Paradigm MAF 900-60S Скачать руководство пользователя страница 7 | Manualshive

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Paradigm MAF 900-60S Скачать руководство пользователя страница 7

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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.
Minimum channel spacing is 25 kHz. Each amplifier has a digital control board that
controls the amplifiers performance and continuous IMD cancellation over temperature
and phase. Continuously comparing active paths with passive references, and correcting
for small variations through the RF feedback controls maintain constant gain. An LED on
the front panel of the amplifier monitors status of the amplifier. Multi-color LED changes
conditions when alarming of the amplifier. When MCPA failure occurs, the alarm signal
would be transmitted to the host system via the D-subminiature connector at the rear of
the amplifier. The amplifier is compliant to the requirements of FCC Part 90 with respect
to spurious emissions.

The amplifier is composed of:
A preamp
A pre-main amplifier
A main amplifier
A pre-error and error amplifier
Alarm monitoring and control

Multi-Carrier Power Amplifier Functional Block Diagram

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Содержание MAF 900-60S

Страница 1: ...MAF 900 60S MULTI CARRIER POWER AMPLIFIER USER MANUAL ...

Страница 2: ...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 Section 6 Maintenance 12 Maintenance 13 Maintenance 14 Maintenance 15 Maintenance 16 Section 7 Troubleshooting 17 ...

Страница 3: ...stations using GMSK modulation The MCPA is designed to integrate with a sub rack system Total composite output power is 80 Watts from the MCPA The MCPA draws 27 Vdc power from the sub rack The LED on the front panel of the MCPA will be GREEN during normal operation Any alarm condition will turnthe LED to RED or AMBER This will indicate an alarm condition within the MCPA External alarms for connect...

Страница 4: ... Consumption 27 5 Amps 80 Watts Power Output Abnormal Operating Voltage 24 Vdc 28 Vdc Efficiency 10 77 RF Gain Variation over Temperature 0 5 dB 0 60 C 27 Vdc Gain Variation over Dynamic Range 0 5 dB over 20 dB 27 Vdc IMD 65 dBc min 25 kHz channel spacing 75 Watts 63 dBc min 24 Vdc to 28 Vdc Modulation Type GMSK Output Return Loss 14 dB minimum Output Protection Mismatched Protected Output Isolati...

Страница 5: ...10 Reset 2 RX 11 Reserved 3 GND 12 Reserved 4 TX 13 Amp Address 1 5 TX 14 Amp Address 2 6 GND 15 Amp Address 3 7 LPA Detect 16 Reserved 8 Summary 17 Reserved 9 DC ON OFF Font Panel LED Display LED type SMD RUN GREEN MCPA enabled for operation ALARM Major RED MCPA disabled MAJOR alarm occurred LED is ON ALARM Minor AMBER MCPA enabled MINOR alarm ALARM Major RED MCPA disabled ALARM Minor GREEN Blink...

Страница 6: ... up to 0 3 back Vibration Bellcore TR NWT 000063 1 m s 0 1 200 Hz Corrosion Resistance Salt Fog The MCPA shall comply with the requirements of Bellcore Technical Reference TA NWT 000487 Issue 2 Section 4 12 Altitude All specifications shall be met at an altitude up to 15 000 feet where the maximum external ambient temperature is decreased by 0 5 C 1000 feet above sea level The MCPA shall not susta...

Страница 7: ...ntinuously comparing active paths with passive references and correcting for small variations through the RF feedback controls maintain constant gain An LED on the front panel of the amplifier monitors status of the amplifier Multi color LED changes conditions when alarming of the amplifier When MCPAfailure occurs the alarm signal would be transmitted to the host system via the D subminiature conn...

Страница 8: ...s and amplified in the pre main amplifier The output from the pre main amplifier is fed to the class AB main amplifier The signal output from the main amplifier is sampled using a coupler The sampled signal is combined with the main input signal and input to the second feed forward loop The error signal is attenuated phase shifted 180 degrees then fed to the error amplifier where it is amplified t...

Страница 9: ...ied to the same power level as the input sample The signal is then coupled to the error signal on the main output signal The final output is monitored by the 2nd loop and adjusted to ensure that the signal distortion and intermodulation distortion IMD on the final output is cancelled out 3 8 Amplifier Module Cooling Although each amplifier contains it own heat sinks forced air is required for cool...

Страница 10: ... be of 50 ohm Any changes in impedance will cause severe mismatch and VSWR to occur Do not operate the amplifier without a load attached to output of sub rack 3 Connect all RF input and output cables to the sub rack 4 Ensure Reset switch to OFF position and source power is un keyed or turned off 5 Connect 27 Vdc power source to sub rack 6 Turn 27 Vdc to ON position Place Reset to ON position 7 Ens...

Страница 11: ...eaker requirements are essential 5 3 Electrical Service Recommendations Paradigm Wireless Systems recommends that Proper AC line conditioning and surge suppression be provided on the primary AC input to the 27 Vdc source All electrical service should be installed in accordance with the National Electrical Code any applicable state or local codes and good engineering practice Grounding of all equip...

Страница 12: ...wer may damage the equipment If possible inspect the equipment in the presence of the delivery person If the equipment is damaged The carrier is your first recourse A claim should be filed with the carrier once the extent of damage is assessed Careful immediate inspection is important if the carrier is suspect of damage If the equipment is damaged and must be returned to the factory Contact your P...

Страница 13: ... in host radio base station 6 Before installing the MAF 900 60S MCPA into the sub rack inspect the 21 pin D sub combo connector on the rear of each amplifier Verify that all pins are straight no pins are recessed and that the alignment shield is not bent WARNING Do not slam amplifiers into the sub rack Forcing the amplifier into the sub rack at too fast a rate may cause pins on the 21 pin D sub co...

Страница 14: ...be performed Table 6 1 Periodic Maintenance Task Interval Action Inspection Cables and Connectors 3 months Inspect signal and power cables for frayed insulation Check RF connectors ensure connectors are tight Performance Tests 12 months Annual performance test as outlined in paragraph 6 4 Clean Fans Heat Sinks 3 months Inspect for debris Remove dust with soft cloth brush or vacuum cleaner 6 3 Test...

Страница 15: ...al 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 the operational specifications NOTE The frequencies used in this test are typically within the operating 5 MHz band of 935 MHz to 940 MHz Select evenly spaced F1 F2 F3 and F4 frequencies that cover the instan...

Страница 16: ...asure and record data on Table 6 3 6 7 Gain Test Disconnect spectrum analyzer from the MAF 900 60S Connect Network Analyzer to MCPA Set Network Analyzer as follows a Normalize Network Analyzer for gain and return loss b Set start frequency to 935 MHz Set stop frequency to 940 MHz Setup Network Analyzer for 2 channel measurement Set markers to 935 MHz 937 MHz 940 MHz c Adjust input power of Network...

Страница 17: ...y Voltage 27 Vdc Temperature Room Temperature TEST SPECIFICATION MIN MAX DATA Spurious Emission Voltage 27 Vdc P out 15 Watts per channel 935 MHz 940MHz 63 dBc RF Gain Voltage 27 Vdc P out 60 Watts 935 MHz 940MHz 58 dB Gain Flatness Voltage 27 Vdc P out 60 Watts 935 MHz 940MHz 0 5 dB Input Return Loss Voltage 27 Vdc P out 60 Watts 935 MHz 940MHz 15 dB PASS FAIL Tested By ...

Страница 18: ...on front of amplifier to OFF position 2 Loosen the thumbscrews that secure the amplifier to the sub rack 3 Slide amplifier out of sub rack CAUTION When removing amplifier from the sub rack it is important to support the amplifier such that the rear of the module does not suddenly drop when the guide rail disengages from the rack A drop such as this could damage the rear of the 21 pin D sub connect...

Страница 19: ...m Wireless Systems representative Over Heating Shut Down 1 Check for operation of fans on sub rack assembly 2 Check for debris in heat sink 3 Check air conditioning venting unit for proper operation 4 Contact your Paradigm Wireless Systems representative Over Power Shut Down 1 Verify host system radio output power level 2 Verify sub rack input attenuation 3 Contact your Paradigm Wireless Systems r...

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