SRK FMA300 User Manual

(ACN 089 050 564 ABN 44 089 050 564)

8 Victoria Grove

Hawthorn East

VIC 3123

Australia

FMA 300 Manual

Safety notice

1 General description

2 Unpacking

3 Installation

4 Operation

4.1 Front view

4.2 Rear view

4.3 Switching on and off

4.4 Setting output power

4.5 Setting channel frequency

4.6 Setting audio gain

4.7 Selecting pre-emphasis and input impedance

4.8 Enabling/disabling stereo

4.9 SCA option

4.10 Protection

4.11 Remote operation

4.12 Audio limiter

4.13 Amplifier metering

5 Maintenance

5.1 Recommended maintenance schedule

6 Circuit description

6.1 Equipment overview

6.2 Amplifier

6.3 Control Board

Drawings

FMA300 Manual

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

Safety note

This equipment uses high voltages internally. Any servicing should be performed by
competent individuals.

Prolonged exposure to high level RF radiation has been shown to pose a health risk.
Whilst the equipment is intrinsically safe, its use in conjunction with an antenna
system may generate large RF fields. Appropriate precautions should be taken by
individuals that habitually work close to the transmitting antenna.

The RF power devices of this equipment employ Beryllium Oxide. This substance is
extremely toxic if pulverised. On no account should any RF power devices be
smashed. Please refer to attached Material Safety Data Sheet for further information.

WARNING

THIS EQUIPMENT IS SUPPLIED WITH A MAINS LEAD INCORPORATING

AN EARTH WIRE. IT IS IMPERATIVE THAT THIS EQUIPMENT IS

CONNECTED TO A MAINS OUTLET THAT HAS AN EARTH. IN

COUNTRIES WHERE EARTHED OUTLETS ARE NOT MANDATORY, IT IS

THE CUSTOMER’S RESPONSIBILITY TO ENSURE THAT THIS

EQUIPMENT IS APPROPRIATELY EARTHED.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

1 GENERAL DESCRIPTION

The FMA300 is a high quality 300W amplifier intended for audio broadcast service in the FM
band.

Its features include:

• Frequency agile.

• Extensive self test and auto diagnostics.

• Rugged design.

• Conservatively rated.

Applications include low power broadcast, narrowcast, community broadcast, rebroadcast for
tunnels, student radio stations and as a driver for high power transmitters.

The FMA300 is designed and built in Australia.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

2 UNPACKING

This section details the way in which the FMA300 should be unpacked upon receipt by the
customer.

Upon receipt the amplifier should be visually inspected to ensure that no damage has
occurred in transit.

Along with the amplifier, the following items should also be present:

• This manual

• Mains lead

The customer should ensure that all items are present and then store them in a safe place.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

3 INSTALLATION

3.1 General

This section describes the installation and infrastructure requirements for the FMA300.
Departure from the instructions contained herein may void any warranty provided by SRK.

3.2 Environmental

The transmitter is intended for indoor use. The transmitter should be protected from rainfall
and direct sunlight, extremes of temperature and humidity and from conditions of high dust
levels. Ambient temperature should be in the range +10°C and +30°C. The transmitter shall
not be operated at altitudes in excess of 3500m above sea level. The transmitter must be
installed on a flat, stable surface. The transmitter must be installed in the upright position.
The transmitter must be installed in a location free from vermin and the ingress of other
animals. The transmitter shall not be installed in locations prone to flooding. All ventilation
orifices must be clear to allow adequate air flow.

3.3 Electrical supply

The electrical supply to the transmitter must be of the voltage, form and frequency described
in the specifications. All electrical wiring must be carried out in accordance with local laws,
standards and regulations. If power supply voltages regularly fall outside specifications then
a voltage regulator must be installed between the supply inlet and the transmitter.

3.4 Earthing

Adequate earthing of the transmitter is vital to ensure long term reliability and user safety.
The electrical supply must be earthed, via the earthing pin of the IEC connector. In countries
where power outlet earthing is merely optional, an earthed outlet must be used. See safety
notice at the front of this manual. A separate, independent, earth is required for the
transmitter/antenna system and must be connected to the earthing point indicated on the rear
of the transmitter. The cable used to connect the earth should be as thick as possible, with 8
AWG being the smallest size acceptable. Where possible, broad earthing band should be
used.

In addition to the earth connection to the transmitter, the outer conductor of the coax feed to
the antenna should be connected to the earth, as indicated below.

The earth itself must be of high quality buried copper, at least 1.5m deep and preferably in
ground that is habitually humid (eg, the base of a gutter down pipe).

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

3.5 Antenna

The antenna load connected to the transmitter must be tuned to minimise reflections. Whilst
the transmitter is designed to withstand high levels of reflection for short periods, continually
high levels of reflected power will degrade the long term reliability of the transmitter.
Operating SWR should be kept to below 1.9:1.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

4 OPERATION

4.1 Front View

Please refer to figure 4.1. The numbers of the following paragraphs refer to the controls
shown in figure 4.1.

1 Auxiliary power indicators

These three LEDs indicate that the +5V,+15V and –15V auxiliary supplies generated within
the amplifier are present.

2 Amplifier meter

Displays various internal parameters of the amplifier, as determined by the meter parameter
panel (5).

3 Alarm indicators

When lit, these indicators show that an alarm or failure condition exists. The cause of any
alarm should be investigated.

4 Air inlets

These inlets allow air to enter the amplifier for cooling and must not be obstructed..

5 Meter parameter panel

This indicates which parameter is currently being displayed on the meter.

6 Meter parameter button

Pressing this button causes the meter to display the next parameter, shown on the meter
parameter panel.

4.2 Rear View.

Please refer to figure 4.2. The numbers of the following paragraphs refer to the controls
shown in figure 4.2

7 RF out

This is the RF output connector and mates with a male N type.

8 Amplifier forced air exhaust

This is the exit port for the forced air cooling. Do not obstruct.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

9 Mains input.

Mains input. 240VAC single phase.

10 Mains circuit breaker

This is the mains circuit breaker for the amplifier. 5A.

11 Mains on-off switch.

Switches the amplifier on and off.

12 Earth stud.

This is the main earth stud. To this must be made the earth connection.

13 Remote control.

Allows remote monitoring of amplifier status. This mates with and 9 way D type plug.

14 RF in

This is the RF input connector and mates with a male N type.

15 Mains neon.

Lights when the unit is switched on and mains is present.

4.3 Switching on and off

The FMA300 is switched on by depressing the power switch (11) to the up position.

If mains voltage is present then the adjacent neon should illuminate.

The fans will start, the auxiliary power indicators will light and the panel meter will indicate
forward output power

Output power is set by the exciter drive power.

Note that there is an interlock function so that if RF is present on the input of the amplifier at
power on, the “HIGH I/P POWER” alarm will light and the amplifier shut down. Ensure that
the RF drive is applied after the amplifier is switched on.

The FMA300 may be switched off at any time by depressing the power switch to the down
position.

4.4 Setting output power

See FMX25 manual. Transmitter power is simply set by exciter power. Use the meter on the
amplifier to monitor forward and reflected RF power.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

4.5 Setting Channel Frequency

See FMX25 manual. Note that it is advisable to reduce RF power to zero before changing
frequency, then ramping power back up at the new frequency.

4.6 Setting audio gain

See FMX25 manual.

4.7 Selecting pre-emphasis and input impedance.

See FMX25 manual.

4.8 Enabling/disabling stereo.

See FMX25 manual.

4.9 SCA option.

See FMX25 manual.

4.10 Protection

The FMA300 incorporates a number of protective features that make it extremely rugged.

If the reflected power from the antenna exceeds 30W then the output RF power will be
automatically reduced to bring the reflected power back to 30W. Under this condition the
FMA300 will continue to function, albeit at a reduced output power, indefinitely until the
reflected power reduces. The amplifier alarm LED “HIGH SWR” will light.

If the temperature of the RF amplifier becomes excessive (>85ºC), then the RF output power
will be reduced to zero until the amplifier temperature falls to an acceptable level. During this
time the amplifier alarm LED “HIGH TEMPERATURE” will light.

If the RF output power exceeds 330W then the amplifier will limit power to about 330W. The
amplifier alarm LED “HIGH O/P POWER” will light.

If the RF input power exceeds about 10W then the amplifier will shut down until the RF power
drops to less than 4W. During this time the amplifier alarm LED “HIGH I/P POWER” will light.

See also the relevant sections of the FMX25 manual.

All error conditions are recoverable automatically once the cause of the error has been
removed. No user intervention is required.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

4.11 Remote operation.

The FMA300 may be monitored remotely via the “TELEMTRY” connector on the rear of the
unit. This is an RS232 standard connection with the following characteristics:

Baud rate: 9600
Data bits: 8
Parity: NONE
Stop bits: 1
Flow control: NONE

The pinout for the DB9 connector is as follows: pin 2, transmit data, pin 3, receive data, pin 5,
common (0V). All other pins are not connected.

The FMA300 responds to the following commands. <CR> indicates the ASCII character 0D
hex. All letters are upper case, spaces (20 hex) are indicated by “_”. All commands must be
terminated by <CR>. Note that a line feed (0A hex) must not be sent before or after <CR>.
After a response is sent, a carriage return, line feed and “>” are sent.

FP?<CR>

Returns forward power in the form XXXW<LF><CR>>. For example:

FP?<CR> (command)
300W<LF><CR> (response from amplifier)

>

Note that for forward powers of 99W and below, the leading zero is replaced with a space

RP?<CR>

Returns reflected power in the form XXXW<LF><CR>>. For example:

RP?<CR> (command)
_00W<LF><CR> (response from amplifier)

>

Note that for reflected powers of 99W and below, the leading zero is replaced with a space.

IP?<CR>

Returns the input power in the form XX.XW<LF><CR>>. For example:

IP?<CR> (command)
_7.5W<LF><CR> (response from amplifier)
>

Note that for input powers of 9.9W and below, the leading zero is replaced with a space.

AT?<CR>

Returns the amplifier heatsink temperature in the form XXXC<LF><CR>>. For example:

AAT?<CR> (command)
_32C<LF><CR> (response from amplifier)

>

Note that for temperatures of 99C and below, the leading zero is replaced with a space.

AI?<CR>

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

Returns amplifier DC current in the form XX.XA<LF><CR>>. For example:

AAI?<CR> (command)
_7.5A<LF><CR> (response from amplifier)
>

Note that for currents of 9.9A and below, the leading zero is replaced with a space.

PT?<CR>

Returns the PSU temperature in the form XXXC<LF><CR>>. For example:

PT?<CR> (command)
_32C<LF><CR> (response from amplifier)
>

Note that for temperatures of 99C and below, the leading zero is replaced with a space.

AV?<CR>

Returns the amplifier DC supply voltage in the form XX.XV<LF><CR>>. For example:

AV?<CR> (command)

50.1V<LF><CR> (response from amplifier)
>

Note that for voltages of 9.9V and below, the leading zero is replaced with a space.

BS?<CR>

Returns the current self test status in the form XXX<LF><CR>>, where X can be either 0 or 1.
A 1 indicates a failure, a 0 indicates a pass. The first byte indicates high temperature, the
second indicates a high input RF condition, the third indicates a high SWR condition and the
fourth indicates a high RF output power condition. For further information consult the section
on protection. For example:

BS?<CR> (command)
0010<LF><CR> (response from amplifier indicating a high SWR condition)

>

or

0000<LF><CR> (response from amplifier indicating no failures)
>

HP?<CR>

Returns a summery of the above commands.

Any data received by the amplifier, other than the commands listed above will generate the
following error string:

Invalid_command.__Send_HP?(CR)_for_command_syntax.<LF><CR>
>

Should it be necessary to make connection to the remote port using cables running external
to the building housing the FMA300, it is recommended that external filtering and transient
protection be installed on these lines.

4.12 Audio limiter

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

See FMX25 manual.

4.13 Amplifier metering.

The FMA300 has extensive metering to allow a number of parameters to be monitored. The
parameter to be measured is selected by depressing the meter selection switch until the
desired parameter is indicated by the array of lamps next to the switch. Each press of the
button selects the next parameter. The following parameters may be measured:

Forward output power.

The forward output power of the amplifier is displayed in watts, 300W maximum.

Reverse output power.

The reverse output power of the amplifier is displayed in watts, 30W maximum.

Forward input power.

The RF input power is displayed in watts, 10.0W maximum .

Amplifier temperature.

The heatsink temperature of the RF amplifier is displayed in degrees centigrade.

PSU temperature.

The heatsink temperature of the PSU is displayed in degrees centigrade.

Amplifier voltage.

The supply voltage of the amplifier is displayed in volts.

Amplifier current

The supply current of the amplifier is displayed in amps, 10.0A maximum.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

5 MAINTENANCE

5.1 Recommended maintenance schedule

The FMA300 will give many years of trouble free service with little attention. However, it is
recommended to clean the fan filters once per year. This can be done by switching off the
transmitter and unclipping the plastic fan guards on the front of the unit. The filters may be
washed gently on clean, warm water and then dried before re-fitting.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

6 CIRCUIT DESCRIPTION

6.1 Equipment Overview

The FMA300 consists of the following sub-assemblies:

• 50V Switch mode PSU

• 300W RF amplifier

• Control board

• Output directional coupler

• Auxiliary PSU

These assemblies are interconnected as per “FMA300 wiring diagram”.

The 50V SMPSU generates 50V at up to 10A for the RF amplifier. It incorporates inrush
current limiting and active power factor correction for excellent power factor. This is an OEM
unit. No attempt should be made to open, modify or repair this unit.

The 300W amplifier assembly is the heart of the amplifier and is centered around a double
MOSFET driven in push-pull class AB.

The RF input to this module is passed through the input directional coupler, thus allowing
monitoring of input power.

The RF output from the amplifier assembly is passed through a filter to remove all harmonics,
and then onto the output directional coupler which allows monitoring of both forward and
reverse output power.

The whole amplifier is controlled and metered by the control board assembly.

The auxiliary PSU generates +5V for the control board.

6.2 Amplifier

Please refer to the appropriate diagram.

RF enters on BNC J2 and is passed to a directional coupler formed by T5. This takes a small
sample of the input power and passes it to R6/9. This voltage is rectified by D1 and then
passed to the control board to allow the input power to be measured.

The RF is then converted to a balanced signal by the action of T12.

The balanced output is passed through 9:1 transmission line transformer formed by T3 and 4.

The RF is then applied differentially to the dual MOSFET, Q1. Bias is also applied at this
point.

The drain loads of Q1 are made up the 4:1 transmission line transformer formed by T1 and 2.

The drains are supplied with DC via this transformer and the decoupling network formed by
C20, FB1, R11, C54 and C31.

The RF output is turned from push-pull to single sided by balun T9 and passed to the output
filter.

Drain current sampling is performed by R13 and fed to the control board for metering.

 2003 SRK Electronics Pty Ltd

FMA 300 Manual

Heatsink temperature is measured by the LM35, which produces a DC output voltage of
10mV/ºC. This voltage is also passed to the control board for metering and protection.

The output filter is a 9th order chebishev that provides at least 40dB of stopband attenuation at
175MHz and at least 60dB of stopband attenuation at 262.5MHz.

The RF output is passed to the output directional coupler via J3.

6.3 Control board

The control board is responsible for all measurement and protection functions. Refer to the
appropriate schematic.

The heart of the controller board is U1, a micro-controller unit. This performs the following
functions:

The analogue voltages representing the forward and reverse powers are digitised on pins 40
and 39. These values are then squared internally to allow the forward and reflected power to
be read on the front panel and via telemetry.

Other analogue parameters are connected to pins 33 to 38 as indicated on the schematic.

The push button used to select which parameter is displayed on the front panel is read on pin

17.

The two error conditions HIGH O/P and HIGH SWR are monitored on pins 20 and 21. These
signals are derived from the comparators U10 and U11. These devices monitor the forward
and reflected power control loops formed by U9B and U9C. If the output of U9B drops to less
than about 5V, this indicates that an over O/P power condition exists. Likewise U9C and a
high SWR condition.

U9B and U9C constantly compare the actual forward and reflected power with thresholds set
by VR3 and VR6 respectively. VR3 is set to the equivalent of about 330W of forward power.
VR6 is set to the equivalent of about 30W of reflected power. Either U9B or U9C can reduce
the bias voltage to the amplifier, thus reducing the output power. In this way, elegant and
seamless power and SWR protection are provided.

The forward and reflected RF voltages from the directional coupler are accurately converted
to DC levels by U7 and U8. U9A and U9D are used to scale these voltages so that 1000W
passing through the directional coupler provides 5.0V to the MCU.

A small value resistor in the supply line of the MOSFET on the amplifier palette generates a
voltages proportional to the drain current. This voltage is amplified and level shifted by U12,
Q2. VR11 is adjusted so that 20.48A of drain current produce 5.0V into the MCU.

Gate bias for the MOSFET is set by VR14.

Telemetry is provided by the on chip USART in the MCU, with U2 providing level shifting to
RS232 levels.

+10V for this board is provided by the small DC-DC converter, U14. U15 generates a
nominal -7V for the analogue circuitry.

The Front panel display is driven in a multiplex format by U1. Q1, 3, 5, 6 and 7 are all
switched on in turn, one at a time. Coincidentally, the appropriate segments are connected to
ground by U1. This happens several hundred times a second, giving the appearance of
constant brightness.

 2003 SRK Electronics Pty Ltd

+5V +15V -15V HIGHI/PPOWER HIGHTEMPERATURE

HIGHO/PSWR

HIGHO/PPOWER

FWDO/PPOWER

REVO/PPOWER

FWDI/PPOWER

AMPTEMP

PSUTEMP

AMPVOLTS

AMPCURRENT

FMA300

300WFMAMPLIFIER

PSU

AMP

+48V

RFIN

RFOUT

Fig4.1FMA300FrontView

4

2

6

5

1

3

4

1 2 3 4

A

B

C

D

4321

D

C

B

A

Title

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1

J2

SCREW

1

J3
SCREW

CABLE COLOUR DESIGNATION

BK BLACK
BR BROWN
R RED
O ORANGE
Y YELLOW
GN GREEN
BL BLUE
V VIOLET
GY GREY
W WHITE
P PINK
BK/R BLACK/RED
GN/Y GREEN/YELLOW

FAN

RF OUTRF IN

RF OUT

50V PSU

AMPLIFIER PALETTE OUPUT

DIRECTIONAL

COUPLER

N TYPEN TYPE

0V +50V

RBK

FMA300 Wiring Diagram

1

J4

SCREW

1

J7

SCREW

1

J9

SCREW

A

N

J11

IECMALE

S1

MAINS ON-OFF

X1
MAINS

L

N

E

V+V-

BR

BL

GN/Y

RG303

N TYPE

CB1
5A

J5
RF IN

RG303

E

N

L

SP-500-48

NES-25-5

12345

6

J8

123456789

1

2

J11

123

J1

162738495

J6

TELEMETRY

CONTROL BOARD

+V

-V

J6

J7

SMB SMB

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

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PA0

40

PA1

39

PA2

38

PA3

37

PA4

36

PA5

35

PA6

34

PA7

33

XTAL2

12

XTAL1

13

RESET

9

AREF

32

PB0

1

PB1

2

PB2

3

PB3

4

PB4

5

PB5

6

PB6

7

PB7

8

PC0

22

PC1

23

PC2

24

PC3

25

PC4

26

PC5

27

PC6

28

PC7

29

PD0

14

PD1

15

PD2

16

PD3

17

PD4

18

PD5

19

PD6

20

PD7

21

+5

10

A+5

30

GND11AGND

31

U1

ATMEGA16(40)

X1

7.3728 MHz

C1

22p

C2

22p

VCC

VCC

C3

100n

C4
100n

FWD VOLTS
REV VOLTS

RXD
TXD

HIGH SWR

R1
10R

HIGH O/P

DA2DY

7

VCC+

8

VCC-

1

GND

4

RA

5

RESP

6

RY

3

U2

SN75155

+10V-9V

C5

100n

C6

100n

Z1

DSS9

Z2

DSS9

Z3

DSS9

RXD

TXD

VCC

987654321

R5
10K

RESET

RESET

1
2
3

J1

RS232

C14
10uF

C15
10uF

C16
10uF

-9V

+10V

C23

100nF

VCC

C17
1uF

1 2
3 4
5 6
7 8
9 10

J2
SPI

VCC

VPOS

1

IREF

2

RF IN

3

PWDN

4

COMM

5

FLTR

6

VRMS

7

SREF

8

U7

AD8361

C10

1nF
J6
FWD

C28

1nF
R17
62R

Z6

DSS9

3

2

1

411

U9A

TL074

5

6

7

U9B

TL074

VR1
10K

R22
4K7

-9V

+10V

R27

100K

R28

100K

C24

100nF

C11

10nF

VCC

VR3

10K

VPOS

1

IREF

2

RF IN

3

PWDN

4

COMM

5

FLTR

6

VRMS

7

SREF

8

U8

AD8361

C12

1nF
J7
REV

C29

1nF
R18
62R

Z7

DSS9

12

13

14

U9D

TL074

10

9

8

U9C

TL074

VR4
10K

R24
4K7

R29

100K

R30

100K

C25

100nF

C13

10nF

VCC

VR6

10K

FWD VOLTS

REV VOLTS

2

3

7

6

5184

U10

LM311

2

3

7

6

5184

U11

LM311

-9V

-9V

+10V

+10V

R32
4K7

R10
10K

+10V

HIGH SWR

HIGH O/P

HIGH O/P
HIGH SWR

1
2
3
4
5
6

J8

Amp A

Z8

DSS9

Z9

DSS9

Z10

DSS9

Z11

DSS9

Z12

DSS9

VCC

TEMP

VR7

10K

IP VOLTS

R33
1K

VR11
47K

D2
12V

Q2

2N5401

R25
4K7

R34
1K

R11

1K

C18
10uF

C26

100nF

+V

R13
10K

AMP CURR

VR10

10K

R31
100K

+V

AMP VOLTS

R2

10R

VCC

VCC

R3

10R

Z19

DSS9

Z20

DSS9

1
2

J11

5V

VR14
10K

D7

1N4148

D8

1N4148

R38
1K

D9 1N4148

U17

4N23

-9V

VCC

R40
220R

BIAS CUT

Z23

DSS9

R4139R

R42

39R

R45
13R

R43

39R

R44

39R

R46
13R

-18dB

-18dB

C21

10nF

C22
10nF

TEST

1

CAP+

2

GND

3

CAP-4VOUT

5

LV

6

OSC

7

V+

8

U15
7660

C31
10uF

C32
10uF

-9V

VCC

C33

4.7pF

C34

4.7pF

C35

15-60pF

C36

15-60pF

3

2

1

84

U12A

LMC6462

D3

1N4148

C19

100pF

C20
33pF

C37
33pF

FMA300 CONTROL BOARD

+V

A7B6C4D2E1F9G10DP

5

3

8

U3
HDSP-5501

A7B6C4D2E1F9G10DP

5

3

8

U4
HDSP-5501

A7B6C4D2E1F9G10DP

5

3

8

U5
HDSP-5501

A7B6C4D2E1F9G10DP

5

3

8

U6
HDSP-5501

R7

68R

R9

68R

R12

68R

R14

68R

R15

68R

R16

68R

R19

68R

R20

68R

LED0

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED0

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED0

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED0

LED1

LED2

LED3

LED4

LED5

LED6

LED7

LED0

LED1

LED2

LED3

LED4

LED5

LED6

LED7

Q3
BC557

Q5
BC557

Q6
BC557

Q7
BC557

R49
1K

R501KR511KR52

1K

VCCVCCVCCVCC

DIGIT1
DIGIT2
DIGIT3
DIGIT4
PARAMETER

PB

IP VOLTS
TEMP
PSU TEMP
AMP VOLTS
AMP CURR

D1D4D5D6D10D11D13

Q1
BC557

VCC

R4

1K

PARAMETER

LED0

LED1

LED2

LED3

LED4

LED5

LED6

D15D16D17D18

R23 270R

R26

270R

R35

270R

R36

270R

VCC

O/P LED

SWR LED
I/P LED

TEMP LED

O/P LED

SWR LED

I/P lED

TEMP LED

R37
270R

R39
1K2

R48
470R

D19

+5V

D20

+15V

D21

-9V

VCC +10V -9V

PB

S1
SELECT PARAMETER

DIGIT1

DIGIT2

DIGIT3

DIGIT4

R6
1K

3 1

2U13

LM35

VCC

PSU TEMP

BIAS CUT

TEST

1

CAP+

2

GND

3

CAP-4VOUT

5

LV

6

OSC

7

V+

8

U14

LT1054

C7
10uF

C8
10uF

D12
1N4148

D14

1N4148

VCC

+10V

+10V

Z4

DSS9

VCC

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

Title

Number RevisionSize

A3

Date: 7-Sep-2010 Sheet of
File: C:\Client98\..\FMA300 amp palette.sch Drawn By:

Q1B

MRF151G

Q1B
MRF151G

T1

RG316

T2

RG316

T9

RG316

T3 RG316

T4 RG316

T12
RG316

C5

470pF

C6

470pF

C16

68pF

R3
10K

R7
10R

C7
1nF

R8
10R

R4
10K

C8
1nF

C18

470pF

C19

470pF

C9
1nF

FB1

VK200

C20

470pF

R11

15R/1W

C30

100nF/100V

C34
10uF/100V

C22

470pF

C23

470pF

C36

39pF

+50V

R13

10mR

R2
75R

C3
1uF

C4
1uF

LM35

+5V

L1

45nH

L3

L4

L5

L6

L7

J3

RF OUT

C38

22pF

C39

22pF

C42

36pF

C43

36pF

C44

36pF

C45

36pF

C50

39pF

C51

39pF

C52

39pF

C53

39pF

C46

36pF

C47

36pF

C48

36pF

C49

36pF

C40

22pF

C41

22pF

L8

5uH

C54

4.7nF

C31

100nF/100V

D2

61V/5W

R22

RFP-10-100

R23

RFP-10-100

R24

RFP-10-100

R25

RFP-10-100

C55

4.7nF

C56

4.7nF

FMA300 AMPLIFIER PALETTE

162738495

J1
DB9

TEMP

+5V

C2
10nF

TEMP

T5

J2
RF IN

R1

100R

R5

100R

R6

100R
R9

100R

D1

5082-2800

R10

100K

C1

1nF

MATERIAL SAFETY DATA SHEET

I PRODUCT IDENTIFICATION

Trade Name: Beryllia Ceramic Chemical Family: Beryllium Compound
Synonym: Beryllium Oxide, Beryllia, Thermalox, Super Beryllia

II HAZARDOUS INGREDIENTS

Constituents OSHA(1995)* ACGIH(1994-95)* CAS # NIOSH/ RTECS #

Beryllium PEL: 0.002 TLV: 0.002 7440-41-7 (Be) DS1750000

Ceiling: 0.005 TLV-STEL: NA 1304-56-8 (BeO) DS4025000
Peak: 0.025

*All concentrations are in mg/m3 (at the concentrations noted above, this constituent may not be visible to the human eye).

ESPI recommends the following good industrial hygiene practice which includes reducing airborne exposures to the lowest
feasible level for all constituents in this product. A leading scientific body recommending occupational standards is the American
Conference of Governmental Industrial Hygienists (ACGIH). The ACGIH recommends standards for all listed substances. The
ACGIH defines a threshold limit value (standards) as follows: “Threshold Limit Values refer to airborne concentrations of substances
and represent conditions under which it is believed that nearly all workers may be repeatedly exposed day after day without adverse
health effects.”

Because of wide variation in individual susceptibility, however, a small percentage of workers may experience discomfort
from some substances at concentrations at or below the threshold limit; a smaller percentage may be affected more seriously by
aggravation of a pre-existing condition or by development of an occupational illness. “Individuals may also be hyper-susceptible or
otherwise unusually responsive to some industrial chemicals because of genetic factors, age, personal habits (smoking, alcohol, or
other drugs), medication, or previous exposures. Such workers may not be adequately protected from adverse health effects from
certain chemicals at concentrations at or below the threshold limits.”

III PHYSICAL DATA

Boiling Point: N/A Sublimes At: N/A
Evaporation Rate: N/A Vapor Density (Air=1): N/A
Freezing Point: N/A Vapor Pressure (mm Hg): N/A
Odor: None % Volatile By Volume: None
pH: N/A Color: White
Physical State: Solid Melting Point (oF): 2547 (BeO)
Radioactivity: N/A Molecular Weight: 25.01 (BeO)
Solubility: None Density (g/cc): 2.86 (BeO)

IV FIRE AND EXPLOSION HAZARDS DATA

Flash Point: N/A Explosive Limits: N/A
Extinguishing Media: N/A

Unusual Fire and Explosion Hazards: N/A
Special Fire Fighting Procedures: If this material becomes airborne as a respirable particulate during a fire situation, pressure-

demand self-contained breathing apparatus must be worn by firefighters or any other persons potentially exposed.

V HEALTH HAZARD INFORMATION

Emergency Overview: If this material is involved in a fire, pressure-demand self-contained breathing apparatus and protective

clothing must be worn by persons potentially exposed to the metal fumes or airborne particulate.

Primary Routes of Exposure:
Inhalation: An exposure to airborne beryllium in excess of the occupational standard can occur when sintering, machining, grinding,

sanding, abrasive cutting, polishing, laser scribing and trimming, chemical etching, crushing, or otherwise abrading the surface of this
material in a manner which generates finely divided particles.

Volatile beryllium hydroxide can be formed when firing solid BeO parts at temperature greater than 900 oC in a moist
atmosphere such as in a hydrogen atmosphere sintering furnace.

Machining operations conducted under a flood of liquid coolant usually require complete hooded containment and local
exhaust ventilation. Openings into the hood must be baffled to prevent release of fast moving particles. The cycling through a
machine of liquid lubricant/coolant containing finely divided beryllium in suspension can result in the concentration building to a
point where the particulate may become airborne during use. The coolant reservoir should be enclosed and ventilated. A coolant
filtering system is recommended.

The Potential for Exposure Also May Occur During Repair or Maintenance Activities on Contaminated Equipment Such as:
furnace rebuilding, maintenance or repair of air cleaning equipment, structural renovation, etc.

Ingestion: There are no known cases of illness resulting from ingestion of this material. Ingestion can occur from hand, clothing,
food, and drink contact with metal dust, fume or powder during hand to mouth activities such as eating, drinking, smoking, nail
biting, etc. This product is not intended for internal consumption. As a standard hygiene practice, hands should be washed before
eating or smoking.

Skin: Skin abrasion may cause irritation. Imbedded material may lead to localized granuloma. The beryllium in this material is in an
insoluble form and does not pose a potential for an allergic dermal response.

Eyes: Injury can result form particulate irritation or mechanical injury to the eyes by dust or particulate. Exposure may result from
direct contact with airborne particulate (chips, dust, or powder) or contact to the eye if contaminated hands or clothing.

Effects of Overexposure:

Acute: (immediate or near-term health effects): The beryllium fraction of this product is insoluble and does not cause acute beryl-

lium disease. The beryllium in this product does not pose a potential for allergic dermal response.

Chronic: (long-term health effects): Inhaling dust fumes containing beryllium may cause serious, chronic lung disease called
Chronic Beryllium Disease (CBD) in some individuals. Over time lung disease can be fatal. Symptoms may include cough, chest
pain, shortness of breath, weight loss, weakness, and fatigue. Long-term effects may include loss of lung function, fibrosis, or
subsequent secondary effects on the heart with eventual permanent impairment. Chronic beryllium disease is a hypersensitivity of
allergic condition in which tissues of the lungs become inflamed with a cellular nodular reaction. This inflammation, sometimes with
accompanying fibrosis, may restrict the exchange of oxygen between the lungs and the bloodstream. This allergic response to
beryllium is limited to susceptible studies and animal experimentation, the International Agency for Research on Cancer and the
National Toxicology Program lists beryllium as a carcinogen.

Medical Conditions Generally Aggravated by Exposure: Persons with impaired pulmonary function, airway diseases, or condi­tions such as asthma, emphysema, chronic bronchitis, etc. may incur further impairment if dust of fume are inhaled. If prior damage
or disease to the neurological (nervous), circulatory, hematologic (blood), or urinary (kidney) systems has occurred, proper screening
or examinations should be conducted on individuals who may be exposed to further risk where handling and use of this material may
cause exposure.

EMERGENCY AND FIRST AID PRODCEDURES:

INHALATION: Breathing difficulty cause by inhalation of dust or fume requires immediate removal to fresh air. There are no

known cases in which a person stopped breathing as a result of exposure. If breathing has stopped, perform artificial respiration and
obtain medical help.

INGESTION: Swallowing beryllium oxide dust can be treated by having the affected person drink large quantities of water and
attempting to induce vomiting, if conscious. Obtain medical help.
SKIN: Skin cuts and abrasions should be treated by standard first aid. Skin contamination can be removed by washing with soap and
water. Obtain medical help if irritation persists. Accidental implementation of this material beneath the skin requires it be removed to
prevent infection or development of a corn-like lesion.
EYES: Dust should be flushed from the eyes with a lot of clean water. Obtain medical help if irritation persists. Contact lenses
should not be worn when working with metal dusts and powders because the contact lens must be removed to provide adequate
treatment.

Treatment of Chronic Beryllium Disease: There is not known treatment which will cure chronic beryllium disease. Prednisone or
the corticosteroids are the most specific treatment available. They are directed at suppressing the immunological reaction and have
been effective in diminishing many signs and symptoms of chronic beryllium disease. In cases where steroid therapy has had only a
partial or minimal effectiveness, other immuno-suppressive agents, such as cyclophospharnide, cyclosporine, or methotrexate, have
been used. These latter agents remain investigational. Further, in view of the potential side effects of all the immuno-suppressive
medications, including steroids such as prednisone, they should be used only under the direct care of a physician. In general, these
medications should be reserved for cases with significant symptoms and/or significant loss of lung function. Other symptomatic
treatment, such as oxygen, inhaled steroids or bronchodilatores, may be used by some physicians and
are effective in selected cases.

The decision about when and with what medication to treat is judgement situation for individual physicians. For the most
part, treatment is reserved for those persons with symptoms and measurable loss of lung function. The value of starting oral steroid
treatment, before signs or symptoms are evident, remains a medically unresolved issue currently under study. Some physicians are
concerned that their patients may develop a resistance to medication if it is started too soon.

The effects of continued low exposure to beryllium are unknown for individuals who are sensitized to beryllium or who have
diagnosis of chronic beryllium disease. This uncertainty leads some physicians to advise a reduction or elimination of further
exposure to beryllium. However, some individuals have developed CBD or have gradually become worse after removal from further
exposure. Others have continued to work in the beryllium industry without any additional, or accelerated, loss of lung function.

VI REACTIVITY DATA

General Reactivity: This material is stable
Incompatibility (Materials to avoid): NA

Hazardous Decomposition Products: None under normal conditions of use
Hazardous Polymerization: Will not occur
Ecological Information: This material is insoluble in water. This material can be recycled.

VII SPILL OR LEAK PROCEDURES

Steps to be Taken in Case Material is Released or Spilled: In solid form this material poses no health or environmental risk. If this

material is in powder or dust form, establish a restricted entry zone based on the severity of the spill. Persons entering the restricted
zone must wear adequate respiratory protection and protective clothing appropriate for the severity of the spill. Cleanup should be
conducted with a vacuum system utilizing a high efficiency particulate air filtration system followed by wet cleaning methods.
Special care must be taken when changing filters on HEPA vacuum cleaners when used to clean up potentially toxic materials.
Caution should be taken to minimize airborne generation of powder or dust and avoid contamination of air and water. Depending
upon the quantity of material released, fine powder or dust spills to the environment may require reporting the National Response
Center at [phone] as well as the State Emergency Response Commission and Local Emergency Planning Committee.

Handling and Storage: Wear gloves when handling to prevent cuts and skin abrasions. Store in a dry area.

Ventilation and Engineering Controls: Whenever possible, the use of local exhaust ventilation or other engineering controls is the

preferred method of controlling exposure to airborne dust and fume. Where utilized, pickups on flexible ventilation lines should be
positioned as close to the source of airborne contamination as possible. Disruption of the airflow in the area of a local exhaust inlet,
such as by a man cooling fan, should be avoided. Ventilation equipment should be checked regularly to ensure it is functioning
properly. Ventilation training is recommended for all users. Ventilation systems designed and installed by qualified professionals.

Respiratory Protection: When potential exposures are above the occupational limits shown in this MSDS, approved respirators must
be used as specified by an Industrial Hygienist of other qualified professional. Respirator users must be medically evaluated to
determine if they are physically capable of wearing a respirator. Quantitative an/or qualitative fit testing and respirator training must
be satisfactorily completed by all personnel prior to respirator use. Users of any style respirator training must be clean shaven on
those areas of the face where the respirator seal contacts the face. Exposure to unknown concentrations of fumes or dusts requires the
wearing of a pressure-demand airline respirator or pressure-demand self-contained breathing apparatus. Pressure-demand airline
respirators are recommended when performing jobs with high potential exposures such as changing filters in a bag house air cleaning
device.

Housekeeping: Vacuum and wet cleaning methods are recommended for dust removal. Be certain to de-energize electrical systems,
as necessary, before beginning wet cleaning. Vacuum cleaners with high efficiency particulate air (HEPA) filters are the recom­mended type. The use of compressed air or brooms to remove dusts should be avoided as such an activity can result in unnecessary
short-term elevated exposures to airborne dusts.

Maintenance: During repair or maintenance activities the potential exists for exposures in excess of the occupational standard.
Under these circumstances, protecting workers can require the use of specific work practices or procedures involving the combined
use of ventilation, wet methods, respiratory protection, decontamination, special protection clothing, and when necessary, restricted
work zones.

Other Protective Equipment: No special protective equipment or clothing is requires when handling solid forms. Protective over
garments or work clothing must be worn by persons who may become contaminated with dusts, fumes, or powders during activities
such as machining, furnace rebuilding, air cleaning equipment filter changes, maintenance, etc. Contaminated work clothing and over
garments must be managed in such a manner so as to prevent secondary exposure to persons such as laundry operators and to prevent
contamination to personal clothing. Never use compressed air to clean work clothing.

Protective Gloves: Wear gloves to prevent cuts and skin abrasions during handling.
Eye Protection: Wear safety glasses, goggles, or face shield when risk of eye injury is present, particularly during machining,

grinding, etc.

Recommended Monitoring Procedures:

Environmental Surveillance: Exposure to airborne materials should be determined by having air samples taken in the employee

breathing zone, work area, and department. The frequency and type of air sampling should be as specified by an Industrial Hygienist
or other qualified professional. Air sample results should be make available to employees.

Medical Surveillance: Persons exposed to airborne concentrations of this material should be included in a periodic medical surveil­lance program. The program should include examination of the skin and respiratory systems. Non-specific findings of skin rash, skin
granulomata, or respiratory signs or symptoms may indicate a reaction to this material. A minimum medical surveillance program
should include (1) skin examination, (2) respiratory history, (3) auscultation of the lungs, (4) spirometry (FVC and FEV), and (5)
periodic chest x-ray. In addition, a specialized, specific, immunological blood test, the beryllium blood lymphocyte proliferation test
(BLPT), is available ( on a limited basis to assist in the diagnosis) to screen beryllium-exposed persons for beryllium reactions. Note:
It should be recognized that BLPT has limited sensitivity for chronic beryllium disease. Individuals who have an abnormal BLPT are
normally referred to a lung specialist for additional specific tests to determine if chronic beryllium disease is present.

VIII SPECIAL PROTECTION INFORMATION

Transport Information: There are nor U.S. Department of Transportation hazardous material regulations which apply to the

packaging and labeling of this product as shipped by ESPI. Hazard Communication regulations of the U.S. Occupational Safety and
Health Administration require that this material be labeled.

Regulatory Information: OSHA Hazard Communications Standard, 29 CFR 1910.1200: Beryllium is considered a hazardous
ingredient.
Ambient Air Emissions: Beryllium-containing materials are subject to the National Emission Standard for Beryllium as promulgated
by EPA (40 CFR 61, Subpart (C). The National Emission Standard for beryllium is 0.01 micrograms per cubic meter (30 day
average) in ambient air for those production facilities which have been qualified to be regulated through ambient air monitoring.
Other facilities must meet a 10 gram per 24-hour total site emission limit. Most process air emission sources will require an air permit
from a local and/or state air pollution control agency. The use of air cleaning equipment may be necessary to achieve a permissible
emission. Tempered makeup air should be provided to prevent excessive negative pressure in a building. Direct recycling of cleaned
process exhaust air is not recommended. Plant exhausts should be located so as not to re-enter the plant through makeup air or other
inlets. Regular maintenance and inspection of air cleaning equipment and monitoring of operating parameters is recommended to
ensure adequate efficiency is maintained.

Wastewater: Wastewater regulations can vary considerably. Contact your local and state governments to determine their require­ments.

Toxic Substances Control Act: Beryllium is listed on the TSCA Chemical Substance Inventory of Existing Chemical Substances.

Sara Title III Reporting Requirements: On February 16, 1988 the U.S. Environmental Protection Agency (EPA) issued a final rule

that implements the requirements of the Superfund Amendments and Re-authorization Act (SARA) Title III, Section 313 (53) Federal
Register 4525. Title III is the portion of SARA concerning reporting on specific chemicals which are manufactured, processed or
used at certain U.S. Industrial facilities.

Beryllium is reportable under Section 313. The Chemical Abstracts Services number is provided in this MSDS. SARA Title Hotline
1-800-535-0202 or 202-555-1411

This MSDS has been revised following the guidelines outlined in the American National Standard for Hazardous Chemicals Z400.1­1993 “Material Safety Data Sheets-Preparation.”

IX SPECIAL PRECAUTIONS

Disposal Considerations:

Byproduct Recycling: When recycled (used in a process to recover metals), this material is not classified as hazardous waste under

federal law. Dusty or dust-like materials should be sealed inside two plastic bags, placed in a DOT approved container, and appropri­ately labeled.

Solid Waste Management: When spent products are declared solid wastes (no longer recyclable), they must be labeled, managed
and disposed of, in accordance with federal, state and local requirements. This material is not classified a hazardous waste under
federal law.

Prepared by: S. Dierks
Dated: January 1996