sunair ASB-850 User manual

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PRODUCT SERVICE:
ln case of difficulty please contact the Sunair Product Service
Department between the hours of 8:00 AM and 5:00 PM
Eastern Time, or write ta:
Product Service Dept.
Sunair Electronics, LLC
3400 SW 60th Ave.
Ocala, FI. 34474
U.S.A.
Telephone: [phone]
Fax: [phone]
Email: [email protected]
TRAINING:
Sunair offers training programs of varying lengths covering operation,
service and maintenance of ail Sunair manufactured equipment. For
details please Contact Product Services Department.
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SUNAIR ASB-850
TABLE OF CONTENTS
Section Page
GENERAL INFORMATION
1. 1 Scope . . . . . . . 1-1
1. 2 Trans.r.eiver Description 1-1
1.3 Technical Specifications 1-3
1.4 Equipment Supplied 1-5
1.5 Equipment Required but
Not Supp!ied . . . 1-5
1.6 Optional Equipment -Not
Supplied . . . . . .
1-6
II INSTALLATION
2.1 General . . . . . . .
2. 2 Unpacking and Inspection
2.3 Reshipping Information .
2.4 General Installation and
Mounting Information .
2.5 Power Requirements . .
2.6 Grounding Requirements.
2. 7 Cable Fabrication
2.8 Antenna Installation
2-1
2-1
2-1
2-2
2-2
2-2
2-2
2-3
III OPERATION
3.1 System Controls and Connectors. 3-1
3.2 Checks After Installation 3-4
IV THEORY OF OPERATION
i
4.1 General . . . . 4-1
4.2 Synthesizer (1A4) 4-1
4. 2.1 General 4-1
4.2.2 Spectrum Generator (1A4Al)4-l
4. 2.3 Low Digit Generator
(1 A4A2) . . . . . 4-2
4. 2.4 Translator (1 A4A3) . . 4-6
4.2.5 V.H.F. Divider
(1 A4A4) 4-7
4.2.6 V.C.O. (1A4A5) 4-9
4.2.7 Synthesizer Mother Board
(1A4A6) . . . . . . 4-11
4.2.8 Temperature Compensated
Crystal Oscillator . . . 4-11
Section
Page
4.3 Receiver . . . . . . . . . .
4.3. l General . . . . . . . .
4.3.2 VHF Mixer Board
(1A3Al)
4.3.3 IF/Fi!ter Board (IA3A2)
4-11
4-12
4-12
4-13
4-15
4-16
4-16
4.4
4.5
4.6
4.7
4.8
4.3.4 Audio Board (1 A3A4)
Exciter . . . . . . . . .
4.4.1 General . . . . .
.· .
4.4.2 Sideband Generator Board
(1A3A3)" . . . . . 4-17
4.4.3 IF/Fi!ter Board
(IA3A2) . 4-18
4.4.4 VHF Mixer(! A3AI ,Transmit) 4-18
4.4.5 Compressor Board
(1 AS) 4-19
Switching Regulator
(1 A6) 4-20
4.5.1 General . . . . . . 4-20
4.5.2 Switching Regulator . 4-20
4.5.3 5 Volt OC Regulator . 4-20
Filter Assembly (IA2) 4-20
Control Head (2A) . . . . 4-20
Amplifier/Coupler Unit (ACU-810) 4-21
4.8.1 General . . . . . . 4-21
4.8.2 Power Amplifier (3A6) 4-21
4.8.3 Filter Module (3A7) 4-22
4.8.4 Antenna Coupler . . 4-22
4.8.4.1 General . . 4-22
4.8.4.2 Pad, Phase and
Amplitude
Detectors(3A1Al)4-23
4.8.4.3 Control Logic(3A2) 4-24
4.8.4.4 Phase & Amplitude
Control (3A3) . 4-30
4.8.4.5 C3 and C6 Control
(3A4) . . . . 4-38
4.8.4.6 Servo Motor Con-
trol (3A5) . . 4-42
4.8.4.7 Regulator-Detector
(3A8A2) . . . 4-43
4.8.4.8 CI Assembly(3A9) 4-43
4.8.4.9 L4Assembly(3A10) 4-44
4.8.4.10
C3 & C6 Antenna
Modification
Capacitors(3A11) 4-44
4.8.4.11 Typical Tuning
Sequence . . . 4-44
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SUNAIR ASB-850
TABLE OF CONTENTS (
Section Page Section Page
V MAINTENANCE AND REPAIR
5.1
General
5-1
5.6.2
IF/Filter Board (1A3A2) 5-30
5.2 Preventive Maintenance
5-1 5.6.3 Sideband Generator Board
5.3 Cover Removal
5-1
(lA3A3)
5-3 l
5.3. l Receiver/Exciter Assembly
5-1
5.6.4 Audio Board
(1 A3A4) 5-3 1
5.3.2 Remote Control
Unit.
5-1
5.6.5 Compressor Board (1 AS) 5-31
5.3.3 Amplifier/Coupler Unit .
5-1 5.7 Remote Control (2A) 5-32
5.4 Performance Test
5-1 5. 7.1
Fault Analysis 5-32
5.4.1 Test Equipment .
5-1
5.8 Power Amplifier/Coupler (3A).
5-33
5.4.2 Materials Required.
5-1
5.8. l Fault Analysis 5-33
5.4.3 Preliminary Preparations 5-2 5.8.2 Primary Voltages 5-37
5.4.4 Receiver/Exciter Test 5.8.3 Grounding Test
Thal Can
Procedures 5-4
Be Performed 5-40
5.5 Synthesizer . 5-7 5.8.4
PC Board Replacement 5-45
5.5.l
Fault Analysis 5-7 5.8.5
RF Power Amplifier
5.5.2 Subassembly Testing and Servicing . 5-50
Alignment 5-13 5.8.6 Periodic Maintenance. 5-5(
5.6 Receiver/Exciter Board Alignment 5-30 5.8.7 Removal
of Subassemblies . 5-5"
5.6. l V.H.F. Mixer Board
(1A3Al) . 5-30 5.9 Schematic Diagrams 5-53
LIST OF TABLES
Table Page Table Page
2.l
Antenna Kit Components
2-8 5.6 1 Khz Switch .
5-1 1
4.l Control Logic (3A2) Diode 5.7 1
OO hz Switch
5-1 2
Functions 4-28,29 5.8 Course Steering Voltage Readings 5-l2
4.2 Phase and Amplitude Control (3A3) 5.9 Display Segment Illumination
vs.
Diode Functions . 4-35,36 Driver
Input/Output.
5-3 2
4-3 7,38
4.3
C-3 and C6 Control (3A4) Diode 5.10 Fault Isolation Table . 5-33
Functions 4-41,42 5
.11
3XA1Al Connector Voltages 5-38
5
.1
Remote Control Test Positions 5-2 5.12 3XA8A2 Connector Voltages 5-39
5.2
10 Mhz Switch 5-9 5.13 3XA4 Connector Voltages . 5-41
5.3 1 Mhz Switch 5-9 5.14 3Xa2 Connector Voltages . 5-42
5.4 1
OO Khz Switch 5-10 5.15 3XA3 Connector Voltages . 5-43
5.5 10 Khz Switch 5-10 5.16 3XA5 Connector Voltages . 5-44
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1 SUNAIR ASB-850 1
LIST OF ILLUSTRATIONS
Figure Page Figure Page
2.1 Test Set-up to Check Synthesizer
Programming 2-4
5.12 Receiver/Exciter Main Frame
" " Band Switching
Test Set-up 2-4
Schematic
5-65
2.3 Typical
Antenna Configurations
2-6,7 5.13
Spectrum Genera tor Schematic
2.4 Antenna Kit Installation
2-8
(IA4Al) .
5-68,69
2.5 Antenna Grounding . 2-9 5.14 Low Digit Generator (1A4A2)
5-7 l
2.6 Feed~Thru lnsulator\ . 2-10 5.15
Translator Schematic (lA4A3) . 5-75
2.7 Insulated
Tension Unit
2-10
5.16 V.H.F. Divider (l A4A4)
5-79
2.8
Interconnect Wiring Diagram 5.17 V.C.O. Assembly (l A4A5)
5-8 I
ASB-850 . 2-1 1 5.18 Synthesizer Mother Board (1A4A6)
5-83
2.9 Cable
Fabrication
2-1 2
5.19 VHF Mixer Schematic (!A3Al)
5-85
2.10 AMP/Coup Outline
5.20
IF /Fil ter Schematic (! A3A2) 5-87
Dimensions, ACU-810 .
.. 2-13 5.21 Audio Board
(1A3A4)
5-89
2.l l AMP
/Coup Installation 5.22 Sideband Generator (1 A3A3)
5-9 l
Dimensions, ACU-81 0 . 2-15
5.23
Receiver/Exciter Mother Board
2.12 Receiver/Exciter Outline
(1A3A5) . 5-93
Dimensions,
RE-800
2-17
5.24
Compressor Board ( lA5)
5-95
2.13 Receiver/Exciter Installation
5.25 Switching Regu!ator (1 A6)
5-97
Dimensions,
RE-800
2-1 9
5.26 Filter Module (!A2) Intercon-
2. 14 Control Head Outline
nection Diagram 5-99
Dimensions, SCU-80 2-21
5.27
Odd Channel Fil ter Board (! A2A1)
5-l 01
3. J
Remote Contrai Head Front Panel. 3-3
5.28
Even Channel Filter Board (1A2A2)
5-J 03
4.J Receiver/Exciter Black Diagram. 4-3
5.29 Contra! Head (2A) Wiring
4.2 CA3053 Schematic of Ul and U2 .
4-14
Diagram 5-J 05
4.3 C3 and C6 Antenna
5.30 Decoder (2A l) Display (2A2)
Modification Capacitors
4-45 Boards . 5-J 07
4.4 C3 and C6 Antenna Modification 5.31
Power/ Amplifier Coupler
Capacitors (Rev. H or higher) 4-46
Interconnection Diagram 5-109
5. l Caver Removal for
5.32
Pact, Phase and Amplitude
ASB-850 Units
5-3
Detectors (3AlAl) . 5-111
5.2 Power Amplifier Test Set-up
5.33 Control Logic (3A2) . 5-113
Schematic
5-50
5.34 Phase and Amplitude Contrai (3A3)
5-1 l5
5.3 Receiver/Exciter Front Panel 5-5 5 5.35 C3
and C6 Contrai Assembly (3A4)
5-1 J7
5.4 Receiver/Exciter Top View
5-5 6
5.36 Servo Motor Contrai Assembly
5.5
Receiver/Exciter Bottom View
5-5 7
(3A5)
5-l 19
5.6 Remote Contrai Rear Panel
5-5 8 5.37
RF Power Amplifier Schematic
5.7 Remote Contra! Top View 5-59
(lA7Al) .
5-1 21
5.8
Remote Contra! Bottom View
5-60 5.38
Fil ter Module Assembly (3A 7) 5-l
23
5.9 Power Amplifier/Coupler
5.39
Regu]ator Detector Assembly
Front Panel . 5-6 J
(3A8A2) . 5-l
25
5. IO Power Amplifier Antenna Coupler
5.40 Cl Assembly (3A9)
5-127
Chassis Right Side 5-62
5.4 J L4 Assembly
(3Al0).
5-l 28
5. l l
Power Amplifier Antenna Coupler
5.42
C3 and C6 Assembly . 5-129
Chassis
Left Side . 5-63 5.43
Filter Module Assembly (3A7) 5-130
iii
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SUNAIR ASB-850
SECTION l
GENERAL
INFORMATION
1.1 SCOPE
The installation manual contains the necessary
information. to install and operate the ASB-850
Airbome Transceiver. The maintenance manual
contains additional information necessary to test
and
repair the transceiver.
1.2 TRANSCEIVER DESCRIPTION
1.2. l GENERAL
The ASB-850 is a high quality single sideband trans-
ceiver covering the frequency range of 2.0000 to
29.9999 MHz. Modes of operation are Upper Side-
band (USB), Lower Sideband (LSB), and Ampli-
tude Modulation (AME). The transceiver is fully
solid
state and frequency is synthesized in l OO Hz
steps. The unit is designed to meet FCC require-
ments for Part 87, and FAA TSO C3lc and C32c.
The ASB-850 is composed of three major assemb-
lies, the Receiver/Exciter (RE-800), the Remote
Contra! Head ISCU-80), and the Amplifier/Coup-
ler (ACU-8 l OJ.
l.2.2 RECEIVER/EXC!TER - !A
The receiver/exciter contains the synthesizer and
ail low level transmit and receive circuitry. The
synthesizer provides the local oscillation frequency
(selected fram the Remo te Contrai Head) in l OO Hz
steps. Ail
frequencies are derived from a Temper-
atur Compensated Crystal Oscillator !TCXO) which
pravides instant on frequency operation with no
warm up. The frequency stability is better than
:!: 0.6 X l o-6 Hz over the full specified ambient
temperature range of the radio. The long term
stability is :!: 5 X l o-7 per year, permitting long
intervals between calibration.
The receiver/exciter circuits employ high quality
crystal filters bath in the front end of the radio
and in the IF section for sideband selection. The
first I.F. is well above the 30 MHz upper limit of
the transceiver, praviding the unusually high spuri-
ous sign.al rejection found only in this frequency
scheme.
A bandpass filter module is included in the receiv-
er/exciter unit to remove harmonies from the
exciter and eliminate out of band interference in
the receiver.
A plug-in
switching regulator assembly, efficiently
con verts t_he 27.5 VDC aircraft power to + 12 VDC
and + 5 VDC for use by the low level circuitry and
digital integrated circuits.
A speech compressor and receiver squelch are sup-
plied on a plug-in board. This board may be rewired
to pravide r.f. gain contrai in place of squelch, if
desired.
l.2.3 REMOTE CONTROL -2A
The remote contrai head contains the switches
which supply digital frequency information to the
synthesizer in the receiver/exciter unit, and to the
LED display drivers. Also included are the VOL-
UME and SQUELCH contrais, an auxiliary DIM-
MER contrai, coupler status lights, and a push-
botton MODE switch.
Both printed boards used in the control head are
plug-in for easy removal and servicing.
l.2.4 AMPLIFIER/COUPLER - 3A
This unit takes the Jow level rf signal from the
receiver/exciter unit and increases the power level
to 1 OO watts PEP. The amplifier output is rauted
thraugh a Jow pass filter module to suppress the
harmonies, and then fed to the automatic antenna
coupler, where it is impedance matched to the an-
tenna. The power amplifier is an ail solid state linear
1-1
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1 SUNAIR ASB-850 1
broadband unit with no frequency dependent
components. The unit is cooled by an integral
heatsink and
is protected from damage by internai
Automatic Level Control (ALC) circuits.
The antenna coupler is connected to the 50 ohm
1-2
power amplifier output and automatically matches
the antenna impedance to 50 ohms.
The coupler is designed to tune the wide variety of
HF antennas that are installed on various aircraft
See para 2.8 for antenna types.
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