PHILIPS PRM80 SERIES VHF/UHF MOBILE RADIO TELEPHONE WARNING 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.
SECTION 1 INTRODUCTION 1.1 PRODUCT DESCRIPTION Section 1 Page 1 1 TABLE OF CONTENTS 1.1.1 1.1.2 Product Variants Product Family 1 2 1.2 1.3 1.4 MECHANICAL CONSTRUCTION SERVICE/ACCESSIBILITY SALES CODES 3 4 5 1.4.1 1.4.2 The 12-digit Sales Code The 20-digit Supplementary Technical Code 5 5 1.5 OPERATING INSTRUCTIONS 7 1.5.1 1.5.2 1.5.3 1.5.4 1.5.5 1.5.6 1.5.7 1.5.
SECTION 4 ALIGNMENT PROCEDURE 4.1 TEST EQUIPMENT 4.2 GENERAL INSTRUCTIONS 4.3 PRELIMINARY ADJUSTMENTS 4.4 TEST FREQUENCY TABLE Section 4 Page 1 1 1 1 2 4.4.1 Selcall Encode Test 3 4.5 THE PROCEDURE 4 4.5.1 4.5.2 4.5.3 4.5.4 4.5.5 4.5.6 4.5.7 4.5.
SECTION 1 1.1 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.
ii) 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). iv) Channel Spacing 12.5kHz, 20kHz, 25/30kHz. (Different printed circuit board assemblies required for each option). v) Frequency Stability: +/-5 ppm -10 to +60 Deg C (Better quality crystal).
vi) Large loudspeaker vii) Depot Data programmer. viii) 24 volt to 12 volt do to do converter. ix) Interference filter (12 volt do power). 1.2 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.
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.
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.
3 1.2 Provisi Chann el onal Spacin 7 2 3 4 6 B 7 6 9 4,5 7 10 11 15 6 12 14 8 9 13 Freq Freq. RF CTCS Seque Installa Speak Noise Control Version Mic. Band Stab Power S nt. tion er Blanke (MHz) (Watts) Signall Signalli Not Not Notr Not Not No kit. require require fittedfitted. fitted. d. Stand d. 5pp 1 to SPRM8 Selcall Swivel Stand LocalENC. Fitted. m 25 12.5 010. ENC bracke ardard-T0 (Std2.5p 1 to E0 PRM6 ENC/ Selcall t Comp R - 20 Stick. 25 68-88 p020. DEC. ENC( act. 80. 1opp T T0 ENC/ V - 25 DTMF.
1.5.1 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. 2. DO NOT operate the mobile radio in an explosive atmosphere. Obey the "Turn Off TWo Way Radios" signs where these are posted. 3. To avoid radio frequency injury, DO NOT TOUCH THE ANTENNA whilst the mobile radio is in use. 4.
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.
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.
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.
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.
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. 1.5.
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. It can be toggled between the quiet and listen modes. This button also cancels the called indicator. 1.5.7.
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. _2 CONTINUO Generated on Invalid TONE of PTT, or If microphone left ERROR of cradle 3 KEY BEEP TONE Generated when any button Is pressed. 4 DECODE 1 Generated for selcall decode ALERT response. TONE 5 URGENT ALERT TONE Generated for selcall urgent response. 6 GROUP ALERT TONE Generated for selcall group response.
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. channels or identities). A sample data sheet is shown below.
SECTION 2 TECHNICAL SPECIFICATIONS Unless otherwise stated, specifications apply for an ambient temperature of 25 Deg C and 13.8V supply. 2.1 GENERAL Operation Single- or two-frequency simplex. Modulation Frequency. Supply Voltage 10.8V to 16.2V dc, negative earthed to chassis. Frequency Bands VHF UHF E0 68 - 88 MHz B0 132 - 156 MHz A9 146 - 174 MHz Tm 400 - 440 MHz U0 440 - 470 MHz W 1 470 - 500 MHz W4 500 - 520 MHz Channel Spacing VHF UHF 12.5 kHz 20 kHz 25/30 kHz 12.
Switching Bandwidth Frequency band coverage without retuning UHF VHF VHF 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 VHF Off state Rx standby (no AF output) Tx (25W) UHF less than 10mA less than 10mA less than 350mA less than 350mA less than 5.5A less than 6.5A Type Approval Compliance The PMR80 is designed to comply with the following regulatory specification standards.
2.2 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 i). DOC method VHF Greater than 4.1mV pd (73dB wrt 0.31uV). UHF 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.
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 i) 4 watts into 4 ohms, less than 10% THD with 1kHz at 60% maximum deviation. ii) 16 watts into 4 ohms, optional. Audio Distortion Less than 5% THD for 300mW into 4 ohms, 1kHz at 60% deviation. Mute Response Time Mute set to open at 20dB SINAD.
Audio Frequency Response i) 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. ii) 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). Transmitter Rise Time Less than 40mSec from operation of the PTT to achieve 70% of output power. 2.4 SIGNALLING 2.4.1 2.4.1.1 (i) over PRM80 Selcall Specification ENCODER Tone Deviation.
(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 (i) Decoder Sinad Sensitivity. For 90% decode success rate sinad is measured at speaker output. 1. 2 (ii) Standard Selcall.
(iv) Valid Tone Period for Successful Decode. 80% deviation and full quieting. -40% to +70% (v) 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. 2.4.2 PRM80 CTCSS Specification 2.4.2.1 Encoder (i) Tone Deviation. 25kHz channel spacing 500 to 700Hz.
(ii) Software RTB. RTB phase shift: RTB duration: RTB amplitude variation (across CTCSS tone set). 2.4.2.3 180 degrees +/- 10 degrees, lagging. between 80mSec to 150mSec. CTCSS tone frequency dependent. See Table 2.1 0.5dB. Decoder (i) Tone-Set. as per Encoder. (ii) Bandwidth. +/- 3.0% max. (iii) Deviation Sensitivity. Better than 6% of system deviation (for decode with full RF quieting). (iv) Noise Immunity.
Table 2.1 CTCSS Tonesets Available In the PRM80 FREQ. (Hz) Tone Number R.T.B. Duration (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 114.8 Hz 118.8 Hz 123.0 Hz 127.3 Hz 131.8 Hz 136.5 Hz 141.3 Hz 146.2 Hz 151.4 Hz 156.7 Hz 162.2 Hz 167.9 Hz 173.8 Hz 179.9 Hz 186.2 Hz 192.8 Hz 203.5 Hz 210.7 Hz 218.1 Hz 225.7 Hz 233.6 Hz 241.8 Hz 250.
TABLE 2.2 Selcall Tonesets Available In the PRM80 TONE # 0 1 2 3 4 5 6 7 8 9 A B C D E F TONE # Manucturer s Type N International System No.- . Manufacturer's Type No.Intematonal System No. 0 1 2 3 4 5 6 7 8 9 A B C D E F TONE # 0 1 2 3 4 5 8 7 8 9 A B C D E F Manufacture's Type No. -+ Intemadonal I System No.
SECTION 3 3.1 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. i) Front Panel Board Containing the liquid crystal display, its driving circuit, push button switches and display backlighting.
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. 3.1.
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. A single phase locked loop principle is used with synthesis at the required final frequency.
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. A reverse tone burst feature is provided in two formats.
3.2 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 quarterwave transmission lines with one end short circuited to ground.
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. Further IF amplification is provided at 21.
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. This filter is a high pass design with a cut-off frequency of 300Hz.
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. 3.2.1.
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. The comparator will correct for this error and the result is a reduction in the output power.
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. The do voltage is fed back to the inverting input of a comparator circuit using OP AMP IC405.
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.
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. The output of TR423 emitter connects directly to the transmit VCO for modulation. Trim potentiometer R567 provides an adjustable level to modulate the reference oscillator.
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.
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; the total divider chain changing its division ratio by a factor of 64. To program a channel spacing of 25kHz, it would then be necessary to use a reference frequency Fr, of 25kHz/64 = 390Hz.
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. To improve the signal-to-noise ratio of the OP AMP output control voltage, it is necessary to maintain the voltage above 7 volts.
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.
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. In this way a very high immunity to microphony is assured. 3.2.4 Central Control Refer to figure 3.9. 3.2.4.
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. Diode D215 is incorporated to provide temperature compensation. The slightly higher than usual +5.
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.
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. TR225 is biased on, generating a logic low (0 volt) on the microprocessor interrupt input PIN 8.
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. The following is a description of the ports and their allocated function: P0.0 P0. 1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.
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. It is configured as an output when communicating with the display driver, CTCSS IC, serial latch, RF synthesizer and writing to the EEPROM. It is configured as an input when reading from the EEPROM. P 1.
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. This pin will have a series of pulses approx 20uSec wide appearing on it. P3.4 controls the alert tone generator. A logic low from this output will turn on the alert tone generator. Lines P3.5, P3.6 and P3.
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.
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 programming while waiting for the synthesizer loop to lock.
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. The output of IC205d is then coupled via C263, R323 and R390 to the final transmit audio summing amplifier IC210. 3.2.4.9 CTCSS AND REVERSE TONE BURST IC204 located on the control PCB, is the CTCSS encoder/decoder device.
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. The information is programmed serially with the enable input at PIN 28 of IC held high during the data burst. The information is latched within IC100.
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.
SECTION 4 ALIGNMENT PROCEDURE 4.1 TEST EQUIPMENT i) Rhode and Schwartz model SMFP or CMT. Alternative: Marconi transceiver test set model 2995. ii) Power supply 13.8 volt at 10 amp Kenwood PD35-20 or PS775. iii) CRO Philips PM3055 (greater than 20MHz BW). iv) DVM Fluke 77 or similar 4.2 GENERAL INSTRUCTIONS i) The alignment of the PRM80 is performed using the EEPROM customization memory programmed with the standard test and alignment information.
4.4 TEST FREQUENCY TABLE NOTE; The appropriate table of information should be programmed into the transceiver. Frequency Band (MHz) EO 68 to 88 BO 132 to 156 A9 146 to 174 Tm 400 to 440 U0 440 to 470 Channel Number Test Frequency (MHz) TX Rx OPTION DETAILS Transmit CTCSS Selcall 1 2 3 4 5 6 68.025 78.025 87.025 68.025 78.025 87.025 68.525 78.525 87.525 68.525 78.525 87.525 25 25 25 1 1 1 107.2Hz 107.2Hz 107.2Hz ENC test 1 2 3 4 5 6 132.025 140.025 155.025 132,025 140.025 155.025 132.
Frequency Band (MHz) W1 470 to 500 W4 500 to 520 Channel Number Test Frequency (MHz) OPTION DETAILS Tx Rx Transmit Power CTCSS ENC/DEC Selcall 1 2 3 4 5 6 470.025 485.025 499.025 470.025 485.025 499.025 470.525 485.525 499.525 470.525 485.525 499.525 25 25 25 1 1 1 107.2Hz 107.2Hz 107.2Hz ENC test tone 1 2 3 4 5 6 500.025 510.025 519.025 500.025 510.025 519.025 500.525 510.525 519.525 500.525 510.525 519.525 25 25 25 1 1 1 107.2Hz 107.2Hz 107.2Hz ENC test tone 4.4.
4.5 THE PROCEDURE 4.5.1 VCO Alignment 4.5.1.1 VHF RECEIVE VCO Step Result Result Adjust Result No Measured by Measured at Switch on power 1 Select ch. 3.. DVM, dc 2 TP402 L407 15.0 +10.2V volt, range DVM, dc 3 TP402 Select channel 1 3.OV to 5.OV volt. range 4 Disconnect DVM. Notes Highest freq. channel. Lowest freq. channel. 4.5.1.2 VHF TRANSMIT VCO Step Result Result Adjust Result No Measured by Measured at Switch on power. 1 Select ch. 3. 2 Activate PTT. 3 DVM, dc TP402 volt. range.
4.5.2 Transmitter Power Adjustment (Continued) Step Result Result Adjust No Measured by Measured at do supply 4 Ammeter input Result Notes <6.5A (UHF) <5.5A (VHF) Checks current consumption Ensures Tx indicator is operating 5 LC Display 6 Disable PTT select ch. 5 7 Activate PTT 8 Power Meter Mid freq. channel for low power. Antenna R578 socket SK402 1.0 -/+ 0.1 watt. Ensures Tx indicator is operating. 9 LC Display 10 11 4.5.
4.5.4 Step Result No Measured by UHF Receiver Front End Alignment Result Adjust Measured at Result Switch on power and select channel 1. 1 Antenna RF sig. gen. socket SK402 output.. 2 Notes Lowest freq. channel. 50uV pd level and freq. for channel 1. CRO, 5mV ac per div. PIN 2 of 3 10uSec per div. U401 10x probe. R554 4 Select ch. 3 5 RF sig. gen. output. Freq. of channel 3 CRO 5mV ac per div PIN 2 of 6 10uSec per div. U401 10x probe. R557 Modulate generator with 1 kHz at 60% of max. dev.
4.5.5 VHF Receiver Front End Alignment Step Result No Measured by Result Adjust Measured at Result Switch on power and select channel 3. 1 2 DVM, 3 dc voltage range. CRO, 5mV ac per div. 4 10uSec per div. 1 0x probe. Highest freq. channel. Antenna RF sig. gen. socket SK403 output. 50uV pd., and freq. of ch. 3. Modulate generator with 1 kHz at 60% of max. dev. TP403 R557 16.0 +/- 0.5V Sets tracking gain adjustment. PIN 2 of Tuning cores U401 FL401.
4.5.5 VHF Receiver Front End Alignment Step Result Result No Measured by Measured at 15 16 SINAD meter (Continued) Adjust Result RF sig. gen. output. 0.31 uV pd level. Greater than 12dB SINAD. Speaker output at SK202. Notes Verifies alignment 4.5.6 Mute Maximum Alignment Step Result Result Adjust No Measured by Measured at Switch on power select channel 2. 1 2 3 AF level meter. 4 Sinad meter 300mW in 4ohm. Speaker RF sig. gen.
4.5.7 Transmit Modulation Alignment (No CTCSS) Step Result No Measured by Result Adjust Measured at Switch on power select ch. 1 Microphone AF sig. gen. socket SK201 output PIN 8 2 CRO PIN 1 of Vac per div. 3 0.5mSec per div. SK400 1 x probe. CRO, 5mV ac per div. 4 TP401 0.5mSec per d' 1 x probe. 5 Deviation monitor. Deviation 6 monitor. 9 10 11 12 Deviation monitor. Notes Select ch.2 on VHF Select ch.3 on UHF 1 kHz at 400+/- 40mV rms Activate PTT Adjust 8316. Adjust R322. Peak, approx 5V p.p.
4.5.7 Transmit Modulation Alignment (No CTCSS)(Continued) Step Result Result Adjust No Measured by Measured at 13 Deviation monitor 14 Antenna R316 socket SK402 Result Notes a)+/- 4.8kHz +0/-0.2 b)+/- 3.8kHz +0/-0.2 c)+/- 2.4kHz +0/-0.1 a) 25/30kHz channel spacing b) 20kHz channel spacing c) 12.5kHz channel spacing. Slight re-adjustment may be necessary Disable PTT 4.5.
4.5.9 TransmIt Modulation Alignment with Selcall Step Result Result Adjust No Measured by Measured at Result Notes PERFORM ALIGNMENT PROCEDURE 4.5.7 1 (AND 4.5.8 IF CTCSS IS FITTED). SWITCH OFF A.F. SIG. GEN. 2 Switch on power, select channel 5. ch. 6 UHF ch. 5 VHF 3 LC Display Press SEND button. Checks display. 4 Deviation monitor Frequency 5 counter at monitor 6 Antenna R323 socket SK402 a)+/- 4kHz +/- 200Hz b)+/- 3kHz +/- 200Hz c)+/- 2kHz +/- 100Hz Antenna socket SK402 1358 +/- 4Hz..
SECTION 5 INSTALLATION INSTRUCTIONS NOTE: Refer also to"'VEHICLE CARE" page at front of handbook 5.1 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. 5.1.
5.1.4 Specialized Vehicles The installation on certain specialized vehicles, such as Petrol Tankers and Fire Appliances, may be subject to safety regulations which must be closely observed. Prior to commencing an installation on such a vehicle, be sure that any relevant safety regulations are fully understood. 5.1.5 Dash Mounted Equipment Conditions in Section S.1.1 must be complied with when positioning equipment. Fitting positions above the driver's or passenger's head must be avoided.
5.2 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. Open ended holes are provided on the cradle at the transceiver mounting point.
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.
