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LPA50/LPA100

50/100W LINEAR POWER AMPLIFIER

System Manual

CA44–VER03

(Replaces CA44-VER02)

Technologies, Inc.

4050 NW 121st Avenue
Coral Springs, FL 33065
1–800–785–7274
www.pulsartech.com

Printed

June 2001

Summary of Contents for LPA100

Page 1: ...PA50 LPA100 50 100W LINEAR POWER AMPLIFIER System Manual CA44 VER03 Replaces CA44 VER02 Technologies Inc 4050 NW 121st Avenue Coral Springs FL 33065 1 800 785 7274 www pulsartech com Printed June 2001...

Page 3: ...l la at ti io on n T Te es st t E Eq qu ui ip pm me en nt t I In ni it ti ia al l A Ad dj ju us st tm me en nt t M Ma ai in nt te en na an nc ce e P Po ow we er r S Su up pp pl ly y M Mo od du ul le e...

Page 4: ...rs like the ones in the left margin on this page are next to important new information that may affect the operation of the LPA50 LPA100 Note also that in some cases text and graphics may have flowed...

Page 5: ...ricity You should observe electrostatic discharge precautions when handling modules or individual components PULSAR does not assume liability arising out of the application or use of any product or ci...

Page 6: ...dard warranty is 90 days or the remaining warranty time whichever is longer Damage clearly caused by improper appli cation repair or handling of the equipment will void the warranty Equipment Return R...

Page 7: ...ment initial adjustments and maintenance procedures respectively Module circuit descriptions and troubleshooting procedures are in Chapters 7 thru 10 Contents of LPA50 and LPA100 The LPA50 and LPA100...

Page 8: ...gram 3 6 4 1 Extender Board 4 2 5 1 LPA Front panels Test points 5 7 5 2 LPA50 Connection Diagram 5 8 5 3 LPA100 Connection Diagram 5 9 7 1 Power supply front panel 7 1 7 2 Power supply component layo...

Page 9: ...gth De Rating for Air Insulation 1 8 1 5 Altitude Correction For Maximum Temperature Of Cooling Air ANS C93 5 1 8 2 1 LPA50 LPA100 Catalog Numbers 2 2 2 2 LPA50 LPA100 Module and Chassis Style Numbers...

Page 10: ...Technologies Inc...

Page 11: ...fixed racks swing racks or open racks Rack contains one or more chassis e g the LPA 100 Chassis contains several printed circuit boards called modules e g Power Supply or Power Amplifier Module conta...

Page 12: ...W COMBINER 50W COMBINER POWER SUPPLY POWER INPUT OUTPUT 20V 20V COMMON POWER SUPPLY POWER INPUT OUTPUT 20V 20V COMMON 10W POWER AMP TRANSMIT INPUT LEVEL SET INPUT COMMON 10W POWER AMP TRANSMIT INPUT L...

Page 13: ...in Figure 1 1 At each end of the chassis is a Power Supply Module and two 12 5W Power Amplifier Modules Each Power Supply Module powers the two 12 5W Power Amplifier Modules closest to it This gives a...

Page 14: ...normal operation all of the 12 5W Power Amplifier Modules are putting out equal amplitude and in phase signals and there is almost zero loss in the combiner circuit As with the LPA50 each Power Suppl...

Page 15: ...Amplifiers plugged in Output impedance 50 with all four 12 5W Power Amplifiers plugged in Maximum power input 10 W 40 dBm 50 reference Minimum power input 10 mW 10 dBm 50 reference to get 50 W output...

Page 16: ...to get 100 W output Maximum power output 100 W continuous single frequency 47 dBm 50 reference Harmonic spurious output 55 dB below 100 W Overall power loss for failure of the 12 5W Power Amplifier s...

Page 17: ...able 1 5 of air contacting equipment Relative humidity Up to 95 non condensing at 40 C for 96 hours cumu lative Altitude Up to 1 500 m without derating Up to 6 000 m using Table 1 4 and Table 1 5 Tran...

Page 18: ...0 0 83 3 600 0 79 4 200 0 74 4 800 0 69 5 400 0 64 6 000 0 59 Table 1 4 Altitude Dielectric Strength De Rating for Air Insulation Temperatures Degrees C Altitude Meters Short Time Long Time Difference...

Page 19: ...tuner or hybrids F V out V in 600KHz TP6 Red J9 Output UHF Low Pass Filter Power Combiner J8 Input BNC 9 5dBm Input 41 3dBm 41 3dBm 47 0dBm 41 3dBm 41 3dBm 9 5dBm Input 9 5dBm Input 9 5dBm Input From...

Page 20: ...These coaxial cables and necessary adapters are provided loose with the 100W LPA 50W In 2 47 3 dBm 47 3 dBm 41 7 dBm 41 7 dBm 41 7 dBm 41 7 dBm 47 3 dBm 6 dBm Input J2 Input BNC 100 100 Com 12 5W PWR...

Page 21: ...loose with the 100W LPA J2 Input BNC 100 100 From J1 VHF output of driving Carrier set 12 5W PWR AMP 2 12 5W PWR AMP 4 12 5W PWR AMP 3 12 5W PWR AMP 1 TP4 Orange TP3 Yellow To Chasis 1 of 2 To Chasis...

Page 22: ...Technologies Inc Page 1 12 June 2001 50W 100W Linear Power Amplifier System Manual Technologies Inc USER NOTES...

Page 23: ...ying high power LPAs you must treat the following three types of systems differently Directional Comparison Blocking systems Phase Comparison Blocking systems Systems using frequency shift carrier set...

Page 24: ...requency shift carrier sets a Skewed Hybrid H1SB R or equivalent must be used between the output of the LPA and the input of the receiver to prevent intermodulation The RF Interface Module of the TCF...

Page 25: ...LPA50 LPA100 Chassis Assembly 1353D63G04 1 2 Cover Lexan cover LPA50 LPA100 Chassis 1606C49G01 1 2 Cables Interconnecting cables LPA100 Chassis N A 0 1 lot In addition to the catalog number identifyi...

Page 26: ...Technologies Inc Page 2 4 June 2001 50W 100W Linear Power Amplifier System Manual Technologies Inc USER NOTES...

Page 27: ...panel access to these potentiometers is covered with a label that also has the chassis serial number on it You should not switch these 12 5W PA modules between chassis without checking their levels a...

Page 28: ...Connections The LPA50 rear panel connections are shown in Figure 3 3 The LPA100 rear panel connections are shown in Figure 3 4 You can make all necessary connections to the LPA50 100 chassis via the...

Page 29: ...5 4 8 1 9 7 1 4 8 5 3 7 7 2 2 2 5 0 5 7 1 5 6 3 0 0 1 6 0 0 2 9 0 5 0 2 2 9 8 7 8 0 7 0 2 0 4 9 8 1 1 2 8 0 2 8 6 5 1 1 2 0 0 0 3 0 4 0 0 O P T I O N A L M O U N T I N G B R A C K E T L O C A T I O N...

Page 30: ...4 0 3 3 1 7 5 1 8 3 2 5 0 6 3 4 6 5 4 6 1 6 0 0 1 1 2 5 0 3 1 2 8 5 7 5 7 8 7 1 1 2 5 0 3 1 2 8 5 7 5 7 8 7 C L C L T a p p e d h o l e f o r 1 0 s c r e w o r 2 5 0 6 3 5 d i a m e t e r c l e a r a...

Page 31: ...CA20BKPMN 001 SCHEMATIC CA30BKPMN PC BOARD CA50BKPMN REV 01 GND DC IN DC IN POWER AMP ALARM POWER SUP ALARM 50 WATT AMPLIFIER WITH 50W COMBINER CHASSIS REAR VIEW INPUT FROM 10 W CARRIER DRIVING SET N...

Page 32: ...RM GROUND 50 WATT AMPLIFIER WITH 50W COMBINER CHASSIS 2 OF 2 INPUT FROM 10 W CARRIER DRIVING SET COAX T AND TWO CABLES BETWEEN CHASSIS ARE SUPPLIED WITH THE LPA100 SEE NOTE DC IN SEE NOTE DC IN POWER...

Page 33: ...EN HANDLING MODULES OR INDIVIDUAL COMPONENTS FAILURE TO OBSERVE THESE PRECAUTIONS CAN RESULT IN COMPONENT DAMAGE CAUTION High Impedance Selective Level Meter 300 Hz to 1 MHz 100W Rycom 6021A or A high...

Page 34: ...Page 4 2 June 2001 50W 100W Linear Power Amplifier System Manual Technologies Inc Figure 4 1 Extender Board...

Page 35: ...potentiometer on the driving carrier set s Power Amplifier module to minimum fully counterclock wise This will prevent it from overdriving the LPA when initially powered up 3 Turn on all the Power Su...

Page 36: ...between any one of the 50W Power Combiner s four input test points orange yellow blue white see Figure 5 1 and the input common test point black in order to verify that the levels are equal to one an...

Page 37: ...equal to one another and approximately 27 2Vrms 41 7 dBm 50 reference If not then go to the calibration troubleshooting procedure in Section 5 2 for instructions on adjusting the individual 12 5W Powe...

Page 38: ...ed on the input test points of the 50W Power Combiner module Measure between any one of the four Power Combiner input test points orange yellow blue white see Figure 5 1 and the input common test poin...

Page 39: ...ower Combiner modules balance resistors will heat up which is normal since only part of the Power Amplifier modules would be energized causing imbalance in the Power Combiner module This heating will...

Page 40: ...e 50W Power Combiner NOTE Be careful to not let the test points short together since they are physically close together 8 On the 100W Power Combiner module in chassis 1 of 2 measure between each of th...

Page 41: ...R INPUT OUTPUT 20V 20V COMMON POWER SUPPLY POWER INPUT OUTPUT 20V 20V COMMON 10W POWER AMP TRANSMIT INPUT LEVEL SET INPUT COMMON 10W POWER AMP TRANSMIT INPUT LEVEL SET INPUT COMMON 10W POWER AMP TRANS...

Page 42: ...CA20BKPMN 001 SCHEMATIC CA30BKPMN PC BOARD CA50BKPMN REV 01 GND DC IN DC IN POWER AMP ALARM POWER SUP ALARM 50 WATT AMPLIFIER WITH 50W COMBINER CHASSIS REAR VIEW INPUT FROM 10 W CARRIER DRIVING SET NO...

Page 43: ...COMBINER CHASSIS 2 OF 2 INPUT FROM 10 W CARRIER DRIVING SET COAX T AND TWO CABLES BETWEEN CHASSIS ARE SUPPLIED WITH THE LPA100 SEE NOTE DC IN SEE NOTE DC IN POWER AMP ALARM POWER SUP ALARM FOR REDUND...

Page 44: ...Page 5 10 June 2001 50W 100W Linear Power Amplifier System Manual Technologies Inc Technologies Inc USER NOTES...

Page 45: ...metering circuit be sure that The lead marked touches the diode anode opposite striped end The lead marked touches the diode cathode striped end 3 When checking circuits with an oscillographic probe...

Page 46: ...g or removing components or circuits 2 Before placing new components into a defective circuit check the circuit so that it cannot damage the new components 6 5 2 Trouble Detection Sequence 1 Evaluate...

Page 47: ...diode or other device make certain that the device and the heat sink make secure contact for good heat dissipation Mount a device first on the heat sink and then on the board Also make sure that you...

Page 48: ...Technologies Inc Page 6 4 June 2001 50W 100W Linear Power Amplifier System Manual Technologies Inc USER NOTES...

Page 49: ...l controls are as follows 1 Push button Switch with power on indicator ON OFF S1 2 LEDs for indicating power INPUT Red LED1 OUTPUT Red LED2 3 Test Jacks 20 Vdc Red TP3 Common Green TP2 20 Vdc Black TP...

Page 50: ...Figure 7 2 LPA50 LPA100 Power Supply Component Location 1617C38...

Page 51: ...itching noise is outside the 30 535 kHz range of the TC 10B TCF 10B The converter outputs 20 Vdc and 20 Vdc is fed to the output filter See Figure 7 3 Output Filter The output filter for the 20 V cons...

Page 52: ...Figure 7 3 LPA50 LPA100 Power Supply Schematic 1617C39...

Page 53: ...s shown in Figure 8 1 Operator controls are as Described below Potentiometer R53 INPUT LEVEL SET Adjusts power output level to 10 W with 1 mW input LED TRANSMIT RF Power Indication Red D6 Test Jacks I...

Page 54: ...and R23 The overall no load voltage gain is approximately 282 The overall loaded voltage gain is approximately 141 The partial loaded gain between C28 A28 and the primary of T1 is approximately 38 Th...

Page 55: ...Figure 8 2 LPA50 LPA100 12 5W PA PC Board 1495B73 8...

Page 56: ...Figure 8 3 12 5W PA Schematic 1606C33...

Page 57: ...ge resistors on this module In normal operation all of the 12 5W Power Amplifier modules are putting out equal amplitude in phase signals and there is almost zero loss in the combiner circuit If all t...

Page 58: ...tuner 9 2 2 In service checks Read between the red and black test points 50W output on the 50W Power Combiner module see Fig 9 1 The level should be at 50Vrms 1V 47 0 dBm 0 3dB 50 reference which is e...

Page 59: ...le Component Layout 9 PULSAR TECHNOLOGIES INC COMBINER MODULE CA20 CMBMN REV GND ______WATT A2 C2 D1 D2 T3 T4 T2 T1 C3 C1 C2 C4 C5 C7 C8 C6 G1 R1 R3 R2 R4 J2 J3 J4 J5 J6 J7 J8 TP1 TP2 TP3 TP4 TP5 TP6...

Page 60: ...J7 J8 25 OHM J6 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 100 R3 200 R4 T4 T3 100 R1 50 R2 T2 P1 P1 TP3 TP5 TP2 2 5 8 2 5 8 5W 5W A10 C10 A14 C14 C18 A18 A30 C30 C22 A22 C26 A26 10W 100 10W YELLOW BLUE WHITE TP4...

Page 61: ...mbiner circuit If all the Power Supply modules are not turned on within a few minutes of one another the Power Combiner module balance resistors will heat up This is normal since only part of the Powe...

Page 62: ...e 50W output of external chassis and the common test jack black These two levels should be equal to one another and approximately at 51 8Vrms 47 3 dBm 50 reference These input test points on the 100W...

Page 63: ...dule Component Layout 10 PULSAR TECHNOLOGIES INC COMBINER MODULE CA20 CMBMN REV GND ______WATT A2 C2 D1 D2 T3 T4 T2 T1 C3 C1 C2 C4 C5 C7 C8 C6 G1 R2 R4 J2 J3 J4 J5 J6 J7 J8 R1 R2 TP1 TP2 TP3 TP4 TP5 T...

Page 64: ...25 OHM J7 J8 25 OHM J6 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 100 R3 200 R4 T4 T3 100 R1 50 R2 T2 P1 P1 TP3 TP5 TP2 2 5 8 2 5 8 5W 5W A10 C10 A14 C14 C18 A18 A30 C30 C22 A22 C26 A26 10W 100 10W YELLOW BLUE WH...

Page 65: ......

Page 66: ...Technologies Inc...

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