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Summary of Contents for SBS FM10
- Page 1 FM10 FM EXCITER/TRANSMITTER TECHNICAL MANUAL...
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Page 2: Table Of Contents
Information in this document is subject to change without notice and does not represent a commitment on the part of Eddystone Broadcast Limited. -
Page 3: Introduction
The stereo version is available with its own high quality deviation limiter and coder. This can be offered as an upgrade for the mono FM10. The unit will operate into any SWR without damage, with an effective VSWR protection circuit which reduces the output power if necessary to protect the amplifier. -
Page 4: Safety, Electrical Hazard
Safety, Electrical hazard ────────────────────────────────── This unit contains high voltages which could be fatal. YOU MUST ALWAYS ISOLATE THE UNIT FROM THE MAINS SUPPLY BY COMPLETELY DISCONNECTING IT BEFORE ATTEMPTING TO OPEN THE CASE. THIS EQUIPMENT MUST BE EARTHED. Do not expose this equipment to rain or any other source of moisture. 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. -
Page 5: Safety, Toxic Hazard
Safety, Toxic hazard ────────────────────────────────── This equipment includes devices which contain Beryllium Oxide which is a highly toxic substance. Inhalation or ingestion of even tiny particles could be injurious to health or even FATAL! Extreme care must be exercised when replacing and discarding components which may contain Beryllium Oxide. -
Page 6: Unpacking
FM10 series manual If any items are missing or damaged please inform your supplier immediately. Initial Checks Ensure that the FM10 has been set to the correct mains/line voltage for your country. The standard version is set to 230V. Page 6... -
Page 7: Controls And Connectors
Controls and Connectors ────────────────────────────────── Front Panel: POWER Mains power is applied. LIMIT The audio input level is high enough for the limiter to reduce its level (where fitted). Rear Panel: Audio input Unbalanced on female BNC connector without internal limiter or balanced on female XLR connector with optional limiter (pin 2 hot, 3 cold and 1 ground). -
Page 8: Installation
Installation ────────────────────────────────── The FM10 is normally supplied ready aligned, therefore installation should be straight forward. Before installation please read the section of this manual about Electrical safety. RF leads should be made from high quality low loss cable and connectors of the correct impedance, using the manufacturers recommended termination techniques. -
Page 9: Alignment
Whilst the Phase Locked Loop is Locking up the modulator output is muted (indicated by the PLL LOCK LED on the PLL7 PCB). When the FM10 is either powered up or the frequency changed, it will normally take about 5 seconds for the PLL to lock up. - Page 10 If a dummy load is not available then the FM10 could be set up connected to the aerial. In this case the Output Power control should be set to minimum (anti-clockwise) before powering up the FM10.
- Page 11 7.5 DLM3 PCB 1 FET BIAS Connect an audio input at 400Hz to the Mono input that is below the limit threshold, for example -20dBu. Turn R33 fully anti clockwise. Connect an oscilloscope or level meter to U3 pin 7. Turn R33 slowly clockwise until the level is reduced by 0.1dB.
- Page 12 7.6 LimX PCB 1 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. Turn R40 and R31fully anti clockwise. Connect an oscilloscope or level meter to U7 pin 7.
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Page 13: Specifications
Specifications ────────────────────────────────── Frequency range 87.5 to 108 MHz in 50kHz steps Frequency stability <± 200Hz Power output 1 - 10W Harmonic & spurious output < -76dBc AM noise < -50 wrt 100% Nominal input level 0dBu or +8dBu (adjustable) Input Electronically balanced with limiter or unbalanced Input impedance 20 kΩ... -
Page 14: How To Contact Eddystone Broadcast Limited
How to contact Eddystone Broadcast Limited ────────────────────────────────── For all enquiries write to:- Eddystone Broadcast Limited 26 Arden Road Arden Forest Industrial Estate Alcester Warwickshire B49 6EP Or telephone 01789 762278 within the UK, +44 1789 762278 from outside the UK. Or fax 01789 766033 within the UK, +44 1789 766033 from outside the UK. -
Page 15: Technical Section Contents
Technical Section Contents ────────────────────────────────── 10.1 PLL7 Modulator PCB 10.2 PSU15 Power Supply PCB 10.3 DLM3 Limiter PCB (FM10/M only) 10.4 LimX Stereo coder (FM10/S only) 10.5 FM10-PA 10W Power amplifier Page 15... - Page 16 10.1 PLL7 ────────────────────────────────── The frequency determining element is formed by coil L1 and varicap diodes VD1 and VD2, together with capacitors C17- C20. These components are used as part of a cascode oscillator whose output is then buffered by transistor T3. The RF output from T3 is impedance matched to the base of transistor T5 by RFT1, a 4 to 1 matching transformer.
- Page 17 Page 17...
- Page 18 10.2 PSU15 ────────────────────────────────── Page 18...
- Page 19 10.3 DLM3 ────────────────────────────────── Page 19...
- Page 20 Page 20...
- Page 21 10.4 LimX ────────────────────────────────── Page 21...
- Page 22 Page 22...
- Page 23 10.5 FM10-PA ────────────────────────────────── Page 23...
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Page 24: Declaration Of Conformity
Declaration of conformity ────────────────────────────────── Name of Manufacturer: Product: FM10 FM Exciter Declaration: The product described above compiles with the requirements of the Low Voltage Directive (73/23/EEC) and the protection requirements of the EMC Directive (89/336/EEC) issued by the Commission of the European Community.
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