ARC AN-Tranciever Aligment Procedure User Guide
NAVWEPS 16-30ARC5-501
Handbook
BENCH TEST
And
ALIGNMENT PROCEDURE
RADIO EQUIPMENT
AN/ARC-5
PUBLISHED BY DIRECTION OF THE CHIEF OF THE BUREAU OF NAVAL WEAPONS
1 October 1949
TABLE OF CONTENTS
SECTION I INTRODUCTION
1--1. PURPOSE OF BENCH MAINTENANCE PROCEDURE.
1--4. DESCRIPTION OF PROCEDURE.
1--6. USE OF THE PROCEDURE.
1--11. GENERAL DESCRIPTION OF AN/ARC-5 EQUIPMENT.
1--14. TEST EQUIPMENT.
SECTION II PERFORMANCE CHECKS
2--1. GENERAL.
2--4. RECEIVER CHECKS.
2--9. BAND NOISE.
2--12. SENSITIVITY.
2--15. SELECTIVITY.
2--17. AVC CHARACTERISTICS.
2--21. TRANSMITTER CHECKS.
2--26. TRANSMITTER TRACKING AND LOADING.
2--29. MODULATION CHECK.
SECTION III ALIGNMENT PROCEDURE
3--1. RECEIVER ALIGNMENT.
3--6. TRANSMITTER ALIGNMENT.
SECTION IV TROUBLE ISOLATION
4--1. RADIO RECEIVER.
4--4. AUDIO-FREQUENCY CIRCUIT.
4--6. INTERMEDIATE-FREQUENCY CIRCUIT.
4--8. CONVERTER CIRCUIT. (Follow chart below).
4--10. RADIO-FREQUENCY CIRCUIT.
4--11. ANTENNA CIRCUIT.
4--12. TRANSMITTER AND MODULATOR.
4--15. OSCILLATOR.
4--16. FINAL AMPLIFIER.
4--17. MODULATOR.
Figure 1-1. AN/ARC-5 Equipment
SECTION I INTRODUCTION
1--1. PURPOSE OF BENCH MAINTENANCE PROCEDURE.
1--2. The basic approach used in the development of this manual has been that of dividing all
equipments into two categories:
a. Components operating at or above a minimum standard of satisfactory performance.
b. Defective or poorly performing components.
1--3. Bench maintenance is reduced, first, to determining whether or not an equipment is operating
satisfactorily, and, second, repairing the equipment if it is found to be defective. This division results in
a procedure having four sections:
a. INTRODUCTION -- This section presents a brief description of the basic function of the subject
equipment, its primary power requirements, inter-unit connecting cables, a suggested bench mock-up,
and other information necessary for quick reference with respect to proper maintenance techniques.
b. PERFORMANCE CHECKS -- These are of primary importance and are to be performed in
sequence upon the subject equipment. An equipment that meets all the requirements of this series of
checks is thereby determined to be satisfactory. An equipment that fails in any one of several of the
check requirements is assigned, by means of proper references, to the appropriate steps in one or
both of the two sections described below.
c. ALIGNMENT -- This section details the steps necessary to return the equipment to a properly
aligned condition. Practical methods requiring a minimum of maintenance time are employed.
d. TROUBLE ISOLATION -- This section of the procedure is divided into sections, each of which deals
with a specific component, stage or stages according to the function of the equipment. When the
maintenance technician is referred to a section of TROUBLE ISOLATION by the failure of the
equipment to meet the standards set up in PERFORMANCE, he will find detailed instructions and data
pertinent to the function. Additional aids in the form of sectional schematics and suggested testing
techniques are at his fingertips. This eliminates time-consuming manual searching, thus increasing the
work output and efficiency of the technician.
1--4. DESCRIPTION OF PROCEDURE.
1--5. The procedure begins with a general description of the appearance, function, and operational
characteristics of the AN/ARC-5 Communications Equipment. It is followed by a block diagram, list of
test equipment and tools, and other necessary information. The procedure proper consists of
PERFORMANCE CHECKS, ALIGNMENT, and TROUBLE ISOLATION sections, each of these
making use of pictorial diagrams, photographs, and sectional schematics. These aids are related to
the written material by means of three types of symbols:
a. A star-encircled letter indicates a MAJOR CHECK POINT, at which satisfactory PERFORMANCE
can be most easily determined.
b. An encircled numeral indicates SECONDARY CHECK POINT, at which more detailed circuit
information such as voltage readings and waveforms, can be obtained for trouble analysis.
c. C-49 -- Manufacturer's circuit symbols, used to cross-reference all diagrams with the written
material.
1--6. USE OF THE PROCEDURE.
1--7. The proper procedure to follow in bench maintenance work is that given by the sequence of the
PERFORMANCE CHECKS. These checks follow an order which will most quickly reveal the proper or
improper performance of the equipment.
1--8. The failure of the equipment to meet one of these checks suggests the need for ALIGNMENT, or
TROUBLE ISOLATION, and appropriate references are made.
1--9. When the reason for defective operation is found and the defect has been corrected, the
technician is directed to return to the PERFORMANCE section, repeat the step at which defective
operation was first noted, and, if PERFORMANCE is satisfactory, to continue with the remainder of the
PERFORMANCE CHECKS.
1--10. Satisfactory completion of the last PERFORMANCE CHECK completes the bench maintenance
for the equipment.
1--11. GENERAL DESCRIPTION OF AN/ARC-5 EQUIPMENT.
1--12. The model AN/ARC-5 Aircraft Radio Communication Equipment (See figure 1--1.) is a multichannel radio transmitter and receiver for use on aircraft having a 22 to 30-volt d-c power supply. The
receivers cover a frequency range of 190 kc to 9.1 mc in five independent units, each unit designed to
be mounted interchangeably into the receiver racks. Racks are available for either two, and/or threeunit installations, the receivers operating singly or simultaneously, depending upon requirements.
Provisions have been made for either local or remote control, but only remote controls are furnished
with the equipment. The receiver mounting racks will accommodate other rack types of equipment
such as the AN/ARR-2 Receiver and AN/ARC-5 VHF Transmitter-Receiver. These units will not be
covered in this procedure. The weight of the equipment, less cables and mechanical linkages, is 23.6
pounds for a two-receiver installation and 55.2 for a three-receiver installation.
1--13. The receivers are designed for the reception of CW, MCW or VOICE modulation. Manual gain
control is employed in conjunction with high level automatic gain control. The outputs of each receiver
may be paralleled on one line to a single headset, or divided for double headset reception by more
than one operator. A 600-ohm headset is to be used with this equipment. A single antenna is used for
all receivers and transmitters. The tuning dials are calibrated directly in mc and their accuracy is better
than 0.5 per cent. The transmitters cover the frequency range of 2.1 to 9.1 mc in five independent
units. They are designed to be installed in pairs. The transmitter frequency control dial is calibrated in
megacycles with an accuracy of .03 per cent or better. A crystal calibrator is used in conjunction with
an electron resonance indicator to spot-check the dial calibrations of each unit. The current drain from
the d-c power source is 8.8 amperes when transmitting with CW emission, and is reduced to 2.5
amperes on "stand-by". The carrier power output varies between eight watts with VOICE modulation to
25 watts with CW emission.
Figure 1-2. Receiver and Transmitter Block Diagrams
1--14. TEST EQUIPMENT.
DESCRIPTION RECOMMENDED
1. Bench Test Set AN/GRM-1 AN/ARC-5 TEST BENCH
2. Frequency Meter LM-13 LM Series
3. RF Signal
Generator
4. Audio Signal
Generator
5. Output Meter Weston 695 Daven OP-182
6. Voltmeter TS-352/U Simpson 260
7. VTVM TS-375/U RCP 662 or RCA Voltohmyst
8. Oscilloscope TS 239/UP Dumont 241
STANDARD
TS-413/U LP-5
TS-382A/U HP-200C
ALTERNATE
HARNESS Stock No. RI6-R1047-25
165
9. Tube Tester Hickok 547 Hickok 545 or 540
1--15. One additional extension cable will be required for the bench test setup to record modulation
wave forms in TROUBLE ISOLATION. It should be a two-conductor cable about six inches long
attached to terminals 10 and 17 of plug 6962 (the plug that fits into modulator receptacle (J-77). The
other end of the two wire extension cable is terminated in two insulated phone-tip jacks, properly
identified as terminals I0 and 17 respectively.
Note
If the AN/ARC-5/ARR-2A Test Bench Harness, ASO stock No. R16-R-1047-25, is
used in place of the AN/GRM-1, there will be an individual meter for each of the switch
positions of the I-104-A and the TS-58/GRM-1. The chart below shows the
corresponding meter for each of the switch positions on the I-104-A and the TS58/GRM-1.
Figure 1-3. Test Equipment Diagram
I-104-A
SWITCH
POSITION
TEST
UNIT
#7369
CIRCUIT I-104-A
READING
#7369
READING
METERS
LABELLED
1 INPUT
VOLTAGE
2 INPUT
CURRENT
3 PLATE
VOLTAGE
Input voltage from primary
source.
Total input current from the
primary source.
Plate supply to 12SF7, 12SK7,
and 12K8 tubes, and screen grid
56 28 V DC
14-17 1.4-1.7 A
46-50 230-250 V
voltage on 12A6 tube.
4 SCREEN
VOLTAGE
5 CATHODE
CURRENT
Screen grid voltage to 12SF7,
12SK7 and 12K8 tubes.
Cathode current of R-F amplifier
and 1st I-F amplifier tubes, type
38-50 76-100 V
44-60 11-15 ma
12SK7s.
6 None Basic movement of meter (50 micro-amperes) direct to-and-
TEST METER binding posts on front panel of I-104-A. I-104A. Insert jumper wire between these two posts to protect the
meter movement.
TS-58/GRM-1
SWITCH
POSITION
TEST
UNIT
#9556
METERS
LABELLED
1 INPUT
VOLTAGE
2 SCREEN
VOLTAGE
3 PLATE
VOLTAGE
4 OSC.
PLATE
CURRENT
5 AMP.
PLATE
CURRENT
CIRCUIT
Input voltage from
primary source
Screen grid voltage to
PA tubes
Plate voltage to final PA
tubes
Plate current of master
oscillator tube, type
1626
Plate current of final PA
tubes type 1625
TS-58/GRM1 READING
#9556
READING
TONE CW TONE CW
54 54 27 27
28-31 48-
60
51-56 51-
55
32-46 32-
46
140155
510550
240300
510550
16-23 16-
23
ma
27-40 60-
80
68100
150200
ma
TEST SET COMPONENTS
TYPE QTY DESIGNATION
ARMY NAVY
1 Antenna A-61-A
1 ANT. Relay
Unit
1 Control Unit
1 " "
3 " " MC-237
1 Cord CD-525
2 " CD-527
1 " CD-528
BC-442-A RE-2/ARC-5 Antenna relay (LF, MF, HF
USE
C-29/ARC-5 Transmitter control (or C-
C-43/ARC-5 Receiver control
Phantom antenna (LF, MF, HF
radio transmitter)
radio transmitter)
30A/ARC-5)
Local tuning crank
DC Outlet to modulator
6-Conductor
5-Conductor
2 " CD-531
2 " CD-532
1 " CD-706
1 " CD-905
2 "
1 "
1 "
6 Diagram
1 Dynamotor DM-33-A DY-8/ARC-5 Dynamotor (transmitting)
1 Modulator
CX-31/GRM-1 12-Conductor
CX-32/GRM-1 18-Conductor
CX-33/GRM-1 Transmitter rack adapter (7-
MD-7/ARC-5 Modulator equipped with
DC Outlet to receiver rack (2Conductor)
8-conductor
Receiver Rack adapter (7Conductor)
Sidetone test
Conductor)
Instructions for test equipment
AN/GRM-1
tubes
1 Mounting Base FT-279-A MT-62/ARC-5 Mounting for MT-63/ARC-5 or
FT-277-A Receiver rack
1 " FT-227-A MT-70/ARC-5 Mounting for MT-71/ARC-5
Radio transmitter rack
1 " FT-225-A MT-76/ARC-5 Mounting (modulator)
1 " FT-229-A MT-77/ARC-5 Mounting (antenna relay unit)
1 Mounting Plate FT-228-A MT-80/ARC-5 Mounting (transmitter control
C-29/ARC-5 or C-50A/ARC-5)
1 " FT-222-A MT-98/ARC-5 Mounting (Receiver control C-
43/ARC-5)
1 Mounting Rack FT-277-A MT-63/ARC-5 Rack for two radio receivers
1 "
1 Test Unit I-104-A
1 " TS-
1 Cord CD-307-A
1 Microphone
1 Headset HS-33
58/GRM-1
MT-71/ARC-5 Rack for two radio transmitters
RS-38A Microphone
Test unit for radio receivers
Test unit for radio transmitters
Headset extension cord
600-ohm headset (two ANB-
H-1 receivers or equivalent)
Figure 1-4. Cable Assemblies CD 532 and CD 528
Figure 1-5. Cable Assemblies CD 531 and CD 525
Figure 1-64. Cable Assemblies CX-31/GRM-1 and CS-32/GRM-1
Figure 1-74. Cable Assembly CD 527
NOTES
1. If Antenna relay unit RE-2/ARC-5, being tested, does not have a series capacitor, connect the
transmitter to "TRANS". Connect "ANT" of the antenna relay unit to terminal "A", instead of to terminal
"5", of antenna A-61-A.
2. Test Unit I-104-A normally is used with adapter cord CD-706 as shown. It may be used by attaching
cord CD-532 to either position of the receiver rack and when so employed, the meter will not indicate
when the meter switch is in position four or five. Volume control on AVC directly affects sidetone level.
3. The drawing shows the mechanical linkage (Part No. 6151) so that the mechanical tuning features
of the control units C-26 and C-43/ARC-5 and radio receivers R-20 to R-27/ARC-5 may be tested. No
linkage is furnished with the test equipment. Control unit MC-257 (local tuning crank) is furnished for
testing these receivers.
4. Test unit I-104-A may be made to function as a control unit and provide the channel selection when
testing VHF radio receiver R-28/ARC-5, by connecting cord CD-527 between jack J-103 on the radio
receiver and jack J-600 on the test unit.
5. Dynamotors *DY-2/ARR-2 and *DY-2A/ARR-2 are furnished with the particular radio receivers as
shown. Both dynamotors are interchangeable with dynamotors DM-32-A or CBY-21531.
6. Transmitters and receivers may be tested either by direct connection to the test equipment, using
cords CX-33/GRM-1 and CD-706, or by mounting in a one or two unit rack and using cords CX31/GRM-1 and CD-532.
SECTION II PERFORMANCE CHECKS
2--1. GENERAL.
2--2. These PERFORMANCE CHECKS are to be made in the order given; when a performance
requirement is not met, a reference is made to the appropriate voltage measurement or signal tracing
procedure in TROUBLE ISOLATION. ALIGNMENT PROCEDURES are included, but are to be used
only as directed in TROUBLE ISOLATION. Signal tracing techniques are used after voltage readings
have been found to be normal. The standard maintenance manual should be referred to for detailed
information concerning the AN/ARC-5 Equipment.
Note
Receiver and transmitter PERFORMANCE CHECKS are divided as shown in the
TABLE OF CONTENTS.
2--3. VISUAL CHECKS. Connect the unit to be checked on the Test Set AN/GRM-1 rack and inspect
the unit for the following:
l. Faulty plugs, threads and pins.
2. Improper fusing.
3. Note evidence of excessive dynamotor ripple at the headset while tuning through the frequency
band.
4. Dirty and chattering antenna relay contacts.
5. Excessive vibration of the unit in rack.
Note
Open filaments can sometimes be detected by noting cold tubes.
2--4. RECEIVER CHECKS.
2--5. D-C POWER SUPPLY AND OPERATING VOLTAGES.
2--6. LIMITS: Input voltage is 27.5 volts dc at 1.7 amps.
Secondary voltage is 230-250 volts dc at 60 ma.
2--7. PRELIMINARY INSTRUCTIONS: Use Test Set AN/GRM-1, as shown in figure 1-3.
Use "Optional Wiring" for greater ease in maintenance testing. Do not key the transmitter. Apply d-c
power and turn the CONTROL SWITCH of Test Set I-104-A to MCW position, allowing the equipment
time to warm up. Do not remove the cover plates until trouble isolation or alignment is indicated by
performance failure. Advance INCREASE OUTPUT control to full clockwise position.
Figure 2-1. Modulation Envelopes
Loading...