ARMY TM 11-5895-1180-10
NAVY
AIR FORCE
MARINE CORPS
OPERATORS
MANUAL
RADIO SET
EE125-JC-OPl-010/PSC3
31R2-2PSC3-1
TM 5895-10/1
AN/PSC-3
(NSN 5820-01-145-4943)
TM11–5895-1180-10
EE125-JC-OPI-01A/PSC3
TO 31R2-2PSC3-1
TM 5898-10/1
Change
AND HEADQUARTERS, MARINE CORPS
No. 1
DEPARTMENTS OF THE ARMY,
THE NAVY, AND THE AIR FORCE
Washington, DC, 15 January 1992
Operator’s Manual
RADIO SET AN/PSC-3
(NSN 5820-01-1454943) (EIC: L2S)
TM 11-5895-1180-10 / EE125-JC-OPI-010/PSC 3/ TO 31R22PSC3-1 / TM 5895-10/1, 15 February 1988, is changed as
follows:
1. Pen and ink change. On front cover, following NSN, add:
(EIC:L2S).
2. Remove old pages and insert new pages as indicated below. New
or changed material is indicated by a vertical bar in the margin of the
page.
Remove pages
i and ii
1-1 and 1-2
2-5 and 2-8
A-1 through A-4
B-1 through B-4
C-1 and C2
3. File this change sheet in front of the manual for reference
purposes.
Distribution authorized to US Government agencies and their
contractors for official use or for administrative or operational
purposes only. This determination was made on 15 June 1991.
Other requests for this document will be referred to Commander,
US Army Communications-Electronics Command and Fort
Monmouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth, New
Jersey 07703-5007.
DESTRUCTION NOTICE - Destroy by any method that will prevent
disclosure of contents or reconstruction of the document.
Insert pages
i and ii
1–1 and 1-2
2-5 and 2-6
A–1 through A-4
B-1 through B-4
C-1 and C–2
By Order of the Secretary of the Army:
Official:
GORDON R. SULLIVAN
MILTON H. HAMILTON
Administrative Assistant to the
Secretary of the Army
00297
By Order of the Marine Corps:
H. E. REESE
Deputy for Support
Marine Corps Research
Development and Acquisition
Command
By Order of the Secretary of the Navy:
ROBERT AILES
Rear Admiral, United States Navy
Command, Space and Naval Warfare
Systems Command
By Order of the Secretary of the Air Force:
LARRY D. WELSH
General, United States Air Force
Chief of Staff
Official:
CHARLES D. McDONALD
General, United States Air Force
Commander, Air Force
Logistics Command
Distribution:
To be distributed in accordance with DA Form 12-51-E,
block 1587, Operator Maintenance requirements for
TM 11-5895-1180-10.
WARNING
ELECTROMAGNETIC RADIATION
Do NOT stand in direct path of the Medium Gain Antenna
when power is on. Do NOT work on cables while power is on.
Transmit antenna cables conduct radio frequency energy that
can cause fatal internal burns and electrical shock. Ensure that
power is off before working on antenna or connectors. If you
feel a slight warming effect while near this equipment, MOVE
AWAY QUICKLY!
CLEANING
Adequate ventilation should be provided while using TRlCHLOROTRIFLUOROETHANE.
vapor should be avoided. The solvent should not be used near
heat or open flame, the products of decomposition are toxic
and irritating.
dissolves natural oils, prolonged contact with skin should be
avoided. When necessary, use gloves which the solvent cannot
penetrate. If the solvent is taken internally, consult a physician
immediately.
Compressed air shall not be used for cleaning purposes except
where reduced to less than 29 pounds per square inch (psi)
and then only with effective chip guarding and personnel
protective equipment. Do not use compressed air to dry parts
when TRICHLOROTRIFLUOROETHANE has been used.
Compressed air is dangerous and can cause serious bodily harm
if protective means or methods are not observed to prevent
chips or particles (of whatever size) from being blown into the
eyes or unbroken skin of the operator or other personnel.
Since TRICHLOROTRIFLUOROETHANE
Prolonged breathing of
BLACKOUT
When operating Radio Set AN/PSC-3 in enemy territory, bright
lights will make it easy for the enemy to detect your presence.
Use blackout procedures to prevent detection by the enemy.
A
SAFETY STEPS TO FOLLOW IF
SOMEONE IS THE VICTIM OF
ELECTRICAL SHOCK
DO NOT TRY TO PULL OR GRAB THE
INDIVIDUAL
IF POSSIBLE, TURN OFF THE ELECTRICAL
POWER
IF YOU CANNOT TURN OFF THE ELECTRICAL POWER, PULL, PUSH, OR LIFT
THE PERSON TO SAFETY USING A DRY
WOODEN POLE OR A DRY ROPE OR
SOME OTHER INSULATING MATERIAL
SEND FOR HELP AS SOON AS POSSIBLE
AFTER THE INJURED PERSON IS FREE
OF CONTACT WITH THE SOURCE OF
ELECTRICAL SHOCK, MOVE THE PERSON
A SHORT DISTANCE AWAY AND
IMMEDIATELY START ARTIFICIAL
RESUSCITATION
B
HIGH VOLTAGE
is used in the operation of this equipment
DEATH ON CONTACT
may result if personnel fail to observe safety precautions.
Never 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. When technicians are aided by operators. they must be
warned about dangerous areas.
Whenever possible, the power supply to the equipment must be
shut off before beginning work on the equipment. Take particular care to ground every capacitor likely to hold a dangerous
potential. When working inside the equipment, after the power
has been turned off, always ground every part before touching
it.
Be careful not to contact high-voltage connections or 115 volt
ac input connections when installing or operating this equipment.
Whenever the nature of the operation permits, keep one hand
away from the equipment to reduce the hazard of current
flowing through the body.
WARNING:
DO NOT BE MISLED BY THE TERM “LOW
VOLTAGE.” POTENTIALS AS LOW AS 50
VOLTS MAY CAUSE DEATH UNDER
ADVERSE CONDITIONS.
For Artificial Respiration, refer to FM 21-11.
c
WARNING
A lithium-sulfur dioxide (Li-SO2) battery used with the
RT-1402A/G contains pressurized sulfur dioxide (SO2) gas. The
gas is toxic, and the battery MUST NOT be abused in any way
which may cause the battery to rupture.
Do not heat, short circuit, crush, puncture, mutilate, or
disassemble batteries.
Do not use any battery which shows signs of damage, such
as bulging, swelling, disfigurement, brown liquid in the plastic
wrap, a swollen plastic wrap, etc.
Do not test Li-SO2 batteries for capacity,
Do not recharge Li-SO2 batteries.
Do not use water to extinguish Li-SO2 battery fires if a shock
hazard exists due to high voltage electrical equipment in the
immediate vicinity (i.e., greater than 30 volts, alternating
current (ac) or direct current (dc)).
If the battery compartment becomes hot to the touch, if
you hear a hissing sound (i.e., battery venting), or smell
irritating sulfur dioxide gas, IMMEDIATELY turn OFF the
equipment. Remove the equipment to a well ventilated
area or leave the area.
Do not use a HaIon type fire extinguisher on a lithium battery
fire.
In the event of a fire, near a lithium battery(ies), rapid cooling
of the battery(ies) is important. Use a carbon dioxide (CO2)
extinguisher. Control of the equipment fire, and cooling, may
prevent the battery from venting and potentially exposing
lithium metal. In the event that lithium metal becomes
involved in fire, the use of a graphite based Class D fire
extinguisher is recommended, such as Lith-X or MET-L-X,
Do not store lithium batteries with other hazardous materials
and keep them away from open flame or heat.
D
-
.
TM 11-5895-1180-10
Technical Manual
No. 11-5895-1180-10
Technical Manual
No. EE125-JC-OPI-01A/PSC3
Technical Order
No. 31R2-2PSC3-1
Technical Manual
. No. 5895-10/1
OPERATOR’S MANUAL
RADIO SET AN/PSC-3
(NSN 5820-01-145-4943) (EIC:L2S)
EE125-JC-OPl-01A/PSC-3
DEPARTMENTS OF THE ARMY,
THE NAVY, THE AIR FORCE,
AND HEADQUARTERS,
Washington, DC, 15 February 1988
31R2-2PSC3-1
TM 5895-10/1
MARINE CORPS
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 our letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms),
or DA Form 2028-2, direct to: Commander, US Army
Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth, New
Jersey 07703-5007.
For Air Force, submit AFTO Form 22 (Technical Order
System Publication Improvement Report and Reply) in
accordance with paragraph 6-5, Section VI, T.O.
00-5-1. Forward direct to prime ALC/MST.
For Navy, mail comments to the Commander, Space and
Naval Warfare Systems Command, ATTN:
PAWAR
S
8122, Washington, DC, 20363-5100.
Marine Corps units, submit NAVMC 10772 (Recom-
mended Changes to Technical Publications) to: Commanding General, Marine Corps Logistics Base (Code
850), Albany, Georgia 31704-5000.
In any case a reply will be furnished direct to you.
Change 1 i
PAGE
HOW TO USE THIS MANUAL
CHAPTER 1. INTRODUCTION . . . . . . . 1-1
Section I. General Information . . 1-1
Section II. Equipment Description and Data]. 1-6
Section III. Technical Principles of Operation . 1-17
CHAPTER 2.
OPERATING INSTRUCTIONS
. . . . . . 2-1
ii
Section I.
CHAPTER 3. MAINTENANCE INSTRUCTIONS
Description and Use of Operator
. . .
Preventive Maintenance Checks and
II.
. . .
III.
Operation Under Usual Conditions . .
IV. Operation Under Unusual Conditions
. . .
. . .2-72
. . . . 3-1
2-1
2-10
2-16
Section I. Troubleshooting Procedures . . . . . . . . 3-1
II. Maintenance Procedures . . . . . . . . . . . 3-6
APPENDIX A.
REFERENCES . . . . . . . . . . . . . .A-1
B.
COMPONENTS OF END ITEM
AND BASIC ISSUE ITEMS LISTS . . . B-1
ADDITIONAL AUTHORIZATION
c.
LIST . . . . . . . . . . . . . . . . . . . .C-1
D.
EXPENDABLE SUPPLIES AND
MATERIALS LIST . . . . . . . . . . . D-1
HOW TO USE THIS MANUAL
This manual is divided into three chapters.
● CHAPTER 1 contains an
introduction to this manual
with functional and physical description of Radio Set
AN/PSC-3. Full view illustrations are provided to assist you
in major component identification.
ii
. CHAPTER 2 contains the description and use of operator
controls with supporting illustrations, instructions for
operation under usual and unusual conditions, and a table
of preventive maintenance checks and senvices.
. CHAPTER 3 contains maintenance data. It provides
operator troubleshooting procedures, maintenance procedures, and operator maintenance limitations for Radio Set
AN/PSC-3.
Pages are numbered consecutively throughout the manual.
.
Each chapter is divided into sections and sections into para-
graphs. Certain section titles are boxed on the front cover. At
the right edge of each box is a blackened area. This blackened
area matches a black mark appearing on the first page of that
section in the manual.
iii
1-0
RADIO SET AN/PSC-3 COMPONENTS
CHAPTER 1
INTRODUCTION
PAGE
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...1-1
Equipment Description and Data.. . . . . . . . . . . . . . . . . . . . . ...1-6
Technical Principles of Operation. . . . . . . . . . . . . . . . . . . . . ..1–17
Section I
GENERAL INFORMATION
1-1. SCOPE
This manual is for your use in operating Radio Set AN/PSC-3. In
addition to detailed operating procedures, the manual will assist
you in setting up for Iine-of-sight (LOS), satellite relay (SAT) and
retransmit (XMT) operation. twill also provide you with operator
maintenance.
1-2. 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 736-750, as
contained in Maintenance Management Update. Air Force ersonnel will use AFR 66-1 for maintenance reporting and TO00-35D54 for unsatisfactory equipment reporting. Navy personnel will report maintenance performed utilizing the Maintenance
Data Collection Subsystem (MDCS) IAW OPNAVINST 4790.2,
Vol 3 and unsatisfactory material/conditions (UR submissions)
IAW OPNAVINST 4790.2, Vol 2, chapter 17. Marine Corps maintains forms and procedures as prescribed byTM 4700-15/1.
Change 1 1–1
b. Report of Packaging and Handling Deficiencies. Fill out and
forward SF 364 (Report of Discrepancy (ROD)) as prescribed in
AR 735-11-2/DLAR 4140.55/SECNAVlNST 4355.18/AFR
400-54/MCO4430.3J.
c. Transportation Discrepancy Report (TDF) (SF 361). Fill out
and forward Transportation Discrepancy Report (TDR) (SF 361)
as prescribed in AR 55–38/NAVSUPlNST 4610.33C/AFR
75–18/MCOP4610.19D/DLAR 4500.15.
1-3. HAND RECEIPT (-HR) MANUALS
This manual has a companion document with a TM number followed by “-HR” (which stands for Hand Receipt). The TM
11-5895-1180-1 0-HR consists of preprinted hand receipts (DA
Form 2062) that list end item related equipment (i.e., COEI, Bll,
and AAL) 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.
1-4. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)
a. Army. If your AN/PSC-3 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 Iike the design or performance. Put it on an SF 368 (Product
Quality Deficiency Report). Mail it to: Commander, US Army
Communications-Electronics Command and Fort Monmouth,
ATTN:
AMSEL-ED–PH, Fort Monmouth, New Jersey
07703-5007. We’ll send you a reply.
b. Air Force. Air Force Personnel are encouraged to submit
ElR’s in accordance with AFR 900-4.
c. Navy. Navy personnel are encouraged to submit ElR’s
through their Iocal beneficial Suggestion Program.
d. Marine Corps Users. QDR shall be reported on SF 368 in ac-
cordance with MCO 1650.17, Quality Deficiency Report Manual.
Submit to Commanding General, Marine Corps Logistics Base
(Code 856), Albany, Georgia 31704-5000.
1–2 Change 1
1-5. NOMENCLATURE CROSS-REFERENCE LIST
The following list should help you locate the official nomenclature of compone
nts of/or equipment used with Radio Set
AN/PSC-3. Official nomenclature must be used when
completing report forms or when looking up technical
manuals.
COMMON NAME
ALICE Pack
OFFICIAL NOMENCLATURE
All-Purpose Lightweight Individual
Carrying Equipment
Backpack Radio Set
Battery Box
DMDG
Radio Set AN/PSC-3
Battery Box CY-8006/PSC-3
Digital Message Device Group
OA-8990/P
Handset
Handset H-250( )/U
Medium Gain
Antenna
Antenna AS-3567/G
Net Control Station
or NCS
-
R/T Unit
RXMT Cable
Whip Antenna
Radio Set AN/VSC-7
Receiver/Transmitter RT-1402A/G
Retransmission Cable MK-456/GRC
Antenna AS-3566/G
1-6. LIST OF ABBREVIATIONS AND ACRONYMS
A complete list of all abbreviations and acronyms used in this
manual are listed below.
ANT
bps
BPSK
CAL
CON
cc w
CT
cw
dB
DBPSK
Antenna
bits per second
Bi-Phase Shift Keying
Call
Conference
counterclockwise
Cipher Text
clockwise
Decibel
Differential Coding Bi-Phase Shift Keying
1-3
LIST OF ABBREVIATIONS AND ACRONYMS (cont)
dc
FM
FM-FSK
Hz
kbps
kHz
LOS
MHz
Ni-Cad
PMCS
PSK
PTT
RCV or
REC
RF
RXMT
SAT
SEL
UHF
U/M
v
VSWR
XMIT or
XMT
XMTR
1-7. GLOSSARY
ALPHANUMERIC - A set of characters containing both letters,
numbers and other symbols.
AMP-HOUR - Ampere-hour is a current of one ampere flowing
for one hour.
AUDIO - Frequencies that are heard.
BANDWIDTH - The difference in hertz between the highest
and lowest frequency required for adequate signal transmission.
BURST MODE - Used in DATA mode. Transmitting or receiving data traffic at a high rate of speed in short bursts.
1-4
direct current
Frequency Modulation
Frequency Modulation - Frequency Shift Keying
Hertz
kilo bits per second
kilo Hertz
Line-of-Sight
Mega Hertz
Nickel-Cadmium Cell
Preventive Maintenance Checks and Services
Phase Shift Keying
Push To Talk
Receive
Radio Frequency
Retransmit
Satellite Relay
Selective
Ultra High Frequency
Unit of Measure
Volts
Voltage Standing Wave Ratio
Transmit
Transmitter
CHANNEL SPACING - The Frequency band in hertz between
two channels.
DETUNE - To change the inductance and/or capacitance of a
tuned circuit, causing it to be resonant at other than the
desired frequency.
ENCRYPTION - To convert from ordinary language into ci-
pher or code.
INTERFACE - Connecting and making two pieces of equip-
ment compatible.
JAMMING Transmitted signals intended to interfere with the
reception of signals from another station.
LINE-OF-SIGHT (LOS) - A straight line between communica-
tion networks.
OMNIDIRECTIONAL - All directional, not favoring any one
direction.
RETRANSMIT (RXMT) - The transmission of information
received from a previous transmission.
SAT OFFSET - The transmitter of a transceiver transmitting
on one frequency while the receiver is receiving on a different
preset offset frequency. The offset frequency is referenced to
the transmit (dial) frequency of Radio Set AN/PSC-3.
EXAMPLE: Dial Frequency is 305.265 MHz, selected off-
set is 30.750 MHz, actual receive for the
selected offset is 305.265 - 30.750 = 274.515
MHz.
SATELLITE RELAY (SAT) - A signal transmitted to a satellite
relay station at one frequency with the satellite relay station
retransmitting the same data to distant stations. The satellite
transmitted signal will be at a different frequency than the fre-
quency received by the satellite.
1-5
Section II
EQUIPMENT DESCRIPTION AND DATA
1-8. PURPOSE
Radio Set AN/PSC-3 is a portable, battery operated, half dup
Iex UHF transceiver. It provides two-way voice (secure and
plain) and data communication via satellite relay (SAT) or lineof-sight (LOS) modes. It operates in the UHF frequency band
of 225 MHz to 399.995 MHz range. Radio Set AN/PSC-3 is
hereinafter referred to as the Backpack Radio Set. One operator is required to crew and operate it. For mobile operation it
is harnessed to the back of the operator. For at halt operation,
it is ground positioned by the operator.
Performance margins permit the use of an omnidirectional low-
gain whip antenna for reception of selective and/or conference
calls from a satellite relay station and for reception and trans-
mission of LOS signals. A directional, medium gain, tripod
mounted antenna is used for SAT operation.
Retransmit (RXMT) operation is possible using Radio Set
AN/PRC-70, Radio Set AN/PRC-77 or Radio Set AN/V RC-12
series with Retransmission Cable MK-456/GRC. The equip-
ment must be separated 25 to 100 feet to prevent interference.
1-9. CAPABILITIES AND FEATURES
a.
The receiver portion and transmitter portion of the
R/T Unit each operate over the identical UHF frequency range of 225 to 399.995 MHz.
b.
Transmitter Output:
● 27.8 Watts in SAT mode of operation with a
medium gain antenna deployed.
● 2 Watts in LOS mode of operation with the low-
gain whip antenna deployed.
1-6
c.
Channel Spacing:
● 5 kHz increments for SAT mode of operation.
● 25 kHz increments for LOS mode of operation.
d. It is capable of receiving and transmitting in any one
of the following modes in both SAT or LOS mode of
operation.
● VOICE - Plain voice audio is standard analog FM
using Handset H-250( )/U. This mode will allow
direct communication with other types of UHF
radios particularly the AN/WSC-3(VI), PRT25067, and AN/URC-101.
● X modes -
It will interface with either the TSEC/
KY-57 or TSEC/KY-65 security devices:
-X1 - TSEC/KY-65 for standard analog FM secure
voice operation.
-X2 - TSEC/KY-57 for 16 kbps (FM-FSK) wideband digital secure voice or TSEC/KY-57 standard
analog FM plain voice in PT or OFF positions of
TSEC/KY-57.
● RXMT - Retransmit mode is either plain voice or
TSEC/KY-65 secure voice standard analog FM. Retransmit mode is compatible with Radio Sets AN/
PRC-70, AN/PRC-77 and AN/VRC-12 series when
using Retransmission Cable MK-456/GRC.
NOTE
CALL mode operation is a unique calling function. It allows
the sending station to alert a distant unit with a visual white
flag indication, and if desired, a five second audible alarm.
● CALL - It will receive conference calls and one of
15 individual selective calls or transmit conference
calls. BPSK modulation is used in both transmit
and receive modes.
1-7
● DATA - It will interface with Digital Message
Device Group OA-8990/P at 300/1200 bps. The
2400 mode will interface with other MIL-STD188C low level data devices at 2400 bps.
1-10. LOCATION AND DESCRIPTION OF MAJOR
COMPONENTS
The Backpack Radio Set can be configured for the
a.
SAT or LOS mode. The major components for SAT
mode are Receiver/Transmitter RT-1402A/G, Battery
Box CY-8006/PSC-3, and Antenna AS-3567/G. The
primary components for operation are keyed in the
following illustration.
SAT CONFIGURATION – MAJOR COMPONENTS
1-8
1-9
b.
The Backpack Radio Set can be configured for the
LOS mode. The major components for LOS configuration are the R/T Unit, Battery Box, and Antenna
AS-3566/G. The primary components necessary for
operation are keyed in the following illustration.
1-10
d.
Tactical Speech Security Equipment TSEC/KY-65. An
analog voice frequency system which provides half duplex, tactical secure voice communications when
used with compatible radio sets, integrated wire/
multichannel radio systems or tactical/commercial
wireline systems.
Radio Set AN/PRC-77. A short-range, 920 channel,
e.
manpack, FM communication equipment, operating in
the frequency range of 30 to 75.95 MHz inclusive in
increments of 50 kHz.
f.
Radio Set AN/PRC-70. A manpack multimode (FM,
CW, FSK, SSB, AM) communication equipment
operating in the frequency range 2 to 75.9999 MHz.
Radio Set AN/VRC-12 series. A vehicular, medium
g.
range, two-way radio-telephone communications set
operating in the 30 to 75.95 MHz frequency range.
Power Supply PP-6148/U. Used to charge Ni-Cad 24
h.
volt batteries or to power the Backpack Radio Set.
The power supply provides a nominal output voltage
of either 14 V dc or 28 V dc, at currents up to 10
amperes, where available ac power is either 115 V or
230 V single phase 50, 60 or 400 Hz. The output
voltage is continuously adjustable within a range of
approximately 12 to 16 V dc or 24 to 32 V dc
according to the nominal voltage selected. Output
current limiting is selectable in five ranges from 0.5 to
10.0 amperes, and is adjustable within the four ranges
from 0.5 to 8.0 amperes.
i.
Generator, Direct Current G-76/G. The dc generator
is a portable hand-cranked electrical generator with
accessories to provide power to military radios, coding
equipment, rechargeable batteries, and other electronic
equipment in the field.
Digital Message Device Group OA-8990/P. Referred to
j.
hereinafter as the DMDG is a handheld, self-contained
unit providing a means to enter and retrieve digital
alphanumeric information in a free format style.
1-13
1-12. EQUIPMENT INTEROPERABLE WITH THE BACK-
PACK RADIO SET
a.
Satellite Communication Set AN/WSC-3(VI), cornmonly referred to as the Whiskey Three. The Whiskey
Three is a highly flexible, new generation, ship/submarine UHF (225 to 399.995 MHz) SAT/LOS communications terminal which sends and receives AM/
FM or data information. The Whiskey Three has a
minimum of 100 watts output in FM or data modes. It
features internal modulation and detection for 75 bps
FSK or 75 bps to 9600 bps PSK. A 70 MHz interface
capability is provided for expansion with a variety of
external modems.
Radio Set AN/VSC-7. Referred to hereinafter as the
b.
Net Control Station or NCS is described in paragraph
1-1 lb, page 1-12.
Radio Set PRT-250B7. A portable satellite AM and
c.
FM communication system consisting of a transceiver,
control unit, battery pack, VHF and UHF antenna,
and a handset which provides the primary link be-
tween the operator and the radio set. The transceiver
operates in the 116 to 150 MHz VHF band and 225 to
399.995 MHz UHF band, tunable in 25 kHz incre-
ments. The transmitter portion delivers 20 or 5 watts
in the UHF band. The set is designed for manpack,
vehicular and aircraft application, and has the TSEC/
KY-65 and TSEC/KY-57 interface capability for
secure operation. The PRT-250B7 is interoperable
with the Backpack Radio Sat in VOICE, X MODE,
and RXMT modes only.
1-14
LOS CONFIGURATION - MAJOR COMPONENTS
1-11
1-11. EQUIPMENT USED IN CONJUNCTION WITH THE
BACKPACK RADIO SET
All-Purpose Lightweight Individual Carrying Equip-
a.
ment. This carrying equipment will hereinafter be
referred to as the ALICE Pack. The Backpack Radio
Set (R/T Unit with Battery Box attached) will be
placed in the inside pocket of the large combat field
pack. Detailed information for the ALICE Pack can be
obtained from Field Manual FM 21-15. The ALICE
Pack is an Additional Authorization List (AAL) item.
b.
Control-Converter C-11119A/VSC-7. Referred to hereinafter as NCS Applique, is a one-piece assembly that
provides base stat ion capabilities when interfaced with
the Backpack Radio Set R/T Unit to configure Radio
Set AN/VSC-7. In addition to providing the physical
mount, the NCS Applique also provides:
● Input power conditioning
● 27.8 watt output
● Automatic T/R changeover
● Transmit and receive selective calling
● EMI protection against other nearby transmitters
● Continuous keydown operation
The NCS Applique permits the R/T Unit to be
powered by the vehicular power system in use, i.e.,
+24 V in a vehicle or 110/220 V at 50/60 cycles in a
communications shelter.
Tactical Speech Security Equipment TSEC/KY-57.
c.
A small, lightweight, manpack, battery operated, wideband secure voice digital communications equipment
designed for use with FM and AM and VHF and UHF
radio communications and wireline systems.
It is a
half-duplex, push-to-talk equipment operating at a
16,000 bits per second (bps) rate. The battery and
battery case (Z-A1J) may be replaced by an HYP-57
Vehicular Power Supply and be operated in a vehicular
configuration with appropriate installation kit.
1-12
1-13. EQUIPMENT DATA
1-15
1-16
TECHNICAL DATA
Section III
TECHNICAL PRINCIPLES OF OPERATION
1-14. GENERAL
The following paragraphs describe the basic principles of operation of the Backpack Radio Set. The LOS mode of operation
is discussed first. SAT mode of operation and RX MT operation are illustrated and will be discussed separately.
1-15. LOS MODE OF OPERATION
LOS mode of operation allows the Backpack Radio Set to be
transported by one person on foot or in a vehicle. With an assigned monitoring frequency (according to operation requirements) for LOS mode, you may continue in motion with the
R/T Unit in a condition to receive a selective or conference
calling signal. The reception of a selective calling signal will
execute a SEL CAL white flag and a five second 1 kHz contin-
uous audible alarm. Reception of a conference calling signal
will execute a CON CAL white flag and a 1 kHz audible alarm
switched on and off at a 1 Hz rate of five seconds. In LOS
mode, the R/T Unit will transmit and receive on the frequency
appearing in the FREQUENCY display. A basic LOS transmis-
sion scheme as illustrated consists of the following:
1-17
1-16. RXMT OPERATION
1-18
Loading...