 16 pin connector block part of the hardware supplied one wire connects to pin 2 and the other wire connects t...

Page 21: ...to 13 8 V dc battery supply Maxi mum current 0 25 amps 5 Flat_TX_Audio Input Input impedance Greater than 35 k Ohms The nominal input level is 150 mV rms for 60 deviation 6 SCI Serial Communication Interface for configuration of this pin as General Purpose Input in addition to pins 8 12 and 14 return the radio to an authorized service center 7 Ground Used as ground 8 Programmable I O Input or outp...

Page 22: ...sistance 5 k Ohms 12 Programmable I O Input or output 13 Switched B Switched Battery Voltage 13 8 Vdc 500 mA max when radio is ON 14 Programmable I O Input or output 15 Internal Speaker Connected to internal speaker and by internal jumper to pin 16 16 External Speaker Connect external 8 or 4 Ohm speaker to pins 1 and 16 CAUTION Bridge type output Neither pin 1 nor 16 is Ground Table 6 1 Connector ...

Page 23: ... 1 13 or 16 on the accessory connector to Ground this may damage the radio Figure 6 2 Accessory Connector To Vehicle Chassis Blk MAEPF 22954 O 1 2 16 4 15 J3 4 Red Wht Blk External Alarm On Off Switch Relay Bottom View Alarm Device Horn or Lights Horn Relay Contacts or Light Switch To Vehicle Battery Existing Vehicle Wiring External Alarm Relay Kit MAEPF 23082 A Figure 6 1 HLN9328 External Alarm C...

Page 24: ...M or CB radios are installed as original equipment These radios are also subject to electrical noise interference and the manufacturer may install noise suppression components only upon those vehicles which require radio equipment at the time of manufacture These noise suppression components should be added in any first attempt to suppress noise The three major noise sources affecting mobile radio...

Page 25: ...degrade both transmit and receive performance of a mobile radio 7 4 Induced Noise Induced noise enters the radio through the proximity of radio wiring to other wiring in the vehicle Electrical currents through the standard vehicular wiring can induce undesirable noise signals into the radio cabling Communication is degraded simply because the wiring provides a transformer type coupling action with...

Page 26: ...tage necessary to arc across the spark plug electrodes This arc ignites the gas mixture 8 2 Sources of Ignition Interference In the conventional ignition system Figure 8 1 a mechanical circuit breaker the cam and points in the distributor opens the primary circuit of the ignition coil and high voltage is developed at the secondary This high voltage is synchronized and applied to each spark plug by...

Page 27: ...current decreases and by self induction an electromotive force is induced in the primary which is many times greater than the battery voltage The high voltage inducted in the coil secondary causes a spark across the distributor rotor to spark plug wire gap and then across the spark plug gap for a short interval of time when the breaker points open The condenser reduces arcing of the points The sec...

Page 28: ...e sure the pick up loop has sufficient insulation to prevent the input of the radio from coming into direct contact with high voltage points in the vehicle ignition system A non polarized bypass capacitor which has alligator clips firmly attached can be used on a trial and error basis to locate wiring which needs additional filtering Keep capacitor lead lengths short for best suppression Ceramic d...

Page 29: ...not microphonic and is placed away from the noise of the engine and exhaust Operate the controls for fans blowers power windows headlamps turn signals windshield wipers and other electrical accessories Listen for the presence of noise in the received radio signal This will allow the source of the interference to be determined Some noise sources cannot be turned on and off at will These sources wil...

Page 30: ...good condition They should be replaced at least every 30 000 miles 4 Be sure that spark plug wires make good solid contact at each end and are routed as far as possible from low voltage leads 5 Many late model automobiles are equipped with a shield over the distributor points Check to see that this shield is properly positioned and securely attached 10 2 2 Available Noise Reduction Kits Motorola o...

Page 31: ...gnition wire to connect the ignition coil to the distributor cap 10 2 5 Battery Connections The radio set power cable can pick up noise generated in the vehicle This can be minimized by connecting the power cable directly to the battery instead of the fuse block The battery acts like a large capacitor about one Farad for a 50 amp hour battery which bypasses induced noise The battery ground lead sh...

Page 32: ...Whine Suppression Figure 10 3 Alternator Whine Suppression Step 1 Mount Capacitor 0 5 F Coaxial Type under generator ground screw Step 3 Connect wire lead to capacitor using lockwasher and nut Step 4 Connect capacitor lead to armature post Caution Do not connect capacitor to field teminal Step 2 Disconnect wire dashed from armature post and connect to capacitor using lockwasher and nut FL0830310 O...

Page 33: ...g Hardware Kit part of the TLN5277 Noise Reduction Kit which provides electrical bonding of the hood or trunk to the vehicle body while permitting them to be opened 10 6 Other Electrical Noises Other elements of the electrical system which can generate noise are listed below These can be suppressed by connecting a 0 5 µF bypass capacitor between the noise source and ground 1 Ammeter to battery lea...

Page 34: ...e is suppressed by bonding the part using one inch wide ground straps keep them as short as possible Some common points where bonding may be helpful are listed below see Figure 10 5 A From engine block to the firewall B From engine block to vehicle frame at points where the engine is shock mounted C From the battery ground terminal to the vehicle body D From top of front wheel A frames to chassis ...

Page 35: ......

Page 36: ...lation Guide MOTOROLA the Stylized M Logo and Radius are registered in the US Patent Trademark Office All other product or service names are the property of their respective owners 2002 2003 Motorola Inc All rights reserved Printed in U S A 6802966C25 68P02966C25 A ...

Reviews:

No comments