Eclipse Series

RF Technology
rfinfo@rftechnology.com.au

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
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

Page 2 RF Technology PA50

1 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 reserves the
right to change performance and specification without
further notice.

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

RF Technology PA50 Page 3

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

Page 4 RF Technology PA50

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

RF Technology PA50 Page 5

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

Page 6 RF Technology PA50

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

RF Technology PA50 Page 7

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

Page 8 RF Technology PA50

A ENGINEERING DRAWINGS

A Engineering Drawings

1. Block Diagram

2. Main PCB Schematics ( 3 sheets )

RF Technology PA50 Page 9

 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

Page 10 RF Technology PA50

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
RF Technology PA50 Page 11
 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
Page 12 RF Technology PA50
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
RF Technology PA50 Page 13
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
Page 14 RF Technology PA50
 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
RF Technology PA50 Page 15
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

Page 16 RF Technology PA50

 1 2 3 4

D D

Driver Stage O/P Stage Low Pass Filter Reflectometer

RF Input RF Input Q100 Drive Q100 Drive Unfiltered RF Unfiltered RF Filtered RF Filtered RF RF Output RF Ouput

Q101 Drive Q101 Drive

Driver Drain Current
Q100 Bias Fwd Volts
Driver Bias Q101 Bias O/P Drain current Rev Volts

C C

Bias Supply Metering

+28V

J? Driver Bias Q100 Bias Rev Volts

Q101 Bias O/P Drain current
13
Fwd Volts
25
Temperature Compensation Temperature Compensation
12
Q100 Bias voltmeter Q100 Bias voltmeter
24
Q101 Bias voltmeter Q101 Bias voltmeter
11
23
B B
10
22
Driver Drain Current
9
21 Temperature
Temperature
8 Reverse Volts
Reverse Volts
20 CS
CS
7 DATA-IO
DATA-IO
19 CLK
CLK
6 Forward Volts
Forward Volts
18 VREFB
VREFB
5
17
4
16
3
15
2
14
1 Title
A A
DB25 PA50 Block Diagram
Size Number Revision
A4
Date: 21-Feb-2002 Sheet of
File: C:\Program Files\Design Explorer 99 SE\rft\PA50.ddb
Drawn By:
1 2 3 4
 1 2 3 4 5 6 7 8

D202
Measurement Interface ZRC400F03 R224 +5V
560R +5V
+5V U203
R244 Pwr-Fwd
14 20 U200A
100nF C200 13 REF+ VCC Pwr-Rev
4.7K 2
REF- D200 R227
J201 U202 1 Pwr-Fwd 1
R223 AIN0 BAV99 R225 100K
DATA-IO 3 2 16 2 Pwr-Rev 3 +5V
1 DO AIN1 C217
CLK 100R 1 3 1K
2 AIN2 22pF LM224
CS 5 6 17 4
3 DI AIN3 PwrSense

4
Pwr-Fwd 4 5 C222
4 AIN4 CurrSense
D Pwr-Rev 8 9 18 6 1nF D
5 CLK AIN5 DrvSense
Temperature 10 7 U200E

V+
6 AIN6 B1Sense
12 11 15 8 LM224
CS AIN7 B2Sense
CON6 13 +5V 19 9 S0
EOC AIN8
7 14 11 S1 +5V

V-
AIN9
10 12 S2
GND AIN10
+5V 74HC125 U200B
R222 TLC542 6

11
S[0..2]
7 D201 R228
4.7K R226
5 BAV99 100K
+5V C218
R205 R206 1K
Q200 S0 22pF LM224
3904 10K 10K U201A
3
R210 S1 1
R243 VREFB
10K S0 J203 LINK 2
10K S1 J204 LINK +5V
R211 S2 S2 J205 LINK LM224
10K TP200

1
Identification Jumpers TEST-POINT
U204 U201B
LM61 5

V+
+5V 7
2 6
Vo

GND
R217 100K LM224
C213 U201C
C219 1nF R229 1nF 10
C +28V C211 8 C

3
47K R235
R203 9
39K
33R
U200D 100nF LM224
R216 13 J202 D203 U200C +5V
14 R230 SM4004 10 R204
100K 1 R219
12 47K 8 39K
2
1K 9 TP203 TP204 +28F
LM224 CON2
LM224

4
R207 Bias Voltage Temperature Compensation Q202 R212 R231 TEST-POINT TEST-POINT
10K C201 R208 C220 10K C202 56K
100nF 1nF 100nF U201E

V+
68K
NDT3055 LM224
Forward & Reflected Power Meter

V-
R209 C207 C208

11
R236 4.7K
+5V C221
TempLED 1nF 68pF 68pF
4.7K
D205 D206
+ C204 R237 BAT17 BAT17
10uF
4.7K
U201D R201 C209
Fan Switch and Temperature Indicator 12 6K8 6-100pF
R200 14
13 C212 L200
B 15K B
Q201 100nF 33uH
MMBT3904 LM224
R218 R220

22R 22R
+28F
C210
U205 3p3F
LM7805CT A200 J200
1 3
Vin Vout RF-FILT
GND

+ C205 D204 F/R_COAX

10uF C206 RF-UNFILT
BAS21
100nF
C214 COAX-PAD
2

R202
RFOLED
1.5K
1nF

1K R242
R240 R213 Q203 1M
BIAS-OP1
10K

1K
R239 R214
BIAS-OP2
10K
FMMT38C
A A
1K R241 Rev No. ECO No. Description of Change
R238 R215 D207 180K C203
BIAS-DRV
10K
BZX84C10 100nF Title PA50 100W Power Amplifier

Size: A3 Number: Revision: D

RF Technology Pty Ltd
Print Date: 21-Feb-2002 00:02:56 Sheet 3 of 3 Unit 10, 8 Leighton Place
Bias Voltage Adjustments
Hornsby, NSW 2077
Rev. Release Date: Originator: Australia
RF Output Indicator
File: C:\Program Files\Design Explorer 99 SE\rft\PA50.ddb - HFPA_Support.Sch

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

Drain Current Meter TP100 +28V TP102 +28V

Drain Current Meter

R112
TEST-POINT TEST-POINT
R134 R136 R113
1R0 0R05
21K 21K
+5V +28F +5V
R105 R107
21K R138 D101 21K
R108 R110

4
D100 U100D 2R7 BAV99 U100C
21K 21K R128
BAV99 13 9
R100 R101
D 14 U100E 8 D
DrvSense CurrSense

V+
0R05
12 10
470R 470R
LM224 R109 + C118 LM224 R111
21K 21K

V-
R104 C100 10uF
21K C108 C109 100nF LM224 R106 C111 C101 + C119
1nF 1nF TP101 L100 21K C110 1nF 100nF 10uF

11
BEADS 1nF
TP103
VREFB R135 TEST-POINT VREFB R137
VREFB
21K 21K
TEST-POINT
Drv-DCurr
O/P-DCurr
+5V L101
BEADS

U100A
D102 2
BAV99 R102 1 C112 C102 BIAS-OP1
B1Sense R115 100nF BIAS-OP1
3 BIAS-OP1 1nF
470R C104
C114
100K 100nF
LM224 R119 R118 1nF
R114 1K2 NF C113 C103
100K 1nF 100nF

L103

C TOROID-20MM C
+5V
C122 C126
R126 L105
U100B 100R 315nH
D103 6 22nF 22nF
BAV99 R103 7
B2Sense R117
470R 5 BIAS-OP2
C123 Q100 T102
100K
LM224 MRF174 RF-TFORMER-9:1
R116
Bias Voltage Measurement Interface 100K 22nF RF-UNFILT
RF-UNFILT
T101
1:1-BALUN

C124
J100 C121 C131 C133
C120 Q101 C128 C115 C105
22nF MRF174 22nF 1nF 100nF
see table see table see table
22nF
C130 C132 R130 R132 C125 C127
see table see table 150R 150R R127 L104
COAX-PAD
100R 315nH
22nF 22nF
Output Stage
B B

L102 L106 Note: C1000 is soldered accross the transformer primary pads onto the PCB
see table see table R131 R133 Note: C1001 is soldered directly onto the transformer front PCB
150R 150R
R123 R122
1K2 NF

BIAS-OP2
R125 R129 BIAS-OP2
150R 150R C117 C107
1nF 100nF

T100
4:1-UNBAL L107
247nH R124
220R

C129 Q102
MRF136

22nF
R120 R121
100R 100R
Driver Stage
A A
BIAS-DRV Rev No. ECO No. Description of Change
BIAS-DRV
Title PA50 100W Power Amplifier
C116 C106
1nF 100nF Size: A3 Number: Revision: D
RF Technology Pty Ltd
Print Date: 21-Feb-2002 00:01:56 Sheet 2 of 3 Unit 10, 8 Leighton Place
Hornsby, NSW 2077
Rev. Release Date: Originator: Australia
File: C:\Program Files\Design Explorer 99 SE\rft\PA50.ddb - HFPA_Main.Sch

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

D D

J1 +28V
C C
1
2
3
4
5
6
7
8
LED Power LED
9
10 D3

CON10
LED
D1 RF Output LED

LED Over Temperature LED

D2

J2
100 +28V
R1
5
9
4 RevPwr
8 FwdPwr
3
7
2 O/P_DCurr
B B
6 Drv_DCurr
1

DB9

A A

Title

Size Number Revision

A3

Date: 21-Feb-2002 Sheet of

File: C:\Program Files\Design Explorer 99 SE\rft\PA50.ddb
Drawn By:

1 2 3 4 5 6 7 8
 1 2 3 4 5 6 7 8

+28F +28V J1
L1
3u3H

SPADE
D + C8 D
C7 C6 470uF
1nF 100nF J2

bypass caps +5V +28F

SPADE

C1 C2 C3 C4 C5 C27
100nF 100nF 100nF 100nF 100nF 100nF
U1 U3 U4 U5 U2

Amplifier Support
HFPA_Main.sch HFPA_Support.sch
+28V J3
O/P-DCurr 1
Pwr-Rev
Drv-DCurr Pwr-Rev 2
Pwr-Fwd
Pwr-Fwd 3
BIAS-DRV O/P-DCurr
BIAS-DRV BIAS-DRV 4
BIAS-OP1 Drv-DCurr
BIAS-OP1 BIAS-OP1 5
BIAS-OP2
BIAS-OP2 BIAS-OP2 6
VREFB PWRLED
VREFB VREFB 7
CurrSense RFOLED
C CurrSense CurrSense RFOLED 8 C
DrvSense TempLED
DrvSense DrvSense TempLED 9
B1Sense
B1Sense B1Sense 10
B2Sense
B2Sense B2Sense
CON10

RF-UNFILT
RF-UNFILT RF-UNFILT
RF-FILT
PWRSense
L2 L3 L4 L5
see table see table see table see table R1
1.2K
C9 C10 C11 C12
L6
see table see table see table see table see table
+28F
C15 C18 C21 C24
R2
see table see table see table see table 1.2K
R3
15K +28V

C13 C14 C16 C17 C19 C20 C22 C23 C25 C26 C28 C29
see table see table see table see table see table see table see table see table see table see table see table see table

B B
R4
1.2K
Ref PA50A PA50B PA50C
(25-32MHz) (30-40MHz) (38-50MHz)
L2 184nH 150nH 121nH
RF Output Low Pass Filter
L3 247nH 184nH 150nH
L4 284nH 215nH 184nH
L5 284nH 215nH 184nH
SH1 SHIELD_LPF
L6 247nH 215nH 150nH
C13 56pF 47pF 47pF
C14 18pF 15pF NF
C9 27pF 33pF 15pF
C15 27pF 12pF 18pF
C16 100pF 100pF 82pF
C17 33pF 12pF 4p7F
C10 33pF 27pF 12pF
C18 NF 4p7F 12pF
C19 100pF 82pF 100pF
C20 56pF 47pF NF
C11 18pF 12pF 12pF
C21 NF 4p7F NF
C22 100pF 100pF 100pF
C23 68pF 47pF 12pF
C12 3p3F 5p6F 3p9F
C24 3p3F NF NF
C25 100pF 82pF 33pF
C26 10pF 10pF 39pF
C28 68pF 100pF 68pF
A C29 68pF 100pF 68pF A
Rev No. ECO No. Description of Change
L102 307nH 307nH 246nH
L106 558nH 491nH 380nH
C121 120pF 82pF 82pF
Title PA50 100W Power Amplifier
C130 470pF 330pF 180pF
C131 100pF 100pF 68pF Size: A3 Number: Revision: D
C132 120pF 100pF 68pF RF Technology Pty Ltd
C133 220pF 180pF 180pF Print Date: 21-Feb-2002 00:00:37 Sheet 1 of 3 Unit 10, 8 Leighton Place
C1000 180pF 160pF 100pF Hornsby, NSW 2077
C1001 NF NF 120pF Rev. Release Date: Originator: Australia
File: C:\Program Files\Design Explorer 99 SE\rft\PA50.ddb - HFPwrAmp.prj

1 2 3 4 5 6 7 8