Codan Radio Communications AMP-3A130 AMP-3A130-25 User Manual IM71 AMP3A1302

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DANIELS
TM
ELECTRONICS LTD.
MT-3 RADIO SYSTEMS
25W AM POWER AMP
INSTRUCTION MANUAL
AMP-3
118 - 138 MHz
Covers Model: AMP-3A130-25-00
Copyright © 2002 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.
DE™ is a registered trademark of Daniels Electronics Ltd. registered in the United States Patent and Trademark Office.
Printing Date:
Issue Date:
Issue:
Document No.:
Nov 2002
Nov 2002
Previous Issue Date: N/A
Previous Issue:
N/A
IM71-AMP3A130-25
Daniels Electronics Ltd.
Victoria, BC
PRINTED IN CANADA
NOTE:
The user's authority to operate 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.
DANIELS
TM
ELECTRONICS LTD.
ii
25W AM Power Amplifier Instruction Manual
IM71-AMP3A130-25
RF Exposure Warning
This transmitting equipment conforms to SAR (Specific Absorption Rate) limits regarding exposure of human
beings to radio frequency electromagnetic energy, as defined in the following national and international standards
and guidelines:
1.
Industry Canada Radio Standards Specification 102 (RSS-102), Evaluation Procedure for Mobile and
Portable Radio Transmitters with respect to Health Canada’s Safety Code 6 for Exposure of Humans to
Radio Frequency Fields;
2.
Health Canada Safety Code 6, Limits of Human Exposure to Radiofrequency Electromagnetic Fields in
the Frequency Range from 3 kHz to 300 GHz 1 ;
3.
United States Federal Communications Commission, Code of Federal Regulations; 47 CFR Part 1,
§ 1.1310 Radiofrequency radiation exposure limits; and
4.
American National Standards Institute (ANSI) criteria for localized SAR in Section 4.2 of “IEEE
Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields,
3 kHz to 300 GHz” 2 .
Notes:
A.
The SAR limit for uncontrolled exposure of persons not classed as RF and microwave exposed workers
(including the general public) for transmitter equipment operating below 10 GHz, as defined in the
references above, is 2 W/m2 (0.2 mW/cm2 ).
B.
This transmitting equipment is designed for use with an outdoor antenna with a characteristic antenna
gain of 10 dBi, typically mounted at a significant height above ground to provide for adequate signal
coverage. To ensure that the general public is not exposed to a power density above the recommended
limit of 2 W/m2 (0.2 mW/cm2 ), the equipment must be installed such that the following minimum safe
distances from the antenna are maintained:
C.
6.0 m (19.7 ft)
when configured with
25 W AM PA (at 90% modulation)
2.4 m (7.9 ft)
standalone (i.e. no PA)
4 W AM TX (at 90% modulation)
The following power density formula has been utilized in determining minimum safe distances:
PG
S=
4πR
where:
S = Power density (in appropriate units, e.g. W/ m2 )
P = Power input to the Antenna (in appropriate units, e.g., W)
G = Power gain of the antenna in the direction of interest relative to an isotropic radiator
R = Distance to the center of radiation of the antenna (appropriate units, e.g., m)
Minister of Public Works and Government Services, Canada 1999, Cat. H46- 2/ 99- 237E, ISBN 0- 662- 28032- 6
ANSI/IEEE C95.1–1992, Copyright 1992 by the Institute of Electrical and Electronics Engineers, Inc., New York, New York 10017
RF Exposure Warning
TABLE OF CONTENTS
Page
GENERAL................................................................................................................1-1
1.1 Introduction....................................................................................................1-1
1.2 Performance Specifications.............................................................................1-1
1.3 Physical Specifications...................................................................................1-2
THEORY OF OPERATION.....................................................................................2-1
2.1 General............................................................................................................2-1
2.2 Control Board Circuitry .................................................................................2-1
2.3 RF Amplifier Circuitry...................................................................................2-2
2.4 Printed Circuit board Numbering Convention................................................2-3
INSTALLATION AND SITE OPERATION...........................................................3-1
AMPLIFIER ALIGNMENT.....................................................................................4-1
4.1 Recommended Test Equipment List ..............................................................4-1
4.2 RF Amplifier Board Alignment......................................................................4-3
4.3 Control Board Alignment ...............................................................................4-5
ILLUSTRATIONS AND SCHEMATIC DIAGRAMS ...........................................5-1
5.1 Rack Mounting Positions...............................................................................5-1
5.2 RF Power Amplifier Block Diagram ..............................................................5-2
5.3 RF Power Amplifier Exploded View..............................................................5-3
5.4 RF Power Amplifier Board - Component Layout ........................................5-4
5.5 RF Power Amplifier Board - Schematic........................................................5-5
5.6 Control Board - Component Layout..............................................................5-6
5.7 Control Board - Schematic..............................................................................5-7
PARTS LISTS ..........................................................................................................6-1
6.1 RF Power Amplifier Board Electrical Parts List............................................6-1
6.2 RF Power Amplifier Board Mechanical Parts List ........................................6-3
6.3 Control Board Electrical Parts List.................................................................6-4
6.4 Control Board Mechanical Parts List.............................................................6-7
REVISION HISTORY..............................................................................................7-1
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1
GENERAL
1.1 Introduction
The AMP-3A130-25 provides the final stage of RF amplification and filtering for the AM amplifier
AMP-3A130-25, 118 - 138 MHz family. The amplifier covers 118 - 138 MHz with continuously
adjustable 10.0 to 25.0 W of output power.
The amplifier is packaged in the compact Eurostandard (5"h x 2.8"w x 7.5"d) housing, and is
robustly designed for mountain top or transportable applications. The amplifier modules use high
reliability components and each is accompanied with a complete operational test report on delivery.
1.2 Performance Specifications
Frequency:
118 to 138 MHz
Output Power:
10-25 Watts Continuous (set by VT-3A exciter)
Output Impedance:
50 Ω
Spurious & Harmonics:
≤ -80 dBc
Distortion
≤ 5% at 30% modulation
≤ 10% at 90% modulation @ 25ºC
Operating Voltage:
+24 to 32 Vdc (28.0 Vdc Nominal)
Transmit Current:
≤ 3.0 A @ 25W
Standby Current:
Mode 1 & 2: ≤ 2 mA (PTT or RF signal switched)
Mode 3:
≤ 200 mA (Continuous)
Load Mismatch Protection:
20:1 VSWR at all phase angles
Thermal Protection:
Thermal interlock disables at 80oC (175oF)
Duty Cycle:
Operating Temperature:
100%
-30oC to +60oC (-40oC to +60oC Optional)
Operating Humidity:
Up to 95% R.H. @ 25oC
Front Panel Indicators:
RF Power
High VSWR
Overload
Over Temperature
Exciter
Industry Canada Approval:
VT-3A130, 2.5W output for 25W
TBA
FCC Approval:
TBA
DANIELS
TM
ELECTRONICS LTD.
25W AM Power Amplifier Instruction Manual
IM71-AMP3A130-25
1-1
1.3 Physical Specifications
RF Connectors:
Type N Standard
Corrosion Prevention:
Anodized aluminum construction.
Stainless steel hardware.
Physical Dimensions:
Width:
Height:
14.2 cm (5.6") 13.1 cm (5.16")
Weight:
2.4 kg (5.5 lb)
Features:
• Heavy Duty Aluminum Heatsink
Depth:
19 cm (7.5")
• Thermal switched Fan (at +40˚C)
• Outputs of operating status signals:
-RF Power
- High VSWR
DANIELS
TM
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2
THEORY OF OPERATION
DANIELS
TM
ELECTRONICS LTD.
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2-1
2.3 RF Amplifier Circuitry
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2.4 Printed Circuit board Numbering Convention
To ease troubleshooting and maintenance procedures, Daniels Electronics Limited has adopted a
printed circuit board (PCB) numbering convention in which the last two digits of the circuit board
number represent the circuit board version. For example:
• PCB number 43-912010 indicates circuit board version 1.0;
• PCB number 50002-02 indicates circuit board version 2 (no decimal versions)
All PCB's manufactured by Daniels Electronics are identified by one of the above conventions.
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3
INSTALLATION AND SITE OPERATION
The AMP-3 RF power amplifier is approved for operation with the VT-3A130 exciter. A complete
M3 subrack shipped directly from the factory is normally set to the appropriate options and output
power calibration as requested by the customer. These units require no tuning.
For AMP-3 amplifiers shipped separately from the MT-3 racks, install as outlined:
1. Connect the output of the exciter to the input of the AMP-3 Amplifier with the cable
provided.
2. Connect the PTT control signal from subrack to the PTT input of the power amplifier if the
PTT activation mode is selected.
3. Connect the antenna system, key the transmitter and check the LED status indicators.
The LED indicators will only illuminate when the power amplifier is keyed and are defined as
follows:
A. RF Power - indicates that a preset RF power level is present at the power amplifier
output. The threshold level is internally adjustable for various RF output levels
over the 10-25 watt range (factory set at 10 W.)
B. High VSWR – Alarm indicating that the load impedance mismatch is high. The
threshold level is internally adjustable from 2:1 to infinite:1 (factory set at 3:1.)
C. Overload – (VSWR Overload Alarm) indicates that the RF load impedance
mismatch is extremely high. Under this condition, the DC supply voltage
(nominally +28.0 Vdc) to the PA is interrupted and the status is locked until the RF
signal from the exciter is removed. The factory threshold level is set when the load
terminal is open.
D. Over Temp - (Over Temperature Alarm) a thermostat control switch interrupts the
DC supply voltage to the PA when the RF transistor body temperature exceeds
175 ˚F (80 ˚C). Utilizing circuit hysterisis, the thermostat will reset at 167 ˚F
(75 ˚C).
The fan is activated automatically when the RF transistor body temperature reaches approximately
+40oC. The fan's operating temperature range is -20oC to +60oC. It will not operate when the
ambient temperature is below -20oC.
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4
AMPLIFIER ALIGNMENT
4.1 Recommended Test Equipment List
To align the transmitter the following test equipment is recommended:
M-2/M3 rack/system monitor
Power supply: regulated 28.0 volt DC @ 5 A
Wattmeter: (e.g. Bird 4421)
Spectrum Analyzer (e.g. IFR 7550)
Alignment Tool, Johanson type 8777
Daniels Extender Card, EC-48R or EC-48UK
SWR Meter, 50 W 200 MHz
Power pad 50 ohm splitter (e.g. Socal)
Dummy Load 50Ω /50W
Dummy Loads, 2:1 and 3:1, /50W
Current Meter (5A)
DC Voltmeter
DANIELS
TM
ELECTRONICS LTD.
25W AM Power Amplifier Instruction Manual
IM71-AMP3A130-25
4-1
Figure 1 RF Power Amplifier Board Alignment Locations
DANIELS
TM
ELECTRONICS LTD.
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4.2 RF Amplifier Board Alignment
Refer to Figure 1 for location of adjustment capacitors.
This procedure assumes the use of 2 separate subracks with the exciter transmitter in system A and
the 25W power amplifier in system B.
1. Remove the top extrusion cover housing from the exciter, set the exciter frequency at
128MHz (channel number 1200) and install the exciter in the system A of the M-2
or M-3 subrack. Remove all receivers from the subrack assembly (this will facilitate
calibration access).
2. Install the extender card in the designated location for the AMP3A130-25 Power
Amplifier (System B). Connect the RF output of the exciter to the input of the
power amplifier module and the output to a Communications Service Monitor.
3. Apply +13.8Vdc to the subrack system A and +28Vdc to the subrack system B,
activate the exciter transmitter and the power amplifier.
4. Turn the power adjustment potentiometer R19 in the exciter to achieve approximate
25W RF output. R19 is labeled "RF Level" and is accessed through the bottom of
the exciter transmitter amplifier case.
5. Monitor the RF power output and adjust C2, C3 and C10 on the RF power amplifier
board for maximum output power and minimum current. Check that the RF output
power is within 25W±1dBc (app. 20%) when the exciter frequency is set to 118,
128 and 138MHz (channel number 0000, 1200 and 2400). Note that C2 and C3 are
more effective in adjusting the output "flatness" over frequency.
6. Apply 1k/-25dBm AF signal into the balanced input of the exciter and adjust the
potentiometer R35 in the exciter to get 30% modulation. R35 is accessed through
the bottom of the exciter transmitter amplifier case, labeled Audio Level. Increase
the audio signal level to –8dBm, the modulation level should be 90±5% and the
audio distortion should be below 10%. Adjust C10 on the RF power amplifier
board for minimum audio distortion and maximum RF output power.
7. Confirm that the audio distortion is below 10% at 90% modulation and the RF
output power is within 25W±1dB at 0% modulation when the exciter frequency is
set to 118, 128 and 138MHz, respectively. Go back to step 4 if these specifications
are not met.
DANIELS
TM
ELECTRONICS LTD.
25W AM Power Amplifier Instruction Manual
IM71-AMP3A130-25
4-3
Figure 2 Control Board Alignment Locations
DANIELS
TM
ELECTRONICS LTD.
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4.3 Control Board Alignment
1. After completion of the amplifier alignment, using the RF Level potentiometer in the
exciter, set the RF output of the power amplifier to 10 watts. LED1 (labeled RF
Power) should be on, otherwise adjust pot R1 until LED1 is just visible. This
threshold may be adjusted to any RF power output level for the AMP-3 (10 –
25W).
2. Disconnect the power amplifier RF output and terminate it with the 3:1 mismatch
load. When activating the exciter, the LED2 (labeled High VSWR) should be on,
otherwise adjust pot R19 until LED2 turns on.
3. Terminate the power amplifier RF output with a 50Ω load. LED2 should be off, if
not, slightly turn the pot R19 counter-clockwise until the LED2 is off and check that
LED2 turns on when the power amplifier RF output is terminated with the 3:1
mismatch load.
4. Disconnect the RF terminal on the load, so that the power amplifier load is open.
Once the exciter is activated, verify that LED3 (labeled Overload) is on and the
power amplifier has no RF output power. If this is not the case, shut down the
exciter, adjust R18 and reactive the exciter. This confirms that antenna VSWR
overload protection works properly.
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5
ILLUSTRATIONS AND SCHEMATIC DIAGRAMS
5.1 Rack Mounting Positions
25 WATT POWER AMPLIFIER
8843M1
DANIELS
TM
ELECTRONICS LTD.
25W AM Power Amplifier Instruction Manual
IM71-AMP3A130-25
5-1
5.2 RF Power Amplifier Block Diagram
COOLING FAN
FRONT PANEL
REAR CONNECTOR
CONTROL BOARD
LED ARRAY
REMOTE POWER
O/P FAIL
RF POWER
HIGH VSWR
Driver
REMOTE VSWR
OVERLOAD
OVER TEMP
PTT
LOGIC CONTROLLER
PWR SWITCH
+28VDC
ON
OFF
PWR Supply
RF INPUT
SAMPLE
I/P ATT.
RF IN
THERMOSTAT
POWER DETECTOR
INPUT MATCHING
NETWORK
LOW PASS PILTER
RF OUT
OUTPUT MATCHING
NETWORK
DIR. COUPLER
POWER AMPLIFIER BOARD
AMP3A130M2
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5.3
POWER AMPLIFIER EXPLODED VIEW
HEAT SINK
POWER AMPLIFIER
14HP CASE
BACK BLOCK
Sli
de
PC
int
os
lot
POWER AMPLIFIER SHIELD
RF AMPLIFIER BOARD
FRONT BLOCK
COOLING FAN
CONNECTOR
Instructions
1. Remove the 4 Front Panel screws (A).
CONTROL BOARD
2. Remove the Power Amplifier Case.
3. Unplug the Cooling fan connector.
4. Remove the 4 Front Panel screws (A) holding the Front Panel to the Front Block.
5. To remove the Sensor Board, remove the 4 screws (E) on the Sensor Board,
and unplug the connectors which connct the Sensor Board and RF Amplifier Board.
6. To remove the RF Amplifier Board, remove 10 screws (E) and lockwashers (F) holding the RF
Amplifier Board to the heat sink, and 2 cap screws (G) holding the RF transistor to the heat sink.
7. To remove the Front Block, remove 2 screws (D) holding the Front Block to the heat sink.
8. To remove the Back Block, remove the 2 screws (D) holding the Back Block to the heat sink.
9. To remove the Cooling Fan, remove the 2 screws (B), lockwachers (I) and nutes (H).
10. Assembly is the reverse of step1 through 8.
POWER AMPLIFIER FRONT PANEL
25W AM Power Amplifier Instruction Manual
IM71-AMP3A130-25
AMP3A130M3
5-3
5.4
5-4
RF Power Amplifier Board - Component Layout
25W AM Power Amplifier Instruction Manual
IM71-AMP3A130-25
A
5.5
25W AM Power AMP RF Amplifier Board Schematic
TM
DANIELS
ELECTRONICS LTD
25W AM Power AMP Instruction Manual
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IM71-AMP3A130-25
5.6
Control Board - Component Layout
DANIELS
TM
VICTORIA B.C .
ELECTRONICS LTD.
TITLE: 25W AM POWER AMPLIFIER CORTROL BOARD OUTLINE
5-6
25W AM Power Amplifier Instruction Manual
DATE: 12 JULY 2002
PCB No:
50104-04
DWG No: 50104
DWG REV DATE:
IM71-AMP3A130-25
A
5.7
25W AM Power Amp Control Board Schematic
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ELECTRONICS LTD
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6
PARTS LISTS
6.1 RF Power Amplifier Board Electrical Parts List
Ref
Desig
Description
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ELECTRONICS LTD.
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Ref
Desig
Description
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Ref
Desig
Description
Part No.
6.2 RF Power Amplifier Board Mechanical Parts List
Description
Part No.
Qty.
BACK BLOCK, DWG NO. 10596-02
CAP SCREW, M3x8 HEX SOCK-M2.5
FRONT BLOCK, DWG NO. 10595-02
HEAT SINK, DWG NO. 10594-03
LID, LPF SHIELD, DWG NO. 10601-01
LOCKWASHER, M3, SPLIT, A2 STEEL
PVB,
SCREW, M3 x 8, PAN/PHIL, A2
SCREW, M3 x 10, FLAT/PHIL, A2
SCREW, M3 x 6, FLAT/PHIL, A2
WALL, LPF SHIELD, DWG NO. 10600-01
TAB, GROUND, M3,14.5mm L,BR/Ni, DWG 10067-01
TBA
5816-3M0SH08S
TBA
TBA
TBA
5814-3M0LK00S
TBA
5812-3M0PP08S
TBA
5812-3M0FP06S
TBA
3702-67802005
10
10
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6.3 Control Board Electrical Parts List
Ref
Desig
Description
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Desig
Description
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Ref
Desig
Description
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6.4 Control Board Mechanical Parts List
Description
Part No.
Qty.
FUSE CLIP, RIVET MOUNT
PA FRONT PANEL, DWG 10582-03
HANDLE/NAMEPLATE KIT, 28HP, GREY
FAN, 12VDC, 60X60X25mm, 20CFM
TBA
TBA
TBA
TBA
M33455-16, NIDEC
TBA
50-57-9402, MOLEX
5021-TF22B002
CONN., .100”, CRIMP HOUSING, 2CCT
TERMINAL, CRIMP, FEM., 22-24,Au
GUARD, FOR 60mm SQ. FAN, STEEL
TUBING, TFE-260C, 8AWG T/W, CLR
FUSE, 8 AMP FAST-BLO
CASE, 14HP RF PLUG-IN, MT-3 PA
GASKET, BeCu, 3FINGER, 71",CLIP
SCREW, M4 X 35, PAN/PHIL., A2
LOCKWASHER, M4, SPLIT,A2 STEEL
NUT, M4, HEX, 6.9mm FLATS, A2
NUT, PRESS,M2.5, 5.6mmOD, PC MNT
SCREW, M3 x 8,OVAL C/S/PHIL,A2
SCREW, M3 x 8, PAN/PHIL, A2
SCREW, M2.5 x 10 PAN/PHIL, A2
DANIELS
6519-60602R0S
7610-260C08TW
5604-5GAGC080
TBA
DWG 10581-03
5630-12023250
5812-4M0PP35S
5814-4M0LK00S
5813-4M0HX69S
5833-T2M55615
5812-3M0VP08S
5812-3M0PP08S
5812-2M5PP10S
Ref. Desig
8.5”
F1
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7
Issuei
REVISION HISTORY
Issued
Revised
July 2002
Details
First Issue
When a revision letter is assigned, it indicates that a revised issue has been released for in-house
distribution only.
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Modify Date                     : 2002:12:23 10:46:02-08:00
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