AN-GRC-106A_user_TM11-5820-520

AN-GRC-106A_user_TM11-5820-520
TM
OPERATOR'S
11-5820-520-10
MANUAL
PAGE 1-3
PAGE 2-1
PAGE 2-16
PAGE 2-21
PAGE 3-2
This copy is a reprint which includes current
pages from Change 1.
RADIO
SETS
AN/GRC-106
(NSN
5820-00-402-2263)
AN/GRC-106A
(NSN
HEADQUARTERS,
28
5820-00223-7548)
DEPARTMENT
MAY
1984
OF
THE
ARMY
TM11-5820-520-10
DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT
Voltages as high as 128 volts ac, 3,000 volts dc, and 10,000 volts RF are
used in the operation of Amplifier, Radio Frequency AM-3349/GRC-106.
DANGEROUS VOLTAGES EXIST AT THE AM-3349/GRC-106
50-OHM LINE AND WHIP ANTENNA CONNECTORS
Be careful when working around the antenna or antenna connectors. Radiofrequency voltages as high as 10,000 volts exist at these points. Operator
and maintenance personnel should be familiar with the requirements of
TB SIG 291 before attempting installation or operation of Radio Set
AN/GRC-106(*).
DEATH ON CONTACT
May result if operating personnel fail to observe safety precautions and
fail to follow requirements of TB SIG 291.
DON’T TAKE CHANCES
WARNING
Adequate ventilation should be provided while using T R I C H L O R O T R I F L U O R O -
ETHANE. Prolonged breathing of vapor should be avoided. The solvent should
not be used near heat or open flame; the products of decomposition are toxic
and irritating. Since TRICHLOROTRIFLUOROETHANE 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.
TM 11-5820-529-10
C1
Change
HEADQUARTERS
DEPARTMENT OF THE ARMY
Washington, DC, 15 May 1989
No. 1
OPERATOR’S MANUAL
RADIO SETS
AN/GRC-106
(NSN 5820-00-402-2263)
AN/GRC-106A
(NSN 5820-00-223-7548)
TM 11-5820-520-10, 28 May 1984 is changed as follows:
1. 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. Revised illustrations
are indicated by a miniature pointing hand adjacent to the changed area.
Remove pages
Insert pages
a and c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a through d
band d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .None
i and ii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i and ii
1-1 through 1-4 . . . . . . . . . . . . . . . . . . . . . . . . .1-1 through 1-4
1-7 and 1-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 and 1-8
2-9 and 2-10 . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9 and 2-10
2-15 through 2-20 . . . . . . . . . . . . . . . . . . . . . . . 2-15 through 2-20
2-23 through 2-26 . . . . . . . . . . . . . . . . . . . . . . . 2-23 through 2-26
2-29 and 2-30 . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29 and 2-30
2-33 through 2-40 . . . . . . . . . . . . . . . . . . . . . . . 2-33 through 2-40
2-45 and 2-46 . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45 and 2-46
3-3 and 3-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 and 3-4
A-1 and A-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 and A-2
B-5 through B-7/(B-8 blank) . . . . . . . . . . . . . B-5 through B-7/(B-8 blank)
2. File this change sheet in front of the publication for reference purposes.
Distribution authorized to the Department of Defense and DOD contractors only
for official use or for administration or operational purposes. This determination
was made on 9 February 1989. Other requests for this document will be
referred to Commander, US Army Communications-Electronics Command and
Fort Monmouth, ATTN: AMSEL-LC-ME-P, Fort Monmouth, NJ 07703-5000.
DESTRUCTION NOTICE – Destroy by any method that will prevent disclosure of
contents or reconstruction of the document.
TM11-5820-520-10
WARNING
RADIOACTIVE MATERIAL
CONTROLLED DISPOSAL REQUIRED
ACCOUNTABILITY NOT REQUIRED
STD RW-2
Meter, electrical indicating . . . . Ra226 . . . . . . 1.0uCi . . . . 6625-01-226-5681
Meter, electrical indicating . . . . Ra226 . . . . . . 1.0uCi . . . . 6625-00-226-5679
Meter, signal level . . . . . . . . . .Ra226 . . . . . . 0.6uCi . . . . 6625-00-226-5680
Radiation Information: The following radiation information must be read
and understood by all personnel before operating or repairing Radio Sets
AN/GRC-106 and AN/GRC-106A. Radioactive materials are present in the
above listed components of the AM-3349/GRC-106 and the RT-662/GRC.
The components are potentially hazardous when broken. See qualified
medical personnel and the local Radiological Protection Officer (RPO)
immediately, if you are exposed to or cut by broken components. First aid
instructions are contained in TB 43-0116 and TB 43-0122.
NEVER place radioactive components in your pocket.
Use extreme care NOT to break radioactive components while handling them.
NEVER remove radioactive components from cartons until you are ready to
use them.
If any of these components are broken, notify the local RPO immediately.
The RPO will survey the immediate area for radiological contamination and
will supervise the removal of broken components.
The above listed radioactive components will NOT be repaired or disassembled.
a
TM11-5820-520-10
FIXED OPERATION WITH LONG RANGE ANTENNAS
WARNING
NEVER ERECT THESE LONG RANGE ANTENNAS DIRECTLY UNDER POWER LINES.
IF YOU MUST ERECT THESE LONG RANGE ANTENNAS NEAR POWER LINES, POWERLINE POLES OR
TOWERS, OR BUILDINGS WITH OVERHEAD POWERLINE CONNECTIONS, NEVER PUT THE ANTENNA
CLOSER THAN TWO TIMES THE ANTENNA HEIGHT FROM THE BASE OF THE POWER LINE, POLE,
TOWER OR BUILDINGS, 100 FEET AWAY IS A GOOD SAFE ROUND NUMBER TO REMEMBER.
NEVER ATTEMPT TO ERECT ANY LONG RANGE ANTENNA WITHOUT A FULL TEAM.
BEFORE ERECTING ANY LONG RANGE ANTENNA, INSPECT ALL THE PARTS MAKING UP THE
ANTENNA KIT. DO NOT ERECT THE ANTENNA IF ANY PARTS ARE MISSING OR DAMAGED.
DO AS MUCH OF THE ASSEMBLY WORK AS POSSIBLE ON THE GROUND.
WHEN ERECTING THE ANTENNA, ALLOW ONLY TEAM PERSONNEL IN THE ERECTION AREA.
MAKE SURE THAT THE AREA FOR THE ANCHORS IS FIRM. IF THE GROUND IS MARSHY OR SANDY,
GET SPECIFIC INSTRUCTIONS FROM YOUR CREW CHIEF OR SUPERVISOR ON HOW TO REINFORCE
THE ANCHORS.
WHEN SELECTING LOCATIONS FOR ANCHORS, AVOID TRAVELED AREAS AND ROADS. IF YOU CANNOT
AVOID THESE AREAS, GET SPECIFIC INSTRUCTIONS FROM YOUR SUPERVISOR AS TO WHAT CLEARANCE YOUR GUY WlRES AND ROPES MUST HAVE OVER THE TRAVELED AREAS AND ROAD.
CLEARLY MARK ALL GUY WIRES AND ROPES WITH THE WARNING FLAGS OR SIGNS SUPPLIED BY YOUR
UNIT. IN AN EMERGENCY, USE STRIPS OF WHITE CLOTH AS WARNING STREAMERS.
IF YOU SUSPECT THAT POWERLINES HAVE MADE ACCIDENTAL CONTACT WITH YOUR ANTENNA, STOP
OPERATING, ROPE OFF THE ANTENNA AREA, AND NOTIFY YOUR SUPERIORS.
IF THE WEATHER IN YOUR AREA CAN CAUSE ICE TO FORM ON YOUR LONG RANGE ANTENNA AND ITS
GUY WIRES AND ROPES, ADD EXTRA GUYS TO SUPPORT THE SYSTEM. ROPE OFF THE AREA AND
POST IT WITH WARNING SIGNS LIKE BEWARE OF FALLING ICE.
DO NOT TRY TO ERECT ANY ANTENNA DURING AN ELECTRICAL STORM.
KEEP A SHARP EYE ON YOUR ANCHORS AND GUYS.
BEFORE AND AFTER BAD WEATHER.
b
Change 1
CHECK THEM DAILY AND lMMEDIATELY
TM 11-5820-520-10
WARNING
SERIOUS INJURY OR EVEN DEATH CAN HAPPEN IF THE FOLLOWING
ARE NOT CAREFULLY OBSERVED WHEN INSTALLING AND USING
THE ANTENNAS USED WITH YOUR RADIO SETS.
1. ARE THERE ANY POWERLINES IN YOUR AREA OF OPERATION ?
2. HOW HIGH ARE THESE POWERLINES ?
3. HOW TALL ARE THE POLES OR TOWERS CARRYING POWERLINES ?
MOBILE OPERATION WITH WHIP ANTENNAS
DO NOT STOP YOUR VEHICLE UNDER POWER LINES.
●
●
●
IF POSSIBLE, TRY TO MAINTAIN MOBILE COMMUNICATIONS WITH
YOUR ANTENNA(S) TIED DOWN.
MAKE SURE AN ANTENNA TIP CAP IS SECURELY TAPED ON THE
END OF EACH WHIP ANTENNA.
DO NOT LEAN AGAINST OR TOUCH A WHIP ANTENNA WHILE THE
TRANSMITTER IS ON.
●
DURING CROSS-COUNTRY OPERATION, DO NOT ALLOW ANYONE
TO STICK AN ARM, LEG OR WEAPON OVER THE SIDES OF THE
VEHICLE.
IF YOUR ANTENNA ACCIDENTALLY TOUCHES A
POWERLINE AND A LEG, ARM OR WEAPON CONTACTS A DAMP
BUSH OR THE GROUND, A SERIOUS OR FATAL ACCIDENT CAN
HAPPEN.
●
IF YOU ARE NOT SURE THAT AN ANTENNA ON YOUR VEHICLE
WILL CLEAR A POWERLINE, STOP BEFORE YOU GET CLOSE
TO THE POWERLINE AND EITHER CAREFULLY TIE DOWN THE
ANTENNA OR REMOVE ANTENNA SECTIONS TO MAKE SURE
THAT YOU CAN SAFELY DRIVE UNDER THE POWERLINE.
Change 1
c
TM11-5820-520-10
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
d
Change 1
*TM11-5820-520-10
Technical Manual
No. 11-5820-520-10
HEADQUARTERS
DEPARTMENT OF THE ARMY
Washington, DC, 28 May 1984
OPERATOR’S MANUAL
RADIO SETS
AN/GRC-106 (NSN 5820-00-402-2263)
AND
AN/GRC-106A (NSN 5820-00-223-7548)
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 or DA Form 2028 (Recommended Changes to Publications and Blank
Forms) direct to: Commander, US Army Communications-Electronics
Command and Fort Monmouth, ATTN: AMSEL-LC-ME-PS, Fort Monmouth,
New Jersey 07703-5000. In either case, a reply will be furnished direct
to you.
SUBJECT
CHAPTER 1
Section I
PAGE
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Consolidated Index of Army Publications
and Blank Forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Maintenance Forms, Records and Reports . . . . . . . . . . . . . . . . . . 1-1
Administrative Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1
Destruction of Army Electronics Materiel . . . . . . . . . . . . . . . . . 1-1
Reporting Equipment Improvement
Recommendations (EIR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Nomenclature Cross Reference List . . . . . . . . . . . . . . . . . . . . . 1-2
List of Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Hand Receipt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2
Section II Equipment Description . . . . . . . . . . . . . . . . . . . . . . . . .
. . 1-3
Equipment Purpose, Capabilities and Features . . . . . . . . . . . . 1-3
Description of Major Components . . . . . . . . . . . . . . . . . . . . . . . 1-3
Antenna Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-4
Differences Between Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 -7
Section Ill Technical Principles of Operation . . . . . . . . . . . . . . . . . . . . 1-9
*This manual supersedes TM 11-5820-520-10, 23 November 1982.
i
TM11-5820-520-10
PAGE
SUBJECT
CHAPTER 2
Section I
Section II
OPERATING INSTRUCTIONS . . . . . . . . . .
2-0
Description and Use of Operator’s
Control and Indicators . . . . . . . . . . . . .
2-1
Preventive Maintenance Checks and
Services (PMCS) . . . . . . . . . . . . . . . . .
PMCS Procedures . . . . . . . . . . . . . . . . . . . .
PMCS Chart . . . . . . . . . . . . . . . . . . . . . . . . .
Section Ill
Operation Under Usual Conditions . . . . .
Assembly and Preparation for Use . . . . . .
Operating Procedures . . . . . . . . . . . . . . . . .
Preparation for Movement . . . . . . . . . . . . .
Section IV
Operation Under Unusual Conditions . . . .
Operation in Unusual Weather . . . . . . .
Jamming and ECM Procedures . . . . . .
Anti-Jamming Procedures . . . . . . . . . .
Destruction to Prevent Enemy Use . . .
.
.
.
.
.
.
.
.
.
.
.
.
2-16
2-20
2-20
2-21
2-21
2-40
2-45
2-46
2-46
2-46
2-47
2-48
MAINTENANCE INSTRUCTIONS . . . . . . .
3-0
Troubleshooting Procedures . . . . . . . . . .
3-2
APPENDIX A REFERENCES . . . . . . . . . . . . . . . . . . . .
A-1
APPENDIX B COMPONENTS OF END ITEM LIST . . . . .
B-1
CHAPTER 3
APPENDIX C ADDITIONAL AUTHORIZATION LIST
(NOT APPLICABLE)
APPENDIX D EXPENDABLE SUPPLIES AND MATERIALS
LIST
(NOT APPLICABLE)
ii
GLOSSARY
....................................
Glossary
INDEX
....................................
Index-1
TM 11-5820-520-10
RADIO SET
AN/GRC-106
iii blank/1-0
TM
11-5820-520-10
CHAPTER 1
INTRODUCTION
Section 1. GENERAL
1-1.
SCOPE
This manual is for your use in operating Radio Sets AN/GRC-106 and AN/GRC-106A. It
gives detailed operating instructions, and will tell you how to set up and maintain the
equipment. AN GRC-106(*) will designate both the AN/GRC-106 and AN-GRC-106A.
1-2. CONSOLIDATED INDEX OF ARMY PUBLICATIONS AND BLANK FORMS
Refer to the latest issue of DA Pam 25-30 to determine whether there are new editions,
changes or additional publications pertaining to the equipment.
1-3.
a.
MAINTENANCE FORMS, RECORDS, AND REPORTS
Reports
of
Muintenance
and
Equipment. D e p a r t m e n t
Unsatisfactory
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.
h.
Reporting
of
Item
and
Packaging
Fill
Discrepancies.
(Report of Discrepancy (ROD)) as prescribed
4355.18 AFR 400-54/MCO 4430.3J.
in
AR
out
and
735-11-2/DLAR
c. Transportation Discrepancy Report (TDR) (SF 361). Fill
Transportation
NAVSUPINST
1-4.
Discrepancy
4610.33C/AFR
ADMINISTRATIVE
Report
75-18/MCO
(TDR)
(SF
361)
P4610.19D/DLAR
as
forward
SF
364
4140.55/SECNAVINST
out
prescribed
and
in
forward
AR
55-38/
4500.15.
STORAGE
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.
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. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR)
If your AN/GRC-106 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 k n o w
why you don’t like the design or performance. Put it on an SF 368 (product Quality
Deficiency Report), Mail it to: Commander,
Command
and
Fort
Monmouth,
ATTN:
US Army Communications-Electronics
AMSEL-PA-MA-D, Fort Monmouth, New Jersey
07703-5000. We’ll send you a reply.
Change 1
1-1
TM 11-5820-520-10
1-7.
NOMENCLATURE
CROSS-REFERENCE
LIST
Common names will be used when the major components of the Radio Set are
mentioned in this manual.
COMMON
NAME
NOMENCLATURE
Radio Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RT mount . . . . . . . . . . . . . . . . . . . . . . . . . .
Telegraph Key . . . . . . . . . . . . . . . . . . . . . .
Loudspeaker . . . . . . . . . . . . . . . . . . . . . . . .
Headset . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Handset . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microphone . . . . . . . . . . . . . . . . . . . . . . . .
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
AN/GRC-106(*)
Receiver-Transmitter, Radio
RT-662/GRC or RT-834/GRC
Amplifier, Radio Frequency
AM-3349/GRC-106
Mounting MT-3140/GRC-106
Key, Telegraph KY-116/U
Dynamic Loudspeaker LS-166/U
Headset, Electrical H-227/U
Handset, H-33/(*)PT
Microphone, Carbon M-29B/U
Antenna Group AN/GRA-50
NOTE
If either the RT or Amplifier requires repair turn in both components
1-8.
LIST
OF
ABBREVIATIONS
Abbreviations are spelled out the first time they appear in this manual. A Iist of
abbreviations
commonly
used
in
this
manual
is
provided
below.
Amplitude modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AM
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .ANT
Beat-frequency oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . BFO
Continuous wave . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . CW
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FREQ
Frequency-shift-keyed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FSK
Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GRD
High voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HV
Intermediate frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IF
Kilohertz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . kHz
Megahertz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MHz
Narrow frequency-shift-keyed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . NSK
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PWR
Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PRIM
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RCVR
Single-sideband . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..SSB
Upper-sideband . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . usb
1-9.
HAND
RECEIPT
This manual has a companion document with a TM number followed by
"-HR"(which stands for H and Receipt). TM 11-5820-520-10-HR consists of
preprinted hand receipts (DA Form 2062) that list end item related equipment (i.e., COEl, Bll, and AAL) you must account for. As an aid to property
accountability,
Army
with
1-2
Adjutant
the
additional
General
procedures
Change 1
in
-HR
manuals
Publications
Chapter
3,
maybe
Center,
AR
310-2,
requisitioned
Baltimore,
and
DA
MD,
PAM
in
from
The
US
accordance
310-10.
TM 11-5820-520-10
Section Il. EQUIPMENT DESCRIPTION
1-10. EQUIPMENT PURPOSE, CAPABILITIES, AND FEATURES
Radio Set AN/GRC-106(*) is a high frequency, single-sideband receiving/transmitting set.
It is designed as a mobile radio link in a communications network,
can be mounted on a ¼ ton vehicle, or used as a fixed mobile station.
The Radio Set transmits: Upper-sideband (usb) signals.
Usb compatible amplitude-modulated (AM)
signals.
Continuous Wave (CW) signals.
Frequency-Shift-Keyed (FSK) signals.
Narrow Frequency-Shift-Keyed (NSK)
signals.
The Radio Set receives:
Usb compatible AM signals.
Conventional double-sideband AM signals.
Continuous Wave (CW) signals.
FSK signals.
NSK signals.
1-11.
Radio
DESCRIPTION OF MAJOR COMPONENTS
Set
AN/GRC-106(*)
is
made
up of a receiver/transmitter RT662/GRC or RT-834/GRC, and. . .
● Amplifier AM-3349/GRC-106, which
amplifies signals transmitted
using RT-662/GRC or RT-834/GRC.
● All operator’s controls, meters,
power input and power output connectors are on the front panel.
Loudspeaker LS-166/U reproduces
audio signals.
It has a metal case, with connecting cord, housing speaker, matching transformer, and twoposition output level switch.
Handset H-33(*)/PT is used t o
receive and transmit audio signals.
● It has a plastic case with a
microphone, earphone, and
non-locking push-to-talk switch.
1-3
TM11-5820-520-10
Headset H-227/U reproduces audio
signals.
● It has an adjustable headband and
two cushioned earpieces with two
earphones.
●
Telegraph Key KY-116/U is used
for transmitting Morse Code.
It is a hand keying device with
adjustable metal bank that can
be placed around operator’s upper
leg. It has 4 screws for mechanical
adjustments and 2 other screws for
connection through Cable CX-1852/U,
to Audio on RT-662/GRC.
●
●
Microphone M-29B/U is used when
transmitting voice signals.
It is a hand-held microphone in a
plastic case with a push-to-talk
switch.
1-12. ANTENNA DESCRIPTION
Whip antenna radiates and
receives signals.
It has 5 mast selections and
1 mast base.
Mast cover shields upper
part of mast base and reduces
shock hazard.
Mast cover shields mast
sections and mast base,
reducing shock hazard.
Mast cover kept in place with a
brass antenna sheath clamp.
Doublet antenna radiates
and receives signals.
Antenna tip is attached to
mast section MS-118-A.
Canvas bag CW-206/GR is used to store parts of the whip antenna when
they are not being used.
1-4
● Mounting equipment
MT-3140/GRC-106
TM 11-5820-520-10
is used to stack the amplifier on
top of the RT for vehicular installation.
1-13. DIFFERENCES BETWEEN MODELS
Radio Set AN/GRC-106 uses RT-662/GRC with AM-3349/GRC-106.
RT-662/GRC has 5 tuning controls which can be used to select any
one of 28,000 operating frequencies.
RT-662/GRC tunes in 1-kHz units.
1-5
TM 11-5820-520-10
Radio Set AN/GRC-106A uses RT-834/GRC with AM-3349/GRC-106.
RT-834/GC has 6 tuning controls which can be used to select any
one of 280,000 operating frequencies.
RT-834/GRC tunes in 100-Hz units.
RT-834/GRC
AM-3349/GRC-106
1-6
TM 11-5820-520-10
1-14. PERFORMANCE DATA
WEIGHTS and DIMENSIONS
RT-662/GRC
RT-834/GRC
AM-3349/GRC-106
Height
IN. (CM)
Depth
IN. (CM)
Width
IN. (CM)
7 (17.75)
7 (17.75)
9 (22.8)
13 (33)
13 (33)
13 (33)
18 (45.5)
18 (45.5)
18 (45.5)
Weight
LBS. (KG)
51 (23.5)
46.5 (21)
71.5 (32.3)
RT-662/GRC and RT-834/GRC PERFORMANCE DATA
TYPE OF RECEIVER . . . . . . . . . . . . Superheterodyne with triple conversion.
BANDWIDTH . . . . . . . . . . . . . . . . . .
3.2 kHz.
FREQUENCY RANGE . . . . . . . . . . .
2.0 to 29.999 MHz.
TYPES OF TRANSMISSION . . . . . .
Upper-sideband
Usb compatible AM
Continuous Wave
Frequency-shift-keyed
Narrow Frequency-shift-keyed.
TYPES OF RECEPTION . . . . . . . . . .
Usb signals, usb compatible and conventional double-sideband AM Continuous wave Frequency-shift-keyed
Narrow frequency-shift-keyed.
PRIMARY VOLTAGE . . . . . . . . . . . .
27 volts direct current.
POWER REQUIREMENTS
OVEN ON . . . . . . . . . . . . . . . . . . . . . 16.2 watts to begin; 2.7 watts after warm
up.
STAND BY . . . . . . . . . . . . . . . . . . . .
14 watts average.
SSB NSK . . . . . . . . . . . . . . . . . . . . . .
36 watts average to receive, 45 watts
average to transmit.
FS K . . . . . . . . . . . . . . . . . . . . . . . . .
36 watts average to receive, 45 watts
average to transmit.
AM . . . . . . . . . . . . . . . . . . . . . . . . . . .
36 watts average to receive, 45 watts
average to transmit.
CW . . . . . . . . . . . . . . . . . . . . . . . . . . .
36 watts average to receive, 45 watts
average to transmit.
RF POWER OUTPUT . . . . . . . . . . . .
0.1 watt peak effective power.
1-7
TM 11-5820-520-10
AM-3349/GRC-106 PERFORMANCE DATA
FREQUENCY RANGE . . . . . . . . . . 2.0 to 29.999 MHz.
INPUT IMPEDANCE. . . . . . . . . . . . 50 ohms.
OUTPUT IMPEDANCE. . . . . . . . . .
Output No. 1...50 ohms.
Output No. 2...to match 15 foot whip
antenna.
PRIMARY VOLTAGE . . . . . . . . . . . . 27 volts direct current.
POWER REQUIREMENTS
STAND BY . . . . . . . . . . . . . . . . . . . .
250 watts average.
OPERATE . . . . . . . . . . . . . . . . . . . .
250 watts average.
TRANSMIT TWO-TONE . . . . . . . . . 1,000 watts average.
TRANSMIT VOICE . . . . . . . . . . . . .
800 watts average.
POWER OUTPUT
CW. . . . . . . . . . . . . . . . . . . . . . . . . . .
About 200 watts.
COMPATIBLE AM . . . . . . . . . . . . . .
About 200 watts (with two-tone signal).
SSB VOICE . . . . . . . . . . . . . . . . . . . .
About 200 watts.
FSK OR NSK VOICE . . . . . . . . . . . .
About 200 watts.
NSK . . . . . . . . . . . . . . . . . . . . . . . . . .
About 200 watts.
ANTENNA . . . . . . . . . . . . . . . . . . . . .
15 foot whip or doublet (50 ohms).
EFFECTIVE RANGE . . . . . . . . . . . .
20 miles planning range (ground wave);
80 miles and farther (skywave); depending on terrain, frequency, antenna,
time of day, and atmospheric
conditions.
1-8
TM 11-5820-520-10
Section Ill. TECHNICAL PRINCIPLES OF OPERATION
1-15. TRANSMITTING AND RECEIVING SIGNALS - RADIO SET AN/GRC-106(*)
Voice, cw and code signals are applied to TRANSMITTER PORTION of
RT unit, where they are modulated and converted into a Radio Frequency (RF) signal.
This RF signal is applied to POWER AMPLIFIER PORTION of Amplifier, where
its level is raised to a nominal 400 watts peak envelope power (pep).
It is then applied to ANTENNA COUPLER PORTION, where it is sent through
switching and impedance-matching circuits for transmission. The ANTENNA
COUPLER PORTION matches the 15-FOOT WHIP ANTENNA or ANTENNA
GROUP AN/GRA-50 to POWER AMPLIFIER PORTION to ensure proper power
transfer.
All incoming signals are received by the ANTENNA SWITCHING PORTION of
Amplifier . . .
. . . and applied to RT RECEIVER PORTION.
Usb, usb compatible am, cw and conventional double-sideband am signals
are converted into Intermediate Frequency (IF) signals for monitoring by
HEADSET H-227/U, HANDSET H-33(*)/PT or LOUDSPEAKER LS-166/U.
Fsk or nsk signals are also converted into IF signals and applied to RADIO
TELETYPEWRITER TERMINAL EQUIPMENT for transferal to page printers or
tape punches for message interpretation.
1-9
TM 11-5820-520-10
CHAPTER 2
OPERATING lNSTRUCTIONS
2-0
SUBJECT
PAGE
AM-3349/GRC-106 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Antijamming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly and Preparation for Use . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controls and indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Destruction to Prevent Enemy Use . . . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency Stopping Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation, Unusual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation, Usual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PMCS Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation for Movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radio Jamming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RT-662/GRC and RT-834/GRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Starting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stopping Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To Receive Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To Transmit Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tuning Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warm Up Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-10
2-47
2-21
2-1
2-48
2-44
2-40
2-46
2-21
2-20
2-45
2-16
2-46
2-1
2-32
2-44
2-40
2-41
2-34
2-29
TM 11-5820-520-10
Section I.
2-1.
DESCRIPTION AND USE OF OPERATOR’S CONTROL AND
lNDICATORS
GENERAL
As operator of Radio Set AN/GRC-106(*), you will be working with the
following controls and indicators.
To prevent electrical shocks or damage to the equipment, do not
operate this radio until you understand the operation and function
of all controls, indicators, and connectors.
2-2. RT-662/GRC AND RT-834/GRC
RT-662/GRC
2-1
TM 11-5820-520-10
RT-834/GRC
AM-3349/GRC-106
2-2
TM 11-5820-520-10
2 - 3
TM 11-5820-520-10
2-4
TM 11-5820-520-10
2-5
TM 11-5820-520-10
2-6
TM 11-5820-520-10
2-7
TM 11-5820-520-10
2-8
TM 11-5820-520-10
Change 1 2-9
TM 11-5820-520-10
2-3. AMPLIFIER AM-3349/GRC-106
Be very careful when you are working around these antennas and
antenna connectors. High voltages exist at these points.
WHIP
Lead of 15-foot whip antenna connects here.
50 OHM LINE
Flag switch covers 50
ohm connector.
Connects doublet
antenna.
GRD
● Spring-loaded binding post
for grounding radio set to
vehicle chassis.
2-10
RCVR ANT.
● Receiver antenna connector.
● Connects RCVR ANT. output to
RECEIVER IN input on RT when
radio set is receiving.
TM 11-5820-520-10
2-11
TM 11-5820-520-10
TEST METER and TEST METER selector switch are used
by operator to monitor voltage levels in the amplifier.
2-12
TM 11-5820-520-10
2-13
TM 11-5820-520-10
2-14
TM 11-5820-520-10
Change 1 2-15
TM 11-5820-520-10
Section Il. PREVENTIVE MAINTENANCE CHECKS AND SERVICES
2-4. PREVENTIVE MAINTENANCE
Operator’s Preventive Maintenance Checks and Services (PMCS) is the required daily and weekly inspection and care of your equipment necessary to
keep it in good operating condition.
a. Tools, Materials, and Equipment Required For Maintenance
No tools or equipment are required for operator maintenance.
The following cleaning materials will be useful to the operator:
Lint-free cloths
Soft bristle brush
Dishwashing compound or detergent
Cleaning compound (NSN 6859-00-597-9765)
NOTE
If your radio set must be in USE ALL THE TIME, check
and service those items that can be checked and serviced
without stopping its operation. Make COMPLETE
checks and services ONLY when the radio set is finally
SHUT DOWN.
b. Routine Checks
Routine services are a collection of checks and observations performed by
the operator at all times. Routine services are not listed in the preventive
maintenance checks and services table, in order to separate the nonoperational from the operational services.
You should perform the following routines as necessary.
Clean
Dust
Wash
Check for cut or frayed cables
Check for dented, bent, or broken
components
Check to see that items not in use
are properly stored
Check for rusting
Check controls for smooth operation
Check for completeness and current
changes to publications.
2-16
TM 11-5820-520-10
●
●
●
Cover unused receptacles
Check for loose nuts, bolts, and
connectors
Check that grounds are not
damaged and that connections
are securely attached
Check for completeness of
equipment
Service the following items:
Ž Radio antennas
• Radio equipment
● Transmitter heat exchanger
C.
Explanation of INTERVAL column of PMCS chart
NOTE
Always keep in mind all WARNINGS and CAUTIONS
when PMCS are performed.
Do your Weekly (W), Before Operating (B), After Operating (A), and
Monthly (M) PMCS to insure that the radio set is functioning properly.
NOTE
ALL PMCS must be done as regularly scheduled and
also under the following conditions:
• Before the radio set is used on a mission.
• When the radio set is first installed.
● When the radio set is re-installed after being
removed for any reason.
● When you are operating the radio set for the first
time.
d. Explanation of EQUIPMENT IS NOT READY/AVAILABLE IF:
column of PMCS chart.
●
This column tells the condition under which the equipment
cannot perform the assigned mission requirements.
Change 1
2-17
TM 11-5820-520-10
NOTE
The procedures column in your PMCS chart tells you
how to perform the required checks and services.
Carefully follow these instructions. If tools are needed,
or the chart instructions tell you, get organizational
maintenance to do the necessary work.
NOTE
If any portion of your radio set fails to operate refer to
Chapter 3 under Troubleshooting for possible problems.
Report any malfunctions or failures on the proper DA
Form 2404 or refer to DA Pam 738-750.
DA FORM 2404, EQUIPMENT INSPECTION AND MAINTENANCE WORKSHEET
TM 11-5820-520-10
2-18
Change 1
Table 2-1.
Table 2-1.
Chapter 2
Section III
2-19
TM 11-5820-520-10
Change 1
TM 11-5820-520-10
Table 2-1
2 - 2 0 Change 1
Table 2-1 (con't).
TM 11-5820-520-10
Section Ill. OPERATION UNDER USUAL CONDITIONS
2-6. ASSEMBLY AND PREPARATION FOR USE
a. MOUNTING PROCEDURE
● Grasp the release handles on RT Mount and pull them forward from their
securing holes while turning them toward the outside of the unit.
●
Position RT on RT Mount so that the cleats on the bottom of the RT unit
sit securely in the holes of RT Mount.
NOTE
For installation requiring side-by-side mounting of
the RT and Amplifier, two sets of shorter crossbar
assemblies and another RT Mount would be needed.
2-21
TM 11-5820-520-10
●
Position Amplifier on top of the RT or on a separate RT Mount depending
on the type of installation you are using. Set the cleats on the bottom of
AmpIifi e r into the matching holes on the top of the RT.
●
Position the crossbar assemblies so that they rest against the side of the
unit.
●
Be sure the tension on the crossbar assemblies is correct. Using one of the
1/2-by 9/16-inch open end wrenches supplied with the Tool Kit-101/G, alternately tighten the two adjusting screws on each crossbar assembly until the
respective crossbar is just touching the bottom of the mounting notch.
Tighten each adjusting nut one-quarter turn. If necessary, tighten the Allen
screws in each pivot assembly until a point of resistance is reached.
●
2-22
TM 11-5820-520-10
Grasp the release handles on RT Mount and pull them forward while turning them toward the outside of the unit. Rotate the handles back and push
them into the holes in the front of RT Mount. If the tension is correct, no
binding will occur and the equipment will be secured on RT Mount. If
binding is present, alternately loosen the two adjusting nuts until binding
disappears.
NOTE
Adjusting nuts must always be tight enough
to secure radio.
●
Pull handles and turn them to the outside. If friction is correct the crossbar
assemblies will move away from the set and the handles and crossbars will
stay where they are released.
●
Radio Set AN/GRC-106(*) is now mounted.
NOTE
Crew is authorized use of Tool Kit-101/G in MAC.
NOTE
To install AN/GRC-106(*) into the High Mobility
Multi-Purpose Wheeled Vehicle (HMMWV) use
Installation Kit MK-2506 (NSN 5820-01-208-1905)
with 100A kit (NSN 2920-01-199-2393) for power.
Change 1
2-23
TM 11-5820-520-10
Dangerous voltages exist at the Amplifier 50 OHM LINE
and whip antenna connectors. Be very careful when
working with the antenna and antenna connectors.
b. GROUNDING AN/GRC-106(*)
● Set Amplifier PRIM. PWR. switch and RT SERVICE SELECTOR switch to
OFF.
●
●
2-24
Connect ground cable (bonding jumper) to spring-loaded ground binding
post (GRD) on Amplifier.
Connect lug at end of grounding cable to chassis of vehicle.
TM 11-5820-520-10
c. CONNECTING ANTENNA
● Make sure Amplifier PRIM. PWR. and RT SERVICE SELECTOR switches
are OFF.
NOTE
Check the overhead area to see that there are
no power lines in the immediate area.
●
Assemble a 15-foot whip antenna by screwing together three Mast Sections MS-116A. Then screw Mast Section MS-117A into the top of the
three MS-116A’S just joined. Finally screw Mast Section MS-118A into the
top of MS-117A.
Slide mast antenna cover over the assembled mast sections and screw
into Mast Base AB-652/GR. The Mast Base is mounted to the mast
bracket secured to the vehicle.
Keep antenna cover in place by attaching and carefully tightening antenna sheath clamp. The whip antenna is now assembled and installed.
2-25
TM
11-5820-520-10
●
Connect antenna lead connector to whip antenna terminal on Amplifier.
Use electrical lead CX-10171/U.
NOTE
Before connecting antenna lead check all contacts
for rust or corrosion. Clean all contacts till shiney
and apply a light coating of silicone
(NSN 6850-00-880-7616).
●
2-26
Thread the antenna lead through insulators on left hand crossbar
assembly. Connect the other end to binding post on AB-652/GR.
Amplifier is now grounded and the antenna is connected.
TM 11-5820-520-10
NOTE
To install Antenna Group AN/GRA-50 (Doublet
Antenna), refer to TM 11-5820-467-15. Connect the
AN/GRA-50 radio frequency (rf) transmission cable to
the AM-3349/GRC 50 OHM LINE receptacle.
CAUTION
Before connecting Cable Assembly, Special Purpose,
Electrical CX-10071/U to POWER jack on RT, be sure
both pins C and D on J24 are grounded. If only one pin
has been grounded, the lead between the pin and
ground might not handle the load and burn open. If
measurements indicate that only one pin is grounded,
request a higher category of maintenance to ground the
other pin.
d. TYPICAL CONNECTIONS
The figure on the following page is for typical connections of radio sets
AN/GRC-106(*).
Connect one Cable Assembly, Special Purpose, Electrical CX-10071/U to
the Amplifier PRIM. PWR. connector and one to the RT POWER connector.
Dress these two cables along the vehicle chassis according to the installation unit instructions.
●
Cut these cables to the required length. Solder two terminal lugs or a
power connector to the cable leads. Connect one terminal lug to the
positive center conductor and the other terminal lug to the negative
braided loom shield. Connect the terminal lugs or the power connector to
the dc source.
●
These two CX-10071/U can be connected to a 27-volt dc power source by
one of the following methods:
1. Directly to vehicle battery.
2. To vehicle battery through Electrical Transient Suppressor, MX7778/GRC (TM 11-5915 -223-12).
3. To a dc power source, such as PP-4763/GRC (TM 11-5820-765-12).
●
Connect one Cable Assembly, Special Purpose, Electrical CX-10099/U to
Amplifier CONTROL connector and RT unit PA CONTROL connector by
turning screw handle on CX-10099/U to the right until it is firmly attached
to the cable connectors.
●
Connect one Cable Assembly Radio, Frequency CG-409H/U to
Amplifier RF DRIVE connector and RT unit RF DRIVE connector by
depressing the coaxial connector on CG-409H/U and turning it to the
right. Use this same procedure to connect another CG-409H/U to
Amplifier RCVR ANT. connector and RT unit RECEIVER IN connector.
2-27
TM 11-5820-520-10
2-28
TM 11-5820-520-10
2-6. GENERAL
CAUTION
After taking the following steps, if trouble is
experienced, refer to higher maintenance.
Do not use the radio set unless you first have your assigned operating and
alternate frequencies. Operate only on frequencies assigned to you. Vehicle
engine must be running when operating radio set. Engine speed should be
high enough to show the battery is charging while you are transmitting on
high power.
NOTE
Check that antenna is connected properly.
CAUTION
To avoid damage to components, do not start vehicle engine while
the radio set is on.
2-7. WARM UP PROCEDURE
• Before operating, the radio set should be in a shutdown condition.
THIS PROCEDURE IS FOR THE RT ALONE.
●
●
Turn the SERVICE SELECTOR switch to OVEN ON and wait at least 10
minutes.
Turn AUDIO GAIN control
to the middle position.
Change 1
2-29
TM 11-5820-520-10
●
●
T u r n MANUAL RF GAIN control all the way to the right.
T u r n SQUELCH switch to OFF.
• Turn FREQ VERNIER control to OFF.
●
Turn VOX switch to PUSH TO TALK.
●
Turn BFO control to the middle position.
• Turn NOISE BLANKER switch to OFF.
NOTE
This applies to RT-662/GRC only.
2-30
TM 11-5820-520-10
2-31
TM 11-5820-520-10
2-8. STARTING PROCEDURE
• Turn RT SERVICE SELECTOR switch to STAND BY.
●
Turn amplifier PRIM. PWR. switch to ON.
• Allow 90 seconds for warm up. Check to see that amplifier blowers are
working.
• Check to see that RT signal level
meter indicates in extreme right
section of meter scale.
NOTE
If indication is not normal,
refer to Chapter 3 under Troubleshooting.
2-32
TM 11-5820-520-10
●
Turn RT SERVICE SELECTOR
RT signal level meter
switch
to SSB NSK.
will return to extreme left section of
meter scale.
●
Set amplifier TEST METER switch to PRIM. VOLT.
2-33
TM 11-5820-520-10
2-9. TUNING PROCEDURE
• Set amplifier TEST METER switch to POWER OUT in order to
monitor RF output during tune-up.
• Take a look at the ANTENNA TUNING AND LOADING CHART on the right
front panel of the amplifier.
Ž The chart will give frequencies and initial settings for ANTENNA TUNE
and ANTENNA LOAD counters.
NOTE
When operating in the CW mode, the transmitted RF is 2 kHz higher
than the frequency indicated on the RT-662/GRC or RT-634/GRC
control panels. All operating frequencies do not appear on the chart.
Use the settings on the chart which are nearest to the operating
frequency you need.
Ž Using frequency 6.125 megahertz as an example.
Frequency 6.125 MEGAHERTZ does not appear
on the chart.
● The nearest frequency listed is 6.000.
●
NOTE
When changing the frequency numbers, allow time for
the equipment to adjust.
To the right of frequency listing 6.000 are the beginning ANTENNA TUNE
and ANTENNA LOAD settings. For frequency listing 6.000 these would be
450 for ANTENNA TUNE and 700 for ANTENNA LOAD.
• To begin tuning the radio set, set the MEGAHERTZ and KILOHERTZ controls on the RT to 6.125.
●
When the controls are adjusted, the frequency numbers will appear in the
windows directly above the controls.
2-34
●
TM 11-5820-520-10
2-35
TM 11-5820-520-10
CAUTION
To prevent damage to equipment during the following steps, be
sure antenna is properly attached.
CAUTION
The amplifier HV RESET switch should not stay in TUNE position
for longer than 2 minutes. If more than 2 minutes are needed, turn
amplifier HV RESET switch to OPERATE and RT SERVICE SELEC-
TOR switch to STAND BY for 5 minutes cooling. After 5 minutes
cooling, turn RT SERVICE SELECTOR switch back to its previous
position. Turn HV RESET switch to TUNE and continue with the tuning procedure. Transmitting without the set properly tuned will
cause damage to the equipment.
CAUTION
To avoid damage to the equipment, read through tuning procedure
before attempting to tune antenna.
●
●
Wait for some movement of the indicator on the ANT. TUNE and ANT.
LOAD meters. This deflection shows the degree of mistuning between
the antenna and the amplifier.
●
Amplifier ANT. TUNE and ANT. LOAD meters must both indicate in the
center scale for the radio set to be tuned. ANT. TUNE and ANT. LOAD controls work with each other.
2-36
TM 11-5820-520-10
NOTE
Antenna tuning procedure must be followed precisely
to ensure finest tuning.
●
Select meter that indicates farthest from center and adjust to middle
position.
●
Now adjust second meter to middle position.
NOTE
This procedure may take many adjustments to complete. If both
the TUNE and LOAD meters refuse to center, slowly turn both
controls at the same time in the same direction. If both meters are
off center to the left, for example, slowly turn both controls to
the right.
●
Continue to alternately adjust meters to middle positions until both
indicate center scale at the same time.
NOTE
If indication is not normal, check Troubleshooting
Table in Chapter 3.
●
Amplifier is tuned when both the ANT. TUNE and ANT. LOAD meters indicate in the center scale at the same time.
Change 1
2-37
TM 11-5820-520-10
● TEST
2-38
METER should indicate left half of gray section of bottom scale.
TM 11-5820-520-10
Turn amplifier TEST METER switch to PA CUR. TEST METER
pointer should indicate in the left half of gray section of bottom scale.
Turn amplifier TEST METER switch to GRID DRIVE. TEST METER
pointer should indicate in the left half of gray section of bottom scale.
Turn amplifier TEST METER switch to DRIVER CUR. TEST METER
pointer should indicate within the two green wedges of top scale.
Turn amplifier TEST METER switch to HIGH VOLT. TEST METER
pointer should indicate within green section of top scale.
NOTE
If indication is not normal, check
Troubleshooting Table, Chapter 3.
●
Turn amplifier TEST METER switch to LOW VOLT. TEST METER
pointer should indicate within green section of top scale.
Turn amplifier TEST METER switch to PRIM VOLT. TEST METER
pointer should indicate between two dark green wedges.
Turn amplifier HV RESET switch to OPERATE. TEST METER pointer
should indicate in extreme left of scale.
Change 1
2-39
TM 11-5820-520-10
2-10. OPERATING PROCEDURE
First perform the WARM UP procedure and STARTING procedure described
in paragraphs 2-7 and 2-8.
● The radio set is now ready to operate.
●
NOTE
The HV RESET switch must remain in the OPERATE position during
radio operation unless the frequency is changed by at least 100
kilohertz for any reason. When this happens, the radio set
automatically programs to the new frequency and keeps the
amplifier from being keyed. This will alert the operator to set the HV
RESET switch back to the TUNE position and reset the ANT. TUNE
and ANT. LOAD controls to retune the amplifier to the new frequency.
2-11. TO RECEIVE SIGNALS
●
When receiving signals first make sure
amplifier HV RESET switch is turned to
OPERATE.
SINGLE-SIDEBAND is the voice mode used
to communicate with other SINGLE-SIDE
BAND radio sets. To operate in the SINGLESIDE BAND voice mode, turn the RT SERVICE
SELECTOR switch to SSB NSK.
●
COMPATIBLE AM is the voice mode used to communicate with stations using radio sets that are not SINGLE-SIDEBAND radio sets. To operate in the
COMPATIBLE AM voice mode, turn the RT SERVICE SELECTOR switch to
AM.
2-40
TM 11-5820-520-10
THE NEXT PROCEDURE IS FOR THE RECEIVER-TRANSMITTER ALONE.
Adjust AUDIO GAIN control for comfortable listening level. The operator will hear a decrease in the
rushing noise. Do not adjust the volume too low or
signals from other stations will not be heard.
●
•
•
Turn SQUELCH switch to ON if the noise level
is still too high.
Turn the MANUAL RF GAIN control to the
maximum clockwise position.
•
•
The signal level meter will indicate the
presence of a voice signal. Indicator will
go to center of scale when signal is
present.
To get the best reception, adjust the FREQUENCY VERNIER when you hear the distant
operator’s voice.
2-12. TO TRANSMIT SIGNALS
●
Turn RT SERVICE SELECTOR switch to desired operate mode SSB NSK,
FSK, AM or CW.
2-4
TM 11-5820-520-10
●
If RT SERVICE SELECTOR switch is turned to SSB NSK or AM, turn VOX
switch to desired position.
SERVICE SELECTOR
●
●
In VOX position, microphone or handset is live
at all times. Operator’s voice keys radio set
everytime he speaks into MICROPHONE or
HANDSET.
In PUSH TO VOX position, depress and hold MICROPHONE or HANDSET
PUSH-TO-TALK switch.
When MICROPHONE or HANDSET PUSH-TO-TALK switch is depressed and
held, radio set transmitter is keyed by operator’s voice.
In PUSH TO TALK position, depress and hold
MICROPHONE or HANDSET PUSH-TO-TALK
switch to receive reply.
IF RT SERVICE SELECTOR switch is turned to CW, VOX switch
is disabled. Radio set transmitter must be keyed with telegraph
key.
2-42
TM 11-5820-520-10
●
If RT SERVICE SELECTOR switch is turned to FSK, VOX switch is disabled
Radio set transmitter must be keyed by appropriate radio teletypewriter
terminal equipment.
●
Audio accessories HANDSET, HEADSET, MICROPHONE, TELEGRAPH KEY
or LOUDSPEAKER can be connected to either of the two AUDIO RECEPTACLES on RT bottom left panel front.
2-43
TM 11-5820-520-10
2-13. STOPPING PROCEDURE
●
Radio set can be put into stand by or shutdown condition. Complete shutdown takes 3 minutes. If radio set is to be off for 1 hour or less, place
in stand by condition.
For stand by condition, keep amplifier HV RESET switch at OPERATE. Turn
RT SERVICE SELECTOR switch to STAND BY.
If radio set is to be OFF for long period, follow complete shutdown procedure:
Turn RT SERVICE SELECTOR switch to STAND BY. Give radio set 2
minutes to cool down.
Keep amplifier HV RESET switch at OPERATE, whether radio set is turned
ON or OFF.
●
Turn amplifier PRIM. PWR. switch to OFF.
●
Turn RT SERVICE SELECTOR switch to OFF.
2-14. EMERGENCY STOPPING PROCEDURE
●
In an emergency, radio set can be stopped immediately.
To turn the radio set OFF in an emergency, turn RT SERVICE SELECTOR
switch to OFF.
2-44
TM 11-5820-520-10
2-15.
PREPARATION FOR MOVEMENT
To avoid a serious or fatal accident when pulling the antenna down,
make sure that the tip is above any pedestrian and that it will not
swing beyond the side of the vehicle.
Change 1
2-45
TM 11-5820-520-10
Section IV. OPERATION UNDER UNUSUAL CONDITIONS
2-16. OPERATION AT LOW TEMPERATURES
●
●
●
●
●
Keep ice off antennas.
Do not bend cables or cords suddenly.
Check to see that ice or snow is not blocking amplifier blower port area.
Make sure vehicle charging system can maintain a satistactory battery
charging rate.
Keep radio set front panel controls free of ice.
NOTE
When operating the radio set in cold climates and shutdown is to be
for 10 hours or less, set RT SERVICE SELECTOR switch to OVEN
ON.
2-17. OPERATION IN DESERT AND DUSTY AREAS
• Keep equipment area as dust free as possible
if radio set is constantly exposed to sun, it should be protected with heat
reflecting paint. Ask supporting maintenance to take care of this.
• Keep water in vehicle battery at proper level.
●
2-18. OPERATION IN TROPICAL CLIMATE
• Keep moisture and fungi off the equipment by wiping with a lint-free
cloth.
● Do not operate equipment without covers for any long period of time.
● Use the air conditioner, if available, to keep the temperature and humidity
down.
2-19. RADIO JAMMING
●
●
●
●
It is important to recognize that your radio may be being jammed. Jamming
is the transmission of a strong, blocking signal on your frequency, making
it hard for you to communicate on the radio set.
This signal may be from a friendly or unfriendly station.
First make sure your receiver is-working right.
Disable the antenna by grounding it.
NOTE
As soon as you know your radio is
being jammed, tell your supervisor.
2-46
TM 11-5820-520-10
2-20. ANTIJAMMING PROCEDURES
To reduce the effects of jamming, try the following:
●
Reposition the vehicle on which the radio set is mounted.
●
Use a line of trees or a nearby building or some other local obstruction as a
screen between you and the possible jamming site.
●
Point your vehicle toward the station you are communicating with. Try a
few different positions.
●
Turn up the level of the RT AUDIO GAIN control. This may raise the level of
the signal you want above the level of the jamming signal.
●
If it is still too hard to communicate on the radio set, get permission to
another frequency.
U Se
2-47
TM 11-5820-520-10
2-21.
DESTRUCTION TO PREVENT ENEMY USE
NOTE
Demolition of the
your commander
upon the amount
mine the manner
equipment will be carried out upon the order of
only. The method of destruction is dependent
of time available. The circumstances will deterin which the equipment will be destroyed.
If you are pressed for time, smash the right side of the RT-662/GRC or
RT-834/GRC with an ax.
● Cut the cables and wires.
●
To avoid serious injury or death, be extremely
careful when using gasoline for destruction.
●
The TM is to be burned first. Burn as much of the equipment as possible.
To avoid serious injury or death, be extremely
careful with explosives and incendiary devices.
Use these items only when the need is urgent,
Use explosives to cause maximum destruction. Place explosive charges
inside the equipment after smashing the front panels. Grenades may be
used to destroy small parts and wiring.
● Bury or scatter destroyed parts in slit trenches and foxholes. If near
a waterway, throw parts into it.
●
2-48
TM 11-5820-520-10
CHAPTER 3
MAINTENANCE INSTRUCTIONS
SUBJECT
PAGE
Cleaning the Radio Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Troubleshooting Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Troubleshooting Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
(2-49 blank)/3-0
TM 11-5820-520-10
3-1. GENERAL
The maintenance duties assigned to you, the operator, are:
●
●
●
●
Performing Preventive Maintenance Checks and Services
Cleaning the radio set
Fuse replacement
Troubleshooting
Turn RT SERVICE SELECTOR switch to OFF to avoid
injury from dangerous voltages.
• Check to see that the vehicular generating system or external
power source is in working order.
3-2. CLEANING THE RADIO SET
• Use soft cloth to remove dust, moisture, and dirt from the
outside of the radio set.
CAUTION
Do not press on meter glass. You could damage the
meters.
• Make sure all panels, meters, and knobs are clean.
• If dirt is hard to remove, dampen cloth with water or mild soap
solution.
Fumes of TRICHLOROTRIFLUOROETHANE are
poisonous. Provide adequate ventilation whenever you
use TRICHLOROTRIFLUOROETHANE. Do not use solvent near heat or open flame. TRICHLOROTRlFLUOROETHANE will not burn, but heat changes the
as into poisonous, irritating fumes. DO NOT breath
f unes or vapors. TRICHLOROTRIFLUOROETHANE
dissolves natural skin oils. DO NOT get solvent on
your skin. Use gloves, sleeves and an apron which solvent cannot penetrate. If solvent is taken internally,
see a doctor immediately.
Dampen (do not wet) cloth with trichlorotrifluoroethane to
remove grease, fungus, and ground-in dirt from equipment covers
● Use brush to remove dust or dirt from plugs and jacks.
●
3-1
TM 11-5820-520-10
3-3.
FUSE REPLACEMENT
●
The next procedure is for the RT alone.
●
If fuse is defective, turn RT SERVICE SELECTOR switch to OFF.
Turn fuse holder counterclockwise and remove defective fuse from
the fuse holder.
Insert replacement fuse from SPARE fuse holder into fuse holder.
Replace fuse holder in receptacle and tighten by turning clockwise.
●
●
3-4. TROUBLESHOOTING PROCEDURES
The Troubleshooting Table tells you some of the troubles you may find
during the operation or maintenance of the radio set. You should perform the
test, inspections, and corrective actions in the order listed.
This manual cannot cover all the troubles that may happen, nor all tests, inspections or corrective actions. If a trouble is not listed or it cannot be corrected by performing the corrective actions, notify your supervisor.
3-2
TM 11-5820-520-10
3-3
TM 11-5820-520-10
TROUBLESHOOTING TABLE - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Check for faulty seating of connector on CX-10071/U to RT
power connector.
Tighten CX-10071/U connector screw handle.
Check for loose connections at vehicle storage battery terminals.
Tighten connections at vehicle storage battery. If none
of the above steps causes the pointer to move, higher
category of maintenance required.
3. ANT. TUN E and ANT. LOAD controls do not interact with ANT. TUNE and
ANT. LOAD meters.
Be sure PRIM. PWR. switch is set to OFF before checking antenna
cable CX-10171/U.
Check for faulty seating of connector on CX-10171/U.
Check both ends for corrosion. Clean contacts untiI
shiny and lube lightly with silicone.
4. Test meter pointer does not move within dark green top scale when test
meter switch is set at HIGH VOLT.
Check for defect in Amplifier.
Turn HV RESET switch to TUNE, wait 60 seconds, and
turn it back to OPERATE. If meter indication is still incorrect, higher category of maintenance required.
3-4 Change 1
TM 11-5820-520-10
APPENDIX A
REFERENCES
A-1.
INTRODUCTION.
Following is a list of all forms, technical bulletins, and technical manuals referenced
in this manual.
A-2.
FORMS.
Equipment Inspection and Maintenance Worksheet. . . . . .
Transportation Discrepancy Report (TDR) . . . . . . . . . . . . . . .
Report of Discrepancy (ROD) . . . . . . . . . . . . . . . . . . . . . . . . . .
DA Form 2404
Form SF 361
Form SF 364
Product Quality Deficiency Report. . . . . . . . . . . . . . . . . . . . . .
Form SF 368
Recommended Changes to Equipment Technical
Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-3.
TECHNICAL
DA Form 2028-2
BULLETINS.
Identification of Radioactive Items in the Army
Supply System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TB 43-0116
Instructions for Safe Handling and Identification
of US Army Communications-Electronics
Command Managed Radioactive Items in the
Army Supply System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TB 43-0122
Safety Measures to be Observed when Installing and
Using Whip Antennas, Field Type Masts, Towers
and Antennas and Metal Poles that are used with
Communications, Radar, and Direction Finder
Equipment (to 31P5-1-1 ) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TB SIG 291
A-4. TECHNICAL MANUALS.
Operator and Organizational Maintenance Manual:
Power Supplies PP-4763/GRC and
PP-4763A/GRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TM 11-5820-765-12
Operator’s and Organizational Maintenance Manual
Including Repair Parts and Special Tools Lists:
Suppressor, Electrical Transient MX-7778/GRC . . . . . . . . .
Operator’s, Organizational, Direct Support, General
Support, and Depot Maintenance Manual: Antenna
Group AN/GRA-50 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Radio Set AN/GRC-106 (NSN 5820-00-402-2263) and
TM 11-5915-223-12
TM 11-5820-467-15
AN/GRC-106A (NSN 5820-00-223-7548) . . . . . . . . . . . . . . . . TM 11-5820-520-10-HR
Procedures for Destruction of Electronics Material
to Prevent Enemy Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TM 750-244-2
A-1
TM 11-5820-520-10
A-5. MISCELLANEOUS PUBLICATIONS.
Consolidated Index of Army Publications and Blank
Forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DA PAM 25-30
The Standard Army Publication System Users
Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. DA PAM 310-10
The Army Maintenance Management System
(TAMES) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DA PAM 738-750
A-2
TM 11-5820-520-10
APPENDIX B
COMPONENTS OF END ITEM AMD BASIC ITEMS LISTS
INTRODUCTION
B-1. SCOPE.
This appendix lists components of end item and basic issue items for the
AN/GRC-106(*) to help you inventory items required for safe and efficient opera
tion.
B-2. GENERAL.
The Components of End Item and Basic Issue Items Lists are divided into the
following sections:
a. Section Il. Components of End Item. This listing is for informational purposes only, and is not authority to requisition replacements. These items art
part of the end item, but are removed and separately packaged for transportation
or shipment. As part of the end item, these items must be with the end item
whenever it is issued or transferred between property accounts. Illustrations are
furnished to assist you in identifying the items.
b. Section Ill. Basic Issue Items. Not Applicable.
B-3.
EXPLANATION OF COLUMNS.
The following provides an explanation of columns found in the tabular
listings:
a. Column (1) - Illustration Number (Illus Number). This column indicates the
number of the illustration in which the item is shown.
b. Column (2) - National Stock Number. Indicates the National stock number
assigned to the item and will be used for requisitioning purposes.
c. Column (3) - Description. Indicates the National item name and, if required, a
minimum description to identify and locate the item. The last line for each item
indicates the FSCM (in parentheses) followed by the part number. If item needed
differs from different models of this equipment, the model is shown under the
“Usable On” heading in this column.
d. Column (4) - Unit of Measure (U/M). Indicates the measure used in performing
the actual operational/maintenance function. This measure is expressed by a
two-character alphabetical abbreviation (e.g., EA, IN, PR).
e. Column (5) - Quantity required (Qty rqr). Indicates the quantity of the item
authorized to be used with/on the equipment.
B-1
TM 11-5820-520-10
B-2
Section II.
Section II.
TM 11-5820-520-10
B-3
TM 11-5820-520-10
B - 4
Section II.
Section II.
TM 11-5820-520-10
B - 5
TM
11-5820-520-10
B - 6 Change 1
Section II.
TM 11-5820-520-10
B-7/(B-8 blank)
TM 11-5820-520-10
GLOSSARY
Deflection . . . . . . . . . . . . . . . . . . . . . . . . The movement of an indicator or pointer
from the zero reading on a meter.
Disable . . . . . . . . . . . . . . . . . . . . . . . . . . Prevent from working.
Indicate . . . . . . . . . . . . . . . . . . . . . . . . . Point out or show.
Interference . . . . . . . . . . . . . . . . . . . . . . Reception of stray or unwanted radio
signals.
Keying . . . . . . . . . . . . . . . . . . . . . . . . . . Activating an electronic circuit.
Radiate . . . . . . . . . . . . . . . . . . . . . . . . . . To send out from a center.
Receptacle . . . . . . . . . . . . . . . . . . . . . . . A mounted electrical fitting containing
the live parts of a circuit.
Glossary-1/(Glossary-2 blank)
TM 11-5820-520-10
INDEX
PAGE
SUBJECT
A
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Amplifier AM-3349/GRC-106 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Antenna description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Antenna tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2-34
Antijamming procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2-47
Assembly and preparation for use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
c
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-1
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Controls and indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2-1
D
Description and use of operator’s controls and indicators . . . . . . . . 2-1
Description of antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Destruction to prevent enemy use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48
Differences between models. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
E
Emergency stopping procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44
Equipment description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Equipment purpose, capabilities, and features . . . . . . . . . . . . . . . . . 1-3
F
Forms, maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Fuse replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . ...3-2
G
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
H
Hand receipt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Index-1
TM 11-5820-520-10
INDEX - Continued
PAGE
SUBJECT
J
Jamming, radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46
M
Maintenance
Forms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-0
Major components, description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Model differences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Mounting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
Movement, preparation for . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45
N
Nomenclature, cross-reference list . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
0
Operating instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Operating procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2-40
Operation under unusual conditions . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46
Operation under usual conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
P
Performance data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Preparation for movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..2-45
Preparation for use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...2-21
Preventive maintenance (PMCS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
Principles of operation, technical . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
R
Radio jamming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-46
Records, maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Replacement, fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Reporting, equipment improvement recommendations . . . . . . . . . . 1-1
Routine checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
RT-662/GRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
RT-834/GRC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
index-2
TM 11-5820-520-10
INDEX - Continued
PAGE
s
Starting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stopping procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stopping procedure, emergency . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-32
2-44
2-44
T
Technical principles of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To receive signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
To transmit signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting
Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tuning procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-9
2-40
2-41
3-2
3-3
2-34
U
Unusual conditions, operation under . . . . . . . . . . . .
Usual conditions, operation under . . . . . . . . . . . . . . . .
.
.
.
....
. . . .
2-46
2-21
w
Warm up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . 2-29
index-3/(index-4
blank)
By Order of the Secretary of the Army:
Official:
ROBERT M. JOYCE
Major General, United States Army
The Adjutant General
Distribution:
To be distributed in accordance with special list.
JOHN A. WICKHAM JR.
General, United States Army
Chief of Staff
PIN : 052291-000
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