FCC ID: LUHPM300 FM Broadcast Radio Transmitter

DB ELETTRONICA TELECOMUNICAZIONI S.p.A. FM Broadcasting Transmitter Users 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 - USERS MANUAL 1 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. SAFETY NOTICES WARNING To avoid risks of electrical shocks or fire, only qualified personnel should execute the procedures specified in this manual. WARNING When the protective covers of any device or component connected to a 110 / 240 VAC source by a power cord are removed, voltages and currents dangerous to life may be exposed. WARNING Contact with 110 / 240 Volts of alternating current and associated direct current and voltages can be fatal. DANGEROUS RISK OF ELECTRICAL SHOCK DO NOT OPEN CAUTION To reduce the risks of electrical shock, do not remove the cover (or the back). Refer, for servicing, to qualified service personnel. 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 - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. INDEX 1.1 7.1 7.2 8.1 8.2 6.1 6.2 6.3 6.4 9.1 9.2 9.3 9.4 1. PM300 FM TRANSMITTER...................................................................................................................6 GENERAL DESCRIPTION ................................................................................................................6 2. TECHNICAL SPECIFICATIONS........................................................................................................11 3. INSTALLATION ....................................................................................................................................13 4. FREQUENCY SETTING.......................................................................................................................14 5. ADJUSTMENTS AND MEASURES ....................................................................................................16 6. POWER SUPPLY SECTION................................................................................................................18 GENERAL DESCRIPTION ..............................................................................................................18 SWITCHING POWER SUPPLY MODULE PART LIST................................................................22 EQUIP. PWR SUPP. BOARD PARTS LIST (DB 0206_090)..........................................................31 DB 0201_070 PRINTED BOARD PARTS LIST .............................................................................35 7. MODULATION STAGE (SINTEL 96).................................................................................................36 GENERAL DESCRIPTION ..............................................................................................................36 SINTEL 96 MODULATOR PARTS LIST....................................................................................44 8. AMP30 DRIVER STAGE ......................................................................................................................47 GENERAL DESCRIPTION ..............................................................................................................47 AMP30 PRE AMPLIFIER PARTS LIST..........................................................................................50 9. RF AMPLIFIER STAGE.......................................................................................................................51 AMP300 AMPLIFIER BOARD........................................................................................................51 AMP300 AMPLIFIER PARTS LIST ................................................................................................54 LOW PASS FILTER AND DIRECTIONAL COUPLER.................................................................55 L. P. FILTER AND DIR. COUP. PARTS LIST................................................................................56 PROTECTION STAGE......................................................................................................................57 10.1 PROTECTION /CONTROL STAGE N1 PARTS LIST.................................................................67 10.2 PROTECTION /CONTROL STAGE N2 PARTS LIST.................................................................74 11. METER STAGE..................................................................................................................................75 11.1 GENERAL DESCRIPTION ..............................................................................................................75 11.2 MICROPROCESSOR BOARD PARTLIST .....................................................................................78 11.3 DISPLAY BOARD PARTS LIST.....................................................................................................81 IN-AUDIO BOARD.............................................................................................................................82 12.1 IN-AUDIO BOARD PARTS LIST....................................................................................................84 12.2 IN-AUDIO BOARD JUMPERS SETTING ......................................................................................85 STEREO ENCODER BOARD (OPTION) .......................................................................................86 13.1 CHANNELS PRE- EMPHASIS SETTING ......................................................................................86 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 15. 16. 10. 12. 17. 13. 14. PM 300 - FM Broadcasting Transmitter - USERS MANUAL 3 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. FIGURES INDEX FIG. 1.1 - FRONT VIEW....................................................................................................................................8 FIG. 1.2 - REAR VIEW ......................................................................................................................................9 FIG. 1.3 - TOP VIEW .......................................................................................................................................10 FIG. 4.1 - CONTRAVES WEIGHT .................................................................................................................14 FIG. 6.1 - SWITCHING POWER SUPPLY MODULE ELECTRICAL SCHEMATIC A ..........................19 FIG. 6.2 - SWITCHING POWER SUPPLY MODULE ELECTRICAL SCHEMATIC B ..........................20 FIG. 6.3 - SWITCHING POWER SUPPLY MODULE COMPONENT LAYOUT........................................21 FIG. 6.4 EQUIP. PWR SUPP. BOARD GENERAL ELECTRICAL SCHEMATIC....................................26 FIG. 6.5 - EQUIP. PWR SUPP. BOARD +24 V STAGE ELECTRICAL SCHEMATIC...............................27 FIG. 6.6 - EQUIP. PWR SUPP. BOARD-12V STAGE ELECTRICAL SCHEMATIC..................................28 FIG. 6.7 - EQUIP. PWR SUPP. BOARD +12V STAGE ELECTRICAL SCHEMATIC................................29 FIG. 6.8 - EQUIP. PWR SUPP. BOARD COMPONENT LAYOUT (DB 0206_090)....................................30 FIG. 6.9 - DB 0201_070 PRINTED BOARD ELECTRICAL SCHEMATIC..................................................33 FIG. 6.10 - DB 0201_070 PRINTED BOARD COMPONENT LAYOUT......................................................34 FIG. 7.1 - SINTEL 96 MODULATION BOARD GENERAL ELECTRICAL SCHEMATIC ....................37 FIG. 7.2 - PLL STAGE ELECTRICAL SCHEMATIC....................................................................................38 FIG. 7.3 - VCO STAGE ELECTRICAL SCHEMATIC ..................................................................................39 FIG. 7.4 - LF 1 STAGE ELECTRICAL SCHEMATIC ..................................................................................40 FIG. 7.5 - LF 2 STAGE ELECTRICAL SCHEMATIC ..................................................................................41 FIG. 7.6 - FILTER STAGE ELECTRICAL SCHEMATIC .............................................................................42 FIG. 7.7 - SINTEL 96 MODULATION COMPONENT LAYOUT (DB 9604-010) ...................................43 FIG. 8.1 - AMP30 PRE AMPLIFIER ELECTRICAL SCHEMATIC..............................................................48 FIG. 8.2 - AMP30 PRE AMPLIFIER COMPONENT LAYOUT (DB 0110_010A).......................................49 FIG. 9.1 - AMP300 AMPLIFIER ELECTRICAL SCHEMATIC ....................................................................52 FIG. 9.2 - AMP300 AMPLIFIER COMPONENT LAYOUT (DB 9812_001) ................................................53 FIG. 9.3 - L. P. FILTER AND DIR. COUP. ELECTRICAL SCHEMATIC....................................................55 FIG. 9.4 - L. P. FILTER AND DIR. COUP. COMPONENT LAYOUT (DB 9611-005) ................................56 FIG. 10.1 - PROTECTION /CONTROL STAGE N1 GENERAL SCHEMATIC ........................................59 FIG. 10.2 - UNBALANCING PROTECTION STAGE ...................................................................................60 FIG. 10.3 - FWD PROTECTION STAGE........................................................................................................61 FIG. 10.4 - TEMPERATURE PROTECTION STAGE ...................................................................................62 FIG. 10.5 - POWER LIMITING STAGE .........................................................................................................63 FIG. 10.6 - PROTECTION /CONTROL STAGE N1 COMPONENT LAYOUT (DB 9702_004)...............66 FIG. 10.7 - PROTECTION /CONTROL STAGE N2 GENERAL SCHEMATIC.........................................68 FIG. 10.8 - PROTECTION STATUS STAGE .................................................................................................69 FIG. 10.9 - POWER SUPPLY STAGE ............................................................................................................70 FIG. 10.10 - MEASURES ADJ. STAGE..........................................................................................................71 FIG. 10.11 - LED INDICATIONS STAGE......................................................................................................72 FIG. 10.12 - PROTECTION /CONTROL STAGE N2 COMPONENT LAYOUT (DB 9703_011).............73 FIG. 11.1 - MICROPROCESSOR STAGE ELECTRICAL SCHEMATIC (DB 9903_040)...........................76 FIG. 11.2 - MICROPROCESSOR BOARD COMPONENT LAYOUT (DB 9903_040)................................77 FIG. 11.3 - DISPLAY STAGE ELECTRICAL SCHEMATIC (DB 9903_050)..............................................79 FIG. 11.4 - DISPLAY BOARD COMPONENT LAYOUT (DB 9903_050)...................................................80 FIG. 12.1 - IN-AUDIO BOARD ELECTRICAL SCHEMATIC......................................................................82 FIG. 12.2 - IN-AUDIO BOARD COMPONENT LAYOUT (DB 9909_010)..................................................83 FIG. 13.1 - STEREO ENCODER GENERAL SCHEMATIC..........................................................................87 FIG. 13.2 - L/R PEAK DETECTOR STAGE ELECTRICAL SCHEMATIC .................................................88 FIG. 13.3 - INPUT STAGE ELECTRICAL SCHEMATIC .............................................................................90 FIG. 13.4 - RIGHT FILTER STAGE ELECTRICAL SCHEMATIC ..............................................................91 FIG. 13.5 - LEFT FILTER STAGE ELECTRICAL SCHEMATIC.................................................................92 4 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. FIG. 13.6 - OSCILLATOR STAGE ELECTRICAL SCHEMATIC ................................................................93 FIG. 13.7 - 19 KHZ STAGE ELECTRICAL SCHEMATIC.............................................................................94 FIG. 13.8 - 38 KHZ STAGE ELECTRICAL SCHEMATIC.............................................................................95 FIG. 13.9 - OUTPUT STAGE ELECTRICAL SCHEMATIC .........................................................................96 FIG. 13.10 - STEREO ENCODER COMPONENT LAYOUT (DB 9506-001)...............................................97 FIG. 14.1 - CONTRAVES BOARD ELECTRICAL DIAGRAM..................................................................102 FIG. 14.2 - CONTRAVES BOARD COMPONENT LAYOUT (DB 9308-020)...........................................103 FIG. 17.1 - MOSFET REPLACEMENT ........................................................................................................108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL 5 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 1. PM300 FM TRANSMITTER 1.1 GENERAL DESCRIPTION The PM300 is a FM broadcasting transmitter with continuously adjustable output power, 0 to 300W. They can be used as stand-alone complete transmitters or as drivers for high power amplifiers. The PM300 transmitter is built with MOS transistor technology. On the PM300 the use of MOSFET yields:

- Higher efficiency (about 85%);

- High gain (high transconductance and low internal reactive capacitance);

- High thermal stability (negative coefficient for drain current). The output frequency range is between 87.5 and 108 MHz. Frequency setting is made using internal dip switches or contraves on front panel (/C option). The minimum frequency step is 10 kHz. The /S option has a built-in digital stereo coder with stereo separation in excess of 65 dB and a SNR of more than 80 dB. The /P option includes a stereo audio processor with a wide range compression threshold, attack and release time adjustments and full compatibility with digital audio mixing consoles. The /R option consists of full remote control capability with remote adjustments and checks for all main parameters: power output adjustment, ON/OFF command, protections reset, forward and reflected power measure, frequency deviation measure and alarms status. 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 - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. The transmitters have high frequency stability, due to the use of the Digital Phase Locked Loop system and very low drift reference quartz. An internal deviation limiter controls the maximum frequency deviation, thus avoiding adjacent channel interference in case of accidental over modulation. In order to limit over modulation, it is necessary to insert the jumper jp6 on the modulation board (see Fig. 7.7). Valuable characteristics of PM transmitters include intelligent protection circuits to prevent load mismatching (VSWR), to prevent over-temperature (TEMP) and provide an unmatched durability. On the front panel every alarm condition is monitored by LEDS. The multiple led indicators of the front panel enable the full, easy and fast verification of all the main parameters and condition of operation. The output power, the reflected power, the voltage supply of the power amplifier, the frequency deviation, L & R, and MPX are continuously monitored. It is possible, using the front panel adjustments, to control the following settings: output power (PWR adj.), frequency deviation (DEV adj.), transmitting frequency (option /C), manual /remote control selection (option /R) and the mono /stereo selection (option /S). 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 - USERS MANUAL 7 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 1.1 - FRONT VIEW 8 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 1.2 - REAR VIEW PM 300 - FM Broadcasting Transmitter - USERS MANUAL 9 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 1.3 - TOP VIEW 1) Remote control board (option) 2) Equipment Power Supply Board 3) Low Pass Filter Board 4) AMP300 RF Amplifier Board 5) AMP30 Driver Board 6) Ventilation System 7) IN-AUDIO Board 8) Sintel 96 Modulator Board 9) Stereo Encoder Board 10) Switching power supply module (PBIT2180) 11) Meter and microprocessor boards 12) Protection boards (N1, N2) 10 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 2. TECHNICAL SPECIFICATIONS Output frequency range...............................................................................................87.5 to 108 MHz Output frequency setting..................................... synthesized with internal dip switches, 10 kHz step or synthesized by contraves on front panel (/C option) Output impedance ..........................................................................................................................50 W Output connector................................................................................................................................. N Output power........................................................................................................................ 0 to 300 W Harmonics ...................................................................................................................... -80 dB (Typ.) Spurious .......................................................................................................................... -85 dB (Typ) Syncro AM modulation............................................................................................................. -55 dB Asyncro AM modulation........................................................................................................... -60 dB Frequency stability Vs. Line Voltage (15%) ......................................................................................................... 0.7 Hz Aging drift..................................................................................................................... 300 Hz / year MODULATION Mono operation Input level -6 to +10 dBm Input connector...............................................................................................................XLR balanced Input impedance..........................................................................................................................600 W Bandwidth ( 0.25 dB).................................................................................................20 Hz to 15 kHz Attenuation of frequencies 19 kHz ......................................................................................... 50 dB Preemphasis ..........................................................................................................................50/75 msec S/N ratio ( 75 kHz peak dev. with 1 kHz input, 50ms deemphasized).................................... 75 dB THD+N ( 75 kHz peak dev. with 1 kHz input, unweighted).....................................................0.1%

Stereo operation (with stereo coder included in /S model) L & R input level ...........................................................................................................-6 to +10 dBm Input connectors..............................................................................................................XLR balanced Input impedance ..........................................................................................................................600 W Bandwidth ( 0.25 dB).................................................................................................20 Hz to 15 kHz Attenuation of frequencies 19 kHz ........................................................................................ 50 dB Preemphasis ..........................................................................................................................50/75 msec S/N ratio ( 75 kHz peak dev. with 1 kHz input, 50ms deemphasized)..................................... 70 dB THD+N ( 75 kHz peak dev. with 1 kHz input, unweighted).....................................................0.1%

Stereo separation........................................................................................................................ 60 dB PM 300 - FM Broadcasting Transmitter - USERS MANUAL 11 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Stereo operation (with external stereo coder) MPX input level..............................................................................................2.2 Vpp per 75 kHz dev. Input connector ..............................................................................................................................BNC Input impedance...........................................................................................................................10 kW Bandwidth ( 0.25 dB)..............................................................................................20 Hz to 100 kHz POWER REQUIREMENTS Operating voltage............................................................................... 110/220 VAC 10 %, 50/60 Hz Power consumption (at max. output power) ............................................................................. 550 VA Battery operation (option /VDC) ........................................................................................2 x 24 VDC OPERATING CONDITIONS Cooling....................................................................................................air forced, 24 VDC axial fans Temperature range ............................................................................................................-5 to +45 C Humidity ................................................................................................................................95% max. WEIGHT AND DIMENSION Weight (Kg) ...................................................................................................................................... 16 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 - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 3. INSTALLATION To install the PM300 transmitter:

1. Control that the main ON /OFF switch on the rear panel is in the OFF position (labeled 0). 2. Set the correct main supply voltage (220 Vac or 115 Vac) using the PWR supply selector. 3. Connect an antenna or a dummy load to the RF power output connector. 4. Connect the transmitter to the main power supply using the power cord included. 5. Switch ON the transmitter: on the front panel you will see the ON led light

(If the led remains OFF refer to the TROUBLESHOOTING section). 6. Control that the LOCK led on the front panel lights up a few seconds after the power is turned on. If it is not, please refer to the TROUBLESHOOTING section. 7. Adjust the output power using the potentiometer on the front panel using the front panel meter. 8. Select the FWD setting, using the Measure select push-button. 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 - USERS MANUAL 13 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 4. FREQUENCY SETTING 1. Lower the output power to its minimum level. 2. If the exciter is equipped with the EXTERNAL FREQUENCY SETTING (/C option) the selection of the frequency is immediate using the external contraves. The weights of the contrave numbers are as follows;

Fig. 4.1 - CONTRAVES WEIGHT 3. If the transmitter has internal frequency setting, to change frequency open the cover of the modulator board (N 8 Fig. 1.3) and use the internal dip-switches (see Chapter 7). The weight of the internal dip-switches is indicated on the next page. 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 - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. a - Put every dip-switches of the modulator board on the ON position b - Select the OFF position for the dip-switch with the maximum weight, lower than or equal to the frequency wanted (for example f 0 = 98 MHz put on OFF the 81.92 MHz switch) c - Select 98 - 81.92=16.08 MHz, the minimum weight, lower than or equal to 16.08 MHz, is 10.24 MHz; now put off the corresponding switch. d - Select 16.08 - 10.24 = 5.84 MHz, the minimum weight, lower than or equal to 5.84 MHz, is 5.12 MHz, now put off the corresponding switch . e - Select 5.84 - 5.12 = 0.72 MHz, the minimum weight, lower than or equal to 0.72 MHz, is 0.64 MHz, then put off the corresponding switch. f - 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 - USERS MANUAL 15 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 5. ADJUSTMENTS AND MEASURES AF INPUTS DEVIATION ADJUSTMENT For the Left and Right input signals (/S option) use the corresponding XLR female connectors on the rear panel. - see also appendix A for information about the connection The input impedence is 600 W. The transmitter accepts, adjusting input trimmers, input signal levels from -6 dBm to +10 dBm for a 75 kHz peak deviation. For Mono input signal (PM300 without /S option) the input female XLR connector have the same input levels than the stereo amplifier. For MPX input signal (PM300 without /S option) the BNC input connector, labeled MPX IN (10 kW input impedance), accepts 0 dBm MPX signal level. For SCA signals (>53 kHz) use BNC input connectors (1 kW input impedence): the input level for a correct deviation of the main carrier (about 1.25 kHz peak) is 2.2 Vpp. To adjust the peak deviation of the main carrier use the front panel potentiometer: look at the front panel meter and select the DEV measurment by means of the selection button. The front panel allows to monitoring all the main functions and protections of the transmitter. LOCK led: It shows the correct lock of the frequency synthesis circuit (PLL) on the modulator board. STEREO led: It shows the use of the internal stereo generator board (/S option present). This led is related to the switch labeled STEREO/MONO which allows selection of the type of signal to be modulated. 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 - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. REMOTE led: It indicates if the operation of the transmitter can be remote controlled. This selection is made using the switch REMOTE/MANUAL. This switch and the relative led will be unused if the transmitter is not equipped with the remote optional control board. ON led: It shows the ON/OFF state of the transmitter, thus the presence of main power supply. OVERHEAT led: It indicates that the over temperature protection is enable. This protection does not need a RESET because it restores the normal working conditions automatically, when the temperature goes back to normal values. VSWR led: It shows that the VSWR protection is active. This intelligent protection is characterized by an automatic reset delayed by about 2-3 seconds to avoid the risk of accidental intervention. This auto-reset tries to resume to normal operation only 3-4 times, then turns the transmitter off definitively (after the intervention of the VSWR protection, use the RESET push-

button. PWR LIM led: It shown that the output forward power becomes greater than the preset value

(normally 300W). MEASURES 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 - USERS MANUAL 17 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 6. POWER SUPPLY SECTION 6.1 GENERAL DESCRIPTION PM 300 transmitter power supply is composed of the following elements:

n1 switching power supply module (PBIT 2180) to power supply the mosfet amplifier and the equipment power supply board. n1 equipment power supply board (Fig. 6.8) capable of 12 VDC (6A max) and +24 VDC (10A max) to power supply the Protection and control boards, meter stage, Sintel 96 modulator board, AMP30 Driver stage and all optional boards present . WARNING: before substituting a broken switching module it is necessary to disconnect its output and to set the output voltage, without any load, at the right value (22.5v 2%) before reconnecting the switching module output to the other circuits and boards in order to avoid overvoltage roblems. The switching-mode power supply provides:

1. the efficiency is 80% higher hence provides a considerable reduction of the internal heating, thus simplifying the cooling system;

2. a lower thermal and mechanical stress for associated components, such as transformer, diodes, rectifier bridges is inflicted;

3. the power supply voltages at the output of the switching regulators are constant even in case of wide main fluctuations ( 15 %). 18 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.1 - SWITCHING POWER SUPPLY MODULE ELECTRICAL SCHEMATIC A PM 300 - FM Broadcasting Transmitter - USERS MANUAL 19 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.2 - SWITCHING POWER SUPPLY MODULE ELECTRICAL SCHEMATIC B 20 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.3 - SWITCHING POWER SUPPLY MODULE COMPONENT LAYOUT PM 300 - FM Broadcasting Transmitter - USERS MANUAL 21 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 6.2 SWITCHING POWER SUPPLY MODULE PART LIST 22 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PM 300 - FM Broadcasting Transmitter - USERS MANUAL 23 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 24 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PM 300 - FM Broadcasting Transmitter - USERS MANUAL 25 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.4 EQUIP. PWR SUPP. BOARD GENERAL ELECTRICAL SCHEMATIC 26 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.5 - EQUIP. PWR SUPP. BOARD +24 V STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 27 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.6 - EQUIP. PWR SUPP. BOARD-12V STAGE ELECTRICAL SCHEMATIC 28 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.7 - EQUIP. PWR SUPP. BOARD +12V STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 29 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.8 - EQUIP. PWR SUPP. BOARD COMPONENT LAYOUT (DB 0206_090) 30 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. QUANTITY 6.3 EQUIP. PWR SUPP. BOARD PARTS LIST (DB 0206_090) ITEM ____________________________________________________________________________________________ 1 2 3 AK700 2VIE MORS2 1nF NP0 CC2010 100nF POL CP2010 REFERENCE PART 6 2 8 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 2 3 1 2 1 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 CN2,CN3,CN4,CN5,CN6,CN0 C37,C1 C2,C5,C12,C27,C28,C30, C32,C33 C7,C3 C6,C31,C34 C9 C10,C11 C20 C21A,C25 C21,C24 C23 C22 C26 C35 C36 D1 D2 D3 D4 D5 FA1 F1 JP3 JP5 L1 L2 L3 L4 L6 Q1 Q2 RS1 RV1 RV2 R0 R1 R2 R3 R4 R5 R6 R7 R8 R10 R11 R12 R20 R21 R22 R23 R24 1000uF 63V RHOE CEL75D16 100uF 25V CE1025 2n2F MKP 400V C40M 2200uF 50V RHOE CEL75D18 220uF 35V CE2045 100nF CER CP2010 220nF POL CP2010 4n7F POL CP2010 1n5F POL CP2010 330uF 25V CE2045 1uF POL CP2020 100pF NPO CC2010 18V 1W DZ4015 BYV27 DBYV MUR3020 DO247V SB360 TRAD D6020 1N5819 TRAD D4010 FAST2 TRAD FAST2V MURATA TRAD MURATA STRIP10F STRIP10M STRIP5F STRIP5M 130uH TORO12A LT70150 260uH TORO2A LT3595 100uH TORO2A LT2865 10uH TRAD L5015 VK200 TRAD VK200H IRFP150N DO247V BD140 SOT32 +VITEeDADOM3+ALETTA 0.01 SHUNT SH1 22K TRAD T1RV 1K TRAD T1RV 680 4W R8020 100K 1/4W R4010 5.6 1% R3010 22 1/8W R3010 10K 1/8W R3010 56 1/2W R5015 2K7 1/4W R5015 47 1/8W R3010 10 1/8W R3010 37K4 1% R4010 9K09 1% R4010 4K7 1/4W R4010 0.47 2W R7020 100 1/4W R4010 270 1/4W R4010 10 1/2W R5015 1K2 1/4W R4010 PM 300 - FM Broadcasting Transmitter - USERS MANUAL 31 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. ITEM ____________________________________________________________________________________________ REFERENCE QUANTITY PART 52 53 54 55 56 57 1 1 1 1 1 1 R25 SC1 TA1 U1 U2 DB 0201_070 15K 1/4W R4010 47V D10 V3015 150522 TA TA1 L4971 TRAD IC3008 UA78S40 TRAD IC3010 PRINTED BOARD 32 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.9 - DB 0201_070 PRINTED BOARD ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 33 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 6.10 - DB 0201_070 PRINTED BOARD COMPONENT LAYOUT 34 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 6.4 DB 0201_070 PRINTED BOARD PARTS LIST ITEM _______________________________________________________________________ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 31 32 33 34 35 36 37 38 39 40 41 42 43 44 REFERENCE C1 C2,C3,C4,C8,C9,C10,C17, C19,C24,C28,C29 C6,C13,C15,C23,C26,C27 C7,R11,C14,C18,C22,C25 C11 C12 C16 C31,C21 C33 D5,D1 D2,D6 D3,D4 D7,D9,D10 D8 JP3 JP5 P1 Q1 Q2 R2,R25,R27 R3 R21,R5 R6,R12,R20 R7 R8,R29,R30,R33 R9 R10,R35 R13 R14 R15 R16,R23 R17 R18,R22,R26 R19 R28 R31 R32 R42,R34 R36,R37,R41 R43 R44,R45 U1 U2 U3 U4 PART 10nF X7R 0805 100nF X7R 1206 1nF X7R 0805 N.C. X7R 0805 220pF C0G 1206 4n7F X7R 1206 100nF X7R 1206 1nF X7R 1206 2n2F X7R 1206 LL4148 MMELF DIODO 3V3 MMELF ZENER BAT85 MMELF DIODO BAV103 MMELF DIODO 18V MMELF ZENER STRIP10M MASCHIO 90 STRIP5M MASCHIO 90 10K 10GRO PANNELLO BC847 SMD SOT23 BC857 SMD SOT23 56K2 SMD1% 0805 470K SMD 0805 10K SMD 0805 0 SMD 0805 10K SMD 0805 10K0 SMD1% 0805 100 SMD 0805 1K SMD 0805 5K6 SMD1% 0805 3K32 SMD1% 0805 8K2 SMD 0805 150K SMD1% 0805 20K0 SMD1% 0805 10K0 SMD1% 1206 4K7 SMD 0805 33K0 SMD1% 1206 2K4 SMD1% 0805 120K SMD1% 0805 4K7 SMD 1206 330 SMD 1206 47K SMD 1206 100 SMD 1206 LM324 SMD SO14 UC3842 SMD SO8 TL431 SOT23/TO92 L6384 SMD SO8 QUANTITY 1 11 6 6 1 1 1 2 1 2 2 2 3 1 1 1 1 1 1 3 1 2 3 1 4 1 2 1 1 1 2 1 3 1 1 1 1 2 3 1 2 1 1 1 1 PM 300 - FM Broadcasting Transmitter - USERS MANUAL 35 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 7. MODULATION STAGE (Sintel 96) 7.1 GENERAL DESCRIPTION The new modulator board SINTEL 96 allows a high quality direct carrier modulation accepting a composite stereo (MPX) or a mono input signal with up to 3 SCA subcarriers (for example RDS, ARI, ...). The mono input signal is filtered by a 7th order elliptic filter with a very flat response (20Hz to 15kHz with 0.25 dB) and an optimum out of band attenuation (>50 dB for frequencies higher than 19 kHz), then the signal is amplified (or attenuated) and passed to the VCO oscillator for the FM carrier modulation. The VCO is controlled by a digital PLL circuit with a high stability quartz reference to obtain a very stable synthetized oscillation: the frequency setting is customizeable using on board dip-switches (the minimum step size is 10 kHz). The composite stereo signal and the SCA subcarriers are just amplified or attenuated by the correct modulation depth adjustment before going through the VCO stage: the stereo performances of SINTEL 96 are excellent, (stereo separation >60 dB from 20Hz to 15 kHz, SNR > 80 dB). Before the VCO stage, an adjustable and bypassable deviation limiter prevents the FM carrier from an excessive modulation depth and adjacent channel interference according to all the international standards (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 - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.1 - SINTEL 96 MODULATION BOARD GENERAL ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 37 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.2 - PLL STAGE ELECTRICAL SCHEMATIC 38 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.3 - VCO STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 39 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.4 - LF 1 STAGE ELECTRICAL SCHEMATIC 40 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.5 - LF 2 STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 41 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.6 - FILTER STAGE ELECTRICAL SCHEMATIC 42 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 7.7 - SINTEL 96 MODULATION COMPONENT LAYOUT (DB 9604-010) PM 300 - FM Broadcasting Transmitter - USERS MANUAL 43 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 7.2 SINTEL 96 MODULATOR PARTS LIST ITEM __________________________________________________________________ 1 2 3 PART SMB SMB DA STAMPATO AMP4 100n POLY QUANTITY 1 2 18 REFERENCE CN1 CN3,CN2 C1,C16,C18,C25,C26,C36, C37,C84,C94,C95,C100, C101,C108,C111,C114,C116,C118,C119 C2 C3 C4,C5,C8,C12,C21 C6,C7 C9,C14,C102 C10,C19,C59,C61,C63,C85, C86,C120,C121 C13 C15,C17,C23,C33,C39,C40, C41,C42,C43,C44,C45,C46,C47,C48 C22,C31,C79,C99,C115, C117 C27,C28,C29,C82,C83 C30,C66,C67,C70,C105, C112,C122 C32 C34 C35 C51,C49 C50,C52,C56,C58,C60,C62, C109,C110 C53,C71 C57 C64,C65 C69,C91,C92 C72,C73,C75,C77,C80,C96, C97,C98 C87 C88,C89,C90 C126,C93 C103 C106 C107 C113 C125 C127 C128 D3,D12,D13,D15,D16,D17, D18 D4,D6,D9,D10 D5 D8,D7 JP6 JP8,JP7 J1 15p 10-60p 10n POLY 4n7 POLY 1u POLY 10n CER 1u POLY 1n CER 10u ELETT.25V 1u ELETT.25V 10p CER 47u elettrol. tantalio 33p CER 22p CER 47p CER 100p CER 330n poly 4p7 cer 100u 25V 100n cer 3n3 CER 220p CER 4n7 100p 100n CP1 100n 68p CER 1p CER 22p 1u 10n multistrato 1N4148 5V1 ZENER LED BB809 JUMPER JUMPER X2 JUMPER CON20 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 1 1 5 2 3 9 1 14 6 5 7 1 1 1 2 8 2 1 2 3 8 1 3 2 1 1 1 1 1 1 1 7 4 1 2 1 2 1 44 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL QUANTITY 2 1 2 1 1 1 3 1 2 5 1 1 1 4 1 2 1 1 3 1 5 1 14 ITEM _______________________________________________________________________________ 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PART REFERENCE CON14 J4,J3 L1 INDUCTOR 100n INDUTT ASSIALE L2,L15 10R 1/2W 1/2 W L3 L9 10uH L10 10uH R1 L11,L12,L14 10uH INDUTT. 10uH INDUTT. L13 BC557 Q2,Q3 Q4,Q5,Q6,Q7,Q8 BFY90 Q9 BC307 Q10 BC237 22K 1/8W R?

27K4 1% RES 1/8W R1,R2,R3,R4 R5 48K7 1% RES 1/8W R7,R6 27K RES 1/8W R8 22K RES 1/8W 48K7 1%

R9 R10,R24,R73 1M RES 1/8W R11 50K Trimmer multigiri R12,R34,R38,R42,R108 47K RES 1/8W R15 2.2K RES 1/8W R16,R18,R22,R56,R74,R103, 10K RES 1/8W R106,R130,R131,R132,R133, R134,R135,R136 R17 R20,R29 R21,R31,R35,R124 R23 R25,R37,R39,R41,R54,R58, R60,R75,R79,R80,R111,R118,R119,R121 R26,R69 R27 R28 R30,R36,R40,R62 R33,R32 R43 R45,R44 R47,R46 R48,R49 R138,R50 R51,R137 R52 R53,R57,R71,R72 R55,R59,R61 R66,R110 R109,R68 R77 R78 R81 R82 R83 R84 R85,R91,R97,R115,R116,R117 R87 R88,R94 560 RES 1/8W 1K5 RES 1/8W 470 RES 1/8W 6.8K RES 1/8W 1K RES 1/8W 5k6 RES 1/8W 330 RES 1/8W 15k RES 1/8W 33k RES 1/8W 100 RES 1/8W 680R 1/8W 31K6 1% 1/4W 10K 1% 1/4W 169K 1% 1/4W 5K6 1M 3K3 RES 1/8W 4K7 RES 1/8W 180K RES 1/8W 4K7 TRIM MONOGIRO PICC. 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%

3k01 RES_1/4W_1%

3k3 RES_1/8W 2k trim multi 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 1 2 4 1 14 2 1 1 4 2 1 2 2 2 2 2 1 4 3 2 2 1 1 1 1 1 1 6 1 2 PM 300 - FM Broadcasting Transmitter - USERS MANUAL 45 /108 ITEM _____________________________________________________________________________ 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PART REFERENCE 4k64 RES_1/4W_1%

R89 R90 2k74 RES_1/4W_1%

2K2 RES_1/8W R93,R98 4k02 RES_1/4W_1%

R95 R96 1k91 RES_1/4W_1%

R100 2k RV64W R101 2k61 RES_1/4W_1%

301k 1/4W 1%

R102 2K2 RES 1/8W R104 R105 2K2 R107 10K TRIM MONOGIRO PICC. R112 68K RES 1/8W 12K1 R113 9K53 RES 1/8W R114 R120 10R RES 1/8W R122 68 RES 1/8W R123 10 RES 1/8W 47 RES 1/8W R125 R126 220R RES 1/8W R128 100R RES 1/8W R129 330R RES 1/8W SW2,SW1 DIP SW 8 TP TP1,TP4,TP5,TP6,TP7,TP8, TP10 U1 MC145152 U2,U19 TL082 78L05 U3 MB501L U4 U6 78L08 U10,U16,U17,U18 TL084 U15 74HC14 2.56MHz Y1 QUANTITY 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 7 1 2 1 1 1 4 1 1 46 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 8. AMP30 DRIVER STAGE 8.1 GENERAL DESCRIPTION The pre amplifier/driver stage is realized by the new 30W MOSFET amplifier board

(DB 0110_010A). This board is basically composed of four amplification WIDE BAND stages. The first stage uses a BFQ19 transistor to amplify the input level. The second and the third transistors are 2N4427. The last amplification stage uses a BLF245 MOSFET to obtain an output RF power 30 W maximum. The P3 trimmer (see Fig. 8.2) in the AMP30 board allows to adjust the mosfet bias current. 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 - USERS MANUAL 47 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 8.1 - AMP30 PRE AMPLIFIER ELECTRICAL SCHEMATIC 48 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 8.2 - AMP30 PRE AMPLIFIER COMPONENT LAYOUT (DB 0110_010A) PM 300 - FM Broadcasting Transmitter - USERS MANUAL 49 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 8.2 AMP30 PRE AMPLIFIER PARTS LIST ITEM _____________________________________________________________________________ 2 3 4 5 6 8 9 10 11 12 13 14 15 16 17 18 19 20 21 26 27 28 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 PART 47uF C1 100uF C2,C7,C9,C35,C59 C3,C4,C5,C23,C24,C39,C51 10nF 10nF C6,C53,C65 C11,C12,C36,C37 100pF C16 47pF C20,C32,C40,C42 10uF 100nF C30,C21 1nF C27,C28,C29,C33 C31,C34,C52 1nF C38 10pF C41 330pF 1nF C54,C44 33pF C45 C50 100uF C55 82pF 3p3F C57 5V1 DZ1 D2,D1 LL4148 L1,L2,L5,L9,L11,L12 VK200 L3 15nH CU x BOBINE IN ARIA L6,L7,L10 5K P2,P3 Q1 BFQ19 Q2 BDX53 Q3 2N3866 / 2N4427 2N4427 Q4 BLF245 Q5 Q6 BC857 R1,RX,R0 0 R2 100 1K5 R14,R3 R4 100 R5 22K R6,R8,R42 1K 56 R7 47 R7A R10,R12,R15,R16 300 R11 18 R13 150 10 R17 10K R20,R21,R24 R22 220K R23 100K R43A,R43 220 2K7 R44 220 R59 U1 LM7815 U2 NE555 QUANTITY REFERENCE 1 5 7 3 4 1 4 2 4 3 1 1 2 1 1 1 1 1 2 6 1 3 2 1 1 1 1 1 1 3 1 2 1 1 3 1 1 4 1 1 1 3 1 1 2 1 1 1 1 p=3.5mm f=8mm p=2.5mm f=6,5mm 1206 1210 1206 1210 p=2.5mm f=5,5mm 1206 1206 1206 1210 1206 1210 1210 p=3.5mm f=8mm 1210 1210 SOD80 MMELF VK200SMD 1210 1GRV SOT89 TO220 TO205 TO205 SOT123A SOT23 R4010 1206 1206 P=16mm f=4mm 1206 1206 1206 1206 1206 1206 1206 1206 1206 1206 1206 1206 1206 P=20mm f=5mm TO220 SO08 35V 25V X7R COG COG TEKELEC 25V X7R X7R COG TEKELEC COG TEKELEC TEKELEC 35V TEKELEC TEKELEC ZENER DIODO TRAD SMD SMD SMD TRAD TRAD SMD SMD 1/4W SMD SMD 2W SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD SMD 4W TRAD SMD 5x5mm 50 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 9. RF AMPLIFIER STAGE 9.1 AMP300 AMPLIFIER BOARD The AMP300 amplifier shown in Fig. 9.2 is implemented with MOS transistors Philips BLF278 or equivalent. The BLF278 offer a better performance than a BJT implementation. The BLF278 technical data (for class C operation) is:

- 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 - USERS MANUAL 51 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 9.1 - AMP300 AMPLIFIER ELECTRICAL SCHEMATIC 52 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 9.2 - AMP300 AMPLIFIER COMPONENT LAYOUT (DB 9812_001) PM 300 - FM Broadcasting Transmitter - USERS MANUAL 53 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 9.2 AMP300 AMPLIFIER PARTS LIST PART QUANTITY REFERENCE ITEM _____________________________________________________________________________ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 DB971202 DB9812-001 DB9704-015 10pF CER 150pF CER 56pF CER 100nF 200V 10nF 200V 1nF HQ300V 100uF 63V 5,6pF HQ 6 TURNS 17cm 0.8RS FERR2TUBE BLF278 150 kR 1206 22R4W CPFXCS 2TUBEOTTx2cm+TEFLONRSx20cm CS1 CS2 CS3 C0 C1 C2 C8,C3 C4 C5,C6,C7 C9 C10 L1 L2 Q1 R5 R6,R7,R8,R9 TP1,TP2 TR1 1 1 1 1 1 1 2 1 3 1 1 1 1 1 1 4 2 1 54 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB 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 - USERS MANUAL 55 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 9.4 - L. P. FILTER AND DIR. COUP. COMPONENT LAYOUT (DB 9611-005) PART 9.4 L. P. FILTER AND DIR. COUP. PARTS LIST ITEM QUANTITY REFERENCE ________________________________________________________ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15p 18p 10p 33p 1n 1N4148 BAR10 2 TURNS WITH COPPER WIRE 1.5mm 5 TURNS WITH COPPER WIRE 1.5mm 3 TURNS WITH COPPER WIRE 1.5mm 4 TURNS WITH COPPER WIRE 1.5mm 100R 1K 1K C1,C4,C5,C9 C2,C3 C12 C7 C6,C8,C10,C11 D3 D1 L1,L2,L6 L3,L8 L4,L7,L9 L5,L10 R2,R3 R4,R5 R6 4 2 1 1 2 1 1 3 2 3 2 2 2 1 56 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 10. 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 and REFL signals coming from the directional coupler. These are DC voltages that correspond to output forward and reflected power levels. 2) The V+ signal. It is a 45 VDC voltage that power supply the protection board. 3) The Measure INSTR signal represents the selected measure that is visualized on the front panel meter. 4) VPA signals are the DC power supply voltages (@ 45V in normal operation) of the 300W power module. 5) IPA signals are the DC power supply current (@ 9A in normal operation) of the 300W power module. 6) The TEMP signal is connected to a temperature sensor (bimetallic lamina type) mounted on the heat sink. This sensor works like a contact normally closed to ground, that opens when the heat sink temperature becomes higher than 70C.It closes again when the temperature decreases below 45C. 7) GATE signal is a control voltages connected to the MOSFET gate on the 300W-power amplifier. The gate voltage control allows to realize protection and AGC controls. PM 300 - FM Broadcasting Transmitter - USERS MANUAL 57 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. The equipment has three protections:

1) VSWR protection: When the output reflected power becomes greater than a preset value

(normally 30W), the output power reduces to maintain the reflected power below the preset value. For changing the preset value, adjust the R40 trimmer (Fig. 10.6). When the protection is active the front panel VSWR led lights on. 2) PWR LIMIT protection: When the output forward power becomes greater than a preset value

(normally 300W), e.g. because of a high driving power, the amplifier gain reduces to maintain a stable output power level (+/-2%). For changing the preset value, adjust the R47 trimmer (Fig. 10.6). When the protection is active the front panel PWR LIM led lights on. 3) Temperature protection: When the heat sink temperature becomes higher than 70C the output power decreases to a preset value (normally 40W). For changing the preset output value for temperature protection, adjust the R121 trimmer (Fig. 10.6). When the protection is active the front 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 - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.1 - PROTECTION /CONTROL STAGE N1 GENERAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 59 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.2 - UNBALANCING PROTECTION STAGE 60 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.3 - FWD PROTECTION STAGE PM 300 - FM Broadcasting Transmitter - USERS MANUAL 61 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.4 - TEMPERATURE PROTECTION STAGE 62 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.5 - POWER LIMITING STAGE PM 300 - FM Broadcasting Transmitter - USERS MANUAL 63 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 64 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PM 300 - FM Broadcasting Transmitter - USERS MANUAL 65 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.6 - PROTECTION /CONTROL STAGE N1 COMPONENT LAYOUT (DB 9702_004) 66 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 10.1 PROTECTION /CONTROL STAGE N1 PARTS LIST ITEM QUANTITY _______________________________________________________________________ 1 REFERENCE PART 67 1n CER 100n POLY 1u POLY 1n POLY 1N4148 C1,C2,C3,C4,C5,C6,C7,C8, C9,C10,C11,C12,C13,C14, C15,C16,C17,C18,C25,C26, C28,C29,C30,C31,C32,C34, C35,C36,C70,C71,C72,C74, C75,C76,C80,C84,C88,C102, C105,C106,C107,C108,C109, C114,C115,C116,C117,C118, C119,C120,C121,C123,C124, C125,C126,C127,C128,C129, C130,C131,C132,C133,C134, C135,C136,C137,C138 C19,C20,C21,C22,C37,C38, C39,C40,C68,C69 C27,C33,C73 C122 D5,D6,D7,D8,D9,D10,D11, D13,D14,D21,D23,D24,D25, D26 FIS1,FIS2 JP1 JP2,JP3 J1 J2 J3,J4,J5,J6,J7,J8,J9 Q2,Q3 R5,R6,R7,R22 R8,R9,R10,R11,R12,R13, R14,R15,R16,R17,R18,R19, R21,R24,R26,R119,R151, R152,R153,R154 R20,R27,R28,R35,R43,R116, 4K7 RES 1/8W R124 R23,R40,R47,R121 R25,R127 R34,R36,R42,R44 R87,R37 R38,R46,R130 R39 R41,R48,R117 R45,R128,R129 R53 R118,R159 R120 R122 R123 R125 R126 U1,U2,U3 U9 U10 5K TRIM MULTIG. 1K RES 1/8W 10K RES 1/4W 1%

3K3 RES 1/4W RES 1/8W 1M 5K62 RES 1/4W 1%

1K RES 1/4W 1%

RES 1/4W 1K RES 1/4W 1%

20K 2K2 RES 1/4W 8K66 RES 1/4W 1%

RES 1/8W 3K3 RES 1/8W 22K 15K RES 1/8W 47K RES 1/8W TL084 79L05 TL082 JUMPERx2 JUMPERx3 FIS JUMPERx2 JUMPERx3 CON24 CON20 PINSTRIP Fx2 PINSTRIP Fx2 BC237 33K RES 1/8W 10K RES 1/8W CON AMP 24 CON FLAT 20 PM 300 - FM Broadcasting Transmitter - USERS MANUAL 67 /108 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 10 3 1 14 2 1 2 1 1 7 2 4 20 7 4 2 4 2 3 1 3 3 1 2 1 1 1 1 1 3 1 1 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.7 - PROTECTION /CONTROL STAGE N2 GENERAL SCHEMATIC 68 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.8 - PROTECTION STATUS STAGE PM 300 - FM Broadcasting Transmitter - USERS MANUAL 69 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.9 - POWER SUPPLY STAGE 70 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.10 - MEASURES ADJ. STAGE PM 300 - FM Broadcasting Transmitter - USERS MANUAL 71 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.11 - LED INDICATIONS STAGE 72 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 10.12 - PROTECTION /CONTROL STAGE N2 COMPONENT LAYOUT (DB 9703_011) PM 300 - FM Broadcasting Transmitter - USERS MANUAL 73 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PART QUANTITY REFERENCE Elett.50V CER Elett.25V Elett.63V POLY CER POLY Elett.25V POLY LED3MM Diodo 10.2 PROTECTION /CONTROL STAGE N2 PARTS LIST ITEM ______________________________________________________________________ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 C54,C132 C55,C92,C93,C94,C98,C110, C111,C112,C113,C131 C56,C57,C64,C128,C129, C133,C134 C58 C59,C60,C62,C130,C135 C61,C127 C65,C66,C82,C83,C103, C104 C77,C81,C85,C89 C95,C96,C97,C99 D15,D17,D18,D19,D20,D22 D16,D27 FIS1,FIS2,FIS3,FIS4 J3,J4,J5 L1,L9 L3,L4,L5,L6,L7,L8 Q1,Q4,Q5,Q6,Q7 R29,R50,R52,R133 R30,R49,R51,R132,R140, R144,R145,R150 R88,R89,R90 R91 R92 R93 R95,R96,R97,R98,R99,R100, R135,R136,R137,R138 R102,R141,R142,R147,R148, R155,R156,R157,R158 R103,R111 R104,R105,R106,R109 R107,R108 R110,R112,R113,R131 R114,R115,R134 R139,R143,R146,R149 R160 R161 R162,R163,R164,R165 U11,U4 U7,U12 U8,U13 10u 1n 100u 22u 10n 100p 100n 10u 1u LED 1N5819 FIS 100u 150u BC237 1M 1K 1K5 100R 1K54 16K9 1K 22K 1K 150K 15K 4K7 1K2 47K 1K 8K66 1R TL084 UA78S40 LT1054 INDUTT INDUTT RES 1/8W RES 1/8W RES 1/4W RES 4W RES 1/4W 1%

RES 1/4W 1%

TRIM RO RES 1/8W RES 1/4W RES 1/8W RES 1/8W RES 1/8W RES 1/4W RES 1/8W RES 1/4W 1%

RES 1/4W 1%

RES 1/4W 2 10 7 1 5 2 6 4 4 6 2 4 3 2 6 5 4 8 3 1 1 1 10 9 2 4 2 4 3 4 1 1 4 2 2 2 PINSTRIP Mx2 PINSTRIP Mx2 74 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 11. 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 - USERS MANUAL 75 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 11.1 - MICROPROCESSOR STAGE ELECTRICAL SCHEMATIC (DB 9903_040) 76 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 11.2 - MICROPROCESSOR BOARD COMPONENT LAYOUT (DB 9903_040) PM 300 - FM Broadcasting Transmitter - USERS MANUAL 77 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 11.2 MICROPROCESSOR BOARD PARTLIST PART REFERENCE ITEM QUANTITY __________________________________________________________________________ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 C17,C18,C19,C20,C25 C21,C23,C24 C22 DL7,DL8,DL9 D1,D2,D3 JP1,JP2 JP10,JP11 JP21,JP20 J1,J2,J3 J4 J6 J7 R9,R10,R12,R13,R16,R17,R18 P1 R11,R14,R19,R20,R21,R22 P2,P3,P4,P5 Q2,Q1 R15 S1,S2 U8 U9 100Nf mul. 1nF cer. 1uF 50V ele. LED 3mm. 1N4148 STRIP2M STRIP7M STRIP5M CNM20V CNM14V AMP4 CNM10V 1K 1K 10K 10K BC547 680R C&K TL082 74HC32 5 3 1 3 3 2 2 2 3 1 1 1 7 1 6 4 2 1 2 1 1 78 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 11.3 - DISPLAY STAGE ELECTRICAL SCHEMATIC (DB 9903_050) PM 300 - FM Broadcasting Transmitter - USERS MANUAL 79 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 11.4 - DISPLAY BOARD COMPONENT LAYOUT (DB 9903_050) 80 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PART 11.3 DISPLAY BOARD PARTS LIST ITEM QUANTITY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 REFERENCE C1,C8,C9,C10,C11,C12,C13 1nF cer. C14,C15 C2 C3 C4,C16 C5,C6 C7 DL1,DL2,DL3,DL4,DL5,DL6 JP30,JP31 L1,L2,L3 Q3,Q4,Q5,Q6,Q7,Q8 RR1,RR2,RR3,RR4,RR5,RR6, 4X1K rete res. RR7,RR8,RR9,RR10,RR11 R0,R1 R2 R3 R4,R5,R8 R6,R7 SW1 U1 U2 U3 U4,U5,U6,U7 U10 Y1 47R 1W 4M7 47K 4K7 1K PULSMOZ ST6225 ULN2803 4028 LED_BAR 78L05 4MHz QUARZO 1uF 50V ele. 10uF 50v ele. 100nF mul. 22pF cer. 1u pol. LED 3mm. STRIP12M 10uH BC517 9 1 1 2 2 1 6 2 3 6 11 2 1 1 3 2 1 1 1 1 4 1 1 PM 300 - FM Broadcasting Transmitter - USERS MANUAL 81 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 12. IN-AUDIO BOARD Fig. 12.1 - IN-AUDIO BOARD ELECTRICAL SCHEMATIC 82 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 12.2 - IN-AUDIO BOARD COMPONENT LAYOUT (DB 9909_010) PM 300 - FM Broadcasting Transmitter - USERS MANUAL 83 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PART 12.1 IN-AUDIO BOARD PARTS LIST ITEM QUANTITY REFERENCE ________________________________________________________ 1 100pF CER. 2 4n7F POL. STRIP3M 3 4 CNM20V 5 CNM14V 6 CNM10V BNC90CS 7 8 10uH XLRF90CS 9 5K 10GROP 10 11 470R 1/4W 12 10K 10GROP 1K 10GROP 13 C1,C3,C5,C7 C2,C4,C6 JP1,JP2,JP3,JP4,JP5 J1 J2,J3 J4,J10,J20 J5,J6,J7,J8,J11,J12,J13,J14 L1,L2,L3,L4 PR,PL RL,RR R1 TMPX TSC1,TSC2,TSC3 4 3 5 1 2 3 8 4 2 2 1 1 3 84 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 12.2 IN-AUDIO BOARD JUMPERS SETTING PM 300 - FM Broadcasting Transmitter - USERS MANUAL 85 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 13. STEREO ENCODER BOARD (Option) 13.1 CHANNELS PRE- EMPHASIS SETTING RIGHT CHANNEL PRE-EMPHASIS

(see Fig. 13.3 and Fig. 13.10) To change the pre-emphasis, you need to set (or change position of) the JP3, JP4 jumpers on the STEREO encoder board. To disable preemph you have to remove both jumpers; to get a 50 us preemph, you have to insert only JP3; if you want a 75 us preemph both JP3 and JP4 must be inserted. LEFT CHANNEL PRE-EMPHASIS

(see Fig. 13.3 and Fig. 13.10) To change the pre-emphasis, you need to set (or change position of) the JP5, JP6 jumpers on the STEREO encoder board. 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 - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.1 - STEREO ENCODER GENERAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 87 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.2 - L/R PEAK DETECTOR STAGE ELECTRICAL SCHEMATIC 88 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PM 300 - FM Broadcasting Transmitter - USERS MANUAL 89 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.3 - INPUT STAGE ELECTRICAL SCHEMATIC 90 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.4 - RIGHT FILTER STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 91 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.5 - LEFT FILTER STAGE ELECTRICAL SCHEMATIC 92 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.6 - OSCILLATOR STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 93 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.7 - 19 kHz STAGE ELECTRICAL SCHEMATIC 94 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.8 - 38 kHz STAGE ELECTRICAL SCHEMATIC PM 300 - FM Broadcasting Transmitter - USERS MANUAL 95 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.9 - OUTPUT STAGE ELECTRICAL SCHEMATIC 96 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 13.10 - STEREO ENCODER COMPONENT LAYOUT (DB 9506-001) PM 300 - FM Broadcasting Transmitter - USERS MANUAL 97 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 13.2 STEREO ENCODER PARTS LIST PART ITEM _______________________________________________________________ 220n poly 1 2 56p cer np0 100n poly 3 QUANTITY 3 1 38 REFERENCE C64,C65,C135 C1 C2,C3,C4,C10,C13,C14,C15, C16,C17,C22,C23,C24,C25, C26,C27,C28,C29,C36,C37, C51,C52,C53,C54,C55,C56, C57,C58,C59,C66,C69,C81, C82,C83,C84,C85,C86,C89, C90 C8 C9 C11,C44 C12 C20,C21 C38 C39 C40 C41 C42,C107,C108,C109,C110, C111,C112,C113,C114,C117, C118,C119,C120,C121,C122, C123,C126 C43,C61 C45,C49 C46 C47,C63 C48 C62,C50 C60 C67,C68,C79,C80,C91,C92, C95,C96,C115,C116,C124, C125 C70,C71,C77,C78 C72,C73,C75,C76 C74,C102,C106 C87,C88,C97,C98 C99,C100,C101,C103,C104, C105 C127 C128 C129 C130,C134 C132,C131 C133 D1,D2,D3,D4 JP2,JP1 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 1 1 2 1 2 1 1 1 1 17 2 2 1 2 1 2 1 12 4 4 3 4 6 1 1 1 2 2 1 4 2 33p cer np0 10-60p orange 10p cer np0 18p cer np0 330p cer 3p3 cer np0 5p6 cer np0 27p cer np0 47p cer np0 3n3 polistirene 82p cer np0 470p polistirene 330p polistirene 68p cer np0 15p cer np0 120p cer np0 3-18p red 10u tant 25V 100p 10p cer 100p cer 330n poly 4n7 polistirene 100p cer np0 680p cer np0 10p 3n3 47u TANTALIO 1n poly 1N4148 jumper 98 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL G6H-2-100 OMRON 22Z3K3 12V DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PART QUANTITY REFERENCE ITEM _________________________________________________________________ 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 JP6,JP3 JP5,JP4 J2,J1 J3,J4 L5 L1,L2,L3,L4 RL1 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11,R68,R75 R12 R13,R80,R82,R83,R102, R104,R106 R14 R15 R16 R17,R30,R55,R76 R18 R19,R26 R20,R25 R21,R24 R22,R23 R27,R63,R64,R67,R69,R70, R74 R28,R29 R31 R32 R33 R34 R35,R36 R37 R39,R38 R40,R53,R54,R58,R59 R41 R42 R43 R44 R45 R46 R47 R48,R49 R50,R51 jumper ON/OFF jumper 50/75us CON14 CON20 10uH ind. assiale 10uH 1k 1/8W 1M 1/8W 11k 1/4W 1%

11k5 1/4W 1%

12k4 1/4W 1%

14k3 1/4W 1%

17k4 1/4W 1%

23k2 1/4W 1%

37k4 1/4W 1%

113k 1/4W 1%

9k53 1/4W 1%

8k66 1/4W 1%

2k trim multi 511R 1/4W 1%

5OOR trim multi 487R 1/4W 1%

4k7 1/8W 10k 1/4W 324k 1/4W 1%

115k 1/4W 1%

75k 1/4W 1%

64k9 1/4W 1%

12k1 1/4W 1%

2k15 1/4W 1%

6k81 1/4W 1%

13k 1/4W 1%

10k5 1/4W 1%

909R 1/4W 1%

1k47 1/4W 1%

5k trim multi 10k 1/4W 1%

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 10k 1/8W 100k 1/8W 2 2 2 2 1 4 1 1 1 1 1 1 1 1 1 1 1 3 1 7 1 1 1 4 1 2 2 2 2 7 2 1 1 1 1 2 1 2 5 1 1 1 1 1 1 1 2 2 PM 300 - FM Broadcasting Transmitter - USERS MANUAL 99 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. PART QUANTITY REFERENCE ITEM __________________________________________________________________ 83 84 85 86 87 88 89 680R 1/4W 10k trim multi 2k2 1/8W 560R 1/4W 169k 1/4W 1%

22k 1/8 W 3k01 1/4W 1%

2 1 1 2 4 2 12 R52,R60 R56 R57 R61,R62 R65,R66,R71,R77 R73,R72 R78,R81,R93,R94,R95,R98, R100,R103,R105,R115,R116, R118 R79,R101 R84,R85,R107,R108 R86,R91,R99,R113 R87,R109 R88,R110 R89,R111 R90,R112 R92,R114 R96,R117 R97,R119 R122 R123 R124 R125 R126 R127 U1 U2 U3 U4,U5,U12,U13 U6,U16,U23,U24,U25,U26 U7A,U7,U18B,U27 U8 U9,U10,U11 U14,U15 U19,U22 U20 U21 Y1 3k3 1/4W 2k2 1/4W 301k 1/4W 1%

3k57 1/4W 1%

4k64 1/4W 1%

4k02 1/4W 1%

2k61 1/4W 1%

1k91 1/4W 1%

2k74 1/4W 1%

536R 1/4W 1%

0R 5k6 100R 1/4 W 100R 1/4W 4K7 10k 1/4 W 1%

4001 4024 4013 4035 MC33079 NE5532 4066 4053 TL084 TL082 7805 7905 2.432MHz 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 2 4 4 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 4 6 4 1 3 2 2 1 1 1 100 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 14. CONTRAVES BOARD (Option) 14.1 GENERAL DESCRIPTION On the synthesized board the dip-switches are changed with a 20 pin connector, so that it is possible connect with a flat type cable this circuit (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 - USERS MANUAL 101 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 14.1 - CONTRAVES BOARD ELECTRICAL DIAGRAM 102 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 14.2 - CONTRAVES BOARD COMPONENT LAYOUT (DB 9308-020) 14.2 CONTRAVES BOARDS PARTS LIST ITEM QUANTITY REFERENCE ______________________________________________________ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PART CONN 20 CN1 CONN 10 CN2 10p cer C2,C1 10u C3,C4,C6 100n pol C5,C7,C8 D1 - D22 1N4148 LED d3 D21 JP1,JP2,JP3,JP4,JP5, jumper JP6,JP7,JP8,JP9,JP10 R1,R2,R3,R4 R5 R6 R8,R7 S1,S2,S3,S4,S5 U1 U2 X1 47K 1k 2M2 10k CONTRAVES 78L05 MC68HC705C8P 2-4 MHz 1 1 2 3 3 21 1 9 4 1 1 2 5 1 1 1 PM 300 - FM Broadcasting Transmitter - USERS MANUAL 103 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 15. TROUBLESHOOTING In the following table there is a list of the most frequent malfunctions, the corresponding symptoms and their possible solutions for the PM300 transmitter. CAUSE SYMPTOM AC main absent

-PWR led OFF when transmitter switched ON VSWR or TEMPERATURE protection intervention or defective lock of the PLL circuit on modulator.

- No output power

-VSWR led ON or TEMP led ON or LOCK led OFF. ACTION SUGGESTED Check the presence of the connection to the electric line and the integrity of the power cord. Check the fuse (N1 Fig. 1.2). If the fuse is burnt check that the voltage of the electric line is the same (115 or 230Vac) as the one selected by the rear panel switch (N 2 Fig. 1.2) and then replace the fuse. If on the front panel the VSWR led is light on, check the integrity of the output load

(antenna or dummy load) and the corresponding cables, then, perform a RESET using the push-button (N 12 Fig. 1.2). If the led TEMP on the front panel is light on, control the room temperature (should be <

45C). If under 45C, 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 - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. contact DBs Technical Service. If on the front panel the LOCK led is light off, control the DC voltage that is on the audio and SCA inputs (the DC voltage should be lower than 1 V otherwise there could be PLL locking problems):

if it is correct, please open the transmitter cover and the modulator box cover (N 8 Fig. 1.3 and check the supply voltages 12Vdc presence on the modulator board. If the voltages are not correct, please check the internal connectors and the relative cables. If the problem persists contact DB Elettronica. Adjust the output power level using the front panel trimmer

(Fig. 1.1).

- Adjust input audio levels and front panel potentiometer (Fig. 1.1) following indications in Chapter 5. Output power adjustment not correct

- Very low output power Excessive or low deviation

- Received audio: very low or badly distorted PM 300 - FM Broadcasting Transmitter - USERS MANUAL 105 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 16. APPENDIX A 16.1 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 1 2 3 ground

ground not connected signal 106 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL DB ELETTRONICA TELECOMUNICAZIONI S.p.A. 17. APPENDIX B 17.1 MOSFET REPLACEMENT 1. Disconnect the supply voltage from the output board (faston connection). 2. Unscrew the damaged MOSFET and the output matching board. 3. Unsolder the MOSFET. 4. Clean the input and output boards to prevent short-circuits before replacing the MOSFET. 5. Locate properly the white teflon sheets between the output circuit and the heat sink: affix the circuit using the two screws. 6. Put on the thermically conductive compound between the MOSFET case and the heat sink. 7. Fix the MOSFET to the heat sink (screws must be strongly fixed) and solder all the four pins of the MOSFET: careful attention must be paid to the output board soldering since an excessive quantity of tin can cause a short circuit between different board layers. Reconnect also the 2 GND interconnections, indicated on Fig. 17.1, and check the right soldering of the input transformer and gate resistor. 8. Verify that the supply voltage is 45V (if it is not, there is a problem in the switching power supply boards). Reconnect the supply voltage to the 300W module (faston connection), placing an ammeter in series (minimum full scale deflection 10A). 9. Control the output power level (it should be 300W) and the absence of spurious emissions (to check it, use a spectrum analyzer and an output RF monitor sufficiently attenuated). Pay attention to the ammeter: the MOSFET must not drain more than 9A. 10. In case the replaced MOSFET doesnt reach the nominal output power or in case of spurious emissions you need to improve the input matching of the 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 - USERS MANUAL 107 /108 DB ELETTRONICA TELECOMUNICAZIONI S.p.A. Fig. 17.1 - MOSFET REPLACEMENT 108 /108 PM 300 - FM Broadcasting Transmitter - USERS MANUAL