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RF Technology PA 150 Operation And Maintenance Manual

Eclipse series
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Eclipse Series
RF Technology
rfinfo@rftechnology.com.au
February, 2003
PA 150 Amplifier
Operation and Maintenance Manual
This manual is produced by RF Technology Pty Ltd
10/8 Leighton Place, Hornsby NSW 2077 Australia.
Copyright © 1997 RF Technology.

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  • Page 1 Eclipse Series RF Technology rfinfo@rftechnology.com.au February, 2003 PA 150 Amplifier Operation and Maintenance Manual This manual is produced by RF Technology Pty Ltd 10/8 Leighton Place, Hornsby NSW 2077 Australia. Copyright © 1997 RF Technology.

  • Page 2: Table Of Contents

    CONTENTS CONTENTS Contents Operating Instructions 1.1 Front Panel Indicators 1.2 Internal Adjustments 1.3 Output Power 1.4 RF Level Detector Circuit Description 2.1 Amplifiers 2.2 Power Splitter/Combiners 2.3 Directional Coupler 2.4 Low pass Filter 2.5 Power Control Circuits 2.6 RF Output Indicator 2.7 Over Temperature Protection Alignment Procedure Specifications...

  • Page 3: Operating Instructions

    1 OPERATING INSTRUCTIONS WARNING Changes or modifications not expressly approved by RF Technology could void your authority to operate this equipment. Specifications may vary from those given in this document in accordance with requirements of local authorities. RF Technology equipment is subject to continual improvement and RF Technology reserve the right to change performance and specification without further notice.

  • Page 4: Rf Level Detector

    2 CIRCUIT DESCRIPTION RF Level Detector The RF Detector threshold for the RFO LED on the amplifier front panel is set by RV1. This is normally set at half the rated output power. WARNING Ensure that the output power setting complies with the equipment’s licence requirements.

  • Page 5: Power Splitter/Combiners

    2 CIRCUIT DESCRIPTION The amplifiers are broad band and do not have any tuning adjustments. The “A” versions are optimized for the frequency range 136-156 MHz while the “B” versions cover 154-174 MHz. The dc supply is fed to the amplifiers through resistors R21 and R22. This allows the collector current of each amplifier to be measured at the test socket.

  • Page 6: Over Temperature Protection

    3 ALIGNMENT PROCEDURE RV1 is normally set so that the RFO LED comes ON at 1-3 db below the normal power output. Over Temperature Protection Thermistor RT1 is mounted to the case of output transistor Q4. If the transistor case temperature rises above 90 degrees C the resistance of RT1 increases and Q2 is turned ON.

  • Page 7: Specifications

    4 SPECIFICATIONS Set Output Power Step Input Measure Adjust As above RF output power at Key transmitter. Adjust RV2 for the desired power Specifications Description The power amplifiers are designed for use with the T150 series transmitters to provide 50-150 watts output. Output power regulation is provided by connecting the output of the directional coupler to the ALC input of the T150.

  • Page 8: Test Points

    5 ELECTRICAL SPECIFICATIONS 4.3.2 Test Points (DB9 Connector) Forward Power Pin 8 + Gnd (pin 1) Reverse Power Pin 4 + Gnd (pin 1) Collector Current Pin 6, Pin 2 + Vcc 13.2Vdc Electrical Specifications Power Requirements Operating Voltage - 10.5 to 16 Vdc with output power reduced below 12.5 Vdc. Current Drain @ 13.2 Vdc - 10 Amps Max at 50 watts.

  • Page 9: Maximum Heatsink Temperature

    Connectors Maximum Heatsink Temperature 90 degrees C. ALC Output The ALC is intended for connection to the T150. It supplies a voltage which decreases with increasing power or temperature. Mis-Match Protection The amplifier is protected from damage when operating into a VSWR of 10/1 at all phase angles.

  • Page 10: Appendix A Block Diagram

    Page 10 RF Technology PA150...
  • Page 13 B PA150 PARTS LIST Ref. Description Part Number NOTE - ALL COMPONENTS FOR WHICH REF IS ACCOMPANIED WITH AN ASTERIX (*) ARE USED ONLY IN HIGH POWER MODELS (PA150XH) CAP 10N 10% 50V X7R RAD.2 46/2001/010N CAP 4N7 5% 400V MKT RAD.2 47/2040/04N7 CAP 10U 35V RAD ELECTRO 41/2001/010U...
  • Page 14 B PA150 PARTS LIST Ref. Description Part Number COIL AIR CORE 7T 1.5P 6.35ID 37/1635/1507 L10* IND MOLDED 6.5 TURN 37/2021/0006 L11* IND MOLDED 6.5 TURN 37/2021/0006 COIL AIR CORE 2T 2P 6.35ID 37/1400/1002 COIL AIR CORE 2T 2P 6.35ID 37/1400/1002 COIL AIR CORE 3T 2P 6.35ID 37/1635/2003...
  • Page 15 B PA150 Parts List Description Part Number RES 33K 5% 0.25W AXIAL 51/1040/033K RES 220 5% 2W AXIAL 51/1052/0220 RES 10 5% 0.25W AXIAL 51/1040/0010 RES 10 5% 0.25W AXIAL 51/1040/0010 RES 220 5% 2W AXIAL 51/1052/0220 R38* RES 220 5% 2W AXIAL 51/1052/0220 R39* RES 10 5% 0.25W AXIAL...
  • Page 16 B PA150 Parts List Description Part Number PA150B 154-174 MHz Parts These parts fitted to PA150B & BH CAP 180P 500V MICA SM1812 48/3003/180P CAP 180P 500V MICA SM1812 48/3003/180P CAP 100P 500V MICA SM1812 48/3003/100P CAP 20P 500V MICA SM1210 48/3003/020P CAP 51P 500V MICA SM1210 48/3003/051P...
  • Page 17 270P 120P +13.8 REV.PWR. (SUFFIX -AH MODELS) 270P 100P Sheet Size: Number: 05/9118 R7 Revision: RF Technology Pty Ltd Design Print Date: 20-Dec-2004 Sheet Unit 10, 8 Leighton Place Revision: Hornsby, NSW 2077 Rev. Release Date: Originator: Australia File: D:\Protel Files\Master_EDA\9118_PAVHF_FAN\9118.ddb - Documents\9118R7V7.sch...
  • Page 18 (SUFFIX -AH MODELS) 270P 100P Sheet Size: Number: 05/9118 R7 Revision: RF Technology Pty Ltd Design Print Date: 21-Feb-2006 Sheet Unit 10, 8 Leighton Place Revision: ** THESE 8 COMPONENTS ARE NOT FITTED ON PA150BH (100W) MODELS Hornsby, NSW 2077 Rev.

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