sunair ASB-850 User manual


The document reference is online, please check the correspondence between the online documentation and the printed version.

(
(
(
The document reference is online, please check the correspondence between the online documentation and the printed version.

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.
The document reference is online, please check the correspondence between the online documentation and the printed version.

(
(
/
\
The document reference is online, please check the correspondence between the online documentation and the printed version.

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
The document reference is online, please check the correspondence between the online documentation and the printed version.

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
(
\
ii
The document reference is online, please check the correspondence between the online documentation and the printed version.

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
The document reference is online, please check the correspondence between the online documentation and the printed version.

(
1 THIS PAGE INTENTIONALL Y LEFT BL.ANK. 1 (
(
The document reference is online, please check the correspondence between the online documentation and the printed version.

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
The document reference is online, please check the correspondence between the online documentation and the printed version.

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.
(
!
\
The document reference is online, please check the correspondence between the online documentation and the printed version.

1.3 TECHNICAL SPECIFICATIONS
Elcctrical and physical specilïcations of the Sunair
ASB-850 Transceiver arc listed below.
1.3. I GENERAL
APPROVALS
U.S. FCC type accepted to part 87.
U.S. FAA authorized to TSO C3 Ic and C3 2c.
FREQUENCY RANGE:
2.0 to 29.9999 MHz ( 100 Hz lncrements).
NUMBER
OF CHANNELS:
280.000. Synthesized.
FREQUENCY RESOLUTION:
100
Hz.
FREQUENCY STABILITY.
± :20 Hz 1naximum over r:.itcd temperJture
range.
OPERATING MODES:
USB. LSB. AME.
DUTY CYCLE:
Voice. Continuous.
ENVIRONMENTAL CATEGORY:
BAAAAX, TSO C3 Ic and C32c
ALTITUDE:
30.000 Ft.
TEMPERATURE
Non-opcrating: -
SOOC to + 71 oc
Short Term opera ting:: + 71 oc
Operating: -460C to + 5 soc.
VIBRATION:
10 to 500 Hz. 5g peak (TSO Cat. A).
(Control head: 10 to 500 Hz 1.5G max.
0.:'5 max acceleration IT50 Cat. C).
HUMIDITY
95é{ at sooc
SHOCK: 6g peak. 1 lms duration.
SUNAIR ASB-850
CRASH SAFETY:
J 5g peak. 11 ms duration.
POWER INPUT:
27.5 VDC +
IO~i. -20'/i. at 2.0 amp receive.
14 amp peak transmit.
DIMENSIONS:
Rcvr/Exctr: 112 ATR long case.
4.875W X 7.62H X
16.8Liinches)
12.38W X l9.37H X42.67LtCMl.
Add 1.6" H (4.13 cm) for shockmount.
Amp/Cplr: 1 /2 ATR long case.
4.875W X 7.625H X 19.SL linches
12.38W X l9.37H X 50.29L
iCM)
Add 1.6" H (4.13 cm) for shockmount.
Control Head: 5.75W X 2.625H X 5.0Uinches)
14.6W X 6.67H X l 2.7D iCM).
WEIGHT:
Rcvr/Exctr: 16.0 lbs (7.3 kg): 17.6 lbs (8 kg)
with shockmount.
Ampl/Cplr: 22.0 lbs ( 10 kg): 24 lbs ( 1O.9 kg)
with shockmount.
Control Head: 1.8 lbs iü.8 kg).
1.3.2 RECEIVER
SENSITIVITY: S + N
SSB:0.5 uv max into 50 ohms for 10 db -N-
S+ N
A~:: 3.0 uv max into 50 ohms for 10 db--
N
SELECTIVITY
SSB: 350
Hz maximum to 2500 Hz.
n1inin1un1
6.0 kHz max at -60db.
AM: 5.0 kHz minimum (a -6db
20 kHz maximum at -60db.
AUDIO OU.TPUT
50 mw into
600 ohms and 150 ohrns.
unbalanced.
AUDIO DISTORTION:
Less than 1 O'X at 50 mw.
1- 3
The document reference is online, please check the correspondence between the online documentation and the printed version.

1 SUNAIR ASB-850
CAJN:
10 uv nominal for 50 mw Audio Output.
IF REJECTION: Not Jess than -70db.
IMAGE REJECTION:
Not Jess than -80db.
AGC:
Fast attack. slow release. threshold 5 uv nomi·
nal: 1Odb audio change for 94db rf input
ch:.inge.
INTERNAL SPURIOUS RESPONSE:
99.5'.·; below equivalent 0.2 uv noise input at
antenna terniinals.
EXTERNAL SPURIOUS RESPONSE:
-65db below 1 Ocib
S + N reference.
N
1.3.3 TRANSMITTER
POWER OUTPUT
SSB: 1 OO watts PEP::': 1 db
AM: 40 watts carrier. nominal.
HARMONIC & SPUR!OUS SUPPRESSION -40db.
CARRIER SL'PPRESSION · 40 db.
L'NDESIRED SIDEBAND SUPPRESSION:
- 50 db la 1.5 kHz.
ll\TERMODULATION DISTORTION:
-29 db below 2 tone PEP output.
llUI Ac;[) \OISlc LlcVEL: - 40 db.
1.3.4 ANTENNA COUPLER
1-4
RF POWER CAPABIL.ITY: 100 watts average.
VSWR:
1.3: 1 or better typical: 1.5: 1 maximum.
TUNING TIME
3 seconds typical. 30 seconds maximum.•
*For standard test conditions using the fol!ow-
ing test antenna impedances:
a) 10 ft. grounded.
b) 29 ft. grounded.
c) 8 ft. grounded
d) Jetstar.
3) Mystere 20.
f) 707 tailprobe.
g) 34 ft. grounded.
For some frequency-impedance combinations with
other antennas, the tuning time may exceed 30
seconds.
ANTENNA MATCHING CAPABILITY:
Wire: 8 ft. to 80 ft. 12.4 m to 24.4 m) ground-
ed and ungrounded. Vee and long wire.
Whip: 8 ft. 12.4 m) and longer.
lntegral airframe. shunt and notch.
i
\
(
(
The document reference is online, please check the correspondence between the online documentation and the printed version.

1.4 EOUIPMENT SUPPLIED
The following table is a lis! of equipment, witn
their Sunair part numbers, supplied with the
ASB-850 Transceiver System.
1.41 Receiver/Exciter Assem bly, RE-800
1.42 Remote Control Head, SCU-80
l .4.3 Amplifier/Coupler Assembly, ACU-810
1.4.4 Operation and Maintenance Manual
l.4.5 Installation Kit,
Clamp, Cable, Connector
Connector, RF,
BNC UG-88/U
Connector, RF, HN UG-59B/U MOD
Clamp, Cable, Connector
Connector, Power, 26 Pin Round
Connector, Power,
~5 Pin Round
Connector, Power,
61 Pin Round
Connector, Power, 2 Pin Round
Connectcir, Power, 26 Pin Round
Connector, Power, 14 Pin Reet.
Reducing Adapter
Reducing Adapter
Cable Assy. UHF, 5 in Long
Manual, Maintenance, ASB-850
Mtg Rack Assy, RCV/Exc, RE-800
Mtg Rack Assy, PA/CPLR, ACU-810
Strap, Ground
Connector,.HN Adaptor
1.5 EOUIPMENT REOUIRED BUT NOT
SUPPLIED
1.5. I Antenna, wire or integral air frame.
1.5.2 Microphone, noise cancelling.
1.5.3 600 ohm Headphones or Speaker Driver
and Speaker.
1.5.4* Cable, l untrol. ACU-810/RE-800
1.5.5 Cable, Control, SCU-80/RE-800
1.5.6 Cable, Power. ACU-810
SUNAIR ASB-850
Sunair Part No.
8033100095
8033200090
8033300094
8033000708
8033001593
0740250001
0744030005
0753160005
0754270009
0754470008
0754490009
0754510000
0754530001
0754540006
0754940004
1001250001
1001250028
1001360001
8033000708
8033002794
8033003791
8033390603
8042390700
8040007003
8040007500
8033008504
1-5
The document reference is online, please check the correspondence between the online documentation and the printed version.

LiQNAIR ASB-850
1.5.7 Cable, Coax, RG-58
1.5.8 Cable, Sl'U-80 Audio to Aircraft System
• Ail cables may be fabricated by the installer
in accordance with figure 2.8.
1.6 OPTIONAL EOUIPMENT - NOT SUPPLIED
1.6.1 Encapsulated Anti-Precipitation Static Wire
Antenna Kit
1.6.2 Microphone, Noise Cancelling
1.6.3 Field Module Kit, ASB-850
1.6.4 Depot Spares Kit, ASB--850
1.6.5 Low Profile Ali Attitude Vibration Jsolator
Kit
1.6.6 Ancillary Kit
consists of:
Tool, Alignment
Tool, Alignment
Key, Hex Socket, Allen
Key, Spline, 6
Flute
Card Extender
Card Extender
Card Extender
1.6.7 Headphones
1.6.8 RG-8 Coaxial Cable
1.6.9 LSB Crystal Filter, 10.5 Mhz
1-6 CHANGE DATE NOVEMBEA 16, 1982
0588130001
(
Installer fa bricated
0951580001
0871510006
8033900091
8033900598
8033003804
8033100893
(
\
0878380001
0878400001
0882100009
0882460005
5024003098
8033101598
8033393114
0840180004
0588640000
8033005092
(
The document reference is online, please check the correspondence between the online documentation and the printed version.

CAUTION
TO INSURE THAT CABLE HAS NOT BEEN DAMAGED DURING SHIPMENT,
ALL CABLE ASSEMBLIES MUST BE CHECKED FOR CONTINUITY OR SHORTS,
FROM PIN
TO PIN, BETWEEN CONNECTORS BEFORE INITIAL RADIO OR
SYSTEM POWER UP.
WARNING
CONNECTORS INSTALLED BY THE CUSTOMER MUST BE WIRED IN ACCORD-
ANCE WITH INSTALLATION INSTRUCTIONS PROVIDED IN THE OPERATION
AND MAINTENANCE MANUAL. THE CABLE MUST BE CONTINUITY CHECKED
AFTER INSTALLATION AND PRIOR TO RADIO OR SYSTEM POWER UP.
The document reference is online, please check the correspondence between the online documentation and the printed version.

(
1THIS PAGE INTENTIONALLY LEFT BLANK 1 (
(
The document reference is online, please check the correspondence between the online documentation and the printed version.

SUNAIR ASB-850
SECTION 2
INSTALLATION
2.1 GENERAL
Section 2 contains ail necessary instructions for the
unpacking, inspection. and if necessary reshipping of
damaged equipment or parts. ln addition further in-
formation regarding location and mounting consid-
erations. power requirements. antenna and ground
system hook-ups. and final checkouts after installa-
tion, are also provided.
2.2 UNPACKING AND INSPECTION
Un pack and inspect ail parts and equipment as soon
as received.
Be sure to retain the shippillK
carton a11J its associateJ pack·
ing rnateria/s shoulJ il be nece~·
sary to rC'ship Jama!(ed equip~
nzent.
Do not accept a shipment when there are visible
signs
of damage to the cartons until a complete
inspection is made. JI ·there is a shortage of item.
or any evidence of damage is noted, insist on a
notation to that effect on the shipping papers be-
fore signing the receipt from the carrier.
If concealed damage is discovered after a shipment
has been acccpted. notify the carrier immediately
in writing and await his inspection before making
any disposition of the shipment. A full report of
the damage should also be forwarded to Sunuir.
lnclude the following:
(a) Order Numbcr
(b) Madel and Serial Number
(L) Nume of Transportation Agency.
2.3 RESHIPPING INFORMATION
The shipping cartons for the ASB-850 have been
carefully designed to protect the transceiver and
uccessories during shipment. This carton and its
associated packing muterials should be used to
reship the radio.
If the original shipping carton is not available, be
sure
to carefully pack each unit separately, using
suitable cushioning muterial. Yery special attention
should be given to providing enough packing
material around contrais. connectors. and other
protrusions from the radio. Rigid cardboard should
be placed at the corners of the equipment to
protect against damage if the carton is dropped.
When returning one or more subassemblies for
repair, please ship AIR PARCEL POST consigned
to:
SUNAIR ELECTRONICS, INC.
3101SW3rd Avenue
Ft. Luuderdale. Florida 33315
U.S.A.
Plainly mark with indelible ink ail mailing docu-
ments as follows:
U.S. GOODS RETURNED FOR REPAIR
VALUE FOR CUSTOMS -$ I OO.OO
und be sure to mark 011 ail sides of the package
"FRAGILE - ELECTRONIC EQUIPMENT"
Be/ore shi1717inx. carefulfy in-
spect the packaxe Io be sure it
is 1narkeJ properf,1· and is secu·
rcly 11·rapped.
2-1
The document reference is online, please check the correspondence between the online documentation and the printed version.

SUNAIR ASB-850
2.4 GENERAL INSTALLATION AND MOUNT-
ING
INFORMATION
Satisfactory operation of this equipment will
depend upon the care and thoraughness taken
du ring installa lion.
2.4.1 GENERAL INSTALLATION
a. Carefully plan the Amplifier/Coupler antenna
installation to minimize the length of wire between
the coupler output and the antenna itself. This
lead
should be kept as short as physically possible,
6 inches or Jess is optimum. The wire inside the air-
craft is a part of the antenna, Mt will radiale
inside
the fuselage, no! outside. This energy may
cause
interference with other electrank equipment
in the vicinity. This in terference can often be
reduced by using high voltage coaxial cable such
as RG-8/U, between the coupler and the antenna
feedthraugh. The coax must be kept short because
coax Iengths longer than 3 feet can cause large
lasses,
particularly at the antenna resonant and
antiresonant frequencies, when VSWR exceeds 10.
b. The location of the Receiver/Exciter unit is
not critical, and may be placed anywhere there is
available space within the fuselage.
Installation of the Amplifier/
Coupler and R eceiver / Exci1er
must conform 10 the A lritude/
Temperature restrictions detail-
ed in the equipment specifica·
tians.
c. lnstall the Remo te Contrai Head in the cockpit
in any convenient location.
d.
The installations should be carefully planned
beforehand in accordance with the drawings on the
following pages.
2-2
2.5 POWER REOUIREMENTS
The ASB-850 is designed to operate from a
nominal 27.5 VDC + 10%. -20%, source. The sys-
tem should be connected to the source through the
aircraft circuit breaker panel, using a 20 ampere
breaker. The Receiver/Exciter receives aircraft 28V
thraugh a SA SB fuse mounted in the PA/Cplr.
Ali low level voltages used in the
Remote Contrai
are current limited to safe levels by voltage regula-
tors and do not require fusing. Power used in the
PA/Cplr
is fed through a 1 OA SB fuse located in
the PA/Cplr.
2.6 GROUNDING REOUIREMENTS
2.6.1 GENERAL
lt is very important that ail ground straps provided
on the mounting racks and the ground strap attach-
ed to the rear panel of the PA/Cplr be securely con-
nected to the aircraft frame. The radiation resistance
of some aircraft antennas is quite low, sometimes
Jess than 1 ohm at the lower frequencies. In order
not to decrease the efficiency the bonding straps
from the PA/Cplr must be very securely bonded
to the aircraft such that the resistance readings
should be in
the order of 1 milliohm or less from
the aircraft frame to the ground portion of the
antenna RF output connecter. 3AIJ6. Connecting
ail ground straps properly should result in an ade-
quate ground system.
2.7 CABLE FABRICATION
2.7.I GENERAL
The cabies listed in paragraph l.5 must be wired to
their appropriate connections as shown in Figure
2.8
lnterconnect Wiring Diagram. Cable
Fabrication is shown in Figure 2.9.
Ail cables are available from Sunair with the excep-
tion of the audio wiring from the contrai head con-
necter 2A3J 2. Since this wiring must be routed to
various locations in the aircraft instrument panel
the installer should fabricate this cable using st8n-
dard aircraft installation practices.
(
(
The document reference is online, please check the correspondence between the online documentation and the printed version.

2.7.2 CHECKS AFTER FABRICATION
2. 7.2. J SYNTHESIZER PROGRAMMING
Each cable must be checked for continuity and
shorts to other pins. Ali wiring is pin to pin:
"A" to "A", "B" to "B" etc, ln order to be certain
the synthesizer is being programmed correctly it
is
necessary that the exciter frequency be checked
with a counter as each decade frequency must be
checked from 0 to 9 to verify that the wiring of
cable 8040007500 is correct. See Figure 2. 1 for a
recommended test set-up to verify operation on
the bench.
Rota te each frequency switch thraugh ail l 0
positions and check for the correct frequency
readout on the counter.
2.7.2.2 BAND SWITCHING
Bandpass filters are located in the exciter unit
at the exciter output and low pass filters are
Jocated in the PA/Cplr unit at the output of the
power amplifier. These filters are automatically
switched by the JO MHz and 1 MHz frequency
switches in the contrai head.
Operation of these filters may be checked by
monitoring the power output of the PA in each
band.
Bands are divided as shown below:
Freq, MHz
2 -3
3 -4
4-6
6 - 9
9 - 13
13 - 20
20 -30
Band
2
3
4
5
6
7
Connect the equipment as shown in Figure 2.2.
Turn equipment ON and set mode switch to AM
and set frequency for the middle of each band,
Key microphone and check for power output in
each band. If the bands are not being switched
properly the power will be essentially zero on the
watt meter in the 11011-operating band. Note: The
SUNAIR ASB-850
PA filters are of the Jow pass type so a low band
frequency could pass through a higher band but
not the reverse.
2.7,2.3 MISCELLANEOUS CHECKS
Other functions that must be verified are shown
in chart form below, Functions such as audio,
squelch,etc are self explanatory and are not shown.
1 - VHF VCO Steer
2 - LO Digit Steer.
3 - Tune Command
4 - Fault Indication
5 - Tune Indication
6 -ACC
7 - ALC (V)
Symptons of Incorrect
Wiring
Sluggish
frequency Iock or
failure to Iock,
Same as 1.
Fa il ure of Coupler to start
tuning,
No fouit light when sys-
tem first tuned on.
No tune light and no fault
Jight after coupler has suc-
cessfully tuned antenna.
AM power output exces-
sively high, over 50 watts.
No SSB power contrai,
signal nat tapping and ex-
cessive power reading on
wattmeter when talking
into microphone (over 50
watts),
2.8 ANTENNA INSTALLATION
2.8, 1 GENERAL
The installation of a high frequency antenna on an
aircraît involves the consideration of several factors.
The shape or configuration of the antenna must
allow the transceiver to transmit and receive as
required by the user. The user or aircraft owner
also usually has a requirement regarding appearance
and tlight qualities of the antenna and of course
these should be considered by the installer also.
However. as occurs in most things in nature.
2-3
The document reference is online, please check the correspondence between the online documentation and the printed version.

1 SUNAIR ASB-850
2-4
28V P.S.
5A
Watt
Meter
50'1
Lo ad
J2
PA/CPLA
J1
-
Aec/Exc
RF
'
J2
1 1
@@@
Contrai
Head
J1
/
RG-58
_L
-
-
~27
n
y,
w
~27
n
Figure 2.1 Test Set-up To Check Synthesizer Programmlng
2 ta 30 MHz
High lmpedence
Counter
Iflow impedance counter
used
(50n) it may be
connected directly to exciter
output if its input circuit
will
not be damaged by signais up
ta 4Y peak ta peak.
No Connectîon"'
PA out
JJ
*
i'-Js
Contrai
PA/CPLA
J1
J4
R/F
J2
28 V P.S.
15A
J2
AEC/EXC
Contrai
J1
RF
Head
* TO CHECK COUPLER TUNING REMOVE 50 OHM
LOAD
AAND WATT METER,USE SIMULATED ANTENN
I7.5KV
l'""'
!OO WATTS
50 pl
10 100
RESISTORS 1N
PARALLEL,
(SUNAIR PA
016097000
RT NO.
8)
TNO. SUNAIR PAR
029020008
Figure 2.2 Band Switching Test Set·up
(
'
(
(
The document reference is online, please check the correspondence between the online documentation and the printed version.