ARC General Notes PDF Recievers
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A
USERS GUIDE
TO
AIRCRAFT RADIO
CORPORATION
RECEIVERS
by
M. W. Tauson
One of the neat things about the military is the rather vast quantities in which it produces
surplus for people like us to pick up in equally vast quantities. This process has most likely
been going on since Ceasar's time (although I suspect the market has probably changed a bit)
and will continue as long as there are militaries to have surplus.
Probably the one group of radio equipment to hit the market more heavily than any other is
that known as the Command sets. These units (specifically the ATA/ARA, SCR-274N, and
ARC-5 sets) were released as surplus after World War II and are still showing up in new,
unused condition some 35 years later. They have been converted from mild to wild and are
responsible for getting quite a few people on the air who could not have otherwise afforded a
rig, myself included.
The original design that started this avalanche came from Aircraft Radio Corporation. There
were three major builders, A.P.C., Stromberg-Carlson who built most of the early ATA/ARA
sets as well as some of the ARC-5's and later Type 12's, and Western Electric who built most
of the SCR-274N's (Navy rigs with Army markings essentially) plus the VHF Command sets.
There were other suppliers but not any that produced the quantities that these did.
As a general rule, SCR-274N and ATA/ABA equipment may be mixed freely. ARC-5
receivers may be used with the other two series, as may the racks, control boxes, etc. ARC-5
transmitters, modulators, racks and control boxes for the transmitters will not mate with their
counterparts due to connector differences. It is interesting to note that the various receivers
would also fit the SCR-274N and ATA transmitter racks which probably lead to the early (if
not smelly) demise of a few receivers, and played a part in the design change for the ARC-5
transmitter rack.
The A.R.C. type 15 receivers will fit the Command set racks however the pin assignments are
different necessitating some re- wiring. The Type 12 receivers and the TV-10 transverter also
fits however there is no rear connector on them nor is there any method to lock them in place.
The modifications are very simple however and it does make for a convenient way to mount
the unite.
The various control boxes are useful not only for controlling 'in type' equipment but also for
other pieces.
The information on the following pages is from tech manuals, schematics and in some cases
from the units themselves. There are no schematics- these are available from such sources as
the nice people at Fair Radio Sales. What is here is some very basic info on 'What is it?' and
'How do I make it work?'. There are equipment lists, pinots, some VERY brief specs,
connector lists, and a few quick hook-ups so you can light off the rig without too much fuss
and bother.
Some pieces not in the Command and Type 12 series are included, and some that are parts of
the various series are not here. The criteria for these two groups was availability- the former
are generally available and the latter aren't.
Where possible, included the A.R.C. part number for the various units, which provides a
ready made cross-reference between the series. There are at the end a series of lists in numeric
order to assist in this referencing.
The ATA/ARA and some pieces of the ARC-5 sets are identified by a five digit number. This
is the numeric portion of the Navy accounting number of the item. The Navy accounting
system is a method of uniquely identifying equipment and consists of a three letter and five
digit code. The three letters (the first of which is always 'C') identifies the builder, with CBY
(A.R.C.) and CCT (Stromberg-Carlson) being the ones most commonly found on the
Command set units. The first two digits of the numeric portion identify the type of unit (46 for
receivers, 52 for transmitters, etc with related pieces carrying the same type identifier) and the
last three digits uniquely identify the particular unit. Note that a CBY-46104 receiver and a
CCT-46104, for example, are the same receiver built by two different builders. For this
reason, the builder code has been deleted from the following lists.
The builder code does appear on some, if not all, ARC-5 units on the identification plate after
the serial number. On the other series, the builder's name often is on the identification plate at
the bottom.
At some point or another, I hope to have an addendum covering items missed plus any added
information that may be of use. Any assistance toward this end will be gratefully accepted,
and will be acknowledged in the addendum. In the mean time, however, I would like to thank
George Sellout at Fair Radio for his help (and for being tolerant of me!), Gordon Eliot White
for getting me interested in A.R.C. through his many fine articles, and, of course, the Aircraft
Radio Corporation for their excellent products which have brought many hours of pleasure.
EQUIPMENT LISTS
The equipment lists are broken into four groups, SCR-274N & ATA/ARA, AFC-5, Type 12,
and Miscellaneous. Some very minor specs are presented on the receivers and transmitters
and, where possible, A.R.C.'s part number is given. To assist in locating a particular piece, the
lists are broken into sections-Receivers, Transmitters, etc.
SCR-274N, ATA/ARA
Receivers
Freq. RNA
Identification
SCR-274N
Navy (ARA)
IF
Sense
Select(kHz)
(MHz)
.19 .52 1.5 3.0 6.0 -
Mil
BC-453
BC-946
....
BC-454
BC-455
.55
1.5
3.0
6.0
9.1
ARC#
7594
Mil ARC#
46129 7839
46145 5950
46104 5005
46105 5006
46106 5007
7595
7596
(kHz)
85
239
705
1415
2830
(uv)
7
8
6
7
8
3db
1.7
2.9
3.9
7.5
9.8
Transmitters
Freq Rng
(MHz)
2.1 - 3.0
3.0 - 4.0
4.0 - 5.3
5.3 - 7.0
7.0 - 9.1
Identification
SCR-274N
Mil
ARC#
....
BC-696
BC-457 7632
BC-458 7633
BC-459 7634
Navy (ATA)
Mil
ARC#
52232
7916
52208
5009
52209
5010
52210
5011
52211
5012
Power
In(W)
89
88
88
90
90
Accessories
Identification
Item Name
SCR-274N
Modulator
BC-456 50083
Antenna Relay
BC-442 29125
Dynamotor, Rec
DM-32
21531
Dynamotor, Tran
DM-33
21626
Navy
7591
5017
7351
5168
Adapt., Rem Ctl
Adapter, Power
Adapt., Lcl Ctl
6433
9074 For Inst. Land. Sys.
6434
FT-230 49107
FT-310 62036
FT-260 -
ARC#
Notes
ARC # for Navy is 5013
250v, 60ma
575v, 160ma continuous
540v, 250ma intermit
Control Boxes
Function
Transmitter
1 Receiver
2 Receivers
3 Receivers
Identification
SCR-274N
BC-451
BC-473
BC-496
BC-450
Navy
23243
23261
23155
23251
ARC#
7095
7043
6546
5014
Racks and Mounts
Trans & Rec
# Units
1 Mount
Rack
2 Mount
Rack
3 Mount
Rack
4 Mount
Rack
Identification-Rec
SCR-274N
Navy
FT-231
FT-233
FT-279
46085
FT-277
46110
FT-221
46150
FT-220
46149
FT-278
FT-264
-
ARC#
7059
7509
5694
5018
7060
7537
5696
5019
Identification-Trans
SCR-274N
Navy
FT-232
FT-234
FT-227
52213
FT-226
52212
FT-262
FT-276
FT-332
FT-331
-
Other Mounts
ARC#
7061
7507
7062
5020
7063
7638
7064
6090
lOdb
3.1
4.9
6.4
12.5
24.2
Unit Mounted
Modulator
Antenna Relay
Ctl Box, Trans
Ctl Box, 1 Rec
Ctl Box, 2 Rec
Ctl Box, 3 Rec
Identification
SCR-274N
FT-225
FT-229
FT-228
FT-235
FT-240
FT-222 *
Navy
50084
29126
*
*
*
7054
ARC#
7058
7056
7083
7053
6831
Miscellaneous
Item Name
Dial, .19-.55 MHz
Dial, .52-1.5 MHz
Dial, 1.5-3.0 MHz
Dial, 3.0-6.0 MHz
Dial, 6.0-9.1 MHz
Wired Plug
Adapt.
Kit, Tuning Shaft
Knob, Lcl Tuning
Adapter, Rt angle
Identification
SCR-274N
MC-214
MC-415
-MC-213
MC-2i2
PL-192
Navy
*
*
*
*
*
-
ARC-5
6051
6052
7575
6053
6054
6787
Notes
For ctl boxes
"
"
"
"
"
"
"
"
"
"
"
"
Used with Lcl Ctl
MC-215
MC-237
MC-211
*
-
6151
6743
6357
Also MC-236
For tuning shaft
* designates no unique identification assigned to this piece.
ARC-5
Receivers
Freq Rng
(MHz)
.19 - .55
.19 - .55
.19 - .55
.52 - 1.5
1.5 - 3.0
3.0 - 6.0
6.0 - 9.1
100 - 156
Ident
ARC-5
R-23
R-23A
R-148
R-24
R-25
R-26
R-27
R-28
ARC#
9602
10007
10008
9603
9604
9605
9606
IF
(kHz)
85
85
85
239
705
1415
2830
12mHz
Sens
(uv)
Select(kHz)
3db lOdb
5
5
7
7
6
6
1.1
1.1
2.1
3.2
7.3
13.0
Transmitters
Freq Rng
(MHz)
.50 - .80
.80 - 1.3
1.3 - 2.1
2.1 - 3.0
3.0 - 4.0
4.0 - 5.3
5.3 - 7.0
7.0 - 9.1
100 - 156
Identification
ARC-5
Navy
T-15
52302
T-16
52303
T-17
52304
T-18
52305
T-19
52306
r-20
52307
T-21
52300
T-22
52309
T-23
ARC#
9315
9316
9317
9308
9309
9310
9311
9312
Power
In(W)
106
102
107
96
99
Accessories
Ident
2.2
2.2 *12v Fil.
4.0
6.0
13.0
26.0
Item Name
Modulator
Antenna Relay
Antenna Tuner
Dynamotor, Rec
"
"
"
"
Dynamotor, Tran
ARC-5
MD-7
RE-2
TN-6
DY-1
DY-2A
DY-2B
DY-8
ARC#
9313
5017
9607
Adapt., Rem Ctl
Adapter, Power
Adapt., Lcl Ctl
Adapter, Audio
MX-21
MX-20
C-24
MX-19
6433
9074
6434
9595
7351
10009
5168
Notes
Navy Acct'g # is 50141
250v,
"
"
575v,
540v,
60ma,
"
,
"
160ma
250ma
12v in
24v in
"
continuous
intermit
For Inst. Land. Sys.
Control Boxes
Controlled Function
Remote Ant/Loop Sw
1 Rec, Tunable
1 Rec, Lock-tuned
HF Transmitters
HF Trans, VHF Chan
HF Trans, VHF Chan
Main Ctl Box
Ident
ARC-5
C-25
C-26
C-27
C-29
C-30
C-30A
C-38
Auxiliary Ctl Box
1 Rec, VHF
3 Rec, 2 HF & 1 VHF
Auxiliary Ctl Box
1 Rec, Tuneable
1 Rec, Tunable LF
C-39
C-42
C-43
C-48
C-125
C-744
ARC#
Notes
Via mech. link to rec.
9601
9850
7314
9910
9610
9901
9902
9911
Push-button Tr, Ch sel
Rotary Tran, Chan sel
Recs: 2 HF lock-tuned,
1 VHF, 1ARR-2,
Trans & Rec Audio
ICS/Radio Sel, T & R Audio
HF Rec are Tunable
As C-39, Has Mic Relay
Panel Mount, Like C-26
New Panel Mt, No BFO Ctl
Jack & Junction Boxes
Function
Jack Box, Mic/Tel
Junct Box, System
Jack Box, Mic/Tel
Jack Box, Mic/Tel
Ctl Split, VHF Chan
Ctl Split, Trans
Ident
ARC-5
J-16
J-17
J-22
J-22*
J-28
J-34
ARC#
9905
9903
9867
9907
9609
9562
Notes
No Vol Ctl or Mic Relay
For Multi-system Install.
No Mic Relay
Has Vol Ctl & Mic Relay
For C-30* to R-28 & T-23
For Multiple Trans Racks
On 1 Modulator
Racks & Mounts
Trans & Rec
# Units
1 Mount
Rack
Rack
2 Mount
Rack
3 Mount
Pack
Ident-Rec
ARC-5
ARC#
MT-5
7059
MT-7A
7509
MT-411 9202
MT-62
5694
MT-63
5018
MT-64
7060
MT-65
7537
Ident-Trans
ARC-5
ARC#
MT-68
7061
MT-69
9306
-MT-70
7062
MT-71
9307
MT-72
7063
MT-73
9593
Wired for 12v
4 Mount MT-66
Pack
MT-67
5696
5019
MT-74
MT-75
7064
9394
Other Mounts
Ident
Unit Mounted
ARC-5
Modulator
MT-76
Antenna Relay Mt-77
Antenna Tuner MT-159
Ctl & Jack Box MT-78
Control Box
MT-4
Ctl & Junct Box MT-80
ARC#
7067
7065
7057
9451
7053
7083
Control Box
Junction Box
7054
9904
MT-98
MT-84
Notes
For C-27, j-16,-22,-22'
For C-26
For C-29,-30,-39,-48'
J-28,-34
For C-38,-43
For J-17
Miscellaneous
Item Name
Dial, .19 - .55 MHz
Dial, .52 - 1,5 MHz
Dial, 1.5 - 3.0 MHz
Dial, 3.0 = 6.0 MHz
Dial, 6.0 - 9.1 MHz
Wired Plug
Kit, Tuning Shaft
Knob, Lcl Tuning
Knob, Lcl Ant/Loop
Knob/Cap, Lock-tun'g
Adapter, Rt Angle
Ident
ARC-5
ID-25
ID-26
ID-27
ID-28
ID-29
J-33
*
*
*
*
MX-22
ARC#
Notes
6051
For tunable Rec Ctl Box
6052
"
"
"
"
"
7575
"
"
"
"
"
6053
"
"
"
"
"
6054
"
"
"
"
"
6787
Used With Lcl Ctl Adapter
6151
7643
7491
9554
6357 Used with Tuning Shaft
* No unique identifier in ARC -5 system
Note: The following are components of the ARR -2 system that
are used with the ARC -5 system: DY-l, DY-2A, DY-2B, MT-4,
MT-5, MT-7A, MX-22.
Type 12
Receivers
Freq Rng
(MHz)
.19 - .55
.52 - 1.5
24v
108 - 136
118 - 148
Identification
Civilian
Mil
R-11(12v)
P-510
R-11(24v)
R-511
R-10
IF
(_Hz)
85k
85k
239k
Sens
(uv)
2
2
2
Select(kHz)
6db
60db
5.6
5.0
7.6
Notes
12v
24v
12 or
R-15(12v)
R-15(24v)
R-19(12v)
R-19(24v)
15m
15m
15m
1Sm
2
2
2
2
100.
100.
100.
100.
12v
24v
12v
24v
R-509
R-507
R-508
Transmitters
Freq Rng
(MHz)
Identification
Civilian
Mil
Tubes
Used
Power
Out(w) Notes
350.0
350.0
350.0
350.0
116 - 132
132 - 148
(see note)
T-11A
T-11B(12v)
T-11B(24v)
T-13
T-13A(12v)
T-13A(24v)
6AQ5
5763
5763
6AQ5
5763
5763
T-336
T-366
T-363
T-364
2
2+
2+
2
2+
2+
12 or 24v
12v
24v
12 or 24v
12v
24v
Note: Freq may be lowered to 125 mhz by using capacity pla tes
ARC# 15392 for the T -13 and ARC# 15900 for the T -13A.
Dynamotors
D-10A(12v), ARC# 14480: 12v,3.4a in, 250v,85ma out
D-10A(24v), APC# 14482: 24v,l.7a in, 250v,85ma out
Note: Dynaverter DV-10,-1OA is later replacement
Junction & Jack Boxes
Item Name
Jack Box
Junction Box
Junction Box
Junction Box
Ident
J-10
J-12
J-13
J-15
Notes
Aircrew Mic/Tel
32 Tie points. 12v
32 Tie points, 24v
56 Tie points, 24v
Control Boxes
Ctl'd Function
1 Rec
1 Rec
Loop Heading
3 Rec. 2 Tran.
Ident
C-16
C-17
C-18
C-24
3 Trans
C-25
2 Rec. 3 Trans. C-36
2 Rec. 3 Trans C-37
2 Rec. 3 Trans C-38
2 Rec. 2 Trans C-39
3 Rec. 3 Trans C-40
1 Rec. Loop Hdg C-48
1 Rec. 4 Trans C-56
Notes
Dial for R-11A
Dial for R-15
1 ea, R-lO,-ll,-15, 2 Type 12 Trans
Loop Heading, Panel Mount
2 Type 12, 1 Extern Trans
1 ea: R-11,-19, 2 Type 12 trans.
I Extern Trans, Loop Heading.
Panel Mount
Like C-36, No Loop or Panel Mount
1 ea: R-11,-15. 2 Type 12 Trans,
1 Extern Trans
As C-36, panel Mount, No Extern Trans
Loop Heading
1 ea: R-11,-19, Tunable HF ARC-5 Rec.
1 ea: HF & VHF ARC-5 trans, Extern Trans
Panel Mount
Dial for R-11, Loop Heading, New Panel Mt
Dial for R-19, 3 Type 12 Trans, 1 Extern
Trans, Whistle-stop, New Panel Mount
Mounts
Unit Mounted
1 Transmitter
1 Receiver
Control Box
Control Box
Control Box
Ident
M-11
M-12
M-13
M-18
M-19
Notes
For C-37,-38, Like ARC# 6831
For C-16,-17,-18, Like ARCF 7053
For C-25, Like ARC# 7083
Miscellaneous
Item Name
Antenna, VHF
Antenna, Loop
Kit. Wire Antenna
Kit. Tuning Shaft
Wired Plug
Ident
A-12
L-10
-
Notes
3-Section Rod
9" Dia, Mil, AT-382
ARC# 12296
ARC# 6151
ARC# 11934. Used when oper'g Rec
without Trans.
Related Equipment
SCR-274N, ATA/ABA
Receiver Test Set-up, ARC# 7918 (Mil: RC -54A)
Consists Of: 7369 Meter Panel, Single Rec Rack & Mount,
Dynamotor, Tuning Knob, and Cables
Transmitter Test Set-up, ARC# 7919 (Mil: RC -55A)
Consists of: 7507 Meter Panel, Single Trans Rack & Mount,
Modulator & Mount, Dynamotor. Ctl Box, Cables,
and ARC# 7777 Dummy Ant . (Mil: A-61A)
ARC-5
Receiver Test Set-up (as SCR-274N, ATA/ARA)
Transmitter Test Set-up, ARC# 9558
Consists of: 9556 Meter Panel, Crystals for 3, 4, 5.3,
7. & 9.1 MHz and contents of ARC# 7919 Set -up.
R-4/APR-2 Homing Receiver, 234 -258 MHz
Includes: C-2/APR-2 Ctl Box (if rec is used alone.)
MX-2/ARR-2 Wired Plug for Rec Rack
A.R.C. Type 12
R-20
R-22
R-836
Fixed-tuned (75 MHz) Marker Beacon Rec
.55-1.5 MHz Rec (Like R-10 but later model)
.19-1.75 MHz ADF Rec, Part of ARN -59 System
Includes C-2275/ARN control Box
TV-10
(CV-431/AR) Transvertor
Trans: 228-258 MHz, Converts 228 -258 MHz to 118-148 MHz Rec.
Type 15 Equipment (VOR/ILS Receiving Eq't)
R-13 (R-445/ARN-30) 108-136 MHz Rec.
R-34 (R-1021/ARN-30D) 108-126.9 MHz Crystal-ctl'd Rec
B-13 (CV-265/ARN-30) VOR/ILS Converter
E-14 (MT-1175/ARN-30) Equipment Rack
C-81,-88 Control Boxes For R -34
C-3436A/ARN-30 Ctl box for R-1021/ARN-30D
PINOUTS
On the following few pages are pinouts for the connectors on most of the equipment
previously listed. The same order of categories is preserved as used in the previous section
however they are collected so that all the receivers are together, etc for the main equipment.
The related equipment is still separate and at the end of the section.
Except for two cases, all the connectors are numbered anticlockwise when viewed from the
outside. The exceptions are the connectors on the rear of the rack-mounted receivers and
transmitters, and those on the rear of the receiver adapters.
The number in parenthesis is A.R.C.'s part number for the receptacle in question. The
'Connectors' section following this one is ordered numerically on this number, and can be
used to locate the proper plugs to match.
Notes are indicated by an asterisk and a one or two digit number (for example, *4 or *28.)
The notes are at the end of the section. The number refers to a particular note.
An Asterisk used as a suffix to a unit's identifier means that all versions of the unit are being
referenced. For example J-22- refers to the J-22, J-22A, and J-22B.
Receivers
Command Receivers (All
J-1 (4724) To Adapters
1 Gain Ctl
2 Gnd
3 n/c
Series)
*8
4 Nav Audio *1
5 CW Shut-off
6 +LV to Rec
J-3,-102 (5488) To Rack
1Gnd
4 CW Shut-off *7
2 Audio Out
5 +Vscr out *8
3 Gain Ctl
6 +LV Source In
J-103 (5577) To Channel Select Ctl Box *9
1 Sel Chan A
3 Gnd
2 Sol Chan B
4 Sol Chan C
7 +LV Source Out
8 +HV Out
7 +HV out
5 Sol Chan D
6 n/c
A.R.C. R-10,-ll
J-502,-602 (12427) To Primary Power Source
A +LV Source In
B Gnd
J-503,-603 (11905) To Rec Ctl Box
A Audio Out
C Gnd
B Loop Relay
D +LV to Rec
E Sons
F +LV Source Out
J-506,-606 (11905) To Transmitter *2
A +HV to Trans
C Gnd
B Audio Out
D +LV to Trans
E +HV to Rec
F n/c
A.R.C R-15,-19
J-lO1,-301 (12427) To Primary Power Source
A +LV Source In
B Gnd
J-102,-302 (11905) To Rec Ctl Box
A Audio Out
C Gnd
B Audio Hi-Lo
D +LV to Rec
E Sons
F +LV Source Out
J-103,-303 (11905) To Transmitter *2
A +HV to Trans
C Gnd
B Audio Out
D +LV to Trans
E +HV to Rec
F n/c
Transmitters
SCR-274N, ATA
J-64 (5488) To Rack
1 Gnd
2 P.A. Grid
3 Osc B+
4 P.A. Vscr
5 Select (key)
6 +LV In
7 P.A. B+
ARC-5
J-69,-308 (9302) To Rack
1 n/c
4 Gnd7 P.A. 5*
2 Osc B+
5 +LV In
3 Select (key)
6 P.A. Vscr
J-79 (9849) To Antenna Tuner *3
1 Select (key)
2 Gnd
3 +LV Out
J-309
1 Sel
2 Sel
3 Sel
(7026) To Channel Select Control *10
Chan A
4 Gnd
Chan B
5 Sel Chart D
Chan C
6 Key
7 Voltage Reg.
8 n/c
J-307
1 Osc
2 1st
3 2nd
(6418) To Test Set *10
Ig
4 Gnd
H.G. Ig
5 P.A. Ig
H.G. Ig
6 P.A. Ik
7 +LV
8 +HV
A.R.C. T-11(),-13()
J-204,-404,-2302,-2402 (11905) To Rec
A +HV to Trans
C Gnd
B Rec Audio In
D +LV In
E .HV to Rec
F +LV Source
J-205,-405,2306,-2406 (12093) To Audio
A Mic In
C Gnd
B Key
D Tel Out *4
J-207,-407,-2303,-2403
A Sel Chan 1
B "
" 2
C "
" 3
(12097) To Ctl Box
D Gnd
E Sel Chan 4
F "
" 5
G +LV to Ctl Box
H +LV In
*5
Accessories
Modulator (SCR-274N, ATA/ARA)
J-52 (5577) To Rec Rack
1 Sidetone Inject
3 Gnd
2 n/c
4 n/c
5 Key
6 +LV
J-53 (7024) To Primary Power Source
1 +LV Source In
2 Gnd
3 +LV Source In
J-54 (7027)
1 Sel Trans
2 "
"
3 "
"
4 "
"
5 Meter +
6 Meter -
13
14
15
16
17
18
To Control Box
1
7 Gnd
2
8 Mic
3
9 Key
4
10 Voice Sidetone
11 Tone Sidetone
12 Dyn. Relay
Modulator (SCR-274N, ATA/ARA), Con't
J-58 (7025) To Trans Rack
I Meter +
5 Gnd
Modulator Cath.
1000-cycle Off
+LV to Eq't
Voltage Reg.
Sidetone Inject
+LV Source Out
9 Sel Trans 1
2 Meter 3 Key
4 +LV
6 Sel Trans 4
7 "
"
3
8 "
"
2
10 P.A. B+
11 0sc. B+
12 P.A. Vscr.
Modulator (ARC-5)
J-52 (5577) To Rec Rack
1 Sidetone 1
3 Gnd
2 A-Tel
4 B-Tel
5 Key
6 +LV
J-53 (7024) To Primary Power Source
1 +LV Source In
2 Gnd
3 +LV Source In
J-70 (9417) To Trans Rack
1 +LV
5 Sel Trans 3
2 Sel Trans 1
6 "
"
4
3 "
"
2
7 Key
4 Gnd
8 P.A. B+
9 +HV
10 Osc. B+
11 Test Relay
12 P.A. Vscr.
J-74 (7026) To External Equipment
1 Mic
4 Gnd
2 A-Tel
5 Sidetone 1
3 B-Tel
6 Sidetone 2
J-78 (5571) To Ctl Box
1 Sel Trans 1
7 Gnd
2 "
"
2
8 Mic
3 "
"
3
9 Key
4 "
"
4
10 Voice Sidetone
5 n/c
11 Tone Sidetone
6 Sel Common
12 Dyn. Relay
Antenna Relay (All Series)
J-61 (7023) To Trans Rack
1 Key
3 Gnd
2 Meter +
4 +LV In
Antenna Tuner (ARC-5)
J-1601,-1602 (9849) *11
1 Key
2 Gnd
Remote Ctl Adapter (SCR -274N, ARA, ARC-5)
J-31 (6063) To Rec Adapt. Cavity
1 n/c
4 n/c
2 n/c
5 n/c
3 n/c
6 Jmpr to 7
Power Adapter (SCR-274N, ARA, ARC-5)
J-29 (6076) To Rec Adapt. Cavity
1 n/c
4 n/c
2 Gnd
5 n/c
3 n/9
6 +LV (Jmpr to 7)
J-30 (2226) To External Eq't
25 +LV
27 Grid
26 n/c
35 +HV
Lcl Ctl Adapter (SCR-274N, ARC-5)
J-32 (6962) To Rec Adapt. Cavity
1 Gain Ctl
4 n/c
2 Gnd
5 CW Shut-off
3 n/c
6 +LV Source
7 Key
8 +LV
13
14
15
16
17
18
Modulator Cath.
l000-cycle Off
+LV To Eq't
Voltage Reg.
Sidetone Inject
+LV Source Out
5 Meter -
3 +LV In
7 jmpr to 6
8 n/c
7 +LV (Jmpr to 6)
8 +HV
36 n/c
7 +LV to Rec
8 n/c
Audio Adapter (ARC-5)
J-27 (6036) To Rec Adapt
1 Gain Ctl
4
2 Gnd
5
3 n/c
6
Cavity
Navig. Audio
CW Shut-off
+LV (Jmpr to 7)
J-28 (9336) to External Eq't
1 Audio
2 Gnd
7 +LV (Jmpr to 6)
8 n/c
3 Relay Ctl
Control Boxes (SCR-274N, ATA/ARA)
Transmitter
J-55 (7027)
1 Sel Trans
2 "
"
3 "
"
4 "
"
5 Meter +
6 Meter -
Ctl Box
To Modulator
1
7 Gnd
2
8 Mic
3
9 Key
4
10 Voice Sidetone
11 Tone Sidetone
12 Dyn. Relay
13
14
15
16
17
18
Modulator Cath.
1000-cycle Off
+LV to Eq't
Voltage Regulator
Sidetone Inject
+LV Source
J-56 (2674) To External Meter
+ Meter +
(blank) Meter Receiver Ctl Boxes (Singl e or Multi.)
J-25,-26,-27 (6418) To Rec Rack
1 +LV Source
4 Gnd
2 Rec Audio
5 B-Tel
3 Gain Ctl
6 +LV to Rec
7 CW Shut-off
8 A-Tel
Control Boxes (ARC-5)
Single Rec, Tunable (C -26)J-4 (6418) To Rec Rack
1 +LV Source
4 Gnd
7 CW Shut-off
2 Rec Audio
5 B-Tel
8 A-Tel
3 Gain Ctl
6 +LV To Rec
Single Rec, Lock-tuned (-27)
J-5 (9835) To Rec Rack
1 Gain Ctl
2 Gnd
HF Trans Ctl (C-29)
J-77 (5571) To Modulator
1 Sel Trans 1
7 Gnd
2 "
"
2
8 n/c
3 "
"
3
9 Key
4 "
"
4
10 Voice Sidetone
5 n/c
11 Tone Sidetone
6 Sel Common
12 Dyn. Relay
13
14
15
16
17
18
Modulator Cath.
lO00-cycle Off
+LV to Eq't
Voltage Reg.
Sidetone Inject
+LV Source
HF Trans & VHF Chan Sel (C -30,-30A)
J-402,-1700 (5571) To Modulator
- Pinout same as J-77 on C-29 above)
J-401,-1701 (7025) To VHF Eq't
1 Trans Chan A
5 Gnd
2
"
" B
6 Key
3
"
" C
7 Rec Chan A
4
"
" D
8 "
"
B
9 Rec Chan C
10 "
" D
11 Voltage Reg
12 n/c
Main Ctl Box (C-38)
J-1001 (7027) To Eq't or Junct. Box J-17
1 Sens(VHF)
7 Gnd
2 Sens(HF)
8 Key(MHF)
3 Mic Inp(MHF)
9 Key(VHF)
4 Mic Inp(VHF)
10 CW S-O(ARR-2)
5 Mic Inp(ICS)
11 Audio(Pilot)
6 Mic(Pilot)
12 Audio Buss
13
14
15
16
17
18
Sens(ARB)
Pitch(ARR-2)
Key(Pilot)
Key(ICS)
Sens(ARR-2)
Audio(VHF)
Auxiliary Ctl Box (C-39,-48) *14
J-1101,-1102 (7025) To Eq't or Junct. Box J -17
1 Audio(ICS)
5 Gnd
9 Key(VHF)
2 Audio Buss
6 Mic Inp(HF)
10 n/c
3 Key(ICS)
7 Mic Inp(VHF)
11 Key(HF)
4 n/c
8 Mic Inp(ICS)
12 +LV
J-1103 (9336) To External Key
1 n/c
2 Gnd
VHF Rec Ctl Box (C-42)
J-460 (6418) To Rec Rack
1 +LV Source
4 Gnd
2 Rec Audio
5 B-Tel
3 MVC (Gain Ctl)
6 +LV To Rec
3 Key
7 AVC Ctl
8 A-Tel
J-463 (2674) To Rec Rack (J -6 or J-7)
+,(blank) Rec Audio
(shell) Gnd
HF & VHF Rec Ctl (C-43)
J-410,-411 (6418) To Rec
1 +LV Source
4
2 Rec Audio
5
3 Gain Ctl
6
Rack, HF Rec Positions
Gnd
7 CW Shut-off
B-Tel
8 A-Tel
+LV to Rec
J-412 (6418) To Rec Rack, VHF Position
-Pinout as J-460 on C-42 aboveJ-413 (2674) To Rec Rack (J -6 or J-7)
+,(blank) VHF Audio
(shell) Grid
Single Rec, Tunable (C -125)
J-1900 (6418) To Rec Rack
1 +LV Source
4 Gnd
2 n/c
5 n/c
3 Gain Ctl
6 +LV to Rec
Single Rec, LF Tunable (C -744)
J-1900 (6418) To Rec Rack
1 n/c
4 Gnd
2 Panel Lights
5 n/c
3 Gain Ctl
6 n/c
7 CW Shut-off
8 n/c
7 n/c
8 n/c
Control Boxes (Type 12)
Single Rec, LF (C-16)
J-701 (11905) to Rec
A n/c
B Ant/Loop Sw
Single Rec, VHF (C-17)
C Gnd
D +LV to Rec
E Sens
F +LV Source
J-801 (11905) To Rec
A n/c
B Audio Hi-Lo
C Gnd
D +LV to Rec
3 Rec, 2 Trans, Loop (C -24)
J-lO01 (12096) To Eq't or Junct. Box
A Sel Chan 1
H Sel Trans 2
B "
" 2
I Chan Sel Common
C "
" 3
J +LV (VHF)
D "
" 4
K +LV (Range)
E "
" 5
L +LV (Bcst)
F Mic Key
M Sens (VHF)
G Sel Trans 1
N Audio Hi-Lo (VHF)
E Sens
F +LV Source
O
P
Q
R
S
Sens (Range)
Ant/Loop (Range)
Sens (Bcst)
Ant/Loop (Bcst)
n/c
P
Q
R
S
O Mic Audio
Mic Key
Gnd
Tel
n/c
J-1002 (12093) To Primary Power Source
A +LV Source
B Gnd
C "
"
D "
3 Trans (C-25)
J-1101 (12096) To Eq't
A Sel Chan 1
B "
" 2
C "
" 3
D "
" 4
E "
" 5
F Mic Audio (Tr 1)
G Key (Trans 1)
or Junct. Box
H Grid
I Trans Sidetone
J Mic Audio (Tr 2)
K Key (Trans 2)
L Rec Audio
M Mic Audio (Ext Tr)
N Key (Extern Trans)
2 Rec, 3 trans,(Loop)(C -36,-37.-38)
J-901,-1601,-2601 (12096) To Eq't or Junct Box
A Sel Chan 1
H Key (Tran 2)
O Mic (tran 1 & 2)
B "
" 2
I Key (Extrn Tran)
P Mic (Extrn Tran)
C "
" 3
J Rng/VHF Audio
Q n/c
D "
" 4
K Tel (Junct. Box)
R
E "
" 5
L Sidetone (Trl&2)
S
F Relay (Junct Box)
M Key (Junct Box)
*15
G Key (Tran 1)
N Mic (Junct Box)
J-902,-1602,-2602 (12097) To Eq't or Jun ct Box
A Sens (Range)
D Sens (VHF)
G +LV Source
B Ant/Loop Sw (Rng)
E Hi-Lo Audio (VHF)
H Gnd
C +LV (Range)
F +LV (VHF)
2 Rec, 2 Trans, Loop (C -39)
J-1701 (12096) To Eq't or Junct Box
A Sel Chan 1
H Sel Tran 2
B "
" 2
I n/c
C "
" 3
J +LV (VHF)
O "
" 4
K +LV (Range)
E "
" 5
L n/c
F Mic Key
M Sens (VHF)
G Sel Trans 1
N Audio Hi-Lo (VHF)
O
P
Q
R
S
Sens (range)
Ant/Loop (Range)
n/c
n/c
n/c
J-1702 (12093) To Primary Power Source
A +LV Source
C Gnd
B +LV Source
D Gnd
3 Rec, 3 Trans
J-1801 (12096)
A ARC-5 VHF Ch
B "
"
"
(C-40)
To Eq't or Junct Box
A
H Relay (Junct Bx)
B
I Tel Set
O Tel Out (Extrn)
P +LV to ARC-5 Trans
C "
"
" C
D "
"
" D
E Sel Trans (VHF)
F "
"
(HF)
G "
"
Common
J
K
L
M
N
Sidetone
Rec Tel Out
Key (Extrn Tran)
Key (ARC-5)
Key (Mic)
Q +LV Source
R "
"
S Gnd
J-1802 (12097) To Eq't
A +LV (ARC-5 Rec)
B Sens (ARC-5 Rec)
C +LV (R-11)
Or Junct Box
D Sens (R-11)
E Ant/Loop (R-11)
F +LV (R-19)
G Sens(R-19)
H Audio Hi-Lo (R-19)
1 Rec, Loop (C-48)
J-1802 (12097) To Eq't
A Panel Lights
B Ant/Loop Sw
C Gnd
*16
D +LV to Rec
E Sens
F +LV Source
G n/c
H n/c
1 Rec, 4 Trans (C-56)
J-1801 (12096) To Eq't
A Sel Chan 1
B "
" 2
C "
" 3
D "
" 4
E "
" 5
F Mic In
G Mic (Trans 1)
or Junct. Box
H Mic (Trans 2)
I Mic (Trans 3)
J Key In
K Key (Trans 1)
L Key (Trans 2)
M Key (Trans 3)
N Chan Sel (Trans 4)
O +LV to Eq't
P Sens (Top of Pot)
Q Mic (Trans 4)
R Sens (Pot Tap)
S Whistle Stop
*17
J-1701 (12093) To Eq't or Junction Box
A +LV Source
C Gnd
B Sel Trans 4
D Panel Lights
Junction & Jack Boxes (ARC-5)
Jack Box, Mic/Tel (J-16,-22) *14
J-1201 (9336) To Mic
1 Mic
2 Key
J-1202 (7026) To Junct Box J -17
1 Mic
4 Gnd
2 Audio
5 n/c
3 n/c
6 n/c
System Junction Box (J -17)
J-1301 (6418) To APC-5 VHF Rec
1 n/c
4 Gnd
2 Rec Audio
5 n/c
3 Sens
6 +LV to Rec
3 Gnd
7 Key
8 +LV In *18
7 AVC Ctl
8 n/c
J-1302 (6418) To ARB MHF/HF Rec
1 n/c
4 Gnd
2 Rec Audio
5 CW Gain
3 Sens
6 +LV to Rec
7 CW Shut-off
8 AVC
J-1303(6418) To ARC-5 HF Rec
1 n/c
4 Gnd
2 Rec Audio
5 B-Tel
3 Sens
6 +LV to Rec
7 CW Shut-off
8 n/c
J-1304(6418) To R-4/ARR-2 Rec
1 n/c
4 Gnd
7 CW Shut-off
2 Sens
3 Pitch
5 Rec Audio
6 +LV to Rec
J-1305 (7024) to Modulator
1 +LV Source Out
2 Gnd
J-1306 (7026) To HF Trans
a) ARC-5 Trans
1 Mic
4 Gnd
2 A-Tel
5 Sidetone 1
3 B-Tel
6 Sidetone 2
b) ART-13 Trans
1 n/c
4 Gnd
2 n/c
5 Mic
3 Key
6 Sidetone
8 n/c
3 +LV Source Out
7 Key
8 +LV
7 n/c
8 n/c
J-1307 (6418) Test or as spec.
1 n/c
4 Gnd
2 Audio
5 n/c
3 n/c
6 +LV Out
7 n/c
8 n/c
J-1308 (6418) To ARC-1 or ARC-4
1 +LV
4 Gnd
2 Audio
5 Mic
3 Gnd
6 +LV
7 n/c
8 Key
J-1309 (7024) To Primary Power Source
1 +LV Source In
2 Gnd
J-1310 (7026) To Mic/Tel Jack Box (J -16,-22)
1 Mic
4 Gnd
2 Audio
5 n/c
3 n/c
6 n/c
System Junction Box (J -17)
J-1301 (6418) To ARC-5 VHF Rec
1 n/c
4 Gnd
2 Rec Audio
5 n/c
3 Sens
6 +LV to Rec
3 +LV Source In
7 Key
8 +LV
7 AVC Ctl
8 n/c
J-1302 (6418) To ARB MHF/HF Rec
1 n/c
4 Gnd
2 Rec Audio
5 CW Gain
3 Sens
6 +LV to Rec
7 CW Shut-off
8 AVC
J-1303(6418) To ARC-5 HF Rec
1 n/c
4 Gnd
2 Rec Audio
5 B-Tel
3 Sens
6 +LV to Rec
7 CW Shut-off
8 n/c
J-1304(6418) To R-4/ARR-2 Rec
1 n/c
4 Gnd
2 Sens
5 Rec Audio
3 Pitch
6 +LV to Rec
7 CW Shut-off
8 n/c
J-1305 (7024) to Modulator
1 +LV Source Out
2 Gnd
3 +LV Source Out
J-1306 (7026) To HF Trans
a) ARC-5 Trans
1 Mic
4 Gnd
7 Key
2 A-Tel
3 B-Tel
b) ART-13 Trans
1 n/c
2 n/c
3 Key
5 Sidetone 1
6 Sidetone 2
8 +LV
4 Gnd
5 Mic
6 Sidetone
7 n/c
8 n/c
J-1307 (6418) Test or as spec.
1 n/c
4 Gnd
2 Audio
5 n/c
3 n/c
6 +LV Out
7 n/c
8 n/c
J-1308 (6418) To ARC-1 or ARC-4
1 +LV
4 Gnd
2 Audio
5 Mic
3 Gnd
6 +LV
7 n/c
8 Key
J-1309 (7024) To Primary Power Source
1 +LV Source In
2 Gnd
J-1310 (7026) To Mic/Tel Jack Box (J -16,-22)
1 Mic
4 Gnd
2 Audio
5 n/c
3 n/c
6 n/c
3 +LV Source In
7 Key
8 +LV
System Junction Box (J -17) con't
J-1311 (7025) To Auxiliary Ctl Box (C -39,-48)
1 Audio (ICS)
5 Gnd
2 Audio Buss
6 Mic (MHF)
3 Key (ICS)
7 Mic (VHF)
4 n/c
8 Mic (ICS)
9 Key
10 n/c
11 Key (MHF)
12 +LV
J-1312 (7027) To Main Ctl Box (C -38)
1 Sens (VHF)
7 Gnd
2 Sens (MHF)
8 Key (MHF)
3 Mic (MHF)
9 Key (VHF)
4 Mic (VHF)
10 CW S-O (ARR-2)
5 Mic (ICS)
11 Audio (Pilot)
6 Mic (Pilot)
12 Audio Buss
13
14
15
16
17
18
J-1313 (6418) To RL-7,-9 or Cat ICS
a) RL-7,-9
1 n/c
4 Gnd
2 Audio
5 Mic In
3 n/c
6 +LV
b) Cat ICS
1 n/c
4 Gnd
2 n/c
5 Mic In
3 n/c
6 +LV
Ctl Split, VHF Chan. (J -28)
J-1401 (7025) To Ctl Box C -30,-30A
1 Trans Chan A
5 Gnd
2
"
" B
6 Key
3
"
" C
7 Rec Chan A
4
"
" D
8 "
" B
J-1402 (7026) To VHF Trans (T-23)
1 Trans Chan A
4 Gnd
2
"
" B
5 Trans Chan D
3
"
" C
6 Key
Sens (ARB)
Pitch (ARR-2)
Key (Pilot)
Key (ICS)
Yens (ARR-2)
Audio (VHF)
7 n/c
8 n/c
7 Audio
8 n/c
9 Rec Chart C
10 "
" D
11 Voltage Reg.
12 n/c
7 Voltage Reg.
8 n/c
J-1403 (5577) To VHF Rec (R -28)
1 Rec Chan A
3 Gnd
2 "
" B
4 Rec. Chan C
5 Rec Chan D
6 n/c
Ctl Split, Multi Trans Rack (J -34)
J-1501,-1502,-1503 (9417) To Modulator & Trans Racks '19
1 +LV
5 Sel Trans 3
9 +HV
2 Sel Trans 1
6 "
"
4
10 Osc. B+
3 "
"
2
7 Key
11 Test Relay
4 Gnd
8 P.A. B+
12 P.A. Vscr
Racks
Receiver Racks, Command Set (All Series)
J-6,-7,-601,-602 (5577) To Modulator *6
1 Sidetone 1
3 Gnd
2 A-Tel
4 B-Tel
J-18,-19,-20,-31,-603 (5842) To Rec
1 Gnd
4 CW Shut-off *7
2 Rec Audio
5 n/c
3 Gain Ctl
6 +LV To Rec
J-21,-22,-23,-32,-605 (6418) To Ctl Box
1 +LV Source
4 Grid
2 Rec Audio
5 B-Tel
3 Gain Ctl
6 +LV to Rec
5 Key
6 +LV
7 n/c
7 CW Shut-off *7
8 A-Tel
J-24,-604 (6485) To Primary Power Source
1 +LV Source In
2 Gnd
Trans Racks (SCR-274N,ATA)
J-59 (7025) To Modulator
1 Meter +
5 Gnd
2 Meter 6 Sel Trans 4
3 Key
7 "
"
3
4 +LV
8 "
"
2
J-60 (7023) To Antenna Relay
1 Key
3 Gnd
2 Meter +
4 +LV
J-62,-63,-67,-68 (5842) to Trans
1 Gnd
4 P.A. Vscr
2 n/c
5 Select (Key)
30sc. B+
6 +LV
9 Sel Trans 1
10 P.A. B+
11 Osc. B+
12 P.A. Vscr
5 Meter -
7 P.A. B+
Trans Racks (ARC-5)
J-56 (2674) To Extern Ant Meter
+ Meter +
(blank) Meter J-60 (7023) To Antenna Relay
1 Key
3 Gnd
2 Meter +
4 +LV
J-67,-68,-80,-82 (9296) To Trans
1 +HV
4 Gnd
2 Osc. B+
5 +LV
3 Select (Key)
6 P.A. Vscr
5 Meter -
7 P.A. B+
Trans Racks
J-71 (9417)
1 +LV
2 Sel Trans
3 "
"
4 Gnd
(ARC-5) con't
To Modulator
5 Sel Trans 3
1
6 "
"
4
2
7 Key
8 P.A. B+
9 +HV
10 Osc. B+
11 Test Relay
12 P.A. Vscr
Related Equipment (ARC-5)
R-4/ARR-2 Homing Rec
J-402 (5488) To Rack '21
1 Gnd
4 n/c
2 Rec Audio
5 n/c
3 n/c
6 +LV In
7 n/c
J-104 (6418) To Control Box
1 +LV Source
4 Gnd
2 Sens
5 Rec Audio
3 Pitch
6 +LV TO Rec
7 CW Shut-off
8 Tel (To Rack)
C-2/ARR-2 Control Box for R-4/ARR-2
1 +LV Source
4 Gnd
2 Sens
5 Rec Audio
3 Pitch
6 +LV to Rec
7 CW Shut-off
8 Tel (to Rack)
Related Equipment (Type 12)
TV-10 (CV-431/AR) Transvertor
J4202 (
) To Chan Sel Ctl *23
A Sel Chan 1
E Sel Chan 5
B "
" 2
F "
" 6
C "
" 3
G "
" 7
D "
" 4
H "
" 8
I
J
K
L
UHF/VHF Sel
Whistle-thru
Grid
Hi-Lo Freq Range
J-4203 (
) To Set Ctl *24
A +LV Source
E Key
B +HV In
F VHF Ant Disable
C +HV to VHF
G Sidetone
D Mic
H Whsl-thru (VHF)
I
J
K
L
UHF/VHF Sel
n/c
Gnd
n/c
R-20 Marker Beacon Rec
J-2702 (11905) To Ctl
A +HV to Rec
C Gnd
B Rec Audio
D +LV In
E Relay Out
F n/c
R-22 Rec, Broadcast
J-4803 (
) To Ctl
A +LV to Rec
B +HV to Rec
C +HV to Trans
O Gnd
I
J
K
L
E
F
G
H
Sens
Ant/Loop Sw
Rec Audio
n/c
R-13 (R-445/ARN-30) Type 15 VOR/ILS Rec
J-lO3 ( ) To Equipment Rack *25
1 Gnd
4 Tuning Meter
2 Rec Audio
5 Navig Audio
3 Gain Ctl
6 +LV Source In
J-lO5 (11905) To Trans *2 ,26
n/c
n/c
Grid
n/c
7 +HV Out
A +HV To Trans
B Rec Audio
C Grid
D +LV to Trans
R-34 (R-1021/APN-3OD) Type 15 VOR/ILS Rec
J-2 (12357) To Control
A n/c
H MHz Tuning Ctl
B n/c
I "
"
"
C n/c
J "
"
"
D n/c
K "
"
"
E Local Squelch
L "
"
"
F Squelch Circuit
H Localizer Key
G n/c
N 0.1 MHz Tun'g Ctl
J-3 (11905) To Trans *2
A +HV to Trans
C Gnd
B Rec Audio
D +LV to Trans
J-4 (
) To Rack *25
1 Gnd
4 Tuning Meter
2 Rec Audio
5 Navig Audio
3 Gain Ctl
6 +LV Source
E +HV to Rec
F n/c
O 0.1 MHz Tun'g Ctl
P "
"
"
"
Q "
"
"
"
R "
"
"
"
S Gnd
E +HV to Rec
F Rem. Squelch Ctl
7 +HV Out
Other A.R.C. Equipment
RT-524() VHF Transceiver *27
J-3-(
) Power and Audio *22,28
A Gnd
H Speaker Out
B n/c
J Aux Audio 2 In
C Phone Out
K +LV Out (Sw'd)
D Aux Audio 1 In
L Spkr Sidetone
E Panel Lights
M Mic Key
F n/c
N Aux Audio 3 In
P
R
S
T
U
V
R-836/ARN-59 ADF Rec
J-101 (12426) To Loop Ant
A Loop Input 1
B Loop Input 2
C Gnd
+LV IN (Unsw'd)
RT-524 Audio In
Amp +LV In
Aux Audio 4 In
+LV In To Switch
Mic Input
J-103 (12357) Power & Ctl
A +LV In
H Band III Sel
O AF Plate Out
B +HV2 In (125v)
I 13V, 100~, 0 deg. in P n/c
C +HV1 In (llOv)
J Tel
Q Loop Position
D Modulator Ctl
K Sens
R Loop Relay
E AF Grid In
L BFO Ctl
S Gnd
F Band I Sel
M +/- Plate
G Band II Sel
N -/+ Plate
C-2275/ARN-59 Ctl Box for P-836
J-201 (12357) To Equipment
A n/c
H Band I Sol
O Gain Ctl (AF Pl.)
B Phase 2 Ctl
I BFO Ctl
P Sens
C Band Sel Gnd
J Panel Lights
Q Power Ctl
D n/c
K Loop Position
R Modulator Ctl
E Gain (AF Grid)
L 13v,100~,0/180 deg. S Gnd
F Band III Sel
M 13v,100~,180/0 deg. *29
G Band II Sel
N Loop Relay Ctl
Notes
1
2
3
Only used on .19-.55 & .52-1.5 MHz Rec's
If no transmitter is us ed, jumper pins A & E with wired plug
ABC# 11934
T-15,-16,-17
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Only Rec Audio plus Trans Sidetone
Pins G & H not used in any installation drawings found
J-6,-? (J-601,-602) are identical & either may go to the
modulator. The other is for connecting multiple rec. racks
together as one system.
AVC Ctl when VHF rec (R -28) is installed.
Not on R-28
On M-28 Only
On T-23 Only
Both the same. Allows 2 LF/MF transmitters to connect to 1
antenna tuner
On early control boxes only
Pins 1 & 6 jumpered in control box
Also has JK-48 on a cord and mic & phone jacks
Tran 2 only has 4 channels. Position 5 for tran 2 goes to
pin F rather than pin E.
Proper ident for connector not available yet.
Position 16 selects Tran 3 with no crystal for ICS use.
On J-22,-22() only
All connectors the same and are interchangeable.
No Test Set-ups are included.
MX-2/ARR-2 Wired Plug is required in Ctl Box recept on rack.
This jumpers pins 1 & 6, and 2 & 8 together to allow the
receiver to work from the control box attached to it.
Not an A.R.C.-type connector
Key notch over pin B
Key notch over pin I
Connector similar to ARC# 5488
Not on R-13
'A' suffix freq range is 118.00 -135.95 MHz.
'M' suffix freq range is 136.00 -149.95 MHz.
Pinout shown is from 'A' equipment and is assumed to be
the same as 'M' equipment.
Aux and PT-524 Audio inputs are to internal mixer/amp,
which may be used independently of the rest of the radio.
Pins L & M are switched for different antenna mounts.
The first angle is for belly -mounted antennas and the second
is for top-mounted antennas.
CONNECTOR LISTS
All Command series and Type 12 receptacles are shown on the following pages in numeric
order. Some extra A.R.C. connectors are shown as well where I have information on them.
The receptacles are shown as viewed from the outside. Pin 1 or A is indicated on the
drawings, and the pin identification proceeds from there anti-clockwise. It should be noted
that in many if not all cases, the pins are marked on the wired side of the connectors.
Some crossing between Command and Type 12 connectors is possible as shown in the notes.
(Notes are indicated as in the previous section.) For the most part, Command set connectors
are unkeyed, while the later Type 12, etc ones do have keying ridges. The keying can be
defeated (Files are handy for this.) to allow the later type plugs to be used in the Command set
receptacles, as well as in ones with the same pin arrangement but different keying.
There are other A.R.C. connectors however these aren't shown due to lack of information on
them.
Recept
No Front
Mating Plugs
Ident
Pins View
Cable
Wire
Open
Used On
2674
2
3146
PL-157
5571
18
6962
9585
C-29,-30, ARC-5 Modulator
5577
*1
6
6784
9123
J-28, R-28, All Rec Racks,
PL-151 PL-151A All Modulators
5842
*2
7
5488 (on rear
of Equipment)
6418
*3
8
6485
2
6578
9127
All Rec racks
PL-147 PL-147A
7023
5
6967
9124
All Trans Racks & Ant Relays
PL-156 PL-156A
7024
3
6965
9126
J-17, All Modulators
PL-148 PL-148A
7025
12
C-30,-39,-48, J-17,-28,
6964
9122
SCR-274N & ATA Modulators
PL-154 PL-154A & Trans Racks
7026
8
6966
7027
18
6963
9121
C-38, J-17, SCR-274N & ATA
PL-153 PL-153A Modulators & Trans Ctl Boxes
9296
7
9302 (On rear
ARC-5 Trans Racks
of ARC-5 Trans)
9336
3
-- 9488 --
C-39,-48, J-16,-22, ~IX-19
9417
12
9377
J-34, MD-7,
ARC-5 Trans Racks
9835
2
-- 9818 --
C-27
9849
3
-- 9848 --
TN-60 T-15,-16,-17
11905
*1
6
12151
14051
C-16,-17, R-13,-20,-34,
Type 12 Rec & Trans
12093
4
12372
12375
14052
C-24,-39,-56, Type 12 Tran8
12095
*2
7
(On rear ARN-30 (Type 15) Equipment
Of Rack-mt Eq't) Racks
12096
*4
19
12139
C-42,-43, ARC-5 Trans Racks
Early BC-451's
All Rec Racks, SCR-274N &
ATA Trans Racks
C-2,-26,-42,-43,-125,-744,
6577
9125
SCR-274N & ARA Rec Ctl Boxes,
PL-152 PL-152A R-4, T-23
9121
9589
14320
J-17,-28, T-23, MD-7
C-24,-25,-36,-37,-38,-39,
C-40,-56
C-36,-37,-37,-40,-48,
12097
*3
8
12098
14050
12348
*3
8
Type 15 Eq't Rack
12355
*3
8
C-3436/ARN-30D
12357
*4
19
C-2275 & R-836/ARN-59
C-3436 & R-1021/ARN-30D
Type 15 R-34
12426
3
R-836/ARN-59
12427
2
14321
C-3436/ARN-30D, Type 12 Trans,
Type 15 Eq't Rack
Type 12 Rec's, Type 15 Racks
12
TV-10 (CV-431/AR)
12
TV-10 (CV-431/AR)
12
R-22
NOTES
1
Plugs for receptacles 5577 and 11905 may be used inter changeably if the keying is defeated on the newer plugs.
2
A.R.C. Type 15 receivers may be used in Command set receiver
racks and vice-versa if wiring changes are made to accommodate
the different pinouts.
3
Plugs for receptacles 6418, 12097, 12348, and 12355 may be
used interchangeably if the keying is defeated on the
newer plugs.
4
Plugs for receptacles 12096 and 12357 may be used inter changeably if the keying is defeated. Some caution s hould
be exercised since without the keys there are several ways
to insert the plugs into the receptacles.
SCR-274N to A.R.C. Plug Cross Reference
SCR-274N
Ident
PL-147
PL-147A
PL-148
PL-148A
PL-151
PL-151A
PL-152
PL-152A
PL-153
PL-153A
PL-154
PL-154A
PL-156
PL-156A
PL-157
A.R.C.
Ident
6578
9127
6965
9126
6784
9123
6577
9125
6963
9121
6964
9122
6967
9124
3146
NUMERIC ORDER LISTS
The following lists are divided into two groups. The first is a set of "in type" lists for the
various series from the first sections of this booklet. The second is a list of all the units
previously mentioned for which A.R.C. part numbers were found, and is in numeric order by
that number.
Note that some items not in the equipment lists are listed here. these are 'uncommon units
(such as the VHF SCR-274N units) or detail pieces (like connector caps.) These lists are
therefore more complete than the previous ones and are useful as 'check lists' for these items.
An asterisk used as a suffix to a unit's identifier indicates that there are or may be trailing
letters and that all versions are being referred to. For example, C-30' refers to both the C-30
and the C-30A.
SCR-274N
BC-442 Antenna Relay
BC-450 Ctl Box, 3 Rec
BC-451 Ctl Box, Trans
BC-453 Rec, .19-.55 MHz
BC-454 Rec, 3.0-6.0 MHz
BC-455 Rec, 6.0-9.1 MHz
BC-456 Modulator
BC-457 Trans, 4.0-5.3 MHz
BC-458 Trans, 5.3-7.0 MHz
BC-459 Trans, 7.0-9.1 MHz
BC-473 Ctl Box, 1 Rec
BC-496 Ctl Box, 2 Rec
BC-696 Trans, 3.0-4.0 MHz
BC-938 Ctl Box, HF & VHF Trans
BC-942 Rec, 100-156 MHz
BC-9~6 Rec, .52-1.5 MHz
BC-950 Trans, 100-156 MHz
DM-32 Dynamotor, Rec
DM-33 Dynamotor, Trans
FT-220 Rack, 3 Rec
FT-221 Mount, 3 Rec
FT-222 Mount, 3 Rec Ctl Box
FT-225 Mount, Modulator
FT-226 Rack, 2 Trans
FT-227 Mount, 2 Trans
FT-228 Mount, Trans Ctl Box
FT-229 Mount, Antenna Relay
FT-230 Adapter, Remote Ctl
FT-231 Mount, 1 Rec
FT-232 Mount, 1 Trans
FT-233 Rack, 1 Rec
FT-234 Rack, 1 Trans
FT-235 Mount, 1 Rec Ctl Box
FT-240 Mount, 2 Rec Ctl Box
FT-260 Adapter, Local Ctl
FT-262 Mount, 3 Trans
FT-264 Rack, 4 Rec
FT-276 Rack, 3 Trans
FT-277 Rack, 2 Rec
FT-278 Mount, 4 Rec
FT-279 Mount, 2 Rec
FT-310 Adapter, Power
FT-331 Rack, 4 Trans
FT-332 Mount, 4 Trans
I-84A Meter Unit, Rec Test
I-85A Meter Unit, Trans Test
MC-211 Adapter, Rt Angle Drive
MC-212 Dial, 6.0-9.1 MHz
MC-213 Dial, 3.0-6.0 MHz
MC-214 Dial, .19-.55 MHz
MC-215 Kit, Tuning Shaft
MC-415 Dial, .52-1.5 MHz
PL-192 Wired Plug
RC-54A Test Set-up, Rec
RC-55A Test Set-up, Trans
NAVY
21531
21626
23155
23243
23251
23261
29125
29126
Dynamotor, Rec
Dynamotor, Trans
Ctl Box, 2 Rec
Ctl Box, Trans
Ctl Box, 3 Rec
Ctl Box, 1 Rec
Antenna Relay
Mount, Antenna Relay
50084
50141
52208
52209
52210
52211
52212
52213
Mount, Modulator
Modulator, ARC-5
Trans, ATA, 3.0 -4.0
Trans, ATA, 4.0 -5.3
Trans, ATA, 5.3 -7.0
Trans, ATA, 7.0 -9.1
Rack, 2 Trans
Mount, 2 Trans
MHz
MHz
MHz
MHz
46085
46104
46105
46106
46110
46129
46145
46149
46150
49107
50083
Mount, 2 Rec
Rec, 1.5-3.0 MHz
Rec, 3.0-6.0 MHz
Rec, 6.0-9.1 MHz
Rack, 2 Rec
Rec, .19-.55 MHz
Rec, .52-1.5 MHz
Rack, 3 Rec
Mount, 3 Rec
Adapter, Remote Ctl
Modulator, ATA
52232
52302
52303
52304
52305
52306
52307
52308
52309
62036
Trans ATA, 2.1-3.0 MHz
Trans ARC-5, .50-.80 MHz
Trans ARC-5, .80-1.3 MHz
Trans ARC-5, 1.3-2.1 MHz
Trans ARC-5, 2.1-3.0 MHz
Trans ARC-5, 3.0-4.0 MHz
Trans ARC-5. 4.0-5.3 MHz
Trans ARC-5, 5.3-7.0 MHz
Trans ARC-5, 7.0-9.1 MHz
Adapter, Power
ARC-5
C-24
C-25
C-26
C-27
C-29
C-30*
C-38
C-39
C-42
C-43
C-48
C-125
C-131
C-744
DY-1
DY-2*
DY-8
ID-25
ID-26
ID-2?
ID-28
ID-29
J-16
J-17*
J-22*
J-28
J-33
J-34
MD-7
MT-4
MT-5
MT-7A
MT-62
MT-63
MT-64
MT-65
MT-66
MT-67
MT-68
Adapter, Local Ctl
Ctl, Rem Ant/Loop Sw
Ctl Box 1 Rec, Tunable
Ctl Box 1 Rec, Lock-tuned
Ctl Box HF Trans
Ctl Box HF Trans & VHF Chan
Ctl Box Main
Ctl Box Auxiliary
Ctl Box 1 Rec, VHF
Ctl Box 3 Rec, HF & VHF
Ctl Box Auxiliary
Ctl Box 1 Rec, Tunable
Ctl Head 6 chan, HF Rec
Ctl Box, 1 Rec, Tunable
Dynamotor, Rec, 12v
Dynamotor, Rec
Dynamotor, Trans
Dial, .19-.55 MHz
Dial, .52-1.5 MHz
Dial, 1.5-3.0 MHz
Dial, 3.0-6.0 MHz
Dial, 6.0-9.1 MHz
Jack Box, Mic/Tel
Junction Box, System
Jack Box, Mic/Tel
Junct Box, VHF Chan Split
Wired Plug
Junct Box, Trans Ctl
Modulator
Mount, Ctl Box
Mount, 1 Rec
Rack, 1 Rec
Mount, 2 Rec
Rack, 2 Rec
Mount, 3 Rec
Rack, 3 Rec
Mount, 4 Rec
Rack, 4 Rec
Mount, 1 Trans
MT-69
MT-70
MT-71
MT-72
MT-73
MT-74
MT-75
MT-76
MT-77
MT-78
MT-80
MT-84
MT-98
MT-159
MT-411
MX-19
MX-20
MX-21
MX-22
0-4A
R-23'
R-24
R-25
R-26
R-27
R-28
R-148
RE-2
T-15
T-16
T-17
T-18
T-19
T-20
T-21
T-22
T-23
TN-6
Rack, 1 Trans
Mount, 2 Trans
Rack, 2 Trans
Mount, 3 Trans
Rack, 3 Trans
Mount, 4 Trans
Rack, 4 Trans
Mount, Modulator
Mount, Antenna Relay
Mount, Ctl & Jack Box
Mount, Ctl & Junct Box
Mount, Junct Box
Mount, Ctl Box
Mount, Antenna Tuner
Rack, 1 Rec, 12v
Adapter, Audio
Adapter, Power
Adapter, Remote Ctl
Adapter, Rt Angle Drive
0sc, Lock-tuned Rec Tune
Rec, .19-.55 MHz
Rec, .52-1.5 MHz
Rec, 1.5-3.0 MHz
Rec, 3.0-6.0 MHz
Rec. 6.0-9.1 MHz
Rec, 100-156 MHz
Rec, .19-.55 MHz
Antenna Relay
Trans, .50-.80 MHz
Trans, .80-1.3 MHz
Trans, 1.3-2.1 MHz
Trans, 2.1-3.0 MHz
Trans, 3.0-4.0 MHz
Trans, 4.0-5.3 MHz
Trans, 5.3-7.0 MHz
Trans, 7.0-9.1 MHz
Trans, 100-156 MHz
Antenna Tuner
A.R.C. Equipment
A-12
B-13
C-16
C-17
Antenna, VHF
Converter, VOR/ILS
Ctl Box R-ll Rec
Ctl Box R-15 Rec
J-12
J-13
J-15
L-10
Junction
Junction
Junction
Antenna,
Box, 32 pos, 12v
Box, 32 pos, 24v
Box, 56 pos, 24v
Loop
C-18
C-24
C-25
C-26
C-36
C-37
C-38
C-39
C-40
C-48
C-56
C-81
C-88
D-10*
DV-10
Type 15
E-14
H-19
J-10
Ctl Box Loop Heading
Ctl Box 3 Rec.2 Trans, Loop
Ctl Box 3 Trans
Ctl Box R-10 Rec
Ctl Box 2 Rec,3 Trans, Loop
Ctl Box 2 Rec, 3 Trans
Ctl Box 2 Rec, 3 Trans
Ctl Box 2 Rec,2 Trans, Loop
Ctl Box 3 Rec, 3 Trans
Ctl Box R-11 Rec, Loop
Ctl Box R-19 Rec, 4 Trans
Ctl Box R-34 Rec
Ctl Box R-34 Rec
Dynamotor
Dynaverter Power Supply
Rack, Type 15 Rec & Conv
Test Set, Rec & Trans
Jack Box, Mic/Tel
M-11
M-12
M-13
M-18
M-19
P-10
P-11
R-10*
R-11*
R-13
R-15
R-19
R-20
R-22
T-13*
Mount, 1 Rec
Mount, 1 Trans
Mount, Ctl Box
Mount, Ctl Box
Mount, Ctl Box
Power Supply, Trans Test
Power Supply
Rec, .52-1.5 MHz
Rec, .19-.55 MHz
Rec, 108-136 MHz, Type 15
Rec, 108-136 MHz
Rec, 118-148 MHz
Rec, 75 MHz, Fixed-tuned
Rec, .52-1.5 MHz
R-34
Rec, 108-126.9 MHz,
T-11*
Trans, 118-132 MHz
Trans, 132-148 MHz
A.R.C. Part Numbers
1943 Cover, For Recept 2226
2226 Recept, Power Adapter
2674 Recept, 2-pin, 7/8"
3146 Plug, 2-pin, PL-157
5005 Receiver, -46104
5006 Receiver, -46105
5007 Receiver, -46106
5009 Transmitter, -52208
5010 Transmitter, -52209
5011 Transmitter, -52210
5012 Transmitter, -52211
5013 Modulator, -50083
5014 Control Box, BC-450,-23251
64
5017 Ant. Relay,BC-442,-29125,RE-2
5018 Rack, FT-277,-46110,MT-63
5019 Rack, FT-264,MT-67
5020 Rack, FT-226,-52212
5168 Dynamotor, DM-33,-21626,DY-8
5319 Cover, 1-1/8" Recept
5488 Plug, 7-pin,On Rack-mt eq't
5571Recept, 18-pin, 1-5/8"
5577 Recept, 6-pin, 1-1/8"
5694 Mount, FT-278,-46085,MT-62
5842 Recept, 7-pin,For Rack-mt eq't
5950 Receiver, -46145
6051
6052
65
6053
6054
6090
6151
6357
6418
6433
6434
Dial, MC-214,ID-25
Dial, MC-415,ID-26
Dial, MC-213,ID-28
Dial, MC-212,ID-29
Rack, FT-331
Tuning Shaft Kit, MC -215
Rt-angle Adaptor,MC-211,MX-22
Recept, 8-pin, 1-1/8"
Adapter, FT-230,-49107,MX-21
Adapter, FT-260,C-24
7023
7024
7025
7026
7027
7043
7053
7054
7056
7057
7058
7059
Recept, 5-pin. 1-1/8"
Recept, 3-pin, 1-l/8
Recept, 12-pin, 1-5/8"
Recept, 8-pin, 1-1/8
Recept, 18-pin, 1-5/8"
Control Box. BC-473,-23261
Mount, FT-235,MT-4
Mount, FT-222,MT-98
Mount, FT-229,-29126
Mount, MT-159
Mount, FT-225,-50084
Mount, FT-231,MT-5
7060 Mount, FT-221,-46150,MT-
7061 Mount, FT-232,MT-68
7062 Mount, FT-227,-SZ213,MT-?O
7063 Mount, FT-262,MT-72
7064 Mount, FT-332,MT-74
7065 Mount, MT-77
7067 Mount, MT-76
7083 Mount, FT-228,MT-80
7095 Control Box, BC-451,-23243
7314 Control Box, C-29
7369 Rec Test Panel, 1 -84A
7491 Knob
7507 Rack, FT-234
7509 Rack, FT-233,MT-7A
7535 Dial, ID-27
7537 Rack, FT-220,-46149,MT-
7594
7595
7596
7632
7633
7634
7544 Trans Test Panel, 1 -85A
7591 Modulator, BC-456
Receiver, BC-453
Receiver, BC-454
Receiver, BC-455
Transmitter. BC-457
Transmitter, BC-458
Transmitter, BC-459
6485
6546
6577
6578
6743
6767
6784
6831
6962
6963
6964
6965
6966
6967
Recept, 2-pin, 1-1/8"
Control Box, BC-496,-23155
Plug, 8-pin, Cable, PL-152
Plug, 2-pin, Cable, PL-147
Knob, MC-236,MC-237
Wired Plug, PL-192,J-33
Plug, 6-pin, Cable, PL-151
Mount, FT-240
Plug, 18-pin, Cable
Plug, 18-pin, Cable, PL-153
Plug, 12-pin, Cable, PL-154
Plug, 3-pin, Cable, PL-148
Plug, 8-pin, Cable
Plug, 5-pin, Cable, PL-156
7638 Rack, FT-276
7777 Dummy Antenna, A -61A
7839 Receiver, -46129
7916 Transmitter, -52232
7918 Rec Test Set-up, RC-54A
7919 Trans Test Set-up, RC-55A
A.R.C. Part Numbers. Con't
9074 Adapter, FT-310.-62036.MX-20
9121Plug.18-pin,Open-wire,PL-153A
9122 Plug,12-pin.0pen-wire,PL-154A
9123 Plug,6-pin. Open-wire,PL-151A
9124 Plug,5-pin. Open-wire,PL-156A
9125 Plug.8-pin,Open-wire.PL-152A
9126 Plug.3-pin. Open-wire.PL-148A
9127 Plug.2-pin. Open-wire.PL-147A
9202 Rack, MT-411
9296 Recept, 7-pin,For ARC-5 Trans
9302 Plug, 7-pin, On ARC-5 Trans
9306 Rack, MT-69
9307 Rack, MT-71
9308 Transmitter, T-18
9309 Transmitter, T-19
9310 Transmitter, T-20
9311 Transmitter, T-21
9312 Transmitter, T-22
9313 Modulator, MD-7
9315 Transmitter, T-15
9316 Transmitter, T-16
9317 Transmitter, T-17
9336 Recept,3-pin,7/8",key-up
9369 Oscillator. 0-4A
9375 Cover, 7/8" Recept
9377 Plug, 12-pin, Cable
9417 Recept, 12-pin, 1-5/8"
9451 Mount, MT-78
9488 Plug, 3-pin, Key up
9554 Knob/cap
9556 Trans Test Panel
9558 Trans Test Set-up
9562 Junction Box, J-34
9584 Plug, 12-pin, Open-wire
9585 Plug, 18-pin, Open-wire
9593 Rack, MT-73
9594 Rack, MT-75
9595 Adapter, MX-19
9601 Control Box. C-26
9602 Receiver. R-23
9603 Receiver, R-24
9604 Receiver. R-25
9605 Receiver, R-26
9821
9835
9848
9849
9850
9867
9901
9902
9903
9904
9905
9907
9910
9911
Plug. 8-pin. Open-wire
Recept. 2-pin. 7/8". Key lt
Plug. 3-pin, Key left
Recept, 3-pin. 7/8". Key lt
Control Box, C-27
Jack Box. J-22
Control Box, C-39
Control Box, C-48
Junction Box. J-17*
Mount, MT-84
Jack Box, J-16
Jack Box, J-22A,B
Control Box, C-30A
Control Box, C-125
10007
10008
10009
11905
11934
12093
12095
12096
12097
12125
12139
12296
12348
12355
12357
12372
12426
12427
14050
14051
14052
14320
14321
14480
14482
14588
Receiver, R-23A
Receiver. R-148
Dynamotor. DY-2B
Recept,6-pin,l-1/8",Key up
Wired Plug
Recept. 4-pin, 7/8",Key up
Recept, 7-pin,For Rack-mt, eqt
Recept,19-pin,l-5/8".Key up
Recept,8-pin,l-1/8",Key up
12098 Plug.8-pin,Cable,Key up
Plug.6-pin,Cable,Key up
Plug.19-pin,Cable,Key up
Wire Antenna Kit
Recept,8-pin.l-l~8",Key rt
Recept,8-pin,l-1/8",Key lt
Recept,19-pin,l-5/8",Key lt
Plug,4-pin.Cable,Key up
12375 Plug,4-pin,Cable,Key up
Recept,3-pin,7/8",Key up
Recept,2-pin,7/8",Key up
Plug,8-pin,Open-wire,Key up
Plug,6-pin. Open-wire, Key up
Plug.4-pin. Open-wire, Key up
Plug,19-pin,Open-wire. Key up
Plug.2-pin,Open-wire.Key up
Dynamotor, D-10A(12v)
Dynamotor, D-10A(24v)
Cover, 1-1/8" Recept
9606
9607
9609
13A
9610
9808
9818
Receiver. R-27
Antenna Tuner, TN -6
Junction Box, J-28
14589 Cover, 7/8" Recept
15392 Capacity Plate for T -13
15900 Capacity Plate for T -
Control Box, C-38
Cover, Ant/Loop Sw Ctl
Plug, 2-pin, Key lt
QUICK & DIRTY CONNECTIONS
There has been in the past three decades, a virtual plethora of articles on the conversion of the
Command (and later, the Type 12 et al) radios. These have, over that span, covered every
reason- able (and I suppose an occasional unreasonable) use that these units might have.
However these sources are no longer available which leaves the current user with a minor
disadvantage, In order to at least partially fill the information gap, following are a few simple
hook-ups (not really conversions in the strict sense of the term) which will get the radios
working with a minimum of fuss and bother. A couple of wiring diagrams are shown at the
end to aid where the descriptions are lacking in clarity. The over-all result is essentially a
starting point from which you may launch your own ideas.
Except for the Command transmitters and the R-836/ARN-59, the units all will run form a
power supply good for 24v at 1.5 to 2 amps and around 250v at 80-100 ma. To use the
transmitters and transverter, the low voltage should be rectified and well filtered, although
there's no reason this cant be done only where it's , necessary.
Probably the best supply for these units is the one Fair Radio has. This is not only a power
supply, but also has a speaker, phone jack, gain control and BFO switch (which can be used
for other things as we'll see later.) The cabinetry is nice and there is enough room inside for
extra goodies should they be desireable,
Another route is to get a dynamotor and remove everything from the base except the plug and
snap-slides. A very neat power supply can now be built on the base so the whole shebang fits
in the old dynamotor space. The Fair #818 transformer was designed to run the Command sets
and is perfect for this.
Now that we've got power, let's see what happens .......
Command Receivers
These are among the easiest receivers in the surplus market to get running. If the dynamotormount power supply is used, BFO and gain controls plus a phone jack must be added. These
can be brought out the front from the adapter well connector (Don't forget to keep pins 6 & 7
jumpered or the tubes don't get nice and warm!) although an extra wire for the receiver audio
will have to be pulled to an unused pin. Alternatively they can be brought out the rear
connector without any changes. The gain control is a simple 50k-ohm pot to ground and the
BFO control is a SPST switch to ground with the closed position being 'OFF'.
While a phone jack is still need (and easily added), capturing a C-24 or FT-260 local control
adapter makes all this bunches easier. If one isn't handy, a little careful layout can be used to
make one from a remote control adapter. By squeezing a bit and careful parts selection, a
phone jack can be added thus going A.R.C. one better!
If a local tuning knob isn't available, a radio-TV push-on knob, a piece of tubing pressed over
the spline, or whatever else you can find that will turn the shaft is just fine for tuning. If you
can get a piece of shaft with one good end (or just the ends from a shaft kit) then a knob can
be fitted to the end of the inner piece and locked in place like the local knob is. The bottom
line is 'Use whatever works for you.'
One note- All the sets I've had were wired for 600 ohms, how- ever some of the early units
had a high-impedance tap as well. It may be wise to check your radio to see how it's wired if
you have one of them.
The LF (.19-.55 MHz) receivers make nice add-on units for receivers having an IF in that
range and are suffering from a lack of sensitivity. Simply wrap a piece of insulated wire
around the input lead to the grid of the first IF stage and connect the other end to the antenna
post if the LF receiver. Tune the LF receiver to the IF of the other, fire up both and listen on
the audio output of the add-on. The selectivity can be sharpened by removing the covers form
the IF cans on the LF unit and pulling the fiber rods up. Don't get too 'dedicated to this
process though- there is a stop and the rods do break! The selectivity can be set by adjusting
the rods to suit your needs, although all the way up is beautiful for CW. This operation is
known as a 'Q-5er* and has been around for quite a while. But, old as the process is, it still
works very nicely.
Type 12 Receivers
These are about the same to convert as the Command sets with the only complication being
the lack of a dial. This has been covered by Fair very nicely in the form of a BC-473 control
box fitted with an adapter to mount on the front of the receivers. This has the advantage that a
gain control plus a switch that can be used for the Audio Hi-Lo control on the VHF units are
already on the box.
To use the rear-mounted power supply, pins A & E of the top connector have to be tied
together to get B+ from the power supply to the receiver. The BC-473 controls can be used by
connecting the lower right-hand receptacle to the one on the box- pin A to 2, C to 4, and E to
3. By connecting pin B to 7 and putting a 1000 ohm resistor from pin 7 to ground in the box
or pin B to ground in the receiver (leaving the other wiring on the pin used intact) the Audio
Hi-Lo circuit will work. Otherwise, pin B must be grounded. Hi audio will be with the BFO
control in 'MCW'. A little paint, patience and a signal source will handle the dial recalibration although for the R-11 it's not necessary.
To use the Fair unit, remove the wire from pin F of the lower right connector and move the
wire from pin E of the upper one down to the pin just emptied. This puts the receiver B. on
the lower connector and allows it to be used for everything. Using the pin-out for this
connector (remembering the change just suggested) and the one for the rear of a Command
receiver, the cable from the power/control unit can be modified to work with these receivers.
The Audio Hi-Lo line will still need the 1000 ohm resister.
The R-11 can be used as a ~-5er however the main receiver's BF0 will have to be used since
the Type 12's don't have one. Alternatively, one could be installed using the parts and circuit
from a Command receiver or a semiconductor circuit could be added to handle this. Some
squeezing may be necessary, but use your imagination.
Other Receivers
Using the R-13 is sort of a cross between the Command boxes and the Type 12's. To get
power and control to it, the rear connector has to be used, however the tuning is like the Type
12'e. While either power supply mentioned before can be used, the Fair unit is mere practical
since the other requires set modification to get the controls and audio output in. There is room
on the front for the pot and jack so if this is what you want there's no problem there. Note that
if the R-445 is being used, pins A & E of the front connector have to be jumpered to get B+ to
the receiver if the rear-mounted power supply is being used.
The R-20 is easy.., it's fixed tuned at 75 MHz and, unless one likes listening for marker
beacons, requires some pretty bag modifications to use. This is a good one to play with since
there is potential in it to be something else, although the only thing that comes to mind is a
monitor for some favored frequency like on 6 meters which isn't that too awful far away.
The R-22 likewise is easy, but for a different reason. This set is much like the R-10 but with
only one instead of three receptacles. By following the pinouts, everything mentioned on the
Type 12 sets applies to this one as well.
A real challenge is presented by the R-34. This unit uses a motor driven crystal select system
to tune to the desired frequency. (It also requires that the low voltage be dc and not ac.) Since,
to select the proper frequency, it uses 10 wires in a non-redundant code (five each for MHz
and tenth MHz) the original control box is necessary. There are three squelch options- none
(pin F of either front connector grounded), internal(Jumper between pin E and pin F of the big
receptacle, J-2) or external (a 100k ohm pot to ground from pin F of either receptacle. ) Gain
and audio are handled as in the Type 12 receivers.
One of the newer A.R.C. receivers to hit the market is the R-836/ARN-59. This is a
modernized ARN-6 or LM-26 and is smaller and lighter than either of those anchors. Power is
easy- +24v at about 1-1 1/2 amps and +110 & +125v for B+. The latter may, without any
major detriment, be tied to the +110v line thus simplifying the power supply. The volume
control is a 100k ohm pot with one end grounded, the other tied to the AF Plate lead, and the
tap to the AF Grid line. The RF sensitivity control is a 50k ohm pot to ground, or the line may
be grounded directly. Like the Command sets, the BFO control is grounded to turn the BF0
off. Band selection is by grounding the proper pin. For just listening, pins D,I,M,N,O, Q, & R
may be ignored.
The original control box is suggested for this unit not only for the controls but for the threeband dial. A little ingenuity and some tin-bending can be used to make a false front for the
receiver to mount the control box as well as the phone jack, thus making a neat, compact unit.
Command Transmitters
Like the Command receivers, these are very easy to get working in their original form, and
accept modification very nicely. They make neat little single-band rigs that will load
practically any- thing with a short wire (up to 50') being their 'specialty'.
The power needed is 24v mt about 1« amps (filtered dc if the relays are to be used), around
+200v at about 10ma of stiffly regulated dc for the oscillator B+, 250v at around 15ma for the
P.A. screens and up to 600v at up to about 200ma for the P.A. B+.
Keying the 'Select' line will result in full break-in operation since the select relays connect the
oscillator to its B~, ground the P.A. cathodes, and attach the output to the antenna. This gets
noisy for a home environment, although in a prop-driven bomber, no one seemed to notice.
Tying the Osc. B+ directly to the oscillator, and the cathodes to a key jack will result in a
quieter operation, although break-in is no longer possible. An rf choke should be put between
the cathodes and the jack, and bypass caps (.01 to .001uf at 1 kv) on both ends of the choke.
There's very few 'bad habits' in these rigs (click, chirp, etc) and those that are present may be
cleaned up by normal techniques.
Tune-up is simple. Tune to the desired frequency, apply high voltage, and tune the loading &
coupling controls for maximum output. An antenna relay's handy here- the output meter's on
it.
The 4-5.3 MHz transmitters will go down to 80 meters by closing the cap under the cover
between the P.A. tubes and the rest. Like- wise the 5.3-7 MHz boxes will go to 40 meters by
opening the cap, or by lopping a few turns off the oscillator coil, as you may wish. In both
cases, the dial will have to be recalibrated and the P.A. 'fixed' cap will have to be re-adjusted
for maximum output. The tracking won't be as good, but over short segments (like the Novice
sub-bands) it's close enough that re-trimming isn't needed. A short extension and knob can be
put on the cap's shaft to juggle it if you like, but if the initial tune-up is in the center of the
band, then it shouldn't be needed for narrow segments.
In the cathode keyed version, there's a slight drift in the oscillator. Typically, mine have
slipped down about 100 cycles in around 10-20 minutes then stayed put. I haven't tried relay
keying however it may be more stable since the oscillator tube never really gets a chance to
get hot like it does on keying the P.A. cathodes.
By removing the 'eye'-tube and the calibration crystal, there is enough room to add practically
anything you'd like to build in. Buffers, multipliers, keyers, and a whole bunch more have at
one time or another been put in, so have fun. This is an excellent 'imagineering' machine.
Type 12 Transmitters
These little boxes, like the Command transmitters, are pretty neat by themselves or as the
basis for projects. They run from the same supply as the Type 19 receivers and are very easy
to use as is for local rag-chewers, although they are AM units.
The T-13 hits 2 meters directly however the T-11 misses by a bit. This can be easily fixed by
lopping a few turns off of the tuned circuit coils and replacing the 50pf cap on the oscillator
tank with a 35Pf one. Note that these transmitters double in the final which can lead to
extensive official correspondence that's really not pleasant. This can be avoided by careful
tuning and/or a filter in the output circuit...with the preferable choice being both. The units
will operate over a 2 MHz bandwidth without re- tuning which is rather convenient
considering the current band arrangement.
The low voltage has to be dc and well filtered. The relays use this, but can be defeated.
However the mic. circuit also uses this to get dc to the mic. (They use carbon mic's) and,
unless you like hum on your audio or convert to another input circuit, this makes filtering a
'must do'
The basic hook-up is simple-wedge a channel relay closed and plug in a crystal (6 or 8 MHz)
for the proper frequency, plug in a mic., put power on the appropriate pins and you're in
business.
Using these with the R-19 is equally easy. If the rear-mount power supply is being used,
connect the top receptacle of the receiver to the 6-pin on the transmitter pin for pin.(Pin F can
be omitted.) With the outboard supply, the only difference is that pin A on the transmitter will
go to the power supply +HV output and pin E will go to pin E of the upper or pin F of the
lower receptacle dependant on whether or not the receiver was altered as previously
discussed. For frequency selection, relays can be wedged, relays can be removed and a 5 (or
more) position rotary switch installed in their place, or they can be operated as they were
intended.
The T-11 unconverted and a low power HF SSB rig can become the basis for a 2 meter SSB
rig with the T-11 providing the VHF input to a mixer, Likewise the T-13 (or a converted T11) can drive a DSB power amp, for 'almost SSB'. The possibilities are endless.
While these units were designed for AM, that mode of operation is slowly disappearing (darn
it). However there's nothing saying they can't be used for CW or, by modulating a varactor (or
by some other method,) FM. Like the Command transmitters, these are nice basic units that
leave a lot of room to play in.
Other Units
For local rag-chewing on 220 MHz, the TV-10 (a.k.a. CV-431/AR) is a very nice basic unit.
As is it works with an R-19, but won't quite hit 220 without some minor alteration.
The receiving converter has no rf stage, just a band-pass filter followed by a mixer. The local
oscillator is at ll0 MHz and uses the 7th overtone of the crystal, The transmitter triples in the
final, which (like the Type 12's) implies careful tuning and filtering to cure any 'bad habits'.
Like the Type 12's, this is a good 'project starter' unit.
Using the transmitter is just like on the Type 12 boxes- put in a crystal, plug in a mic., put
power to it and let 'er rip. The 108-136 MHz receivers will work with the converter with the
original ll0 MHz local oscillator however the bottom couple hundred kHz will be covered up
by the oscillator. One way around this is to use a 100 MHz 1.o. and either frequency range
receiver (the input will be the dial plus 100, which is handy) or use a different over- tone of
the oscillator. (I've seen one reference that says this works without any surgery and another
that says it doesn't: All I can suggest is that you try...it can't hurt')
The TV-10 and the R-19 (or other receiver) will fit the Command receiver racks nicely with
only minor modification. The TV-10 and Type 12's require that the mounting angle on the
front of the receiver be removed and some 'points' like on the Command and Type 15
receivers be mounted in the outboard holes from the angle mounting screws. (A couple of
screws mounted so they stick out far enough that the locking 'ears' can grab them will also
work.) The receptacles at the rear of the rack bays have to be removed, or rewired in the case
of a Type 15 receiver. The boxes will now slide in and lock into the rack bays like they were
designed to do it.
By installing a stop in one bay of a three-bay rack, a VHF transmitter (properly equipped with
'points') can be mounted in addition to the above set-up making a very nice, neat VHF/UHF
installation for local work. It can be tucked into a corner and remote controlled more or less as
designed with very little effort. A slightly rewired C-56 will do very nicely for the control side
with a small panel added to handle to audio and/or key jacks.
If you have no serious objections to 50 kHz crystal-controlled channel spacings, the RT-524M
is a very sweet little rig. Only needing about 6 amps of +24v power, this is a quick way to get
on 2 meters AM with no bad habits. Crank the power into the switched or unswitched inputs
and the amplifier input, hook-up a mic and some phones, put an antenna on it and it works.
Close examination of the antenna connectors in back will reveal that one's not tied to
anything...and it mates to the other. By removing the 'dummy' and soldering a piece of coax to
it gains you an instant match to an uncommon connector. (How often dc you find unusual
connector that come with their own mates these days?)
This rig has a really cute feature, that being that the audio amp may be run independently
from the rest of the radio. The 'RT- 524' input comes from the phone output of the radio. The
auxiliary inputs can come from up to four other radios, and go, with the 'RT- 524' input to a
resistive mixer, then to the audio amp. This is rather nice when one has a multi-radio
installation and only wants one audio source to jack into...just like in an airplane.
While moving the transmitter around without a new crystal bank is tough, the receiver can
feed a tunable IF (like a Command 1.5-3 MHz receiver) since the final IF is 2 MHz. This will
allow between the channel listening as well as give a BFO should CW be desirable. The
transmitter may be FMed by the 'modulated varactor' or any other method you like, or may be
used as the driver for a DSB power amp. Again, it is a good unit as is or as the starter for a
bigger project.
SOME RANDOM NOTES
The foregoing has been the just the briefest outline of what can be done with these units.
Detailed conversions have been avoided since they are up to the users and no two will want to
do the same things or have the same 'junk boxes'. Research (another word for raiding the
magazine shelf or the memory of a ham who has been in the game for a while!) will reveal a
few more and probably answer any points you may have on these sets. In any event,
experiment. Play with the boxes and enjoy them They Are Fun.
The voltages shown for the Command receiver B+ and the P.A. B+ for the Command
transmitters are maximums. Going above them is likely to result in some rather unusual odors
as components express their displeasure at the excess. The Type 12 and 15 units can go a bit
higher, around 275-285 volts, but above that get very shaky. On the other hand, the Command
receivers will still operate with as little as 100 volts of B+ and the transmitters will go down
to about 250 volts and still work (with attendant reduction in the screen voltage, naturally!)
While everything presented has been aimed more or less at the amateur, there are other uses.
The LF receivers can be used to monitor the weather reports on the aviation beacons in that
range and I suspect will tune down to the 160-190 kHz band without too much bending. The
VHF receivers may be used to monitor air traffic since they are COM or NAV/COM units. If
one has an RT-524A, it may still be useable in aircraft (the question being in the type
certification) but as a 360 channel monitor it's very nice. The high- altitude en-route traffic
can be hit the same way as discussed in the section on the RT-524M- i.e., with a tunable IF to
cover the new 25 kHz channels.
Military air traffic can be monitored with a TV-l0 and an R-19 if you're close to an
installation. The lack of an rf stage makes for not so very good sensitivity so coverage over
any appreciable distance is not too likely. Foreknowledge of the local frequencies is a must, as
is patience. Military transmissions are brief and infrequent...or they're supposed to be.
The Fair type 818 transformer is being (or has been) replaced by a new and more versatile
one. This is the number XM-108 trans- former, which has a center tap on the 24 volt winding
plus a 6 volt winding as well. This allows the 12 volt radios to be used with the same
transformer by a simple power supply alteration. The new one is shown in the drawings
following this section.
There are other uses for the sets. As I said before, the limiting factors are budget, junque-box,
and imagination.
Enjoy.
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