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Spectrum Test

1. Connect a spectrum analyzer to a sampled RF output of the radio.

2. Press the PTT switch. Observe the output spectrum on the spectrum analyzer.

3. All spurious and harmonics should be at least 60 dB below the carrier level.

4. Release the PTT switch.

RECEIVER PERFORMANCE TESTS

SINAD Sensitivity

1. Connect the FM signal generator of communication service monitor to the antenna jack.

2. Connect a SINAD meter across the speaker leads.

3. Turn the SQUELCH control fully counterclockwise for maximum noise.

4. Adjust the VOLUME control to approximately mid-range.

5. Set the FM signal generator or service monitor to the receive frequency. The modulation should be set for 3

kHz deviation of a 1 kHz tone.

6. Adjust the generator RF level so that the SINAD meter reads 12 dB. The signal generator RF level should

be .35 uV or less.

Noise Quieting Sensitivity

1. Connect a VOM to the speaker leads.

2. Turn the SQUELCH control fully counterclockwise for maximum noise.

3. With no RF signal generator or communication service monitor connected to the radio, adjust the

VOLUME control to obtain a noise reading of 1 volt RMS on the VOM.

4. Connect the RF signal generator or service monitor to the radio. Set the RF frequency to the receiver

frequency of radio and remove any modulation.

5. Adjust the signal generator RF level for a noise reading on the VOM of 0.1 volt RMS. This is the 20 dB

noise quieting point. the RF level should be 0.5 uV or less.

Squelch Sensitivity

1. Set the RF signal generator or service monitor to the receive frequency. Set the modulation to 3 kHz

deviation of a 1 kHz audio tone.

2. Reduce the signal generator RF output to zero.

3. Rotate the SQUELCH control clockwise to the point where the speaker noise just goes away.

4. Increase the signal generator or service monitor RF level until the speaker noise returns. This is the

threshold squelch setting. The generator output level should not exceed 0.20 uV.

5. Turn the SQUELCH control to maximum clockwise rotation.

6. Increase the generator output level until the squelch opens (busy LED is on). The output level should be

between 10 and 20 dB (3 to 10 times) above the threshold setting.

MONOGRAM SERIES LBI-38865

PERFORMANCE TEST

Page-27-

Nov. 94

Содержание MGM 450

Страница 1: ...ericssonz LBI 38865A Maintenance Manual Monogram Series UHF MOBILE RADIO MODEL MGM 450 ...

Страница 2: ...hout the express written permission of Ericsson Inc Copyright November 1994 Ericsson Inc NOTICE The software contained in this device is copyrighted by Ericsson Inc Unpublished rights are reserved under the copyright laws of the United States NOTE Repairs to this equipment should be made only by an authorized service technician or facility designated by the supplier Any repairs alterations or subs...

Страница 3: ...BOTTOM COVERS 15 FRONT PANEL 15 RF BOARD 15 DIGITAL BOARD 16 PROGRAMMING INSTRUCTION 17 TEST EQUIPMENT SETUP 18 ALIGNMENT PROCEDURE 19 22 SUGGESTED TEST EQUIPMENT 19 PROGRAMMING FOR ALIGNMENT 19 PLL ALIGNMENT 20 TRANSMITTER ALIGNMENT 20 RECEIVER ALIGNMENT 22 RF BOARD ALIGNMENT AND TEST POINTS 24 DIGITAL BOARD ALIGNMENT AND TEST POINTS 25 PERFORMANCE TEST 26 27 TRANSMITTER PERFORMANCE TEST 26 RECEI...

Страница 4: ...VIEW 406136 F ISSUE H RF BOARD 32 2 TOP VIEW 406137 E ISSUE H DIGITAL BOARD 32 3 BOTTOM VIEW 406137 E ISSUE H DIGITAL BOARD 32 4 MISC PRINTED CIRCUIT BOARDS 32 5 MISC PRINTED CIRCUIT BOARDS 32 6 EXPLODED VIEW AND PARTS LIST 33 SCHEMATICS 34 MONOGRAM SERIES LBI 38865 TABLE OF CONTENTS Page iv Nov 94 ...

Страница 5: ...rain Standby 0 15 Amp Receive 0 5 Amp Transmit 8 Amp Temperature Range 30 to 60 C Dimensions 2 x 6 x 8 25 inches 51 x 152 x 210 mm Weight 4 lbs 3 oz 1 9kg With Mic FCC Compliance Parts 15 22 74 90 95 FCC ID Designation 400 440 MHz F3JSM445A 450 470 MHz F3JSM445C 470 512 MHz F3JSM445E DOC Canada Type Approval 400 440 MHz N A 450 470 MHz 287194100I 470 512 MHz N A MONOGRAM SERIES LBI 38865 SPECIFICA...

Страница 6: ...70 dB Audio Power Output 5 W 10 Dist into 40 W Load Frequency Stability 0 0005 Operational Bandwidth 10 mHz 3dB degradation at band limits Frequency Spread Band Width Factory Programmed Freq Spreads 400 440 MHz 10 MHz 405 415 MHz 3 dB Degradation at limits 450 470 MHz 10 MHz 460 470 MHz 3 dB Degradation at limits 470 512 MHz 10 Mhz 500 510 MHz 3 dB Degradation at limits UHF PROGRAMMING CHART RECEI...

Страница 7: ...quency Stability 0 0005 Operational Bandwidth 20 mHz 3dB degradation at band limits Frequency Spread Band Width Factory Programmed Freq Spreads 400 440 MHz 20 MHz 405 420 MHz 3 dB Degradation at limits 450 470 MHz 20 MHz 450 470 MHz 3 dB Degradation at limits 470 512 MHz 20 Mhz 490 510 MHz 3 dB Degradation at limits UHF PROGRAMMING CHART TRANSMIT MONOGRAM SERIES LBI 38865 SPECIFICATIONS Page 3 Nov...

Страница 8: ...IES CONTROL STATION OPTIONS NOTSHOWN Antenna MGAN1A Relay Kit MGSU1C Noise Suppression Kit MGPD1A Power Supply MGPS5V External Speaker MGZM7C Desk Microphone MGMC5H MONOGRAM SERIES LBI 38865 SPECIFICATIONS Page 4 Nov 94 ...

Страница 9: ...g material carefully for the following items 1 Transceiver Unit 2 Microphone 3 DC power cord 4 Mobile Mounting Bracket 5 Assembly Hardware 6 Operating Guide Styrofoam not used Inner Packing is now cardboard tray box MONOGRAM SERIES LBI 38865 UNPACKING Page 5 Nov 94 ...

Страница 10: ...croprocessor Control Synthesized RF Channel selection frequency control Vacuum Fluorescent Channel Selection Display Channel Guard CTCSS Encode Decode Digital channel Guard DCG Encode Decode Priority Scan 5 PPM frequency stability Field Programmable with PC Variable Squelch Internal 5 watt Speaker with volume control Side Mounted Microphone Connector Rear Mounted Antenna Connector SO 239 Rear powe...

Страница 11: ... SCAN Push Button P This button turns the PRIORITY SCAN function ON indicated by a red backlight and OFF It also provides access to the programming mode when the radio is turned on 7 Channel Change buttons CH The channel change buttons allow the operator to scroll either up or down through the programmed channels 8 Call Light Indicator CALL This green Light Emitting Diode LED indicator illuminates...

Страница 12: ...2 Auxiliary Speaker Connector This 3 5mm diameter jack is provided for an auxiliary speaker Option MGSU1C Relay Kit is required 3 Antenna Connector An SO 239 type connector The output load must be 50 ohms 4 DC 13 8V Connector Polarized plug for 13 8 VDC power input FOR NEGATIVE GROUND SYSTEMS ONLY FIGURE 3 Back Panel Controls MONOGRAM SERIES LBI 38865 DESCRIPTION OF CONTROLS Page 8 Nov 94 ...

Страница 13: ...sary to illuminate it s backlight Adjust the volume control to a comfortable listening level 3 Rotate the SQUELCH control clockwise until the squelch noise rushing sound is no longer present 4 Depress the MONITOR button 2 to extinguish the blacklight NOTE If the radio is equipped with coded squelch options depress the MONITOR button 2 to enable the option the CALL indicator will no longer be illum...

Страница 14: ...at Channel Guard is programmed and disabled Table 1 Channel Guard tone Frequencies Standard Tone Frequencies in Hertz 67 0 71 9 74 4 77 0 79 7 82 5 85 4 88 5 91 5 94 8 97 4 100 0 103 5 107 2 110 9 114 8 118 8 123 0 127 3 131 8 136 5 141 3 146 2 151 4 156 7 162 2 167 9 173 8 179 9 186 2 192 8 203 5 210 7 218 1 225 7 233 6 241 8 250 3 Table 2 Primary DCS Codes DIGITAL SQUELCH CODES 023 114 174 266 4...

Страница 15: ...fore being supplied to the drain of Q2 The difference frequency signal at 21 4 MHz exits the mixer at the source of Q2 and is tuned for 21 4 MHz by T8 which drives the first IF filter XF1 and XF2 XF1 and XF2 form a 4 pole monolithic crystal filter pair which in part determines the selectivity of the radio The output of the crystal filter is routed to the first IF amplifier formed around Q3 RF tran...

Страница 16: ... automatic power control The carrier signal passes through the automatic power control directional coupler the RF output lowpass filter and then is routed to the antenna connector Automatic Power Control The automatic power control directional coupler samples a portion of the forward RF power output to determine the RF level Diode D15 rectifies this RF sample and produces a DC voltage which is pro...

Страница 17: ...tate of IC118 pin 6 This produces a lower frequency which can be further divided by IC108 By strategic timing when to divide by 128 or 129 the overall division will be that necessary to put the VCO on the correct frequency Loop Filter Resistors R317 through R322 and capacitors C291 C294 and C295 form the loop filter The purpose of the loop filter is to filter out the 6 25 kHz reference frequency p...

Страница 18: ...ation limits Over voltage is indicated when the battery loses water rapidly Usage of 1 or 2 ounces of water per cell per week is acceptable for batteries in continuous operation A weak battery will often cause excessive noise or faulty operation MECHANICALINSPECTION Since mobile units are subject to constant shock and vibration check for loose plugs nuts screws and other parts to make sure that no...

Страница 19: ...digital board A ribbon cable from the display board to the digital board must be unplugged to remove front panel RFBOARD 1 Remove the 13 M3 x 24 machines screws securing the RF shield to the chassis 2 Remove the M3 x 8 machine screw that secures the DC cord bracket to the chassis Slide the bracket and cord out of the chassis 3 Remove the 6 M3 x 6 machine screws 3 on top and 3 on bottom that secure...

Страница 20: ...ket to the chassis Slide the bracket and cord out of the chassis 6 Remove the RF shield by pushing the front panel forward so the shield will clear and then sliding the DC cord bracket and connector through the rectangular hole in the shield 7 Unplug the VCO cable from the jack 8 Remove the remaining 10 screws securing the digital board IC5 IC6 and IC104 to the chassis 9 The digital board can now ...

Страница 21: ... the radio To use this cable remove the top cover of the radio as described in the DISASSEMBLY section Plug the six pin connector into the socket inside the radio PL1 which is located near the EEPROM IC107 Plug the base of the Y into the computer that will program the radio See the diagram in TQ 3375 Software Manual In order to program the radio with the programming cable it is necessary to put th...

Страница 22: ...TEST EQUIPMENT SETUP OPTIONAL TEST EQ MONOGRAM SERIES LBI 38865 TEST EQUIPMENT SETUP Page 18 Nov 94 ...

Страница 23: ...RAMMINGFORALIGNMENT For the alignment procedures the EEPROM should be programmed as follows 1 An EEPROM should be programmed with 3 transmit and 3 receive frequencies 2 The lowest and highest frequencies should enclose the user s frequencies and be 10 MHz apart The lowest and highest frequencies must be within the appropriate frequency band 3 In addition to programming frequencies CTCSS and DCS co...

Страница 24: ...ead less than 7 5 volts 7 Release the PTT switch CHANNEL TP1 VOLTAGE TRANSMIT RECEIVE Lowest Frequency 1 5 VDC 2 0 VDC Highest Frequency 7 5 VDC 7 0 VDC TRANSMITTERALIGNMENT 1 Connect a 50 ohm RF dummy load or a power attenuator 50 watt minimum rating through a watt meter 50 watt scale to the antenna receptacle 2 Turn RV2 Automatic power adjustment fully clockwise 3 Connect variable DC power suppl...

Страница 25: ...o prevent damage to the deviation meter 3 Press the PTT switch 4 Observe the waveform on the oscilloscope and compare with that shown in Figure 6 5 Adjust RV5 and TC12 to achieve the proper wave form Release the PTT switch 6 Replace the deviation meter with a frequency counter 7 Set the CHANNEL selector to the highest transmit channel Ensure that this channel has no DCS or CTCSS tones pre programm...

Страница 26: ... for the 4 2 kHz deviation if no CTCSS tones are present and 4 9 kHz deviation if CTCSS tones are present RECEIVERALIGNMENT 1 Connect an RF signal generator or communications service monitor to the antenna receptacle 2 Connect a SINAD meter and an audio distortion analyzer across the speaker terminals If an audio distortion analyzer is not available connect an oscilloscope across the speaker termi...

Страница 27: ...nimum 3 Adjust the SQUELCH control to the threshold point the point where the speaker audio disappears 4 Increase the RF signal generator output level until speaker audio output reappears Note the generator level 5 Turn the SQUELCH control fully clockwise 6 Increase the RF signal generator level by 16 dB NOTE This squelch adjustment procedure is very important for the correct operation of the micr...

Страница 28: ...RF BOARD ALIGNMENT AND TEST POINTS MONOGRAM SERIES LBI 38865 RF BOARD ALIGNMENT AND TEST POINTS Page 24 Nov 94 ...

Страница 29: ...DIGITAL BOARD ALIGNMENT AND TEST POINTS MONOGRAM SERIES LBI 38865 DIGITAL BOARD ALIGNMENT AND TEST POINTS Page 25 Nov 94 ...

Страница 30: ... audio generator level to produce 1 kHz deviation 5 Set the audio generator frequency to 2 kHz The transmitter deviation should be approximately 2 kHz 6 As the audio generator frequency is varied from 300Hz to 10 kHz the deviation should increase until it reaches a maximum at an audio frequency of 2 5 kHz to 2 9 kHz At higher frequencies the deviation should decrease the deviation at an audio freq...

Страница 31: ...unication service monitor connected to the radio adjust the VOLUME control to obtain a noise reading of 1 volt RMS on the VOM 4 Connect the RF signal generator or service monitor to the radio Set the RF frequency to the receiver frequency of radio and remove any modulation 5 Adjust the signal generator RF level for a noise reading on the VOM of 0 1 volt RMS This is the 20 dB noise quieting point t...

Страница 32: ...o distortion analyzer may include this function to the speaker leads 4 With a 3 kHz deviation of a 1 kHz tone modulation applied to the signal generator rotate the VOLUME control clockwise until the audio distortion is 10 or until the VOLUME controls reaches stop whichever comes first 5 The audio voltmeter should read 4 0 volts or greater MONOGRAM SERIES LBI 38865 PERFORMANCE TEST Page 28 Nov 94 ...

Страница 33: ...rface mount component with the soldering iron If a hot air system is used direct the heat to the terminals of the component Use extreme care with the soldering equipment to prevent damage to the printed circuit board PCB and the surrounding components 3 When the solder on all terminals is liquefied gently remove the component Excessive force may cause the PCB pads to separate from the board if all...

Страница 34: ...stem is the best method of replacing surface mount IC s can easily be removed and installed using the hot air system See the manufacturers instructions for complete details on tip selection and other operating instructions unique to your system If a hot air system is not available the service technician may wish to clip the pins near the body of the defective IC and remove it the pins can then be ...

Страница 35: ...those items indicated by shading will be stocked by After Market Services All other items are for reference only When ordering parts for your Monogram Series radio precede all part numbers with the prefix R29 NOTE Page 31 Nov 94 ...

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Страница 53: ...PRINTED CIRCUIT BOARD LAYOUT Page 32 Nov 94 ...

Страница 54: ...TOP VIEW 406136 E RF BOARD MONOGRAM SERIES LBI 38865 TOP VIEW 406136 E RF BOARD Page 32 1 Nov 94 ...

Страница 55: ...BOTTOM VIEW 406136 E RF BOARD MONOGRAM SERIES LBI 38865 BOTTOM VIEW 406136 E RF BOARD Page 32 2 Nov 94 ...

Страница 56: ...TOP VIEW 406137 E DIGITAL BOARD MONOGRAM SERIES LBI 38865 TOP VIEW 406137 E DIGITAL BOARD Page 32 3 Nov 94 ...

Страница 57: ...BOTTOM VIEW 406137 E DIGITAL BOARD MONOGRAM SERIES LBI 38865 BOTTOM VIEW 406137 E DIGITAL BOARD Page 32 4 Nov 94 ...

Страница 58: ...MISC PRINTED CIRCUIT BOARDS DISPLAY BOARD BOTTOM VIEW DISPLAY BOARD TOP VIEW VOLUME BOARD BOTTOM VIEW VOLUME BOARD TOP VIEW MONOGRAM SERIES LBI 38865 MISC PRINTED CIRCUIT BOARDS Page 32 5 Nov 94 ...

Страница 59: ...ED CIRCUIT BOARDS 406 968 C RF PCB TOP 406 968 C RF PCB BOTTOM 406 973 A TOP 406 973 A BOTTOM 406 969 F DIG PCB TOP 406 969 F DIG PCB BOTTOM MONOGRAM SERIES LBI 38865 MISC PRINTED CIRCUIT BOARDS Page 32 6 Nov 94 ...

Страница 60: ...VOLTAGE CHARTS MONOGRAM SERIES LBI 38865 VOLTAGE CHARTS Page 32 7 Nov 94 ...

Страница 61: ...VOLTAGE CHARTS MONOGRAM SERIES LBI 38865 VOLTAGE CHARTS Page 32 8 Nov 94 ...

Страница 62: ...VOLTAGE CHARTS MONOGRAM SERIES LBI 38865 VOLTAGE CHARTS Page 32 9 Nov 94 ...

Страница 63: ...MONOGRAM SERIES LBI 38865 VOLTAGE CHARTS Page 32 10 Nov 94 ...

Страница 64: ... LIST Only those items indicated by shading will be stocked by After Market Services All other items are for reference only When ordering parts for your Monogram Series radio precede all part numbers with the prefix R29 NOTE Page 33 Nov 94 ...

Страница 65: ...MONOGRAM SERIES LBI 38865 Page 33 1 Nov 94 ...

Страница 66: ...MONOGRAM SERIES LBI 38865 Page 33 2 Nov 94 ...

Страница 67: ...MONOGRAM SERIES LBI 38865 Page 33 3 Nov 94 ...

Страница 68: ...SCHEMATICS Ericsson Inc Private Radio Systems Mountain View Road Lynchburg Virginia 24502 1 800 528 7711 Outside USA 804 528 7711 Printed in U S A Page 34 Nov 94 ...

Страница 69: ...RF BOARD R29 406136 E LBI 38865 34 1 ...

Страница 70: ...DIGITAL BOARD R29 406137 E LBI 38865 34 2 ...

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