Watkins-Johnson Company AN/PRD-11 User manual
TM 11-5825-278-12-2
SAFETY SUMMARY
High voltage is used in the operation of this equipment.
Death
on contact may result if personnel fail to observe the followinq
—
safety
precautions (For Artificial Respiration, refer to FM 21-11):
Do not be misled by the term “Low Voltage.” Potentials as
low as 50 volts may cause death under adverse conditions.
Remove the batteries to the equipment when radio operation
has ceased.
Leaving batteries in the equipment when it is
not in use can cause leakage or an explosion leading to
serious bodily damage.
When using any kind of batteries, be careful not to crush,
puncture, dissemble or otherwise mutilate them in order to
avoid possible injury to personnel or damage to the
equipment.
Do not attempt to recharge alkaline or magnesium batteries.
When using nickel-cadmium batteries, observe extreme caution
when recharging by ensuring proper electrical connections
and keeping the charger away from other equipment that may
spark and cause an explosion.
Do not remove the protective covers to the equipment unless
you are authorized to do so.
Do not work on electronic equipment unless there is another
person nearby who is familiar with the operation and hazards
of the equipment and who is competent in administering first
aid.
Whenever possible, turn off the power supply to the
equipment before beginning maintenance on the equipment.
Technician must tell operators where dangerous areas are.
A periodic review of safety precautions in TB 385-4, Safety
Precautions For Maintenance of Electrical/ Electronic
Equipment, is recommended.
Seek advice from your supervisor whenever you are in doubt
about electrical safety conditions.
To prevent electrical shocks or damage to the equipment, do not
operate your direction finder set until you understand the operation
and function of all controls, indicators and connectors.
A
TM 11-5825-278-12-2
Battery BA-5598/U used in this equipment is hazardous.
It can
explode or generate high heat and catch fire during use or storage.
This hazard is present even after the battery is discharged and can
no longer operate the equipment. Take the following precautions:
Remove other combustibles from BA-5598/U storage area.
Do not mishandle the battery (short cells, try to charge,
incinerate,
take apart, crush case or damage by dropping).
Protect hands from burns when removing overheated batteries
from equipment. Allow equipment to cool off if possible.
If equipment case becomes hot, immediately shut equipment
off.
Do not discard discharged batteries with combustibles.
Do not remove the protective covers to any of the units.
Voltages within these units can cause electrical shock.
Turn off
all power to the units before replacing any of the fuses.
Brackets and cable guide inside front covers have sharp edges
and may cut fingers.
Be careful that you do not catch your fingers as tripod legs
close.
The df antenna is easily damaged through careless or improper
handling.
Use care when setting up the df antenna.
The df antenna is easily damaged through careless or improper
handling.
Use care when tearing down the df antenna.
Do not position the tripod on a slope that is too steep to set
all legs securely on ground. Antenna should not lean more than 30O
from vertical.
Examine antenna mast cables to ensure they will not catch on
thumbscrew.
B
TM 11-5825-278-12-2
Do not force compass arm assembly into compass mounting plate.
Aluminum tip will bend and may not be able to be removed.
If D-cell insert contains batteries:
Do not remove batteries before removing cardboard tubes.
Do not use metal tools to remove batteries or you will short
them out.
Wrap cables in loose circles sized to fit within the antenna
carrying bag. If the cables are too tightly wrapped, they will
break.
Before lowering antenna arm be sure antenna mast cables are free
of locking thumbscrews.
Ensure the correct single pin cable is connected to correct plug.
Do not overtighten any of the six single pin cables onto their plugs.
Turn off power to the direction finder set before using angle
simulator.
Do not pack any unit without first ensuring that the batteries
have been removed from the rear covers.
C/(D blank)
TM 11-5825-278-12-2
TECHNICAL MANUAL
NO. 11-5825-278-12-2
Operator’
RADIO
HEADQUARTERS
DEPARTMENT OF THE
Washington, DC, 13
s and Organizational Maintenance Manual
RECEIVER DIRECTION FINDER SET
AN/PRD-11
(NSN 5825-01-188-3435)
September,
REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS
You can help improve this manual. If you find any mistakes
or if you know of a way to improve the procedures, please
let us know.
Mail your letter, DA Form 2028 (Recommended
Changes to Publications and Blank Forms), or DA Form 2028-2
located in the back of this manual direct to: Commander, US
Army Communications-Electronics Command and Fort Monmouth,
ATTN: AMSEL-ME-MP, Fort Monmouth, New Jersey 07703-5007. A
reply will be furnished direct to you.
ARMY
1985
CHAPTER 1
Section I
II
III
CHAPTER 2
Section I
II
III
IV
CHAPTER 3
Section I
II
III
IV
CHAPTER 4
Section I
II
III
IV
V
VI
HOW TO USE THIS MANUAL
. . . . . . . . . . . . . . . . . . . . . . . .
INTRODUCTION
. . . . . . . . . . . . . . . . . . .
General Information . . . . . . . . . . . . . . . . . . .
Equipment Description . . . . . . . . . . . . . . . . . . .
Principles of Operation . . . . . . . . . . . . . . . .
OPERATING Instruction . . . . . . . . . . . . . . . . . . .
Description and Use of Operator
Controls,
Indicators and Connectors . . . . . . . .
Operator Preventive Maintenance
Checks and Services...........
Operation Under Usual Conditions . . . . . . . . . . . . . . .
Operation Under Unusual Conditions . . . . .
OPERATOR MAINTENANCE INSTRUCTIONS ............
Lubrication Instructions . . . . . . . . . . . .
Operator Troubleshooting .................
Operator Maintenance Procedures ..........
Maintenance of Auxiliary Equipment . . . . . . .
ORGANIZATIONAL MAINTENANCE INSTRUCTIONS......
Repair Parts, Special Tools, TMDE,
and Support Equipment. . . . . . . . . . . . . . . . . .
Service Upon Receipt . . . . . . . . . . . . . . .
Preventive Maintenance Checks
and Services . . . . . . . . . . . . . . . . . . . . .
Organizational Troubleshooting .............
Organizational Maintenance Procedures
.......
Preparing Equipment For Storage or Shipment . . . .
iii
1-1
1-1
1-9
1-16
2-1
2-1
2-13
2-15
2-124
3-1
3-1
3-1
3-19
3-27
4-1
4-1
4-2
4-3
4-3
4-39
4-66
i
TM 11-5825-278-12-2
APPENDIX A
B
C
D
E
REFERENCES
...............................................
MAINTENANCE ALLOCATION CHART
................................
COMPONENTS END ITEMS AND
BASIC
ISSUE ITEMS ...............................
ADDITIONAL AUTHORIZATION LIST . . . . . . . . . . .
EXPENDABLE SUPPLIES AND MATERIALS
LIST
.............................................................
INDEX ..........................................................................
Page
A-1
B-1
C-1
D-1
E-1
INDEX-1
ii
TM 11-5825-278-12-2
HOW TO USE THIS MANUAL
This manual tells about installing, operating and maintaining the
AN/PRD-11 Radio Receiver Direction Finder Set at the operator and
organizational maintenance level. You will find descriptions and
configurations as well as operator and maintenance instructions in
this manual.
Use the front cover locators and marked pages to quickly find the
parts of the manual shown on the cover. These portions of the
manual were chosen because they are most often used. This manual
has been divided into chapters, sections and paragraphs which are
numbered sequentially. Each large section begins with a ‘Section
Contents’
which lists each paragraph by title and page number. Each
paragraph that contains several different procedures also has an
index that lists the page number on which the procedure begins. In
addition , you will find a system of captions which will help you
quickly find the information you need. These captions name the
pieces of equipment and/or procedures that you will be doing. Some
of the procedures may actually consist of several smaller
procedures.
For example, ‘Removing’ and ‘Replacing’ are not
separate procedures. They are parts of a larger ‘Removing’ and
‘Replacing’
maintenance procedure.
iii
TM 11-5825-278-12-2
RADIO RECEIVER DIRECTION FINDER SET
AN/PRD-11
1-0
TM 11-5825-278-12-2
CHAPTER 1
INTRODUCTION
Section I.
GENERAL INFORMATION
SECTION CONTENTS
1-1.
1-2.
1-3.
1-4.
1-5.
1-6.
1-7.
1-8.
1-9.
1-10.
1-11.
Scope
Consolidated Index of Army Publications
and Blank Forms
Maintenance Forms, Records and Reports
Hand Receipt (-HR) Manuals
Destruction of Army Materiel to Prevent Enemy Use
Preparation for Storage or Shipment
Nomenclature Cross-Reference List
Reporting Equipment Improvement Recommendations
Warranty Information
List of Abbreviations
Glossary
Page
1-1
1-1
1-2
1-2
1-2
1-2
1-3
1-4
1-4
1-4
1-5
1-1. SCOPE
a.
Type of Manual. This is an Operator and Organizational
Maintenance technical manual.
b.
Model Numbers and Equipment Names. The Radio Receiver
Direction Finder Set, AN/PRD-11 consists of a Direction Finder
Antenna, AS-3732/PRD-11 or AS-3733/PRD-11, a Panoramic Indicator,
IP-1355/GRR-8(V), a Receiver, AN/GRR-8(V), and a Processor Display
Control, C-11495/PRD-11. This group of equipment will be referred
to in this manual as the direction finder-set. The direction finder
antenna will be known as the df antenna, the panoramic indicator as
the signal monitor, the receiver as the receiver and the processor
display control as the df processor.
c.
Purpose of Equipment. The direction finder set detects and
displays radio signal frequencies and provides line of bearing
information for the location of transmitting antennas.
1-2.
CONSOLIDATED INDEX OF ARMY PUBLICATIONS
Refer to the latest issue of DA Pam 310-1
there are new editions, changes or additional
pertaining to the equipment.
AND BLANK FORMS
to determine whether
publications
1-1
TM 11-5825-278-12-2
1-30 MAINTENANCE FORMS, RECORDS AND REPORTS
a.
Reports of Maintenance and Unsatisfactory
Equipment.
Department of the Army forms and procedures used for equipment
maintenance will be those prescribed by DA Pam 738-750 as contained
in Maintenance Management Update.
b.
Report of Packaginq and Handlinq
Deficiencies.
Fill out and
forward SF 364 (Report of Discrepancy (ROD)) as prescribed in AR
735-11-2/DLAR 4140.55/NAVMATINST 4355.73A/AFR 400-54/MCO 4430.3F.
c.
Discrepancy
in Shipment Report (DISREP) (SF 361). Fill out
and forward Discrepancy in Shipment Report (DISREP) (SF 361), as
prescribed in AR 55-38/NAVSUPINST 4610.33C/AFR 75-18/MCO
P4610.19/DLAR 4500.15.
1-4. HAND RECEIPT (-HR) MANUALS
This manual has a companion document with a TM number followed by
“-HR” (which stands for Hand Receipt).
The TM 11-5825-278-10-2HR
consists of preprinted hand receipts (DA Form 2062) that list end
item related equipment you must account for. As an aid to property
accountability, additional -HR manuals may be requisitioned from The
US Army Adjutant General Publications Center, Baltimore, MD, in
accordance with the procedures in Chapter 3, AR 310-2, and DA PAM
310-10.
1-5. DESTRUCTION OF ARMY ELECTRONICS MATERIEL
Destruction of Army electronics materiel to prevent enemy use
shall be in accordance with TM 750-244-2.
1-6. PREPARATION FOR STORAGE OR SHIPMENT
Administrative storage of equipment issued to and used by Army
activities will have preventive maintenance performed in accordance
with the PMCS charts before storing. When removing the equipment
from administrative storage the PMCS should be performed to assure
operational readiness. Disassembly and repacking of equipment for
shipment or limited storage are covered in paragraphs 4-12, 4-13 and
4-14.
1-2
TM 11-5825-278-12-2
1-7. NOMENCLATURE CROSS-REFERENCE LIST
The list below will help you identify the official nomenclature
of the major equipment items used with the direction finder set. It
also provides the common name used in the manual when it is differ-
ent from the official nomenclature. Official nomenclature must be
used when completing forms or when looking up technical manuals.
Common Name
Official Nomenclature
Battery
Battery, Dry
BA-4386/PRC-25
Battery charger Power Supply/BA
PP-7566/GRR-8(V)
Df antenna
Antenna, Direction Finder
AS-3732/PRD-11 and
Antenna, Direction Finder
AS-3733/PRD-11
Df processor
Control, Processor Display
C-11495/PRD-11
Direction finder set Radio Receiver Direction
Finder Set AN/PRD-11
D-Cell battery Battery BA-30
Headset
Headset H-251/U
Lithium battery Battery, non-rechargeable,
Lithium S02, BA-5598/U
Mounting tray Mounting Tray WJ-8640/MT
Nicad battery Battery, Storage
BB-586/U
Receiver
Receiver AN/GRR-8(V)
Signal monitor Indicator, Panoramic
IP-1355/GRR-8(V)
Tuner assembly Tuner, RF TN-586/GRR-8(V)
Tuner, RF TN-584/GRR-8(V)
Tuner, RF TN-585/GRR-8(V)
Whip antenna Antenna, Whip
AT-892/PRC-25
1-3
TM 11-5825-278-12-2
1-8. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS
If your direction finder set needs improvement, let us know.
Send us an EIR. You, the user, are the only one who can tell us
what you don’t like about your equipment. Let us know why you don’t
like the design. Put it on an SF 368 (Quality Deficiency Report).
Mail it to:
Commander, US Army Communications-Electronics Command
and Fort Monmouth, ATTN: AMSEL-ME-MP, Fort Monmouth, New Jersey
07703-5007.
We’ll send you a reply.
1-9. WARRANTY INFORMATION
The equipment associated with the direction finder set is
warranted by Watkins-Johnson Company for a period of two years
following delivery. It starts on the date found in block 23, DA
Form 2408-9,
in the logbook.
This warranty may contain repair
restrictions.
Report all defects in material or workmanship to your
supervisor.
1-10. LIST OF ABBREVIATIONS
The list below contains abbreviations used in this manual that may
be unfamiliar to you.
ADJ
AGC
am.
ANT.
BA
BC
BFO
bnc
CAL
crt
cw
DAFC
dc
df
ECM
fm
hf
if.
INTEG
INTEN
1-4
Adjust
Automatic Gain Control
amplitude modulation
antenna
Battery
Battery Charger
Beat Frequency Oscillator
bayonet connector
Calibrate
cathode ray tube
continuous wave
Digital Automatic Frequency Control
direct current
direction finding
Electronic Countermeasures
frequency modulation
high frequency
intermediate frequency
Integration
Intensity
TM 11-5825-278-12-2
1-10. LIST OF ABBREVIATIONS - Continued
kHz
kilohertz
LED
Light Emitting Diode
lob
line of bearing
lsb
lower sideband
MHz
Megahertz
NCE Net Control Element
nicad
nickel cadmium
rf
radio frequency
SM
Signal Monitor
uhf
ultra high frequency
usb
upper sideband
V dc
volts direct current
vhf
very high frequency
1-11. GLOSSARY
The glossary below contains words and phrases used in this manual
that may be unfamiliar to you.
Antenna element - The part of the df antenna that detects rf
signals.
Automatic gain control (agc) - A circuit which automatically
maintains the output volume of receiver regardless of the signal
strength.
Bandwidth - The range within the limits of a frequency band.
Cathode ray tube (crt) - A tube in the signal monitor which
produces a visible display of signals.
Continuous wave (cw) - A continuous flow of identical waves which
can be interrupted according to a code or modulated in amplitude
or frequency.
Digital readout - A numerical indication on the df processor and
receiver for 1ob readings.
Df antenna - An antenna whose elements can be turned off and on in
sequence in order to determine the direction of a transmitted
signal.
1-5
TM 11-5825-278-12-2
1-11. GLOSSARY - Continued
Df cut
- Determining probable location of a target transmitter based
on lines of bearing taken by only two direction finding stations.
Df fix
- A most probable location of a target transmitter based on a
line of bearing taken at three or more direction finding stations.
Df flash - An order to immediately tune to and obtain a line of
bearing on a specific frequency.
Df processor - An electronic device which controls the direction
finder antenna so as to determine the line of bearing on a
transmitted signal.
Df set - A group of specific electronic equipment composed of a
receiver,
df processor, signal monitor and a df antenna.
Direction Finding Station - One direction finder set in operation.
Fine tune - Adjusting a received signal for maximum reception.
Frequency - The number of complete cycles in one second of
alternating current.
Frequency band - A continuous and specific range of frequencies.
High bay - The elements of the df antenna that detect rf signals
between 150 and 500 MHz.
High frequency (hf) - Frequencies in the range of 3 to 30 MHz.
Kilohertz (kHz) - 1000 cycles per second.
Line of bearing (lob) - The measurement in degrees of the arrival
of a radio signal in relationship to north (grid, true or
magnetic) .
May also be called an azimuth or shot.
Lob display - The numerical and circular indication of the line of
bearing located on the front panel of the df processor.
Low bay - The elements of the df antenna that detect rf signals
between 20 to 175 MHz.
Lower sideband (lsb) - The lower range of two groups of frequencies.
Megahertz (MHz) - 1,000,000 cycles per second.
Net Control Element (NCE) - The command authority which assigns
mission tasks to the operator.
Orientation - Alining the df antenna to a compass point.
1-6
TM 11-5825-278-12-2
1-11. GLOSSARY - Continued
Receiver - An electronic device that receives incoming radio
signals and converts them to audio form.
Radio frequency (rf) - Incoming radio signals to a receiver.
Rf gain - An increase in the strength of a signal.
Signal -
An electrical wave that carries information.
Signal monitor - An electronic device that displays a signals
waveform.
Also called panoramic indicator.
Squelch - To quiet a receiver by reducing its gain.
Target transmitter - The source of radio transmissions in which a
direction finder set is monitoring.
Threshold - The point at which a signal is first detected.
Trace -
The pattern on the screen of a cathode ray tube (CRT).
Tune -
Adjust to a desired frequency.
Tuner assembly - An electronic device which may be adjusted to a
particular frequency.
Ultra high frequency (uhf) - Frequencies in the range of 300 to
3,000 MHz.
Upper sideband (usb) - The higher range of two groups of
frequencies.
Very high frequency (vhf) - Frequencies in the range of 30 to 300
MHz.
Waveform - A visual display of a signal.
1-7/(1-8 blank)
TM 11-5825-278-12-2
Section II.
EQUIPMENT DESCRIPTION
SECTION CONTENTS
Page
1-12.
Equipment Characteristics,
Capabilities and Features . . . . . . . . 1-9
1-13. Location and Description of Major Components . . . . .
1-10
1-14.
Differences Between Models . . . . . . . . . . . . . . 1-14
1-15.
Equipment Data . . . . . . . . . . . . . . . . . .
1-14
1-16.
Safety, Care and Handling . . . . . . . . . . . . .
1-16
1-12. EQUIPMENT CHARACTERISTICS, CAPABILITIES AND FEATURES
CHARACTERISTICS
Battery operated.
Portable, weatherproof and shockproof.
Usable as a manpack or mounted in a vehicle.
CAPABILITIES AND FEATURES
Detects radio frequency signals.
Provides digital line of bearing (lob) readings on
transmitting antennas with an accuracy of 1° under
ideal conditions.
Contains a circular LED dial on the df processor for
graphic line of bearing readings.
Contains an antenna mounted compass for true north
orientation.
1-9
TM 11-5825-278-12-2
1-13. LOCATION AND DESCRIPTION OF MAJOR COMPONENTS
a.
Radio Receiver Direction Finder Set AN/PRD-11 consists of a
signal monitor, a df processor, a receiver, and a df antenna.
All
of these units are interconnected by cables and powered by battery
packs.
During operation, the speaker assembly, receiver, df
processor and the signal monitor are stacked one on top of the
other.
The df antenna can be located up to 44 feet from the
equipment.
1.
DF ANTENNA.
Collects radio signals.
2.
SIGNAL MONITOR. Monitors am., fm and cw radio signals.
Provides visual waveform display of signal activity of the tuned
frequency.
Aids the operator in determining the amplitude of the
signal being received.
3.
DF PROCESSOR.
Provides switching signals to the antenna and
IF.
Input to the signal monitor. Provides a visual line of bearing
display and a digital bearing readout for the operator.
4.
RECEIVER.
Receives and provides audio output of am., fm and cw
radio signals.
5.
SPEAKER ASSEMBLY. Provides receiver audio output.
6.
SPEAKER CABLE. Interconnects the speaker to the receiver.
7.
RF CABLE.
Interconnects the df antenna to the receiver.
8.
DF CABLE.
Interconnects the df processor to the df antenna.
9.
DF PROCESSOR BNC CABLE. Interconnects the receiver to the df
processor.
10.
SIGNAL MONITOR BNC CABLE. Interconnects the df processor to
the signal monitor.
1-10
