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Table of Contents
Related Manuals for SBS FM30
Summary of Contents for SBS FM30
- Page 1 FM30 FM EXCITER/TRANSMITTER & Transposer Installation, Operator and Service Manual Eddystone Broadcast Limited, Broadcast House, Lauriston Park, Pitchill, Evesham. WR11 8SN Telephone (+44) 1386 871650 Fax (+44) 1386 871987 Email sales@eddystone-broadcast.com www.eddystone-broadcast.com...
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Page 2: Table Of Contents
Eddystone Broadcast Ltd. Eddystone Broadcast Ltd shall not be liable for any direct, indirect, consequential or incidental damages as a result of the use or misuse of this equipment, handbook or any related materials. FM30 Series Technical Manual Page 2... -
Page 3: Introduction
Introduction )))))))))))))))))))))))))))))))))) The FM30 is a top specification broadcast FM exciter that is also ideally suited as a low power stand alone transmitter. Featuring wideband design techniques, frequency adjustment is easily achieved by internally set direct reading dial switches - no further tuning is required. Both the international 87.5-108MHz and Japanese 76-90MHz frequency bands are catered for. -
Page 4: Safety, Electrical Hazard
In common with all mains operated equipment, only suitably trained competent personnel should attempt to adjust, modify or repair this equipment or operate it with the cover removed. In case of any query please contact your local agent or sbs. Any unauthorised adjustment, modification or repair of this equipment may invalidate any warranty and/or safety approvals that apply. -
Page 5: Safety, Toxic Hazard
UK your local council will have a toxic waste disposal department who will be able to advise you. Elsewhere you should contact the responsible authorities. NEVER DISPOSE OF A DEVICE CONTAINING BERYLLIUM OXIDE WITH GENERAL WASTE. FM30 Series Technical Manual Page 5... -
Page 6: Unpacking
IEC Power lead FM30 series manual If any items are missing or damaged please inform your supplier immediately. Initial Checks Ensure that the FM30 has been set to the correct power/line voltage for your country. FM30 Series Technical Manual Page 6... -
Page 7: Controls And Connectors
O/P Monitor Monitor of RF output (approx. -40dBc). This point should not be used for harmonic or power measurements Meter and selector Selects and indicates important FM30 parameters. FM30 Series Technical Manual Page 7... - Page 8 Pin 2 Reverse power alarm. Pin 3 PLL lock alarm. Pin 4 Mute RF output (link to ground). Pin 5 Receive signal alarm (FM30/RBRX) Pin 25 Ground. All outputs are open collector and low in their normal state. The output transistors are BC184L's, which can sink up to 100mA maximum with an absolute maximum switched voltage of 30V.
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Page 9: Installation
Whilst the Phase Locked Loop is Locking up the modulator output is muted (indicated by the front panel PLL LOCK LED). When the FM30 is either powered up or the frequency changed, it will normally take about 5 seconds for the PLL to lock up. - Page 10 Connect the FM30 to the mains or DC supply and wait for the PLL to LOCK (the front panel LED indicates lock when green). Using the rear panel power adjust control (PWR. ADJ.) set the power to that required. 6.3 FORWARD POWER ALARM This setting defines the point at which the front panel P.
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Page 12: Specifications
Ambient temperature range (normal conditions) 0 to 50 Celsius Ambient temperature range (extreme conditions) -20 to 60 Celsius 90% non condensing Humidity Under normal operating conditions Under extreme operating conditions Under all operating conditions FM30 Series Technical Manual Page 12... - Page 13 For all enquiries please contact your local agent, or Eddystone Broadcast Ltd directly at: Broadcast House Lauriston Park Pitchill Evesham WR11 8SN Or telephone +44(1386)871650 Or fax +44(1386)871987 Or email sales@eddystone-broadcast.com Alternatively visit our web site: http://www.eddystone-broadcast.com/ FM30 Series Technical Manual Page 13...
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Page 14: Technical Section Contents
FMTX PSU DC-DC Convertor 10.4 FM30 PA Amplifier 10.5 FMTX-DIS Power distribution and metering/control 10.6 LimX Combined Limiter/stereo encoder 10.7 RBRX Module 10.8 SCA Input board 10.9 Adjustments 10.10 Power supply flow diagram 10.11 Wiring diagrams FM30 Series Technical Manual Page 14... - Page 15 7. Each PCB performs a separate, distinct function. To fully understand the operation of the FM30 it will be necessary to know how each board is interconnected with the other sections of the unit.
- Page 16 Audio is fed into the modulation input connector CON2. From here the signal passes to variable resistor VR2 where modulation levels can be set, it is then passed via R29 to the varicap diodes. FM30 Series Technical Manual Page 16...
- Page 18 R2/R3. Alternatively R5 can be linked to ground, turning on T1. The former input is connected to the PLL Out of Lock output from the PLL7 modulator and the latter is linked to the rear panel control connector to provide the external mute facility. FM30 Series Technical Manual Page 18...
- Page 20 10.4 FM30 PA )))))))))))))))))))))))))))))))))) The FM30 30W amplifier is a 2 stage design, using Semelabs MOSFET devices. The DC input voltage to the amplifier can vary between 5-15.5V depending on the required output power. Resistors R9, R10, R11 form an input attenuator. The input matching circuit for U1 comprises L2, 2:1 transformer T2 and R8.
- Page 23 7 and 8 of connector CN2. The purpose of TR5 is to turn on TR6 as soon as the cut-back system stars to operate. TR6 drives the red part of the P REF LED and turns on TR7 which will turn off TR8. FM30 Series Technical Manual Page 23...
- Page 25 The LimX PCB combines a stereo pre-emphasis limiter, low pass filter, clipper and stereo encoder onto a single PCB. The limiter is based on the popular sbs MaXiM limiter and features a discrete JFET based limiter stage which provides improved dynamic distortion performance over conventional VCA designs.
- Page 27 FM30 Series Technical Manual Page 27...
- Page 28 The output of the module is an audio multiplex/composite signal which is passed through a filtered D-type connector with the power supply and control/monitor signals. A supplementary wiring loom is used to connect the RBRX module to the FM30. FM30 Series Technical Manual Page 28...
- Page 30 The optional SCA input boards allows up to 3 SCA inputs (such as RDS), a mono balanced input or a standard multiplex/composite audio signal to be connected to the FM30. The mono input has link selectable pre-emphasis (0, 50 and 75uS). The multiplex/composite input can be switched between balanced or unbalanced. This input and the three SCA inputs use BNC connectors which have individual link selectable 75 Ohm termination.
- Page 32 10.9 Adjustments )))))))))))))))))))))))))))))))))) LimX PCB (FM30/S Only) FET BIAS Connect an audio input at 400Hz to the LEFT and RIGHT or mono inputs that is below the limit threshold, for example -20dBu. LimX: Turn R40 and R31fully anti clockwise. Connect an oscilloscope or level meter to U7 pin 7.
- Page 33 Turn R19 fully anti clockwise. Connect an oscilloscope to the MPX OUTPUT connector. Turn R19 clockwise and observe that the peak level shown on the oscilloscope increases. Stop adjusting R19 at the point where the peak level stops increasing. FM30 Series Technical Manual Page 33...
- Page 34 10.10 Power supply flow diagram )))))))))))))))))))))))))))))))))) FM30 Series Technical Manual Page 34...
- Page 35 10.11 Wiring diagrams )))))))))))))))))))))))))))))))))) FM30 Series Technical Manual Page 35...
- Page 36 FM30 Series Technical Manual Page 36...
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Page 37: Declaration Of Conformity
ETS 300 384:1995 Radio broadcasting systems; Very High Frequency (VHF), frequency modulated, sound broadcasting transmitters Signed: Date of Issue: On file 16 . 05. 2001 for and on behalf Pyers Easton of sbs, UK FM30 Series Technical Manual Page 37...
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