dB PM 1000 User manual
DBELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL 1 /101
PM 1000
1 kW FM Broadcasting Transmitter
User’s Manual
Release 1.0.1
- DB ELETTRONICA TELECOMUNICAZIONI S.p.A. -
- Riviera Maestri del Lavoro 20/1 - 35127 Z.I. SUD PADOVA ITALY -- Ph. (049) 870-0588 - Fax. (049) 870-0747 -
- http://www.dbbroadcast.com -
DBELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL 2 /101
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 COVERS
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.
DBELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL 3 /101
INDEX
1. PM1000 FM TRANSMITTER................................................................................................................................4
1.1 GENERAL DESCRIPTION ............................................................................................................................... 4
2. TECHNICAL SPECIFICATIONS .......................................................................................................................11
3. INSTALLATION....................................................................................................................................................13
3.1 FREQUENCY CHANGE................................................................................................................................. 14
3.2 ADJUSTMENTS AND MEASURES............................................................................................................... 16
3.3 EXTERNAL CONTROL AND MEASURES .................................................................................................. 17
3.3.1 SYSTEM CHECK SECTION.....................................................................................................................17
3.3.2 MEASURES / CONTROLS SECTION ......................................................................................................18
3.4 GENERAL BLOCK DIAGRAM DESCRIPTION ........................................................................................... 20
4. AMPLIFIER SECTION.........................................................................................................................................21
4.1 GENERAL DESCRIPTION ............................................................................................................................. 21
4.2 30 WPREAMPLIFIER/DRIVER STAGE ....................................................................................................... 21
4.3 AMP30 PRE AMPLIFIER PARTS LIST ......................................................................................................... 24
4.4 AMP300 300 WMODULE AMPLIFIER......................................................................................................... 25
4.5 AMP300 AMPLIFIER PARTS LIST................................................................................................................ 28
5. POWER SUPPLY STAGE....................................................................................................................................32
5.1 GENERAL DESCRIPTION ............................................................................................................................. 32
5.2 POWER SUPPLY BOARD 04011-001 PARTS LIST...................................................................................... 36
5.3 RS-75-24 SWITCHING POWER SUPPLY ..................................................................................................... 39
5.4 0601-008 POWER SUPPLY BOARD .............................................................................................................. 42
5.5 POWER SUPPLY PART LIST......................................................................................................................... 44
6. MODULATOR STAGE.........................................................................................................................................45
6.1 GENERAL DESCRIPTION ............................................................................................................................. 45
6.2 SINTEL ‘96 MODULATOR BOARD.............................................................................................................. 46
6.3 MODULATOR BOARD PARTS LIST............................................................................................................ 53
7. PROTECTION BOARD........................................................................................................................................56
7.1 PROTECTION BOARD N°1 PART LIST ....................................................................................................... 62
7.2 PROTECTION BOARD N°2 PART LIST ....................................................................................................... 70
8. METER STAGE.....................................................................................................................................................71
8.1 GENERAL DESCRIPTION ............................................................................................................................. 71
8.2 METER BOARDS PARTS LIST ..................................................................................................................... 76
9. IN-AUDIO BOARD................................................................................................................................................78
9.1 IN-AUDIO BOARD PARTS LIST................................................................................................................... 80
9.2 IN-AUDIO BOARD JUMPERS SETTING...................................................................................................... 81
10. TRANSMITTER OPTIONS..............................................................................................................................82
10.1 EXTERNAL FREQUENCY CONTROL (/C OPTION)..................................................................................... 82
10.2 EXTERNAL FREQUENCY CONTROL PARTS LIST................................................................................... 84
11. STEREO ENCODER BOARD (/S OPTION)..................................................................................................85
11.1 CHANNELS PRE- EMPHASIS SETTING...................................................................................................... 85
11.2 STEREO ENCODER PARTS LIST ................................................................................................................. 96
12. APPENDIX..........................................................................................................................................................99
12.1 APPENDIX A-XLR AUDIO CONNECTORS PINOUTS.............................................................................. 99
12.2 APPENDIX B-MOSFET REPLACEMENT................................................................................................. 100
DBELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL 4 /101
1. PM1000 FM TRANSMITTER
1.1 GENERAL DESCRIPTION
The PM1000 is a complete FM broadcasting transmitter with continuously adjustable output power,
0 to 1050W. Made with MOSFET technology, can be used as stand-alone complete transmitter or
as driver for high power amplifiers.
On the PM1000 the use of MOSFET allows:
- Higher efficiency ( ≈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 external selectors (/C option). The minimum frequency step is 10 kHz.
The transmitter has high frequency stability, due to the use of the Digital Phase Locked Loop
system and a very low drift reference quartz.
DBELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL 5 /101
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 in the modulation board to enable the limiter.
Valuable characteristics of PM1000 include intelligent protections. Circuits to protec from load
mismatching (VSWR) and overtemperature (TEMP) allow to otain a very high reliability in all
conditions. Every alarm condition is monitored by means of front panel leds.
The front panel led bar enable the full, easy and fast verification of 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 audio level, 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 10th order elliptic 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.
DBELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL 7 /101
Fig. 1.1 - PM1000 TRANSMITTER FRONT VIEW
1) Overtemperature protection indicator 7) Contraves (option /C) 13) Mono/Stereo mode selector 19) L/R channel level measure indicator
2) Indicator of unbalancing between modules 8) RF monitor BNC connector 14) Forward power measure indicator 20) Measure selector
3) Power limiter indicator 9) Output power trimmer adj. 15) Reflected power measure indicator 21) Measure instrument
4) VSWR protection indicator 10) Deviation trimmer adj. 16) Vpa voltage measure indicator
5) Remote shut-down indicator 11) Lock frequency indicator 17) Ipa current measure indicator
6) Indicator of the on/off transmitter state 12) Manual/Remote selector 18) Frequency deviation measure indicator
DBELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL 8 /101
Fig. 1.2 – PM1000 TRANSMITTER REAR VIEW
1) RF output DIN 7/16” connector 7) SCA2 input BNC connector 13) MPX input level adj. 19) Sync. input BNC connector
2) Mains power supply connector 8) SCA2 level adj. 14) MPX input BNC connector 20) Interlock BNC connector
3) Mains On/Off switch 9) Left channel (or mono) input level adj. 15) SCA1 level adj.
4) Remote control DB25 connector 10) Left channel (or mono) input XLR connector. 16) SCA1 input BNC connector
5) SCA3 input BNC connector 11) Right channel input level adj. 17) MPX Out BNC connector
6) SCA3 level adj. 12) Right channel input XLR connector 18) AUX input BNC connector
DBELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL 9 /101
Fig. 1.3 – PM1000 TRANSMITTER TOP VIEW
1) Blower 6) Remote control board
2) Output filter 7) Protection board (controls)
3) Output coupler 8) Protection board (panel)
4) AMP300, 300 W amplifier boards
5) Switching power supply board
DBELETTRONICA TELECOMUNICAZIONI S.p.A.
PM 1000 – 1 kW FM Broadcasting Transmitter - USER’S MANUAL 10 /101
Fig. 1.4 – PM1000 TRANSMITTER BOTTOM VIEW
1) Sintel ’96 modulator board 5) Power supply board 0601-008
2) Coder stereo board 6) Measure boards
3) Contraves board (/C option) 7) AMP30, 30 W pre-amplifier board
4) Power supply board RS 75-24
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