RF Technology Pa50 Eclipse Series Operation And Maintenance Manual

Eclipse Series

RF Technology

[e-mail]

October 2003 Revision 2

PA50 Amplifier

Operation and Maintenance Manual

This manual is produced by RF Technology Pty Ltd

10/8 Leighton Place, Hornsby NSW 2077 Australia

Copyright © 2001 RF Technology

Page 2 RF Technology PA50

CONTENTS CONTENTS

Contents

1 Operating Instructions 3

1.2 Front Panel Indicators 3

2 Internal Adjustments 3

3 Test Points 4

4 I/O Connections 4

5 Circuit Description 5

5.1 Driver Stage 5

5.2 Output Stage 5

5.3 Low Pass Filter 5

5.4 Bias Supply 5

5.5 Reflectometer 6

5.6 Metering Circuits 6

6 Specifications 7

6.1 Physical Configuration 7

6.2 Indicators and Test Points 7

6.3 Electrical Specifications 7

6.3.1 Power Requirements 7

A Engineers Drawings 9

B Parts List 10

RF Technology PA50 Page 3

1 OPERATING INSTRUCTIONS

1 Operating Instructions

The PA50 is part of the Eclipse range of modular base station equipment. It is a power
amplifier capable of delivering 120 Watts in the VHF frequency range. It is designed
to complement the T50 transmitter, and mounts in a standard Eclipse sub-rack.

1.2 Front Panel Indicators

PWR LED Power LED indicates that the PA50 is connected to a DC power source.

RFO LED RF Output LED indicates that the PA50 is being driven by the exciter

and RF Output is available at the antenna socket.

TEMP LED Temperature LED indicates that the output transistors are above 90

degrees. This is only an indication and not an alarm condition as the
exciter monitors the PA50 temperature at all times in order to keep
within safe operating limits.

2 Internal Adjustments

All internal adjustments are factory set and should not need to be changed under
normal conditions.

R238 Driver bias adjustment
R239 O/P Q101 bias adjustment
R240 O/P Q100 bias adjustment
R227 Forward power meter adjustment
R228 Reverse power meter adjustment
C209 Reflectometer balance adjustment

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

a

uthorities. RF Technology equipment is subject to

continual improvement and RF Technology reserves the

right to change performance and specification without

further notice.

Page 4 RF Technology PA50

3 Test Points 1 OPERATING INSTRUCTIONS

3 Test Points

These test points are provided on the PCB and the DB9 front panel connector for use
by maintenance personnel

TP100 and TP101 Driver drain current measurement. A multimeter placed across

these pins will indicate 1 volt for 1 amp of Q102 drain current

TP102 and TP103 O/P stage drain current measurement. A multimeter placed

across these pins will indicate 1 volt for 10 amps of Q100 and
Q101 drain current

TP200 PA Temperature reading. 1 volt indicates a temperature of 40

degrees. This reading deviates by 10mV per degree of change

TP203 Reverse voltage output from the reflectometer

TP204 Forward voltage output from the reflectometer

DB9 pin 1 GND
DB9 pin 2 O/P drain current
DB9 pin 3
DB9 pin 4 Reverse voltage
DB9 pin 5 +28V
DB9 pin 6 Driver drain current
DB9 pin 7
DB9 pin 8 Forward voltage
DB9 pin 9

4 I/O Connections

There are 3 I/O connectors on the rear panel with the following functions

25 pin connector DC power and exciter logic interface
Pin 1 2 3 4 14 15 16 17 GND
Pin 10 11 12 13 22 23 24 25 +28V
Pin 7 DATA-IO
Pin 19 CLK
Pin 20 CS
Pin 18 VREFB
Pin 6 Forward Volts
Pin 8 Reverse Volts
Pin 21 Temperature

BNC Connector: RF Input from exciter approximately1 Watt

N Connector: RF Output to antenna, up to 150 Watts

RF Technology PA50 Page 5

5 CIRCUIT DESCRIPTION 5.1 Driver Stage

5 Circuit Description

The following descriptions should be read as an aid to understanding the block and
schematic diagrams.

5.1 Driver Stage

The function of the driver stage is to transform the RF input signal from the exciter to
the appropriate levels and impedance required by the output stage. The RF input signal
is applied to the high pass filter ( C121, C130, C131, C132, C133, L102 and L106 ).
This filter suppresses any residual low frequency spurious that may be present at the
exciter output. T100 is used to transform the nominal 50 ohm output from the exciter
to match the input of Q102. A negative feedback network ( C120, R130, R132,
R131, R133, R125, R129, L107 and R124 ) is used to achieve a reasonably flat gain
across the frequency of operation and to match the drive level requirements of the
PA50 to the output level provided by the exciter. DC bias is applied to the gate of
Q102 via R120 and R121 and is decoupled by C106 and C116. The DC feed for Q102
drain is decoupled by L100, C112, C102, C100 and C118. T101 is used for impedance
matching between the driver and output stage and to provide a balanced feed for the
push-pull output stage

5.2 Output Stage

The output stage amplifies the 5 – 10 W from the driver to in excess of 150 W for final
delivery into the low pass filter. Q100 and 101 are driven in push-pull configuration
by the outputs of T101. L105, R126, C126 and L104 R127 C127 form negative
feedback paths in order to achieve a reasonably flat frequency response across the
frequency of operation. T102 is used to provide the DC feed via the centre tap in the
primary winding to Q100 and Q101. T102 also combines the balanced output of the
transistors into a single ended output as well as provide the necessary impedance
transformation from the transistors into a nominal 50 ohms. A small DC bias is
applied to the gates of Q100 and Q102 via R118, 119, 122 and 123 and decoupled by
C103, 113, 107 and 117. The DC feed to the transformer is decoupled by L103, L101,
C101, 119, 104, 114, 105, 115 and 128.

5.3 Low Pass Filter

The low pass filter attenuates spurious emissions to less than –86dBc.

5.4 Bias Supply

The function of the bias supplies is to provide a temperature compensated bias voltage
to the gates of Q100 Q101 and Q102 for adjustment to their quiescent currents. U205
and R213, R214 and R215 provide the bias voltages. U200D provides a decreasing
output voltage with increasing temperature. The resistive dividers R214, R229 and

Page 6 RF Technology PA50

5.5 Reflectometer 5 CIRCUIT DESCRIPTION

R213, R230 and R208, R215 provide the bias voltage to the transistors so that
quiescent current is maintained across the operating temperature range.

5.5 Reflectometer

The reflectometer provides an indication of load mismatch. A200 is a current
transformer with a single turn primary being passed through the centre of a toroid. The
multiturn secondary has an output voltage that is proportional to the current flowing in
the primary. The voltages appearing at the anodes of D205 and D206 are of equal
amplitude and opposite phase. A sample of the line voltage is applied to the junction
of the divider resistors R218 and R220. C209 is adjusted for equal amplitude with the
transformer. Since the transformer has 180 degree phase shifted outputs the
application of the line voltage will cause cancellation at D205 and addition at D206.
This phase relationship will change when a mismatch occurs resulting in an increase in
the voltage at D205. D205 and D206 rectify these voltages so that a DC level
proportional to the forward and reflected voltages are available for the metering
circuits. L200 provides a DC reference point for the diodes.

5.6 Metering Circuits

These circuits are included so that the exciter can interrogate the PA and read all the
vital operating levels. U203 is an A to D converter with the following inputs:

Reverse voltage
Forward voltage
Temperature
DC Input volts
O/P drain current
Driver drain current
Q100 bias voltage
Q101 bias voltage
Model identification jumpers

Forward and reverse voltages are supplied from the reflectometer outputs and factory
set to the correct levels by R227 and R228. U204 ( temperature sensor ) is mounted on
the same pad as the source lead of Q101 to provide a temperature reading of the O/P
transistor cases. DC Power Input voltage is provided by a resistive divider (R3 and
R4). The O/P drain current is provided by measuring the small voltage drop across
R113 and R128. Driver drain current is provided by measuring the small voltage drop
across R112 and R138. The bias voltages are read directly from the bias supplies. The
model identification is determined by the jumper settings of J203, 204 and 205.

PA50A 25 – 32 MHz J203 on, J204 and J205 off
PA50B 30 – 40 MHz J204 on, J203 and J205 off
PA50C 38 – 50 MHz J205 on, J203 and J204 off

U202 and associated components provide a 3 wire serial interface to allow the exciter
to interrogate the A to D converter. U200C is a comparator that switches the fan on

RF Technology PA50 Page 7

6 SPECIFICATIONS 6.1 Physical Configuration

when the temperature rises above 40 degrees C. U201D is a comparator that switches
the TEMP LED on when the temperature rises above 90 degrees C. Q203 samples the
line output RF voltage to turn on the RFO LED.

6 Specifications

The PA50 is designed for use with the T50 exciter to provide 20 to 150 Watts output.
Output power regulation is performed by the exciter as it continually monitors PA
performance. The exciter also monitors important levels such as temperature reverse
power and drain currents to keep them within operating limits.

6.1 Physical Configuration

The PA50 is designed to fit into a 19 inch rack mounted frame. The installed height is
4RU or 178mm and the depth is 350mm The amplifier is 125mm wide. An extruded
aluminium heatsink with vertical fins and an enclosed fan is used. The temperature
rise can be as high as 50 degrees depending on output power.

6.2 Indicators and Test Points

Power On Green LED
RF Power Yellow LED

Temperature 75 degrees + Red LED
Forward Power DB9 pin 8 and GND
Reverse Power DB9 pin 4 and GND
O/P Drain Current DB9 pins 2 and 5
Driver Drain Current DB9 pins 6 and 5
+28V DB9 pin 5
GND DB9 pin 1

6.3 Electrical Specifications

6.3.1 Power Requirements

Operating Voltage 26 to 30VDC ( available O/P power reduced below 26V
)
Current Drain Approx 10A at 28V and 100W O/P
Polarity Negative Ground

Frequency Range PA50A25 to 32MHz
PA50B 30 to 40MHz
PA50C 38 to 50MHz

Page 8 RF Technology PA50

6.3.1 Power Requirements 6 SPECIFICATIONS

Nominal Antenna Impedance: 50 ohms

Output Power: 20 to 100 Watts

Transmit Duty Cycle: 100W Continuous up to 60 degrees C ambient

Spurious Emissions: less than 0.25uW

Maximum Heatsink Temperature: 110 degrees C

Mismatch Protection: Protected from damage by control from the

exciter

Connectors: Antenna connector - N type female on rear panel
Power and exciter interface - DB25 Female on rear panel
RF Input - BNC female on rear panel
Test connector - DB9 female on front panel

RF Technology PA50 Page 9

A ENGINEERING DRAWINGS

A Engineering Drawings

1. Block Diagram

2. Main PCB Schematics ( 3 sheets )

Page 10 RF Technology PA50

B PA50 PARTS LIST

B Parts List

Main PCB Assembly

Ref. Description Part Number

A200 Transformer Reflectometer 37/PA50/REFL
C1 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C2 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C3 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C4 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C5 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C6 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C7 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C8 Capacitor 330-560uF 35-50V low ESR
electrolytic 5mm pitch 41/200L/470U
C100 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C101 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C102 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C103 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C104 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C105 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C106 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C107 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C108 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C109 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C110 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C111 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C112 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C113 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C114 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C115 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C116 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C117 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C118 Capacitor 10uF +80/-20% 35V electrolytic

2.5mm pitch 41/200L/010U
C119 Capacitor 10uF +80/-20% 35V electrolytic

2.5mm pitch 41/200L/010U
C120 Capacitor 10nF 10% 50V NPO 1812 46/82N1/010N
C122 Capacitor 10nF 10% 50V NPO 1812 46/82N1/010N
C123 Capacitor 10nF 10% 50V NPO 1812 46/82N1/010N
C124 Capacitor 10nF 10% 50V NPO 1812 46/82N1/010N
C125 Capacitor 10nF 10% 50V NPO 1812 46/82N1/010N
C126 Capacitor 10nF 10% 50V NPO 1812 46/82N1/010N
C127 Capacitor 10nF 10% 50V NPO 1812 46/82N1/010N
C128 Capacitor 10nF 10% 50V NPO 1812 46/82N1/010N
C129 Capacitor 10nF 10% 50V NPO 1812 46/82N1/010N
C200 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C201 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C202 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N

RF Technology PA50 Page 11

B PA50 PARTS LIST

Ref. Description Part Number

C203 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C204 Capacitor 10uF +80/-20% 35V electrolytic

2.5mm pitch 41/200L/010U
C205 Capacitor 10uF +80/-20% 35V electrolytic

2.5mm pitch 41/200L/010U
C206 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C207 Capacitor 68pF 5% 63V NPO 1206 46/3300/068P
C208 Capacitor 68pF 5% 63V NPO 1206 46/3300/068P
C209 Capacitor 6-100pF variable 49/3006/100P
C210 Capacitor 3p3F +/- 0.5pF 500V silver mica 1210 48/3003/03P3
C211 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C212 Capacitor 100nF 10% 63V X7R 1206 46/3310/100N
C213 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C214 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C217 Capacitor 22pF 5% 63V NPO 1206 46/3300/022P
C218 Capacitor 22pF 5% 63V NPO 1206 46/3300/022P
C219 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C220 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C221 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
C222 Capacitor 1nF 5% 63V NPO 1206 46/3310/01N0
D100 Diode BAV99 SOT-23 21/3010/AV99
D101 Diode BAV99 SOT-23 21/3010/AV99
D102 Diode BAV99 SOT-23 21/3010/AV99
D103 Diode BAV99 SOT-23 21/3010/AV99
D200 Diode BAV99 SOT-23 21/3010/AV99
D201 Diode BAV99 SOT-23 21/3010/AV99
D202 Diode ZRC400F03 4.096V reference 3%
100ppm SOT-23 29/VREF/0001
D203 Diode SM4004 Std recovery 50V !A SMA package 24/SMA1/4004
D204 Diode BAS21 SOT-23 21/000B/AS21
D205 Diode BAT17 SOT-23 21/3030/0017
D206 Diode BAT17 SOT-23 21/3030/0017
D207 Diode BZX84C10 10V zener 350mW 10% SOT-23 21/4050/C10V
J1 Connector 6.35mm QC Vertical Tab 35/0635/0001
J2 Connector 6.35mm QC Vertical Tab 35/0635/0001
J3 Connector 10 way female 35/2501/0010
J201 Connector 6 way male 35/2501/0006
J202 Connector 2 way male locking 35/2505/0002
J203 Connector 2 way male 35/2501/0002
J204 Connector 2 way male 35/2501/0002
J205 Connector 2 way male 35/2501/0002
L1 Inductor 3u3H 20% >100mA 1008 37/3320/P101
L100 Inductor Ferrite beads 3x4x1 4S2 37/1022/0001
L101 Inductor Ferrite beads 3x4x1 4S2 37/1022/0001
L103 Inductor 8 turns on 20mm toroid 37/PA50/0003
L104 Inductor 315nH 11 turns CW 6.35mm ID 37/0635/1511
L105 Inductor 315nH 11 turns CW 6.35mm ID 37/0635/1511
L107 Inductor 247nH 9 turns CW 6.35mm ID 37/0635/1509
L200 Inductor 33uH 10% >100mA 1812 37/3320/P102
Q100 Transistor MRF174 RF Power mosfet 27/3020/MRF174

Page 12 RF Technology PA50

B PA50 PARTS LIST

Ref. Description Part Number

Q101 Transistor MRF174 RF Power mosfet 27/3020/MRF174
Q102 Transistor MRF136 RF Power mosfet 27/3020/MRF136
Q200 Transistor MMBT3904 NPN SOT-23 27/3020/3904
Q201 Transistor MMBT3904 NPN SOT-23 27/3020/3904
Q202 Transistor NDT3055 n-ch mosfet SOT-223 27/3020/3055
R1 Resistor 1K2 5% 1206 51/3380/01K2
R2 Resistor 1K2 5% 1206 51/3380/01K2
R3 Resistor 15K 1% 200ppm 0805 51/8511/015K
R4 Resistor 1K2 1% 200ppm 0805 51/8511/01K2
R100 Resistor 470R 1% 200ppm 0805 51/8511/470R
R101 Resistor 470R 1% 200ppm 0805 51/8511/470R
R102 Resistor 470R 1% 200ppm 0805 51/8511/470R
R103 Resistor 470R 1% 200ppm 0805 51/8511/470R
R104 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R105 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R106 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R107 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R108 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R109 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R110 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R111 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R112 Resistor 1R 10% 3W axial wirewound 51/1053/001R
R113 Resistor 0R05 20W T0-220 51/T220/0R05
R114 Resistor 100K 1% 200ppm 0805 51/8511/100K
R115 Resistor 100K 1% 200ppm 0805 51/8511/100K
R116 Resistor 100K 1% 200ppm 0805 51/8511/100K
R117 Resistor 100K 1% 200ppm 0805 51/8511/100K
R118 Not Fitted
R119 Resistor 1K5 5% 1W 200ppm 1218 51/8251/01K5
R120 Resistor 100R 5% 1W 200ppm 1218 51/8251/0100
R121 Resistor 100R 5% 1W 200ppm 1218 51/8251/0100
R122 Not Fitted
R123 Resistor 1K5 5% 1W 200ppm 1218 51/8251/01K5
R124 Resistor 220R 5% 1W 200ppm 1218 51/8251/0220
R125 Resistor 150R 5% 1W 200ppm 1218 51/8251/0150
R126 Resistor 100R 20W T0-220 51/T220/0100
R127 Resistor 100R 20W T0-220 51/T220/0100
R128 Resistor 0R05 20W T0-220 51/T220/0R05
R129 Resistor 150R 5% 1W 200ppm 1218 51/8251/0150
R130 Resistor 150R 5% 1W 200ppm 1218 51/8251/0150
R131 Resistor 150R 5% 1W 200ppm 1218 51/8251/0150
R132 Resistor 150R 5% 1W 200ppm 1218 51/8251/0150
R133 Resistor 150R 5% 1W 200ppm 1218 51/8251/0150
R134 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R135 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R136 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R137 Resistor 15K precision 0.5% 50ppm 0805 51/85P1/015K
R138 Resistor 2R7 10% 3W axial wirewound 51/1053/02R7
R200 Resistor 15K 1% 200ppm 0805 51/8511/015K
R201 Resistor 6K8 1% 200ppm 0805 51/8511/06K8

RF Technology PA50 Page 13

B PA50 PARTS LIST

Ref. Description Part Number

R202 Resistor 1K5 5% 1206 51/3380/01K5
R203 Resistor 39K 1% 200ppm 0805 51/8511/039K
R204 Resistor 39K 1% 200ppm 0805 51/8511/039K
R208 Resistor 68K 1% 200ppm 0805 51/8511/068K
R209 Resistor 4K7 1% 200ppm 0805 51/8511/04K7
R210 Resistor 10K 1% 200ppm 0805 51/8511/010K
R211 Resistor 10K 1% 200ppm 0805 51/8511/010K
R212 Resistor 10K 1% 200ppm 0805 51/8511/010K
R213 Resistor 10K 1% 200ppm 0805 51/8511/010K
R214 Resistor 10K 1% 200ppm 0805 51/8511/010K
R215 Resistor 10K 1% 200ppm 0805 51/8511/010K
R216 Resistor 100K 1% 200ppm 0805 51/8511/100K
R217 Resistor 100K 1% 200ppm 0805 51/8511/100K
R218 Resistor 22R 5% 1W 200ppm 1218 51/8251/0022
R219 Resistor 1K 1% 200ppm 0805 51/8511/01K0
R222 Resistor 4K7 1% 200ppm 0805 51/8511/04K7
R223 Resistor 100R 1% 200ppm 0805 51/8511/100R
R224 Resistor 560R 1% 200ppm 0805 51/8511/560R
R225 Resistor 470R 1% 200ppm 0805 51/8511/470R
R226 Resistor 470R 1% 200ppm 0805 51/8511/470R
R227 Resistor 22R 5% 1W 200ppm 1218 51/8251/0022
R228 Resistor 100K variable 11 turn 4mm gull wing 53/SMV1/100K
R238 Resistor 100K variable 11 turn 4mm gull wing 53/SMV1/100K
R235 Resistor 33R 5% 1W 200ppm 1218 51/8251/0033
R236 Resistor 4K7 5% 1206 51/3380/04K7
R237 Resistor 4K7 5% 1206 51/3380/04K7
R238 Resistor 1K variable 11 turn 4mm gull wing 53/SMV1/001K
R239 Resistor 1K variable 11 turn 4mm gull wing 53/SMV1/001K
R240 Resistor 1K variable 11 turn 4mm gull wing 53/SMV1/001K
R242 Resistor 1M 1% 200ppm 0805 51/8511/01M0
R243 Resistor 10K 1% 200ppm 0805 51/8511/010K
R244 Resistor 4K7 1% 200ppm 0805 51/8511/04K7
T100 Transformer 4:1 Unbalanced 37/PA50/0004
T101 Transformer 1:1 Balun 37/PA50/0004
T102 Transformer 1:9 RF Output 37/PA50/0001
U100 IC LM224 Quad op-amp SO-14 29/000L/M224
U200 IC LM224 Quad op-amp SO-14 29/000L/M224
U201 IC LM224 Quad op-amp SO-14 29/000L/M224
U202 IC 74HC125 buffer SO-14 26/2030/C125
U203 IC TLC542 8 bit A/D converter SO-20 29/00TL/C542
U204 IC LM61 Temperature sensor SOT-23 29/0001/LM61
U205 IC LM7805CT Regulator TO-220 25/2040/85CT

Frequency Dependant Parts PA50A ( 25 – 32 MHz )

C9 Capacitor 27pF 1% 500V Silver Mica 1210 48/3003/027P
C10 Capacitor 33pF 1% 500V Silver Mica 1210 48/3003/033P
C11 Capacitor 18pF 1% 500V Silver Mica 1210 48/3003/018P
C12 Capacitor 3p3F +/- 0.1pF 500V Silver Mica 1210 48/3003/03P3
C13 Capacitor 56pF 1% 500V Silver Mica 1210 48/3003/056P

Page 14 RF Technology PA50

B PA50 PARTS LIST

Ref. Description Part Number

C14 Capacitor 18pF 1% 500V Silver Mica 1210 48/3003/018P
C15 Capacitor 27pF 1% 500V Silver Mica 1210 48/3003/027P
C16 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C17 Capacitor 33pF 1% 500V Silver Mica 1210 48/3003/033P
C18 Not Fitted
C19 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C20 Capacitor 56pF 1% 500V Silver Mica 1210 48/3003/056P
C21 Not Fitted
C22 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C23 Capacitor 68pF 1% 500V Silver Mica 1210 48/3003/068P
C24 Capacitor 3p3F +/- 0.1pF 500V Silver Mica 1210 48/3003/03P3
C25 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C26 Capacitor 10pF +/- 0.1pF 500V Silver Mica 1210 48/3003/010P
C28 Capacitor 68pF 1% 500V Silver Mica 1210 48/3003/068P
C29 Capacitor 68pF 1% 500V Silver Mica 1210 48/3003/068P
C121 Capacitor 120pF 5% 63V NPO 1206 46/3300/120P
C130 Capacitor 470pF 5% 63V NPO 1206 46/3300/470P
C131 Capacitor 100pF 5% 63V NPO 1206 46/3300/100P
C132 Capacitor 120pF 5% 63V NPO 1206 46/3300/120P
C133 Capacitor 220pF 5% 63V NPO 1206 46/3300/220P
C1000 Capacitor 180pF 1% 500V Silver Mica 1210 48/3003/180P
C1001 Not Fitted
L2 Inductor 184nH 7 turns CW 6.35mm ID 37/0635/1507
L3 Inductor 247nH 9 turns CW 6.35mm ID 37/0635/1509
L4 Inductor 247nH 10 turns CW 6.35mm ID 37/0635/1510
L5 Inductor 284nH 10 turns CW 6.35mm ID 37/0635/1510
L6 Inductor 247nH 9 turns CW 6.35mm ID 37/0635/1509
L102 Inductor 307nH Coilcraft Maxispring 37/MAXI/307N
L106 Inductor 558nH Coilcraft Maxispring 37/MAXI/558N

Frequency Dependant Parts PA50B ( 30 – 40 MHz )

C9 Capacitor 33pF 1% 500V Silver Mica 1210 48/3003/033P
C10 Capacitor 27pF 1% 500V Silver Mica 1210 48/3003/027P
C11 Capacitor 12pF 1% 500V Silver Mica 1210 48/3003/012P
C12 Capacitor 5p6F +/- 0.1pF 500V Silver Mica 1210 48/3003/05P6
C13 Capacitor 47pF 1% 500V Silver Mica 1210 48/3003/047P
C14 Capacitor 15pF 1% 500V Silver Mica 1210 48/3003/015P
C15 Capacitor 12pF 1% 500V Silver Mica 1210 48/3003/012P
C16 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C17 Capacitor 12pF 1% 500V Silver Mica 1210 48/3003/012P
C18 Capacitor 4p7F +/- 0.1pF 500V Silver Mica 1210 48/3003/04P7
C19 Capacitor 82pF 1% 500V Silver Mica 1210 48/3003/082P
C20 Capacitor 47pF 1% 500V Silver Mica 1210 48/3003/047P
C21 Capacitor 4p7F +/- 0.1pF 500V Silver Mica 1210 48/3003/04P7
C22 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C23 Capacitor 47pF 1% 500V Silver Mica 1210 48/3003/047P
C24 Not Fitted
C25 Capacitor 82pF 1% 500V Silver Mica 1210 48/3003/082P
C26 Capacitor 10pF +/- 0.1pF 500V Silver Mica 1210 48/3003/010P

RF Technology PA50 Page 15

B PA50 PARTS LIST

Ref. Description Part Number

C28 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C29 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C121 Capacitor 82pF 5% 63V NPO 1206 46/3300/082P
C130 Capacitor 330pF 5% 63V NPO 1206 46/3300/330P
C131 Capacitor 100pF 5% 63V NPO 1206 46/3300/100P
C132 Capacitor 100pF 5% 63V NPO 1206 46/3300/100P
C133 Capacitor 180pF 5% 63V NPO 1206 46/3300/180P
C1000 Capacitor 150pF 1% 500V Silver Mica 1210 48/3003/150P
C1001 Not Fitted
L2 Inductor 150nH 6 turns CW 6.35mm ID 37/0635/1506
L3 Inductor 184nH 7 turns CW 6.35mm ID 37/0635/1507
L4 Inductor 215nH 8 turns CW 6.35mm ID 37/0635/1508
L5 Inductor 215nH 8 turns CW 6.35mm ID 37/0635/1508
L6 Inductor 215nH 8 turns CW 6.35mm ID 37/0635/1508
L102 Inductor 307nH Coilcraft Maxispring 37/MAXI/307N
L106 Inductor 491nH Coilcraft Maxispring 37/MAXI/491N

Frequency Dependant Parts PA50C ( 38 – 50 MHz )

C9 Capacitor 15pF 1% 500V Silver Mica 1210 48/3003/015P
C10 Capacitor 12pF 1% 500V Silver Mica 1210 48/3003/012P
C11 Capacitor 12pF 1% 500V Silver Mica 1210 48/3003/012P
C12 Capacitor 3p9F +/- 0.1pF 500V Silver Mica 1210 48/3003/03P9
C13 Capacitor 47pF 1% 500V Silver Mica 1210 48/3003/047P
C14 Not Fitted
C15 Capacitor 18pF 1% 500V Silver Mica 1210 48/3003/018P
C16 Capacitor 82pF 1% 500V Silver Mica 1210 48/3003/082P
C17 Capacitor 4p7F +/- 0.1pF 500V Silver Mica 1210 48/3003/04P7
C18 Capacitor 12pF 1% 500V Silver Mica 1210 48/3003/012P
C19 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C20 Not Fitted
C21 Not Fitted
C22 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C23 Capacitor 12pF 1% 500V Silver Mica 1210 48/3003/012P
C24 Not Fitted
C25 Capacitor 33pF 1% 500V Silver Mica 1210 48/3003/033P
C26 Capacitor 39pF +/- 0.1pF 500V Silver Mica 1210 48/3003/039P
C28 Capacitor 68pF 1% 500V Silver Mica 1210 48/3003/068P
C29 Capacitor 68pF 1% 500V Silver Mica 1210 48/3003/068P
C121 Capacitor 82pF 5% 63V NPO 1206 46/3300/082P
C130 Capacitor 180pF 5% 63V NPO 1206 46/3300/180P
C131 Capacitor 68pF 5% 63V NPO 1206 46/3300/068P
C132 Capacitor 68pF 5% 63V NPO 1206 46/3300/068P
C133 Capacitor 180pF 5% 63V NPO 1206 46/3300/180P
C1000 Capacitor 100pF 1% 500V Silver Mica 1210 48/3003/100P
C1001 Not Fitted
L2 Inductor 121nH 5 turns CW 6.35mm ID 37/0635/1505
L3 Inductor 150nH 6 turns CW 6.35mm ID 37/0635/1506
L4 Inductor 184nH 7 turns CW 6.35mm ID 37/0635/1507
L5 Inductor 184nH 7 turns CW 6.35mm ID 37/0635/1507

Page 16 RF Technology PA50

B PA50 PARTS LIST

Ref. Description Part Number

L6 Inductor 150nH 6 turns CW 6.35mm ID 37/0635/1506
L102 Inductor 246nH Coilcraft Maxispring 37/MAXI/246N
L106 Inductor 380nH Coilcraft Maxispring 37/MAXI/380N

Front Panel PCB

R1 Resistor 100R 5% 0.25W axial 51/1040/0100
D1 Diode LED Yellow RA 21/1010/LEDY
D2 Diode LED Red RA 21/1010/LEDR
D3 Diode LED Green RA 21/1010/LEDG
J1 Connector 10 way header 35/2501/0010
J2 Connector DB9/F RA PCB mount 35/5012/009F

1 2 3 4

A

B

C

D

4321

D

C

B

A

Title

Number RevisionSize

A4

Date: 21-Feb-2002 Sheet of
File: C:\Program Files\Design Explorer 99 SE\rft\PA50.ddbDrawn By:

Driver Bias

RF Input Q100 Drive

Q101 Drive

Driver Drain Current

Q101 Drive

Q100 Drive

Q100 Bias
Q101 Bias O/P Drain current

Unfiltered RF Unfiltered RF Filtered RF Filtered RF RF Output

Fwd Volts
Rev Volts

Driver Bias

Q101 Bias

Q100 Bias

Temperature Compensation

Q100 Bias voltmeter
Q101 Bias voltmeter

Temperature Compensation

Driver Drain Current

Q101 Bias voltmeter

Q100 Bias voltmeter

O/P Drain current

Rev Volts

Fwd Volts

Temperature
Reverse Volts
CS
DATA-IO
CLK
Forward Volts
VREFB

Driver Stage O/P Stage Low Pass Filter Reflectometer

Bias Supply Metering

RF Input RF Ouput

1

14

2

15

3

16

4

17

5

18

6

19

7

20

8

21

9

22

10

23

11

24

12

25

13

J?

DB25

+28V

Temperature
Reverse Volts
CS
DATA-IO
CLK
Forward Volts
VREFB

PA50 Block Diagram

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

R238

1K

R215
10K

C206
100nF

R214
10K

BIAS-OP2

BIAS-DRV

C210
3p3F

L200
33uH

D205
BAT17

D206
BAT17

C207

68pF

C208

68pF

C209
6-100pF

A200

F/R_COAX

AIN0

1

AIN1

2

AIN2

3

AIN3

4

AIN4

5

AIN5

6

AIN6

7

AIN7

8

AIN8

9

AIN9

11

AIN10

12

GND

10

VCC

20

REF-

13

REF+

14

CS

15

DO

16

DI

17

CLK

18

EOC

19

U203

TLC542

1

4

10

13

2

5

9

12

3

6

8

11

7 14

U202

74HC125

R205
10K

R222

4.7K

+5V

DATA-IO
CLK
CS

+5V

+5V

R213
10K

BIAS-OP1

+5V

R204
39K

R212
10K C202

100nF

+5V

Q202

NDT3055

1
2

J202

CON2

3 3

PA50 100W Power Amplifier

D

21-Feb-2002 00:02:56

C:\Program Files\Design Explorer 99 SE\rft\PA50.ddb - HFPA_Support.Sch

Title

Size: Number:

Print Date:

File:

Revision:

Sheet of

A3

RF Technology Pty Ltd

Unit 10, 8 Leighton Place

Hornsby, NSW 2077

AustraliaRev. Release Date: Originator:

Rev No. ECO No. Description of Change

RF-FILT

R216
100K

R217 100K

+5V

R203
39K

R207
10K

R230
47K

R229
47K

C201
100nF

R242
1M

R202

1.5K

C203
100nF

R200
15K

R236

4.7K

+5V

TempLED

RFOLED

R225
1K

R226
1K

J204 LINK
J205 LINK

J203 LINK

CurrSense

DrvSense

B1Sense
B2Sense

PwrSense

R211
10K

R210
10K

R206
10K

+5V

R224
560R

R223
100R

S1
S2

S0

S1

S2

S0

S1
S2

S0

S[0..2]

Forward & Reflected Power Meter

Fan Switch and Temperature Indicator

Measurement Interface

Bias Voltage Temperature Compensation

Bias Voltage Adjustments

RF Output Indicator

Identification Jumpers

V+

1

Vo

2

GND

3

U204
LM61

+5V

+5V

+5V

+

C204
10uF

R237

4.7K

R241
180K

C200100nF

J200

COAX-PAD

D203
SM4004

D207
BZX84C10

D202
ZRC400F03

Q201

MMBT3904

Q200
3904

Q203

FMMT38C

D204
BAS21

R239

1K

R240

1K

R227
100K

R228
100K

R218
22R

R220
22R

Vin

1

GND

2

Vout

3

U205
LM7805CT

+

C205
10uF

+28F

2

3

1

U200A

LM224

5

6

7

U200B

LM224

V+

4

V-

11

U200E
LM224

14

13

12

U200D

LM224

9

10

8

U200C

LM224

V+

4

V-

11

U201E
LM224

2

3

1

U201A

LM224

5

6

7

U201B

LM224

9

10

8

U201C

LM224

14

13

12

U201D

LM224

+28F

R201
6K8

R231
56K

R243
10K

R244

4.7K

+5V

D200
BAV99

D201
BAV99

+28V

R235
33R

Pwr-Rev

Pwr-Fwd

C211

100nF

RF-UNFILT

R208
68K

C213
1nF

C212
100nF

C214

1nF

TP203

TEST-POINT

TP204

TEST-POINT

TP200
TEST-POINT

C219 1nF

C221
1nF

R209

4.7K

R219
1K

C220
1nF

C222
1nF

VREFB

C218
22pF

C217
22pF

1
2
3
4
5
6

J201

CON6

Pwr-Fwd
Pwr-Rev

Pwr-Rev

Pwr-Fwd

Temperature

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

C126

22nF

C127

22nF

R126
100R

R127
100R

BIAS-OP2

C129

22nF

R125
150R

C120

22nF

BIAS-DRV

L101
BEADS

C114
1nF

C104
100nF

C101
100nF

+

C119
10uF

L103
TOROID-20MM

C115
1nF

C105
100nF

R121
100R

C106
100nF

C116
1nF

R123
1K2

C107
100nF

C117
1nF

C123

22nF

C124

22nF

R118
NF

C103
100nF

C113
1nF

BIAS-OP1

R113
0R05

O/P-DCurr

RF-UNFILT

2 3

PA50 100W Power Amplifier

D

21-Feb-2002 00:01:56

C:\Program Files\Design Explorer 99 SE\rft\PA50.ddb - HFPA_Main.Sch

Title

Size: Number:

Print Date:

File:

Revision:

Sheet of

A3

RF Technology Pty Ltd

Unit 10, 8 Leighton Place

Hornsby, NSW 2077

AustraliaRev. Release Date: Originator:

Rev No. ECO No. Description of Change

C122

22nF

C125

22nF

+28V

+28F

CurrSense

R101
470R

+5V

R102
470R

R103
470R

B1Sense

B2Sense

R114
100K

R116
100K

R115
100K

R117
100K

BIAS-OP1

BIAS-OP2

BIAS-DRV

BIAS-OP1

BIAS-OP2

Driver Stage

Output Stage

Bias Voltage Measurement Interface

Drain Current Meter

L100
BEADS

C112
1nF

C102
100nF

C100
100nF

+

C118
10uF

R112
1R0

+28V

R100
470R

+5V

Drain Current Meter

+5V

+5V

DrvSense

Drv-DCurr

RF-UNFILT

J100

COAX-PAD

C108
1nF

C109
1nF C110

1nF

C111
1nF

T102
RF-TFORMER-9:1

T100
4:1-UNBAL

R124
220R

R120
100R

R119
1K2

T101

1:1-BALUN

R122
NF

C128
22nF

Q102
MRF136

Q100
MRF174

Q101
MRF174

2

3

1

U100A

LM224

V+

4

V-

11

U100E

LM224

9

10

8

U100C

LM224

14

13

12

U100D

LM224

5

6

7

U100B

LM224

D100
BAV99

D101
BAV99

D102
BAV99

D103
BAV99

R106
21K

R107
21K

R104
21K

R105
21K

R108
21K

R109
21K

R110
21K

R111
21K

R128
0R05

C121

see table

C131

see table

C133

see table

C130
see table

C132
see table

L102
see table

L106
see table

L107
247nH

L104
315nH

L105
315nH

R129
150R

TP102

TEST-POINT

TP103

TEST-POINT

TP100

TEST-POINT

TP101

TEST-POINT

R131
150R

R133
150R

R130
150R

R132
150R

VREFB

VREFB VREFB

R134
21K

R135
21K

R136
21K

R137
21K

R138
2R7

Note: C1000 is soldered accross the transformer primary pads onto the PCB
Note: C1001 is soldered directly onto the transformer front PCB

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

Title

Number RevisionSize

A3

Date: 21-Feb-2002 Sheet of
File: C:\Program Files\Design Explorer 99 SE\rft\PA50.ddbDrawn By:

1

6

2

7

3

8

4

9

5

J2

DB9

D3

LED

D2

LED

D1

LED

+28V

+28V

Power LED

Over Temperature LED

RF Output LED

Drv_DCurr

O/P_DCurr

FwdPwr

RevPwr

R1

100

1
2
3
4
5
6
7
8
9

10

J1

CON10

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

RF-UNFILT

BIAS-DRV

BIAS-OP1
BIAS-OP2

Drv-DCurr

O/P-DCurr

CurrSense

B1Sense
B2Sense

DrvSense

VREFB

Amplifier
HFPA_Main.sch

BIAS-DRV
BIAS-OP1
BIAS-OP2

RF-FILT

RFOLED

TempLED

CurrSense

B1Sense
B2Sense

PWRSense

DrvSense

Pwr-Fwd

Pwr-Rev

RF-UNFILT

VREFB

Support
HFPA_Support.sch

1 3

PA50 100W Power Amplifier

D

21-Feb-2002 00:00:37

C:\Program Files\Design Explorer 99 SE\rft\PA50.ddb - HFPwrAmp.prj

Title

Size: Number:

Print Date:

File:

Revision:

Sheet of

A3

RF Technology Pty Ltd

Unit 10, 8 Leighton Place

Hornsby, NSW 2077

AustraliaRev. Release Date: Originator:

Rev No. ECO No. Description of Change

C5
100nF

C2
100nFC3100nFC4100nF

+5Vbypass caps

RF-UNFILT

BIAS-DRV
BIAS-OP1
BIAS-OP2

J1

SPADE

J2

SPADE

+28V

O/P-DCurr

+28V

RFOLED
TempLED

PWRLED

CurrSense

B1Sense
B2Sense

R3
15K

R4

1.2K

+28F

C1
100nF
U1 U2U3 U4 U5

C9

see table

C10

see table

C11

see table

C13
see table

C16
see table

C19
see table

C22
see table

RF Output Low Pass Filter

C12

see table

C25
see table

Drv-DCurr

R1

1.2K

R2

1.2K

+28V

+

C8
470uF

L1
3u3H

C6
100nF

C7
1nF

+28F

+28F

DrvSense

C14
see table

C17
see table

C20
see table

C23
see table

C26
see table

C24

see table

C21

see table

C18

see table

C15

see table

L2
see table

L3
see table

L4
see table

L5
see table

1
2
3
4
5
6
7
8
9
10

J3

CON10

Pwr-Fwd

Pwr-Rev

C27
100nF

VREFB

L6
see table

C28
see table

C29
see table

SH1 SHIELD_LPF

Ref

L2
L3
L4
L5
L6
C13
C14
C9
C15
C16
C17
C10
C18
C19
C20
C11
C21
C22
C23
C12
C24
C25
C26
C28
C29
L102
L106
C121
C130
C131
C132
C133
C1000
C1001

PA50A
(25-32MHz)
184nH
247nH
284nH
284nH
247nH
56pF
18pF
27pF
27pF
100pF
33pF
33pF
NF
100pF
56pF
18pF
NF
100pF
68pF
3p3F
3p3F
100pF
10pF
68pF
68pF
307nH
558nH
120pF
470pF
100pF
120pF
220pF
180pF
NF

PA50B
(30-40MHz)
150nH
184nH
215nH
215nH
215nH
47pF
15pF
33pF
12pF
100pF
12pF
27pF
4p7F
82pF
47pF
12pF
4p7F
100pF
47pF
5p6F
NF
82pF
10pF
100pF
100pF
307nH
491nH
82pF
330pF
100pF
100pF
180pF
160pF
NF

PA50C
(38-50MHz)
121nH
150nH
184nH
184nH
150nH
47pF
NF
15pF
18pF
82pF
4p7F
12pF
12pF
100pF
NF
12pF
NF
100pF
12pF
3p9F
NF
33pF
39pF
68pF
68pF
246nH
380nH
82pF
180pF
68pF
68pF
180pF
100pF
120pF