Eagle UHF 250 WATT POWER AMPLIFIER User Manual Download Page 18 | Manualshive

Page: 18 / 31

background image

System

Components

Power Amplifier – Control Section

The Power Amplifier Control Board provides all of the Power Amplifier
control functions necessary to operate any of the Eagle Power
Amplifier configurations.

DC / DC

Converter

FAN

FAN

P.A. (R19)

Power Adjust

(Clockwise Increases)

Notch

Drive Stage

Voltage Meter

Calibration

RF Input

Calibration

Forward Power

Calibration

Reflected Power

Calibration

Supply Voltage

Meter Calibration

Low power LED

Power On LED

High VSWR LED

High Temp LED

RF In LED

PA Control

Board

Figure 4 – Power Amplifier Control Board

Version 3

3-5

07/18/01

«
...
16
17
18
19
20
...
»

Summary of Contents for UHF 250 WATT POWER AMPLIFIER

Page 1: ...HF 250 WATT POWER AMPLIFIER USER Manual EAGLE WIRELESS INTERNATIONAL 101 Courageous Drive League City TX 77573 Telephone 281 538 6000 Fax 281 334 5302 Toll Free 1 800 628 3910 www eglw com sales eglw com ...

Page 2: ...system or translated into any language in any form by any means electronic mechanical magnetic optical chemical hydraulic manual or otherwise without prior written consent of EAGLE WIRELESS INTERNATIONAL INC EAGLE WIRELESS INTERNATIONAL INC software and firmware programs used in the UHF 250 WATT POWER AMPLIFIER is protected by copyright Therefore no software or firmware may be copied or reproduced...

Page 3: ...ss International s Customer Service Department is dedicated to provide complete product support to all its customers For Technical Assistance only call the toll free number 1 800 628 3910 between the hours of 8 00 A M and 5 00 P M CST For after hours emergencies call 281 538 6000 for instructions If you reach voice mail please leave a message and your call will be returned promptly Customers shoul...

Page 4: ...ansmitter must be maintained within specified limits It is recommended therefor that these three parameters be checked before the station is placed in service 4 The power input to the final radio frequency stage shall not exceed the maximum figure specified on the current station authorization This power input shall be measured and the results recorded a When the transmitter is initially installed...

Page 5: ...but for all external connections added protection against lightning attack should be considered For Transmitters used for high power applications with tower antennas the following measures will provide sufficient protection against minor lighting attacks Keep the antenna tower grounding resistance as low as possible The ground rods should be made of copper and be at least eight feet long Multiple ...

Page 6: ...trap and stand on a conductive mat which is connected to the ground through a 100K ohm resistor Ground all test equipment and soldering stations that are electrically powered Always connect the ground lead of the test equipment to the Base Station Extend A Page and or Power Amplifier which ever is being serviced first and then the test probe While disconnecting remove the test probe prior to the g...

Page 7: ...rcumstances the warranty will expire not later than one 1 year after date of such first shipment 2 This warranty is void and adjustment will not be allowed for products which have been subjected to abuse improper application or installation unauthorized alteration or accidental negligent damage in use storage transportation or handling 3 This warranty does not apply to a Incandescent lamps LEDs ba...

Page 8: ...ter such notification Seller may return product as is to Buyer transportation collect 6 In returning products under this warranty Buyer shall comply with terms set forth in the Warranty Return Procedures Buyer shall comply with terms set forth in the Warranty Return Procedures Buyer in all cases will obtain and comply with Seller s packaging and shipping instructions Buyer will pay for packing tra...

Page 9: ...Table of Contents Page Preface i Limited Warranty vi Introduction 1 1 Features and Specifications 2 1 Major System Components 3 1 Schematics and Appendices 4 1 ...

Page 10: ...Introduction Section 1 Introduction UHF 250 WATT POWER AMPLIFIER Version 3 1 1 07 18 01 ...

Page 11: ...peration for the paging and link application The POWER AMPLIFIER has a modular design approach thus making it easy to operate and maintain the unit The heat sink design is rated well above the requirement for a 500 watt power amplifier operating on a continuous basis The heat sink cooling is provided by three high capacity cooling fans All adjustments are factory preset and require no field adjust...

Page 12: ...Features and Specifications Section 2 Features and Specifications UHF 250 WATT POWER AMPLIFIER Version 3 2 1 07 18 01 ...

Page 13: ...250 Watt Power Amplifier Frequency Range 450 470 MHz Power Output 250 Watt RF Input Impedance 50 Ohm BNC Female RF Output Impedance 50 Ohms Type N Female Emission Designators F1D F3D F3E Duty Cycle 100 at full rated power Primary Power 26 28 VDC at 25 Amps Spurious and Harmonics 70 dBc or better Adjacent Channel Noise 70 dBc or better Operating Temperature 0ºc to 45ºc Full Power Operating Humidity...

Page 14: ...System Components Section 3 SYSTEM COMPONENTS UHF 250 WATT POWER AMPLIFIER Version 3 3 1 07 18 01 ...

Page 15: ...losure such that only the input and output R F coaxial connectors directly penetrate the enclosure All other penetrations are by filtered feed through which is designed for the R F environment A packaging view of the front and rear of the transmitter is shown in Figures 1 and 2 The power amplifier functional bock diagram is shown in Figure 3 FRONT VIEW Figure 1 Power Amplifier Unit Front Packaging...

Page 16: ...System Components REAR VIEW FUSE BOARD FINAL COMBINER SPLITTER DRIVER STAGE PREAMP LOW PASS FILTER HIGH POWER RF OUTPUT EXCITER RF INPUT Figure 2 Power Amplifier Rear View Version 3 3 3 07 18 01 ...

Page 17: ...ge Harminic Filter Directional Coupler Hi Temp Sensor RF OutPut DC Fuse Board Control Board Forward Reflected RF Power 1 3 VDC Bias Input RF Input 12 VDC Variable 12 VDC Power Sensor 12 VDC Power Bus Output RF Shielded Cage Figure 3 Power Amplifier Functional Block Diagram Version 3 3 4 07 18 01 ...

Page 18: ...mplifier configurations DC DC Converter FAN FAN P A R19 Power Adjust Clockwise Increases Notch Drive Stage Voltage Meter Calibration RF Input Calibration Forward Power Calibration Reflected Power Calibration Supply Voltage Meter Calibration Low power LED Power On LED High VSWR LED High Temp LED RF In LED PA Control Board Figure 4 Power Amplifier Control Board Version 3 3 5 07 18 01 ...

Page 19: ...tage that drives the P A pre amp to control the output power level of the P A b Bias supply generation for amplifier configurations requiring external bias c Monitoring of forward power reflected power temperature VSWR conditions D C power levels and various alarm conditions d Fan control and sensing e DC power regulation f Input power detection g P A keying and deactivation h Front panel Meter di...

Page 20: ...rnal voltmeter R33 Input RF Threshold Adjustment Sets the input RF level at which the fan circuit is activated R43 Forward Output Power Calibration Sets the gain between the forward power sensor and the input to the microprocessor Setting depends on frequency and power options and is factory preset This input is used to control the VSWR protection circuit R18 Input DC Voltage Meter Calibration Thi...

Page 21: ...System Components Version 3 3 8 07 18 01 Reset R23 R33 R43 R41 R18 R19 Figure 5 Transmitter Unit Power Amplifier Control Board ...

Page 22: ...ormal transmit condition When the output power is below this limit a fault indications provided i e low power but otherwise the amplifier operates normally This low power threshold is normally set in software to 50 of full rated power unless the customer makes a special request In addition to its normal control functions the Power Amplifier Control Board also contains all the drive circuitry for t...

Page 23: ...d on special high thermal performance board material and employ copper heat spreaders The output of the power transistor is fed into a low pass harmonic filter to eliminate unwanted harmonics The output of this harmonic filter also serves as the RF output connector mount and support The individual boards and preamp in the power amplifier are all fused on an independent basis This fuse board is als...

Page 24: ...lifier utilizes a very conservative and simplified design Like all of the EAGLE power amplifier designs the exciter output is fed directly through the heat sink and into the RF cavity on the back of the transmitter unit as shown in Figure 7 below M57729H Figure 7 Version 3 3 11 07 18 01 ...

Page 25: ...ed for a variety of purposes such as fan control and VSWR validation The driver stage is a hybrid module used to provide the required input power levels to the final stages of the amplifier It is a self contained module and is the final stage of the driver board Its output is connected to a network of three hybrid splitters used to provide one to four split Each output of the splitter drives the i...

Page 26: ...utput N connector of the amplifier The pre amp stage generates about 12 16 Watts The Pre amp RF power then passes through a dual splitter assembly to drive four final stages each is capable of generating up to 80 Watts to a total of 320 Watts of RF power This output is then passed through a dual combiner stage and then through a low pass filter to generate up to 250 watts of RF power The design of...

Page 27: ...s fuse board is utilized in all models of EAGLE power amplifiers up to 500 watts Therefore in the 250 watt version there are a number of unused fuse locations as shown in Figure 11 below LED Figure 11 Fuse Board Each of these fuse locations is instrumented with an LED to provide a quick visual indication of the health and status of that particular fuse Version 3 3 14 07 18 01 ...

Page 28: ...board and any of the slots can be used for the PA control board However the PA control board is usually installed in last slot on the left Also contained on the mother board is a regulator required to provide the 5 VDC supply to the PA control board and the display monitor A 12VDC variable regulator is also located at the motherboard to provide the drive voltage requirement for the pre amp Figure ...

Page 29: ... RMA number to return the unit 2 Verify that all cabling and DC power connections are in place If not tighten any screw or cables that may have come loose during shipment 3 Connect a known good Isolator Circulator to the RF output of the unit 4 Connect a known good dummy load to the output of the Isolator Circulator with a wattmeter in line between them 5 Connect the Power Amplifier unit to a corr...

Page 30: ...OFF at about 2 minutes and 20 seconds after the system is unkeyed 12 Check spurious and harmonics taken from the sampled output of the wattmeter on a Spectrum Analyzer These should be at least 65dBc 13 Un key the Exciter 14 Turn Power Off 15 Remove the dummy load Leave the Isolator Circulator and the wattmeter connected as before 16 Connect the antenna to the Isolator Circulator output through the...

Page 31: ...Appendices Section 4 Appendices UHF 250 Watt Power Amplifier Version 3 4 1 07 18 01 ...

Reviews:

No comments

Related manuals for UHF 250 WATT POWER AMPLIFIER

Brand: NAD Pages: 20

Brand: NAD Pages: 8

Brand: GAI-Tronics Pages: 24

NA-P 500 - AMPLIFIER

Brand: NAIM Pages: 15

Brand: NAIM Pages: 32

Brand: NAIM Pages: 24

Brand: NAIM Pages: 40

Brand: NAIM Pages: 32

Brand: TC Electronic Pages: 45

Brand: Fenton Pages: 20

Brand: ifi Pages: 33

Brand: Toa Pages: 1

Brand: Boston Pages: 22

Brand: JBL Pages: 8

Brand: NAD Pages: 33

Digital Technology XTDT3200

Brand: XTE Electronic Pages: 12

Brand: NXP Semiconductors Pages: 11

Brand: NAIM Pages: 12

Brands by name

0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Popular brands

Load more brands