Harris M7300 Service Manual

Harris M7300 Service Manual

We have 5 Harris M7300 Series manuals available for free PDF download: Operator's Manual, Installation And Product Safety Manual, Installation And Safety Manual, User Manual Mobile Radios with CH-721 Scan and System Control Heads. Added HHC-731 hand-held controller. Harris Corporation, Public Safety and Professi onal Communications (PSPC ) Busine ss, continually evaluates its technical publications for compl eteness, technical a ccuracy, and organization. Any use of th is softwa re or technology requires a separate written license from DVSI. CREDITS Harris, assuredc ommunicat ions, OpenSky a n d EDACS are registered tradem arks of and ProVoice is a tradem ark of Harris Corporation. Bird is a registered tra demark of Bi rd Electronic C orporation. M icrosoft and Windows are regist ered tradem arks of Micros oft Corporation. SmartSiren is a registered trade mark of Fede ral Signal C orporation. All other brand and product n ames are trade marks, re gistered tradem arks, or service marks of their respective holders. NOTICE! Informat ion and descripti ons contained he rein are the pr operty of Harris Corporation. Such information and descriptio ns may not be copied o r reproduced by any means, or disseminated or distributed without the ex press prior written permission of Harris Corporation, PSPC Business, 221 Jeff erson Ri dge Parkway, Ly nchburg, VA 24501. The voice codi ng technology embodie d in this pro duct is protect ed by intel lectual property rights in cluding patent rights, copyrights, and trade secrets of Digital Voice Systems, Inc. The user of this technology is exp licitly prohibited from attempting to decompile, reve rse engineer, or disassem ble the Obj ect Code, or in any other way convert th e Object Code into human-reada ble form. Repairs to this equipment should be made on ly by an authorized service technician or facility design ated by the supplier.

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Any repairs, alterati ons or substit utions of recom mended pa rts ma de by the use r to this equi pment not appro ved by the manufacture r could void the u ser's authori ty to ope rate the e quipm ent in additi on to the m anufacturer's warranty. Do not dispose of th is product in a public landfill. Take it to a recycling center at the end of its life. This manual is published by Harris Corporation without any warranty. Such changes will be incorporated into new editions o f this manua l. No part of this m anual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photoc opying and recording, for any purpose, wi thout the express written permission of Harris Corporation.Failure to comply with these precautions or with specific warnings elsewhere violates safety standards of design, manufacture, and intended use of the product. Harris Corporation assumes no liability for the customer's failure to comply with these standards. The WARNING symbol calls attention to a pr ocedure, practice, or the like, which, if not correctly performed or adhered to, could result in p ersonal injury. Do not proceed beyond a WARNING symbol until the conditions identified are fully understood or met. CAUTION The CAUT ION symbol calls attention to an operating procedure, practice, or the like, which, if not performed correctly or adhered to, could resul t in damage to the equipment or severely degrade equipment performance. The NOTE symbol calls attention to supplemen tal information, which may improve system performance or clarify a process or procedure. 1.2 RF ENERGY EXPOSURE AW ARENESS AND CONTROL INFORMATION FOR FCC OCCUPAT IONAL USE REQUIREMENTS Before using the two-way mobile radio, review th e following important RF energy awareness and control information and operational instructions. Comply with this information and instructions in order to ensure compliance wi th RF exposure guidelines.

CAUTION Changes or modifications not expressly approved by Harris could void the user's authority to operate the equipment. This two-way radio uses electromagnetic energy in the radio frequency (RF) spectrum to provide communications between two or more users over a distance. It uses RF energy or radio waves to send and receive calls. RF energy is one form of electroma gnetic energy. Other forms include, but are not limited to, electric power, sunlight, and x-rays. RF energy, however, should not be confused with these other forms of electromagnetic energy, which, when used improperly, can cause biological damage. Very high levels of x-rays, for example, can damage tissues and genetic material. Experts in science, engineering, medicine, health, and industry work with organization s to develop standards for exposure to RF energy. These standard s provide recommended levels of RF exposure for These recommended RF exposure levels include substantial margins of protection. All two-way radios marketed in Nort h America are designed, manufactured, and tested to ensure they meet government-established RF exposur e levels. In addition, manufacturers also recommend specific operating instructions to users of two-way radios. These instructions are important because they inform users about RF energy exposure and provide si mple procedures on how to control it. When two-way radios are used as a consequence of employment, the FCC requires users t o be fully aware of and able to control their exposure to meet occupational requirements. Exposure awareness can be facilitated by the use of a label directing users to specific user awareness information. The radi o has an R F exposure product label. Also, this Installation and Produc t Safety Manual and the applicable Operator’s Manual include information and operating instructions required to control RF exposure and to satisfy compliance requirements. 1.

3 COMPLIANCE WITH RF EXPOSURE STANDARDS The M7300 two-way mobile radio is designed and t ested to comply with a number of national and international standards and guidelines regarding huma n exposure to RF electromagnetic energy. In terms of measuring RF energy for compliance with the FCC exposure guidelines, the radio’s antenna radiates measurable RF energy only while it is transmitting (talking), not when it is receiving (listening), or in a standby mode. The M7300 two-way mobile radio complies with th e followin g RF energy exposure standards and guidelines. Radiofrequency Exposure Co mpliance of Radiocommunication Apparatus (All Frequency Bands). CAUTION Table 1-1 (for VHF radios) and Table 1-2 (for 700 and 800 MHz radios) list the recommended minimum safe lateral d istances for a controlled environment and for unaware bystanders in an uncontrolled e nvironment, from transmitting antennas (i.e., monopoles over a ground plane, or dipoles) at rated radio power for m obile radios installed in a vehicle. Transmit only when unaware bystanders are at least the uncontrolled recommended minimum safe lateral distance away from the transmitting antenna. Refer to Figure 6-1 on page 41 for applicable antenna part numbers. Installation guidelines presented in Se ction 6 are limited to metal-body motor vehicles or vehicles with appropriate ground planes. Unauthorized antennas, modifications, or attachments can cause the FCC RF exposure limits to be exceeded. 1.3.2 Approved Accessories The radio has been tested and meets FCC RF gu idelines when used wit h accessories supplied or designated for use with it. Use of other accessori es may not ensure co mpliance with the FCC’s RF exposure guidelines, and may violate FCC regulations.Always adhere to the following basic guidelines. The push-to-talk button should only be depressed when intending to send a voice message. ? The radio should only be used for necessary work-related co mmunications. ?

The radio should only be used by authorized and trained personnel. It shoul d never be operated by children. ? Do not attempt any unauthorized modification to the radio. The information listed above provides the user with info rmation needed to make him or her aware of a RF exposure, and what to do to assure that this radio ope rates within the FCC exposure limits of this radio. 1.5 COMMON HAZARDS The operator of any mobile radio should be aware of certain hazards common to the operation of vehicular radio transmissions. Possible hazards include but are not limited to. Explosive Atmospheres — Just as it is dangerous to fuel a vehicle while its engine is running, be sure to turn the radio OFF while fueling the vehicle. If the ra dio is mounted in the trunk of the vehicle, DO NOT carry containers of fuel in the trunk. Areas with potentially explosive atmosphere are ofte n, but not alway s, clearly marked. Turn the radio OFF when in any area with a potentially explosive at mosphere. It is rare, but not impossible that the radio or its accessories could generate sparks. ? Interference To Vehicula r Electronic Systems — Electronic fuel injection systems, electronic anti- skid braking systems, electronic cruise control syst ems, etc., are typical of the types of electronic devices that can malfunction due to the lack of protection from radio frequency (RF) energy present when transmitting. If the vehicle contains such equi pment, consult the dealer for the make of vehicle and enlist his aid in determining if such electr onic circuits perform normally when the radio is transmitting. ? Electric Blasting Caps — To prevent accidental det onation of electric blasting caps, DO NOT use two-way radios within 1000 feet (305 meters ) of blasting operations. Always obey the “ Turn Off Two-Way Radios ” (or equivalent) signs posted where elec tric blasting caps are being used. (OSHA Standard: 1926.900). ?

Radio Frequency Energy — To prevent burns or related physical injury from radio frequency energy, do not operate the transmitter when anyone ou tside of the vehicle is within the minimum safe Refer to Section 1.2 for additional inform ation. ? Vehicle s Powered By Liquefied Petroleum (LP) Gas — Radio installation in vehicles powered by liquefied petroleum gas, where the LP gas container is located in the trunk or other sealed-off space within the interior of the vehicle, must conform to the N ational F ire P rotection A ssociation standard NFPA 58. This requires: ? The space containing the radio equipment must be isolated by a seal from the space containing the LP gas container and its fittings. ? Outside filling connections must be used for the LP gas container. ? The LP gas container space shall be vented to the outside of the vehicle. ? Vehicles Equipped with Airbags — For driver and passenger safety, avoid mounting the radio’s control head (or any other component) above or near airbag deployment areas. In addition to driver- side and passenger-side front-impact airbags, some vehicles may also be equipped with side-i mpact airbags. For occupant safety, verify the location of all airbags within the vehicle before installing the radio equipment. 1.6 SAFE DRIVING RECOMMENDATIONS The American Automobile Association (AAA) advo cates the following key safe driving recommenda- tions. Read the literature on the safe operation of the radio. ? Keep both hands on the steering wheel and the micropho ne in its hanger whenever the vehicle is in motion. ? Place calls only when the vehicle is stopped. ? When talking from a moving vehicle is unavoidable, drive in the slower la ne. Keep conversations brief. ? If a conversation requires taking notes or comple x thought, stop the vehicle in a safe pl ace and continue the call. ? Whenever using a mobile radio, exercise caution. 1.

7 OPERATING RULES AND REGULATIONS Two-way radio systems must be operated in accor dan ce with the rules and regulations of the local, regional, or national government. In the United States, the M7300 mobile radio must be operated in accordance with the rules and regulations of the Federal Communications Commissi on (FCC). Operators of two-way radio equipment, must be thoroughly fam iliar with the rules that apply to the particular t ype of radio operation. Following these rules helps eliminate confusion, assures the most efficient use of the existing radio channels, and results in a smoothly functioning radio network. When using a two-way radio, remember these rules. It is a violation of FCC rules to interrupt any di stress or emergency message. The radio operates in much the same way as a telephone “party line.” Therefor e, always listen to make sure the channel is clear before transmitting. Emergency calls have priority over all other messages.The FCC requires keeping conversations brief and confined to business. Use coded messages whenever possible to save time. ? Using the radio to send personal m essages (except in an emergency) is a violati on of FCC rules. Send only essential messages. ? It is against Federal law to repeat or othe rwise make known anything ove rheard on the radio. Conversations between others sharing the channel must be regarded as confidential. ? The FCC requires self-identification at certain specific ti mes by means of call letters. Ref er to the rules that apply to the particular type of operation for the proper pr ocedure. ? No changes or adjustments shall be made to th e equipment except by an authorized or certified electronics technician. Operating the radio in areas of low terrain, or while under power lines or bridges. ? Obstructions such as mountains and buildings.

In areas where transmission or reception is poor, communication improvement may sometimes be obtained by moving a few yards in another direction, or moving to a higher elevation. See the appropriate Specifications Sheet for the com plete specifications. Procedures cover the mounting and cablin g of the equipment, as well as the basic in-vehicle test procedures. In additio n, product safety-related information is included. 3.1 GENERAL DESCRIPTION The M7300 mobile radio is a high- perform ance digital mobile radio. APCO Project 25 Phase I compliant Common Air Interface (P25 CAI) trunked radio networks. Talk-around communications in accordance with the APCO Project 25 Phase I standard; and. The radio also provides talk-around operation in the 764 to 767 MHz, 769 to 775 MHz and 773 to 776 MHz bands. In high-power transmit mode on a 700 MHz RF channel, the ra dio’s rated transmit output power is 19 watts. 800 MHz operating bands of the dual-band M7300 mobile radio include 806 t o 824 MHz repeater input band (mobile transmit) and the 851 to 869 MHz ba nd used for repeater output and talk-around communications. In high-power transmit mode on an 800 MHz RF channel, the radio’s rated transmit output power is 35 watts. 3.1.3 General Information The M7300 is designed to operate in a mobile environm ent, typically within a motor vehicle.In the front-mount configuration, the control head is an integral part of the mobile radio. In the remote-m ount configuration, the control head is located near the radio operator’ s position and t he radio is mounted remotely from the control head, typically in the vehicle’s trunk. As described later in this section, a HHC-731 hand-held controller can be connected to a remote-mount radio, in place of the CH-721 control head. The remote- mount radio is shown in Figure 5-3 on page 37. Control head s used with the M7300 radio include the CH-721 Scan and the CH-721 System m odel control heads. See Figure 8-5 (page 67) through Figu re 8-7 (page 68).

In a remote-mount M7300 m obile radio installation, the HHC-731 hand-held controller can be used in place of the CH-721 control head. This easy-to-use hand-held mobile radio controller is primarily designed for use in harsh environm ents such as mar itime (i.e., boating) appli cations and All-Terrain Vehicle (ATV) applications. The HHC-731 hand-held controller has easy-to-use buttons, a tough liquid- crystal display (LCD), and a built-in microphone. As of the publication of this manual, only one (1) HHC-731 hand-held controller can be connected to a radio, and without any connected CH-721 control heads. The front of the HHC-731 hand-held controller is shown in Figure 8-14 on page 77. The rem ote-mount M7300 radio is designed for remote mounting in a motor vehicle’s trunk, or some other preferably unoccupied section in a vehicle, such as a fire t ruck’s equipment shelf. Up to four (4) control heads can be connected to a front-mount M7300, and up to five (5) control heads can be connected to a remote-mount M7300. The radio is re m otely controlled by a control head(s) connected to it via 3-wire Controller Area Network (CAN) cables. Between the radio and control head(s), the CAN link carries digitized microphone and speaker audio, controlling data such as button presses and radio messages, and user data such as that for a mobile data terminal connected to the serial port of the radio or control head. For proper operation, the CAN link must be terminated appropriately on each end. In multiple control head installations, two or m o re contro l heads are interconnected to the mobile radio in a series (“daisy-chain”) fashion via CAN link cables. As shown in Figure 8-7 on page 68, th e CH-721 Scan and System model control heads used in rem ote- m ount radio installations have several connectors lo cated on t he head’s rear panel.

These connectors include a DC power connector, two (2) CAN port c onnectors used for CAN link interconnections, an external speaker connector, a 9-pin serial port conn ector for connecting optional equipm ent such as a mobile data terminal, and a 25-pin accessory connector. In mobile applications, the motor vehicl e’s electrical system is utilized as the source of DC power. In a remote-mount radio installation, the CH-721 control head(s) or the HHC-731 hand-held controller connected to the radio is also powered by the same DC power source, but separately fused. The radio provides half-duplex voice and data co mmunications. Voice communications are accomplished via a “push-to-talk” (PTT) type microphone and an ex ternal speaker connected to the control head. When a control head is When the hand- held controller is employed, an audio amplifier in the r emote-mounted mobile radio drives the speaker. For data communications, the radio has an industr y- standard 9-pin serial interface port for connecting optional data-type equipment, such as a Mobile Data Terminal (MDT), a laptop PC, an external display, or a key-entry device. This port works seamlessly with equipment from popular manufacturers and off- the-shelf applications. The radio has an optional built-in Global Positioni ng System (GPS) tracking receiver. On an OpenSky trunked radio network, the GPS tracking receive r can provi de quick and accurate unit location information to dispatchers via the radio network. The GPS receiver determines the unit’s location and the radio transmits it to the network, either when polle d by the network or autom atically on a predetermined periodic basis. TDMA allows multiple radio users to share a single RF channel. In addition, a single RF cha nnel can support simultaneous digital voice and data communications.

When operating on an OpenSky radio network, AMBE gives an M7300 the ability to provide exceptional voice quality via the lim ited bandwidth of the radio frequency path, even when the received RF signal is weak (i.e., even in “fringe” areas). AMBE is performed by a Digital Signal Processor (DSP) integrat ed circuit within the radio programmed to perform an AMBE compression algorithm during m obile tr ansmissions, and an AMBE expansion algorithm during mobile reception. The M7300 mobile radio supports operation on APCO Project 25 phase I compliant Common Air Interface (P25 CAI) trunked radio networks, and opera tion in a talk-around m ode in accordance with the APCO Project 25 phase I standard. P25 radio s y stems utilize Improved Multi-Band Excitation (IMBE) speech and data compression technology, also developed by Digital Voice Systems, Inc. Like AMBE technology, IMBE technology allows the M7300 to deliver exceptional voice quality, even in areas where the received RF signal strength is w eak. IMBE replicates hu man speech better than other voice compression technologies, resulting in better voice quality and better speaker r ecognition. The Telecommunications Industry Association (TIA) funded an independent study to evaluate co mpression technologies. The findings showed that when comp ared with other industry-recognized compression technologies, IMBE provided the highest voice quality. In the stu dy, radio users were asked to listen to coded speech produced by four different compressi on technologies (i.e., vocoder circuits) operating under a variety of conditions. The users rated the speech on a scale of one to five, with five being the best quality. Under each operating cond itions, IMBE was rated the best. The M7300 mobile radio can also operate using Harr is’ digital voice technology called ProVoice. Like P25 radio systems, ProVoice also em ploys IMBE technology. Data is transmitted on an RF channel at a 9600 bits-per-second rate.

CAUTION Harris recommends the buyer use on ly an au thorized representative to install and service this product. The warranties provided to the buye r under the terms of sale shall be null and void if this pr oduct is installe d or serviced improperly, and Harris shall have no further obligation to the bu yer for any damage caused to the prod uct or to any person or personal property. 3.2 RELATED PUBLICATIONS The following publications contain additiona l information about the M7300 mobile radio. Quick Guide for OpenSky mode: MM-014368-001. Quick Guide for EDACS, Conventional and P25 (ECP) modes: MM-014369-001. Operator’s Manual for all modes: MM-014716-001. Operator’s Manual for HHC-731 hand-held controller: MM-018321-001. Maintenance Manual for VHF radio (includes CH-721 maintenance manual): MM-017065-001. Maintenance Manual for 700 and 800 MHz radio (includes CH-721 maintenance manual): MM-014718-001 Both quick guides are included with each mobile radi o equipment package when it ships from the factory. Operator manuals, installation manuals, maintena nce manuals, and quick guides are available at www.pspc.harris.com via a Information Center login and Tech Link. 3.3 REPLACEMENT PARTS Replacement parts can be ordered through the Custom er Resource Center. To order replacement parts through the Customer Resource Center, call, fax or e-mail our ordering system: United States and Canada. Phone Number: 1-800-368-3277 (toll free). Fax Number: 1-800-833-7592 (toll free). Phone Number: 1-434-455-6403. Fax Number: 1-434-455-6676.United States and Canada: 1-800-528-7711 (toll free). International: 1-434-385-2400. Fax: 1-434-455-6712.In som e cases, the radio may be supplied with a HHC-731 hand-held controller instead of a CH-721 control head and a microphone. In this case, the HHC- 731 hand-held controller and all installation-related components for the radio and the controller are supplied with kit M AMW-NCP9P, as listed in Table 4-6.

Since this kit includes radio installation-related co mponents, standard Insta llation Kits MAMW-NZN6W or MAMW-NZN7R are not required.If any are noted, contact the Customer Resource Center (see page 22) immediately to discuss and arrange the return of the equipment to Harris for replacement. Any unauthorized attempts to repair or modify this equipment will void the warrant y and could create a safety hazard. Upon removing items from the carton and verifying that all equipment is accounted for, proceed with the installation.Includes 10-AWG, 20-F oot DC Power Cable with straight connector, (2) waterp roof HFB fuse holders, (1) 20-am p AGC fuse, (1) 15-amp AGC fuse and (1 ) 3-amp AGC fuse. See CAUTI ON that follows. See Section 7.2 on page 51. 3 2 ? CD-014027- 001 Terminator, CAN; 3-Pin, Straight Body. See Section 11.1 (page 87). 6 1 ? FM-104859- 001 Cap, Waterproof (For covering M7300’s DB-9 serial port connecto r). See Section 8.1 on pag e 57. 2 1 ? KT-008608 Kit, CH-721 Mounting Bracket. Includes 10-AWG, 20-Foot DC Power Cable with straight connector, (2) waterp roof HFB fuse holders, (1) 20-amp AGC fuse, (1) 15-amp AGC fuse and (1) 3-amp AGC fu se. Includes 12-A WG, 10-foot DC Power Cabl e with straight connector, (2) waterp roof HFB fuse holders, ( 1) 3-amp AGC fuse, and (1) 5-amp AGC fuse. See Section 8.3.4 on page 73. 5 2 ? CD-014027- 001 Terminator, CAN; 3-Pin, Straight Body. See Section 8.3.3.2 on page 72. M7300 radio main power should be protected with the 15-amp fuse. Refer to Section 13 for additional inform ation. 4 Earlier installation kits contained only on e (1) each of FM-104859- 001 and FM -104859-002. CA-018399-001 Cable, HHC-731 Interface 3 1. KT-018752-001 Kit, HH C -7 3 1 Interface Cable Bracket 4 1. KT23117 Kit, Remote-Mount Mobile Radio Mounting Bracket. Includes 10-AWG, 20-Foot DC Power Cable with straight connector, (2) waterpro of HFB fuse holders, (1) 20-amp AGC fuse, (1) 15-amp AGC fuse and (1) 3-amp AGC fuse.

S ee the CAUTION on page 28 and Section 8.2 on page 61. See Section 8.4.3 on page 80. 7 1 ? CD-014027-001 Terminator, CAN; 3-Pin, Straight Body. See Section 8.4.2 on page 79. 8 1 ? CA-009562-030 Cable, CAN; 30 feet, Right-Angle- to-Straight Connectors. See Section 8.4.2 on page 79. 9 1 ? LS102824V10 Speaker, External Mobile; 20-Watt (with 4.6-foot cable). See Section 9.2.2 on page 85. 10 1 ? CA-012349-007 Cable, Speaker-Only Option, 20-feet. See Section 9.2.2 on page 85. 11 1 ? FM-104859-002 Cap, Waterproof (For HH C -7 31 In t e r fa c e Cable’s D B-25 option connector.) CAUTION The 20-amp fuse included with DC Power Cable CA-012365-001 should not be used in the M7300 mobile radio application of this cable. M7300 radio main power should be protected with the 15-amp fuse. Refer to Section 13 for additional inform ation. Includes CH-721 Conversion Kit, CH-721 Mo unting Bracket Kit, CH-721 DC Power Cabl e, CAN Cable, CAN Terminat or, Speaker Cable, Etc.Includes Pedestal Mount and Mounting Screws MACDOS0013-CN004 Kit, Speaker; 20-Watt, Straight Connecto r. (Includes 4-Oh m 20-Watt Speaker LS102824V10 with 4.6-Foot Cable a nd 6-Inch Speaker Cable MAMROS0 034- NN006.) FS24473 Kit, Vehicle Fuse and T-Tap. Includes (1) ATM Fuse Hold er, (1) 2-Amp ATM Fuse, (2) T-Tap Quick-Discon nect Terminals and (1 ) ?-Inch Crimp Tab T erminal. (Contents shown in Figure 8-12 on pag e 76.) MC-101616-040 (Discontinued.Be fore starting, plan the installation carefully so it will meet the following requirem ents. The installation is safe for the operator and passengers within the vehicle. ? The equipment is installed away from the airbag deployment areas. ? The installation allows for convenient access by the op erator, as applicable (i.e., the control head or hand-held controller). ? The equipment is protected from water damage. ? The installation is neat and allows easy service access. ?

The mobile radio is mounted in a location assuring the vehicle occupant’s safety and out of the way of passengers and auto mechanics. CAUTION A professional radio installer should perform the installation! 5.2 TOOLS REQUIRED The following tools are recommended to complete the installation. Where specific vendor names and model or part numbers are given, equivalent substitutes may be used. Insulated Terminal Crimp Tool: Klein 1005 ? 4-Millimeter Hex Key Wrench. Ratcheting Hex-Crimp Tool for 50-Ohm TNC and BNC RF Connectors and RG-58 Cable similar to Tyco Electronics 58433-2 (includes Crimper 354940-1 and Die Set 58436-1) or Emerson Network Power 24-9960P. Clutch-Type Cordless Drill with Drill Bits and Driver Bits. Deburring Tool (for ? -inch and smaller holes). Flush-Cut and Large Wire Cutters. Non-Metallic Fish Tape, 25-Foot: Klein-Lite 50156. Various Fasteners (e.g., machine screws and nuts, Tek screws, etc.) ? Various Socket and Driver Sets. Tie Wraps: Nylon, 6-inches or larger. Soft-Jaw Pliers: Tessco 450520 or equivalent A separate list of test equipment is included in Section 14.2 on page 100. Particularly consider the connection of the radio for planning purposes. ? Determine the customer’s preferen ces, if any, for location of components. Comply with these preferences as long as they are consistent with safety recommendations and guidelines presented in this manual, and other ge nerally accepted professional radio installation practices. ? For a front-mount installation, the radio is typicall y located under the vehicle’ s dash panel. Dimensions for the radio, control head, and ha nd-held controller are listed in Section 2.1 on page 16. As noted in that section, these dimensions do not include space required at the rear of the radio for cables. Several inches of clearance space is required. ?