T-49C-CA Operational Manual Rev D

T-49C-CA Operational Manual Rev D
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T-49C/CA MOD 2
Operational and Maintenance Manual
P/N: 90008048-2
Software Revision 7.10 and Greater
20 October 2003
REVISION
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Tel-Instrument Electronics Corp
728 Garden Street
Carlstadt, NJ 07072
(201) 933-1600
www.telinstrument.com
Leading the AVIONICS TEST industry into the 21st Century!
T-49C MOD 2 90008048-2
NOTICE:
The information contained in this manual is subject to change without notice.
Tel-Instrument Electronics Corp. makes no warranty of any kind to this material,
nor shall be liable including but not limited to, for errors contained herein or for
incidental or consequential damages in connection with the furnishings,
performance, or use of this material.
PART NUMBER
VOLUMES INCLUDED
CHAPTERS INCLUDED
90008048-1
90008048-2
VOLUME 1
VOLUMES 1 & 2
CHAPTERS I & II
CHAPTERS I - VI
Chapter I – Introduction
Chapter II – Preparation for Use and Operation
Chapter III – Theory of Operation
Chapter IV – General Maintenance and Servicing Procedures
Chapter V – Schematics
Chapter VI – Illustrated Parts Catalog
COPYRIGHT NOTICE
© 2003 Tel-Instrument Electronics Corp
Reproduction of this publication or any portion thereof by any means without the
express written permission of Tel-Instrument Electronics Corp. is prohibited. For
further information, contact the Customer Support Manager, 728 Garden Street,
Carlstadt, NJ 07072. (201) 933-1600
T-49C MOD 2 90008048-2
VOLUME 1
OPERATIONAL PROCEDURES
Rev D
T-49C 90 008 048-2
T-49C/CA MOD 2 TABLE OF CHANGES
Date
REV
5-28-02
A
01-12-03
B
08-28-03
C
10-20-03
D
ECO
1797
Page
Description
Initial Release
Complete overhaul of Manual to
include but not limited too: Drawings,
Parts list, Calibration procedures, and
improved Graphics.
2-12
Added Diversity Testing
4-21
Updated Calibration Procedure
Appendix B, B-3 Updated Calibration Procedure
Removed Page Borders
Chapter 4
Updated Calibration Procedures
i
Rev D
T-49C 90 008 048-2
Table of Contents
Chapter
I
Page
Table of Changes………………………………………………………………
i
List of Illustrations…………………………………………………….………
vi
List of Tables……………………………………………………….…………
vi
Introduction
Section A- General Information
1.1
Scope of Manual…
1-1
1.2
Purpose and Function of Equipment…
1-2
1.3
Regulatory Responsibilities…
1-2
1.4
Warranty…
1-2
Section B- Equipment Description
1.5
Specifications…
1-3
1.6
T-49C TCAS Test Scenarios…
1-4
1.7
Safety Considerations…
1-4
1.8
Calibration and Repair…
1-5
1.9
Abbreviations, Acronyms, and Glossary of Terms…
1-6
II Preparation for Use and Operation
Section A- General Information
2.1
General…
2-1
2.2
Unpacking…
2-1
2.3
Installation…
2-1
2.4
Accessories…
2-1
Section B- Operating Controls, Indicators, and Connectors
2.5
General…
2-3
2.6
Controls, Indicators, and Connectors…
2-3
ii
Rev D
T-49C 90 008 048-2
Table of Contents (continued)
Chapter
Page
Section C- Operating Instructions
2.7
General…
2-5
2.8
Battery Operation…
2-5
2.8.1
2.8.2
Low Battery Warning…
220 VAC Operation…
2-6
2-6
2.9 STORE/REPEAT Switch…
2-7
2.10
2-8
T-49C Supplied Antennas…
2.10.1
2.10.2
2.10.3
2.10.4
2.10.5
2.11
2.12
Omni-Directional Antenna…
Directional Antenna…
Antenna Coupler (TAP-135)…
Diversity Testing…
Direct Connect Coupler (TAP-141)…
2-8
2-9
2-10
2-12
2-13
Initial Start-up Procedure…
2-14
Transponder Test Sequence…
2.12.1
2.12.2
2.12.3
2.12.4
2.13
2.13.1
2.14
2.14.1
2.14.2
2.14.3
2.14.4
2.15
2.15.1
2.15.2
2.15.3
2-15
Mode 3A/C Automatic Sequence of Transponder Tests…
Mode 3A/C Manual Sequence of Transponder Tests…
Mode S Automatic Sequence of Transponder Tests…
Mode S Manual Sequence of Tests…
2-16
2-17
2-19
2-20
Pulse Width, Spacing, and Data Pulse Measurements…
2-26
PW, Spacing, and Data Pulse Example…
2-27
TCAS Test Scenarios…
2-28
Typical TCAS Concepts…
TCAS Intruder Types and Scenarios…
TCAS Testing Cautions…
TCAS Test Sequence…
2-28
2-30
2-30
2-30
RS-232 Download Procedures…
Setting Up You PC…
Downloading the Data…
Loading the Data to an Excel File…
2-36
2-37
2-38
2-39
III Principles of Operation
3.1
General…
3-1
3.2
Test Modes…
3-1
iii
Rev D
T-49C 90 008 048-2
Table of Contents (continued)
Chapter
Page
3.2.1
3.2.2
3.3
ATCRBS (Mode A/C) and Mode S Transponder Testing…
TCAS Testing…
Theory of Operation…
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
RF Transmitter…
RF Receiver…
Power, Frequency, and Sensitivity Measurements…
Diversity Measurements…
Microprocessor…
Battery Charger and Power Supply…
3-1
3-1
3-2
3-2
3-3
3-3
3-4
3-4
3-5
IV Test, Calibration and Maintenance
4.1
General…
4-1
Section A - Routine Maintenance
4.2
General…
4.2.1
4.2.2
4.2.3
4-2
Cleaning Procedure…
Inspection of all connectors, cables, and Test Set assembly…
Battery Check and Charging…
4-2
4-2
4-3
Section B- Test Set Verification and Acceptance Checks
4.3
General…
4.3.1
4.3.2
4.3.3
4.3.4
4.3.5
4.3.6
4.3.7
4.3.8
4.3.9
4-4
Test Equipment Required…
Display Operation…
Transmitter Frequency Test…
4-4
4-4
4-5
4.3.3.1
4.3.3.2
Direct Method…
Indirect Method…
4-5
4-5
Receiver Local Oscillator Test…
Mode S Pulse Modulated Signal Test…
Omni-Directional Antenna Transponder Test…
TAP-135 Antenna Coupler Test…
TAP-141 Direct Connect Antenna…
TCAS Testing…
4-6
4-6
4-7
4-8
4-9
4-11
Section C- Annual Calibration and Alignment Tests
4.4
General…
4-12
4.5
Test Equipment Required…
4-12
iv
Rev D
T-49C 90 008 048-2
Table of Contents (continued)
Chapter
Page
4.6
Disassembly…
4-12
4.7
Digital Board Adjustment Procedures…
4-13
4.7.1
Frequency Voltage Settings…
4-13
4.7.2
4.7.3
ATCRBS/C Interrogation Test…
Mode S Interrogation Test…
4-14
4-15
4.8
RF-PCB Procedure…
4.8.1
4.8.2
4.8.3
4.8.4
4.8.5
4.8.6
Voltage Settings…
Frequency Settings…
Dynamic Range and RF Output Power Level Setting…
1030 MHz Receiver Sensitivity Test…
1090 MHz Receiver Sensitivity Test…
RF Power and Frequency Measurement/Calibration Setting…
4-17
4-17
4-17
4-18
4-20
4-21
4-21
4.9
TAP-135 Calibration
4-22
4.10
Battery Replacement…
4-25
V Schematics
5-1
TAP-135 & TAP-141…
T-49C Internal Interconnect Diagram (Front Panel)…
RF PCB, 80 079 003…
Digital PCB, 80 065 003…
Digital Range PCB, 80 087 003…
5-2
5-3
5-4
5-11
5-16
VI
6-1
Illustrated Parts Breakdown
RF Box Assembly…
Cable Assembly, Digital Range to Digital…
Cable Assembly, Digital Range to RF…
Cable Assembly, LCD to Digital…
Cable Assembly, RF/ANT FP…
PCB Digital Range…
PCB Assembly, Inverter…
PCB Assembly, Coupler…
PCB Assembly, Direct Connect…
PCB Assembly, TAP-135…
PCB Digital…
RF PCB Assembly…
TAP-135 Sub Assembly…
TAP-141-Direct Connect (Optional)…
Directional Antenna…
Front Panel Assembly…
6-2
6-3
6-4
6-5
6-6
6-7
6-9
6-10
6-11
6-12
6-13
6-18
6-25
6-27
6-29
6-30
v
Rev D
T-49C 90 008 048-2
APPENDIX
A
B
C
D
T-49C MOD 2 Test Set Verification Tests, Calibration Report…
T-49C MOD 2 Annual Calibration and Alignment Tests Calibration Report…
dBm to Watts Conversion Chart…
T-49C Test Modes…
A-1
B-1
C-1
D-1
List of Illustrations (Figures)
Figure
Title
Page
1-1
T-49C/CA MOD 2 TCAS/Transponder Ramp Test Set…
1-1
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
2-10
2-11
T-49C Accessories…
Test Set Controls, Indicators, and Connectors
Fuse Cartridge…
Directional Antenna…
TAP-135 Coupler…
TAP-135 Antenna Placement…
TAP-141 Connection Criteria…
Transponder Sequence of Tests…
Framing and Data Pulses…
Caution, Warning, and Collision Areas…
Typical TCAS Display…
2-2
2-4
2-6
2-9
2-10
2-11
2-12
2-14
2-26
2-27
2-28
3-1
3-2
T-49C/CA Configuration Chart…
T-49C/CA Simplified Block Diagram…
3-6
3-7
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
T-49C Antenna Test Setup…
Interrogation Waveforms…
Linear Output Response…
Receiver Sensitivity Set-Up…
TAP-135 Calibration Setup…
TAP-135 Network Analyzer Display…
TAP-135 Adjustment Examples…
Test Point Locations
4-10
4-16
4-19
4-20
4-22
4-23
4-24
4-26
List of Tables
Table
2-1
2-2
2-3
2-4
Title
T-49C/CA MOD 2 Test Set Accessories…
Controls, Indicators and Connectors…
Pulse Width and Spacing Criteria…
TCAS Intruder Scenarios…
Page
2-2
2-3
2-27
2-30
vi
Rev D
T-49C 90 008 048-2
CHAPTER I
INTRODUCTION
SECTION A
1.1
Scope of Manual
This manual is intended to familiarize the operator with the operating procedures necessary to
utilize the T-49C/CA MOD 2 Test Set. If you purchased the option of Maintenance and Servicing
Instructions, these procedures are included as Chapters IV, V, and VI.
T-49C
TCAS/MODES/ATCRBS
TRANSPONDER RAMP
TEST SET
ANTENNA
TEST
USE TAP-135
OR TAP-141
WITH THIS UNIT
TCAS INTRUDER
SCENARIO
-
TYPE
ATCRBS
ALTITUDE
LIGHTS
OFFSET
TEL-INSTRUMENT ELEC. CORP
MODE S
+
14 NMI
INTERROGATE
TCAS
0 NMI
+200
-200
TCAS/HI
ATCRBS/MODE S
XPDR TEST
TYPE
WATTS
PART NO.
SERIAL NO.
INPUT 115/230 VAC 50-400HZ
CAGE CODE 92606 USA
MOD 1 2 3
4
5
6
OFF
+4000
-4000
50-400 HZ, SINGLE PHASE
120/220 VAC, 25 WATTS
120 VAC- 0.25 FTT, 220 VAC-0.125 FTT
XPDR/TCAS/LO
0
ACCESSORIES
REPEAT
+3500
OFF
120
-3500
STORE/
REPEAT
Figure 1-1
T-49C/CA MOD 2, TCAS/Transponder Ramp Test Set
1-1
Rev D
1.2
T-49C 90 008 048-2
Purpose and Function of the Equipment
The T-49C/CA MOD 2 Test Set (T/S) tests airborne ATCRBS MODE A & C and MODE S
transponders and TCAS I/II systems. It is a self contained and battery operated unit that requires
no direct hardware connection to the equipment under test. The Test Set receives and radiates
signals to the Unit Under Test (UUT) from an antenna supplied with the T/S. For MODE S and
ATCRBS transponder tests, an antenna coupler unit is provided to measure transponder
transmitter power, receiver frequency, receiver sensitivity, and diversity operation.
1.3
Regulatory Responsibilities
The Federal Aviation Administration (FAA), requires that transponders operated
Aviation Regulation (FAR) Part 91.215(a), 121.345(c), or 135.143(c) be tested
every 24 calendar months in accordance with FAR Part 43-Appendix F. The
Electronics Corp. T-49C/CA Test Sets perform all of the tests as required by
Appendix F, paragraphs (a) through (j).
1.4
under Federal
and inspected
Tel-Instrument
FAR Part 43-
Warranty
The Tel-Instrument Electronics Corporation warrants that each product it manufactures is free
from defective material and workmanship for a period of two (2) years subject to the following
terms and conditions. Tel-Instrument Electronics Corporation will remedy any such warranted
defect subject to the following:
This warranty requires the unit to be delivered by the owner to Tel-Instrument intact for
examination, with all transportation charges prepaid to the factory, within two (2) years from the
date of sale to original purchaser. Tel-Instrument will solely determine when such defect exists.
This warranty does not extend to any of Tel products which have been subject to misuse, neglect,
accident, improper installation, or used in violation of operating instructions. This warranty does
not extend to units which have been repaired, calibrated, or altered in any way by a facility that is
not approved, in writing, by Tel-Instrument Electronics Corp. to perform such work. This warranty
does not apply to any product where the seals or serial number thereof has been removed,
defaced or changed, nor to accessories not of our own manufacture.
Repair parts will be made available for a minimum period of five (5) years after the manufacture
of this equipment has been discontinued.
This warranty is in lieu of all other warranties expressed or implied and all such other warranties
are hereby expressly excluded. No representative or person is authorized to assume for us any
other liability or warranty in connection with the sale of Tel’s products.
This warranty does not cover or include batteries (batteries have a separate 90 day warranty).
Additional information with regard to the applications and maintenance of this equipment will be
available from time to time.
1-2
Rev D
T-49C 90 008 048-2
SECTION B
EQUIPMENT DESCRIPTION
1.5
Specifications 1
Transmitter
Frequencies
1030 MHz and 1090 MHz ± 0.1 MHz
Output power, HIGH
LO
+10 dBm ± 1 dBm
-10 dBm ± 1 dBm
Pulse amplitude on/off ratio
greater than 35 dB
Differential Phase Shift Keying (DPSK) accuracy
± 22 degrees
DPSK amplitude modulation
less than 10%
Receiver
Frequency Range
1030 ± 3MHz and 1090 ± 3 MHz
Sensitivity
< -25 dBm
Transponder Measurements Performed (Measured utilizing the TAP-141)
Receiver Sensitivity
Range -65 to -82 dBm, accuracy ± 2 dB
Radiated Power
40 to 60 dBm ± 2 dB (10 to 1000 watts)
Frequency
1087 to 1090 MHz ± 300 KHz
Reply Efficiency
0 to 99 ± 5%
Physical Properties
Packaging
MIL-PRF-28800F, Style C
Operating Temperature
-22 to +122 degrees F (-30 to +50 degrees C)
Size
14.5 x 9.4 x 6.5 inches
Weight
19.0 lbs. W/ line cord, antenna coupler, omni
and directional antennas
Battery Life
8 hours Min. at 50% duty cycle
Supplied Antennas
Directional Dipole, Omni-Directional, TAP-135
Antenna Coupler (CA contains 2)
TAP-141 Direct Connect Coupler (Optional)
1
Tel Instrument Electronics Corp. reserves the right to modify and change specifications without notice.
1-3
Rev D
1.6
1.7
T-49C 90 008 048-2
T-49C TCAS Test Scenarios
Selectable
Scenarios
Intruder
Speed
Intruder
Range
Altitude
Separation
Altitude Offset
+3500/-3500
300 kts.
14 to 0 nmi.
3500 ft.
Altitude offset will decrease as
distance decreases or ViceVersa.
0
+4000/-4000
+200/-200
300 kts.
300 kts.
300 kts.
14 to 0 nmi.
14 to 0 nmi.
14 to 0 nmi.
0
4000 ft.
200 ft.
Constant
Constant
Constant
Safety Considerations
The following are general safety precautions that are not related to a particular test or procedure.
These are recommended procedures that all personnel must apply during many phases of
operation and maintenance. It is assumed that the operator has general knowledge of electrical
theory and the dangers associated with it.
1.
When performing any of the tests thoroughly read and understand all procedures
before actually performing them.
2.
The various front panel connectors, switches, and controls specified can be
located by referring to Figure 2-1 on page 2-2.
3.
Take the time to learn the proper operation and function of the Test Set as
outlined in Chapters 1, 2, and 3. Through knowledge of the Test Set and its
capabilities greatly improves the time it takes to complete the tests.
4.
Pay particular attention to NOTES and WARNINGS that may accompany some
test procedures.
WARNINGS
Alerts the operator to potential dangers associated with a particular test.
Thoroughly understand the warning before proceeding in order to prevent a
potentially dangerous situation or damage to the Test Set.
NOTE
NOTES
Provides supplemental information that enhances the test procedure.
5.
Observe all standard safety procedures when working with live voltages. The
potential for electric shock exists any time the Test Set is removed from its case.
6.
DO-NOT service the unit or make adjustments alone. Always be in the presence
of another person when working with live voltages.
7.
Be familiar with general first aid procedures and CPR (Cardiopulmonary
Resuscitation). Contact your local Red Cross for more information.
8.
Ensure the test equipment and the tools you utilize are in good operational
condition and not damaged in any way.
1-4
Rev D
1.8
T-49C 90 008 048-2
Calibration and Repair
The T-49C/CA Test Set will require Calibration on an Annual Basis. This calibration requires the
opening of the Test Set, measuring Inputs and Outputs, and making adjustments when required.
This Calibration can be performed at Tel-Instrument Corp or at one of our authorized repair
facilities.
When utilizing Tel-Instrument Corp. as your calibration depot, any applicable Service Bulletins
and/or Software upgrades that were introduced since you purchased the Test Set will be installed
at no charge.2
In addition, the owner/operator will maintain the standard warranty that came with your Test Set.
See Paragraph 1.4, Warranty, for specific information and details regarding our warranty.
To schedule your Calibration and/or repair, please contact:
Tel Instrument Electronics Corp.
728 Garden Street
Carlstadt, NJ 07072
(201) 933-1600 EXT – 322
Or visit our Web Site at www.telinstrument.com.
2
Only Service Bulletins and Software revisions affecting the correct operation and/or function of the Test Set will be
considered “No Charge”. Modifications to the Test Set which enhances and or changes the performance or features will
be subject to charge. Contact your Tel representative for specific information regarding Service Bulletins and repair
services.
1-5
Rev D
1.9
T-49C 90 008 048-2
Abbreviations, Acronyms and Glossary of Terms3
A/A
A/A B
ac or AC
A/D
Address
Altitude
AM
ATCRBS
ATC
AUT
BIT
Comm
CW
D/A
dB
dBm
dc or DC
DME
DPSK
DF
ELM
FAA
FAR
FIFO
FREQ
ft.
G/A
Hz
IF
IFF
KHz
kts.
LCD
LED
MODE S
ATCRBS/MODE S All Call
MHz
nmi.
Air to Air
Air to Air Beacon
Alternating Current
Analog to Digital
The unique code to which a MODE S transponder replies. This is not to
be confused with the 4096 code used for identifying ATCRBS
transponders. The address of a MODE S transponder is not alterable by
the pilot or crew.
The pressure altitude of the aircraft as transmitted by an ATCRBS or
MODE S transponder. This information is obtained from an external
sensor and transmitted to the transponder.
Amplitude Modulation
Air Traffic Control Radar Beacon System
Air Traffic Control
Aircraft Under Test
Built in Test
Refers to the communications and data-link capability of a MODE S
transponder. There are four (4) capabilities: No Comm, Comm A/B,
Comm A/B/C and Comm A/B/C/D. The Comm. capability is displayed
when the transponder is determined to be a MODE S.
Continuous Wave
Digital to Analog
Decibel
Decibels above 1 milliwatt
Direct Current
Distance Measuring Equipment
Differential Phase Shift Keying. The method of modulation used for the
selective MODE S uplink interrogations.
Downlink Format. The format included in a MODE S transponder reply to
an interrogation or squitter message that indicates the type of message.
Extended Length Messages
Federal Aviation Administration
Federal Aviation Regulation
First In First Out
Frequency
Feet
Ground to Air
Hertz
Intermediate Frequency
Identify Friend or Foe
Kilohertz
Knots
Liquid Crystal Display
Light Emitting Diode
A secondary radar system where transponders can be individually
interrogated or selected (the “S” in MODE S) so that in a crowded air
traffic area, the amount of interference or garble can be reduced to a
minimum.
Interrogation that causes all ATCRBS/MODE S transponders to reply.
Megahertz
Nautical mile
3
Further definitions may be found in the following reference books and documents: Helfrick, A.D. Principles of Avionics.
Leesburg: Quality Books, 2000. RTCA/DO-181B. Minimum Operational Performance Standards for Air Traffic Control
RADAR Beacon System/Mode Select (ATCRBS/Mode S) Airborne Equipment. Washington D.C.: 1999. United States.
Federal Aviation Administration. Federal Register Fed 3, 1987 FAA rules Part 91.
1-6
Rev D
ns
PAM
PDME
PMCS
PPM
PRF
PW
PWR
RA
Receiver Efficiency
Reply Codes
RF
RMS
R/T
SIF
SLS
Squitter
Surveillance Altitude
Surveillance ID
TA
TACAN
TCAS
TX
UF
VORTAC
VOR
VSWR
WOW
UUT
XPDR
XPDR UT
4096 Code
T-49C 90 008 048-2
Nanosecond
Pulse Amplitude Modulation
Precision Distance Measuring Equipment
Preventative Maintenance Checks and Services
Pulses per Minute
Pulse Repetition Frequency
Pulse Width
Power
Resolution Advisories
The Test Set’s Measurement of valid replies received. Displayed as a
Percentage.
A transmitted response, from the airborne transponder, to an
interrogation. Commercial transponders responses are designated as
either ATCRBS/A where the reply includes the pilot selected 4096 ID
code, or ATCRBS/C, where the reply includes the aircraft pressure
altitude. These same responses for military transponders are designated
as MODE 3A and MODE 3C. The associated intruder type panel
designations on the T-48 is “ATCRBS”.
Radio Frequency
Root Mean Square
Receiver Transmitter
Selective Identification Feature
Side Lobe Suppression. A pulse transmitted from an omni-directional
antenna, used as a reference level to prevent replies to interrogations
received from the secondary radar antenna side lobes.
The self-generated transmissions made by a MODE S transponder, not in
reply to an interrogation, for the use of the collision avoidance system.
An interrogation that causes only the addressed MODE S transponder to
reply.
An interrogation that causes only the addressed MODE S transponder to
reply to its “4096” code.
Traffic Advisories
Tactical Air Navigation
Traffic Alert and Collision Avoidance System
Transmitter
Uplink Format. The format in a MODE S interrogation that indicates the
type of reply expected.
VOR and TACAN (co-located)
VHF Omni-Directional Range
Voltage Standing Wave Ratio
Weight On Wheels
Unit Under Test
Transponder
Transponder Under Test
This refers to the octal number dialed into either an ATCRBS MODE A or
MODE S transponder by the pilot. This is to be distinguished from the
address of the MODE S transponder, which cannot be changed.
3
Further definitions may be found in the following reference books and documents: Helfrick, A.D. Principles of Avionics.
Leesburg: Quality Books, 2000. RTCA/DO-181B. Minimum Operational Performance Standards for Air Traffic Control
RADAR Beacon System/Mode Select (ATCRBS/Mode S) Airborne Equipment. Washington D.C.: 1999. United States.
Federal Aviation Administration. Federal Register Fed 3, 1987 FAA rules Part 91.
1-7
Rev D
T-49C MOD 2 90 008 048-2
CHAPTER II
PREPARATION FOR USE AND OPERATION
SECTION A
2.1
General
This Chapter contains all necessary information on the initial unpacking, inspection, and set-up of
the T-49C/CA MOD 2 Test Set. From this point forward, the T-49C/CA MOD 2 Test Set will be
known as the T-49C, T-49, Test Set, or T/S.
2.2
Unpacking
When receiving the T-49C for the first time, ensure that there is no damage to the shipping
container. Carefully unpack the unit and save the shipping container in a safe location for
shipping or extended storage.
Examine the unit for obvious signs of damage. Check all displays, switches, and connectors
before utilizing the Test Set.
If any damage is found, DO NOT use the Test Set until a determination of the Test Sets functions
can be assessed. Refer to the procedures outlined in Chapter 4, Section B, Test Set Verification
and Acceptance Checks. You may also contact Tel-Instrument Electronics Corp. for assistance.
The T-49C batteries were installed and fully charged when shipped from the factory.
2.3
Installation
The T-49C is ready to use from the factory. There are no installation procedures applicable.
2.4
Accessories
Check that all accessories that were purchased with the Test Set are accounted for. The T-49C
comes standard with the following (see Table 2-1 and Figure 2-1):
2-1
Rev D
T-49C MOD 2 90 008 048-2
T-49C/CA MOD 2 Test Set, P/N- 90 000 048 MOD 2
Table 2-1
#
1
2
3
4
5
6
7
9
X
X
NOMENCLATURE
Foam Insert, Case
Directional Antenna Assembly
Case, Universal
Coupler, Antenna TAP-135 (10 ft)
Cable Assembly, AC Line Cord
Direct Connect Coupler, TAP-141
TSP-1A, Omni Antenna
Cable Assembly, Directional Antenna
Operational and Maintenance Manual
Coupler, Antenna TAP-135 (50 ft)
P/N
QTY
31000007
89000028
64030034
89000145
75010025
89000147
40030011
75010036
90008048
T-49CA
1
1
1
1
1
OPTIONAL
1
1
1
OPTIONAL
T-49C Accessories
Figure 2-1
2-2
Rev D
T-49C MOD 2 90 008 048-2
SECTION B
OPERATING CONTROLS, INDICATORS, AND CONNECTORS
2.5
General
This section covers location and function of the operating controls, indicators, and connectors. All
controls, indicators, and connectors are located on the front panel of the Test Set.
2.6
Controls, Indicators, and Connectors
Table 2-2 and Figure 2-2 describes and shows locations for the T-49C Test Set controls,
indicators, and connectors.
Control, Indicator or
Connector
1
DATA DISPLAY WINDOW
2
SCENARIO Select Switch
3
TCAS INTRUDER Select
Switch
4
LIGHTS/OFF Switch
5
ANTENNA Connector
6
AC POWER Indicator
8
9
VOLTAGE CHANGE/FUSE
CARTRIDGE
AC POWER Switch
AC Power Receptacle
10
STORE/REPEAT Switch
11
ACCESS Connector
12
TCAS/HI
XPDR/TCAS LO
13
TEST SWITCH
14
INTERROGATE Switch
15
ALTITUDE OFFSET
7
FUNCTION (Table 2-2)
Alpha/Numeric Display (two lines/20 characters) provides operational
instructions, error messages, and scenario progress and test results.
When any TCAS Intruder mode selected, 4 scenarios are available:
+200/-200, +4000/-4000, 0 and +3500/-3500.
1. Utilized to select Transponder or TCAS test scenarios.
2. In ATCRBS/MODE S XPDR TEST, selects transponder tests.
3. In TCAS, MODE S or ATCRBS, selects TCAS selectable test
scenarios.
De-energizes Test Set when toggled down. Provides Backlighting for
display when toggled up.
Connector for Omni-Directional Antenna, Directional Dipole and TAP135 Antenna Coupler.
Green “LED” indicates battery charging and AC power connected.
When the battery alone is being used, the LED will not illuminate.
Contains 2- 250V ¼ amp removable fuses for 115 VAC operations.
Permits the operator to also configure for 220VAC operation.
AC ON/OFF Switch (“-” = ON, “0” = OFF).
Allows the connection of the supplied AC power cord.
Permits the operator to repeat a specific test or store data in the T/S
RAM for download to a PC. Allows access to “Calibration Mode”.
RS-232 link for download of stored data to a PC.
Selects T/S RF Power Output of +10 dBm in the HI position and –10
dBm in the LO position. FOR SENSITIVITY MEASUREMENTS,
LEAVE THE SWITCH IN THE LO POSITION. Used for TCAS
Operation.
1. Allows manual sequence of tests to run and be displayed.
2. Used in-conjunction with INTERROGATE Switch to enter AUT
(Aircraft Under Test) altitude.
3. With Test Set “OFF”, pressing the TEST Switch will turn the Test
Set “ON”.
4. In the TCAS modes, halts the Intruder range and altitude, pressing
it a second time resumes the original track.
1. Initiates Automatic Test Sequence for Transponder and TCAS
testing.
2. Serves to enter and store data on the T/S RAM.
3. Used in conjunction with TEST switch to enter Aircraft Under Test
(AUT) altitude.
4. With Test set “OFF”, pressing the INTERROGATE Switch will turn
it “ON”.
Select above (+) or below (-) the aircraft intruder scenario.
2-3
Rev D
13
T-49C MOD 2 90 008 048-2
14
15
1
2
3
4
5
T-49C
TCAS/MODES/ATCRBS
TRANSPONDER RAMP
TEST SET
ANTENNA
TEST
USE TAP-135
OR TAP-141
WITH THIS UNIT
TCAS INTRUDER
SCENARIO
-
TYPE
ATCRBS
ALTITUDE
LIGHTS
OFFSET
TEL-INSTRUMENT ELEC. CORP
MODE S
+
14 NMI
+200
INTERROGATE
ATCRBS/MODE S
XPDR TEST
-200
TCAS/HI
TYPE
WATTS
PART NO.
SERIAL NO.
INPUT 115/230 VAC 50-400HZ
CAGE CODE 92606 USA
MOD 1 2 3
4
5
6
TCAS
0 NMI
OFF
+4000
-4000
50-400 HZ, SINGLE PHASE
120/220 VAC, 25 WATTS
120 VAC- 0.25 FTT, 220 VAC-0.125 FTT
XPDR/TCAS/LO
0
ACCESSORIES
REPEAT
+3500
OFF
120
-3500
STORE/
REPEAT
12
11
10
9
8
7
6
T-49C Test Set Controls, Indicators, and Connectors
Figure 2-2
2-4
Rev D
T-49C MOD 2 90 008 048-2
SECTION C
OPERATING INSTRUCTIONS
2.7
General
The Test Set utilizes an easy to read display that provides the operator with easy to follow “On
Screen” instructions. To run a scenario, in either TCAS or ATCRBS modes, the TCAS
INTRUDER and SCENARIO select switches are set to the desired positions followed by the
momentary press of the INTERROGATE/TEST switch. A subsequent press of the
INTERROGATE/TEST switch will commence the scenario or test sequence.
2.8
Battery Operation
The T-49C Test Set is equipped with a rechargeable Ni-Cad battery capable of operating the Test
Set using a 50% duty cycle for 8 hours at 77 degrees F (25 Degrees C). This represents a full day
of typical testing on a single charge. Operating the Test Set in lower temperatures, will decrease
the overall battery life.
Due to the Ni-Cad batteries ability to maintain a constant current level, the operator will be able to
utilize the Test Set until the batteries are nearly depleted. The unit may then be plugged into a
standard 120 (220 if so configured) VAC power source to continue testing. By observing a Duty
Cycle (DC) of 50%, the Test Set batteries will begin regaining their charge while testing is in
progress.
It is strongly recommended that the batteries be charged for a short time each week regardless if
the Test Set has been utilized or not. A completely discharged battery will require approximately
16 hours to fully charge. Occasional charges of 16 hours on partially depleted batteries will have
no adverse effects.
To charge batteries, utilize the following procedures:
1. Remove the power cord from the inside cover and attach it to the AC POWER
receptacle.
2. Connect the power cord to a suitable 120 or 220 (if configured) VAC outlet. For 220
VAC operations, see paragraph 2.8.1.
3. Turn the AC POWER switch to the “ON” position (-).
4. Verify the green LED AC POWER indicator is lit signifying that the battery has
commenced charging.
WARNING
If the battery voltage has been depleted to the point the Test Set will not turn
“ON”. DO NOT attempt to Turn the Test Set “ON” until the Unit has been
charging for a minimum of 30 minutes.
2-5
Rev D
2.8.1
T-49C MOD 2 90 008 048-2
Low Battery Warning
T-49C Test Sets with Software Revision 7.00 or greater will provide the operator with
several low battery warnings to notify them to charge the battery. These warnings will
give the operator ample time to complete current tests underway or time to utilize AC
power to supplement if further tests are necessary. When utilizing the Test Set for an
extended period, the operator may receive the following display:
1st Warning
BATTERY LOW
RECHARGE BATTERY
By depressing either the INTERROGATE or TEST button, the operator may continue to
conduct tests. If extended tests continue, a second warning is displayed to notify the
operator of an imminent battery low condition. As with the first warning, the operator may
bypass this warning to complete tests in progress.
2nd Warning
2ND WARNING
RECHARGE BATTERY
The third and final warning cannot be overridden, and the Test Set will prevent further
testing until the operator charges the battery IAW Paragraph 2.8.
3rd Warning
SHUT DOWN NOW AND
RECHARGE BATTERY
In addition to the Low Battery Warnings, the T-49C Test Set also has a circuit
designed to turn the Test Set OFF after 15 min. This circuit is active in both battery
and AC Operation.
2.8.2
220 Volt Operation
The Test Set is configured from the factory for 120 VAC. To operate the Test Set using
220 VAC, follow the procedures as listed below.
WARNING
Failure to properly configure the Test Set for 220 VAC operations before use may
result in severe damage to the Test Set.
1. Remove the FUSE CARTRIDGE from the Test Set by releasing the Tab and pulling
straight the cartridge straight out.
2. Remove and store/dispose of the two fuses.
3. Pull the bottom fuse holder from the rear of the cartridge, rotate, and reinstall the
cartridge, ensuring that 220 is viewable through the front window.
2-6
Rev D
T-49C MOD 2 90 008 048-2
120
220
Configured for 120 VAC
Configured for 220 VAC
Fuse Cartridge
Figure 2-3
4. Replace the fuses with 250V 1/8A, FTT fuses (or equivalent) and reinstall the fuse
cartridge in the fuse housing.
2.9
STORE/REPEAT Switch
The STORE/REPEAT switch allows the operator several options, which enhances the testing
procedure. When conducting Transponder Tests, in the Manual mode, toggle the switch to the
“Down” position. This will REPEAT the current test a second time. Subsequent toggles of the
switch will continue to repeat the current test.
REPEAT
OFF
STORE/
REPEAT
By placing the STORE/REPEAT switch to the “UP”’ position, the Test Set will continually retest
the selected mode until the switch is returned to the “OFF” position.
NOTE
Ensure to return the STORE/REPEAT switch back to the OFF position when
testing is complete.
Test Sets having software version 6.00 and greater, also have the capability of conducting
Altimeter checks. Access the MODE C test page (see paragraph 2.12.2). Place the
STORE/REPEAT switch in the “Up” position; the Test Set will begin to conduct the MODE C Test
continually. The screen will alternate between the MODE C test page and the PW measurement
page (See paragraph 2.13 for further information).
MODE 3A
0.45 - 20.35
-
PASS
0.45
MODE 3C
10,000 FT
100% REPLY
2-7
Rev D
T-49C MOD 2 90 008 048-2
After 30 seconds has passed, the Test Set will discontinue the PW measurements and only
display the MODE C altitude. This altitude is updated at a rate of approximately once per second.
The operator will be able to observe the Mode C altitude while utilizing a Pitot Static Test Set and
Pump Up the altitude verifying correct transponder altitude information.
Altitude will update at
a rate of once per second.
MODE 3C
10,000 FT
100% REPLY
When the Altimeter checks are complete, ensure that the STORE/REPEAT switch is returned
back to the OFF position to prevent unintentional battery discharge.
2.10
T-49C Supplied Antennas
The T-49C is equipped with three (3) antennas for a variety of tests. An Omni-Directional
Antenna, Directional Antenna, and Antenna Coupler (TAP-135) are supplied as standard
equipment.
NOTE
To improve overall accuracy when making power, receiver sensitivity and
frequency measurements, utilize the TAP-135 Antenna Coupler or direct connect
to the transponder with the OPTIONAL TAP-141 Coupler. The Omni Directional
Antenna and Directional Antennas are used for a QUICK check of the system
only. Power, Frequency, and Receiver Sensitivity are not displayed.
An OPTIONAL Direct Connect Coupler (TAP-141) with an attenuated path to protect the Test Set
may be purchased separately for direct connection of a transponder receiver transmitter to the T49C. This is useful to determine and troubleshoot problems by separating the aircrafts antennas
and cables from the rest of the system.
2.10.1 Omni-Directional Antenna
The Omni-Directional Antenna, stored inside the T-49C cover, primary task is to provide a quicktest capability for ATCRBS Mode A/C and Mode S equipment. The following suggestions will
improve your overall test results when utilizing the Omni-Directional Antenna. Transponder RF
power, receiver sensitivity, and frequency measurements are not displayed.
1. Connect the antenna directly to the ANTENNA CONNECTOR located on the front
panel of the T-49C Test Set.
2. Maintain a 15-100 ft. separation from the Test Set and the aircraft under test (AUT),
and a clear unobstructed path from the antenna and the Test Set (Figure 2-4).
3. Ensure the transponder that you are testing is significantly closer to the Test Set than
another operating transponder equipped aircraft. An undesired reply may occur or
erroneous indications may result.
4. DME and transponder antennas are similar in shape and appearance. Have positive
identification of the correct antenna as to adhere to the 15-100 ft. range.
2-8
Rev D
T-49C MOD 2 90 008 048-2
5. If the aircraft you are testing is dual transponder equipped, ensure the correct
antenna and transponder is selected.
2.10.2 Directional Antenna
The Directional Antenna is a printed circuit sandwiched between two opaque Lexan sheets. It is
hinged to the T-49C Test Set case cover and primarily utilized for TCAS and Transponder tests.
As with the Omni-Directional Antenna: RF power, receiver sensitivity, and frequency
measurements are not measured when using the Directional Antenna. Use the TAP-135 or TAP141 Direct Connect Coupler to conduct power, frequency, and sensitivity measurements.
NOTE
When utilizing the Directional Antenna, remove all accessories from the cover.
The cover is designed to act as an antenna reflector. Results with items left in the
cover may be inaccurate or vary.
1. Open and remove the T-49C Test Set case cover. Release the two (2) push button
holders and fold down the Directional Antenna. Remove the AC power cord, Omni
Antenna, and the TAP-135 Antenna Coupler and store them in a safe location.
2. Fold the antenna into position in the case cover and re-engage the push button
holders. Attach the antenna cable connector to the ANTENNA connector on the Test
Set.
3. Position the Test Set and antenna assembly with a 15-300 ft. unobstructed
separation from the Aircraft under test (Figure 2-4).
4.
Aim the Directional Antenna at the Aircraft Under Test (AUT) antennas and conduct
the appropriate test sequence.
Ensure there are no other
aircraft with an operating
transponder closer than the
one that is being tested
Omni
Antenna
T-49C T/S
Maintain 15 - 300 ft. distance
T-49C T/S
Directional
Antenna
Ensure there are no
obstructions between the T/S
and the UUT
Directional Antenna
Figure 2-4
2-9
Rev D
T-49C MOD 2 90 008 048-2
2.10.3 Antenna Coupler (TAP-135) (T-49CA is equipped with 2 TAP-135 Couplers)1
The Antenna Couplers provide transponder power, frequency, and sensitivity measurements. The
Antenna Couplers may only be utilized on blade type antennas. When using the Antenna
Coupler, ensure you have selected the correct antenna to test.
1. Remove the TAP-135 from the Test Set front cover, unwind the cable and connect
the cable to the ANTENNA connector on the front panel of the T-49C Test Set.
2. Pull the snap ring located on the side of the coupler and slip the coupler onto the
antenna to be tested. The TAP-135 utilizes internal springs to maintain pressure on
the antenna blade. Ensure a snug fit, flat on the aircraft fuselage.
3. Ensure that the coupler is centered over the antenna to be tested (Fig 2-6).
4. Due to the availability of numerous styles of L-Band antennas, slight adjust of the
Coupler may be necessary to receive accurate measurements. If incorrect readings
occur, re-position and ensure a snug fit on the antenna. Move the TAP-135 forward
or back and double check a firm and snug seal on the aircraft surface. The
adjustment is correct when the maximum power is displayed on the POWER RCVR,
FREQ, page.
TAP-135 Coupler
Figure 2-5
1
Measurements utilizing the TAP-135 are accurate within ± 3dB.
2-10
Rev D
T-49C MOD 2 90 008 048-2
Center the TAP-135 as close to
center as possible for the style of
antenna being tested. If inaccurate
results occur, reposition the
coupler slightly forward or back
and check for a snug flush fit until
accurate
measurements
are
displayed. Due to the many styles
of antennas available, adjustments
may be necessary.
TAP-135 Antenna Placement
Figure 2-6
2-11
Rev D
T-49C MOD 2 90 008 048-2
2.10.4 Diversity Testing Utilizing the TAP-135
Some Mode S transponders have the capability to be connected to 2 aircraft antennas. Mode S
transponders that have this capability are called “Diversity Transponders”. The 2 antennas are
typically mounted in a configuration with one on top of the aircraft and one on the bottom of the
aircraft. The diversity capability allows the transponder to receive interrogations on each of the 2
antennas and to respond on the antenna with the strongest incoming signal level.
Transponder specifications require that a diversity transponder shall have an isolation or diversity
between the 2 antennas of at least 20 dB.
The diversity test can be performed using 1 or 2 couplers. The diversity test is performed during
the automatic (press INTERROGATE) or manual (press TEST) sequence of tests.
A diversity transponder will transmit an acquisition squitter (DF11) out of the 2 antenna ports.
The squitter transmission will alternate between the 2 ports, first out of one port and then out of
the second port one second later.
To perform the diversity test using one coupler, mount the coupler on the aircraft antenna using
instructions found in paragraph 2.10.3. Connect the T-49C to the coupler cable. Select the
diversity test in either the Manual Mode of Tests or Automatic Mode of tests.
1.
The Test Set will measure the power level of the squitter being transmitted out of
the antenna connected to the coupler.
2.
One second later, the T-49C will perform a second measurement.
3.
The power measured in step #2 shall be down at least 20 dB from the first
measurement.
4.
If the power in Step #2 is less than 20 dB down from the power measured in Step
#1, the Test Set will display a ”FAIL”.
5.
Steps 1 – 4 may be continually run by select the REPEAT switch.
If the tests described in Steps #1 to #5 are performed on a non-diversity transponder, the T-49C
will show FAIL. A non-diversity transponder has only one RF connector. A non-diversity
transponder will transmit a squitter every second. As a result, the power level measured by the
T-49C in Step #1 and Step #2 will be the same and will result in a FAIL condition. This is a
normal condition.
After successful completion of the diversity test on one antenna, the coupler should be connected
to the other antenna. The diversity test should be repeated on the second antenna.
For ease of testing, the T-49CA is supplied with 2 couplers. The coupler with the long cable
should be connected to the antenna on top of the aircraft and the other coupler should be
connected to the bottom antenna. The coupler cables can be connected to the T-49C one-at-atime to perform the diversity test.
2-12
Rev D
T-49C MOD 2 90 008 048-2
2.10.5 Optional Direct Connect Coupler (TAP-141)2
The TAP-141 Direct Connect Coupler provides a means of connecting a transponder directly to
the T-49C Test Set, thus providing an accurate means of checking transponder power, frequency,
sensitivity, and diversity measurements. The TAP-141 supplies an attenuated path protecting the
Test Set from the high RF power associated with transponders.
1. Ensure power to the transponder is secured to prevent accidental transmission
without a load connected.
WARNING
The TAP-141 Coupler is labeled as to which end is connected to the Test
Set and which end to the UUT. Ensure the proper connections are made
before testing the UUT. If the proper connections are not observed, the Test
Set and/or UUT may require repair and calibration (Figure 2-7).
2. Connect the TAP-141 TEST SET connector to the ANTENNA connector located on
the front panel of the T-49C Test Set.
3. Connect the TAP-141 UUT connector directly to the transponder antenna connector.
Connect this end to the T-49C T/S
UUT
TAP-141
Test Set
Tel-Instrument
Electronics Corp.
Direct Coupler T-48/T-49
Connect this end to the Unit Under
Test (UUT).
TAP-141 Connection Criteria
Figure 2-7
4. Conduct the appropriate tests.
5. When testing is complete, ensure to de-energize the transponder under test and reconnect the antenna connection to your transponder to prevent accidental damage to
your unit.
2
Measurements utilizing the TAP-141 are accurate within ± 2 dB.
2-13
Rev D
2.11
T-49C MOD 2 90 008 048-2
Initial Start-up Procedure
When utilizing the T-49C Test Set, always begin with a fully charged battery or AC power
connected. The following displays are shown without a transponder connected.
1. With the TCAS INTRUDER type switch selected to ATCRBS/MODE S - XPDR
TEST, press the INTERROGATE button to activate the Test Set. The following
display will come into sight, briefly denoting the current software version of the T-49C
Test Set:
TEL INSTRUMENT
T-49C
REV.X.XX
2. The T-49C will then begin searching for a transponder to test. If the transponder is
not connected or powered up, the following will be displayed. The “Rotating Bar” in
the upper right of the display signifies the Test Set searching to acquire a RF signal.
XPDR TESTING ... /
NO REPLY
Rotating Bar
3. Hold the LIGHTS/OFF switch in the “UP” position to verify that the backlighting for
the display is operating. Once the operator releases the switch, the backlighting
extinguishes to conserve battery power.
4. Press “DOWN” and release the LIGHTS/OFF switch to turn power OFF to the Test
Set.
5. Ensure that the TCAS HI/LO switch is in the XPDR/TCAS/LO position when
conducting Transponder Tests.
TCAS/HI
XPDR/TCAS/LO
NOTE
Transponder Sensitivity measurements may be inaccurate if left in the HI position.
2-14
Rev D
2.12
T-49C MOD 2 90 008 048-2
Transponder Test Sequence
The T-49C is capable of testing ATCRBS Mode A, Mode C, and Mode S transponders. The tests
that are conducted will satisfy all requirements of FAR 43 Appendix F, paragraphs (a) to (j). The
operator may select an Automatic sequence of tests ending in the Power, Receiver Sensitivity,
and Frequency display or manually select the tests one at a time. Figure 2-8 lists the sequence of
tests available in the Auto and Manual sequence of tests.
The T-49C will determine upon receiving the transponder RF signal the appropriate sequence. If
the transponder is Mode S equipped, the T-49C will automatically select the Mode S menu. If the
transponder is Mode A/C capable, the T-49C will initiate the Mode 3A/C transponder tests.
TEL INSTRUMENT
T-49C
REV.6. XX
MODE S XPDR COM/ABCD
INTERROGATE TO TEST
MODE 3A/C XPDR
INTERROGATE TO TEST
MODE 3A & SLS
TEST
MODE 3A & SLS
TEST
PULSE WIDTH, DATA
PULSE TEST
PULSE WIDTH, DATA
PULSE TEST
MODE 3C
TEST
MODE 3C
TEST
MODE 3A ALL CALL
TEST
POWER, RCVR & FREQ
TEST
MODE 3C ALL CALL
TEST
XPDR TESTING . . .
NO REPLY
Pulse WidthTest is conducted
during both 3A and 3C Manual
and Auto sequence of tests.
Power measurements are not
displayed when utilizing the
Omni or Directional Antenna.
SEQUENCE COMPLETE
MODE 3A ONLY
TEST
MODE 3C ONLY
TEST
MODE S SUR IDENTITY
TEST
SQUITTER
TEST
MODE S SUR ALTITUDE
TEST
DIVERISTY
TEST
MODE S SURV SHORT
TEST
MAX TRUE AIRSPEED
TEST
MODE S COMM IDENTITY
TEST
VERTICAL STATUS BIT
TEST
MODE S COMM ALTITUDE
TEST
POWER, RCVR & FREQ
TEST
UNDESIRED REPLIES
TEST
Max True Airspeed and Vertical
Status Bit are omitted during
the AUTO Sequence of Tests.
Power measurements are not
displayed when utilizing the
Omni or Directional Antenna.
SEQUENCE COMPLETE
Transponder Sequence of Tests
Figure 2-8
2-15
Rev D
NOTE
T-49C MOD 2 90 008 048-2
Any displays illustrated were the actual results from a calibrated Transponder.
The results may be typical of tests performed, but operators must utilize the
literature provided by their transponder manufacturer or FAA guidelines when
testing their transponder. The results displayed throughout this manual are for
ILLUSTRATION PURPOSES ONLY.
2.12.1 Mode 3A/C Automatic Sequence of Transponder Tests
Upon energizing the Transponder Under Test, the T-49C will recognize the transponder as
having only Mode 3A and/or Mode C capabilities. The appropriate menu will be initiated and
shown on the T-49C display.
MODE 3A/C XPDR
INTERROGATE TO TEST
The operator may now choose to select the automatic sequence of tests or the manual sequence.
By depressing the INTERROGATE switch (as indicated on the display), the automatic sequence
will commence.
The tests will proceed in order (Figure 2-8) and conclude at the POWER, RCVR & FREQ Test
Page. The automatic mode does not display results of an individual test as long as the tests
performed “PASS”.
If a failure occurs in any one test, the T-49C will stop the automatic sequence and display the
failure.
FAIL
09% REPLY
CONTINUE: PRESS INT
By stopping the test sequence, the operator is alerted to continued and potential failures if testing
is resumed. Once the sequence is stopped due to a failure, the operator may override and
continue testing by depressing the INTERROGATE button. The T-49C will then proceed to the
next test in sequence. The operator may also choose to repeat the test by toggling the
STORE/REPEAT switch down, to initiate the failed test a second time.
When all tests are complete, with no failures, the T-49C test sequence will end with an alternating
display of measured power, receiver sensitivity, and frequency (Shown with results utilizing TAP141). The second alternating page displays power measured in watts. The Mode 3/A and 3C
Sensitivity Test is also conducted and will indicate a failure if there is a 1 dB difference between
the measurements.
POWER, RCVR & FREQ
54dB–75dB 1090.0 MHz
POWER, RCVR & FREQ
250W –75dB 1090.0MHz
When utilizing the Omni Directional Antenna or the Directional Antenna: power, frequency and
sensitivity will not be shown. Aircraft 4096 code and altitude are displayed.
1234
10,000’
NO MEASURED POWER
2-16
Rev D
T-49C MOD 2 90 008 048-2
2.12.2 Mode 3A/C Manual Sequence of Transponder Tests
To manually display each test performed by the T-49C Test Set; the operator must select the
TEST switch. The T-49C will then run each test in order (Figure 2-8) but pause and display the
results of each test. The operator must then depress the TEST button again to proceed to the
next test in sequence.
MODE 3A/C XPDR
INTERROGATE TO TEST
TEST button depressed.
MODE 3A & SLS
TESTING . . .
MODE 3A and SLS (Side Lobe Suppression) Test Initiated.
MODE 3A & SLS PASS
1234
100% REPLY
MODE 3A Test Complete. Display indicates transponders 4096
Octal Code (1234) and Receiver Efficiency (100%) as a
percentage. SLS Test PASS. Framing Pulse Widths and Spacing
are also tested. Refer to paragraph 2.13 for further information.
To check the transponder under test “IDENT” function. Press the appropriate button in the aircraft
or on the test fixture. Toggle the STORE/REPEAT switch on the T-49C. The MODE 3A test will
commence and the display will indicate “IDENT”, verifying the SPI was received.
MODE 3A
1234
IDENT
100% REPLY
“IDENT” signal received.
The TEST button must then be pressed to proceed to the next test.
MODE 3C
TESTING . . .
MODE 3C
10,000FT
100% REPLY
MODE 3C Test Initiated.
MODE 3C Test completed. Display indicates transponder
reported altitude in feet (to the nearest 100th) and receiver
efficiency as a percentage. Framing Pulse Widths and Spacing
are also tested.
TEST button depressed to proceed to the final Mode 3A/C Transponder Test.
POWER, RCVR & FREQ
TEST
Transponder power, receiver efficiency and frequency test
initiated.
2-17
Rev D
T-49C MOD 2 90 008 048-2
Test Set measures transponder RF output (54dBm) Receiver Sensitivity (-75dBm) and Frequency
(1090.0 MHz). Second alternating page displays power as watts (250W). The Mode 3/A and 3C
Sensitivity Test is also conducted and will indicate a failure if there is a 1 dB difference between
the measurements.
POWER, RCVR & FREQ
54dB–75dB 1090.0 MHz
POWER, RCVR & FREQ
250W–75dB 1090.0 MHz
During any test in the manual mode of operation, the operator may chose to repeat a particular
test by toggling the STORE/REPEAT switch. The current test displayed will commence again.
The operator may continue doing this as long as the Test Set remains “ON”. Turning the Test Set
“OFF” and then “ON” will require the operator to go through all previous tests again to reach the
desired test they want to repeat. By leaving the switch in REPEAT, the Test Set will continue
testing until toggled back to STORE.
NOTE
Always return the REPEAT switch to STORE when testing is completed.
2-18
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T-49C MOD 2 90 008 048-2
2.12.3 Mode S Automatic Sequence of Transponder Tests
Figure 2-8 lists the sequence of tests performed with a Mode S equipped transponder under test.
Paragraph 2.12.4; Mode S Manual Sequence of Transponder Tests, describes in detail each test
performed. When the INTERROGATE button is pressed, the sequence will continue as long as
normal indications are received for each test. If an abnormal result occurs, the sequence will stop
at that test and a “FAIL” message will be displayed. To override after a “FAIL” message, press the
INTERROGATE switch to continue testing with the failure.
MODE S XPDR COM/AB
INTERROGATE TO TEST
First display shown once the T-49C has determined a Mode S
equipped Transponder is being received.
When selecting the Automatic sequence of tests, the results of the tests will not be displayed until
the final test is completed. At that point, the POWER, RCVR & FREQ display will appear and
testing will cease until the INTERROGATE or TEST button is depressed again to initialize
another series of tests.
1234 NXXXXX 10,000’
54dB-82dB 1090.0MHz
H:YYYYYY O:XXXXXXX
250W FID:DLXXXXXX
The final displays of Mode S Transponder tests alternates
between two (2) pages. The first page indicates the 4096 octal
code, the decoded aircraft address, aircraft altitude and power,
sensitivity, and frequency measurements.
The second page displays the aircraft address in both
Hexadecimal and Octal, power measured in watts and the
decoded Flight Identity.
In the Automatic sequence of tests, “MAX TRUE AIRSPEED” and “VERTICAL STATUS BIT”
tests are omitted. In addition- The operator will be unable to verify the testing of the UUT “IDENT”
function
.
If the operator requires the results of either of them, the Manual sequence must be utilized.
Paragraph 2.12.4; Mode S Manual Sequence of Tests, explains each test and typical results.
2-19
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T-49C MOD 2 90 008 048-2
2.12.4 Mode S Manual Sequence of Transponder Tests
By selecting the manual sequence of Mode S tests, the operator will be able to view the results of
each test, repeat them as necessary, test the function of the transponders “IDENT” function, and
display Pulse Width, Pulse Spacing and Data Pulse measurements.
To commence the manual sequence, the operator must depress the TEST button after the Test
Set has verified a RF signal and the first test display is shown on the front panel of the T-49C.
MODE S XPDR COM/AB
INTERROGATE TO TEST
The T-49C has determined a Mode S equipped transponder is
being received. To continue testing, the operator must depress
the “TEST” button.
MODE 3A and SLS (Side Lobe Suppression) test initiated.
Framing Pulse width, data pulse, and spacing are also tested but
are not displayed unless a failure was detected.
MODE 3A & SLS
TESTING . . .
MODE 3A & SLS PASS
1234
100% REPLY
Mode 3A Test Complete. Display indicates the transponders
4096 Octal code (1234) and receiver efficiency (100%) as a
percentage. SLS Test Passed.
To test the transponder “IDENT” function, press the appropriate button in the aircraft or on the
Test Fixture. Toggle STORE/REPEAT on the T-49C. The MODE 3A test will be repeated.
“IDENT” should appear on the display indicating the receipt of the SPI pulse.
MODE 3A
1234
100%
IDENT
REPLY
“IDENT” indication displayed confirming a SPI pulse was
transmitted following the last framing pulse.
To advance to the next test, the TEST button must be depressed.
MODE 3C
TESTING . . .
MODE 3C test initiated.
MODE 3C
10,000FT 100% REPLY
The transponders reported altitude in feet (in 100 ft increments)
and receiver efficiency as a percentage.
TEST button depressed to advance to next test.
2-20
Rev D
T-49C MOD 2 90 008 048-2
MODE 3A ALL CALL
TESTING . . .
MODE 3A ALL CALL test initiated. Test Set transmits a M3A All
Call.
MODE 3A ALL CALL
YXXXXX
100% REPLY
Reported aircraft address in Hexadecimal (YXXXXX) and
receiver efficiency is displayed.
TEST button depressed to advance to next test.
MODE 3C ALL CALL
TESTING . . .
MODE 3C ALL CALL test initiated. Test Set transmits a MODE
3C-Only All Call.
MODE 3C MODE S ALL
YXXXXX
100% REPLY
Reported aircraft address in Hexadecimal (YXXXXX) and
receiver efficiency is displayed.
TEST button depressed to advance to next test.
MODE 3A ONLY
TESTING . . .
MODE 3A ONLY
PASS
Mode 3A ONLY test
ATCRBS-Only All-Call.
initiated.
Test
Set
transmits
an
A MODE S transponder will not accept an ATCRBS Only All Call.
A “PASS” displayed, indicates that the Mode S transponder did
not reply.
TEST button depressed to advance to next test.
MODE 3C ONLY
TESTING . . .
MODE 3C ONLY
PASS
MODE 3C ONLY test initiated. Test Set transmits an ATCRBS
Only All Call.
A MODE S transponder will not accept an ATCRBS Only All Call.
A “PASS” displayed, indicates that the Mode S transponder did
not reply.
2-21
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T-49C MOD 2 90 008 048-2
TEST button depressed to advance to next test.
MODE S SURV IDENTITY
TESTING . . .
MODE S Surveillance Identity test initiated. The Test Set
transmits an UF=5 Interrogation.
MODE S SURV FS: AIR
1234
100% REPLY
A DF=5 reply will display the decoded 4096 field (1234) and
Flight Status (FS). FS is utilized in the DF=4, 5, 20 and 21
formats.
NOTE
Possible FS displays are AIR (Airborne), GND (On Ground), AL/AR (Alert/Airborne),
AL/GD (Alert/Ground), AL/SP (Alert/SPI), and SPI.
TEST button depressed to advance to next test.
MODE S SURV ALTITUDE
TESTING . . .
MODE S Surveillance Altitude test initiated. The Test Set
transmits an UF=4 Interrogation.
MODE S SURV FS: AIR
10,000FT 100% REPLY
The DF=4 reply will display reported altitude (to the nearest 25 ft.
level), flight status and the receiver efficiency.
TEST button depressed to advance to next test.
MODE S SURV SHORT
TESTING . . .
MODE S Short Air to Air Surveillance test initiated. The Test Set
will transmit a short special interrogation, UF=0 format.
MODE S SRV 100%REPLY
YXXXXX GND 10,000FT
The Mode S Transponder will reply with a short special reply in
DF=0 format. Aircraft address in Hexadecimal, aircraft altitude,
and flight status is displayed.
TEST button depressed to advance to next test.
MODE S COMM IDENTITY
TESTING . . .
MODE S COMM A Identity test initiated. The Test Set transmits
a COMM A/B, ABCD transmission utilizing a UF=5/RR:18
format. This tests a transponders communication and data-link
capabilities.
2-22
Rev D
T-49C MOD 2 90 008 048-2
IDENTITY: DLXXXXXXX
1234
100% REPLY
The transponder will reply in the DF=21 format. The display will
show the Flight ID code and decoded 4096 field. Receiver
efficiency as a percentage is also displayed.
TEST button depressed to advance to next test.
MODE S COMM ALTITUDE
TESTING . . .
MODE S COMM YXXXXX
10,000FT 100% REPLY
MODE S COMM A Altitude test initiated. The Test Set transmits
a COMM A/B, ABCD transmission utilizing a UF=5/RR:18
format. This tests a transponders communication and data-link
capabilities.
The transponder will reply in the DF=20 format. Aircraft Address
in Hexadecimal, aircraft altitude, and the receiver efficiency will
be displayed.
TEST button depressed to advance to next test.
UNDESIRED REPLIES
TESTING . . .
Undesired Replies test initiated. The Test Set will make
randomly addressed interrogations. Only the correctly addressed
interrogation will be accepted.
UNDESIRED REPLIES
NO REPLIES
If the transponder replies to any of the random addresses, an
error message will be displayed. “NO REPLIES” indicates the
transponder did not reply and has passed the test.
TEST button depressed to advance to next test.
SQUITTER
TESTING . . .
The Test Set will transmit no interrogations but receives and
processes DF=11 and extended DF=17 replies. After detection
of the replies is received, two alternating pages will appear
displaying the time interval of received replies.
DF=11 Acquisition
ACQ:PASS DIV 1021 MS
ADD: AXXXXX II:0
DF=17 Extended Squitter
EXT: PASS DIV 520 MS
ADD: AXXXXX
The detection time of each DF=11 and/or DF=17 message will be displayed. If the time interval is
between 0.8-1.2 sec. - “PASS” is displayed. If the time interval falls in the 1.6-2.4 sec. range –
“DIV” (Diversity) is also displayed. The aircraft address is also shown.
2-23
Rev D
T-49C MOD 2 90 008 048-2
ACQ: NOT DETECTED
If a DF=11 or DF=17 message is not received- “NOT
DETECTED” will be displayed.
EXT:
ADD:
If only one message of either DF=11 or DF=17 is received in the
5.1 second measuring period, “FAIL” will be displayed and no
time will be shown.
FAIL
AXXXXX
TEST button depressed to advance to next test.
DIVERSITY
TESTING . . .
Diversity test initiated.
Display indicates a “PASS” when the Test Set determines
whether leakage relative to the inactive antenna is less than -20
dB. See Paragraph 2.10.4 for further information regarding
Diversity Testing.
DIVERSITY
PASS
TEST button depressed to advance to next test. The MAX TRUE AIRSPEED test is not
performed during the auto sequence of Mode S tests.
MAX TRUE AIRSPEED
TESTING . . .
Test Set initiates a UF=0 interrogation. Verifies that the
transponder airspeed code is one of seven possible RI field
codes.
MAX TRUE AIRSPEED
GT 300 & LE 600 KTS
The DF=0 reply reports the aircraft maximum cruising true
airspeed in the RI Field of the DF=0 format.
NOTE
Eight possible RI field codes are available.
1) NO Max airspeed data
2) LE 75 knots
3) GT 75 & LE 150 kts
4) GT 150 & LE 300 kts
5) GT 300 & LE 600 kts
6) GT 600 & LE 1200 kts
7) GT 1200 kts
8) Not Assigned.
GT denote “Greater Than”, LE denotes “Less than or Equal
TEST button depressed to advance to next test. The VERTICAL STATUS BIT test is not
performed during the auto sequence of Mode S tests.
2-24
Rev D
T-49C MOD 2 90 008 048-2
VERTICAL STATUS BIT
VS=1
(ON GROUND)
Test Set receives the Vertical Status as part of the UF=0 format.
A display of ONE (VS=1) is aircraft on ground. A display 0f
ZERO (VS=0) is aircraft airborne.
TEST button depressed to advance to next test.
POWER, RCVR & FREQ
TESTING . . .
POWER,RCVR & FREQ 01
TESTING
The Test Set begins transponder RF power, receiver sensitivity,
and frequency tests.
The Test Set will take the receiver sensitivity measurement four
(4) times and average the results. The number in the upper right
corner counting; 01-02-03 signifies the sensitivity test
progressing.
The final test in the manual sequence will end with an alternating display of transponder RF
power output (54dBm), receiver sensitivity (-75dBm) and transponder frequency (1090.0 MHz).
The second page displays power in watts. The Mode 3/A and 3C Sensitivity Test is also
conducted and will indicate a failure if there is a 1 dB difference between the measurements.
POWER,RCVR & FREQ
54dB-75dB 1090.0 MHz
POWER,RCVR & FREQ
250W-75dB 1090.0 MHz
2-25
Rev D
2.13
T-49C MOD 2 90 008 048-2
Pulse Width, Spacing and Data Pulse Measurements
NOTE
Pulse Width, Pulse Spacing, and Data Pulse measurements are not reliable if
the T-49CTest Set Receiver efficiency is less than 90%.
The T-49C/CA accurately measures each Framing Pulse, Pulse Width, and Pulse Spacing. Each
Data Pulse entered will also have the width and spacing measured. Both Mode S and ATCRBS
transponders are tested during the Mode 3A and Mode C portion of the MANUAL and AUTO test
sequence. If no failures are detected, no display is shown. In the event of a failure, the Test Set
will cease testing and display the failure. The Test Set will display the measured Framing Pulse
Width (F1), Spacing between F1 and F2, and Pulse width of F2 (see figure 2-9).
“DP” Signifies a Data Pulse Failure
MODE 3A
0.45 20.35
F1 Pulse Width
FAIL DP
0.45
F1 & F2 Spacing
F2 Pulse Width
A “FAIL” signifies a F1/F2 Width failure, or a Framing Pulse Spacing Failure.
F1 out of Limits
MODE 3A
0.55 20.35
-
FAIL
0.45
The operator may also chose to repeatedly measure and test the Pulse Width, Spacing and Data
Pulses by placing the STORE/REPEAT toggle in the “UP” position after completing either the
Mode 3A or Mode C test. The Test Set will then alternately test the appropriate Test (Mode 3A or
C) and the Pulse Width measurements. The display will also alternate showing the results each
time it is tested.
MODE 3A
0.45 - 20.35
-
PASS
0.45
MODE 3A
1234
100% REPLY
When conducting the PW test in the MODE C test page, after 30 seconds has passed, the Test
Set will discontinue the PW measurements. To continue to measure the PW, the operator must
cycle the STORE/REPEAT switch to begin another 30 seconds of PW measurements.
2-26
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T-49C MOD 2 90 008 048-2
2.13.1 PW, Spacing and Data Pulse Test Example
As an example, the operator of an ATCRBS transponder selects 1234 as the 4096 code. Turn the
Test Set “ON” by pressing the INTERROGATE button. The Test Set will automatically determine
an ATCRBS only transponder is transmitting. Press the TEST button to initialize the manual
sequence of tests.
MODE 3A Test Initialized. Test Set also performs Framing Pulse
Width and Data Pulse Tests. With 1234 entered, the T-49C will
measure Framing Pulses, their width, and their spacing. The
Test Set will also measure each Data Pulse in each time slot and
their separation (D4, C2, C1, B2 and A1).
MODE 3A & SLS
TESTING . . .
MODE 3A
1234
100% REPLY
Display indicating no failures.
Table 2-3 contains each parameter and their failure criteria.
PARAMETER
NORMAL
INDICATION
LIMITATIONS
Framing Pulse Width
Framing Pulse Separation
Data Pulse Width
Data Pulse Separation
.45 µs
20.3 µs
.45µs
1.45µs
± .1µs
± .1µs
± .1µs
± .1µs
Pulse Width and Spacing Criteria
Table 2-3
20.3 us
F1
F2
C1
A1
C2
A2
C4
A4
B1
D1
B2
D2
B4
SPI
D4
0.45 us
Framing and Data Pulses
Figure 2-9
2-27
Rev D
2.14
T-49C MOD 2 90 008 048-2
TCAS Test Scenarios
The T-49C Test Set is capable of testing ATCRBS and Mode S, TCAS I/II systems (Traffic Alert
and Collision Avoidance System). The operator is able to select four separate Intruder scenarios.
When properly configured, the Test Set will simulate an Intruder aircraft converging on the
position of the UUT. The operator may then observe the UUT TCAS display to ensure correct
heading and altitude displays are shown. The appropriate TA’s (Traffic Advisory) and RA’s
(Resolution Advisory) will also be heard and displayed.
2.14.1 Typical TCAS Concepts
NOTE
All illustrations shown are for demonstration purposes. Though the test
results may be typical, they are not meant to replace FAA guidelines and
manufacturer recommendations.
TCAS is a system, which provides situational awareness of the surrounding airspace of an
aircraft to the pilot and crew. A TCAS establishes a volume of airspace around the aircraft. The
size of the airspace is based on range, speed and altitude. By working in-conjunction with the
aircraft Transponder system, the TCAS can determine the relative threat of an aircraft, issue
visual and audible advisories to assist the crew in locating and/or take action to prevent a
collision.
The perimeter of the CAUTION AREA is approximately 20 to 48 seconds to the time the intruder
would enter the COLLISION AREA. Refer to Figure 2-10.
Caution, Warning, and Collision Areas for a TCAS I System
Figure 2-10
2-28
Rev D
T-49C MOD 2 90 008 048-2
A Solid Amber Circle indicates a TA (Traffic
Alert), signifying a possible collision threat to
your aircraft. Accompanied by a audible warning
of “Traffic, Traffic”
A solid white diamond signifies a proximate
traffic. Aircraft that are within 4nmi and ± 1200
feet altitude.
An open white diamond signifies other traffic
within the selected range.
Numbers represent the intruder aircrafts relative
altitude ± 100 ft levels from your aircraft.
The arrows indicate if the intruder aircraft is
ascending or descending from your relative
position.
Typical TCAS I Display
Figure 2-11
The perimeter of the WARNING AREA is approximately 15-35 seconds from entering the
COLLISION AREA (not depicted).
When an aircraft enters the CAUTION AREA, a “TA” (Traffic Advisory) is issued. This
would consist of an audible and visual warning in the cockpit.
When an intruder enters the COLLISION AREA, the TCAS will issue a “RA” (Resolution
Advisory). “RA’s” consist of audible and visual warnings and possible instructions to avoid
a collision.
A TCAS display will vary dependent on the manufacturer. Typically, a TCAS I system, as
shown in figure 2-11, will display Traffic Advisories. A TCAS II System will be
incorporated with a Vertical Speed Indicator (VSI), which will issue a RA, the pilots VSI
will display a course of action to avoid a collision with an aircraft located in the
COLLISION AREA.
2-29
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T-49C MOD 2 90 008 048-2
2.14.2 TCAS Intruder Types and Scenarios
The operator is able to select four (4) separate Intruder scenarios by means of the SCENARIO
select knob on the front of the T-49C Test Set. Table 2-4 lists each scenario available.
Selectable
Scenarios
+3500/-3500
Intruder
Speed
300 kts.
Intruder
Range
14 to 0 nmi.
Altitude
Separation
3500 ft.
0
+4000/-4000
+200/-200
300 kts.
300 kts.
300 kts.
14 to 0 nmi.
14 to 0 nmi.
14 to 0 nmi.
0
4000 ft.
200 ft.
Altitude Offset
Altitude offset will decrease as
distance decreases or ViceVersa
Constant
Constant
Constant
TCAS Intruder Scenarios
Table 2-4
The operator may also select what type of Intruder to simulate. MODE 3A/C and MODE S are
available by turning the TCAS INTRUDER select knob on the T-49C.
NOTE
The TCAS position on the TCAS INTRUDER select knob is identical in
use as the MODE S position. This was incorporated into the T-49 T/S for
possible future expansion.
2.14.3 TCAS Testing Cautions
Due to the nature of operating a TCAS system, especially Mode S equipped, the potential exists
to create false targets in the airspace surrounding the test area, causing local aircraft and FAA
ATC Centers to display false intruders.
The TAP-135 antenna couplers offer sufficient attenuation to suppress the transponder output
during TCAS testing. Place the coupler tightly over the unused antenna during TCAS testing to
minimize false target problems. The coupler does not require connector termination when utilized
in this fashion.
2.14.4 TCAS Test Sequence
The Test Set utilizes the Directional Antenna for TCAS simulation. This offers the operator the
ability to move the Test Set to different locations around the aircraft to check if correct heading
information is being shown on the TCAS Display. Refer to Paragraph 2.10.2 on Directional
Antenna procedures.
To configure the Test Set to simulate an intruder aircraft, the AUT (Aircraft Under Test) altitude
must be known. Typically, the Intruder Altitude is set to the same altitude as the AUT to ensure
that the simulated Intruder converges with the AUT for verification of al RA’s and TA’s.
2-30
Rev D
T-49C MOD 2 90 008 048-2
The T-49 will automatically acquire the AUT altitude by conducting a MODE C test upon turning
on the Test Set. If the transponder is not operating properly, or is powered down, the operator
may still enter the altitude manually.
1. Start the Intruder Scenario by selecting the type of intruder to be simulated. Utilize
the TCAS INTRUDER TYPE switch to select either a MODE S or an ATCRBS
intruder.
TYPE
ATCRBS
MODE S
TCAS
ATCRBS/MODE S
XPDR TEST
An ATCRBS Intruder is shown selected.
2. Use the SCENARIO switch to select the appropriate Intruder simulation. The
operator may also select an offset of above the AUT (+) or below the AUT (-) for any
scenario, with the exception of the 0 Offset Scenario (as shown here).
ALTITUDE
OFFSET
+
14 NMI
+200
-200
0 NMI
+4000
-4000
0
+3500
-3500
The 0 ft. Offset Scenario is shown selected.
3. Turn the Test Set “ON” by depressing the TEST or INTERROGATE button.
4. The Test Set will briefly display the Start Screen.
TEL INSTRUMENT
T-49C
REV . 6.10
2-31
Rev D
T-49C MOD 2 90 008 048-2
5. The Test Set will automatically conduct a MODE C Test to obtain the current aircraft
altitude. If the Altitude is unavailable, the Test Set will briefly display:
MODE C ALTITUDE
NOT AVAILABLE
Followed by the TCAS SETUP Screen.
ALT 3,800’ CONT: STR
SLEW UP: TEST DN: INTR
6. Enter the AUT Altitude, if not obtained as in Step 5, by pressing the TEST and
INTERROGATE buttons to the desired altitude. The Altitude is adjustable in 100’
increments from -1000 ft. to +99,900 ft.
NOTE
If the AUT altitude is changed while testing is in progress, the operator
may have to reinitialize the Test over to reacquire the MODE C altitude or
manually insert the altitude.
7. Toggle the STORE/REPEAT switch “Down” to store the entered values. The Test Set
will display the selected intruder Start Page.
REPEAT
OFF
STORE/
REPEAT
TCAS INTRUDER
PRESS INTERROGATE
MODE S INTRUDER
INTERROGATE
OR
PRESS
MODE 3A/C INTRUDER
OR INTERROGATE
PRESS
8. Press the INTERROGATE button to initiate the TCAS Simulation.
Intruder Range
Intruder Relative Altitude
14 NMI -0 FT
AUT
ALT
Intruder Velocity
300 KTS
3800 FT
Altitude of Aircraft Under Test
2-32
Rev D
T-49C MOD 2 90 008 048-2
Range- 14 nmi.
Speed-300 kts.
Simulated
Intruder
Aircraft
AUT
"Pumped Up"
UUT Altitude
3800 ft.
Simulated Intruder
Altitude
3800 ft.
The Scenario will run from 14 nmi. to 0 nmi. and return back to 14 nmi. It will continue this cycle
until another scenario is selected, the Test Set is turned “OFF” or times out.
Intruder Range
Intruder Relative Altitude
2
NMI -0 FT
AUT
ALT
Intruder Velocity
300 KTS
3800 FT
Altitude of Aircraft Under Test
RANGE- 2 nmi.
SPEED- 300 kts.
Simulated
Intruder
Aircraft
Simulated Intruder
Altitude
3800 ft.
AUT
"Pumped Up"
UUT Altitude
3800 ft.
When utilizing the +3500/-3500 Intruder Selection. The T-49C altitude will also increase or
decrease (dependent on offset selected) altitude to intercept the Aircraft Under Test altitude.
When the altitude and range converge, the test will reverse back out to the 14 nmi. initial range.
2-33
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T-49C MOD 2 90 008 048-2
Starting Intruder Range
Starting Intruder Relative Altitude (Negative Offset Selected)
14 NMI +1500FT 300 KTS
AUT
ALT
3800 FT
Simulated
Intruder
Aircraft
Ra
nge
- 14
nm
Sp
eed
i
- 30
0k
ts.
Simulated Intruder
Altitude
5300 ft.
UUT
"Pumped Up"
AUT Altitude
3800 ft.
As the Range Decreases, the relative Altitude also decreases until they converge at 0 nmi. and 0
FT.
Range Converging
Altitude Converging
07 NMI +700 FT 300 KTS
AUT
ALT
3800 FT
Simulated
Intruder
Aircraft
Rang
e- 7 n
mi
Spee
d- 30
0 kts
.
UUT
Simulated Intruder
Altitude
4500 ft.
"Pumped Up"
AUT Altitude
3800 ft.
Once the Intruder Simulation reaches 0, the simulation will reverse direction and return back to 14
nmi.
2-34
Rev D
T-49C MOD 2 90 008 048-2
Range Increasing
Altitude Increasing
1 NMI +100 FT 300 KTS
AUT
ALT
3800 FT
Simulated
Intruder
Aircraft
RAN
GE
1
nm
i.
Simulated Intruder
Altitude
3900 ft.
UUT
"Pumped Up"
AUT Altitude
3800 ft.
9. When you are unable to observe the simulated target on the TCAS display, reposition
the TCAS directional Antenna to a different location. Observe that there are no
obstructions between the Test Set and the AUT TCAS Antenna. If no display is still
present, place the TCAS/HI-XPDR/TCAS/LO switch to the HI position.
TCAS/HI
XPDR/TCAS/LO
By placing the switch in HI, the Test Set power was increased by +10 dBm. Ensure to
return the switch back to the LO position when testing is complete.
10. At any time during the sequence, the operator may HALT the simulation at any point.
The Test Set can then be moved to another location around the AUT to verify correct
bearing and heading. Press the TEST button a second time to resume the simulation.
2-35
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2.15
T-49C MOD 2 90 008 048-2
RS-232 Download Procedures
Test Sets with Software Revision 7.00 or greater contains memory to down load results
received during the AUTOMATIC sequence of tests to a PC thru the use of the RS-232
port located on the front panel of the Test Set. Once downloaded, the information can be
displayed in an Excel file to be viewed and saved for future reference. The following
Tests and results are captured to the Test Set’s memory:
1.
MODE 3A & SLS
Re: Mode A Reply, Mode A Code, MA SLS
2.
MODE 3C
Re: Mode C Reply, Mode C Altitude
3.
MODE 3A ALL CALL
Re: Mode A & C Reply, MA and C Address
4.
MODE 3C ALL CALL
Re: MC & A Reply, Mode A & C Address
5.
MODE 3A ONLY
Re: Results
6.
MODE C ONLY
Re: Results
7.
MODE S SURVEILLANCE IDENTITY
Re: DF5 Reply, DF5 ID, DF5, Flight Status
8.
MODE S SUVEILLANCE ALTITUDE
Re: DF4 Reply, DF4 Altitude, DF4 Flight Status
9.
MODE S SURVEILLANCE SHORT
Re: DF0 Reply, DF0 Altitude, DF0 VS
10.
MODE S COMM IDENTITY
Re: DF20 Reply, DF20 ID, DF20 Flight ID
11.
MODE S COMM ALTITUDE
Re: DF20 Reply, DF20 Altitude
12.
UNDESIRED REPLIES
Re: Results
13.
SQUITTER
Re: ACQ Per, ACQ Address, Ext PER, Extended Address
14.
DIVERSITY
Re: Results
15.
POWER, SENSITIVITY, AND FREQUENCY
Re: Power (in dB), Power (in Watts), MA Sensitivity, MC
Sensitivity, and Frequency
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T-49C MOD 2 90 008 048-2
The Test Set Captures up to 25 series of tests, after capturing the 25th test, the Test Set
will then begin overwriting the oldest captured data. The software required to download
the stored information is part of the Test Set memory. No external software is required to
be loaded onto the PC to accomplish the transfer.
Results are transferred via a RS-232 Cable (not supplied) to a COMM port on the
computer at a 4800-baud rate. With the computer HyperTerminal, the data is downloaded
as a comma delimited file, which can be opened in an Excel spreadsheet program. The
operator may also choose to put it in another file of their choice.
2.15.1 Setting Up Your Computer for RS-232 Download
It is necessary to configure your Computer to properly display the data downloaded.
Once this is accomplished, the operator can then sort the data in the excel file in any way
they prefer. The T-49C Test Set utilizes a Hyper Terminal Program that is part of the
Microsoft Windows Operating System. If this is not installed on your computer, you can
obtain the program from the Microsoft Website or from your Windows Software the was
supplied with your Computer. The following describes a suggested way to configure your
computer to properly display the data.
The following procedures are abbreviated and may not match your
operating system exactly; contact your computer administrator or
computer manufacturer for assistance.
NOTE
1.
Select START on the computer desktop.
2.
Select PROGRAMS.
3.
Select ACCESSORIES.
4.
Select COMMUNICATIONS.
5.
Select HYPER TERMINAL.
6.
Enter a name for the Terminal Connection (e.g. – T-49C).
7.
Select CONNECT TO and pick the correct COM port you will be utilizing
on your computer. For most users, this will be COM1.
8.
Set the Port Settings to the following.
a. BIT PER SECOND – 4800
b. DATA BITS – 8
c. PARITY – None
d. STOP BITS – 1
e. FLOW CONTROL – Hardware
9.
Select APPLY.
10.
Select OK.
2-37
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T-49C MOD 2 90 008 048-2
Close the Program. You have not created a permanent short cut configured for
the T-49C RS-232 download feature. You will not be required to repeat this
procedure. When preparing to download data, select the T-49C Hyper Terminal
that should be located within the Hyper Terminal program selection dropdown.
2.15.2 Downloading the Data
Ensure the Test Set is OFF before connecting the Test Set to your computer.
1.
Connect a standard RS-232 extension cable (not supplied) to the RS232 connector located on the front panel of the Test Set and connect the
other ends to the COM Port that was selected paragraph 2.15.1 step 7
(typically COM1).
2.
On the computer, select the T-49C Short Cut that was created in the
paragraph 2.15.1.
3.
Select TRANSFER from the Hyper-Terminal drop down menu.
4.
Select CAPTURE TEXT and save the file to your desktop
(recommended) and name the file to your preference but utilize a .csv
extension (for example - Serial Number 2345Date.csv). Select START.
5.
Press the INTERROGATE or the TEST switch on the T-49C to begin
downloading the data and observe the following:
TEL-INSTRUMENT
Transferring Data…
The data will download to the Hyper-Terminal program and can then be
observed on the computer display. Once all of the data has been
transferred, the Test Set will indicate:
Output Completed
Press Test To Erase
Select TRANSFER on the Hyper-Terminal drop-down menu, then
CAPTURE TEXT and STOP. The data is now saved to the file. The
operator may now choose to erase the stored data on the Test Set by
pressing the TEST button on the Test Set. Simply turn the Test Set OFF
if you desire to keep the file in the memory.
6.
Turn OFF the Test Set and disconnect the RS-232 cable.
2-38
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T-49C MOD 2 90 008 048-2
2.15.3 Loading the Data to a Microsoft Excel File
1.
Open up Microsoft Excel; do not double click on the file stored on the
computers Desktop. Select FILE then OPEN. Locate the file on the
Desktop (or wherever it was saved to) and open the file.
2.
Depending on the edition of Microsoft Excel you currently have, the file
may directly open and can then be organized as necessary. If the
IMPORT WIZARD opens, follow step 3, if the file opened properly, skip
to step 4.
3.
If the IMPORT FILE WIZARD opens, select a DELIMITED file then click
NEXT. Select COMMA-DELIMITED and deselect all others. Select
NEXT and FINISH.
4.
Once the file is loaded onto the Excel Spreadsheet, the operator can
choose how to organize and display the information. By selecting “Auto
Fit” options and selecting the appropriate Text, the operator can modify
the spacing between each block. Refer to the Excel help file for further
information.
2-39
Rev D
T-49C 90 008 048-2
CHAPTER III
PRINCIPLES OF OPERATION
3.1
General
The Test Set contains a transmitter and receiver that communicate with the Traffic Alert and
Collision Avoidance System (TCAS) or transponder (XPDR) under test. Both transmitter and
receiver are capable of operating on either 1030 MHz or 1090 MHz, with both pulse amplitude
and Differential Phase Shift Keying (DPSK) modulation.
3.2
Test Modes
3.2.1
ATCRBS (Mode A/C) and Mode S Transponder Testing
When the TYPE switch is set to ATCRBS/MODE S, XPDR TEST the test set simulates
secondary radar, radiates interrogations Mode A/C to the transponder under test, and
receives the reply. A series of ATCRBS (Mode A/C) interrogations are transmitted,
followed by Mode S interrogations. The test set analyzes the replies of the transponder
under test, both Mode A/C and Mode S, to insure that they are the correct reply for the
interrogation.
3.2.2
TCAS Testing
For TCAS testing, the Test Set simulates an intruder by replying to UUT TCAS
interrogations with the characteristics of a specific transponder type, as selected by the
front panel rotary switch. Squitter and other un-requested third party reply transmissions
are also provided.
When the TCAS INTRUDER TYPE switch is set to TCAS or MODE S, the Test Set will
only respond to Mode S interrogations. In addition to replies, the Test Set also provides
normal squitter with downlink format 11 (All-Call Reply), as well as simulated replies to
interrogators other than the TCAS system with downlink format 4 (Surveillance, Altitude).
Replies to Mode S interrogations from the TCAS UUT will be in downlink format 0 (Short
Special Surveillance).
The TCAS system determines the existence of a potential Mode S intruder by receiving
squitter and other simulated interrogation replies from the Test Set. The Test Set
intruder's address may be obtained from the squitters, while the altitude is available from
downlink format 4. Thus, without interrogating the potential intruder, the TCAS system
may discern the altitude and the address of the Test Set simulated intruder.
3-1
Rev D
T-49C 90 008 048-2
If the Test Set intruder altitude, or altitude rate, are determined by the TCAS system to
require further information, the TCAS system will interrogate the simulated intruder using
the address obtained from the received squitter or simulated third party replies. By
measuring the elapsed time from the initiation of the interrogation to the receipt of the
reply, the TCAS system will determine its distance from the Test Set intruder. The Test
Set computes and reduces the time delay (and altitude offset) in order to simulate a
converging track.
When in the TCAS intruder mode, the address used for the Test Set is selected to be one
digit lower than the UUT address. Should two TCAS equipped aircraft decide to issue a
resolution advisory simultaneously, the TCAS aircraft with the higher address will be
given priority. To insure that the aircraft under test issues the correct advisory, the Test
Set address will be forced to be the lower address for all cases.
When the TCAS INTRUDER TYPE switch is set to ATCRBS for TCAS Testing, the Test
Set will provide replies to ATCRBS Mode 3A or C interrogations. Simulated reply
distances at 14 nautical miles down to 0 nautical miles are provided by varying the reply
time delay. The TCAS UUT sees the Test Set reply as an aircraft converging on the
TCAS equipped aircraft under test. The altitude of the aircraft under test (AUT) may be
obtained by using the Test Set in ATCRBS/MODE S XPDR TEST and interrogating the
AUT in Mode C or entered manually by pressing the TEST and INTERROGATE buttons
at the TCAS start page. An offset altitude is added or subtracted from the AUT altitude to
represent the altitude of the Test Set simulated intruder aircraft. This offset altitude may
be fixed or variable depending on the scenario selection using the Test Set front panel
switches.
3.3
Theory of Operation
The T-49C Test Set contains a transmitter and receiver which communicates with the TCAS or
Transponder under test. The Test Set transmitter and receiver are capable of operating on either
1030.0 MHz or 1090.0 MHz, with both pulse amplitude and DPSK modulation (1030.0 MHz only).
3.3.1
RF Transmitter
The transmitter section generates the desired carrier frequency using a frequency
synthesizer. The Oscillator, Q6, is a varactor-tuned oscillator that is followed by two
stages of buffer amplifiers, U22 and U23, to ensure minimal frequency modulation due to
the phased amplitude modulation applied to the carrier. A divide-by256 prescaler, U33, is
fed from the first buffer amplifier and drives the phase detector U36. The phase detector
output drives a single loop filter/amplifier, which in turn closes the loop by feeding the
varactor diode, Q8 and Q11, of the VCO.
The transmitter oscillator is operated on one of two frequencies. By selecting one of two
crystal oscillators at 1090.0/256 = 4.257812 MHz, Y3, or 1030.0/256 = 4.0234225 MHz,
Y4. The desired oscillator, Y3 or Y4 is selected by applying power to oscillator.
Modulation is applied to the transmitter carrier by using a combination of two methods. A
balanced mixer, U28, provides either amplitude modulation or Phase Shift Keying
Modulation. Following the balanced mixer, buffer amplifiers U25 and U26 are modulated
by the DAC. These amplifiers provide 20 dB of gain variation. U11 is gated to provide
3-2
Rev D
T-49C 90 008 048-2
further amplitude modulation since the balanced mixer would not provide sufficient on/off
ratio.
An analog switch, U27, under digital control, provides the modulation to the balanced
mixer. This analog switch provides positive and negative current into the balanced mixer
to provide both phase in-phase and reverse-phase for DPSK modulation. In addition, this
chip provides power switching for the buffer amplifier U11 through Q12 and Q13. R96 is
utilized to adjust the Side Lobe Suppression (SLS) P2 power level.
3.3.2
RF Receiver
The receiver is a single-conversion superheterodyne using an IF of 45.00 MHz. The local
oscillator frequencies used are 1045 MHz, for receiving 1090 MHz, and 1075 MHz, for
receiving 1030 MHz. Since the pulse and DPSK modulations employed in transponder
and TCAS technologies are not spectrum sensitive, the resultant inverted spectra are not
a factor. The use of both high side and low side injection was done to reduce the
frequency spread of the local oscillator and therefore, enhance the lock-up time. In
addition, the 45 MHz IF, rather than the conventional 60 MHz, prevents the receiver local
oscillator from being present at the transmit frequency and, therefore, avoiding the
difficult task of reducing to an acceptable level the amount of local oscillator radiation.
The receiver input feeds a broadly tuned transmission line resonator filter which passes
both 1030 and 1090 MHz. The mixer follows, which is fed the local oscillator from the
output of the two buffer amplifiers, U19 and U3). The mixer output is followed by amplifier
U4 which feeds a two-pole IF filter tuned to 45 MHz.
The IF amplifier is a logarithmic amplifier. It is important that the receiver have
characteristics similar to an airborne transponder so that it will react in a similar fashion to
the "whisper-shout" interrogations from the TCAS computer. Therefore, the receiver uses
a pulse amplitude-following detector to provide pulse amplitude discrimination similar to
that found in a typical ATCRBS (Mode A/C) transponder.
3.3.3
Power, Frequency and Sensitivity Measurements
With a TAP-135 or TAP-141 connected, the Test Set measures the frequency and the
power output of the MODE S or ATCRBS transponder under test. The frequency
measurement is made using a frequency discriminator in the receiver IF at 45 MHz.
Whenever pulses are received, the output of the frequency discriminator is gated to an
integrator. Immediately preceding the measurement period, a 45 MHz calibration
oscillator is energized and the center frequency of the discriminator is adjusted using a
varactor diode. The analog output from the discriminator is fed to an A/D converter for
conversion and reading by the microprocessor.
To measure transponder power and receiver sensitivity, a TAP-135 or TAP-141 must be
connected to the Test Set.
Rectified transmitter pulses are fed to the peak power measuring circuit consisting of
U29, U30, Q14 and Q15. This is a peak following circuit where a capacitor, C121, is
charged by the comparator, U29, to the peak of the input pulse. The capacitor voltage is
3-3
Rev D
T-49C 90 008 048-2
fed to a buffer amplifier and amplified by an op-amp, U30. The output of this amplifier is
converted with the A/D converter U32 and is read by the microprocessor.
To measure receiver sensitivity, the signal level from the test set is steadily reduced while
the replies from the transponder under test are monitored. The level of output signal is
controlled by applying a negative bias to the output amplifiers through a D/A converter,
(U3, located on the digital board) under control of the microprocessor. When the reply
efficiency has reduced to 90% in the ATCRBS mode and 99% in the Mode S mode, the
microprocessor reads the last level applied to the D/A converter and calculates the
equivalent receiver sensitivity.
3.3.4
Diversity Measurements
Diversity is measured by comparing the magnitude of two successive squitter
transmissions from a Mode S transponder using the peak power measurements
described above. The TAP-135 anti-radiation/diversity couplers are placed over both
Mode S transponder antennas. The coax cable from one coupler is first connected, and
the diversity check run, and then this test is repeated with the other coupler connected.
The cable from the unused coupler does not have to be terminated. These tests
determine whether the leakage from the active antenna is less than 20dB. The use of the
TAP-135 couplers also reduces external radiation by over 20dB.
3.3.5
Microprocessor
The digital board contains the microprocessor and all of the bus-connected peripheral
chips. The microprocessor, U4, is a CMOS 80C31AH. The program memory, U13, has
256K bits. The RAM, U11, is battery backed for storing test data while IC's U1-U9 are
latches for interfacing with various peripheral circuits including those located on the RF
board. U14 is a latched demultiplexer decoder that is used for demultiplexing some of the
latches and providing other control signals.
When testing transponders, the transmitter modulation is generated by a first-in first-out
(FIFO) chip, U46. The required pulse train for the modulation envelope is loaded into the
FIFO at a slow rate and clocked out at a much faster rate for the interrogations. This is
necessary, because the microprocessor is not capable of providing the necessary pulse
manipulations at the necessary clock speeds. The microprocessor is incapable of storing
and analyzing the data as received from the transponder under test. Therefore, the
received data are clocked into the same FIFO at real time, to be stored temporarily, and
then clocked out by the microprocessor at a slower rate for analysis. Since transmitting
and receiving occur at two different times, the same FIFO may serve both purposes.
FIFO, U46, is used for receiving and transmitting transponder tests.
In the case of TCAS testing, the possible replies are loaded and stored into a second
FIFO, U37. The received interrogations are decoded, using logic elements, and the
desired reply is selected and transmitted without microprocessor assistance. The nature
of the interrogation is then investigated and should any changes be made to the reply,
the FIFO is loaded with the new data, which will constitute the next reply. Because of the
need to retain the reply message within a FIFO, while the test set is receiving, two FIFO’s
are required. U46 is used for receiving while U37 contains the possible transmit
messages.
3-4
Rev D
T-49C 90 008 048-2
The received interrogation for TCAS testing is decoded using discrete logic due to the
time constraints involving the microprocessor. The Mode C and Mode S decode circuitry
are clocked using a 20 MHz clock for 50 ns maximum jitter. Decoding either a valid Mode
C or Mode S interrogation results in a reply for the interrogation mode. U18 through U27
are the ICs involved in this decoding process.
After either a Mode S or Mode C interrogation has been decoded, a range delay is
inserted before a reply is transmitted. This time delay is variable and programmed by the
microprocessor.
3.3.6
Battery Charger and Power Supply
Power for the Test Set is supplied by a set of rechargeable Ni-Cad cells, B1. A battery
charging circuit, capable of fully charging a depleted battery in 16 hours, is provided.
Charging current level is only about half of that required to operate the Test Set.
Operating the Test Set at 50% duty cycle, with the charger on, will result in a no net
change in the state of charge of the battery.
The battery charger is a simple full wave bridge rectifier consisting of diodes CR4-CR7
with a series resistor for current limiting. The battery charger also supplies current to the
front panel green LED indicator that will indicate that the battery charger is operating. The
power supply control circuits are located on the digital board.
The Test Set is provided with two DC fuses, F1 and F2 both of which are located behind
the front panel in the return line of the battery. This is done so that if a tool touches the
fuse holders during assembly or disassembly or when removing the fuses, it will not
result in a short across the battery. The Ni-Cad battery is capable of providing very large
peak energy and a direct short across the battery could result in damage to the
interconnecting wires.
The battery charger has a separate fuse so that if the battery fuse is open, the unit will
not operate on the battery charger voltage that is uncontrolled and is capable of causing
damage to the unit. The unit is provided with a dual primary transformer T1 for operation
at supply voltages of 110 VAC. Two line voltage fuses F3 and F4 are provided for
protection. An inverter located on inverter board A5 provides 70 VRMS, 400 Hz power for
the LCD backlighting.
All positive operating voltages for the test set are derived from linear integrated circuit
regulators U56 and U55. A switching regulator, U51, is provided to supply -10 volts for
those circuits requiring a negative supply voltage. A 900 second timer circuit
automatically shuts-off the unit. The output is fed to 4096 counter U17 that in turn shuts
the unit off if the time has expired. The LIGHTS/OFF front panel switch may be used to
force the unit to off before the 200-second period has elapsed. The integrated circuit,
U21, provides interfacing for the RS-232 connector. This circuit provides -9VDC for this
interface.
3-5
Rev D
T-49C 90 008 048-2
T-49C
TCAS/MODE S/ATCRBS
RAMP TEST SET
90 000 048 (A1)
PANEL ASSEMBLY
89 000 100 (A3)
CASE ASSEMBLY
89 000 105 (A2)
PCB ASSEMBLY
DIGITAL (A7)
80 065 001
CHASSIS DETAIL
62 000 014
CABLE ASSEMBLY
AC LINE CORD (W1)
75 010 025
CASE DETAIL
EDAK
64 030 034
CABLE ASSEMBLY (W9)
DIG RANGE TO DIG
75 010 016
PANEL DETAIL
61 060 015
ANTI-RADIATION
COUPLER ASSEMBLY
LOWER ANTENNA
TAP-135
89 000 043 (A13)
CASE INSERT
DETAIL-FOAM
31 000 007
PCB ASSEMBLY
DIGITAL RANGE (A8)
80 087 001
FRONT PANEL
INTERCONNECT
89 003 100
PCB ASSEMBLY
INVERTER (A5)
80 067 001
RF BOX ASSEMBLY
89 000 022 (A10)
CABLE ASSEMBLY
DIGITAL TO RF (W4)
75 010 027
PCB ASSEMBLY, RF
80 079 001 (A9)
CABLE ASSEMBLY
DIGITAL TO LCD (W5)
75 010 028
PCB ASSEMBLY
COUPLER (A6)
80 064 001
CABLE ASSEMBLY
ACCESSORIES (W2)
75 010 030
CABLE ASSEMBLY
RF COAX (W8)
75 010 033
OMNI-ANTENNA
TSP-1A
40 030 011
PCB ASSEMBLY
ANTI-RADIATION COUPLER
80 094 001 (A14)
COUPLER ASSEMBLY
DIRECT CONNECT
TAP-141 (A15)
89 000 051
(OPTIONAL)
PCB ASSEMBLY
DIRECT CONNECT
80 047 001 (A16)
RS-232 PROGRAM
(UNDER DEVELOPMENT)
CABLE ASSEMBLY
RF/ANTENNA FP (W7)
75 010 029
DIRECT ANTENNA
ASSEMBLY (A12)
89 000 028
PCB ASSEMBLY
DIRECT ANTENNA (A20)
80 068 001
CABLE ASSEMBLY
DIR ANTENNA (W11)
75 010 036
OPERATIONAL MANUAL
90 008 048
T-49C Configuration Chart
Figure 3-1
3-6
AC
INPUT
F1
T1
DS1
P401
J402
W
5
J701
P701
DIGITAL RANGE
BOARD
A8 ASSY
P801
J801
W9
J705
P705
DIGITAL
BOARD
A7 ASSY
LCD DISPLAY
P703
INVERTER BOARD
A5 ASSY
INVERTER
FRONT PANEL
ASSY A3
F2
B1
12V
F3
F4
W4
T-49CA
TAP-135 (10ft)
TAP-135 (50 ft)
TAP-141(Optional)
T-49C
TAP-135 (10ft)
TAP-141(Optional)
RF BOARD
A9 ASSY
A6
A10 RF BOX ASSY
P3
P3
J2
W7
P2
J1
Rev D
T-49C 90 008 048-2
J901
P901
J702
P702
J703
+
T-49C/CA Simplified Block Diagram
Figure 3-2
3-7
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