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RF Technology PA220 Operation And Maintenance Manual

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Eclipse Ser ies
RF Technology
rfinfo@rftechnology.com.au
SEPTEMBER 2003
PA220 Amplifier
Operation and Maintenance Manual
This manual is produced by RF Technology Pty Ltd
10/8 Leighton Place, Hornsby 2077 Australia
Copyright © 2001 RF Technology Pty Ltd

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  • Page 1 Eclipse Ser ies RF Technology rfinfo@rftechnology.com.au SEPTEMBER 2003 PA220 Amplifier Operation and Maintenance Manual This manual is produced by RF Technology Pty Ltd 10/8 Leighton Place, Hornsby 2077 Australia Copyright © 2001 RF Technology Pty Ltd...

  • Page 2: Table Of Contents

    4.4.1 Power Requirements 4.4.2 Frequency Range Antenna Impedance Output Power 4.6.1 Transmit Duty Cycle Spurious and Harmonics Heatsink Temperature ALC Output 4.10 Connectors 4.10.1 RF Input 4.10.2 RF Output 4.10.3 25-Pin Connector 4.10.4 9-Pin Connector Page 2 RF Technology PA220...
  • Page 3 CONTENTS CONTENTS Engineering Diagrams Block Diagram Circuit Diagrams Component Overlay Diagrams Parts List RF Technology PA220 Page 3...

  • Page 4: Operating Instructions

    Oper ating Instr uctions The PA220 is part of the Eclipse range of modular base station equipment. It is a power amplifier capable of delivering 100 Watts in the VHF frequency range. It is designed to complement the T220 transmitter, and mounts in a standard Eclipse sub-rack.

  • Page 5: Internal Adjustments

    RF Level Detector The forward RF power threshold associated with the RFO LED on the amplifier front panel is set by RV3. This is nominally set at half to three- quarters of the preset output power. RF Technology PA220 Page 5...

  • Page 6: Amplifier I/O Connections

    This corresponds to peak voltages in excess of 100 while currents in excess of 2 Amperes may flow. Appropriate care should be taken when working on the PA220 to avoid making or breaking connections when the amplifier is operating, and to avoid RF burns through close proximity to live connections, etc.

  • Page 7: Amplifiers

    2.5 Power Contr ol Cir cuits The forward and reverse voltages from the directional coupler are amplified and inverted by U1a and U1b. The amplified voltages are combined before connecting to the input of error amplifier U1d. RF Technology PA220 Page 7...

  • Page 8: Rf Output Indicator

    50Ω, 50/100W, SWR<1.2:1 RF Power Meter eg. HP437B or calibrated detector and voltmeter Table 2: Standard test equipment for the PA220 Power Amplifier 2.6 RF Output Indicator The forward power voltage is compared with the pre-set dc reference voltage from RV2 by U1c.

  • Page 9: Tuning Procedure

    Specifications 4.1 Description The PA220 power amplifiers are designed for use with the T220 series transmitters to provide 100 Watts of RF output. Output power is regulated by connecting the ALC output to the ALC input of the driving exciter. The drive from the transmitter module is then automatically adjusted to maintain the required output.

  • Page 10: Physical Configuration

    4.2 Physical Configur ation The power amplifier is designed to fit in an RF Technology sub-rack within a 19" rack frame. The installed height is 4 Rack Units (RU), or 178mm, and the depth is 350mm. The amplifier is 95.25mm or three Eclipse units wide. The amplifier uses an extruded aluminium heat sink with vertical fins.

  • Page 11: Frequency Range

    215-240MHz 4.5 Antenna Impedance Nominal load impedance is 50Ω SWR 1.5:1 or better. The PA220 will operate with a VSWR of 2:1 at all phase angles. The forward power will reduce as reverse power rises above acceptable limits, typically at an SWR of about 2.5:1.

  • Page 12: Connectors

    A front-panel, 9-pin, D-shell connector provides analogue voltages for testing purposes. A Engineer ing Diagr ams A.1 Block Diagr am Figure 1 shows the block signal flow diagram of the PA220 amplifier. Figure 2 shows the chassis wiring diagram of the PA220 amplifier. A.2 Cir cuit Diagr ams Figure 3 shows the detailed circuit diagram of the amplifier with component numbers and values.
  • Page 16 PA220 PARTS LIST PA220 Par ts List B.1 PA220 (05/9105/0220) Ref. Description Par t Number Capacitor 1N0 5% 63V NPO SM1203 46/3300/01N0 Capacitor 56pF 5% 250V MC Mica 48/3002/056P Capacitor 56pF 5% 250V MC Mica 48/3002/056P Capacitor 56pF 5% 250V MC Mica...
  • Page 17 51/1040/01M0 Resistor 100K 5% .25W Axial 51/1040/100K Resistor 0R1 WW 10W 51/0010/00R1 Resistor 0R1 WW 10W 51/0010/00R1 Resistor 10K 5% .25W Axial 51/1040/010K Resistor 10K 5% .25W Axial 51/1040/010K Resistor 10K 5% .25W Axial 51/1040/010K Page 18 RF Technology PA220...
  • Page 18 PA220 PARTS LIST Description Par t Number Resistor 270R 5% .25W Axial 51/1040/0270 Resistor 270R 5% .25W Axial 51/1040/0270 Resistor 10K 5% .25W Axial 51/1040/010K Resistor 2K2 5% .25W Axial 51/1040/02K2 Resistor 10K 5% .25W Axial 51/1040/010K Resistor 10K 5% .25W Axial 51/1040/010K Resistor 10K 5% .25W Axial...
  • Page 19 T220 PARTS LIST Description Par t Number Screw 4-40 x 6 CSK PD BZNK 70/4415/0006 Label, PA Front Panel 81/9105/0001 Label, S/W and SMA 81/9100/PA220 Gnd Lug M3 Utilux H254 39/M301/H254 Page 20 RF Technology PA220...
  • Page 20 OVER TEMP. FWD.PWR. C112 56pF 56pF +13.8 18pF REV.PWR. 100pF Size: Number: 05/9105 R7 Revision: RF Technology Pty Ltd Print Date: 24-Oct-2003 16:01:32 Sheet Unit 10, 8 Leighton Place Hornsby, NSW 2077 Rev. Release Date: Originator: Australia File: \\Goanna\master\CAD_File\Protel99\220MHz\220MHz.ddb - PA220-Rev3.sch...

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