Codan Radio Communications VT-4-150 VT-4x150 VHF Transmitter User Manual IM21 VT3150AMP 1 VHF Amplif
Codan Radio Communications VT-4x150 VHF Transmitter IM21 VT3150AMP 1 VHF Amplif
manual
DANIELS
ELECTRONICS
LTD.
®
MT-3
RADIO
SYSTEMS
VHF AMPLIFIER
INSTRUCTION MANUAL
VT-3
132 - 174 MHz
Covers models:
VT-3/150 Amplifier
Copyright © 1998
Daniels
Electronics
Ltd.
All
rights reserved. No part of this
publication
may be
reproduced, stored in a
retrieval
system or
transmitted
in any form or by any means,
electronic,
mechanical,
photocopying, recording or otherwise, without the prior written consent of
Daniels
Electronics
Ltd.
Issue: 1 Previous Issue: N/A
Issue
Date:
May 98 Previous Issue
Date:
N/A
Daniels
Electronics
Ltd.
Printing
Date:
May 98
Victoria,
B.C.
Part No.:
IM21-VT3150AMP
PRINTED IN
CANADA
DE
DANIELS
ELECTRONICS
ii
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
Reviewed By:
Quality
Assurance:
_________________
Name Signature
Date
NOTE:
The
user's
authority
to op
erate
this
equipment
could be revoked through any
changes or
modifications
not expressly approved by
Daniels
Electronics
Ltd.
The design of this
equipment
is subject to change due to continuous
development. This
equipment
may
incorporate
minor changes in
detail
from the
information
contained
in this manual.
DE
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ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
iii
TABLE OF CONTENTS
Page
1 GENERAL....................................................................................... 1-1
1.1
Introduction
............................................................................. 1-1
1.2
Performance
Specification
............................................................ 1-1
2
THEORY OF OPERATION
................................................................... 2-1
2.1
Amplifier
Operation
.................................................................... 2-1
2.2 Power
Requirements
................................................................... 2-1
2.3 RF
Circuitry
............................................................................ 2-2
2.3.1
VT-3/150
Lowpass
Filter
.................................................... 2-2
2.4 Power Control
Circuitry
............................................................... 2-2
2.5 Power Sensing
Circuitry
.............................................................. 2-3
2.5.1
Output
Power Sense.......................................................... 2-3
2.5.2
VSWR Sense.................................................................. 2-3
2.5.3
VSWR
Overload
.............................................................. 2-4
3
VT-3/150 AMPLIFIER ALIGNMENT
...................................................... 3-1
3.1 General.................................................................................. 3-1
3.2 Repair Note............................................................................. 3-1
3.3
Recommended
Test
Equipment
List................................................. 3-1
3.4 Printed
Circuitboard
Numbering
Convention
....................................... 3-2
3.5 Standard Factory Settings and Jumper
Configuration
............................. 3-2
3.6
VT-3/150
Amplifier
Alignment
....................................................... 3-2
3.6.1
General......................................................................... 3-2
3.6.2
VT-3/150
Amplifier
Adjustment
............................................. 3-3
3.6.2.1
General Set-Up....................................................... 3-3
3.6.2.2
Output
Power
Alarm
(Forward Power) ........................... 3-4
3.6.2.3
Output
Power......................................................... 3-5
3.6.2.4
Antenna
VSWR
Alarm
(Reverse Power).......................... 3-5
3.6.2.5
Antenna
VSWR
Overload
........................................... 3-6
3.6.2.6
Procedure
Verification
............................................... 3-6
4
ILLUSTRATIONS AND SCHEMATIC DIAGRAMS
.................................... 4-1
4.1
VT-3/150
VHF
Amplifier
Component
Layout...................................... 4-2
4.2
VT-3/150
VHF
Amplifier
Schematic
Diagram
...................................... 4-3
4.3
VT-3/150
VHF Lowpass
Filter
Component
Layout............................... 4-5
4.4
VT-3/150
VHF Lowpass
Filter
Schematic
Diagram
............................... 4-5
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VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
5 PARTS LISTS...................................................................................5-1
5.1
VT-3/150
Amplifier
Electrical
Parts List.............................................5-1
5.2
VT-3/150
Low Pass
Filter
Electrical
Parts List.....................................5-3
5.3
VT-3/150
Amplifier
Mechanical
Parts List..........................................5-3
6
REVISION HISTORY
..........................................................................6-1
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ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
1-1
1
1
GENERAL
1.1 Introduction
The
VT-3/150
Amplifier
provides the final stage of RF
amplification
and
filtering
for the
entire
VHF
Transmitter
VT-3 132 - 174 MHz family. The
amplifier
has two
distinct
frequency ranges:
132 to 150 MHz, and 150 to 174 MHz with
continuously
adjustable
2.0 to 8.0 Watts output
power.
The
VT-3/150
Amplifier
is housed in a
machined
aluminum
case that ensures
optimum
RF
shielding, provides a good
ground,
and also acts as a heatsink.
Additionally,
the
VT-3/150
Amplifier
is equipped with output power and VSWR sensing lines
which can be
individually
configured as open
collector
or
linear
outputs. The
internal
VSWR
sensor protects the
amplifier
from high
antenna
VSWR by
approximately
halving the amplifier's
RF gain when a VSWR overload
condition
is present.
Output
filtering
for the
VT-3/150
Amplifier
is provided by the
VT-3/150
Lowpass
Filter
Board.
The lowpass
filter
assembly is mounted in a
separate
compartment
of the
amplifier
case in order to
provided
maximum
attenuation
of
harmonic
and other spurious signals.
Refer to Section 4 for the VT-3 132 - 174 MHz VHF
amplifier
and lowpass
filter
component
layouts and
schematic
diagrams
1.2
Performance Specification
Type: MT-3 series VHF
Amplifier
module.
Compatibility:
MT-3 series
Transmitter
Main
Board.
Frequency Range: 132 MHz to 150 MHz or 150 MHz to 174 MHz.
RF Power
Output:
adjustable
2.0 to 8.0 Watts
RF power Input:
nominal
level
adjustable
from +4 dBm to +10 dBm,
held within +/- 2 dB of nominal.
Ouput
Impedance
and
VSWR:
50 Ω, Type N
connector;
3:1 max. VSWR.
Input
/Output
Isolation:
> 60 dB
Duty
Cycle:
100%: Continuous
operation
from -40˚ C to
+60˚C.
Harmonic Emissions: Less than -80 dBc .
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1-2
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
2
Transmitter
Mismatch
Protection:
20:1 VSWR at all phase angles.
Transmitter
Alarm:
Forward power sense and reverse
VSWR;
- open
collector
output
(separate
or
'
OR'ed
configuration);
-
linear
output
(separate
lines only).
Operating
Temperature
Range: -30˚ C to +60˚ C,
optional
-40˚ C
temperature
test.
Operating
Humidity:
95% RH (non-condensing) at +25˚ C.
Operating
Voltage:
+13.8
Vdc Nominal (range +11 to +16 Vdc),
+9.5
Vdc Regulated.
Transmit
Current: 0.7 Amp
typical
; 1.1 Amp
maximum
Amplifier
Standby Current: less than 0.5 mA.
Amplifier
Enable:
Active
to
ground.
Amplifier
Enable
Response:
typically
overdamped, rising to within 90% of full power
within 5 msec;
maximum
(
underdamped)
overshoot of
30%.
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VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
2-1
1
2
THEORY OF OPERATION
2.1
Amplifier Operation
A power control
circuit
monitors the RF output power of
amplifier
U4 and keeps the power
constant. The output power from the high power
amplifier
will change as the
unregulated
+13.8
Vdc supply varies. Note that the frequency band does not change how the
amplifier
operates;
it
only changes a few
component
values in the RF circuitry.
Power for the
VT-3/150
Amplifier
is provided from the MT-3
Transmitter
Board. The
+13.8
Vdc
supply (if required) is
continuously
connected
to the
amplifier;
whereas, the
+9.5
Vdc supply is
always switched by the transmitter's PTT circuitry. The
VT-3/150
Amplifier
will not use any
power from the
+13.8
Vdc supply
until
the amplifier's
+9.5
Vdc line is switched on and an RF
input signal is present. The synthesizer or crystal control module controls the
+9.5
Vdc to the
amplifier's
circuitry;
switching it on by grounding the amplifier's input
enable
line. The
synthesizer or crystal control module will ground the input
enable
line only when the RF signal
from the synthesizer or crystal control module is phase locked. This prevents unwanted spurious
emissions during
transmitter
start-up. A
typical
start-up sequence is shown below:
1) the
transmitter
is keyed on
(+13.8
Vdc is always present)
2)
+9.5
Vdc is switched on by the PTT
circuitry
and the synthesizer
or crystal control module PTT line is pulled low
3) an RF signal is output to the
amplifier
4) the
ampli
fier's
input
enable
line is
activated
5) the
amplifier
outputs RF power
2.2
Power Requirements
Typical
current
requirements
for the
VT-3/150
Amplifier
at
different
power levels are given in the
Table
2-3 below. The current drawn from the
+9.5
Vdc supply should never
exceed
1.2 Amps
and the current drawn from the
+13.8
Vdc supply should never
exceed
1.5 Amps.
Table 2-1
VT-3/150 Amplifier Current Consumption
Output
Power
+9.5
Vdc
Supply Current
+13.8
Vdc
Supply Current
2.0 W 0.64 A 0.51 A
4.0 W 0.79 A 0.75 A
6.0 W 0.89 A 0.93 A
8.0 W 1.04 A 1.10 A
Note: Current consumption measured at 153 MHz
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ELECTRONICS
2-2
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
2
2.3 RF Circuitry
The RF
circuitry
consists of several blocks: a 7 dB input pad (R1, R2, and R3), an RF
amplifier
module
(U4),
an output power boosting transistor (Q7), three
directional
couplers (TL1, TL3, and
TL4), and the
VT-3/150
Lowpass Filter. The heart of the
VT-3/150
Amplifier
is RF
amplifier
module
U4.
The output of U4 is further
amplified
by Q1 to a
maximum
of 8.0 Watts at the
antenna
connector. The frequency band of the
VT-3/150
Amplifier
is
determined
by the
operating
frequency
range of the RF
amplifier
module
U4.
Directional
couplers (TL1, TL3, and TL4) are used to
sample forward and reverse
power.
The sampled power is used by the sensing and power control
circuits
to control the amplifier's operation. The final step in the RF path is output
filtering
and, as
mentioned
earlier, this is done by the
VT-3/150
Lowpass Filter.
2.3.1
VT-3/150 Lowpass Filter
The
VT-3/150
Lowpass
Filter
is a 50 ohm, 9 pole,
reciprocal
filter
with a 3 dB cutoff frequency of
approximately
185 MHz. The lowpass
filter
assembly
attenuates
the desired
signal's
harmonics as
well as any other out-of-band emissions so that a
'clean'
RF signal is output to the
antenna
connector.
2.4
Power Control Circuitry
The
VT-3/150
Amplifier
employs a closed loop power control which uses a sample of the forward
RF power to control the gain of RF
amplifier
U4.
Op-amp
U1b compares the sampled RF
voltage
to the output power
setpoint
and
generates
an error signal which Q3 uses to control the
voltage
on
U4's
gain control pin. The output power
setpoint
is
determined
by R7, the
Output
Power
Adjust
potentiometer.
The forward power is sampled by TL1, D5, C14, R13, L6, R12, and C15. The power control
circuitry
keeps the output power of U4 constant.
Therefore
the amplifier's output power will
fluctuate
with
variations
in the
+13.8
Vdc supply voltage.
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ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
2-3
3
2.5
Power Sensing Circuitry
The
VT-3/150
Amplifier
is equipped with output power and VSWR sensing lines which can be
individually
configured as open
collector
or
linear
outputs. In open
collector
configuration, the
output is
active
low, that is, when a fail
condition
is
detected
(not enough output power or too high
antenna
VSWR) the open
collector
transistor is turned on. In
linear
configuration, a
voltage
proportional
to the sensed output power or
antenna
VSWR is output.
Both the
Output
Power
Alarm
setpoint
and the VSWR
Alarm
setpoint
are
individually
adjustable;
however, the
Output
Power Alarm
setpoint
must always be adjusted before the VSWR
Alarm
setpoint. This is because the
Output
Power
Alarm
setpoint
is used as a
reference
by the VSWR
Alarm
circuitry.
2.5.1
Output Power Sense
The output power sense
circuitry
uses
directional
coupler TL2 to sample some of the forward
power.
The sampled power is
rectified
by diode D6 and
capacitor
C20 and then
amplified
by
op-amp
U3b.
Op-amp
U3b's
amplification
is
controlled
by R21, the output power
alarm
adjust
potentiometer.
The
amplified
voltage
is then output
directly
in
linear
operation
(JU1 installed, JU2
not
installed)
or
compared
by op-amp U1a which then drives transistors Q4 and Q3 for open
collector
operation
(JU1 not installed, JU2 installed).
In open
collector
configuration, Q3 (the open
collector
output transistor) is turned on when an
alarm
condition
occurs. The
adjustment
range for the output power
alarm
can vary depending on
the
setting
of R21 (the
Output
Power
Alarm
Adjust
potentiometer).
2.5.2
VSWR Sense
The VSWR sense
circuitr
y uses
directional
coupler TL3 to sample some of the power
reflected
from the
antenna
terminal. The
reflected
power is
rectified
by diode D7 and
capacitor
C25 and then
amplified
by op-amp
U2b.
Op-amp
U2b's
amplification
is
controlled
by R36, the VSWR
Alarm
Adjust
potentiometer.
The
amplified
voltage
is then output
directly
in
linear
operation
(JU4
installed, JU3 not
installed)
or
compared
to the output power
alarm
setpoint
by op-amp U3a which
then drives transistor Q5 for open
collector
operation
(JU4 not installed, JU3 installed).
In open
collector
configuration, Q5 (the open
collector
output transistor) is turned on when an
alarm
condition
occurs. The
adjustment
range for the VSWR
Alarm
can depending on the
setting
of R36 (the VSWR
Alarm
Adjust
potentiometer).
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ELECTRONICS
2-4
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
4
2.5.3 VSWR Overload
The VSWR overload
circuit
protects the
VT-3/150
Amplifier
from excessive
antenna
VSWR by
reducing the amplifier's gain (output power) when an overload
condition
occurs. The VSWR
overload
circuit
(R14, R37, R39, R40,
U2a,
and Q6) is an extension of the VSWR sense
circuit
and operates the same as the VSWR sense open
collector
circuit
. The VSWR
Overload
Adjust
potentiometer
(R37) reduces the
voltage
level
of the VSWR
Alarm
Setpoint. The
voltage
set by
R37 is the
compared
to the output power
alarm
setpoint
by op-amp U2a which then drives
transistor Q6. When transistor Q6 turns on,
signaling
an overload condition, resistor R14 is
grounded which reduces the output power setpoint. Reducing the output power
setpoint
lowers the
VT-3/150
Amplifier's gain and protects the
amplifiers
from excessive current draw resulting from
high
antenna
VSWR.
The VSWR overload circuit's range of
adjustment
depends on the
setting
of the VSWR
Alarm
Adjust
potentiometer
(R36).
The VSWR overload transistor Q6 can be
activated
at the same point
at which the VSWR
alarm
becomes
active
or the VSWR overload
circuit
can be disabled by turning
R37
completely
counterclockwise.
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VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
3-1
1
3
VT-3/150 AMPLIFIER ALIGNMENT
3.1
General
Connections to the power supply, alarm and
transmit
enable
lines (ENA), are
clearly
marked on the
amplifier
case. The
amplifier
is
enabled
when the
enable
line (ENA) is grounded.
If the
amplifier
is
installed
in the transmitter,
alignment
is
simplified
by using an SR-3 Subrack,
SM-3 System Monitor, and RF
extender
cable
to provide
transmitter
power and signal
interconnection
(see the
Transmitter
Main
Board
Manual
for details). For
complete
transmitter
alignment, the
Transmitter
Main
Board, Synthesizer,
Amplifier,
and Audio Processor should be
tuned in the
aforementioned
order. Please refer the corresponding manuals for each module.
If the input RF
level
is not changed,
adjustments
to the output power and
alarm
thresholds may be
made without removing the
amplifier
cover.
However,
in the case of a
complete
amplifier
alignment, the
amplifier
should be
separated
from the
Transmitter
Main
Board and the
amplifier
cover removed to expose all
amplifier
circuitry.
All
jumpers and test points are
clearly
marked.
3.2 Repair Note
The
VT-3/150
Amplifier
is
mainly
made up of surface mount devices which should not be removed
or
replaced
using an ordinary soldering iron.
Removal
and
replacement
of surface mount
components should be performed only with
specifically
designed surface mount rework and repair
stations
complete
with
ElectroStatic
Dissipative
(ESD) protection.
When removing Surface
Mount
Solder
Jumpers,
it is
recommended
to use solder braid in
place
of
manual
vacuum type desoldering tools when removing jumpers. This will help prevent
damage
to
the circuitboards.
3.3 Recommended Test Equipment List
Alignment
of the
transmitter
requires the following test
equipment
or its equivalent.
Dual
Power Supply:
Regulated
+9.5
Vdc at 0.1 A.
Regulated
+13.8
Vdc at 2 A - Topward TPS-4000
Oscilloscope
/
Multimeter:
Fluke 97
Scopemeter
Current
Meter:
Fluke 75
multimeter
Radio
communications
test set :
Marconi
Instruments 2955R
VSWR 3:1
mismatch
load:
JFW 50T-035-3.0:1
coaxial
test
cable
set three 50 Ω cables of
incremental
length 20 to 40 cm
Alignment
Tool:
Johanson 4192
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3-2
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
2
It is
recommended
that the radio
communications
test set be frequency locked to an
external
reference
(WWVH,
GPS,
Loran C) so that the high
stability
oscillator
may be
accurately
set to
within its ±1 ppm frequency tolerance.
3.4
Printed Circuitboard Numbering Convention
To ease
troubleshooting
and
maintenance
procedures,
Daniels
Electronics
Limited
has adopted a
printed
circuitboard
(PCB) numbering
convention
in which the last two digits of the
circuitboard
number represent the
circuitboard
version. For
example:
• PCB number 43-9120
10
indicates
circuitboard
version 1.0;
• PCB number 50002-
02
indicates
circuitboard
version
2.0.
All
PCB's
manufactured
by
Daniels
Electronics
are
identified
by one of the above conventions.
3.5
Standard Factory Settings and Jumper Configuration
The
VT-3/150
Amplifier
is factory configured as follows:
• Open
collector
configuration
for
Output
Power Alarm.
• Open
collector
configuration
for
Antenna
VSWR Alarm.
The corresponding jumper settings are:
• Jumper JU1: not
installed
Output
power
alarm
-
linear
output
• Jumper JU2:
installed
Output
power
alarm
- open
collector
output
• Jumper JU3:
installed
Antenna
VSWR
alarm
- open
collector
output
• Jumper JU4: not
installed
Antenna
VSWR
alarm
-
linear
output
3.6 VT-3/150 Amplifier
Alignment
3.6.1 G
eneral
The
VT-3/150
Amplifier
is a frequency
sensitive
module that is factory assembled to
operate
in one
of two frequency bands: 132 to 150 MHz or 150 to 174 MHz. The
amplifier
requires 7 dBm of
input power and is
continuously
adjustable
over the its power range of 2.0 to 8.0 Watts. The
VT-3/150
Amplifier
provides
Output
Power and
Antenna
VSWR
Alarm
outputs which can be
configured for open
collector
output or
linear
operation. The amplifier's output power
level
and
alarm
levels can be set without
detaching
the
amplifier
from the
transmitter
board.
However,
to
change the
configuration
of the output power
alarm
or the
Antenna
VSWR alarm, the VT-3/150
Amplifier
must be
detached
from the MT-3
Transmitter
Board. Refer to page 4-2
"VT-3/150
VHF
Amplifier
Component
Layout" for the
location
of solder jumpers JU1 to
JU4.
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ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
3-3
3
3.6.2
VT-3/150 A
mplifier
Adjustment
The
Amplifier
alignment
consists of two
adjustment
procedures; (i) a
general
set up (section
3.6.2.1)
procedure which sets up the proper bias
conditions
for the RF transistors and (ii) the RF
threshold
adjustments
which set up the desired
alarm
threshold levels as well as the RF output
power.
The
general
alignment
procedure is required following major repair operations, changes in
RF input levels or large changes in
operating
frequency
(greater
than ± 1.0 MHz).
The RF output and
alarm
threshold
level
adjustments
are more easily
accessible
so that fine
adjustments
can be made in the field.
Depending
on user requirements, the RF
alarm
threshold
levels should be
checked
whenever a
significant
change in
operating
frequency (± 0.5 MHz) is
made. As the
antenna
VSWR
alarm
is
dependent
on the output power alarm, the output power
alarm
should always be set first. The order of
adjustment
should be:
1) Set the desired output power
alarm
level
(section
3.6.2.2).
2) Set the output power (section
3.6.2.3).
3) Set the desired
Antenna
VSWR
alarm
level
(section
3.6.2.4).
4) Set the desired overload
condition
level
(section
3.6.2.5).
Details
for the
alignment
steps are
outlined
below.
3.6.2.1
General Set-Up
All
of the setup steps
detailed
below are performed at the factory as part of the
initial
Transmitter
alignment. A
general
realignment
of the
Amplifier
Module
will be required
under the following
conditions:
(i) the
nominal
RF input power
applied
to the
amplifier
is changed from that
which the
amplifier
was
intially
set up
for,
and
(ii) components,
particularly
the RF transistors Q1 and Q2, are
replaced
during a repair operation.
1. Connect the transmitter's
antenna
output
connector
to the type N input of the radio
communications
test set through a short section of low loss 50 Ω
coaxial
cable.
2. Turn all four (4) of the
adjustment
pot
entiometers
(R7, R21, R36, and R37) fully
counterclockwise.
3. Turn on the power to the transmitter.
DE
DANIELS
ELECTRONICS
3-4
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
4
4.
Monitor
the
+9.5
Vdc and 13.8 Vdc supply current and adjust R7, the output power
adjustment, so that
approximately
1 Amp is being drawn on the
+9.5
Vdc line and
1.3 Amps or less is being drawn on the 13.8 Vdc line. This should produce
approximately
8 Watts.
5. If only a 6 or 7 watt output is obtained, adjust the low pass
filter
coil pairs L2/L3 and
L1/L4 to obtain 8 watts.
3.6.2.2 Output Power Alarm
(Forward Power)
Open
Collector
Output
*
note:
the output power
alarm
output is factory configured as an open
collector
output
so a pull-up resistor may be required on
transmitter
pin B26 if one is not
already
present.
1.
Adjust
R7, the output power adjustment, to the output power at which the
Output
Power
Alarm
is to be
activated.
2.
Monitor
transmitter
pin B26, the
Output
Power
Alarm
line, and slowly turn R21, the
output power
alarm
adjustment, clockwise
until
pin B26 goes low. The
alarm
is now
set for the current output power of the transmitter.
Linear
Output
1. Open the
amplifier
case to disable (open
circuit)
jumper JU2 and
enable
(short)
jumper
JU1.
2.
Monitor
transmitter
pin B26 with a voltmeter.
3.
Adjust
R7, the output power adjustment, for full
transmitter
output
power.
4.
Adjust
R21, the output power
alarm
adjustment, so that the
voltmeter
indicates
+7.5
Vdc for full
transmitter
output
power.
5. Turn R7, the output power adjustment, fully counterclockwise. The
voltmeter
should
read
approximately
+3 Vdc.
6.
Disconnect
the voltmeter.
DE
DANIELS
ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
3-5
5
3.6.2.3 Output Power
1. Turn R7, the output power adjustment, clockwise to the desired
transmitter
output
power.
3.6.2.4 Antenna VSWR Alarm (Reverse Power)
Open
Collector
Output
*
note:
the
antenna
VSWR
alarm
output is factory configured as an open
collector
output so a pull-up resistor may be required on
transmitter
pin Z26 if one is not
already
present. The output power
alarm
must be set first before the
antenna
VSWR
alarm
can be set.
1. Dis
connect
the radio
communications
test and
terminate
the
transmitter
with the 3:1
mismatch
load.
2.
Monitor
pin Z26, the
Antenna
VSWR
Alarm
line, and turn R36 fully
counterclockwise. Pin Z26 should be high. Slowly turn R36 clockwise
until
pin
Z26 is pulled low. Put the 50 ohm load back on again, Pin Z26 should go high. The
reverse power trip point is now set for a VSWR of 3:1.
Linear
Output
1. Open the
amplifier
case to disable (open
circuit)
jumper JU3 and
enable
(short)
jumper
JU4.
2.
Monitor
trans
mitter
pin Z26 with a voltmeter.
3.
Disconnect
the radio
communications
test set and
terminate
the
transmitter
with the
3:1
mismatch
load.
4.
Adjust
R36, the VSWR
alarm
adjustment, so that the
voltmeter
indicates
+5 Vdc for a
3:1 mismatch.
5. Put the 50 ohm load back on again. The
voltmeter
should read
approximately
0 Vdc.
6.
Disconnect
the voltmeter.
DE
DANIELS
ELECTRONICS
3-6
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
6
3.6.2.5 Antenna VSWR Overload
1.
Disconnect
the radio
communications
test set and so that the
amplifier
is
terminated
with an open circuit.
2.
Monito
r the current from the
+9.5
Vdc supply.
3.
Adjust
R37, the VSWR overload adjustment, clockwise
until
a
noticeable
drop in the
+9.5
Vdc current occurs.
4.
Reconnect
the radio
communications
test set and, the
+9.5
Vdc current should return
to the previous level.
3.6.2.6
Procedure Verification
1.
Verify
that the current drawn from the
+13.8
Vdc supply is less than 1.5 A and from
the
+9.5
Vdc supply is less than 1.2 A when
transmitting
full RF output power (8
Watts).
2. Turn off the power to the
transmitt
er.
DE DANIELS
ELECTRONICS
4-1 VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
4 ILLUSTRATIONS AND SCHEMATIC DIAGRAMS
This Page Intentionally Left Blank
DEFAULT JUMPER
VICTORIA B.C .
DATE.:
DWG No:
TITLE:
DDANIELS
ELECTRONICS
BOARD No.:
DWG REV DATE:
43-932611MARCH 8, 1994
COMPONENT NOT INSTALLED
VT-3/150 AMPLIFIER SM LAYOUT (LOW POWER)
9326AS1
49R9
49R9
150p
49K9
1.5uH
49K9
10n
10n
100n 49K9
49K9
1K
10n
10K
10K
100n
10K
10n
1.5uH
33172
33172
27K4
1K
1K
49K9
10K
1K
49K9
49K9
10n
10n
10K
10nF
10K
MC
49K9
10K
10K
27K4
1K
1K
4K53
10K
27K4
100n
10n
1nF
30R1
0.18uH
0.18uH
FB1
0.18uH
1nF
100nF
18nF
18nF
18nF
18nF
4.7uF
10nF
BYD17J
100nF
49K9
MMBD701
MMBD701
BC817-25
BC817-25
MBZ5233B
PZT2222A
PZT2222A
50K
50K
50K
50K
D6
C20
R18
L6
R19
C21
C19
C18
R20
C22
R22
R23
R24
R32
R44
C24
R43
R42
R35
R34
U2
U3
R40
C26
TL2
TL3
R16
R17
D7
C25
R33
L7
R39
R41
Q6
R26
R27
R30
R11
R9
C12
C15
C17
Q4
R31
R28 R29
U1
R10
R5
C13
C14
D1
R6
R8
R7
R25
Q3Q5
R38
R37
R36
R21
33172
R1
C1
C2
C3
C4
L1
L3
L2
C9
18nF
Q2
D5P06V
R4
D3
D4
C6
C5
MC
MC
C10
C7
C8
C11
JU1
JU2
JU3
JU4 3K48
221K
C23
10n
R14 10K
150p
49K9
VT-3/150 AMPLIFIER SM DESIGNATION (LOW POWER)
9326AS2
BYD17J
R2
R3
178R
178R
JU5
VT-3/150 AMPLIFIER SM LAYOUT (HIGH POWER)
9326AS3
100nF
10nF
SELECT
SELECT
1nF
SELECT
SELECT
49K9
49R9 150pF
49K9
1.5uH
MMBD701
SELECT
SELECT
D5
C16
R15
R13
L5
C31 C33
C29
C37
C38
R12
TL1
C27
C28
C32
C34
VT-3/150 AMPLIFIER SM DESIGNATION (HIGH POWER)
9326AS4
SELECT
C36
COMPONENT INSTALLED ON BOTTOM OF BOARD
COMPONENT MOUNTED ON CASE
M2.5 x 6 SCREW
M3 x 8 SCREW
VT-3/150 AMPLIFIER TH LAYOUT (LOW POWER)
M3 x 8 CAP SOCK SCREW
NOTE Q1 MOUNTED ON CASE WITH LEADS
INSERTED TO BOTTOM OF BOARD
150nHL4
TL2
TL3
TL5
TL4
Q1
IRF9540
D2
1N5402
VT-3/150
LOW PASS
FILTER ASSEMBLY
VT-3/150 AMPLIFIER TH DESIGNATION (LOW POWER)
9326A5
MHW607
SELECT
2.2nF
C39
150nH FB3
47uF
C30 +
FB2
150nH
10R
L11
19nH
L8
L9
L10
19nH
R45 C35
SELECT
MRF262
TL1
VT-3/150 AMPLIFIER TH LAYOUT AND DESIGNATION (HIGH POWER)
9326A6
M3 x 6 CAP SOCK SCREW
4-2
4.1 VT-3/150 VHF Amplifier Component Layout
DE DANIELS
ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
VT3AMPM1
R6 POWER
27k4 2 - 8 Watts
392k 2 - 5 Watts
Power Range Selection
DE DANIELS
ELECTRONICS
VICTORIA B.C.
DE DANIELS
ELECTRONICS
4.2 VT-3/150 VHF Amplifier Schematic Diagram
TITLE: VT-3/150 VHF AMPLIFIER SCHEMATIC DIAGRAM
4-3
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
J2, JU5
DWG No: VT3AMPM2A DWG REV DATE: 10 DECEMBER 1995
DATE: 4 MARCH 1994
FORWARD
POWER
ALARM
C39
FORWARD
OUTPUT ALARM
ADJUST
VSWR
OUTPUT ALARM
ADJUST
OVERLOAD
ADJUST
OUTPUT
POWER
ADJUST
LB = LOW BAND
HB = HIGH BAND
U4
TL5, TP5
R45
Q7
L11
FB3, FIL5
D7
DWN BY: REX WONG
BOARD REV: 1.1BOARD No: 43-932611
APRVD:
-----
-----
-----
-----
-----
-----
-----
-----
-----
UNUSED REFERENCE DESIGNATORS
HIGHEST REFERENCE DESIGNATORS
VSWR
ALARM
+13.8 VDC
LOW / HIGH BAND
J1
SMB
RF IN (1 mW)
J2
TYPE N JACK
RF OUT
R9
10k0
C15
10nF
R7
50k
D1
MBZ5233B
R5
4k53
R10
10k0
C12
10nF
DS
D5P06V
Q2
TL5
R3
178R
R1
30R1
R4
49k9
D2
IN5402
LPF
FIL1
AMPLIFIER ENABLE I/P
LPF
FIL2
+9.5 VDC
LPF
FIL5*
+13.8 VDC
LPF
DS
Q1
IRF9540
R8
3k48
R6
SEL
D4
BYD17J
R2
178R
D3
BYD17J
L5
1.5uH R13
49k9
C16
150pF
R12
49k9
TL1
49R9
R15
R35
1k00
R34
49k9 C26
10nF
Q5
PZT2222A R44
10k0
R36
50k
C25
150pF
R33
49k9
R42
1k00
R43
27k4
C23
10nF
6
5
8
7
4
U2b
MC33172
L7
1.5uH
D7
MMBD701
R11
10k0
TL2
R16
49R9
R17
49R9
R22
49k9
R20
10k0
R21
50k
R19
49k9
C21
10nF
C20
150pF
R18
49k9
L6
1.5uH
D6
MMBD701
Q4
BC817-25
R29
10k0 R25
1k00
R28
27k4
Q6
BC817-25 R41
10k0 R39
1k00
R40
221k
R27
49k9
C17
10nF
R26
49k9
R30
49k9
Q3
PZT2222A
R31
10k0
R37
50k
R38
1k00
JU1
JU4
R24
1k00
2
3
1
U3a
2
3
1
U1a
2
3
1
U2a
6
5
8
7
4
U3b
MC33172
C18
100nF C19
10nF
C13
100nF
C14
10nF
6
5
4
7
8
U1b
MC33172
LPF
FIL3 JU2
LPF
FIL4 JU3
C24
100nF
TL3
C11
100nF
C9
18nF
L3
180nH
C5
18nF
+ C6
4.7uF
C4
18nF
L2
180nH
L1
180nH
L4
150nH
C2
18nF
C3
18nF
MHW 607 6
U4
MHW607
FB1
C1
1nF
Q7
MRF262
+13.8 VDC
L10
150nH
L9
150nH
51pF LB/24pF HB
C31
FB2
C35
SELECT
C38
56pF LB/220pF HB
FB3*
+
C30
47uF
C28
10nF
C27
100nF
L8
19nH
L11
19nH
C36
47pF LB/43pF HB
C37
47pF LB/36pF HB
C33
68pF LB/51pF HB
R45
10R
D5
MMBD701
R32
10k0
TP3
TP4
TP5
TP2
TP1
C8
1nF
C7
100nF
C10
10nF
R23
49k9
C22
10nF
R14
10k0
C34
20pF LB
C32
5.6pF LB
C29
1nF
SWITCHED +9.5V
SWITCHED +9.5V
TO ALL SWITCHED +9.5V
SWITCHED +9.5V
SWITCHED +9.5V
SWITCHED +9.5V C39
2.2 nF
JU5
2 4 5
1
3
OVERLOAD
DE DANIELS
ELECTRONICS
4-4 VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
This Page Intentionally Left Blank
DE
DANIELS
ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
4-5
5
4.3
VT-3/150 VHF Lowpass Filter Component Layout
4.4 VT-3/150 VHF Lowpass Filter Schematic Diagram
DE
DANIELS
ELECTRONICS
4-6
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
6
This Page Intentionally Left Blank
DE
DANIELS
ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
5-1
1
5 PARTS LISTS
5.1 VT-3/150
Amplifier Electrical Parts List
Ref
Desig Description Part No.
C1
CAP.,
SM,
1nF
CER,
1206, C0G 1008-
3B102K1G
C2-C5
CAP.,
SM,
18nF
CER,
1206, X7R 1008-4B183K5R
C6
CAP.,
SM,
4.7µF
TANT., 10%, 16V
1055-5B475K16
C7
CAP.,
SM,
100nF
CER,
1206, X7R 1008-5B104K5R
C8
CAP.,
SM,
1nF
CER,
1206, C0G
1008-3B102K1G
C9
CAP.,
SM,
18nF
CER,
1206, X7R 1008-4B183K5R
C10
CAP.,
SM,
10nF
CER,
1206, X7R 1008-4B103K5R
C11
CAP.,
SM,
100nF
CER,
1206, X7R 1008-5B104K5R
C12
CAP.,
SM,
10nF
CER,
1206, X7R 1008-4B103K5R
C13
CAP.,
SM,
100nF
CER,
1206, X7R 1008-5B104K5R
C14,
C15
CAP.,
SM,
10nF
CER,
1206, X7R 1008-4B103K5R
C16
CAP.,
SM,
150pF
CER,
1206, C0G
1008-2B151J1G
C17
CAP.,
SM,
10nF
CER,
1206, X7R 1008-4B103K5R
C18
CAP.,
SM,
100nF
CER,
1206, X7R 1008-5B104K5R
C19
CAP.,
SM,
10nF
CER,
1206, X7R 1008-4B103K5R
C20
CAP.,
SM,
150pF
CER,
1206, C0G
1008-2B151J1G
C21-C23
CAP.,
SM,
10nF
CER,
1206, X7R 1008-4B103K5R
C24
CAP.,
SM,
100nF
CER,
1206, X7R 1008-5B104K5R
C25
CAP.,
SM,
150pF
CER,
1206, C0G
1008-2B151J1G
C26
CAP.,
SM,
10nF
CER,
1206, X7R 1008-4B103K5R
C27
CAP.,
SM,
100nF
CER,
1206, X7R 1008-5B104K5R
C28
CAP.,
SM,
10nF
CER,
1206, X7R 1008-4B103K5R
C29
CAP.,
SM,
1nF
CER,
1206, C0G
1008-3B102K1G
C30
CAP.,
47µF
DIP. TANT., 20%, 35V 1054-6M476M35
C31
CAP.,SM,
51pF
PORCEL.,
5% 500V 1036-1B2510J5 (132 - 150 MHz)
C31
CAP.,SM,
24pF
PORCEL.,
5% 500V 1036-1B2240J5 (150 - 174 MHz)
C32
CAP.,SM,
5.6pF
PORCEL.,
±0.25pF
500V 1036-0B2569C5 (132 - 150 MHz)
C32
CAP.,SM,
NOT INSTALLED NOT INSTALLED (150 - 174 MHz)
C33
CAP.,SM,
68pF
PORCEL.,
5% 500V 1036-1B2680J5 (132 - 150 MHz)
C33
CAP.,SM,
51pF
PORCEL.,
5% 500V 1036-1B2510J5 (150 - 174 MHz)
C34
CAP.,SM,
20pF
PORCEL.,
5% 500V 1036-1B2200J5 (132 - 150 MHz)
C34
CAP.,SM,
NOT INSTALLED NOT INSTALLED (150 - 174 MHz)
C35
CAP.,
330pF METAL CLAD,1% 250V 1046-2A331FDB (132 - 150 MHz)
C35
CAP.,
270pF METAL CLAD, 1% 250V 1046-2A27TFDB (150 - 174 MHz)
C36
CAP.,SM,
47pF
PORCEL.,
5% 500V 1036-1B2470J5 (132 - 150 MHz)
C36
CAP.,SM,
43pF
PORCEL.,
5% 500V 1036-1B2430J5 (150 - 174 MHz)
C37
CAP.,SM,
47pF
PORCEL.,
5% 500V 1036-1B2470J5 (132 - 150 MHz)
C37
CAP.,SM,
36pF
PORCEL.,
5% 500V 1036-1B2360J5 (150 - 174 MHz)
C38
CAP.,SM,
56pF
PORCEL.,
5% 500V 1036-1B2560J5 (132 - 150 MHz)
C38
CAP.,SM,
220pF
PORCEL.,
5% 200V 1036-2B2221J2 (150 - 174 MHz)
C39
CAP.,
2.2nF
FILM,
MMK5,10%,63V 1016-3A222K63
D1 DIODE, MBZ5233B 6.0V ZENER, SOT-23
2102-MBZ5233B
D2 DIODE, IN5402 3A
RECT,
DO-201AD
2001-1N540200
D3, D4 DIODE, BYD17J
RECTIFIER,
SOD-87
2101-BYD17J00
D5 DIODE, MMBD701 HOT
CARRIER,
SOT-23 2105-MMBD7010
D6, D7 DIODE, MMBD701 HOT
CARRIER,
SOT-23 2105-MMBD7010
DE
DANIELS
ELECTRONICS
5-2
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
2
Ref
Desig Description Part No.
FB1 FERRITE BEAD,
SM,
43 MIX 1812 PKG 1213-43181200
FB2, FB3 FERRITE BEAD, 64MIX
3X3.5mm
OD 1210-64030350
FIL1-FIL5
FILTER,
EMI
PI/5500pF,
8-32 UNC 1302-P552D10D
J1 CONNECTOR, SMB, JACK,2 HOLE FLANGE 5120-J2SC01BG
J2 CONNECTOR, N JACK PANEL MNT, C/SNK 5184-10923011
L1-L3 INDUCTOR,
SM.,
180nH 20%, 1812 1255-2GR1800M
L4 CHOKE,
RF/MOULD.,
150nH 10%, .37 1251-2B00R15K
L5 INDUCTOR,
SM,
1.5µH
10%, 1812 1255-3G1R500K
L6, L7 INDUCTOR,
SM,
1.5µH
10%, 1812 1255-3G1R500K
L8 COIL, 1.5
TURNS,
18AWG, 3.83mmID 1220-1T501812
L9 CHOKE,
RF/MOULD.,
150nH 10%, .25 1251-2A00R15K
L10 CHOKE,
RF/MOULD.,
150nH 10%, .37 1251-2B00R15K
L11 COIL, 1.5
TURNS,
18AWG, 3.83mmID 1220-1T501812
LPF1
LPF,
ASSEMBLY VT-3/150 AMPLIFIER A21-LPF3/150
PCB
PCB,
VT-3/150 TX AMPLIFIER 4321-15932611
Q1
MOSFET,
IRF9540 P-CHANNEL, TO-220 2044-IRF95400
Q2
MOSFET,
D5P06V
P-CHAN.,
DPAK 2144-D5P06V00
Q3
TRANSISTOR,
PZT2222A NPN, SOT-223 2120-PZT2222A
Q4
TRANSISTOR,
BC817-25 NPN, SOT-23 2120-BC817025
Q5
TRANSISTOR,
PZT2222A NPN, SOT-223 2120-PZT2222A
Q6
TRANSISTOR,
BC817-25 NPN, SOT-23 2120-BC817025
Q7 TRANSI
STOR,
MRF262
VHF, TO-220 2025-MRF26200
R1
RES.,
SM,
30R1 1206, 1%,100ppm 1150-1B30R1FP
R2,
R3
RES.,
SM,
178R 1206, 1%,100ppm 1150-2B1780FP
R4
RES.,
SM,
49k9 1206, 1%, 100ppm 1150-4B4992FP
R5
RES.,
SM,
4k53 1206, 1%, 100ppm 1150-3B4531FP
R6
RES.,
SM,
27k4 1206, 1%, 100ppm 1150-4B2742FP
(Default)
R6
RES.,
SM,
392k 1206, 1%, 100ppm 1150-4B3922FP (Exciter for VT-30)
R7
POT.,
SM,
50k 12 TURN, SIDE ADJUST 1172-M30503X5
R8
RES.,
SM,
3k48 1206, 1%, 100ppm 1150-3B3481FP
R9-R11
RES.,
SM,
10k0 1206, 1%, 100ppm 1150-4B1002FP
R12,
R13
RES.,
SM,
49k9 1206, 1%, 100ppm 1150-4B4992FP
R14
RES.,
SM,
10k0 1206, 1%, 100ppm 1150-4B1002FP
R15-R17
RES.,
SM,
49R9 1206, 1%, 100ppm 1150-1B49R9FP
R18,
R19
RES.,
SM,
49k9 1206, 1%, 100ppm 1150-4B4992FP
R20
RES.,
SM,
10k0 1206, 1%, 100ppm 1150-4B1002FP
R21
POT.,
SM,
50k 12 TURN, SIDE ADJUST 1172-M30503X5
R22,
R23
RES.,
SM,
49k9 1206, 1%, 100ppm 1150-4B4992FP
R24,
R25
RES.,
SM,
1k00 1206, 1%, 100ppm 1150-3B1001FP
R26,
R27
RES.,
SM,
49k9 1206, 1%, 100ppm 1150-4B4992FP
R28
RES.,
SM,
27k4 1206, 1%, 100ppm 1150-4B2742FP
R29
RES.,
SM,
10k0 1206, 1%, 100ppm 1150-4B1002FP
R30
RES.,
SM,
49k9 1206, 1%, 100ppm 1150-4B4992FP
R31,
R32
RES.,
SM,
10k0 1206, 1%, 100ppm 1150-4B1002FP
R33,
R34
RES.,
SM,
49k9 1206, 1%, 100ppm 1150-4B4992FP
R35
RES.,
SM,
1k00 1206, 1%, 100ppm 1150-3B1001FP
R36,
R37
POT.,
SM,
50k 12 TURN, SIDE ADJUST 1172-M30503X5
DE
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ELECTRONICS
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
5-3
3
Ref
Desig Description Part No.
R38,
R39
RES.,
SM,
1k00 1206, 1%, 100ppm 1150-3B1001FP
R40
RES.,
SM,
221k 1206, 1%, 100ppm 1150-5B2213FP
R41
RES.,
SM,
10k0 1206, 1%, 100ppm 1150-4B1002FP
R42
RES.,
SM,
1k00 1206, 1%, 100ppm 1150-3B1001FP
R43
RES.,
SM,
27k4 1206, 1%, 100ppm 1150-4B2742FP
R44
RES.,
SM,
10k0 1206, 1%, 100ppm 1150-4B1002FP
R45
RES.,
10R METAL
FILM,
5%, 0.5W 1101-1A0100JP
TL1 COAX, DIRECTIONAL COUPLER 0.5" 7496-30CR005T
TL2, TL3 COAX, DIRECTIONAL COUPLER 0.5" 7496-30CR005T
TL5 COAX, CONFORMABLE
31.5mm,
50 OHM, 0.083 7482-5024T083
U1-U3
I.C.,
MC33172 DUAL OP
AMP,
S0-8 2302-33172N08
U4
AMP,
RF,MHW607-1,7W,136-154MHz 2256-MHW60701 (132 - 150 MHz)
U4
AMP,
RF,MH
W607-2,7W,146-174MHz
2256-MHW60702 (150 - 174 MHz)
5.2 VT-3/150 Low Pass Filter Electrical Parts List
Ref
Desig Description Part No.
C1
CAP.,
SM,
30pF
PORCEL.,
5%, 500V 1036-1B2300J5
C2-C4
CAP.,
SM,
47pF
PORCEL.,
5%, 500V 1036-1B2470J5
C5
CAP.,
SM,
30pF
PORCEL.,
5%, 500V 1036-1B2300J5
L1 COIL, 55nH 3.0
TURNS,
18AWG,
6.70mm
ID 1220-3T001822
L2, L3 COIL, 60nH 3.0
TURNS,
18AWG,
6.70mm
ID 1220-3T001822
L4 COIL, 55nH 3.0
TURNS,
18AWG,
6.70mm
ID 1220-3T001822
PCB
PCB,
LPF
VT-3/150, UT-3/400 AMP 4321-16931712
5.3 VT-3/150
Amplifier Mechanical Parts List
Description Part No. Qty.
CASE,
MT-3 VHF/UHF
AMPLIFIER,
ALUMINUM
3702-66102130 1
HEATSHRINK, 1/8" DIA, RED, 1" LENGTH CONSUMABLE 1
INSULATOR, THERM. COND. TO-220 5622-1T220701 1
LABEL,
MTL/PE,
VT-3/150 AMP ID 3508-21002010 1
LID, CASE MT-3
AMPLIFIER,
ALUMINUM
3702-66102151 1
SCREW,
M2 X 6, PAN/PHILLIPS,A2
5812-2M0PP06S
2
SCREW,
M2 X 4,
PAN/PHIL.,
S/S
5812-2M0PP04S
10
SCREW,
M2.5
X 6,
PAN/PHIL.,
S/S
5812-2M5PP06S
3
SCREW,
M3 X 6,
FLAT/PHIL.,
S/S
5812
-3M0FP06S
4
SCREW,
M3 X 8,
PAN/PHIL.,
S/S
5812-3M0PP08S
9
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VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
4
Description Part No. Qty.
SCREW,
M3 X 8,
CAP
SOCK-M2.5,
S/S
5812-3M0SA08S 3
SCREW,
M3 X 8,
CAP
SOCK-M2.5,
S/S
5812-3M0SA08S 2
SET
SCREW,
M3 X 3, HEX
SOCKET,
A2 5817-3M0AC03S 1
SHOULDER WASHER, M3 0.24" OD, NYLON 5674-120N2440 1
TUBING,
TFE-260C,
22AWG,Thin 5mm 7610-260C22TW 1
TURRET TERMINAL, 4-40
0.188L,
Tn 5053-144M188T 1
WIRE, PVC/STRANDED 16AWG, RED, 70 mm 7110-16S26302 1
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VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
6-1
6
REVISION HISTORY
ISSUE
DATE
REVISION
1 Jul 97 First
Issue.
DE
DANIELS
ELECTRONICS
6-2
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
ISSUE
DATE
REVISION