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Paradigm MAF 900-60S User Manual

Multi-carrier power amplifier
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MAF 900-60S
MULTI-CARRIER
POWER
AMPLIFIER
USER MANUAL

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Summary of Contents for Paradigm MAF 900-60S

  • Page 1 MAF 900-60S MULTI-CARRIER POWER AMPLIFIER USER MANUAL...

  • Page 2: Table Of Contents

    Table Of Contents Page Section 1 General Description ..................1 Section 2 Specifications ....................2 Mechanical Specifications ................3 Environmental Specifications ...............4 Section 3 Multi-Carrier Power Amplifier Principals of Operation.......5 Principals of Operation .................6 Principals of Operation .................7 Section 4 Operating Instructions...................8 Section 5 Installation Instructions.................9 Installation Instructions................10 Installation Instructions................11...

  • Page 3: General Description

    95°C. The amplifier will auto restart when heat sink temperature decreases to 75°C. This will prevent thermal run away of the MCPA. Each MAF 900-60S MCPA will generate 1900 BTU of heat at full power. Proper cooling and ventilation is essential for continuous operation of the amplifier.
  • Page 4 Section 2 MAF 900-60S Amplifier Specification The MAF 900-60S MCPA series electrical specification: Frequency Range 935-940 MHz Channel Spacing 25 kHz Input Power +5 dBm Output Power 80 Watts (49.00 dBm) Gain +58 dB ±0.2 dB Gain Flatness Normal Operating Voltage...
  • Page 5 MAF 900-60S MCPA series mechanical specifications: Physical Dimension of MCPA 13.82 in. high x 3.90 in. wide x 17.0 in. long Weight 31.5 lbs. Connector Type D-Sub, Hybrid, Plug-in Type RF Connector: PKZ 26- 0020 series straight plug (Phoenix Co.)

  • Page 6: Environmental Specifications

    MAF 900-60S MCPA series environmental specifications Operating Temperature 0° to 60° C. Storage Temperature -40° to 80° C. Relative Humidity 5%-90% RH (non-condensing) Operating Air Pressure 860 to 1060 mbar Shock 40 m/s s* @ 22 ms half sinusoid shock...

  • Page 7: Principals Of Operation

    Section 3 Principals Of Operation 3.1 Multi-Carrier Power Amplifier (MCPA) Functional Description The MAF 900-60S MCPA is a linear, feed-forward multi-carrier power amplifier. The operating frequency of the amplifier is 935 to 940 MHz. The amplifier is designed to operate with a 2-way paging base station radio transceiver using GMSK modulation.
  • Page 8 3.2 Pre- Amplifier The input of the amplifier uses two stages of class AB amplification that provide approximately 13.5 dB of gain in the 5 MHz band from 935 MHz to 940 MHz. The amplifier operates on + 27 Vdc. 3.3 Three-Stage Pre -Main Amplifier The input of the amplifier uses three stages of class AB amplification, which provide approximately 32 dB of gain in the 5 MHz band from 935 MHz to 940 MHz.
  • Page 9 3.7 Loop Control Circuit The primary function of the 1 loop is to provide an error signal for the 2 loop. The primary function of the 2 loop is to amplify the error signal to cancel out spurious products developed in the main amplifier. The input signal is amplified by a pre-amplifier and fed to a coupler and delay line.

  • Page 10: Operating Instructions

    4.1 Introduction This sections contains the general operating instructions for Paradigm Wireless Systems MAF 900-60S MCPA. This will help guide the user on proper operation of the MCPA. 4.2 Initial Start-Up and Operating Procedure To perform initial start-up, proceed as follows: 1.
  • Page 11 5.1 Introduction This section contains unpacking, inspection, installation instructions and recommendations for the MAF 900-60S MCPA. It is important that the operator perform the following tasks correctly and in good faith. 1. Carefully read all materials in this section prior to equipment unpacking or installation.

  • Page 12: Installation Instructions

    • Paradigm Wireless Systems may not accept returns without an RMA. 5.6 Installation Instructions Model MAF 900-60S MCPA is designed for use in a 900 MHz 2-way paging transceiver radio base station. The host enclosure must permit access to the sub-rack for DC power,...
  • Page 13 WARNING Verify that all circuit breakers on the MAF 900-60S MCPA is in the OFF position and (Reset) switch is in OFF position before installation in sub-rack. Turn OFF all external power to the sub-rack before installing MAF 900-60S MCPA 1.

  • Page 14: Maintenance

    Section 6 Maintenance 6.1 Introduction This section contains periodic maintenance and performance test procedures for Paradigm Wireless Systems MAF 900-60S Multi-Carrier Power Amplifier. NOTE Check your sales order and equipment warranty before attempting to service or repair the unit. Do not break the seals on equipment under warranty or the warranty will be voided.
  • Page 15 Table 6-2 Test Equipment Required Nomenclature Manufacturer Model Network Analyzer Agilent 8753 ET Spectrum Analyzer Agilent 8560E Power Meter Agilent E4418B Power Meter/Sensor Agilent 437B / 8481A Signal Generator IMD-801D-03A Directional Coupler Agilent 778D Attenuator Weinschel Corp 53-30-34 Attenuator Narda 766-20 6.4 Performance Test Performance test should be performed every 12 months to ensure that the amplifier meets...
  • Page 16 Apply +27 Vdc from the power source. Apply 4-15 Watt continuous random tones from the RDL to the MAF 900-60S MCPA. Composite power will be 60 Watts measured from the Power Meter. Setup Spectrum Analyzer for Center Frequency (937.00 MHz), Start Frequency (930 MHz), Stop Frequency (945 MHz) Span (200 kHz) RES BW (1.0 kHz)
  • Page 17 Table 6-3 MAF 900-60S MCPA Test Data Sheet Date_________________________ Module S/N___________________ TEST CONDITIONS: Load and Source Impedance: 50 Ohms VSWR: < 1.2:1 Supply Voltage: +27 Vdc Temperature: Room Temperature TEST SPECIFICATION DATA Spurious Voltage = +27 Vdc Emission out = 15 Watts...
  • Page 18 6.8 Field Replacement of the MAF 900-60S The MAF 900-60S MCPA can be replaced in the field on the site by a qualified technician with experience maintaining RF power amplifiers and radio equipment. To replace a power amplifier module, proceed as follows: 1.

  • Page 19: Troubleshooting

    Section 7 Troubleshooting 7.1 Introduction This section contains a list of problems that may occur. Paradigm Wireless Systems has suggested corrective action that may correct the problem. If the suggested corrective action does not eliminate the problem, please contact your Paradigm Wireless Systems representative for further instructions.