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Sofratec EXB300 User And Maintenance Manual

87.5-108 mhz fm 300w transmitter
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EXB300
87.5 ÷ 108 MHz FM 300W TRANSMITTER
USER AND MAINTENANCE MANUAL
SOFRATEC BROADCAST EQUIPMENT
WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71
Rev. 1.1 - 02/02

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  • Page 1 EXB300 87.5 ÷ 108 MHz FM 300W TRANSMITTER USER AND MAINTENANCE MANUAL SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 Rev. 1.1 - 02/02...

  • Page 2: Table Of Contents

    ASEXC101AMP FM 100W power amplifier (E0514A) SEXC23COD2 stereo encoder board (E0868) ASEXB300AL power supply regulator assembly (E0913) SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 2...

  • Page 3: Introduction

    COVERS CLOSED TO PREVENT ELECTRICAL HAZARDS AND COMPLY WITH EMC STANDARDS. ——— MAINS VOLTAGE MAY KILL ——— SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 3...

  • Page 4: General Description

    The temperature alarm circuitry reduce the output power in case of high internal or ambient temperature, trying to continue to stay on the air in spite of the adverse conditions. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 4...

  • Page 5: Technical Features

    Some leds signal at a glance proper functioning and warning states. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 5...
  • Page 6 Please note that the transmitter is usually factory pre-set for 220-240 Vac nominal mains voltage. If requested, 110-120 Vac range must be internally set on the mains tranformer. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 6...

  • Page 7: Technical Specifications

    Reflected power Modulation limiter High internal or external temperature Real-time clock and date, with battery back-up SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 7...

  • Page 8: Installation And Use

    In some applications, where the power is over-dimensioned or the cable length is small, RG213 cable will do. RG58 is adequate only for connection to a subsequent amplifier, little apart. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 8...
  • Page 9 In case the passwords are disabled as factory preset, repeatedly press "ESCAPE" key to access to keyboard functions SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 9...

  • Page 10: Lf Connection And Presets

    10k ohm. They can be connected to the balanced output of a professional mixer or to the unbalanced one of a cheaper unit without appreciable degradation. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 10...
  • Page 11 5 kohm in this case too. LF, RF & control input / output connector ports SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 11...
  • Page 12 For this reason SOFRATEC recommend, whenever possible, to adopt +6 ÷ +11.5 dBm as nominal peak level for audio modulation purpose. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 12...
  • Page 13 For this reason, the limiter’s cut-in threshold should never be too high. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 13...
  • Page 14 - Pin 7, Alarm: logic low signal means alarm. Correct functioning is signalled by +12V/10kΩ. Maximum current sinking capability <10mA. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 14...

  • Page 15: Operation

    They will be internally 15-kHz SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 15...
  • Page 16 SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 16...
  • Page 17 CONNECTION MAY CAUSE DEGRADATION AND POSSIBLE DESTRUCTION OF THE FINAL STAGE. THIS FAILURE IS NOT COVERED BY THE GUARANTEE. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 17...

  • Page 18: Commands And Programming

    This password must be immediately changed at the first pre-set of the apparatus: if any SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 18...

  • Page 19: Factory Default Passwords

    The "enter" key changes from scrolling to programming mode, if allowed in the field. Another push SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 19...
  • Page 20 23:00-06:00 P=50% ELAPSED TIME SET PASSWORD CONF. PASSWORD LEV.1 **** EXEC SW RESET? YES/NO Hierarchical menu tree SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 20...
  • Page 21 20 characters long message e.g. the following organisation name: NORTH-WEST RADIO X25 SW rev. 1.0 SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 21...
  • Page 22 (aliasing). In this case the MPX level reading will anyway produce correct overall modulation measure. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 22...
  • Page 23 This field contemporary summarise the actual modulation in dB due auxiliary, left, right and multiplex signal as seen in their own menu fields. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 23...
  • Page 24 It is always 7 - 12 °C higher than the external temperature at full output power: i.e. nearly +55 °C assuming an external temperature of +45 °C (the maximum allowed). SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 24...
  • Page 25 If the code or the status is changed, it is always required to confirm the correct password for that level. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 25...
  • Page 26 A local time-out will automatically escape the input if not confirmed in 30s from the last change. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 26...
  • Page 27 Allowed range is -12 ÷ +4 dBm to produce 10% modulation, i.e. 7.5kHz deviation or 0dB in the upper line of the display. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 27...
  • Page 28 Auto Control on the lower line is not operative and could be absent in other software releases. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 28...
  • Page 29 The scaled power is approximate and must be tested and/or adjusted before final setup, if critical. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 29...

  • Page 30: Service And Maintenance

    The goods shall be delivered carriage prepaid to the laboratory and shall be returned freight forward. This guarantee does not cover any consequential damage due to non-operation or faulty operation. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 30...

  • Page 31: Service Manual

    IN SMT ARE NOT INTENDED TO BE REPAIRED IN CASE OF FAILURE AND MUST BE REPLACED WITH NEW ONES. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 31...
  • Page 32 Beginning from the upper left side, we find IC8, which makes a 3-channel digitally controlled attenuator. It separately manages left, right and auxiliary channel, while the external multiplex signal is SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 32...
  • Page 33 IC5a. A separate 1Vpp output is provided on J2 to drive carrier synchronisation on a possible external RDS generator. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 33...
  • Page 34 A directional coupler on the output generates a dc signal, which is proportional to the direct and reflected RF power. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 34...
  • Page 35 No other regulation is provided on the board. The precision of the measurements is guaranteed by design by the precision of the components and the reference voltage source IC1. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 35...
  • Page 36 IC3b / TR2 / TR3 and the dc ventilation fan, by IC3c and TR4. SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 36...
  • Page 37 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 EXB300 TRANSMITTER - TOP, FRONT & REAR ASSEMBLY VIEW SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 37...
  • Page 38 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 EXB300 TRANSMITTER - ELECTRICAL DIAGRAM SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 38...
  • Page 39 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SEXC25CON - CPU CONTROLLER & DISPLAY BOARD ELECTRICAL DIAGRAM SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 39...
  • Page 40 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SEXC25CON - CPU CONTROLLER & DISPLAY BOARD COMPONENTS LAYOUT SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 40...
  • Page 41 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SEXC25MB - MAINBOARD / I/O & RF CONTROL SECTION ELECTRICAL DIAGRAM - 1 of 2 SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 41...
  • Page 42 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SEXC25MB - MAINBOARD / LF PROCESS SECTION ELECTRICAL DIAGRAM - 2 of 2 SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 42...
  • Page 43 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SEXC25MB - MAINBOARD COMPONENT LAYOUT SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 43...
  • Page 44 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SEXC25MOD - FM EXCITER BOARD - ELECTRICAL DIAGRAM SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 44...
  • Page 45 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SEXC25MOD - FM EXCITER BOARD - COMPONENT LAYOUT SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 45...
  • Page 46 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 ASEXC101AMP - FM 50W POWER AMPLIFIER ELECTRICAL DIAGRAM SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 46...
  • Page 47 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 ASEXC101AMP - FM 100W POWER AMPLIFIER COMPONENT LAYOUT SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 47...
  • Page 48 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SEXC23COD2 - STEREO ENCODER BOARD - ELECTRICAL DIAGRAM SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 48...
  • Page 49 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SEXC23COD2 - STEREO ENCODER BOARD COMPONENT LAYOUT SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 49...
  • Page 50 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 ASEXB300AL - POWER SUPPLY REGULATOR - ELECTRICAL DIAGRAM SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 50...
  • Page 51 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 ASEXB300AL - POWER SUPPLY REGULATOR - COMPONENTS LAYOUT SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 51...
  • Page 52 EXB300 - USER AND MAINTENANCE MANUAL - rev.1.1 - 02/02 SOFRATEC BROADCAST EQUIPMENT WWW.sofratec.com - e-mail : info@sofratec.com Tel: +33 4 93 01 99 99 Fax: +33 4 93 01 99 71 PAGE 52...

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