PA 150 Amplifier Operation and Maintenance Manual

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1 Eclipse Series RF Technology February, PA Amplifier Operation and Maintenance Manual This manual is produced by RF Technology Pty Ltd / Leighton Place, Hornsby NSW Australia. Copyright RF Technology.

2 CONTENTS CONTENTS Contents Operating Instructions. Front Panel Indicators. Internal Adjustments. Output Power.4 RF Level Detector Circuit Description 4. Amplifiers 4. Power Splitter/Combiners. Directional Coupler.4 Low pass Filter. Power Control Circuits. RF Output Indicator. Over Temperature Protection Alignment Procedure 4 Specifications 4. Description 4. Physical Configuration 4. Front Indicators and Test Points 4.. Indicators 4.. Test Points Electrical Specifications. Power Requirements. Frequency Range. Nominal Antenna Impedance.4 Output Power. Transmit Duty Cycle. Spurious and Harmonics. Maximum Heatsink Temperature. ALC Output. Mis-Match Protection Conectors. Antenna Connector. Power and I/O Connector. Test Connector Appendix A Block Diagram Schematic Diagram Board Layout Parts List RF Technology PA Page

3 OPERATING INSTRUCTIONS WARNING Changes or modifications not expressly approved by RF Technology could void your authority to operate this equipment. Specifications may vary from those given in this document in accordance with requirements of local authorities. RF Technology equipment is subject to continual improvement and RF Technology reserve the right to change performance and specification without further notice. Operating Instructions. Front Panel Indicators PWR LED The Power LED shows that the dc supply is connected to the transmitter. RFO LED The RF Output LED indicates that the amplifier is being driven and that the forward output power is above a preset level. The indication level is set by RV which is accessible through the side of the case. (After removing screws) TEMP LED The Temperature LED indicates when the amplifier temperature is too high. The power is automatically reduced if the output transistors temperature rises above safe limits.. Internal Adjustments All internal adjustments are factory set and should not need readjustment under normal conditions.. Output Power The output power is set to the desired level watts by RV. It determines the threshold of the ALC voltage which is fed back to the transmitter module to regulate the power. The output power of standard amplifiers can be set to any level between and watts. The high power versions with H suffix model numbers can be set between and watts. RF Technology PA Page

4 CIRCUIT DESCRIPTION.4 RF Level Detector The RF Detector threshold for the RFO LED on the amplifier front panel is set by RV. This is normally set at half the rated output power. WARNING Ensure that the output power setting complies with the equipment s licence requirements. Failure to do so may result in penalties being imposed by the licensing authority. Pin Connector PA Amplifier I/O Connections Function/Signal Pins Specification DC Power +Vdc,,4, +.4 to Vdc - Vdc,,4, ALC Output Approx Vdc decreasing with increasing power or temperature RF Input Watts max BNC Connector RF Output N Connector Watts Max Circuit Description The following descriptions should be read as an aid to understanding the block and schematic diagrams at the rear of this manual.. Amplifiers The RF power amplification is provided by one or two transistors, Q4 and Q. The standard power version uses one transistor (Q4) and the high power version uses two. Each transistor is rated at watts output. The input and output impedances of the transistors are matched to O by microstrip matching networks. RF Technology PA Page 4

5 CIRCUIT DESCRIPTION The amplifiers are broad band and do not have any tuning adjustments. The A versions are optimized for the frequency range - MHz while the B versions cover 4-4 MHz. The dc supply is fed to the amplifiers through resistors R and R. This allows the collector current of each amplifier to be measured at the test socket.. Power Splitter/Combiners The high power versions use zero degree power splitters and combiners. They consist of lumped element /4 wave O pi networks and O RF resistors (C4-, L-, R-). This configuration provides wider bandwidth and better balance than lower cost degree hybrids.. Directional Coupler The forward and reverse power components are measured throug a coupled line directional coupler. The output of the coupled line is frequency compensated by R-4 and C- before being detected by D and D. The voltage output of the detectors is proportional to the forward and reflected power..4 Low Pass Filter A low pass filter consisting of L- and C-4 reduces the harmonic components to less than -dbc. The filter uses a combination of lumped elements and printed microstrips to obtain the required harmonic attenuation.. Power Control Circuits The forward and reverse voltages from the directional coupler are amplified and inverted by Ua and Ub. The amplified voltages are combined before connecting to the input of error amplifier Ud. Error amplifier Ud compares the detected voltage with the dc reference voltage from output power trimpot RV. The amplified difference at the output Ud is supplied to the rear panel system connector for connection to the T ALC input.. RF Output Indicator The forward power voltage is compared with the pre-set dc reference voltage from RV and Uc. The output of Uc is used to turn on the RFO LED and provide an output power logic signal to the test connector. RF Technology PA Page

6 ALIGNMENT PROCEDURE RV is normally set so that the RFO LED comes ON at - db below the normal power output.. Over Temperature Protection Thermistor RT is mounted to the case of output transistor Q4. If the transistor case temperature rises above degrees C the resistance of RT increases and Q is turned ON. This causes the TEMP LED to come on and also reduces the dc reference voltage to the output power error amplifier Ud. The input power will then be reduced by the transmitter ALC circuits and the output transistors are kept within safe operating limits. Alignment Procedure The following procedures may be used to align the amplifier for optimum performance. Standard Test Conditions RF Input Source Power Supply Load T Series transmitter. Vdc at A O watts watts maximum VSWR <.: Set RFO Level Step Input Measure Adjust None Set RV and R Fully counter clockwise Centre channel frequency from the T, W max threshold RF output power at J Key transmitter adjust RV for desired output As above RFO LED Key transmitter adjust RV to where the RFO LED just goes OFF RF Technology PA Page

7 4 SPECIFICATIONS Set Output Power Step Input Measure Adjust 4 As above RF output power at J Key transmitter. Adjust RV for the desired power 4 Specifications 4. Description The power amplifiers are designed for use with the T series transmitters to provide - watts output. Output power regulation is provided by connecting the output of the directional coupler to the ALC input of the T. the drive from the transmitter is then automatically adjusted to maintain the required output. The regulated power level can be preset over a wide range from to watts depending on the available driver power. Sensing circuits are provided to protect the output transistors from excessive temperatures. If the output transistor case temperature rises to degrees C, the input drive will be reduced to prevent damage. 4. Physical Configuration The power amplifier is designed to fit in a inch rack mounted frame. The installed height is 4RU (mm) and the depth is mm. The amplifier is.mm or three Elcipse modules wide. An extruded aluminium heat sink with vertical fins is used. The temperature rise is normally less than degrees at watts output. 4. Front Indicators and Test Points 4.. Indicators Power ON - Green LED RF Power Output - Yellow LED Over Temperature - Red LED RF Technology PA Page

8 ELECTRICAL SPECIFICATIONS 4.. Test Points (DB Connector) Forward Power Pin + Gnd (pin ) Reverse Power Pin 4 + Gnd (pin ) Collector Current Pin, Pin + Vcc.Vdc Electrical Specifications. Power Requirements Operating Voltage -. to Vdc with output power reduced below. Vdc. Current Vdc - Amps Max at watts. ma Max standby Polarity - Negative Ground. Frequency Range Frequency Watt Watt -MHz PAA PAAH 4-4 MHz PAB PABH. Nominal Antenna Impedance O.4 Output Power to watts adjustable. Transmit Duty Cycle With Free Air Circulation Watts - % to 4 deg. C Watts - % to 4 deg. C With Fan Module - Watts - % to deg. C. Spurious and Harmonics Less than.uw RF Technology PA Page

9 Connectors. Maximum Heatsink Temperature degrees C.. ALC Output The ALC is intended for connection to the T. It supplies a voltage which decreases with increasing power or temperature.. Mis-Match Protection The amplifier is protected from damage when operating into a VSWR of / at all phase angles. Connectors. Antenna Connector Type N Female mounted on the module rear panel. Power and I/O Connector pin D Male mounted on the rear panel. Test Connector pin D Female mounted on the front panel. RF Technology PA Page

10 RF Technology PA Page

11 -W OU T PU T 4 B A +. V dc D U REF. REG. RV POWER ADJU ST V.REF. REV.PWR. FWD. & REV. DET ECT OR AMPS. U A D Q D AL C OU T U D AL C AMP U B RT DEG.C. t OV ER T EMP. DET ECT OR FWD.PWR. V.REF. C OV ER T EMP. Q R.F.DET. U C RV SET DET ECT L EV EL T EMP. R.F.DET. C -W INPU T SPL IT T ER Q COMB INER C4-4,L, C4-,L, L,R L,R B + * W V ERSIONS + Q4 DIRECT IONAL COU PL ER D,D MHz L PF C-C4 L -L W AMPLIFIERS * -W V ERSIONS U SE SINGL E AMPL IFER ( Q4 ) A T itle R.F.T ECHNOL OGY PT Y. L T D. /L eighton Place, HORNSB Y, AU ST RAL IA Size B y: Number Revision A4 B L OCK SIGNAL FL OW DIAGRAM / R Date: -Oct- Sheet of File: D:\RFT _MasterFiles\..\-VHFPA-block.sch Drawn 4

12 4 J BNC INPUT J NType OUT PUT D D L E D PCB ASSY / PWR AL C T E MP D D D AMPL IFIE R PCB ASSY / C J 4 V I ca I cb RF.DET. OV ER T EMP. FWD.PWR. REV.PWR. +. CONNE CT OR DB P JBS after RH M P 4 +. J B J P 4 J P A.L.C. R4 4 V A T itle RF T E CH NOL OGY PT Y. L T D. /L eighton PL ace, H ORNSB Y,, Austr alia CONNE CT OR DB Size Number Revision (VH F AMPL IFIE R) OrcadA Date: -Aug- Sheet of File: D:\RFT _MasterFiles\..\-block.sch Drawn By: 4 J 4 4 P4 4 4 C B A

13 B PA PARTS LIST Ref. Description Part Number NOTE - ALL COMPONENTS FOR WHICH REF IS ACCOMPANIED WITH AN ASTERIX (*) ARE USED ONLY IN HIGH POWER MODELS (PAXH) C CAP N % V XR RAD. 4//N C CAP 4N % 4V MKT RAD. 4/4/4N C CAP U V RAD ELECTRO 4//U C4 CAP N % V XR RAD. 4//N C CAP % V NPO SM 4// C CAP % V NPO SM 4// C CAP N % V XR RAD. 4//N C CAP N % V XR RAD. 4//N C4 CAP.U % V SOLID AL 4//U C CAP N % V XR RAD. 4//N C CAP N % V XR 4//N C CAP V MICA SM 4// C CAP V MICA SM 4// C* CAP.U % V SOLID AL 4//U C* CAP N % V XR RAD. 4//N C* CAP N % V XR 4//N C* CAP V MICA SM 4// C* CAP V MICA SM 4// C4* CAP V MICA SM 4// C44* CAP V MICA SM 4// C4* CAP V MICA SM 4// C4* CAP V MICA SM 4// C4* CAP V MICA SM 4// C4* CAP V MICA SM 4// C4* CAP V MICA SM 4// C* CAP V MICA SM 4// C CAP P % V NPO SM 4//P C CAP P % V NPO SM 4//P C CAP % V NPO SM 4// C4 CAP % V NPO SM 4// C CAP % V NPO RAD. 4// C CAP % V NPO RAD. 4// C CAP % V NPO RAD. 4// C CAP % V NPO RAD. 4// C CAP % V NPO RAD. 4// C CAP % V NPO RAD. 4// C CAP % V NPO RAD. 4// D DIODE SHTKY BAT SOT // D DIODE SILICON N44 //44 D DIODE SHTKY BAT SOT // L IND U % CHOKE SM //U L INDUCTOR UH AXIAL //U L FERRITE BEAD x4x 4S // L4 COIL AIR COR T.P.ID // L IND MOLDED. TURN // L IND MOLDED. TURN // L* INDUCTOR UH AXIAL //U L* FERRITE BEAD x4x4s // RF Technology PA Page

14 B PA PARTS LIST Ref. Description Part Number L* COIL AIR CORE T.P.ID // L* IND MOLDED. TURN // L* IND MOLDED. TURN // L COIL AIR CORE T P.ID /4/ L COIL AIR CORE T P.ID /4/ L4 COIL AIR CORE T P.ID // L COIL AIR CORE T P.ID // L COIL AIR CORE T P.ID // L INDUCTOR, MOULDED.T // L INDUCTOR, MOULDED.T // L* COIL AIR CORE T.P 4D /4/ L* COIL AIR CORE T.P 4D /4/ P.mm QC TAB VERT PCB MT // P.mm QC TAB VERT PCB MT // P4 CON WAY SHR'D HEADER // Q TRSTR GP PNP N TO // Q TRSTR GP NPN N4 TO //4 Q TRSTR GP NPN N4 TO //4 Q4 TRSTR NPN VHF RF MRF4 //MRF4 Q* TRSTR NPN VHF RF MRF4 //MRF4 R RES %.W SM // R RES %.W SM // R RES %.W SM // R4 RES %.W SM // R RES 4K %.W AXIAL /4/4K R RES K %.W AXIAL /4/K R RES K %.W AXIAL /4/K R RES 4K %.W AXIAL /4/4K R RES K %.W AXIAL /4/K R RES K %.W AXIAL /4/K R RES %.W AXIAL /4/ R RES M %.W AXIAL /4/M R RES K %.W AXIAL /4/K R4 RES %.W AXIAL /4/ R RES %.W AXIAL /4/ R RES K %.W AXIAL /4/K R RES %.W AXIAL /4/ R RES %.W AXIAL /4/K R* RES OHM 4W RF /RF4/ R* RES OHM 4W RF /RF4/ R RES. % W ASW //R R* RES. % W ASW //R R RES %.W AXIAL /4/ R4 RES %.W AXIAL /4/ R RES %.W AXIAL /4/ R RES %.W AXIAL /4/ R RES %.W AXIAL /4/ R RES %.W AXIAL /4/ R RES %.W AXIAL /4/ R RES 4K %.W AXIAL /4/4K R RES K %.W AXIAL /4/K RF Technology PA Page

15 B PA Parts List Ref Description Part Number R RES K %.W AXIAL /4/K R4 RES % W AXIAL // R RES %.W AXIAL /4/ R RES %.W AXIAL /4/ R RES % W AXIAL // R* RES % W AXIAL // R* RES %.W AXIAL /4/ R4* RES %.W AXIAL /4/ R4* RES % W AXIAL // R4* RES R % W AXIAL // R4 RES R % W AXIAL // R(P) RES %.W AXIAL /4/ RT THERMISTOR 4/4/ RV TRIMPOT TURN VERT // RV TRIMPOT TURN VERT // U IC VOLT REG L TO M /4/L U IC QUAD OP AMP TLC4 //4C PAA - MHz Parts These parts fitted to PAA & AH C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C4 CAP P V MICA SM 4//P C4 CAP P V MICA SM 4//P C4 CAP V MICA SM 4// These additional parts used on PAAH ONLY C4* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C4* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P RF Technology PA Page

16 B PA Parts List Ref Description Part Number PAB 4-4 MHz Parts These parts fitted to PAB & BH C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C4 CAP P V MICA SM 4//P C4 CAP P V MICA SM 4//P C4 CAP P V MICA SM 4//P These additional parts used on PABH ONLY C CAP P V MICA SM 4//P C4* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C4* CAP P V MICA SM 4//P C* CAP P V MCA SM 4//P C* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P C* CAP P V MICA SM 4//P End parts list RF Technology PA Page 4

17 4 F E D C B A V+ GND -W INPUT J P P P RT Vo R44 R4 K P4 4 4 R U4 LM R4 t C +. TP R TP +.B R R4 R4 K 4 C SPLITTER TEMP. LED RF LED DC LED C C UA TLC4 C4 IC B IC A RF DET. OVER TEMP. FWD.PWR. REV.PWR. R R R R K Q 4 NOT USED IN / WATT VERSIONS (SUFFIX -H DESIGNATION) C4 C4 UB TLC4 R4 L L D4 N4 Q R +. TP +. D *N44 D *N44 C44 C A Q N R R J FAN R * R IC B IC A C4 *P C *P R TEMP. LED OVER TEMP. RF DET. RF LED L U C *P L U C *P R4 C Q N4 C *P C *P +. C U + D N44 C *P L R C *P LML U VI R R GND C Q MRF4 R4 R L R4 C R4 N C *P R4 R C *P R4 R UC TLC4 L L C C4 *P C N R4 Q4 MRF4 C *P VO C *P C *P C N RV RV UD TLC4 4 C 4N L N L4 C P C P R M C C COMBINER L AH model high-end low output power fix Rev No. ECO No. Description of Change W AMPLIFIER, VHF -4 MHZ D:\Protel Files\Master_EDA\_PAVHF_FAN\.ddb - Documents\RV.sch 4 R C *P C *P R 4K R R L C *P REV.PWR. C N C L C *P C FWD.PWR. C N C N +.B C +.A C R K R K R K R K + C U + C4 U * VALUES ARE FOR 4-4 MHz (SUFFIX -B MODELS) C/C MAY BE FITTED ON SOME MODELS * -4MHz C C4 C C C C C C C C C C4 C C C C C C C C4 C4 C4 C C (SUFFIX -A MODELS) P P P P P P P P P P P NF (SUFFIX -AH MODELS) NF P NF P C4 N R UB TLC4 R K R K R UA TLC4 R4 R4 NF C4 L C4 File: 4 Title R 4K C C4 P C N D BAT C4 C L L4 R4 C C P C C P R R 4K L C4 C P R L U C4 P LOW PASS FILTER Add fan control circuit D BAT R L DIRECTIONAL COUPLER L C4 P Size: A Number: / R Sheet Revision: Print Date: -Dec-4 Design Revision: Sheet of Rev. Release Date: Originator: 4 UD TLC4 J R K UC TLC4 -W OUTPUT RF Technology Pty Ltd Unit, Leighton Place Hornsby, NSW Australia F E D C B A

18 4 F E D C B A V+ GND -W INPUT J P P P RT Vo R44 R4 K P4 4 4 R U4 LM R4 t C +. TP TP R +.B R R4 R4 K 4 C SPLITTER TEMP. LED RF LED DC LED C C UA TLC4 C4 IC B IC A RF DET. OVER TEMP. FWD.PWR. REV.PWR. R R K Q 4 NOT USED IN / WATT VERSIONS (SUFFIX -H DESIGNATION) L C4 L C4 R R UB TLC4 R4 D4 N4 Q R +. TP +. D *N44 D *N44 C44 C A Q N R R J FAN R * R IC B IC A C4 *P C *P R TEMP. LED OVER TEMP. RF DET. RF LED L U R4 C *P(not fit in BH) L U C *P(not fit in BH) C Q N4 C *P C *P +. C U D N44 L ** + R ** LML U VI R R GND C Q MRF4 Q4 MRF4 R4 R ** L R4 C R4 **N ** R4 R R4 R C *P C *P L * VALUES ARE FOR 4-4 MHz -4MHz (SUFFIX -A MODELS) (SUFFIX -AH MODELS) UC TLC4 L ** C R4 ** VO C4 C C *P *P *P(P for BH model) C **N C C C *P *P *P(P fo BH model) (SUFFIX -B MODELS) C C4 C C C C C C C C P P P P P NF C N RV C C4 P P RV UD TLC4 4 L N C N C ***P L4 C ***P R K C C C C P COMBINER AH model high-end low output power fix Rev No. ECO No. Description of Change W AMPLIFIER, VHF -4 MHZ D:\Protel Files\Master_EDA\_PAVHF_FAN\.ddb - Documents\RV.sch 4 R C *P C *P C C P ** THESE COMPONENTS ARE NOT FITTED ON PABH (W) MODELS *** C/C ARE NOT FITTED ON W MODELS NF R 4K R R L C *P REV.PWR. C N C L C *P C C P C FWD.PWR. C N C N C C4 P +.B C +.A C C4 R K R R + C U + C4 U P K R K K C4 N C4 R C C NF P R UB TLC4 K R K R UA TLC4 R4 R4 NF L C4 L C4 File: 4 Title 4K C L C4 P R C N D BAT C4 C L4 R4 C C P C C P R L R 4K C4 C P L U LOW PASS FILTER Add fan control circuit DIRECTIONAL COUPLER Size: A Number: / R Sheet Revision: Print Date: -Feb- Design Revision: Sheet of Rev. Release Date: Originator: R C4 P D BAT R L L reduce ALC loop gain: R to K, Cto N 4 mismatch fix for new pcb 4 UD TLC4 C4 P J R K UC TLC4 -W OUTPUT RF Technology Pty Ltd Unit, Leighton Place Hornsby, NSW Australia F E D C B A

PA70 Amplifier Operation and Maintenance Manual

Eclipse Series RF Technology rfinfo@rftechnology.com.au January, 2004 PA70 Amplifier Operation and Maintenance Manual This manual is produced by RF Technology Pty Ltd 10/8 Leighton Place, Hornsby NSW 2077