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SRK Electronics  FMA501 manual 

 

 2007 SRK Electronics Pty Ltd 

1 

FMA501 Manual 

 
Safety notice 
 
1 

General description 

 
2 

Unpacking 

 
3 

Installation 

 
4 

Operation 

 

4.1 

Front panel 

4.2 

Rear panel 

4.3 

Switching on and off 

4.4 

Initial setup 

4.5 

Measuring other parameters 

4.6 

Setting power supply voltage 

4.7 

Setting the date and time 

4.8 

Protection 

4.9 

Remote operation 

 
5 

Maintenance 
 
5.1 

Recommended maintenance schedule 

 
6 

Circuit description 

 

6.1 

Equipment overview 

6.2 

Power supply 

6.3 

Control board 

6.4 

Amplifier palette 

6.5 

Output directional coupler 

 
7 

Trouble shooting 

 

7.1 

Diagnostics 

7.2 

Disassembly 

 
Drawings 

Summary of Contents for FMA501

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

Page 2: ...nd off 4 4 Initial setup 4 5 Measuring other parameters 4 6 Setting power supply voltage 4 7 Setting the date and time 4 8 Protection 4 9 Remote operation 5 Maintenance 5 1 Recommended maintenance sch...

Page 3: ...y individuals 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...

Page 4: ...cast service in the FM band Its features include Wideband Energy efficient and high power factor Extensive metering Rugged design Conservatively rated Comprehensive telemetry Flexible configuration Ap...

Page 5: ...talled in an SRK Electronics transmitter then this section is not applicable The FMA501 should be removed from its packing and the packing stored and used should it be necessary to return the FMA501 t...

Page 6: ...led in locations prone to flooding All ventilation orifices must be clear to allow adequate air flow 3 3 Electrical supply The electrical supply to the amplifier must be of the voltage form and freque...

Page 7: ...ually humid eg the base of a gutter down pipe 3 5 Antenna The antenna load connected to the amplifier must be tuned to minimise reflections Whilst the amplifier is designed to withstand high levels of...

Page 8: ...SRK Electronics FMA501 manual 2007 SRK Electronics Pty Ltd 7...

Page 9: ...SRK Electronics FMA501 manual 2007 SRK Electronics Pty Ltd 8...

Page 10: ...mote operation is performed by making connection to this DB9 socket Please refer to section 4 9 for details 7 Mains input This is the mains input 240V AC unless specified by the customer Mating connec...

Page 11: ...ny of these parameters has no effect on the operation of the amplifier 4 6 Setting power supply voltage When running at output powers of less than 300W improved efficiency and lower device dissipation...

Page 12: ...AC line voltage drops below 200V then the amplifier will shut down until line volts exceeds 210V The LCD will show UNDER AC VOLTS If the AC line voltage exceeds 275V then the amplifier will shut down...

Page 13: ...form XXXC LF CR For example AAT CR command _32C LF CR response from amplifier Note that for temperatures of 99C and below the leading zero is replaced with a space AAI CR Returns amplifier A DC curre...

Page 14: ...TD CR Returns the current time and date in the form XX XX XX_XX XX XX LF CR For example TD CR command 14 27 07_02 05 06 LF CR response from amplifier ET CR Returns the number of elapsed days the unit...

Page 15: ...h indicates a high RF output power condition For further information consult the section on protection For example BS CR command 000010 LF CR response from amplifier indicating a high SWR condition or...

Page 16: ...uted PE CR Enables PSU cut The power supply voltage will drop to a nominal value of 35V upon receipt of this command For example PE CR command Ok LF CR response from amplifier indicating that command...

Page 17: ...ectronics Pty Ltd 16 Should it be necessary to make connection to the remote port using cables running external to the building housing the FMA501 it is recommended that external filtering and transie...

Page 18: ...hedule The FMX501 will give many years of trouble free service with little or no attention The air filter on the front panel should be regularly inspected and cleaned gently with warm water if necessa...

Page 19: ...SRK Electronics FMA501 manual 2007 SRK Electronics Pty Ltd 18...

Page 20: ...and on and to reduce the output voltage whilst PSU cut is enabled Energising the diode between pins 1 and 2 of CN2 switches the PSU off A variable resistance between pins 3 and 4 allows the output vol...

Page 21: ...directional coupler provides 5 0V to the MCU Small value resistors in the supply lines of the MOSFETs on the amplifier palette generate voltages proportional to the drain currents These voltages are...

Page 22: ...nal at T10 is thus a nominal 500W unfiltered JP1 and JP2 are high current links which enable tuning of the output filter in isolation JP2 is only fitted during factory testing JP1 is the only link fit...

Page 23: ...be investigated in a similar manner paying particular attention to input power and the relative values of the amplifier DC currents As a guide these two currents should be within 20 of each other If n...

Page 24: ...ntly pull the rear panel away to expose the mains wiring Undo the earth stud to free up the various earth wires Pull the blue wire off of the IEC socket and the brown wire which goes to the power supp...

Page 25: ...4 5 6 J5 MTA100 6 1 6 2 7 3 8 4 9 5 TELEMETRY 1 2 3 J1 MTA100 3 1 2 J4 MTA100 2 14WAY IDC 1 2 3 4 5 ROTARY ENCODER 1 2 3 4 5 J12 MTA100 5 N TYPE RF OUT N TYPE N TYPE RG303 BNC RG58 N TYPE RF IN CABLE...

Page 26: ...A TL074 5 6 7 U9B TL074 VR1 10K R22 4K7 9V 15V R27 100K R28 100K C24 100nF C11 10nF 15V VR3 10K VPOS 1 IREF 2 RF IN 3 PWDN 4 COMM 5 FLTR 6 VRMS 7 SREF 8 U8 AD8361 C12 1nF J7 REV C29 1nF R18 62R Z7 DSS...

Page 27: ...41 HARDLINE 1 2 JP1 1 2 JP2 J2 BNC L3 L4 L5 L6 L7 J3 RF OUT C3822pF C3922pF C42 36pF C43 36pF C44 36pF C45 36pF C50 39pF C51 39pF C52 39pF C53 39pF C46 36pF C47 36pF C48 36pF C49 36pF C40 22pF C41 22p...

Page 28: ......

Page 29: ...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 30: ...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 31: ...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 32: ...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 33: ...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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