SRK FMA300 User Manual

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(ACN 089 050 564 ABN 44 089 050 564)

8 Victoria Grove

Hawthorn East

VIC 3123

Australia

Table of Contents

Summary of Contents for SRK FMA300

Page 1 (ACN 089 050 564 ABN 44 089 050 564) 8 Victoria Grove Hawthorn East VIC 3123 Australia...
Page 2 Setting audio gain Selecting pre-emphasis and input impedance Enabling/disabling stereo SCA option 4.10 Protection 4.11 Remote operation 4.12 Audio limiter 4.13 Amplifier metering Maintenance Recommended maintenance schedule Circuit description Equipment overview Amplifier Control Board Drawings © 2003 SRK Electronics Pty Ltd...
Page 3 AN EARTH WIRE. IT IS IMPERATIVE THAT THIS EQUIPMENT IS CONNECTED TO A MAINS OUTLET THAT HAS AN EARTH. IN COUNTRIES WHERE EARTHED OUTLETS ARE NOT MANDATORY, IT IS THE CUSTOMER’S RESPONSIBILITY TO ENSURE THAT THIS EQUIPMENT IS APPROPRIATELY EARTHED. © 2003 SRK Electronics Pty Ltd...
Page 4: General Description
FMA 300 Manual GENERAL DESCRIPTION The FMA300 is a high quality 300W amplifier intended for audio broadcast service in the FM band. Its features include: • Frequency agile. • Extensive self test and auto diagnostics. • Rugged design. • Conservatively rated.
Page 5 FMA 300 Manual UNPACKING This section details the way in which the FMA300 should be unpacked upon receipt by the customer. Upon receipt the amplifier should be visually inspected to ensure that no damage has occurred in transit. Along with the amplifier, the following items should also be present: This manual •...
Page 6: Installation
General This section describes the installation and infrastructure requirements for the FMA300. Departure from the instructions contained herein may void any warranty provided by SRK. Environmental The transmitter is intended for indoor use. The transmitter should be protected from rainfall and direct sunlight, extremes of temperature and humidity and from conditions of high dust levels.
Page 8: Operation
4.2 RF out This is the RF output connector and mates with a male N type. Amplifier forced air exhaust This is the exit port for the forced air cooling. Do not obstruct. © 2003 SRK Electronics Pty Ltd...
Page 9 “HIGH I/P POWER” alarm will light and the amplifier shut down. Ensure that the RF drive is applied after the amplifier is switched on. The FMA300 may be switched off at any time by depressing the power switch to the down position.
Page 10 If the reflected power from the antenna exceeds 30W then the output RF power will be automatically reduced to bring the reflected power back to 30W. Under this condition the FMA300 will continue to function, albeit at a reduced output power, indefinitely until the reflected power reduces. The amplifier alarm LED “HIGH SWR” will light.
Page 11 FMA 300 Manual 4.11 Remote operation. The FMA300 may be monitored remotely via the “TELEMTRY” connector on the rear of the unit. This is an RS232 standard connection with the following characteristics: Baud rate: 9600 Data bits: Parity: NONE Stop bits:...
Page 12 Invalid_command.__Send_HP?(CR)_for_command_syntax.<LF><CR> > Should it be necessary to make connection to the remote port using cables running external to the building housing the FMA300, it is recommended that external filtering and transient protection be installed on these lines. 4.12 Audio limiter...
Page 13 4.13 Amplifier metering. The FMA300 has extensive metering to allow a number of parameters to be monitored. The parameter to be measured is selected by depressing the meter selection switch until the desired parameter is indicated by the array of lamps next to the switch. Each press of the button selects the next parameter.
Page 14: Maintenance
MAINTENANCE Recommended maintenance schedule The FMA300 will give many years of trouble free service with little attention. However, it is recommended to clean the fan filters once per year. This can be done by switching off the transmitter and unclipping the plastic fan guards on the front of the unit. The filters may be washed gently on clean, warm water and then dried before re-fitting.
Page 15: Circuit Description
Auxiliary PSU • These assemblies are interconnected as per “FMA300 wiring diagram”. The 50V SMPSU generates 50V at up to 10A for the RF amplifier. It incorporates inrush current limiting and active power factor correction for excellent power factor. This is an OEM unit.
Page 16 The Front panel display is driven in a multiplex format by U1. Q1, 3, 5, 6 and 7 are all switched on in turn, one at a time. Coincidentally, the appropriate segments are connected to ground by U1. This happens several hundred times a second, giving the appearance of constant brightness. © 2003 SRK Electronics Pty Ltd...
Page 17 +48V RF IN RF OUT +15V -15V HIGH I/P POWER HIGH TEMPERATURE HIGH O/P SWR HIGH O/P POWER FWD O/P POWER PSU TEMP REV O/P POWER AMP VOLTS FWD I/P POWER AMP CURRENT AMP TEMP Fig 4.1 FMA300 Front View...
Page 19 BK/R BLACK/RED GN/Y GREEN/YELLOW AMPLIFIER PALETTE OUPUT RF IN N TYPE N TYPE N TYPE DIRECTIONAL RF OUT RG303 RG303 COUPLER RF IN RF OUT Title FMA300 Wiring Diagram Size Number Revision Date: 7-Sep-2010 Sheet of File: C:\Client98\Files\FMA300 new.sch Drawn By:...
Page 20 VR14 SELECT PARAMETER +10V 7660 TEST TEST 10uF CAP+ CAP+ 10uF 1N4148 CAP- VOUT CAP- VOUT +10V LT1054 10uF 4N23 1N4148 10uF 220R Title BIAS CUT FMA300 CONTROL BOARD Size Number Revision Date: 7-Sep-2010 Sheet of File: C:\Client98\Files\fma300cont4.sch Drawn By:...
Page 21 36pF 36pF RG316 470pF 22pF 22pF 470pF 68pF 470pF 39pF RG316 RG316 45nH 470pF 470pF 470pF MRF151G RG316 4.7nF RFP-10-100 RFP-10-100 TEMP LM35 Title FMA300 AMPLIFIER PALETTE Size Number Revision Date: 7-Sep-2010 Sheet of File: C:\Client98\..\FMA300 amp palette.sch Drawn By:...
Page 22: Material Safety Data Sheet
MATERIAL SAFETY DATA SHEET PRODUCT IDENTIFICATION Trade Name: Beryllia Ceramic Chemical Family: Beryllium Compound Synonym: Beryllium Oxide, Beryllia, Thermalox, Super Beryllia HAZARDOUS INGREDIENTS Constituents OSHA(1995)* ACGIH(1994-95)* CAS # NIOSH/ RTECS # Beryllium PEL: 0.002 TLV: 0.002 7440-41-7 (Be) DS1750000 Ceiling: 0.005 TLV-STEL: NA 1304-56-8 (BeO) DS4025000...
Page 23 HEALTH HAZARD INFORMATION Emergency Overview: If this material is involved in a fire, pressure-demand self-contained breathing apparatus and protective clothing must be worn by persons potentially exposed to the metal fumes or airborne particulate. Primary Routes of Exposure: Inhalation: An exposure to airborne beryllium in excess of the occupational standard can occur when sintering, machining, grinding, sanding, abrasive cutting, polishing, laser scribing and trimming, chemical etching, crushing, or otherwise abrading the surface of this material in a manner which generates finely divided particles.
Page 24: Reactivity Data
INGESTION: Swallowing beryllium oxide dust can be treated by having the affected person drink large quantities of water and attempting to induce vomiting, if conscious. Obtain medical help. SKIN: Skin cuts and abrasions should be treated by standard first aid. Skin contamination can be removed by washing with soap and water.
Page 25 Respiratory Protection: When potential exposures are above the occupational limits shown in this MSDS, approved respirators must be used as specified by an Industrial Hygienist of other qualified professional. Respirator users must be medically evaluated to determine if they are physically capable of wearing a respirator. Quantitative an/or qualitative fit testing and respirator training must be satisfactorily completed by all personnel prior to respirator use.
Page 26: Special Precautions
VIII SPECIAL PROTECTION INFORMATION Transport Information: There are nor U.S. Department of Transportation hazardous material regulations which apply to the packaging and labeling of this product as shipped by ESPI. Hazard Communication regulations of the U.S. Occupational Safety and Health Administration require that this material be labeled. Regulatory Information: OSHA Hazard Communications Standard, 29 CFR 1910.1200: Beryllium is considered a hazardous ingredient.