Codan Radio Communications UT 4 400 User Manual
MT-3
INSTRUCTION MANUAL
/MT-4
RADIO
UHF AMPLIFIER
UT-3 / UT-4
406 - 470 MHz
SYSTEMS
Copyright © 1998
reproduced, stored in a
mechanical,
Electronics
DE™
Trademark
Issue:
Issue
Printing
Part No.:
Ltd.
is a
registered
Office.
Peliminary
Date:
Date:
Daniels
photocopying, recording or otherwise, without the prior written consent of
trademark
October
October
IM23D-UT
Covers models:
Electronics
retrieval
98 Previous Issue
98
34400AMP
system or
of
Daniels
Previous Issue: N/A
UT-3/400 Amplifier
UT-4/400 Amplifier
Ltd.
All
rights reserved. No part of this
transmitted
Electronic
Ltd.
Date:
publication
in any form or by any means,
registered
N/A
in the United States Patent and
Daniels
Victoria,
PRINTED IN
Electronics
B.C.
may be
electronic,
Daniels
Ltd.
CANADA
DE
DANIELS
ELECTRONICS
Reviewed By:
The
user's
authority
to
operate
this
equipment
could be revoked through any
The design of this
equipment
is subject to change due to continuous
development. This
equipment
may
incorporate
minor changes in
detail
from the
Quality
Larry
Assurance:
Freeman
_________________
Name Signature
NOTE:
changes or
information
modifications
contained
in this manual.
not expressly approved by
Daniels
Date
Electronics
Ltd.
ii
UHF Amplifier Instr
uction Manual UT-3 406 - 512 MHz
DE
DANIELS
ELECTRONICS
TABLE OF CONTENTS
Page
1 GENERAL....................................................................................... 1-1
1.1
1.2 Perf
Introduction
ormance
............................................................................. 1-1
Specification
............................................................ 1-1
2
3
THEORY OF OPERATION
2.1
2.2 Power
2.3 RF
2.3.1
Amplifier
Requirements
Circuitry
UT-3/400 Lowpass
Operation
............................................................................ 2-2
2.4 Power Control
2.5 Power Sensing
2.5.1
2.5.2
2.5.3
Output
VSWR Sense .................................................................. 2-4
VSWR
................................................................... 2-1
.................................................................... 2-1
................................................................... 2-2
Filter
Circuitry
Circuitry
............................................................... 2-3
.............................................................. 2-3
Power Sense .......................................................... 2-3
Overload
.............................................................. 2-4
UT-3/400 AMPLIFIER ALIGNMENT
.................................................... 2-2
...................................................... 3-1
3.1 General.................................................................................. 3-1
3.2 Repair Note............................................................................. 3-1
3.3
3.4 Printed
Recommended
Circuitboard
Test
Equipment
Numbering
List ................................................. 3-1
Convention
....................................... 3-2
3.5 Standard Factory Settings and Jumper Configuration............................. 3-2
3.6 UT-3/400
3.6.1
3.6.2
3.6.2.1
3.6.2.2
3.6.2.3
3.6.2.4
3.6.2.5
3.6.2.6
Amplifier
Alignment
....................................................... 3-2
General......................................................................... 3-2
UT-3/400
Amplifier
Adjustment
............................................ 3-3
General Set-Up....................................................... 3-3
Output
Output
Antenna
Antenna
Procedure
Power
Alarm
(Forward Power) ........................... 3-4
Power......................................................... 3-5
VSWR
VSWR
Alarm
Overload
Verification
(Reverse Power).......................... 3-5
........................................... 3-6
............................................... 3-6
4
ILLUSTRATIONS AND SCHEMATIC DIAGRAMS
4.1 UT-3/400 UHF
4.2 UT-3/400 UHF
4.3 UT-3/400 UHF Lowpass
4.4 UT-3/400 UHF Lowpass
Amplifier
Amplifier
Component
Schematic
Filter
Component
Filter
Schematic
Layout..................................... 4-2
Diagram
Layout............................... 4-5
Diagram
.................................... 4-1
..................................... 4-3
UHF Amplifier Instruction Manual UT-3/UT-4 406 - 512 MHz
............................... 4-5
iii
DE
DANIELS
ELECTRONICS
5 PARTS LISTS...................................................................................5-1
5.1 UT-4/400 UHF
5.2 UT-4/400 UHF
5.3 UT-3/400 UHF Low Pass
Amplifier
Amplifier
Electrical
Parts List......................................5-1
Mechanical
Filter
Electrical
Parts List...................................5-4
Parts List..............................5-4
6
REVISION HISTORY
..........................................................................6-1
iv
UHF Amplifier Instr
uction Manual UT-3 406 - 512 MHz
DE
DANIELS
ELECTRONICS
1
GENERAL
1.1 Introduction
The UT-3/400
UHF
Transmitter
Amplifier
provides the final stage of RF
UT-3 406 -512 MHz family. The
amplification
amplifier
has four
and
filtering
distinct
for the
frequency ranges:
406 to 430 MHz, 450 to 470 MHz, 470 to 490 MHz and 490 to 512 MHz as well as two
output power ranges: 0.5 to 2.0 Watts and 2.0 to 8.0 Watts. The UT-3/400
a
machined
aluminum
case that ensures
optimum
RF shielding, provides a good
Amplifier
ground,
is housed in
acts as a heatsink.
Additionally,
which can be
sensor protects the
RF gain when a VSWR overload
Output
filtering
The lowpass
provided
Refer to Section 4 for the UT-3 406 - 512 MHz UHF
layouts and
the UT-3/400
individually
for the UT-3/400
filter
assembly is mounted in a
maximum
schematic
Amplifier
configured as open
amplifier
from high
attenuation
diagrams
condition
Amplifier
of
harmonic
is equipped with output power and VSWR sensing lines
antenna
collector
VSWR by
or
linear
outputs. The
approximately
internal
halving the amplifier's
is present.
is provided by the UT-3/400 Lowpass
separate
compartment
of the
amplifier
Filter
case in order to
and other spurious signals.
amplifier
and lowpass
filter
component
entire
distinct
and also
VSWR
Board.
1.2
Type: MT-3 series UHF
Compatibility:
Performance Specification
Amplifier
MT-3 series
module.
Transmitter
Main
Board.
Frequency Range: 406 to 430 MHz, 450 to 470 MHz, 470 to 490 MHz or
490 to 512 MHz.
RF Power
RF power Input:
Output:
adjustable
nominal
level
0.5 to 2.0 Watts or 2.0 to 8.0 Watts
adjustable
from +4 dBm to +10 dBm,
held within +/- 2 dB of nominal.
Ouput
Input
Duty
Impedance
/Output
Isolation:
Cycle:
and
VSWR:
50 Ω, Type N
> 60 dB
100%: Continuous
connector;
3:1 max. VSWR.
operation
from -40˚ C to
+60˚C.
UHF Amplifier Instruction Manual UT-3 406 - 512 MHz
1-1
DE
DANIELS
ELECTRONICS
Harmonic Emissions: Less than -80 dBc .
Transmitter
Transmitter
Operating
Operating
Operating
Transmit
Amplifier
Amplifier
Amplifier
Temperature
Humidity:
Voltage:
Current: 0.7 Amp
Standby Current: less than 0.5 mA.
Enable:
Enable
Mismatch
Alarm:
Response:
Protection:
20:1 VSWR at all phase angles.
Forward power sense and reverse
- open
-
linear
collector
output
(separate
Range: -30˚ C to +60˚ C,
95% RH (non-condensing) at +25˚ C.
+13.8
+9.5
Vdc Nominal (range +11 to +16 Vdc),
Vdc Regulated.
typical
Active
typically
within 5 msec;
to
ground.
overdamped, rising to within 90% of full power
maximum
output
(separate
lines only).
optional
; 1.1 Amp
-40˚ C
maximum
(underdamped)
VSWR;
or 'OR'ed
temperature
overshoot of
configuration);
test.
30%.
1-2
UHF Amplifier Instruction Manual UT-3 406 - 512 MHz
DE
DANIELS
ELECTRONICS
2
THEORY OF OPERATION
2.1
The
power
transistor Q1 to boost the output power; consequently, it does not require the
In both versions the power control
keeps the power constant. Therefore, the output power from the high power
as the
amplifier
Power for the UT-3/400
supply (if required) is
always switched by the transmitter's PTT circuitry. The UT-3/400
power from the
Amplifier Operation
operation
(0.5-2.0
unregulated
of the UT-3/400
W) or a high power
+13.8
operates;
it only changes a few
+13.8
Amplifier
varies
(2.0-8.0
slightly
according
to whether the
W) version. The low power
amplifier
amplifier
+13.8
circuitry
monitors the RF output power of
amplifier
amplifier
Vdc supply varies. Note that the frequency band does not change how the
Amplifier
is provided from the MT-3
continuously
Vdc supply
component
connected
until
+9.5
values in the RF circuitry.
to the
Transmitter
amplifier;
whereas, the
Amplifier
Board. The
+9.5
will not consume any
Vdc is switched on for the amplifier's
Vdc supply is
an RF input signal is present. The synthesizer or crystal control module controls the
the amplifier's
synthesizer will ground the input
locked. This prevents unwanted spurious emissions during
sequence is
circuitry;
listed
below:
switching it on by grounding the amplifier's input
enable
line only when the
transmitter
synthesizer's
start-up. A
enable
RF signal is phase
typical
is a low
does not use
Vdc supply.
U4 and
will change
+13.8
circuitry
+9.5
Vdc
and
Vdc to
line. The
start-up
1)
2) the
3)
+13.8
+9.5
Vdc is always present
transmitter
is keyed on
Vdc is switched on by the PTT
or crystal control module PTT line is pulled low
4) an RF signal is output to the
5) the amplifier's input
6) the
amplifier
outputs RF power
enable
amplifier
line is
circuitry
activated
and the synthesizer
UHF Amplifier Instruction Manual UT-3 406 - 512 MHz
2-1
DE
DANIELS
ELECTRONICS
2.2
Supply Current
Supply Current
Power Requirements
Typical
Table
and the current drawn from the
Table 2-1
current
requirements
for the UT-3/400
2-1 below. The current drawn from the
+13.8
UT-
3/400 Amplifier Current Consumption
Vdc supply should never
0.5 to 2.0 Watt Amplifier
Output
+9.5
Vdc
Amplifier
+9.5
2.0
to
Output
at
different
power levels are given in the
Vdc supply should never
8.0
exceed
Watt
+9.5
1.5 Amps.
Amplifier
Vdc
+13.8
exceed
Vdc
1.2 Amps
Power Supply Current Power
0.5 W 0.65 A 2.0 W 0.64 A 0.51 A
1.0 W 0.87 A 4.0 W 0.79 A 0.75 A
1.5 W 1.02 A 6.0 W 0.89 A 0.93 A
2.0 W 1.17 A 8.0 W 1.04 A 1.10 A
Note:
Current consumption measured at 470 MHz
2.3 RF Circuitry
The RF
module
TL4), and the UT-3/400 Lowpass Filter. The heart of the UT-3/400
module
connector, for a low power unit. In high power units, the output of U4 is further
to a
transistor
tunable, the networks have been made broadband so that the high power
circuitry
(U4),
U4.
This module
maximum
Q1's
consists of several blocks: a 5 dB input pad (R1, R2, and R3), an RF
an output power boosting transistor (Q1), three
directional
couplers (TL1, TL3, and
Amplifier
amplifies
of 8.0 Watts at the
input and output match.
a 1 mW signal up to a
antenna
connector.
Although
the input
maximum
Capacitors
match
of 2.0 W, at the
C17 and C24 provide tuning for
and the output
amplifiers
is RF
amplified
match
for Q1 are
will
amplifier
amplifier
antenna
by Q1
operate
over the same frequency range as the low power amplifiers. The frequency band of the UT-3/400
Amplifier
Directional
sampled power is used by the sensing and power control
operation. The final step in the RF path is output
is
determined
by the
operating
frequency range of the RF
amplifier
couplers (TL1, TL3, and TL4) are used to sample forward and reverse
filtering
and, as
circuits
mentioned
to control the amplifier's
earlier, this is done by
module
power.
U4.
The
the UT-3/400 Lowpass Filter.
2.3.1
The UT-3/400 Lowpass
approximately
UT-3/400 Lowpass Filter
Filter
is a 50 ohm, 9 pole,
512 MHz. The lowpass
filter
reciprocal
assembly
well as any other out-of-band emissions so that a
connector.
2-2
UHF Amplifier Instruction Manual UT-3 406 - 512 MHz
filter
attenuates
'clean'
with a 3 dB cutoff frequency of
the desired
signal's
harmonics as
RF signal is output to the
antenna
DE
DANIELS
ELECTRONICS
2.4
Power Control Circuitry
The UT-3/400
RF power to control the gain of RF
to the output power
U4's
gain control pin. The output power
potentiometer.
In low power
C27, R18, L11, R19, and C28. In high power
Amplifier
setpoint
amplifiers
employs a closed loop power control which uses a sample of the forward
amplifier
and
generates
jumper JU5 is
U4.
Op-amp U1b compares the sampled RF
an error signal which Q3 uses to control the
setpoint
installed
is
determined
by R7, the
Output
and the forward power is sampled by TL3, D6,
amplifiers
jumper JU5 is not
installed
voltage
Power
voltage
on
Adjust
and the
forward power is sampled by TL1, D5, C14, R13, L6, R12, and C15. In both high power and
low power amplifiers, the power control
Therefore, in high power amplifiers, the amplifier's output power will
the
+13.8
2.5
The UT-3/400
individually
output is
antenna
proportional
Vdc supply voltage.
Power Sensing Circuitry
Amplifier
is equipped with output power and VSWR sensing lines which can be
configured as open
active
low, that is, when a fail
VSWR) the open
collector
to the sensed output power or
collector
transistor is turned on. In
circuitry
or
linear
condition
antenna
keeps the output power of U4 constant.
outputs. In open
fluctuate
collector
with
variations
in
configuration, the
is detected (not enough output power or too high
linear
configuration, a
voltage
VSWR is output.
Both the
however, the
Output
Output
Power
Power
Alarm
setpoint. This is because the
Alarm
2.5.1 Output
The output power sense
power.
op-amp
potentiometer.
not
for open
In open
alarm
the
circuitry.
Power Sense
The sampled power is
U3b.
Op-amp
The
amplified
installed)
condition
setting
or
compared
collector
collector
occurs. The
of R21 (the
operatio
configuration, Q6 (the open
circuitry
U3b's
to
n (JU1 not installed, JU2 installed).
Output
setpoint
Alarm
Output
setpoint
Power
uses
rectified
amplification
voltage
+6.3
is then output
Vdc by op-amp U1a which then drives transistors Q5 and Q6
adjustment
Power
Alarm
and the VSWR
Alarm
setpoint
are
individually
must always be adjusted before the VSWR
Alarm
directional
by diode D6 and
is
range for the output power
Adjust
setpoint
is used as a
reference
coupler TL3 to sample some of the forward
controlled
directly
collector
capacitor
by R21, the output power
in
linear
output transistor) is turned on when an
C27 and then
operation
alarm
can vary depending on
potentiometer).
adjustable;
Alarm
by the VSWR
amplified
alarm
by
adjust
(JU1 installed, JU2
UHF Amplifier Instruction Manual UT-3 406 - 512 MHz
2-3
Loading...