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DB Electronics PM 300 User Manual

Fm broadcasting transmitter
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DB
ELETTRONICA TELECOMUNICAZIONI S.p.A.
FM Broadcasting Transmitter
User's Manual
Release 2.0
- DB ELETTRONICA TELECOMUNICAZIONI S.p.A. -
- Via Lisbona, 38 - 35127 Z.I. SUD PADOVA ITALY -- Ph. (049) 870-0588 - Fax. (049) 870-0747 -
- http://www.dbbroadcast.com -
PM 300 - FM Broadcasting Transmitter - U
'
M
1 /108
SER
S
ANUAL

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  • Page 1 - DB ELETTRONICA TELECOMUNICAZIONI S.p.A. - - Via Lisbona, 38 - 35127 Z.I. SUD PADOVA ITALY -- Ph. (049) 870-0588 - Fax. (049) 870-0747 - - http://www.dbbroadcast.com - PM 300 - FM Broadcasting Transmitter - U ’ 1 /108 ANUAL...

  • Page 2: Safety Notices

    This installation should be done by a qualified person and should comply with to all local applicable laws. NOTICE: ALL THE SPECIFICATIONS AND TECHNICAL INFORMATION IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. 2 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 3: Table Of Contents

    13.2 STEREO ENCODER PARTS LIST....................98 CONTRAVES BOARD (OPTION) ....................101 14.1 GENERAL DESCRIPTION ......................101 14.2 CONTRAVES BOARDS PARTS LIST..................103 TROUBLESHOOTING........................104 APPENDIX A.............................106 16.1 XLR AUDIO CONNECTORS PINOUTS ..................106 APPENDIX B.............................107 17.1 MOSFET REPLACEMENT......................107 PM 300 - FM Broadcasting Transmitter - U ’ 3 /108 ANUAL...
  • Page 4 . 13.2 - L/R PEAK DETECTOR STAGE ELECTRICAL SCHEMATIC ..........88 . 13.3 - INPUT STAGE ELECTRICAL SCHEMATIC ................90 . 13.4 - RIGHT FILTER STAGE ELECTRICAL SCHEMATIC ..............91 . 13.5 - LEFT FILTER STAGE ELECTRICAL SCHEMATIC..............92 4 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 5 . 13.10 - STEREO ENCODER COMPONENT LAYOUT (DB 9506-001)..........97 . 14.1 - CONTRAVES BOARD ELECTRICAL DIAGRAM ..............102 . 14.2 - CONTRAVES BOARD COMPONENT LAYOUT (DB 9308-020)...........103 . 17.1 - MOSFET REPLACEMENT ......................108 PM 300 - FM Broadcasting Transmitter - U ’ 5 /108 ANUAL...

  • Page 6: Pm300 Fm Transmitter

    The /FSK option makes the PM300 transmitter fully compatible with the FCC automatic identification system. The /VDC option provides battery operation. 6 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 7 An output LP filter ensures a pure RF spectrum, compatible with the most stringent international requirements. As well, a high efficiency switching mode power supply reduces the power consumption, and ensures reliable operation. PM 300 - FM Broadcasting Transmitter - U ’ 7 /108...
  • Page 8 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 1.1 - FRONT VIEW 8 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 9 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 1.2 - REAR VIEW PM 300 - FM Broadcasting Transmitter - U ’ 9 /108 ANUAL...
  • Page 10 4) AMP300 RF Amplifier Board 10) Switching power supply module (PBIT2180) 5) AMP30 Driver Board 11) Meter and microprocessor boards 6) Ventilation System 12) Protection boards (N°1, N°2) 10 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 11: Technical Specifications

    S/N ratio (± 75 kHz peak dev. with 1 kHz input, 50ms deemphasized)........³70 dB THD+N (± 75 kHz peak dev. with 1 kHz input, unweighted).............£0.1% Stereo separation ........................³60 dB PM 300 - FM Broadcasting Transmitter - U ’ 11 /108...

  • Page 12: Power Requirements

    Dimension (W x H x D) mm..................483 x 132 x 513 OPTIONS External frequency setting ........................ /C Stereo coder ............................/S Audio processor ........................../P Remote control ........................../R Battery operation ......................... /VDC 12 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 13: Installation

    WARNING: The transmitter can work properly within ± 10 % of the nominal main supply voltage and is designed to support main supply spikes, although it is preferable to use the main voltage stabilizers to reduce the risk of damage. PM 300 - FM Broadcasting Transmitter - U ’ 13 /108...

  • Page 14: Frequency Setting

    To find the correct dip-switches configuration corresponding to the needed FM channel, please refer to the following example with 98 MHz frequency. 14 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 15 - Select 0.72 - 0.64 = 0.08 MHz, there is a weight equal to 0.08 MHz, so turn OFF the corresponding switch to complete the setting. The final configuration is: 4 - Adjust the desired output power using the front panel potentiometer. PM 300 - FM Broadcasting Transmitter - U ’ 15 /108 ANUAL...

  • Page 16: Adjustments And Measures

    The mono signal is obtained by a semi-sum of the left and the right signals. If the internal stereo generator board is not present, the switch mentioned above and the corresponding LED are not used. 16 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 17 On the front panel there is a leds meter bar which allows the measurement of the most important parameters of the transmitter. The push-button labeled “MEASURE SELECT” allows to select the measurement required. Each measure selected light on one of the leds below the bar. PM 300 - FM Broadcasting Transmitter - U ’ 17 /108 ANUAL...

  • Page 18: Power Supply Section

    ELETTRONICA TELECOMUNICAZIONI S.p.A. 6. POWER SUPPLY SECTION 6.1 GENERAL DESCRIPTION PM 300 transmitter power supply is composed of the following elements: n°1 switching power supply module (PBIT 2180) to power supply the mosfet amplifier and the equipment power supply board.
  • Page 19 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.1 - SWITCHING POWER SUPPLY MODULE ELECTRICAL SCHEMATIC “A” PM 300 - FM Broadcasting Transmitter - U ’ 19 /108 ANUAL...
  • Page 20 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.2 - SWITCHING POWER SUPPLY MODULE ELECTRICAL SCHEMATIC “B” 20 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 21 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.3 - SWITCHING POWER SUPPLY MODULE COMPONENT LAYOUT PM 300 - FM Broadcasting Transmitter - U ’ 21 /108 ANUAL...

  • Page 22: Switching Power Supply Module Part List

    ELETTRONICA TELECOMUNICAZIONI S.p.A. 6.2 SWITCHING POWER SUPPLY MODULE PART LIST 22 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 23 ELETTRONICA TELECOMUNICAZIONI S.p.A. PM 300 - FM Broadcasting Transmitter - U ’ 23 /108 ANUAL...
  • Page 24 ELETTRONICA TELECOMUNICAZIONI S.p.A. 24 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 25 ELETTRONICA TELECOMUNICAZIONI S.p.A. PM 300 - FM Broadcasting Transmitter - U ’ 25 /108 ANUAL...
  • Page 26 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.4 – EQUIP. PWR SUPP. BOARD GENERAL ELECTRICAL SCHEMATIC 26 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 27 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.5 - EQUIP. PWR SUPP. BOARD +24 V STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 27 /108 ANUAL...
  • Page 28 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.6 - EQUIP. PWR SUPP. BOARD-12V STAGE ELECTRICAL SCHEMATIC 28 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 29 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.7 - EQUIP. PWR SUPP. BOARD +12V STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 29 /108 ANUAL...
  • Page 30 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.8 - EQUIP. PWR SUPP. BOARD COMPONENT LAYOUT (DB 0206_090) 30 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 31: Equip. Pwr Supp. Board Parts List (Db 0206_090)

    47Ω 1/8W R3010 10Ω 1/8W R3010 37K4Ω 1% R4010 9K09Ω 1% R4010 4K7Ω 1/4W R4010 0.47Ω 2W R7020 100Ω 1/4W R4010 270Ω 1/4W R4010 10Ω 1/2W R5015 1K2Ω 1/4W R4010 PM 300 - FM Broadcasting Transmitter - U ’ 31 /108 ANUAL...
  • Page 32 ELETTRONICA TELECOMUNICAZIONI S.p.A. ITEM QUANTITY REFERENCE PART ____________________________________________________________________________________________ 15KΩ 1/4W R4010 47V D10 V3015 150522 TA TA1 L4971 TRAD IC3008 UA78S40 TRAD IC3010 DB 0201_070 PRINTED BOARD 32 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 33 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.9 - DB 0201_070 PRINTED BOARD ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 33 /108 ANUAL...
  • Page 34 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.10 - DB 0201_070 PRINTED BOARD COMPONENT LAYOUT 34 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 35: Db 0201_070 Printed Board Parts List

    120KΩ SMD1% 0805 R42,R34 4K7Ω SMD 1206 R36,R37,R41 330Ω SMD 1206 47KΩ SMD 1206 R44,R45 100Ω SMD 1206 LM324 SMD SO14 UC3842 SMD SO8 TL431 SOT23/TO92 L6384 SMD SO8 PM 300 - FM Broadcasting Transmitter - U ’ 35 /108 ANUAL...

  • Page 36: Modulation Stage (Sintel 96)

    (CCIR, FCC). Furthermore, an automatic locking circuit enables the output modulated signal of SINTEL ’96 only when the internal PLL is locked properly, in order to avoid unwanted emissions. 36 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 37 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.1 - “SINTEL 96” MODULATION BOARD GENERAL ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 37 /108 ANUAL...
  • Page 38 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.2 - PLL STAGE ELECTRICAL SCHEMATIC 38 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 39 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.3 - VCO STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 39 /108 ANUAL...
  • Page 40 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.4 - LF 1 STAGE ELECTRICAL SCHEMATIC 40 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 41 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.5 - LF 2 STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 41 /108 ANUAL...
  • Page 42 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.6 - FILTER STAGE ELECTRICAL SCHEMATIC 42 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 43 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.7 - “SINTEL 96” MODULATION COMPONENT LAYOUT (DB 9604-010) PM 300 - FM Broadcasting Transmitter - U ’ 43 /108 ANUAL...

  • Page 44: Sintel 96" Modulator Parts List

    100n CP1 C106 100n C107 68p CER C113 1p CER C125 C127 C128 10n multistrato D3,D12,D13,D15,D16,D17, 1N4148 D4,D6,D9,D10 5V1 ZENER D8,D7 BB809 JUMPER JUMPER X2 JP8,JP7 JUMPER CON20 44 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 45 4K7 TRIM MONOGIRO PICC. R109,R68 560R RES 1/8W 10K TRIMMER MULTIGIRI 20K trim 560R 1% 1/4W 301k RES_1/4W_1% 3k57 RES_1/4W_1% 536R RES_1/4W_1% R85,R91,R97,R115,R116,R117 3k01 RES_1/4W_1% 3k3 RES_1/8W R88,R94 2k trim multi PM 300 - FM Broadcasting Transmitter - U ’ 45 /108 ANUAL...
  • Page 46 R126 220R RES 1/8W R128 100R RES 1/8W R129 330R RES 1/8W SW2,SW1 DIP SW 8 TP1,TP4,TP5,TP6,TP7,TP8, TP10 MC145152 U2,U19 TL082 78L05 MB501L 78L08 U10,U16,U17,U18 TL084 74HC14 2.56MHz 46 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 47: Amp30 Driver Stage

    .An external panel trimmer and the P2 trimmer in the AMP30 board allows to adjust the output power. The AMP30 board is equipped with an initial 5-6 seconds delay to avoid accidental out of band emissions in the initial PLL locking period. PM 300 - FM Broadcasting Transmitter - U ’ 47 /108 ANUAL...
  • Page 48 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 8.1 - AMP30 PRE AMPLIFIER ELECTRICAL SCHEMATIC 48 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 49 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 8.2 - AMP30 PRE AMPLIFIER COMPONENT LAYOUT (DB 0110_010A) PM 300 - FM Broadcasting Transmitter - U ’ 49 /108 ANUAL...

  • Page 50: Amp30 Pre Amplifier Parts List

    300Ω 1206 18Ω 1206 150Ω 1206 10Ω 1206 R20,R21,R24 10KΩ 1206 220KΩ 1206 100KΩ 1206 R43A,R43 220Ω 1206 2K7Ω 1206 P=20mm f=5mm 220Ω LM7815 TRAD TO220 NE555 SO08 50 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 51: Rf Amplifier Stage

    - operation in the 87.5 - 108 MHz frequency range - 45 - 50 Vds Voltage between drain and source - 80% efficiency (typical) - 300 W Output Power with 22 dB gain (typical) PM 300 - FM Broadcasting Transmitter - U ’ 51 /108 ANUAL...
  • Page 52 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 9.1 - AMP300 AMPLIFIER ELECTRICAL SCHEMATIC 52 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 53 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 9.2 - AMP300 AMPLIFIER COMPONENT LAYOUT (DB 9812_001) PM 300 - FM Broadcasting Transmitter - U ’ 53 /108 ANUAL...

  • Page 54: Amp300 Amplifier Parts List

    56pF CER C8,C3 100nF 200V 10nF 200V C5,C6,C7 1nF HQ300V 100uF 63V 5,6pF HQ 6 TURNS 17cm 0.8RS FERR2TUBE BLF278 150 kR 1206 R6,R7,R8,R9 22R4W TP1,TP2 CPFXCS 2TUBEOTTx2cm+TEFLONRSx20cm 54 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 55: Low Pass Filter And Directional Coupler

    ELETTRONICA TELECOMUNICAZIONI S.p.A. 9.3 LOW PASS FILTER AND DIRECTIONAL COUPLER Fig. 9.3 - L. P. FILTER AND DIR. COUP. ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 55 /108 ANUAL...

  • Page 56: Filter And Dir. Coup. Parts List

    2 TURNS WITH COPPER WIRE 1.5mm L3,L8 5 TURNS WITH COPPER WIRE 1.5mm L4,L7,L9 3 TURNS WITH COPPER WIRE 1.5mm L5,L10 4 TURNS WITH COPPER WIRE 1.5mm R2,R3 100R R4,R5 56 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 57: Protection Stage

    DB 9702-004 and DB 9703-011 boards are connected together and located just behind the front panel. They realize the intelligent protection, control and monitoring of PM 300 transmitter. On the J1 input/output connector (see Fig. 10.6) of the DB 9702-004 there are: 1) “FWD”...
  • Page 58 ). When the protection is active the front Fig. 10.6 panel “OVERHEAT” led lights on. WARNING: Any modification or variation must be made only with DB Elettronica authorization, otherwise voiding the warranty. 58 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 59 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.1 - PROTECTION /CONTROL STAGE N°1 GENERAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 59 /108 ANUAL...
  • Page 60 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.2 UNBALANCING PROTECTION STAGE 60 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 61 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.3 FWD PROTECTION STAGE PM 300 - FM Broadcasting Transmitter - U ’ 61 /108 ANUAL...
  • Page 62 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.4 - TEMPERATURE PROTECTION STAGE 62 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 63 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.5 - POWER LIMITING STAGE PM 300 - FM Broadcasting Transmitter - U ’ 63 /108 ANUAL...
  • Page 64 ELETTRONICA TELECOMUNICAZIONI S.p.A. 64 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 65 ELETTRONICA TELECOMUNICAZIONI S.p.A. PM 300 - FM Broadcasting Transmitter - U ’ 65 /108 ANUAL...
  • Page 66 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.6 PROTECTION /CONTROL STAGE N°1 COMPONENT LAYOUT (DB 9702_004) 66 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 67: Protection /Control Stage N°1 Parts List

    RES 1/4W RES 1/4W 1% R118,R159 RES 1/4W R120 8K66 RES 1/4W 1% R122 RES 1/8W R123 RES 1/8W R125 RES 1/8W R126 RES 1/8W U1,U2,U3 TL084 79L05 TL082 PM 300 - FM Broadcasting Transmitter - U ’ 67 /108 ANUAL...
  • Page 68 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.7 - PROTECTION /CONTROL STAGE N°2 GENERAL SCHEMATIC 68 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 69 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.8 PROTECTION STATUS STAGE PM 300 - FM Broadcasting Transmitter - U ’ 69 /108 ANUAL...
  • Page 70 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.9 POWER SUPPLY STAGE 70 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 71 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.10 MEASURES ADJ. STAGE PM 300 - FM Broadcasting Transmitter - U ’ 71 /108 ANUAL...
  • Page 72 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.11 - LED INDICATIONS STAGE 72 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 73 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.12 PROTECTION /CONTROL STAGE N°2 COMPONENT LAYOUT (DB 9703_011) PM 300 - FM Broadcasting Transmitter - U ’ 73 /108 ANUAL...

  • Page 74: Protection /Control Stage N°2 Parts List

    RES 1/8W R110,R112,R113,R131 RES 1/8W R114,R115,R134 RES 1/4W R139,R143,R146,R149 RES 1/8W R160 RES 1/4W 1% R161 8K66 RES 1/4W 1% R162,R163,R164,R165 RES 1/4W U11,U4 TL084 U7,U12 UA78S40 U8,U13 LT1054 74 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 75: Meter Stage

    11.1 GENERAL DESCRIPTION The meter stage is built using two boards: The ST62T25 microprocessor board DB 9903_040 The display board DB 9903_050 is composed of forty LED bargraph display. PM 300 - FM Broadcasting Transmitter - U ’ 75 /108 ANUAL...
  • Page 76 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 11.1 - MICROPROCESSOR STAGE ELECTRICAL SCHEMATIC (DB 9903_040) 76 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 77 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 11.2 - MICROPROCESSOR BOARD COMPONENT LAYOUT (DB 9903_040) PM 300 - FM Broadcasting Transmitter - U ’ 77 /108 ANUAL...

  • Page 78: Microprocessor Board Partlist

    1uF 50V ele. DL7,DL8,DL9 LED 3mm. D1,D2,D3 1N4148 JP1,JP2 STRIP2M JP10,JP11 STRIP7M JP21,JP20 STRIP5M J1,J2,J3 CNM20V CNM14V AMP4 CNM10V R9,R10,R12,R13,R16,R17,R18 R11,R14,R19,R20,R21,R22 P2,P3,P4,P5 Q2,Q1 BC547 680R S1,S2 C&K TL082 74HC32 78 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 79 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 11.3 - DISPLAY STAGE ELECTRICAL SCHEMATIC (DB 9903_050) PM 300 - FM Broadcasting Transmitter - U ’ 79 /108 ANUAL...
  • Page 80 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 11.4 - DISPLAY BOARD COMPONENT LAYOUT (DB 9903_050) 80 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 81: Display Board Parts List

    DL1,DL2,DL3,DL4,DL5,DL6 LED 3mm. JP30,JP31 STRIP12M L1,L2,L3 10uH Q3,Q4,Q5,Q6,Q7,Q8 BC517 RR1,RR2,RR3,RR4,RR5,RR6, 4X1K rete res. RR7,RR8,RR9,RR10,RR11 R0,R1 47R 1W R4,R5,R8 R6,R7 PULSMOZ ST6225 ULN2803 4028 U4,U5,U6,U7 LED_BAR 78L05 4MHz QUARZO PM 300 - FM Broadcasting Transmitter - U ’ 81 /108 ANUAL...

  • Page 82: In-Audio Board

    ELETTRONICA TELECOMUNICAZIONI S.p.A. 12. IN-AUDIO BOARD Fig. 12.1 - IN-AUDIO BOARD ELECTRICAL SCHEMATIC 82 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 83 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 12.2 - IN-AUDIO BOARD COMPONENT LAYOUT (DB 9909_010) PM 300 - FM Broadcasting Transmitter - U ’ 83 /108 ANUAL...

  • Page 84: In-Audio Board Parts List

    100pF CER. C2,C4,C6 4n7F POL. JP1,JP2,JP3,JP4,JP5 STRIP3M CNM20V J2,J3 CNM14V J4,J10,J20 CNM10V J5,J6,J7,J8,J11,J12,J13,J14 BNC90CS L1,L2,L3,L4 10uH PR,PL XLRF90CS RL,RR 5K 10GROP 470R 1/4W TMPX 10K 10GROP TSC1,TSC2,TSC3 1K 10GROP 84 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 85: In-Audio Board Jumpers Setting

    ELETTRONICA TELECOMUNICAZIONI S.p.A. 12.2 IN-AUDIO BOARD JUMPERS SETTING PM 300 - FM Broadcasting Transmitter - U ’ 85 /108 ANUAL...

  • Page 86: Stereo Encoder Board (Option)

    To disable preemph you have to remove both jumpers; to get a 50 us preemph, you have to insert only JP6; if you want a 75 us preemph both JP5 and JP6 must be inserted. 86 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 87 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.1 - STEREO ENCODER GENERAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 87 /108 ANUAL...
  • Page 88 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.2 - L/R PEAK DETECTOR STAGE ELECTRICAL SCHEMATIC 88 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 89 ELETTRONICA TELECOMUNICAZIONI S.p.A. PM 300 - FM Broadcasting Transmitter - U ’ 89 /108 ANUAL...
  • Page 90 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.3 - INPUT STAGE ELECTRICAL SCHEMATIC 90 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 91 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.4 - RIGHT FILTER STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 91 /108 ANUAL...
  • Page 92 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.5 - LEFT FILTER STAGE ELECTRICAL SCHEMATIC 92 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 93 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.6 - OSCILLATOR STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 93 /108 ANUAL...
  • Page 94 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.7 - 19 kHz STAGE ELECTRICAL SCHEMATIC 94 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 95 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.8 - 38 kHz STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - U ’ 95 /108 ANUAL...
  • Page 96 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.9 - OUTPUT STAGE ELECTRICAL SCHEMATIC 96 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 97 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.10 - STEREO ENCODER COMPONENT LAYOUT (DB 9506-001) PM 300 - FM Broadcasting Transmitter - U ’ 97 /108 ANUAL...

  • Page 98: Stereo Encoder Parts List

    100p cer C87,C88,C97,C98 330n poly C99,C100,C101,C103,C104, 4n7 polistirene C105 C127 100p cer np0 C128 680p cer np0 C129 C130,C134 C132,C131 47u TANTALIO C133 1n poly D1,D2,D3,D4 1N4148 JP2,JP1 jumper 98 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 99 R40,R53,R54,R58,R59 31k6 1/4W 1% 50k trim multi 20k 1/4W 1% 825R 1/4W 1% 1k5 1/4W 20k trim multi 15k 1/4W 0R 1/4W R48,R49 10k 1/8W R50,R51 100k 1/8W PM 300 - FM Broadcasting Transmitter - U ’ 99 /108 ANUAL...
  • Page 100 R125 100R 1/4W R126 R127 10k 1/4 W 1% 4001 4024 4013 U4,U5,U12,U13 4035 U6,U16,U23,U24,U25,U26 MC33079 U7A,U7,U18B,U27 NE5532 4066 U9,U10,U11 4053 U14,U15 TL084 U19,U22 TL082 7805 7905 2.432MHz 100 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 101: Contraves Board (Option)

    (that manage PLL) to a microprocessor. The frequency change is fast, because it is only necessary put directly the frequency using the contraves on the front panel. PM 300 - FM Broadcasting Transmitter - U ’ 101 /108...
  • Page 102 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 14.1 - CONTRAVES BOARD ELECTRICAL DIAGRAM 102 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 103: Contraves Boards Parts List

    CONN 20 CONN 10 C2,C1 10p cer C3,C4,C6 C5,C7,C8 100n pol D1 - D22 1N4148 LED d3 JP1,JP2,JP3,JP4,JP5, jumper JP6,JP7,JP8,JP9,JP10 R1,R2,R3,R4 R8,R7 S1,S2,S3,S4,S5 CONTRAVES 78L05 MC68HC705C8P 2-4 MHz PM 300 - FM Broadcasting Transmitter - U ’ 103 /108 ANUAL...

  • Page 104: Troubleshooting

    (should be < 45°C). If under 45°C, allow about 15 minutes for the proper cooling of the equipment; the protection will turn off automatically. If the problem persists, please 104 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...
  • Page 105 Excessive or low deviation - Received audio: very low or - Adjust input audio levels and front panel potentiometer (Fig. badly distorted ) following indications in Chapter 5. PM 300 - FM Broadcasting Transmitter - U ’ 105 /108 ANUAL...

  • Page 106: Xlr Audio Connectors Pinouts

    Connection procedure to connect the audio signal cables to the XLR female connectors for a balanced or unbalanced signal. XLR FEMALE XLR CONNECTOR PIN BALANCED SIGNAL UNBALANCED SIGNAL ground ground " " not connected " " signal 106 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

  • Page 107: Mosfet Replacement

    MOSFET: to do this compress or expand manually the input circuit coil (see Fig. 17.1) to maximize the output power. PM 300 - FM Broadcasting Transmitter - U ’ 107 /108...
  • Page 108 ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 17.1 - MOSFET REPLACEMENT 108 /108 PM 300 - FM Broadcasting Transmitter - U ’ ANUAL...

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