SRK FMA300 User Manual Download Page 4 | Manualshive

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SRK FMA300 User Manual Download Page 4

FMA 300 Manual



2003 SRK Electronics Pty Ltd

1

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.

Applications include low power broadcast, narrowcast, community broadcast, rebroadcast for
tunnels, student radio stations and as a driver for high power transmitters.

The FMA300 is designed and built in Australia.

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Summary of Contents for FMA300

Page 1: ...ACN 089 050 564 ABN 44 089 050 564 8 Victoria Grove Hawthorn East VIC 3123 Australia...

Page 2: ...4 4 Setting output power 4 5 Setting channel frequency 4 6 Setting audio gain 4 7 Selecting pre emphasis and input impedance 4 8 Enabling disabling stereo 4 9 SCA option 4 10 Protection 4 11 Remote op...

Page 3: ...duals that habitually work close to the transmitting antenna The RF power devices of this equipment employ Beryllium Oxide This substance is extremely toxic if pulverised On no account should any RF p...

Page 4: ...vice in the FM band Its features include Frequency agile Extensive self test and auto diagnostics Rugged design Conservatively rated Applications include low power broadcast narrowcast community broad...

Page 5: ...cked 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 p...

Page 6: ...cy described in the specifications All electrical wiring must be carried out in accordance with local laws standards and regulations If power supply voltages regularly fall outside specifications then...

Page 7: ...e transmitter must be tuned to minimise reflections Whilst the transmitter is designed to withstand high levels of reflection for short periods continually high levels of reflected power will degrade...

Page 8: ...n alarm or failure condition exists The cause of any alarm should be investigated 4 Air inlets These inlets allow air to enter the amplifier for cooling and must not be obstructed 5 Meter parameter pa...

Page 9: ...ched on by depressing the power switch 11 to the up position If mains voltage is present then the adjacent neon should illuminate The fans will start the auxiliary power indicators will light and the...

Page 10: ...l continue to function albeit at a reduced output power indefinitely until the reflected power reduces The amplifier alarm LED HIGH SWR will light If the temperature of the RF amplifier becomes excess...

Page 11: ...sponse is sent a carriage return line feed and are sent FP CR Returns forward power in the form XXXW LF CR For example FP CR command 300W LF CR response from amplifier Note that for forward powers of...

Page 12: ...where X can be either 0 or 1 A 1 indicates a failure a 0 indicates a pass The first byte indicates high temperature the second indicates a high input RF condition the third indicates a high SWR condit...

Page 13: ...Forward output power The forward output power of the amplifier is displayed in watts 300W maximum Reverse output power The reverse output power of the amplifier is displayed in watts 30W maximum Forwa...

Page 14: ...ny 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...

Page 15: ...llows monitoring of both forward and reverse output power The whole amplifier is controlled and metered by the control board assembly The auxiliary PSU generates 5V for the control board 6 2 Amplifier...

Page 16: ...bout 5V this indicates that an over O P power condition exists Likewise U9C and a high SWR condition U9B and U9C constantly compare the actual forward and reflected power with thresholds set by VR3 an...

Page 17: ...OWER HIGH TEMPERATURE HIGH O P SWR HIGH O P POWER FWD O P POWER REV O P POWER FWD I P POWER AMP TEMP PSU TEMP AMP VOLTS AMP CURRENT FMA300 300W FM AMPLIFIER PSU AMP 48V RF IN RF OUT Fig 4 1 FMA300 Fro...

Page 18: ......

Page 19: ...GY GREY W WHITE P PINK BK R BLACK RED GN Y GREEN YELLOW FAN RF OUT RF IN RF OUT 50V PSU AMPLIFIER PALETTE OUPUT DIRECTIONAL COUPLER N TYPE N TYPE 0V 50V R BK FMA300 Wiring Diagram 1 J4 SCREW 1 J7 SCRE...

Page 20: ...1K VR11 47K D2 12V Q2 2N5401 R25 4K7 R34 1K R11 1K C18 10uF C26 100nF V R13 10K AMP CURR VR10 10K R31 100K V AMP VOLTS R2 10R VCC VCC R3 10R Z19 DSS9 Z20 DSS9 1 2 J11 5V VR14 10K D7 1N4148 D8 1N4148 R...

Page 21: ...15R 1W C30 100nF 100V C34 10uF 100V C22 470pF C23 470pF C36 39pF 50V R13 10mR R2 75R C3 1uF C4 1uF LM35 5V L1 45nH L3 L4 L5 L6 L7 J3 RF OUT C38 22pF C39 22pF C42 36pF C43 36pF C44 36pF C45 36pF C50 39...

Page 22: ...vidual susceptibility however a small percentage of workers may experience discomfort from some substances at concentrations at or below the threshold limit a smaller percentage may be affected more s...

Page 23: ...for an allergic dermal response Eyes Injury can result form particulate irritation or mechanical injury to the eyes by dust or particulate Exposure may result from direct contact with airborne partic...

Page 24: ...individuals who are sensitized to beryllium or who have diagnosis of chronic beryllium disease This uncertainty leads some physicians to advise a reduction or elimination of further exposure to beryll...

Page 25: ...arments or work clothing must be worn by persons who may become contaminated with dusts fumes or powders during activities such as machining furnace rebuilding air cleaning equipment filter changes ma...

Page 26: ...is recommended to ensure adequate efficiency is maintained Wastewater Wastewater regulations can vary considerably Contact your local and state governments to determine their require ments Toxic Subst...

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