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Philips PRM80 Series User Manual

Vhf/uhf mobile radio
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PRM80 SERIES VHF/UHF MOBILE
RADIO TELEPHONE
The transistors used in the transmitter power amplifier contain beryllium
oxide, the dust of which Is toxic.
No danger can arise from normal handling, but no attempt should be
made to tamper with the encapsulation of these devices. They must not
be discarded with Industrial or domestic waste.
Publication Ref. 9585 666 80000
Issue B. - November, 1989.
This handbook Is for the maintenance of telecommunication equipment. The performance
figures quoted are typical and are subject to normal manufacturing and service tolerances.
The right Is reserved to alter the equipment or specifications In the light of technical
development.
This publication Is copyright and no part may be reproduced or copied without the prior
permission of Philips Radio Communication Systems (Australia) .
Philips Radio Communication Systems
Box 105, Clayton, Victoria, Australia, 3168. Telephone: (03) 542 4500
Telex: AA20165 (PHILIND) AUSCLTW+ FAX: (03) 543 7935
WARNING
PHILIPS
Printed in

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  • Page 1 The right Is reserved to alter the equipment or specifications In the light of technical development. This publication Is copyright and no part may be reproduced or copied without the prior permission of Philips Radio Communication Systems (Australia) . Philips Radio Communication Systems Box 105, Clayton, Victoria, Australia, 3168. Telephone: (03) 542 4500...

  • Page 2: Table Of Contents

    SECTION 1 INTRODUCTION Section 1 Page PRODUCT DESCRIPTION TABLE OF CONTENTS 1.1.1 Product Variants 1.1.2 Product Family MECHANICAL CONSTRUCTION SERVICE/ACCESSIBILITY SALES CODES 1.4.1 The 12-digit Sales Code 1.4.2 The 20-digit Supplementary Technical Code OPERATING INSTRUCTIONS 1.5.1 Safety First 1.5.2 Advice to User 1.5.3 Introduction 1.5.4...
  • Page 3 SECTION 4 ALIGNMENT PROCEDURE Section 4 Page TEST EQUIPMENT GENERAL INSTRUCTIONS PRELIMINARY ADJUSTMENTS TEST FREQUENCY TABLE 4.4.1 Selcall Encode Test THE PROCEDURE 4.5.1 VCO Alignment 4.5.2 Transmitter Power Adjustment 4.5.3 Reference Oscillator Tuning 4.5.4 UHF Receiver Front End Alignment 4.5.5 VHF Receiver Front End Alignment 4.5.6 Mute Maximum Alignment...

  • Page 4: Section 1 Introduction

    SECTION 1 INTRODUCTION PRODUCT DESCRIPTION The PRM80 series of mobile radio transceivers are primarily, under dash mounted local controlled simplex radios, for vehicular application. The design concept utilises an advanced microcomputer controlled frequency synthesizer. The microcomputer also performs analogue signalling. The selective calling systems provided meet the requirements of both standard despatch communications and special systems applications in world-wide private mobile radio markets.

  • Page 5: Product Family

    Transmitter Power 1 to 6 watt, 1 to 25 watt, 10 to 40 watt. (Different printed circuit board assemblies required for each option). iii) Frequency Band EO band, A9 band/BO band, Tm band, UO band, W 1 band, W4 band. (Different printed circuit board assemblies required for each band).

  • Page 6: Mechanical Construction

    Large loudspeaker vii) Depot Data programmer. viii) 24 volt to 12 volt do to do converter. Interference filter (12 volt do power). MECHANICAL CONSTRUCTION The main transceiver unit contains three printed circuit boards. Each are double sided epoxy fibreglass with plated through holes. Extensive use is made of surface mounted components but conventional leaded components are also used.

  • Page 7: Service/Accessibility

    The front panel assembly is attached to the outer sleeve and a dust and water seal gasket is provided at this interface. The antenna connection is provided by a chassis mounted BNC type socket at the rear of the main chassis. Connection to the loud speaker and do power is provided by a 4-way connector socket mounted on the control PCB, and is accessed at the rear of the main chassis.

  • Page 8: Sales Codes

    The control board may then be removed from the chassis but it remains connected to the radio PCB and front panel by a flexible interconnecting circuit-Care must be exercised when re-attaching a control PCB to the chassis, to ensure that the 5V regulator, IC208, has the insulating washer and bush correctly fitted.
  • Page 10 Version Mic. Mute Provisional Band Power Blanke ment onal Stab tion Switch Spacin (MHz) (Watts) Signall Signalli Label Stand Philips Variab No kit. fitted. fitted. require require fitted- fitted. conne 1 to Swivel Bypas PRM8 Selcall Stand Stand None Fitted.

  • Page 12: Safety First

    1.5.1 Safety First The use of the mobile radio while driving may be in breach of traffic regulations in some countries. Check with your local Traffic Authority for further details. Please do not use a hand-held microphone while you are driving. DO NOT operate the mobile radio in an explosive atmosphere.

  • Page 13: Introduction

    1.5.3 Introduction The Type PRM8010 transceiver is a versatile, microprocessor-controlled, dash-mounted, mobile radio designed to access facilities provided by the Private Mobile Radio Service. The transceiver is software programmable to produce the options required to suit specific requirements. Though many options are available, each unit is dispatched from the factory programmed with a specific software application package, so that only a few parameters need to be varied in the field (eg.

  • Page 14: Other Functions

    Adjust the 'volume' control until receiver noise is heard. The volume control adjusts the speech level at the loudspeaker. Clockwise rotation increases the volume, anti-clockwise rotation decreases the volume. Turn 'squelch' control clockwise just until the receiver noise disappears. Note that this is the most sensitive setting of the squelch control. Turning the squelch control further clockwise will suppress weak interfering signals.
  • Page 15 If the equipment is fitted with CTCSS and/or selective calling, the busy indicator and the transmit inhibit facility are both defeated whenever a valid call is received, so that you can respond to the call. 1.5.5.2 TRANSMIT LIMIT TIMER The transmit limit timer limits the duration of the transmission. The transmission time may be set, in steps of one second, from 1 to 255 seconds.

  • Page 16: Scanning Functions

    If the microphone is removed from its cradle while the transceiver is still scanning, the priority channel will be selected. The channel display will 1.5.6 Scanning Functions When fitted this option allows a mobile to scan a number of radio channels for a valid signal. There can be up to 9 channels in a scan group and one of these can be designated as a Priority channel.

  • Page 17: Selective Call Facilities

    The mobile will return to the channel that was selected before the scan function was initiated. 1.5.6.2 SELECTION OF PRIORITY CHANNEL (if enabled) Select the required channel by using 'Channel UP' button. Use the 'SCAN' button to initiate scanning. The channel selected will automatically become the priority channel. Note: The 'ERROR TONE' will sound if the channel that is selected is not permitted as a scan channel.
  • Page 18 1.5.7.4 EXTERNAL ALERT This button is used to control an external device, such as the vehicle horn. It is normally switched on when you expect to be outside your vehicle and it will be activated, whenever your equipment receives a valid call. 1.5.7.5 MONITOR / RESET This button can be programmed to enable you to listen to all calls on the channel.

  • Page 19: Alert Tones

    1.5.8 Alert Tones The frequency of all 'alert tones' is 500Hz. TYPE OF ALERT ERROR Generated when operator TONE presses an invalid button. CONTINUO Generated on Invalid TONE of PTT, or If microphone left ERROR of cradle Generated when any button Is BEEP pressed.

  • Page 20: Equipment Data Sheet

    1.5.9 Equipment Data Sheet An individual data sheet listing all transmitter and receiver frequencies, including signalling information, is supplied with each transceiver. It is important that this data sheet is retained for future use such as the equipment requiring repair or change to parameters (eg.

  • Page 21: Section 2 Technical Specifications

    SECTION 2 TECHNICAL SPECIFICATIONS Unless otherwise stated, specifications apply for an ambient temperature of 25 Deg C and 13.8V supply. GENERAL Operation Single- or two-frequency simplex. Modulation Frequency. Supply Voltage 10.8V to 16.2V dc, negative earthed to chassis. Frequency Bands E0 68 - 88 MHz Tm 400 - 440 MHz B0 132 - 156 MHz...
  • Page 22 Switching Bandwidth Frequency band coverage without retuning TM 40MHz, U0 30MHz, W 1 30MHz, W4 20MHz A9/B0 band 30MHz E0 band 20MHz Channel Capacity i) 9-channel ii) 64-channel Current Consumption Off state less than 10mA less than 350mA Rx standby less than 10mA less than 350mA (no AF output)

  • Page 23: Receiver

    RECEIVER Sensitivity 12dB sinad for less than 0.31uV pd. at the antenna socket, for 1 kHz at 60% maximum deviation and 50% rated AF output power. Adjacent Channel Selectivity DOC method Greater than 4.1mV pd (73dB wrt 0.31uV). Greater than 5 mV pd (74dB wrt 0.31uV). Intermodulation Rejection Ratio Three generator method, greater than 75dB at 100200kHz above and below carrier to avoid selectivity limitations.

  • Page 24: Transmitter

    Audio Frequency Response Measured at the loud speaker for a constant deviation at 20% of maximum. Within +l dB to -3dB of -6dB per octave de-emphasis relative to 1 kHz over 300Hz to 3000Hz, CTCSS not fitted. With CTCSS fitted within +1.5 to -3dB. Audio Output 4 watts into 4 ohms, less than 10% THD with 1kHz at 60% maximum deviation.

  • Page 25: Signalling

    Audio Frequency Response 25kHz Channel Spacing. Within +1 to -3dB of a +6dB per octave pre-emphasis, over 300 to 3000Hz (without CTCSS). With CTCSS, within +1.5 to -3dB. 12.5kHz Channel Spacing. Within +1 to -3dB over 300 to 2550Hz (without CTCSS). Within +1.5 to -3dB over 300 to 2550Hz (with CTCSS).
  • Page 26 (vii) Lead-in-Delay. 0 to 65Sec. Accuracy greater than 1%. (viii) Lead-out-Delay. 0 to 255mSec. Accuracy greater than +0, -1 mSec. (ix)Send Repeat Rate. Approx 100mSec following end of transmission. Additional send keystrokes are ignored during encode. (x)Code Formats. Up to 10 tones per sequence. 2.4.1.2 Decoder Sinad Sensitivity.

  • Page 27: Prm80 Ctcss Specification

    (iv) Valid Tone Period for Successful Decode. 80% deviation and full quieting. -40% to +70% Code Format. A successful decode will occur if the correct code address is preceded with and/or followed by erroneous tones or noise. (vi) Decode Recognition. Upon receipt of correct decode address, no action occurs (ie mute open, auto acknowledge, etc) until approximately one tone period has elapsed.
  • Page 28 (ii) Software RTB. RTB phase shift: 180 degrees +/- 10 degrees, lagging. RTB duration: between 80mSec to 150mSec. CTCSS tone frequency dependent. See Table 2.1 RTB amplitude variation 0.5dB. (across CTCSS tone set). 2.4.2.3 Decoder Tone-Set. as per Encoder. (ii) Bandwidth.
  • Page 29 Table 2.1 CTCSS Tonesets Available In the PRM80 R.T.B. Duration FREQ. (Hz) Tone Number (mSec) (disabled) ---- 67.0Hz 71.9 Hz 74.4 Hz 77.0 Hz 79.7 Hz 82.5 Hz 85.4 Hz 88.5 Hz 91.5 Hz 94.8 Hz 97.4 Hz 100.0 Hz 103.5 Hz 107.2 Hz 110.9 Hz...
  • Page 30 TABLE 2.2 Selcall Tonesets Available In the PRM80 Manucturer s TONE ST-500 SIG TEC SIG TEC SEPAC ST-500 0 SIG TEC Type N International CCIR CCIR CCIR CCIRH CCIR System No.- 1981 1981 1981 1981 1981 1981 1981 1981 1124 1124 1124 1124...

  • Page 31: Section 3 Technical Description

    SECTION 3 TECHNICAL DESCRIPTION GENERAL OVERVIEW Shown in figure 3.1 is the overall simplified block diagram of the PRM80. Figure 3.1 PRM80 - Overall Block Diagram The transceiver consists of three printed circuit board assemblies. Front Panel Board Containing the liquid crystal display, its driving circuit, push button switches and display backlighting.

  • Page 32: Receiver

    iii) Radio Board Containing the transmitter power amplifier with antenna switch, receiver front end filters and mixer, receiver IF and demodulator, synthesizer and reference oscillator, transmit and receive voltage controlled oscillators, and transmitter audio low pass filter. All the frequency band and channel spacing related components are on this board assembly.

  • Page 33: Synthesizer

    an amplitude limiter stage. Following the limiter the signal is low pass filtered prior to modulating the transmit VCO. Provision is made to combine microphone and signalling audio. 3.1.3 Synthesizer The frequency synthesizer provides the functions of excitation for the transmitter power amplifier, and the receiver first local oscillator.

  • Page 34: Power Supply And Reset

    The CTCSS encode and decode function is performed in a single integrated circuit. The IC is controlled by the microprocessor. The encoder/decoder IC also provides a high pass filter when in receive mode to remove the demodulated tone ahead of the audio power amplifier, and in transmit mode to reject low frequency microphone audio prior to modulating the transmit VCO.

  • Page 35: Detailed Technical Description

    DETAILED TECHNICAL DESCRIPTION 3.2.1 Receiver 3.2.1.1 GENERAL The double conversion receiver design is intended for narrow band frequency modulation systems only. Figure 3.2 shows the simplified block diagram of the receiver excluding the final stages of audio processing. 3.2.1.2 FRONT END 3.2.1.2.1 UHF Section The UHF front end filter utilizes five ceramic coaxial resonators which are effectively quarter-...
  • Page 36 required for the total front end filtering are mechanically pre-aligned by the tuning cores, but once set require no further readjustment. Conversion to the first IF frequency of 21.4MHz is achieved with the double balanced ring diode mixer U400. 3.2.1.3 IF SECTION Following the double balanced mixer module U400, an IF pre-amplifier, TR401, provides additional IF gain and also presents a suitable impedance match to the crystal filter FL403.
  • Page 37 3.2.1.4.1 Path 1. In this path the signal is first attenuated by approximately lOdB with resistors R221 and 8222 on the control board. This is to reduce the AF level into IC204 (the CTCSS decoder and high pass filter), which requires a lower AF level for correct operation. If IC204 is not fitted the option is bypassed by the link 8249, and the signal is then filtered by one stage of the dual OP AMP IC201.

  • Page 38: Transmitter

    3.2.1.4.3 Path 3. The final path for the demodulated receive audio, is to the pre-processing circuit for the tone sequential signalling decoder. The signal path of the demodulated audio may also be broken to include the noise blanker circuit option fitted to SK401. When this is done R440 is deleted. The fourth stage of OP AMP IC401 is used to provide a regulated bias voltage for the other three OP AMPs within this IC.
  • Page 39 The action of this power control loop is to stabilize the output power for a normally matched load. For a load mismatch condition at the transmitter output, a standing wave will result which causes a higher potential to appear at one end of the quarter-wave transmission section. This will cause a higher detected feedback voltage for the same transmitter power setting.
  • Page 40 that 25 watts are available at the antenna socket. Broadband impedance matching circuits are used between all stages with extensive use of printed microstrip. The output power is stabilized by a power control feedback loop. The power detector consists of a PI-section equivalent quarter-wave transmission line using L432, C594 and C597. The detector is realized by D438 and C593.
  • Page 41 3.2.2.2 TRANSMIT AUDIO PROCESSING The majority of the transmit audio circuitry is located on the control PCB. The primary input is at PIN 8 of the microphone input socket SK201. The active microphone derives its power source from the transceiver via the emitter follower transistor TR229. This transistor provides a well decoupled, low noise do supply by effectively amplifying the base capacitance of C301.

  • Page 42: Synthesizer

    On the radio PCB is the final stage of transmit audio processing. The UHF issue C version of this board uses a discrete transistor active low pass filter realized by transistors TR415, and TR416. This filter is a fourth order low pass with a 3kHz cutoff frequency set by C545, C547, C548 and C549.
  • Page 43 If the programmable divider value of N is increased by 1 to N+1, then for phase lock to occur Fo'/N+1 = Fr, where Fo' is the new VCO frequency. By simple transposition of this equation it can be shown that Fo' = Fo+Fr. Therefore, by setting Fr to equal the channel spacing, it is possible to select a particular channel by choosing the appropriate value for N, providing of course that the required frequency is within the electronic tuning range of the VCO.
  • Page 44 The prescaler is a dual modulus type with programmable division ratios of either 64 or 65. If the prescaler were of the fixed division ratio type (eg: divide by 64), then the frequency steps that may be programmed by incrementing the programmable divider by 1 would be in steps of 64;...
  • Page 45 The loop filter OP AMP do supply is produced by a voltage tripler circuit on the control board. This 23 volt supply enables the loop filter output to control the varicap diodes of the VCO and receiver front end over a wide capacitance range. Using the higher control voltage on the varicaps is preferred to using tighter varicap coupling, which would result in noise degradation.
  • Page 46 3.2.3.7 VOLTAGE CONTROLLED OSCILLATORS The UHF voltage controlled oscillators for the transmitter excitation, and the receiver local oscillator function, make use of ceramic coaxial resonators. These resonators are, effectively, a quarter-wave transmission line with one end short circuited. The other end of the resonator appears electrically as a parallel L-C tuned circuit with a very high Q.

  • Page 47: Central Control

    output produced by each buffered VCO is sufficient to drive the synthesizer frequency divider and the other following circuits, (mixer for the receiver and the transmitter power amplifier). The VCO and buffer stages for both transmit and receive oscillators, are housed in separate screened compartments which are provided by the diecast radio screen.
  • Page 48 A low current +5V regulator operates permanently to supply the microprocessor internal RAM. The microprocessor derives its power from the +5.2V regulated source via D216, the remaining logic controlled devices are supplied power via D221. The nominal +5V regulator has its output boosted to 6 volt by means of the voltage divider R336 and R337 and the diode D215.
  • Page 49 The circuit requires several changes of state of the switching transistors before the output voltage reaches +23V However, assuming a loss-less circuit with the oscillation starting with TR201 conducting and TR200 off, then all capacitors C202, 0203, C205, C206 are charged to approximately +9V On the second cycle when TR200 is on with TR201 off, both C205 and C206 have their charge pumped to +18 volt due to the charge transfer from C202 and C203 respectively.
  • Page 50 When the primary supply voltage drops below 9.8V, the voltage drop across D225 allows R300 to forward bias TR224. TR224 and TR232 form a Schmitt trigger with R395 providing hysteresis and C302 providing speed up. As TR224 collector voltage rises, TR232 also conducts, reinforcing TR224 forward bias.
  • Page 51 3.2.4.5 RADIO INTERFACE TO MICROPROCESSOR The interface between the radio system and the microprocessor occurs in three ways, by the microprocessor directly, by the microprocessor serial control bus, or by the serial latch IC207. The microprocessor port connections are configured as either; inputs only, outputs only, or, in the case of the serial bus, as a bi-directional port.
  • Page 52 Port 1 of the control processor is primarily the serial control port which controls the various serial control devices within the mobile. P1.0 is the serial data line. This line may be used as either an input or an output depending on which serial device the control processor is communicating with.
  • Page 53 P3.0 is the serial programmer receive data line. P3.1 is the serial programmer transmit data line. P3.2 is the low volts interrupt input. When the supply voltage to the mobile drops below 9.8 volts this pin will go to a logic low level. P3.3 is the analogue signalling interrupt input pin.
  • Page 54 3.2.4.7 SERIAL CONTROL BUS The serial control bus is used for control of the following devices; EEPROM, display driver, CTCSS encoder/decoder, serial latch and the RF synthesizer. Each of the serial devices is accessed by asserting an enable line and then serially clocking the data into the chip.The control of each device is as follows: 3.2.4.7.1 EEPROM...
  • Page 55 the display, whilst the 64-channel variant utilises both back planes and thus requires two groups of data. Note the period of the serial clock when addressing the display driver is approx 10 times greater than that required for the other serial devices. 3.2.4.7.3 CTCSS encoder/decoder The CTCSS encoder/decoder is programmed in the period following the synthesizer...

  • Page 56: Front Panel

    During encode operation the output ports P2.5, P2.6 and P2.7 are controlled by the microprocessor. The outputs from these ports are combined by the summing network consisting of R267, R268 and 8269. This signal is then integrated and filtered by IC205d and its associated components.
  • Page 57 Scan Button Chevron LCD 1 is electrically connected to the driver integrated circuit IC 100 by a zebra strip. This IC contains an internal clock with the frequency set by resistor R104 and capacitor C100. This clock provides the strobe for the backplane of the LCD.Display information is programmed into the driver IC from the control microprocessor.
  • Page 58 One position is unused in the 64-channel variant. In operation each column line is, in turn, set to a logic low level. As each column is scanned the row lines are read by the port 0 lines to determine if any keys on that particular column have been pressed. This occurs for each of the three rows and the control program is then able to determine which key has been pressed and what action to take.

  • Page 59: Section 4 Alignment Procedure

    Marconi transceiver test set model 2995. Power supply 13.8 volt at 10 amp Kenwood PD35-20 or PS775. iii) CRO Philips PM3055 (greater than 20MHz BW). DVM Fluke 77 or similar GENERAL INSTRUCTIONS The alignment of the PRM80 is performed using the EEPROM customization memory programmed with the standard test and alignment information.

  • Page 60: Test Frequency Table

    TEST FREQUENCY TABLE NOTE; The appropriate table of information should be programmed into the transceiver. Test Frequency OPTION DETAILS Frequency Channel (MHz) Transmit Band Number CTCSS (MHz) Selcall 68.025 68.525 68 to 88 78.025 78.525 87.025 87.525 68.025 68.525 107.2Hz 78.025 78.525 107.2Hz...

  • Page 61: Selcall Encode Test

    Frequency Channel Test Frequency OPTION DETAILS Band Number (MHz) (MHz) Transmit CTCSS Selcall Power ENC/DEC 470.025 470.525 470 to 500 485.025 485.525 499.025 499.525 470.025 470.525 107.2Hz 485.025 485.525 107.2Hz 499.025 499.525 107.2Hz ENC test tone 500.025 500.525 500 to 520 510.025 510.525 519.025...

  • Page 62: The Procedure

    THE PROCEDURE 4.5.1 VCO Alignment 4.5.1.1 VHF RECEIVE VCO Step Result Result Adjust Result Notes Measured by Measured at Switch on power Highest freq. Select ch. 3.. channel. DVM, dc TP402 L407 15.0 +10.2V volt, range DVM, dc Lowest freq. TP402 Select channel 1 3.OV to 5.OV volt.

  • Page 63: Reference Oscillator Tuning

    4.5.2 Transmitter Power Adjustment (Continued) Step Result Result Adjust Result Notes Measured by Measured at do supply <6.5A (UHF) Checks 4 Ammeter input <5.5A (VHF) current consumption Ensures Tx indicator 5 LC Display is operating Disable PTT Mid freq. channel for select ch.

  • Page 64: Uhf Receiver Front End Alignment

    4.5.4 UHF Receiver Front End Alignment Step Result Result Adjust Result Notes Measured by Measured at Switch on power and select channel Lowest freq. channel. 50uV pd level Modulate generator Antenna RF sig. gen. and freq. for with 1 kHz at 60% of socket SK402 output..

  • Page 65: Vhf Receiver Front End Alignment

    4.5.5 VHF Receiver Front End Alignment Step Result Result Adjust Result Notes Measured by Measured at Switch on power Highest freq. and select channel. channel 3. Modulate generator Antenna RF sig. gen. 50uV pd., and with 1 kHz at 60% of socket SK403 output.

  • Page 66: Mute Maximum Alignment

    4.5.5 VHF Receiver Front End Alignment (Continued) Step Result Result Adjust Result Notes Measured by Measured at RF sig. gen. 0.31 uV pd output. level. Speaker Greater SINAD output at than 12dB Verifies alignment meter SK202. SINAD. 4.5.6 Mute Maximum Alignment Step Result Result...

  • Page 67: Transmit Modulation Alignment (No Ctcss)

    4.5.7 Transmit Modulation Alignment (No CTCSS) Step Result Result Adjust Result Notes Measured by Measured at Switch on power Select ch.2 on VHF select ch. Select ch.3 on UHF Microphone 1 kHz at AF sig. gen. socket SK201 400+/- 40mV output PIN 8 Activate PTT...

  • Page 68: Transmit Modulation Alignment With Ctcss

    4.5.7 Transmit Modulation Alignment (No CTCSS)(Continued) Step Result Result Adjust Result Notes Measured by Measured at a) 25/30kHz channel spacing a)+/- 4.8kHz +0/-0.2 b) 20kHz channel Deviation Antenna b)+/- 3.8kHz spacing R316 monitor socket SK402 +0/-0.2 c) 12.5kHz channel c)+/- 2.4kHz spacing.

  • Page 69: Transmit Modulation Alignment With Selcall

    4.5.9 TransmIt Modulation Alignment with Selcall Step Result Result Adjust Result Notes Measured by Measured at PERFORM ALIGNMENT PROCEDURE 4.5.7 (AND 4.5.8 IF CTCSS IS FITTED). SWITCH OFF A.F. SIG. GEN. Switch on power, ch. 6 UHF select channel 5. ch.

  • Page 74: Section 5 Installation Instructions

    SECTION 5 INSTALLATION INSTRUCTIONS NOTE: Refer also to"'VEHICLE CARE" page at front of handbook GENERAL INFORMATION 5.1.1 Operator Access The mobile radio unit(s) must be fitted in such a position that the operator has easy access to the controls and the microphone when wearing a seat belt. The controls must also be situated so that they are within the driver's normal field of vision.

  • Page 75: Specialised Vehicles

    In the case of a loudspeaker it is necessary for the loudspeaker grill to face the operator when mounted. The PRM80 series has been designed with safety in mind, e.g. non-reflective surface, no protrusions or sharp corners. Care must be taken when installing these, to ensure that any additional metalwork necessary to fix the units into the vehicle conforms to the same requirement.

  • Page 76: Main Unit Fitment

    MAIN UNIT FITMENT 5.2.1 Cradle Installation Refer to Figure 5.1. Fit the transceiver cradle into the required position in the vehicle using a minimum of four screws. The screws should be placed as far apart from each other as possible. The base of the cradle is provided with slotted holes for situations where lateral adjustment is required during the installation.

  • Page 77: Microphone Removal

    5.2.5 Microphone Removal Refer to Figure 5.3. To remove the microphone, first remove the microphone socket cover. WARNING: This procedure requires that great care and precision be exercised when removing the cover so as to avoid causing damage to the plastic items. A wide (10mm) flat blade screwdriver with a soft cloth fabric covering the blade is placed into the gap between the top of the cover and the front panel.

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