Harris RF Communications Division MX 9325 User Manual
PUBLICATION NUMBER: 10515-0152-4300
Air Traffic Control Communications
MX-9325
TRANSCEIVER
INTERMEDIATE MAINTENANCE
MANUAL
JUNE 2000
Rev. 02
next level solutions
No export or re-export is permitted without written approval from the U.S. Government.
The material contained herein is subject to U.S. export approval.
LIMITED ONE YEAR WARRANTY
HARRIS CORPORATION (RF COMMUNICATIONS DIVISION)
FROM HARRIS TO YOU – This warranty is extended to the original buyer and applies to all Harris Corporation, RF
Communications Division equipment purchased and employed for the service normally intended, except those products
specifically excluded.
WHAT WE WILL DO – If your Harris Corporation, RF Communications Division equipment purchased from us for use outside the
United States fails in normal use because of a defect in workmanship or materials within one year from the date of shipment, we
will repair or replace (at our option) the equipment or part without charge to you, at our factory . If the product was purchas ed for
use in the United States, we will repair or replace (at our option) the equipment or part without charge to you at our Authorized Repair
Center or factory.
WHAT YOU MUST DO – You must notify us promptly of a defect within one year from date of shipment. Assuming that Harris
concurs that the complaint is valid, and is unable to correct the problem without having the equipment shipped to Harris:
• Customers with equipment purchased for use outside the United States will be supplied with information for the return
of the defective equipment or part to our factory in Rochester, NY, U.S.A., for repair or replacement. You must prepay
all transportation, insurance, duty and customs charges. We will pay for return to you of the repaired/replaced equipment
or part, C.I.F. destination; you must pay any duty, taxes or customs charges.
• Customers with equipment purchased for use in the United States must obtain a Return Authorization Number, properly
pack, insure, prepay the shipping charges and ship the defective equipment or part to our factory or to the Authorized
Warranty Repair Center indicated by us.
Harris Corporation Telephone: (716) 244-5830
RF Communications Division Fax: 716-242-4755
Customer Service
1680 University Avenue
Rochester, NY 14610, U.S.A.
http://www.harris.com
Harris will repair or replace the defective equipment or part and pay for its return to you, provided the repair or replacement is due
to a cause covered by this warranty.
WHAT IS NOT COVERED – We regret that we cannot be responsible for:
• Defects or failures caused by buyer or user abuse or misuse.
• Defects or failures caused by unauthorized attempts to repair or alter the equipment in any way.
• Consequential damages incurred by a buyer or user from any cause whatsoever, including, but not limited to
transportation, non-Harris repair or service costs, downtime costs, costs for substituting equipment or loss of anticipated
profits or revenue.
• The performance of the equipment when used in combination with equipment not purchased from Harris.
• HARRIS MAKES NO OTHER WARRANTIES BEYOND THE EXPRESS WARRANTY AS CONTAINED HEREIN. ALL
EXPRESS OR IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY A R E
EXCLUDED.
SERVICE WARRANTY – Any repair service performed by Harris under this limited warranty is warranted to be free from defects
in material or workmanship for sixty days from date of repair. All terms and exclusions of this limited warranty apply to the service
warranty.
IMPORTANT – Customers who purchased equipment for use in the United States must obtain a Return Authorization Number
before shipping the defective equipment to us. Failure to obtain a Return Authorization Number before shipment may result in a
delay in the repair/replacement and return of your equipment.
IF YOU HAVE ANY QUESTIONS – Concerning this warranty or equipment sales or services, please contact our Customer Service
Department.
PUBLICATION NUMBER: 10515-0152-4300
MX-9325
TRANSCEIVER
JUNE 2000
Rev. 02
The material contained herein is subject to U.S. export approval. No export or
re-export is permitted without written approval from the U.S. Government.
Information and descriptions contained herein are the property of Harris Corporation. Such information
and descriptions may not be copied or reproduced by any means, or disseminated or distributed without
the express prior written permission of Harris Corporation, RF Communications Division, 1680 University
Avenue, Rochester, New York 14610-1887.
Copyright 2000
By Harris Corporation
All Rights Reserved
Firmware Release: rev. TBD
HARRIS CORPORATION RF COMMUNICATIONS DIVISION
1680 University Avenue Rochester, New York 14610-1887 USA
Tel: 716-244-5830. Fax: 716-242-4755. http://www.harris.com
MX-9325
When an Adult Stops Breathing
WARNING
DO NOT attempt to perform the rescue breathing techniques provided
on this page, unless certified. Performance of these techniques by
uncertified personnel could result in further injury or death to the victim.
Does the Person
Respond?
1
Tap or gently shake
victim.
Shout, “Are you OK?”
Roll Person
Onto Back
3
Roll victim toward you
by pulling slowly.
Open Airway
4
Tilt head back and lift
chin.
Give 2 Full
Breaths
6
Keep head tilted back.
Pinch nose shut.
Seal your lips tight
around victim’s mouth.
Give 2 full breaths for
1 to 1-1/2 seconds each.
Shout, “Help!”
2
Call people who can
phone for help.
Check for
Breathing
5
Look, listen, and feel
for breathing for
3 to 5 seconds.
Check for Pulse
at Side of Neck
7
Feel for pulse for
5 to 10 seconds.
Begin Rescue
Breathing
9
Keep head tilted back.
Lift chin.
Pinch nose shut.
Give 1 full breath
every 5 seconds.
Look, listen, and feel for
breathing between breaths.
For more information about these and other life–saving techniques, contact your Red Cross chapter for training.
ii
“When Breathing Stops” reproduced with permission from an American Red Cross Poster.
Phone
for Help
8
Send someone to call
an ambulance.
Recheck Pulse
10
Keep head tilted back.
Feel for pulse for
If victim has pulse but is
Every Minute
5 to 10 seconds.
not breathing, continue
rescue breathing. If no
pulse, begin CPR.
MX-9325
SAFETY SUMMARY
SAFETY SUMMARY
1. INTRODUCTION
All operators and maintenance personnel must observe the following safety precautions during operation and
maintenance of this equipment. Specific warnings and cautions are provided in the manual and at the end of this
Safety Summary. Warnings, Cautions, and Notes appear before various steps in the manual and will be used as
follows:
• WARNING – Used when injury or death to personnel and damage to equipment is possible
• CAUTION – Used when there is a possibility of damage to equipment
• NOTE – Used to alert personnel to a condition that requires emphasis
2. PERSONNEL AND EQUIPMENT SAFETY
Basic safety precautions consider factors involved in protecting personnel from injury or death. Electrical,
mechanical, EMR, material, or chemical hazards are the most common types of hazards found in electronic
equipment. The following are types of hazards that may exist:
ELECTRICAL – Hazardous voltage and current levels may exist throughout the equipment. Contact
with these hazards could cause electrocution, electrical shock, burns, or injury due to
involuntary reflexes of the body.
MECHANICAL – Mechanical hazards are created when heavy assemblies and components must be
removed and replaced. Moving parts (such as fan blades) and hot surfaces are
potential mechanical hazards.
THERMAL – Burn hazards may exist in the equipment that could cause personal injuries and/or
serious equipment damage. Internal surfaces of the equipment may be in excess of
65°C, the point at which personnel could be burned. Extreme caution should be used
when working with any hot assemblies (for example, power supply or power amplifier
assemblies). Physical injury or damage may result to personnel and/or equipment as a
result of a reflex action to a burn.
CHEMICAL – Chemicals or materials used for servicing the equipment may present potential
hazards. Many chemical agents, such as cleaners and solvents, may be toxic, volatile,
or flammable. If used incorrectly, these agents can cause injury or death.
EMR – Overexposure to electromagnetic radiation results from amplified radio frequencies
that may produce a health hazard.
xi
MX-9325
SAFETY SUMMARY
3. OPERATIONAL AND MAINTENANCE SAFETY GUIDELINES
Good safety discipline is critical to prevent injury to personnel. All other safety measures are useless if personnel
do not observe the safety precautions and do not follow safety disciplines. Once aware of a hazard, personnel
should ensure that all other personnel are aware of the hazard. The following basic safety disciplines are stressed:
a. Read a procedure entirely before performing it. Personnel must always perform each assigned task in a
safe manner.
b. Prior to applying equipment power after maintenance, personnel must ensure that all unsecured hand
tools and test equipment are disconnected from the serviced/maintained equipment and properly stored.
c. Power to the equipment must be removed before a piece of equipment is removed.
d. Extreme care must be used when adjusting or working on operating equipment. Voltages in excess of
70 V or current sources in excess of 25 A are covered with barriers. Barriers include warning information
about the hazard encountered upon barrier removal.
e. Personnel must react when someone is being electrically shocked. Perform the following steps:
1. Shut off power.
2. Call for help.
3. Administer first aid if qualified.
Under no circumstances should a person come directly in contact with the body unless the power has
been removed. When immediate removal of the power is not possible, personnel must use a
non-conductive material to try to jolt or pry the body away from the point of shock.
f. Personnel should work with one hand whenever possible to prevent electrical current from passing
through vital organs of the body. In addition, personnel must never work alone. Someone must be
available in the immediate area to render emergency first aid, if necessary.
g. Lifting can cause injury. Items weighing more than 37 pounds must be lifted by two or more people.
h. Some electrolytic capacitors contain aluminum oxide or tantalum. If connected incorrectly, the capacitor
will explode when power is applied. Extreme care must be used when replacing and connecting these
capacitors. The capacitor terminals must always be connected using the correct polarity: positive to
positive and negative to negative.
xii
MX-9325
SAFETY SUMMARY
The next section contains general safety precautions not directly related to specific procedures or equipment.
These precautions are oriented toward the maintenance technician. However, all personnel must understand and
apply these precautions during the many phases of operation and maintenance of the equipment. The following
precautions must be observed:
DO NOT SERVICE EQUIPMENT ALONE
Never work on electrical equipment unless another person familiar with the operation and hazards of the
equipment is near. When the maintenance technician is aided by operators, ensure that operators are aware of
the hazards.
GROUNDING
Always ensure that all equipment and assemblies are properly grounded when operating or servicing.
TURN OFF POWER AND GROUND CAPACITORS
Whenever possible, power to equipment should be turned off before beginning work on the equipment. Be
sure to ground all capacitors that are potentially dangerous.
KEEP AWAY FROM LIVE CIRCUITS
Operators and maintainers must observe all safety regulations at all times. Do not change components or
make adjustments inside equipment with a high voltage supply on unless required by the procedure. Under
certain conditions, dangerous potentials may exist in circuits with power controls off, due to charges retained
by capacitors.
DO NOT BYPASS INTERLOCKS
Do not bypass any interlocks unnecessarily. If it is necessary to employ an interlock bypass for equipment
servicing, use extreme care not to come in contact with hazardous voltages.
USE CARE HANDLING HEAVY EQUIPMENT
Never attempt to lift large assemblies or equipment without knowing their weight. Use enough personnel or a
mechanical lifting device to properly handle the item without causing personal injury.
HEED WARNINGS AND CAUTIONS
Specific warnings and cautions are provided to ensure the safety and protection of personnel and equipment.
Be familiar with and strictly follow all warnings and cautions on the equipment and in technical manuals.
PROTECTIVE EYEWEAR
All personnel must wear protective eyewear when servicing or maintaining equipment. Protective eyewear
must be worn at all times when using tools.
xiii
MX-9325
SAFETY SUMMARY
4. PROTECTION OF STATIC-SENSITIVE DEVICES
Diode input-protection is provided on all CMOS devices. This protection is designed to guard against adverse
electrical conditions such as electrostatic discharge. Although most static-sensitive devices contain protective
circuitry, several precautionary steps should be taken to avoid the application of potentially damaging
voltages to the inputs of the device.
To protect static-sensitive devices from damage, the following precautions should be observed.
a. Keep all static-sensitive devices in their protective packaging until needed. This packaging is
conductive and should provide adequate protection for the device. Storing or transporting these
devices in conventional plastic containers could be destructive to the device.
b. Disconnect power prior to insertion or extraction of these devices. This also applies to PWBs
containing such devices.
c. Double check test equipment voltages and polarities prior to conducting any tests.
d. Avoid contact with the leads of the device. The component should always be handled carefully by
the ends or side opposite the leads.
e. Avoid contact between PWB circuits or component leads and synthetic clothing.
f. Use only soldering irons and tools that are properly grounded. Ungrounded soldering tips or tools
can destroy these devices. SOLDERING GUNS MUST NEVER BE USED
5. EXPLANATION OF HAZARD SYMBOLS
The symbol of drops of a liquid onto a hand shows that the material will cause burns or
irritation of human skin or tissue.
The symbol of a person wearing goggles shows that the material will injure your eyes.
The symbol of a flame shows that a material can ignite and burn you.
The symbol of a skull and crossbones shows that a material is poisonous or a danger to life.
.
xiv
The symbol of a human figure in a cloud shows that vapors of a material present danger to your
life or health.
MX-9325
TRANSCEIVER
MX-9325
GENERAL INFORMATION
MX-9325
GENERAL INFORMATION
Figure 1-1. MX-9325 Transceiver
9325-001
MX-9325
GENERAL INFORMATION
CHAPTER 1
GENERAL INFORMATION
1.1 INTRODUCTION
This manual provides the technician with all technical information required to support level III maintenance as
described in Appendix B.
The overall intent of this manual is to help the technician expedite repair of the unit in a reasonable amount of
time, resulting in reduced down-time and increased system availability. Detailed information that is useful to the
technician is provided: configuration, specifications, fault isolation, repair, tools, test equipment, and functional
descriptions of the assemblies. A glossary of terms is also provided in Appendix A.
1.2 WARRANTY
For warranty information refer to the inside front cover of this manual.
NOTE
Contractual agreements may supersede standard warranty. Refer
to contract agreement for additional warranty information.
1.3 GENERAL EQUIPMENT DESCRIPTION
1.3.1 MX-9325 Transceiver
Figure 1-1 shows the MX-9325 Transceiver.
The MX-9325 Transceiver is a rack-mounted, fully programmable unit. The MX-9325 Transceiver operates as a
double sideband AM-MSK analog data Transceiver or as a D8PSK digital-data transceiver. The MX-9325
Transceiver yields a 25-Watt power output that covers the frequency range of 118.000 to 136.975 MHz with 25
kHz spacing between channels. All programmable features and functions are controlled via asynchronous serial
port on front panel from a PC or an ASCII terminal. The MX-9325 Transceiver operates from 87 Vac to 265 Vac,
47 Hz to 63 Hz.
The MX-9325 Transceiver represents a new generation of ground-to-air VHF radio equipment to meet the
demanding needs for ATC communications. This advanced MX-9325 Transceiver is designed to operate in two
modes. As a double sideband AM-MSK analog data transceiver, the MX-9325 Transceiver supports the
requirements for a multiple-mode communications radio for ACARS utilizing an MSK modem integral to the
radio providing all modulation/demodulation and CSMA for media access control. As a D8PSK digital-data
transceiver, the MX-9325 Transceiver supports the following operational requirements:
• Mode 2 ICAO Annex 10, Volume III
• Mode 3 operation per RTCA SC-172, working group 3 MOPS
• EUROCAE working group 47 MOPS
The MX-9325 Transceiver is operated from a VHF Ground Computer (VGC) using ACARS software. For more
information on operations, refer to the VGC and ACARS Operations Manual. Locally the VGC interfaces to the
MX-9325 Transceiver Host Port. Remote operations are controlled using a VGC with an optional VHF Extender
Unit. Refer to Paragraph 1.3.2 for VHF Extender Unit description. The Extender Unit is also required for split site
configuration (MX-9325 Transceiver installed as a separate transmitter and receiver function). Remote control is
via an RS-422 electrical connection using a baud rate up to 192 k baud programmable from the VGC.
1-1
MX-9325
GENERAL INFORMATION
The MX-9325 Transceiver maintains three non-volatile storage areas called Software Banks, to hold downloaded
software data. At any time, two of the banks are considered active and contain valid copies of the MX-9325
Transceiver operating software. This enables the radio to execute the most recent downloaded version of its
software, or to switch to a previously downloaded version via instruction from the VGC. When a MX-9325
transceiver is shipped from the factory, it contains identical versions of software in all software banks, although
only two banks are regarded as containing active software versions.
Another feature of the MX-9325 Transceiver is its BIT capability. BIT self-test routine diagnoses and isolates
faults within the MX-9325 Transceiver to the assembly level. Faults are reported to the MX-9325 Transceiver
front panel fault LED. The fault code is diagnosed at a PC or ASCII terminal connected to the front panel
mounted maintenance port or from the VGC using a BIT command. This feature helps to quickly test and repair
the transceiver. Within the MX-9325 Transceiver BIT, it continuously monitors power supply output, synthesizer
lock status, receiver sensitivity and the PA temperature.
1.3.2 VHF Extender Unit (optional)
Figure 1-2 shows the VHF Extender Unit. The VHF Extender Unit is required for remote and split site
configurations.
The VHF Extender Unit is rack mounted and consists of 14 plug-in card modules and two fused power supplies to
accommodate inputs of 115 or 230 Vac. The VHF Extender Unit is designed to interface signal or multiple
Transceivers to the VGC and to an optional 4 by 4 antenna relay switch that automatically switches the VGC to a
reserved MX-9325 Transceiver during a disabling fault situation.
Using the VHF Extender Unit, the receivers channel busy and the transmitter’s receiver mute differential signal
output lines are extended to the remote site by means of a current loop interface circuit, capable of driving the
required maximum length of hard wire lines between sites. Refer to Chapter 3 for MX-9325 Transceiver
configuration. Refer to Chapter 8 for system interconnect diagrams.
The VHF Extender Unit specifications are included in Table 1-3.
1.3.2.1 VHF Extender Unit Plug-in Module Cards
The VHF Extender Unit uses three types of plug-in module cards. The type and quantity depend on the MX-9325
Transceiver system configuration. The following are the plug-in module card types and configuration when used:
• EIA-530 Modem - A high speed, short range synchronous COTS data modem card. The EIA-530 Modem
is required for each MX-9325 Transceiver to communicate in remote site configuration, quantity 14
maximum. The EIA-530 Modem is utilized to extend the Host Port EIA-serial data interface between the
local site computer or MX-9325 Transceiver and remote site MX-9325 Transceiver.
• Discrete I/O Card - A circuit card containing two (2) discrete control line level converters. The Discrete
I/O Card is required along with each EIA-530 Modem for split site MX-9325 Transceiver configuration,
quantity seven (7) maximum of discreet I/O cards with seven (7) maximum EIA-530 Modems. The
Discrete I/O Card is utilized to extend the transmit mute and receiver channel busy signals between local
and remote site MX-9325 Transceivers to support ACARS and Mode 2 operation. Each board has an
EIA-422 signal level input and output (TX/RX) which is converted to and from differential 20 mA loop
levels for transmission over the intersite lines.
• RS-232 Modem - A low speed, short-range asynchronous COTS data modem card. Required for each
optional antenna relay switch installed. One (1) antenna relay switch accommodates eight (8)
transceivers. The RS-232 Modem is utilized to extend EIA-232 Serial data between VGC and multiple
Transceivers to a 4 by 4 antenna relay switch that automatically switches the VGC to a reserved
MX-9325 Transceiver during a disabling fault situation.
1-2
MX-9325
GENERAL INFORMATION
Refer to Table 1-2 for additional VHF Extender Unit configuration information.
1.3.3 MX-9325 Transceiver Front Panel
See Figure 1-1. The MX-9325 Transceiver front panel provides serial connector for maintenance interface. Also
provided on the front panel, on/off switch, status indication LEDs, reference oscillator test connection and an
accessory connector.
1.3.4 MX-9325 Transceiver Rear Panel
Refer to Chapter 8, Figure 8-2. The MX-9325 Transceiver rear panel provides AC power connector, antenna (RF)
connection, discrete I/O port, extender port, and host (data) port.
1.3.5 VHF Extender Unit Rear Panel
Refer to Chapter 8, Figure 8-3. The VHF Extender Unit rear panel provides 14 snap type terminal block
transmission line connections, 14-dB 25 female data interface connections.
1-3
MX-9325
GENERAL INFORMATION
1-4
9325–002
Figure 1-2. VHF Extender Unit
MX-9325
GENERAL INFORMATION
1.3.6 Mounting
The MX-9325 Transceiver and VHF extender unit are designed to be rack mounted. Refer to Chapter 6 and
Chapter 8 for installation information.
1.3.7 MX-9325 MX-9325 Transceiver Configuration Information
Table 1-1 identifies the MX-9325 Transceiver configuration and part number described in this manual. Table 1-2
identifies the VHF extender unit configurations and part numbers described in this manual. Refer to Chapter 7 for
family tree. For firmware revision of this manual, refer to the title page that appears just after the warranty inside
the front cover.
Table 1-1. MX-9325 Transceiver Configurations
Product
Description Part Number
MX-9325 VHF Multimode Transceiver 12007-1000-01
1.3.8 VHF Extender Unit Configuration Information
Table 1-2 identifies the VHF extender unit configurations and part numbers described in this manual. Column one
(1) lists the part number with the last two (2) digits being the number of MX-9325 Transceivers supported. Refer
to Chapter 7 for the family tree. For firmware revision of this manual, refer to the title page that appears just after
the warranty inside the front cover.
Table 1-2. VHS Extender Unit Configurations
Part Number VHF Extender Unit
Configuration Description
12007-6000-001
Thru
12007-6000-014
12007-6000-101
Thru
12007-6000-108
12007-6000-109
Thru
12007-6000-112
12007-6000-201
Thru
12007-6000-207
12007-6000-301
Thru
12007-6000-306
Remote or Split Site 1 XCVR
Thru
Remote or Split Site 14 XCVR’s
Remote Site 1 XCVR 1 Ant. Sw.
Thru
Remote Site 8 XCVR’s 1 Ant. Sw.
Remote Site 9 XCVR’s 2 Ant. Sw.
Thru
Remote Site 12 XCVR’s 2 Ant. Sw.
Split Site 1 XCVR
Thru
Split Site 7 XCVR’s
Split Site 1 XCVR 1 Ant. Sw.
Thru
Split Site 6 XCVR’s 1 Ant. Sw.
Qty
of
EIA-530
Modem
1
thru
14
1
thru
8
9
thru
12
1
thru
7
1
thru
6
Slot
Position
in use
by
EIA-530
Modem
1
thru
14
1
thru
8
9
thru
12
1
thru
1,3,5,7,9,
11,13
1
thru
1,3,5,
7,9,11
Qty
of
I/O
Card
0
Thru
0
0
Thru
0
0
Thru
0
1
Thru
7
1
Thru
6
Slot
Position
in use
by
I/O
Card
0
Thru
0
0
Thru
0
0
Thru
0
2
Thru
2,4,6,8,
10,12,14
2
Thru
2,4,6,8,10
,12,14
Qty of
RS-232
Modem
0
Thru
0
1
Thru
1
2
Thru
2
0
Thru
0
1
Thru
1
Slot
Position
in use
by
RS-232
Modem
0
Thru
0
14
Thru
14
13,14
Thru
13,14
0
Thru
0
14
Thru
14
1.3.8.1 MX-9325 Transceiver Unit Identification
MX-9325 Transceiver identification information is located on the front panel identification tag.
1-5
MX-9325
GENERAL INFORMATION
1.3.8.2 VHF Extender Unit Identification
VHF Extender Unit Identification is located TBD.
1.4 ADDITIONAL ITEMS SHIPPED WITH UNIT
The MX-9325 Transceiver is shipped with an ancillary kit which is listed in Chapter 7, Paragraph 7.4.4.
1.5 REFERENCE DOCUMENTS
Refer to the following documents for additional information on the OEM VHF Extender Unit.
• RAD Data Communications Publication No. 601-200-04/99, ASM-20 Synchronous/Asynchronous Short
Range Modem Installation and Operation manual, April 1999.
• RAD Data communications Website, www.rad.com, September 1999.
• Electronics Industries Association, EIA-530 Standard: High Speed 25-position Interface for Data
Terminal Equipment and Data circuit-Terminating Equipment, 18 March 1987.
• Black Box Corporation, 256-kbps Line-Driver (LDM-256) Cards User Manual, August 1997.
• Black box Corporation, Racknest 2/14 User Manual, March 1997.
• Black Box Corporation, LDM-MR19.2 User Manual, April 1998.
1.6 RECOMMENDED TOOLS AND TEST EQUIPMENT
Tools and test equipment recommended for installing, troubleshooting, and repairing the MX-9325 Transceiver
are listed in Chapter 7, Paragraph 7.3.
1.7 SPECIFICATIONS
Refer to Table 1-3 for MX-9325 Transceiver specifications.
Table 1-3. MX-9325 Transceiver Specifications
Function
GENERAL
Frequency Range 118 MHz to 136.975 MHz
Frequency Tolerance
Channel Spacing 25 kHz
Tuning Time 100 ms from the receipt of the last bit of the frequency change
Receive to Transmit Turnaround 1 ms after terminating the receive function
Transmit to Receive Turnaround 1 ms after terminating the final information
EMI/EMC Approvals BZT, CE OFCOM and U.S. FCC Class B Operation
Safety Agency Approvals CSA, UL, BSI
BIT DC power supplies, PA temperature, synthesizer lock, receiver
Data Interface Data Port: RS-422 synchronous, rear panel DB-25 with RS-530
Modes AM-MSK : Per ARINC Specification 618-2
1 PPM, –20C to +55C, aging 1 ppm per year maximum
command.
sensitivity
connector definition
Maintenance Port: RS-232 asynchronous, up to 192 kbps, via front
panel DB-9 female connector
Mode 2: Per ICAO Annex 10
Mode 3: Per RTCA SC-172 WG3 MOPS
Specification
1-6
GENERAL INFORMATION
Table 1-3. MX-9325 Transceiver Specifications – Continued
MX-9325
Function
Specification
Channel Statistics SNR,RSSI, Pre-key value, message duration, cumulative receive time,
cumulative standby time.
TRANSMITTER
Output Power MSK: 25 Watts adjustable from 5 to 25 Watts via maintenance port
D8PSK: 25 Watts average
VSWR No degradation for up to 2:1; no damage from infinite VSWR
Duty Cycle 50% Continuous
Harmonic and Spurious Emissions - 80 dBc minimum for all modes
Adjacent Channel Power and Wideband Noise
MSK: -70 dBc minimum;
D8PSK: Per ICAO Annex 10
Transmitter Time-out Time 5 to 60 seconds, adjustable
Transmitter Keying Via maintenance port for installation setup and test
RF Power Rise time Less that 190 µs (two symbols)
RF Power Release Time Within 190 µs after transmitting the final information symbol
Data Rate MSK: 2400 bps
D8PSK: 31.5 kilobits per second ± 0.005%
Transmitter Pre-key 0 to 190 msec, adjustment via maintenance port 85 msec default
Transmitter Phase and Amplitude
Balance
D8PSK: 90± 3 degrees phase, and ± 1 dB amplitude maximum
Transit Delay MSK: 10 mS maximum
Frequency Response MSK: 200 Hz to 3600 Hz ± 2 dB
Differential Phase Delay MSK: 20 µS
Audio Distortion MSK: 5%
Modulation Level MSK: adjustable 30 to 95% via maintenance port
Internal Test Signals MSK: 1200 or 2400 Hz individual; random sequence of 1200 Hz and
2400 Hz; 1 kHz
D8PSK: CW carrier, continuous random data
Digital Interface, Data (J3) RS-232 or RS-422
RECEIVER
Sensitivity MSK: - 99 dBm for 10 dB SINAD, 30% AM with 1 kHz modulation
signal;
–
D8PSK: - 103 dBm for 10
uncorrected BER
IF Selectivity - 6 dB at ± 10kHz; - 80 dB at ± 25 kHz
Adjacent Channel Rejection
44 dB minimum for 10– uncorrected BER (per EUROCAE MOPS)
Spurious Radiation 80 dB minimum
Rejection of Signals in the VHF
Band
For -3 dBm interferer (Fi) removed from desired 450 ≤ (Fi) ≤ 2000
kHz, less than 3 dB SINAD degradation;
For 0 dB interferer (Fi) removed from desired Fi ≤ 2 MHz, less that
3 dB SINAD degradation
Rejection of Signals outside the
VHF Band
For signal interferer 0 dB or less within FM broadcast band, no SINAD
degradation.
In-Band Signal Rejection 70 dB minimum for interfering signals spaced greater that 100 kHz
from desired.
FM Broadcast Intermodulation For two interfering signals 0 dB or less within FM broadcast band, no
SINAD degradation.
1-7
MX-9325
GENERAL INFORMATION
Table 1-3. MX-9325 Transceiver Specifications – Continued
Function
Noise Rejection
For -157 dBm/Hz AWG noise input and -95 dBm desired, 10
Specification
–
uncorrected BER minimum
Desired Signal Dynamic Range
Symbol Rate Capture Range
Frequency Capture Range
Doppler Rate
+ 10 to – 103 dBm for 10– corrected BER
60 parts per million minimum for 10– uncorrected BER
± 965 Hz minimum for 10– uncorrected BER
±18 Hz/s minimum for 10– uncorrected BER within ± 140 Hz Doppler
shift range
Co-Channel Interference
–20 dB for 10– uncorrected BER
Conducted Spurious Emission –64 dBm maximum 50 kHz to 1215 MHz
Cross Modulation 60 dB for interferer (Fi) removed from desired 25 ≤ Fi ≤ 1000 kHz
80 dB for interferer (Fi) removed from desired Fi > 1 MHz
Transit Delay MSK: 10 ms maximum
AGC Attack Time MSK: 7.5 ms maximum
AGC Release Time MSK: 7.5 ms maximum
Squelch Disable Internal, via maintenance port
Loudspeaker External, handset via maintenance port jack
Receiver Mute internal, via maintenance port
Signal Quality Output (RSSI) Reported to GSC via ACARS message format
Maximum RF Input 5 Vrms minimum without damage
AS Power Requirements 87 to 265 Vac 47 Hz – 63 Hz
POWER
DC Power Requirements None
Input Power Consumption 250 Watts
ENVIRONMENTAL
Operating Temperature
–20C to +55C
Humidity Up to 95% Non-Condensing
Storage Temperature
–40C to + 70C
Altitude 10,000 ft
RELIABILITY/MAINTAINABILITY
Self Test BITE
MTBF >50,000 Hours
MTTR <15 Minutes
MECHANICAL
Size 5.25 H x 18.5 L x 19.0 W inches
(13.36 H x 45.72 D x 48.26 W centimeters)
Weight 35 lbs
(15.4 kg)
Table 1-4. VHF Extender Unit Specifications
Function
Specification
OEM CHASSIS ASSEMBLY
Physical Dimensions 7” H x 19” W x 10” D (17.8 cm H x 48.3 cm W x 25.4 cm D) Fits
standard 19” rack, 4 rack units high.
1-8
GENERAL INFORMATION
Table 1-4. VHF Extender Unit Specifications – Continued
MX-9325
Function
Specification
Capacity 14 slots for circuit cards, 2 slots for non-interchangeable power supply
cards
Power Supply 115 Vac ± 10%, 47 - 63 Hz
230 Vac ± 10%, 47 - 63 Hz
Temperature 0° - 50°C (32° - 122°F)
Humidity 10 to 90%, non-condensing
Certifications CE, UL
EIA-530 MODEM
Diagnostics Local Digital Loopback: Activated by a manual switch (DIG)
Remote Digital Loopback: Activated by manual switch (REM) or
RL pin 21 of the EIA-530 I/F (per V.54, Loop 2)
Local Analog Loopback: Activated by manual switch (ANA) or
LL Pin 18 of the EIA-530 I/F (per V.54, Loop 3)
Function Specification
Connectors Male Board Edge connector, 44 pin (38 contact), mates with chassis slot
connector
Power Consumption 5 watts
Temperature 0° - 50°C (32° - 122°F)
Humidity 10 to 90%, non-condensing
Maximum Altitude 8000 ft. (2438.4m)
Certifications FCC Class A
Function Specification
DISCRETE I / O CARD
Physical Dimensions 6.2” H x 1” W x 9.1” D (15.7 cm H x 2.5 cm W x 23.0 cm D)
Weight 8 oz. approx.
Transmission Line I/F Unloaded twisted pair, 19 to 26 AWG
Output Signal 20 mA loop, in a differential configuration
Digital Interface 2x RS-422 Balanced pairs, TX, 1 RX
Signal Rates 1000 pps maximum
Transmission Delay Dependent on characteristics of Intersite Transmission line
typical 50µsec
Diagnostics Receive Loop fail indication - with front panel LED and Alarm contact
closure.
Alarm Output Bi-directional Solid State relay, NO or NC strap configuration
Output On resistance = 1Ω normal
Maximum Output Current = < 250 mA
Maximum Output Voltage = 55 Vdc
Input/Output Insulation Voltage = 2500 VAC Maximum
Alarm Reset Input Contact closure (TTL compatible)
Connectors Male Board Edge Connector, 44 pin (38 contact), mates with chassis slot
connector
Power Consumption < 100 mA from Chassis supply
Temperature 0° - 50°C (32° - 122°F)
1-9
MX-9325
GENERAL INFORMATION
Table 1-4. VHF Extender Unit Specifications – Continued
Function
Specification
Humidity 10 to 90%, non-condensing
RS-232 MODEM
Alternate Source Unloaded twisted pair, 19 to 26 AWG
Physical Dimensions 20 mA loop, in a differential configuration
Weight 2x RS-422 Balanced pairs, TX, 1 RX
Transmission Line I/F 1000 pps maximum
Transmit Level Dependent on characteristics of Intersite Transmission line
typical 50µsec
Transmit Impedance Receive Loop fail indication - with front panel LED and Alarm contact
closure.
Receive Impedance 150, 300, 600Ω, or HIGH, strap selectable
Return Loss > 15 dB
Carrier Controlled by RTS or constantly ON
Modulation Conditioned differential di-phase EUROCOM Standard D1
Digital Interface V.24/RS-232D (EIA-232)
Data Rates, Sync / Async 19.2 kbps (other rates include 1.2, 2.4 3.6, 4.8, 7.2, 9.6 and 14.4 kbps)
RTS/CTS Delay 0, 8, 64 milliseconds, switch selectable
Data Word Length 8, 9, 10 11 bits
Stop Bits 1, 1.5, 2 bits
Timing Elements Receive Clock is derived from the receive signal; Transmit Clock is
derived from 3 alterative source: Internal oscillator, External from DTE,
or Loop Clock derived from the receive signal.
Diagnostics Local Digital Loopback: Activated by a manual switch (DIG)
Remote Digital Loopback: Activated by manual switch (REM) or
RL pin 21 of the RS-232 I/F (per V.54, Loop 2)
Local Analog Loopback: Activated by manual switch (ANA) or
LL Pin 18 of the RS-232 I/F (per V.54, Loop 3)
Connectors Male Board Edge Connector, 44 pin (38 contact), mates with chassis
connector
Power Consumption 3 watts
Temperature 0° - 50°C (32° - 122°F)
Humidity up to 90%, non-condensing
Certifications FCC Part 15, Subpart J Class A
NOTE
Because Harris engineers continuously strive to improve all
aspects of Harris equipment, specifications are subject to change
without notice.
1-10
MX-9325
OPERATION
CHAPTER 2
OPERATION
2.1 INTRODUCTION
This chapter contains information necessary for operation of the MX-9325 Transceiver at the intermediate
maintenance level. This information consists of operator controls and indicators, and operating instructions. A
description of the front panel controls, indicators, and connectors is provided in Paragraph 2.2. Basic operating
procedures are provided in Paragraph 2.3. Setup and programming procedures are provided in Chapter 3.
2.2 FRONT PANEL CONTROLS, INDICATORS, AND CONNECTORS
Figure 2-1 shows the controls, indicators, and connectors on the MX-9325 Transceiver front panel. Table 2-1
describes the controls, indicators, and connectors.
Figure 2-2 shows the controls and indicators on the VHF Extender Unit front panel. Table 2-2 describes the
controls and indicators.
2-1
MX-9325
OPERATION
7
1
2
8
3
4
5
9
6
FRONT VIEW
9325-003
Figure 2-1. Front Panel Controls, Indicators, and Connectors
Table 2-1. Front Panel Controls, Indicators, and Connectors
Key
(Fig 2-1)
Control/Indicator Function
1 Power ON/OFF Switch Used to power MX-9325 Transceiver on or off.
2 Maintenance Port Used for local control and setup of transceiver.
3 Frequency Reference Oscillator Test – used to measure and calibrate MX-9325 Transceiver ref-
erence oscillator.
4 Accessory connector Used to test receive and transmit audio parameters in MSK
mode.
5 Fault LED Lights when internal fault is detected.
6 Transmit LED Lights when MX-9325 Transceiver is transmitting data.
7 Receive LED Lights when MX-9325 Transceiver is receiving data.
8 AC Power LED Lights when MX-9325 Transceiver is powered on.
9 Product Identification Tag Contains MX-9325 Transceiver part number and serial number.
2-2
OPERATION
5
MX-9325
1 2
3
Figure 2-2. VHF Extender Unit
4
9325-004
9325–004
Table 2-2. VHF Extender Unit Controls, Indicators, and Connectors
Key
(Fig 2-2)
Control/Indicator Function
1 EIA-530 Modem High Speed Modem
PWR EIA-530 Modem - LED Lights Green when modem power is on.
RTS EIA-530 Modem – LED Lights Yellow when terminal (DTE) activates the
Request-to-Send line.
TD EIA-530 Modem - LED Lights Y ellow when SPACE is being transmitted. Flickers as data
is transmitted.
RD EIA-530 Modem - LED Lights Yellow when steady SP ACE is being received. Flickers as
data is received.
DCD EIA-530 Modem - LED Lights Y ellow when a valid receive signal is present.
2-3
MX-9325
OPERATION
Table 2-2. VHF Extender Unit Controls, Indicators, and Connectors – Continued
Key
(Fig 2-2)
Control/Indicator Function
TEST EIA-530 Modem - LED Lights Red when the modem is in any one of the three Loopback
modes - DIG, ANA, REM, or when the PA TT pushbutton is
depressed.
ERR EIA-530 Modem - LED Lights Yellow momentarily when P ATT switch is activated and
then goes out. If there are errors in the test pattern, the LED blinks
or remains lit.
RPF EIA-530 Modem - LED Lights when there’s a power failure in remote standalone unit.
May be reset by depressing the red RPT reset pushbutton.
DIG EIA-530 Modem - LED The Digital loopback switch causes the local modem to loop
received data and clock back to its transmitter. Data set ready will
turn off.
ANA EIA-530 Modem - Pushbutton The Analog Loopback switch causes the local modem to loop its
transmitter output back to its receiver. This Loopback may also be
activated from the DTE per V.54, Loop 3- Local Loopback, via
pin 18 on the EIA-530 D sub-connector interface.
REM EIA-530 Modem - Pushbutton
switch
The Remote Signal Loopback switch causes the remoted EIA-530
modem to loop received data and clock to its transmitter. Data set
Ready will turn off. This loopback may be also activated from the
DTE per V.54, Loop 2 – Remote Loopback, via pin 21 on the
EIA-530 D sub-connector interface.
PATT EIA-530 Modem - Pushbutton
switch
The pattern switch causes the EIA-530 modem to send and receive
a 511-bit test pattern. If errors are encountered by the receiver, the
ERR LED will light or flicker. The RD and CTS will turn off.
NOTE
The modem must be set to constant carrier, or if set to switched
carrier the RTS signal must be asserted (high) for the test to work.
RPF EIA-530 Modem - RESET
When pushed will reset the ERR LED.
Pushbutton switch
2 Discrete I/O Card
PWR Discrete I/O Card - LED Lights Green when Discrete I/O Card power is on.
TX Discrete I/O Card - LED Lights Y ellow when transmit discrete line signal is asserted.
RX Discrete I/O Card - LED Lights Yellow when receive discrete line signal is asserted.
ALM Discrete I/O Card - LED Lights Red when circuit does not receive a valid signal for > 10 ms
RESET Discrete I/O Card - Pushbutton
When pushed, will reset the ALM LED.
switch
3 RS-232 Modem Low Speed Modem
RTS RS-232 Modem - LED Lights Green when RS-232 power is on.
PWR RS-232 Modem - LED Lights Yellow when terminal (DTE) activates the
Request-to-Send line.
TD RS-232 Modem - LED Lights Yellow when SPACE is being transmitted. Flickers as data
is transmitted.
RD RS-232 Modem - LED Lights Yellow when SPACE is being received. Flickers as data is
received.
DCD RS-232 Modem - LED Lights Yellow when a valid receive signal is present.
2-4
OPERATION
Table 2-2. VHF Extender Unit Controls, Indicators, and Connectors – Continued
MX-9325
Key
(Fig 2-2)
Control/Indicator Function
TEST RS-232 Modem- LED Lights Red when the modem is in any one of the three Loopbac k
modes DIG, ANA, or REM.
RPF RS-232 Modem - LED Lights Red and indicates power failure in remote standalone units.
May be reset by depressing the red RPT reset pushbutton.
DIG RS-232 Modem Pushbutton
Switch
Digital Loopback Switch. When pushed, causes the local modem
to loop received data and clock back to its transmitter. Data set
ready will go low .
ANA RS-232 Modem - Pushbutton
Switch
Analog loopback switch, when pushed will cause the local modem
to loop its transmitter output back to its receiver. This loopback
may also be activated from the DTE per V.54, Loop 3- Local
Loopback, via pin 18 on the RS-232 D sub-connector interface.
REM RS-232 Modem - Pushbutton
Switch
Remote Digital Loopback Switch, when pushed will cause the
remote RS-232 modem to loop received data and clock to its
transmitter. Data Set Ready will go low. This loopback is also
activated from the DTE per V.54, Loop 2 – Remote Loopback, via
pin 21 on the RS-232 D sub-connector interface.
RPF RS-232 Modem - RESET
When pushed, will reset the RPF LED.
Pushbutton Switch.
4 Power Supply 115 Vac Power Supply
5 Power Supply 230 Vac Power Supply
2.3 BASIC OPERATION
Before operating, the MX-9325 transceiver and VHF Extender Unit must be installed per Chapter 8 and
configured per Chapter 3. The following paragraphs provide basic operating procedures of the MX-9325
Transceiver and VHF Extender Unit.
2.3.1 Initial Settings and Power Up
Initial settings and power up consists of powering up the transmitter and running BIT. Table 2-3 provides the
initial settings and power up procedure.
NOTE
The <enter> following each command means that an ASCII CR
(carriage return) is sent to the transmitter microcontroller which
causes the command to be executed.
2-5
MX-9325
OPERATION
Table 2-3. Initial Settings and Power Up Procedure
Step
1 Transmitter rear panel
J104 Antenna Connector
2 POWER switch on the PC
Control Action Observe
Connect Antenna or a 50-Ohm/100 W
RF Attenuator.
Place switch in the ON position. The PC boots or terminal
or terminal.
3 If using a PC, run the desired terminal
emulation program. Refer to Chapter 3
Paragraph 3.2.1.
4 Ensure that the terminal or terminal
emulation program communication
parameters are correctly configured,
as described in Chapter 3, Paragraph
3.2.1.
5 POWER switch on the
Place switch in the ON position. The front panel AC power
transmitter.
powers on.
Refer to the PC or terminal
operation instructions for
more information.
The PC runs the terminal
emulation program.
Refer to software operation
instructions for more
information.
Refer to software operation
instructions for more
information.
indicator LED lights and the
PC or terminal displays the
initial power up screen. See
Figure 2-1.
If the PC or terminal does not
display the initial power up
screen, refer to Chapter 5,
Paragraph 5.2.3.
6 PC or terminal keyboard Type bit v <enter>. The transmitter executes all
BIT tests, then displays the
results on the PC or terminal.
If a BIT fault is detected, refer
to Chapter 5 Paragraph 5.2.2.
2.3.2 MX-9325 Transceiver Operation
The MX-9325 Transceiver is operated by means of a VGC. The transceiver’s rear panel mounted host port
provides the interface. The communications protocol is the LAPB, variant of the HDLC protocol. The VGC is
linked to the MX-9325 Transceiver rear panel HOST port for local operation or to the rear panel EXTENDER
port for remote or split site (two transceivers used as separate receiver and transmitter) operation via a VHF
extender unit. All operations are performed from the VGC using ACARS, Mode 2 and management software
packages. Refer to the VGC and software operations manual for operating information.
2-6
MX-9325
PROGRAMMING/SETUP
CHAPTER 3
PROGRAMMING/SETUP
3.1 INTRODUCTION
This chapter provides information required to setup and configure the MX-9325 Transceiver.
The MX-9325 Transceiver should be powered up and pass BIT fault isolation before setup or configuration
procedures are performed. Refer to Chapter 2.
3.2 SETUP
The following provides instructions on configuration and setup of the MX-9325 Transceiver. These are generally
performed once during installation.
Setup and configuration maintenance commands are performed locally using a PC or ASCII terminal attached to
the MX-9325 Transceiver front panel mounted maintenance port.
WARNING
Voltages hazardous to human life are present if Maintenance
commands are not performed properly. Failure to preform
Maintenance commands properly can cause Injury or death to
personnel.
CAUTION
Maintenance commands are intended for maintenance personnel
only. Failure to perform maintenance commands properly could
cause equipment damage.
The following paragraphs describe access levels, setup and configuration commands performed locally from
the MX-9325 Transceiver maintenance port.
3.2.1 Terminal Emulation Software Configuration
The PC running terminal emulation software or the terminal that is connected to the transmitter (rear panel J1
MAINTENANCE connector) must be configured as follows:
• 19,200 baud rate
• 8 data bits
• 1 start bit
• 1 stop bit
• No parity
Refer to the operation documentation supplied with the terminal or terminal emulation software for more
information.
3-1
MX-9325
PROGRAMMING/SETUP
NOTE
Ensure that the correct Comm. Port (i.e. Comm. 1) on the PC is
selected to correspond with the connection to the MX-9325
Transceiver J1 connector.
3.2.2 Access Levels
The MX-9325 Transceiver can be accessed at the following levels:
• Monitor Level
• Maintenance Level
• Off-line Level
In Monitor level, the maintenance port user can view various radio operational and configuration parameters.
In Maintenance level, the maintenance port user can modify various operational and configuration parameters. All
host computers connected through the host port are prohibited from changing any operational and configuration
parameters until the maintenance port returns to monitor access. The host port will continue the ability to transmit
and receive data in the access level.
In Off–line level, the maintenance port user has the same restrictions as when the user has maintenance level
access. In addition, the radio cannot accept data from the host for transmission, and cannot forward to the host
port any data that is received off-the-air.
3.2.3 Changing Access Levels
The following paragraphs describe how to change the MX-9325 Transceiver access levels.
3.2.3.1 Monitor Level
To place the MX-9325 Transceiver into Monitor Level, type the following command on the PC/Terminal:
PWD <enter>
3.2.3.2 Maintenance Level
To place the MX-9325 Transceiver into Maintenance Level, type the following command on the PC/Terminal:
PWD Maintenance <enter>
3.2.3.3 Off-line Level
To place the MX-9325 Transceiver into Offline Level, type the following command on the PC/Terminal:
PWD No RF <enter>
3.2.4 Configuration Index
Table 3-1 lists the configuration index for the MX-9325 Transceiver. Column 1 contains the command as would
be typed on the PC/Terminal. Column 2 contains the brief descriptions of the command. Columns 3, 4 and 5
contain the access level the command can be performed at. Column 6 contains a reference to the paragraph that
describes the command in detail.
3-2
Table 3-1. MX-9325 Transceiver Configuration Index
MX-9325
PROGRAMMING/SETUP
Command
Operation Procedure Monitor Maintenance
BIT Display BIT results.
FRQ Display/Modify the current radio operating
Offline
frequency.
HIS Display a history of PBIT and CBIT faults
that have occurred since the last time the
historical BIT status word was cleared.
HWV Display the revision of each assembly in the
MX-9325 Transceiver.
PSU Display radio power supply voltages. 3.2.4.5
PWD Change current access level.
PWR Display/Modify the current transmitter
output power level.
STA Display the radio operational status.
SWR Display the Voltage Standing Wave Ratio
measured during the last transmission.
TMP Display the power amplifier and power sup-
ply heatsink temperatures.
VER Display the version identifiers of the active
and back-up software images currently
resident in the radio.
FPW Display the forward power level of the last
n n n
transmission.
DBT Display the detailed BIT results for each
assembly in the radio.
KEY Display/Modify the current transmitter key
state.
MDL Display/Modify the modulation level set
point.
RPW Display the reverse power level of the last
transmission.
TCO Display/Modify the TCXO adjustment
value.
TIM Display/Modify transmitter continuous key
time-out interval.
SYC Display/Modify radio system
configuration.
MOD Display/Modify current operating mode.
TTO Generate a test tone.
MPS Display/Modify the local maintenance port
baud rate and parity settings.
DPS Display/Modify the host data port baud rate
setting.
Para-
graph
3.2.4.1
3.2.4.2
3.2.4.3
3.2.4.4
3.2.4.6
3.2.4.7
3.2.4.8
3.2.4.9
3.2.4.10
3.2.4.11
3.2.4.12
3.2.4.13
3.2.4.14
3.2.4.15
3.2.4.16
3.2.4.17
3.2.4.18
3.2.4.19
3.2.4.20
3.2.4.21
3.2.4.22
3.2.4.23
3-3
MX-9325
PROGRAMMING/SETUP
Table 3-1. MX-9325 Transceiver Configuration Index – Continued
Command
RST Reset the radio.
CLF Clear the BIT fault word and detailed BIT
Operation Procedure Monitor Maintenance Off-line
fault words for all assemblies.
CLH Clear the historical BIT status word.
SEN Run the receiver sensitivity test.
ACC Display/Modify the Mode 2 maximum
number of channel access attempts
parameter value.
ADL Display/Modify Mode 2 link level address.
PER Display/Modify the Mode 2 persistence
numerator parameter value.
TM1 Display/Modify the Mode 2 inter-access
delay timer parameter value.
TM2 Display/Modify the Mode 2 channel busy
timer time-out parameter.
CBT Display/Modify the ACARS channel busy
time-out parameter value.
UPF Display/Modify uplink filtering enable/
disable state
.
DNF Display/Modify downlink filtering enable/
disable state.
RSF Display/Modify RSSI filtering enable/
disable state.
RFT Display/Modify RSSI filtering threshold
value.
ACS Display ACARS or Mode 2 statistics,
depending on current mode.
CBF Display/Modify Category B mode filter
character.
SER Display/Modify the radio serial number.
LPB Display/Modify the LAP-B parameters. 3.2.4.41
OVN Display the number of overruns.
OVZ Display the number of overruns and reset
the number to zero.
PRG Purge the messages and display the
number that were purged.
ELP Display/Modify the print software error
log enabled/disabled flag.
ERR Display the software error log.
HELP Display the commands available at the
current access level.
TVLS Display the Tx VCO lock state.
Para-
graph
3.2.4.24
3.2.4.25
3.2.4.26
3.2.4.27
3.2.4.28
3.2.4.29
3.2.4.30
3.2.4.31
3.2.4.32
3.2.4.33
3.2.4.34
3.2.4.35
3.2.4.36
3.2.4.37
3.2.4.38
3.2.4.39
3.2.4.40
3.2.4.42
3.2.4.43
3.2.4.44
3.2.4.45
3.2.4.46
3.2.4.47
3.2.4.48
3-4
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