Sofratec EB2000 Manuale utente

PAGE 1

SOFRATEC BROADCAST EQUIPMENT

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EB 2000 USER AND MAINTENANCE MANUAL

Rev. 2.0 - 06/03

EB2000

87.5 ÷ 108 MHz FM 2000W TRANSMITTER

USER AND MAINTENANCE MANUAL

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SOFRATEC BROADCAST EQUIPMENT

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EB 2000 USER AND MAINTENANCE MANUAL

CONTENTS

1INTRODUCTION....................................................................................................3

2GENERAL DESCRIPTION ...................................................................................4

3TECHNICAL FEATURES .....................................................................................5

4TECHNICAL SPECIFICATIONS..........................................................................8

5INSTALLATION AND USE....................................................................................9

5.1 FOREWORD TO INSTALLATION ............................................................9

5.2 PLACING THE APPARATUS ....................................................................10

5.3 WIRING INTO THE MAINS..................................................................... 11

5.4 SYSTEM CONNECTION ...........................................................................12

5.5 LF CONNECTION AND PRESETS ..........................................................13

5.6 OPERATION................................................................................................ 18

6COMMANDS AND PROGRAMMING..............................................................21

6.1 PASSWORD ORGANISATION................................................................. 21

6.2 FACTORY DEFAULT PASSWORDS........................................................22

6.3 MENU AND COMMANDS DESCRIPTION ...........................................23

7SERVICE AND MAINTENANCE .......................................................................33

8GUARANTEE......................................................................................................... 34

9SERVICE MANUAL..............................................................................................35

9.1 INTERNAL DESCRIPTION ......................................................................35

DRAWINGS

EB2000, top & front assembly view

EB2000, rear internal view

EB2000, general electric diagram (E1024)

EB2000, exciter assembly electric diagram (E0909)

SEXC25AL5, auxiliary power regulator board (E0805A)

EXC25CON, cpu controller and display board (E0838)

EXC1K05IN, input & interface board (E0911)

EXC25MB, lf and rf control mainboard (E0837)

SEXC23COD2, stereo encoder board (E0868)

SEXC25MOD, FM exciter board (E0839)

ASEXC25AM5, 25W FM driver amplifier (E0691)

ASRFB2K0RF, 2KW amplifier assembly (E1018)

SRFB2K0LP, 2KW low pass filter (E1017)

SRFB500W, 500Wamplifier module

SRFB1K5ALM, 48V/70A SMPS regulator module

EXB 2000 USER AND MAINTENANCE MANUAL

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SOFRATEC BROADCAST EQUIPMENT

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EB 2000 USER AND MAINTENANCE MANUAL

EXC 2005

87.5 ÷ 108 MHz FM 2000W TRANSMITTER

1. INTRODUCTION

TheEB2000 series transmitters are the result ofexperience gained by SOFRATEC during years of

producing FM broadcast equipment, transmitters, stl and stereo encoders.

These transmitters were specifically designed to comply with the latest international standards and

the requirements of advanced broadcasters, meeting tighter specifications than usually required, at an

affordable cost.

Greatcarewentinto besidesthe producingaHi-Fi-qualitymodulatedsignal,withlowresidualnoise

anddistortion.RFsignalisfreefromspuriousandharmoniccomponentstoahigherdegreethanrequired

by CCIR, European, USA and most other national standards.

In order to obtain this outstanding performance, SOFRATEC strongly recommend to rely on

qualified personnel to install and verify the equipment which builds up the radio station, i.e. the

transmitter, the possible stl and power amplifier, the corresponding antennas, cables and connectors.

This will assure the best performance and stability in time.

Tothis aim, we especially recommend thatour equipment should not be tamperedwith by unskilled

personnel and our after-sale service is available to customers for any technical problem. Before

proceeding to the installation, please carefully read at least the general installation part of this manual,

to gain confidence with the equipment.

Thetransmitters areverystable andchangesto theinternalpre-setting otherthanfrequency andfew

other options are not usually required but, if they are, once again we repeat that they must be carried

outbyskilledpersonnel,withtheproperinstrumentsandservicedocumentation.Improperlytampering

with the settings may harm the apparatus or jeopardize the guaranteed performance.

THIS EQUIPMENT COMPLIES WITH ALL RELEVANT EMI/EMC AND SAFETY

REQUIREMENTS, ETSI EN300384, ETS300447 AND EN60215 STANDARDS.

NO INTERNAL ADJUSTMENT OR PRESETTING IS REQUIRED DURING NORMAL

OPERATIONS. THEAPPARATUS SHALLBEPROPERLYEARTHEDANDBEOPERATED

WITH ALL THE COVERS CLOSED TO PREVENT ELECTRICAL HAZARDS AND

COMPLY WITH EMC STANDARDS.

——— MAINS VOLTAGE MAY KILL ———

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EB 2000 USER AND MAINTENANCE MANUAL

2. GENERAL DESCRIPTION

The EB2000 is a 2000W rated, direct-synthesis, FM-modulated transmitter. Being digitally

controlled,itisextensivelyonfieldprogrammablebyfrontpanelorremotelyineveryrespect:frequency,

power, channel sensitivity, preemphasis, functioning mode (mono, stereo, external mpx), clock and

dateandmanyotherparameterswithoutadjustingorreplacing anypart. Apowerful3-levelspassword

managementpermitsaveryhighdegreeofsecurityandprivacyasmayberequiredindifferentsituations.

The apparatus requires little or no maintenance and its simple modular layout allows easy stage testing

and servicing.

As required by various national standards, these transmitters incorporate sophisticated low-pass

audio filters on mono and stereo channels, and a sharp acting modulation limiter, which is usually set

atapeakdeviationslightlyhigherthan75kHz. Itsinterventionmayneverthelessbeavoided,ifrequired,

by pre-setting its threshold at a deviation higher than 150 kHz.

Output frequency is phase-locked to a temperature-compensated crystal oscillator, which ensures

superior precision and stability. A very low noise, low distortion VCO produces a harmonic-free,

spurious-free signal. A lock control circuit inhibits the presence of power on the output until the

apparatus is on the right frequency, when it is turned on.

Tolowerthenoisethresholdfurther,thelow-frequencyinputsarefittedwithbalancedinputcircuitry.

The input level is precisely adjustable over a broad range, by means of a 0.5dB stepwise variable

attenuators. The transmitter has an auxiliary input, specifically designed for RDS and SCA encoders.

A modulation output permits to control other transmitters or STL's with the same internally processed

high-quality mpx signal.

Thealphanumericdisplaypermitseasyandaccuratemetering,adjustmentandcontinuousmonitoring

ofmodulationlevels,power,operationandinternalparameters.Suchdetailsmaybeexternallyavailable

on the same RS232 I/O port that may be used to remotely control the transmitter. In addition to the

serialI/O,somesignals(RFpower,Ontheairstate,Disableline)areavailableonaparallelI/Osocket

for easy interfacing with others analog controllers or supervisory systems.

Atop-qualitystereoencodermaybefactoryinstalledasoptionandevenretrofittedlaterinthefield,

requiring minimum technical skill. The powerful internal software and monitoring functions recognise

its presence and enable its functions.

The RF power amplifier employs a broadband design and has plenty of reserve: the output power

isfeedackcontrolledforincreasedstabilitytoahigherlevelthanthenominal one.High reflectedpower

is limited to prevent output stage degradation; direct power is accordingly continuously reduced so as

not to exceed the reflected power safety level. A sturdy telecom-grade high efficiency switch-mode

power supply permits operation in a very wide and noisy mains environment.

The temperature alarm circuitry reduce the output power in case of high room or esternal

temperature, trying to stay on the air in spite of the adverse conditions.

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EB 2000 USER AND MAINTENANCE MANUAL

3. TECHNICAL FEATURES

3.1 FRONT PANEL COMMANDS AND SIGNALLING

The EB2000front paneliscleanandeasytocontrol.Thewidealphanumericdisplayandthecontrol

keyboard permit a simple self-explanatory menu-driven navigation through the various options.

Great care was taken in the design of the software to allow a natural approach to the controls and

allow operationandprogrammingineveryrespectoftheapparatuswithoutneedingtoextensivelyread

the user's manual.

The password management, hides some functions and prevents tampering with the most critical

options and data to unauthorised people.

Theon/stand-bykeydoes notpowerofftheapparatus,whichisstilllockedonfrequencyandready

to transmit as soon as the key is pushed or a remote command is sent.

Some leds signal at a glance proper functioning and warning states.

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EB 2000 USER AND MAINTENANCE MANUAL

INCASEOFDUCTINGOFTHEVENTILATIONAIR,

AN EXTERNAL EXTRACTING FAN IS REQUIRED.

LEFT

AUDIO INPUT

RIGHT REMOTE

2 Signal -

1 Ground

3 Signal +

20k-100k

MODULATION

MONITOR RS232AUX MPX

10-100000 Hz

RFOUTPUT

50 OHM

MADEINITALY

0678

ABSOLUTELY REMOVE POWER CORD FROM MAINS

GROUND

UPPER AND BOTTOM COVERS ARE REQUIRED TO

ELECTRICAL SHOCKS, DO NOT REMOVE ANY PANEL.

MEET BOTH SAFETY AND EMI REQUIREMENTS.

CIRCUITSATTHEREAROFTHISPANELARE

CONNECTED TO MAINS VOLTAGE. TO PREVENT

CAUTION!

POWER

I PANNELLI DI CHIUSURA SUPERIORE ED INFERIORE

PRIMA DI CAMBIARE I FUSIBILI INTERNI, DISCONNETTERE

SONO RICHIESTI PER LA CONFORMITA' AGLI STANDARD

DISICUREZZAE DI EMISSIONE ELETTROMAGNETICA.

ASSOLUTAMENTE IL COLLEGAMENTO ALLA RETE

NON RIMUOVERE LE COPERTURE. INOLTRE ENTRAMBI

RETE. PER EVITARE RISCHI DA SCOSSA ELETTRICA

SULRETRODIQUESTOPANNELLO SONO DIRET-

TAMENTEACCESSIBILICIRCUITI A TENSIONE DI

BEFOREREPLACING INTERNALFUSES.

ATTENZIONE!

E' RICHIESTO UN GRUPPO DI ASPIRAZIONE ESTERNO.

IN CASO DI CONVOGLIAMENTO DELL'ARIA DI VENTILAZIONE

4500VA (RFB2001)

230Vac 50/60Hz

2500VA (RFB1001)

OFF

0678

SISTEMI

ELETTRONICI

INCASEOFDUCTINGOFTHEVENTILATIONAIR,

AN EXTERNAL EXTRACTING FAN IS REQUIRED.

LEFT

AUDIO INPUT

RIGHT REMOTE

2 Signal -

1 Ground

3 Signal +

20k-100k

MODULATION

MONITOR RS232AUX MPX

10-100000 Hz

RFOUTPUT

50 OHM

MADEINITALY

0678

ABSOLUTELY REMOVE POWER CORD FROM MAINS

GROUND

UPPER AND BOTTOM COVERS ARE REQUIRED TO

ELECTRICAL SHOCKS, DO NOT REMOVE ANY PANEL.

MEET BOTH SAFETY AND EMI REQUIREMENTS.

CIRCUITSATTHEREAROFTHISPANELARE

CONNECTED TO MAINS VOLTAGE. TO PREVENT

CAUTION!

POWER

I PANNELLI DI CHIUSURA SUPERIORE ED INFERIORE

PRIMA DI CAMBIARE I FUSIBILI INTERNI, DISCONNETTERE

SONO RICHIESTI PER LA CONFORMITA' AGLI STANDARD

DISICUREZZAE DI EMISSIONE ELETTROMAGNETICA.

ASSOLUTAMENTE IL COLLEGAMENTO ALLA RETE

NON RIMUOVERE LE COPERTURE. INOLTRE ENTRAMBI

RETE. PER EVITARE RISCHI DA SCOSSA ELETTRICA

SULRETRODIQUESTOPANNELLO SONO DIRET-

TAMENTEACCESSIBILICIRCUITI A TENSIONE DI

BEFOREREPLACING INTERNALFUSES.

ATTENZIONE!

E' RICHIESTO UN GRUPPO DI ASPIRAZIONE ESTERNO.

IN CASO DI CONVOGLIAMENTO DELL'ARIA DI VENTILAZIONE

4500VA (RFB2001)

230Vac 50/60Hz

2500VA (RFB1001)

OFF

0678

SISTEMI

ELETTRONICI

3.2 REAR PANEL CONNECTORS

All transmitter inputs and outputs are allocated on the rear panel. They are:

-The audio channels input sockets on balanced female XLR-type connectors

-The wide-band external processed / stereo or composite signal input on a grounded

unbalanced BNC connector

-The frequency limited (20k

100kHz) auxiliary channel input on a grounded,

unbalanced BNC connector

-The LF modulation output for monitoring, RDS external synchronisation or re-

broadcasting purpose, BNC-type

-The inverted wired RS232 DB9 female remote serial control port

-The remotr parallel control port, DB9 male type

-The RF antenna connector, N-type

-The hot centre-pin on the "EXTERNAL" BNC input is physically in parallel with the

signal + input (pin 3) on the mono/right channel XLR socket. For this reason both

connectors cannot be used at the same time.

On the left side of the panel it is located the mains power switch, the power cord and

anearthscrewforsystemearthinginadditiontothegroundconductoronthecord.The

power switch trips if an overcurrent condition should occur.

Please note that the transmitter is usually factory pre-set for 220-240 Vac

nominalmainsvoltage. Ifrequested,110-120 Vacrangemust beinternallyset

on the mains tranformer board.

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EB 2000 USER AND MAINTENANCE MANUAL

Note that:

- The hot centre pin of the "EXTERNAL" BNC input (MPX or stereo inout) is physically parallel to

the "+ input" signal (pin 3) on the mono/right channel XLR socket. For this reason, you cannot use

both connectors at the same time.

On the left side of the panel are located the mains power switch, the power cord and an earth screw

for a separated earthing system as well as the ground conductor on the cord. Should an over-

current condition take place, the power switch would trip and stop the device.

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EB 2000 USER AND MAINTENANCE MANUAL

4. TECHNICAL SPECIFICATIONS

-Frequency range: 87.5 ÷ 108 MHz

-Modulation: FM, 75 kHz peak deviation:

180k F3E mono

256kF3E stereo

-Passo di sintesi:10/100 kHz

-Frequency error: <200 Hz

-Frequency drift:

<250 Hz in operating temperature

<100Hz/year

-RF output power: 300 ÷ 2000W ± 0,5 dB

-Max reflected power: 160W

-Harmonic products RF: <-67 dB, -72dB

-Spurious products RF: <-85 dB (- 95 dB)

-RF output power impedance: 50 ohm

-RF output power connector: 7/16”

-Audio/Mpx input level: -3.5 ÷ +12.5dBm

@ ± 75kHz deviation

-Audio/Mpx input impedance:

10k ohm/600 ohm, balanced./unsbalanced

-Common mode input:

>50 dB, >60dB tip. (20÷15000 Hz)

-Audio input connectors: XLR female

-Auxiliary/Mpx input level:

-12.5 ÷ +3.5dBm @±7.5 kHz dev.

-24 ÷ -8dBm @±2 kHz dev.

-Aux channel input impedance: 10k ohm

-Mpx and aux input connectors: BNC

-Mpx output level:

0 ÷ +10 dBm @ ±75kHz dev.

-Preenphasis time costant: 0/50/75 µs ±2%

-S/N ratio, mono:

>70 dB, 73 tip. (30÷20000Hz)

-S/N ratio, stereo:

>66 dB, 68 tip. (30÷20000Hz)

-Modular distortion:

<0.05% 0.02% tip. @ 75kHz dev.

<0.2% 0.05% tip. @ 150kHz dev.

( limiter threshold>150 kHz)

-Stereo crosstalk:

>50 dB with ext. encoder

>60 dB (100÷5000 Hz)

>50 dB (30÷15000 Hz)

with int. encoder

-Audio channels frequency response:

30 Hz ÷ 15 kHz ±0.1dB

-Attenuazione fuori banda audio:

>50 dB @ F≥19 kHz

-Deviation limiter: adjustable betw. 0 > +7 dB

-Mpx input frequency response:

10 Hz÷100kHz ±0.1dB

-Aux input frequency response:

10÷ 100 kHz ±0.2dB

-I/O liner: Disable RF, Forward power

On-the-Air, Allarm.

RS232 for monitoring control

-Mains supply requirements:

230 Vca ±15% 50/60 Hz

4800 VA/3600W @ 2000 W output

-Operating temperature range:

0÷35° C recomm.

-10÷45 °C max.

-Dimensions without handless:

483 x 310 x 570 mm

rack std. 19” 7 u

- Weight: ca. 47 Kg

SYSTEM AND PROTECTION CONTROLS

-Block against emission on spurious frequencies

-Reflected power and over temperature

-Modulation limiter

>75 dB, 78 tip. (CCIR)

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EB 2000 USER AND MAINTENANCE MANUAL

5. INSTALLATION AND USE

5.1 FOREWORD TO INSTALLATION

Although in most cases no special instruments are required, have skilled personnel install the

apparatus.Tomakebestuseoftheapparatus’scapabilitiesandpreventdamagetotheunit,complywith

the recommendations throughout this manual.

When in doubt, or if any technical problems should arise during the installation procedure,

SOFRATECstronglyrecommendtheapparatusnotbetamperedwithinanywaybyunskilledpersonnel

and will be glad to supply qualified after-sale service.

TheEB2000 hasmanyfeaturesofahi-fiapparatusandshouldbeinstalledandaudio-wiredwith the

same care, avoiding earth loops as much as possible. When these conditions are met, the transmitter

performs superbly.

As a rule, the user should not have access to the inside of the apparatus for normal installation and

use. Tampering with the factory settings makes the guarantee null and void and might also affect

apparatus’ performance, causing costly damage.

Beforeproceedingfurther,makesurethatmainsvoltagecorrespondstothefactory-setvalue(usually

220/240 Vac). In case it differs, jumpers must be internally set on the mains supply termination board

of the apparatus as described further on the manual. This must be done by skilled technicians.

NO ADJUSTMENT OR INTERNAL PRESETTING IS REQUIRED FOR NORMAL

OPERATIONS. THEAPPARATUS SHALL BE PROPERLYEARTHEDANDBEOPERATED

WITH ALL THE COVERS CLOSED TO PREVENT ELECTRICAL HAZARDS IN

OPERATION AND FULLY COMPLY WITH CE EMI AND SAFETY REQUIREMENTS.

NEVER TOUCH THE INSIDE OF THE APPARATUS WITHOUT FIRST DISCONNECTING

IT FROM THE MAINS. DANGEROUS AC, DC AND RADIO-FREQUENCY VOLTAGES

ARE PRESENT INSIDE AND BECOME ACCESSIBLE WHEN THE COVERS ARE RE-

MOVED.

——— MAINS VOLTAGE MAY KILL ———

WARNING !

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EB 2000 USER AND MAINTENANCE MANUAL

5.2 PLACING THE APPARATUS

Install apparatus in a dry, sheltered but well-ventilated room away from dust, moisture,

insects and vermin (mice). Place apparatus as close as possible to the antenna to prevent

excessive power loss in the cables. If this is not feasible, use antenna cables of suitable cross-

section.

Room size shall be such that the apparatus can be placed in an upright position and that

technical personnel can easily carry out routine or extraordinary maintenance. The minimum

recommendedsizeis2.5mx2m,and2.2mhighwhenthereisnootherbroadcastingorsupport

equipment nearby.

For the best results the operating temperature must be comprised in the +10 ÷ +35 °C

range. Higher temperatures up to +45 °C, while allowed in the specifications, are not

recommended as they will reduce the life of the apparatus.

This conditions cannot generally be met when the exhaust cooling air is not ducted outside

and is fed back into the room. This is even truer if more than one apparatus is installed in the

same location. An efficient ventilation system is thus required in the room. Air exchange in the

room shall have a minimum flow-rate of 500 metres cubed per hour or more.

If the apparatus is fitted in a rack system, the back door of the rack cannot usually be fixed

in place. If a completely closed assembly is needed, a suitable ventilation extraction unit must

equip the system. To aid air ducting, an optional flange may be retrofitted on the ventilation

outlettowhich a duct can be attached to convey hot air outside.Inthiscaserememberthatthe

EB2000 internalfansarelow-pressureunits:somesortofexternalairextractionbloweristhan

imperative on the exhaust air duct.

Ventsinthewalls andanyother openingsshallbefittedwith ametalgratingtokeep rodents

out, and with a dust filter. Make absolutely certain that no water can seep through the vents

or the air exhaust duct or antenna-cable grommet, and that the floor cannot be flooded during

heavyrainfall.Ifnotimpeditedbyproperairfiltering,insectsinsomelocationmaybeconveyed

in the internal heatsink, accumulating on it and finally obstructing it, causing overtemperature

alarm.

Even moisture and/or dust, when contained in the air or in the room in excessive quantity,

maycausecondensationbuild-upintheamplifier.When thesystem isperiodicallyswitchedon

and off, this can trigger destructive electric arcs and short circuits and thus cause damage that

is not covered by the guarantee.

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