MICROWAVE COMMUNICATION EQUIPMENT INSTRUCTIONS TYPE CW-20A/AW (MM-20A/AW) AND TYPE MM-26A /AW MICROWAVE RELAY STANDBY SWITCHOVER EQUIPMENT

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP79T01049A002600030003-7
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 60
• Document Creation Date: December 12, 2016
• Document Release Date: March 6, 2000
• Sequence Number: 3
• Content Type: REPORT

Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030003-7
MICROWAVE COMMUNICATION EQUIPMENT
INSTRUCTIONS
Type CW-20A/AW
(MM-2011/AW)
und
Type MM-26A/AW
Microwave Relay
Standby Switchover, Equipment
RADIO CORPORATION OF AMERICA
COMMUNICATION PRODUCTS DEPARTMENT, CAMDEN, N. J.
PRINTED IN U. S. A.
iB-24978-1
DU 525-567-5/8
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FIRST AID
WARNING!
Operation of electronic equipment in-
volves the use of high volLaRes which are
dangerous to life. Operating personnel
must at all times observe all safety regu-
lations. Do not change tubes or make ad-
justments inside the equipment with volt-
age, supply on. Under certain conditions
dangerous potentials may exist in circuits
with power controls in the off position
due to charges retained by capacitors. etc.
To avoid casualties. ALWAYS DISCHARGE AND
GROUND CIRCUITS PRIOR TO TOUCHING THEM.
ABOUT FIRST AID
Personnel engaged in the installation,
operation and maintenance of this equip-
ment or similar equipment are urged to be-
come familiar with the following rules
both in theory and in the practical ap-
plication thereof. It is the duty of
every radioman to be prepared to give
adequate First Aid and thereby prevent
avoidable loss of life.
FIRST DEGREE BURN
SKIN REDDENED. Temporary treatment--Ap-
ply baking soda or Unguentine.
SECOND DEGREE BURN
SKIN BLISTERED. Temporary treatment--Ap-
ply baking soda, wet compress, white pe-
troleum Jelly, foille jelly, olive oil, or
tea.
THIRD DEGREE BURN
FLESH CHARRED. Temporary treatment--Ap-
ply baking soda, wet compress, white pe-
troleum Jelly, or foille spray. Treat for
severe shock.
BACK PRESSURE ARM LIFT METHOD
OF ARTIFICIAL RESPIRATION
(Courtesy of the American Red Crusts)
I. Position of the subject (see Fig. II
Place the subject In the face down. prone
position. Bend his elbows and place the
hands one upon the other. Turn his face to
one side. placing the cheek upon his hands.
2. Position of the operator (See Fig. 2)
Kneel on either the right or left knee at
the head of the subject facing him. Place
the knee at the side of the subject's head
close to the forearm. Place the opposite
foot near the elbow. If it is more com-
fortable, kneel on both knees. one on
either side of the subject's head. Place
your hands upon the flat of the subject's
back in such a way that the heels lie just
below a line running between the armpits.
With the tips of the thumbs just touching,
spread the fingers downward and outward.
3. Compression phase (See Fig. 3)
Rock forward until the arms are approxi-
mately vertical and allow the weight cf
the upper part of your body to exert slow.
steady, even pressure downward upon the
hands. This comes air out of the lungs.
Your elbows should be kept straight and
the pressure exerted almost directly down-
ward on the back,
I. Position for expansion phase (See Fig. 4)
Release the pressure, avoiding a final
thrust, and commence to rock slowly back-
ward. Place your hands upon the subject's
arms just above his elbows.
5. Expansion phaee (See Fig. 5)
Draw his arms upward and toward you. Ap-
ply just enough lift to feel resistance
and tension at the subject's shoulders. Do
not bend your elbows, and as you rock
backward the subject's arms will be drawn
toward you. Then lower the arms to the
ground. This completes the full cycle.
The arm lift expands the chest by pulling
on the chest muscles, arching the back,
and relieving the weight on the chest.
THE CYCLE 5HOuLD DE REPEATED 12 riMES
PER m/NurE AT ? SIEADr, uNIFORm RATE. THE
COMPRESSION AND EXPANSION PHASES SHOULD
OCCUPY ABOUT EQUAL TIME. THE RELEASE PE.
RioDS REIN OF miNIMUM Th./RATION.
Additional related directions:
It is all important that artificial res-
piration, when needed. be started quickly.
There should be a slight inclination of
the body in such a way that fluid drains
better from the respiratory passage. The
head of the subject should be extended,
not flexed forward, and the chin should
not sag lest obstruction of the respira-
tory passages occur. A check should be
made to ascertain that the tongue or for-
eign objects are not obstructing the pas-
sages. These aspects can be cared for
when placing the subject into position or
shortly thereafter, between cycles. A
smooth rhythm in performing artificial
respiration is desirable. but split-second
timing is not essential. Shock should re-
ceive adequate attention, and the subject
should remain recumbent after resuscita-
tion until seen by a physician or until
recovery seems assured.
FIGURE I
FIGURE 2
FIGURE 3
FIGURE
FIGURE 5
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NO ICE
This book contains instructions for standby switch-
over stations using Terminal Switchover Equipment
MI-31022-B or MI-31022-C and Repeater Switch-
over Equipment MI-31021-B or MI-31021-C. Al-
though the material is presented in terms of
MI-31022-B and MI-31021-B, all the informaan
contained in this book can be applied as well to
switchover equipment MI-31022C and MI-31021-C
with the following exceptions: Figures 19, 21 and
32 apply to MI-31022-B only and Figures 19A, 21A9
and 32A apply to M1-31022-C only. In all other
places in the book, with the above exceptions, where
MI-31022-B is mentioned it can be replaced by
MI-31022-C and MI-31021-B can be replaced by
M1-31021-C.
A' 3
The MI-31022-B, -C and MI-31021-B, -C switch-
over equipment may also be used with MM-26A sta-
tion equipment as well as with CW-20A (MM-20A)
station equipment. A standard 'CW-20A (MM-20A)
station becomes an MM-26A station by using Trans-
mitter MI-31007 or MI-31132-2, Receiver/Modu,
lator MI-31102, and Duplex Filter MI-31113 in
place of Transmitter MI-31490 or MI-31132-1, Re-
ceiver/Modulator MI-31491 and Duplex Filter MI-
31497. All later versions of any of the associated
CW-20A (MM-20A) and MM-26A basic equipment
units may be used interchangeably with the units de-
scribed in this book. For example, Transmitter
MI-31132-1 (see figures 22 and 27) is directly inter-
changeable with Transmitter MI-31490 in CW-20A
(MM-20A) station equipment.
TABLE QF CONTENTS
Subject Page
CW-20A (MM-20A) List of Equipment 5
Technical Data 8
Description 10
General 10
Terminal Switchover Equipment MI-31022-B 11
Controls 12
Functional Analysis 12
25
26
26
Repeater Antenna Switching Unit MI-31029-13 39
Standby Lockout Circuit 39
Functional Analysis ' 39
Installation 40
Initial Adjustment 44
Operation 56
Maintenance 56
Trouble Shooting 63
List of Parts 65
Repeater Switchover Equipment MI-31021-B
Controls
,L
'
Functional Analysis
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LIST OF ILLUSTRATIONS
Figure Title Page
1 CVV-20A (MM-20A) Terminal Standby Station?Open 1?aek 6
2 CVV:20A (MM-20A) Repeater Standby Station?Cabinet Rack 7
3 Terminal Switching Unit, MI-31022-B, Item 1 (front view) 13
4 Terminal Standby Station Warm-up Sequence?Block Diagram 17
5 Terminal Standby Station Radio Equipment Changeover?Block Diagram 19
6 Terminal Standby Station Power Supply Changeover Sequence?Block Diagram 21
7 Terminal Switching Unit, MI-31022-13, Item 1,?Schematic Diagram 23
8 Repeater Switching Unit, MI-31021-B (front view) 27
9 Repeater Standby Station Warm-up Sequence?Block Diagram , 31
10 Repeater Standby Station Radio Equipment Changeover Sequence?Block Diagram 33
11 Repeater Standby Station Power Supply Changeover Sequence?Block Diagram 35
12 Repeater Switching Unit, MI-31021-B?Schematic Diagram 37
13 Standby Lockout Unit, MI-31055?Schematic Diagram 40
14 Receiver/Modulator, MI-31491-B?Schematic Diagram 41
15 Antenna Switching Unit Coaxial Switch?Schematic Diagram 43
16 Terminal Antenna Switching Unit, MI-31022-I3, Item 2,?Schematic Diagram 43
17 Repeater Antenna Switching Unit, MI-31029-B?Schematic Diagram 43
18 Terminal Standby Rack Connecting Cable, M1-31022-B, Item 4 46
19 Terminal Standby Rack Connecting Cable Diagram, M1-31022-B, Item 4 47
19A Terminal Standby Rack Connecting Cable Diagram, MI-31022-C, Item 4 47
20 Terminal Standby Station Interconnecting Cable, MI-31022-13, Item 3 48
21 Terminal Standby Station Interconnecting Cable Diagram, MI-31022-B, Item 3 49
21A Terminal Standby Station Interconnecting Cable Diagram, MI-31022-C, Item 3 49A
22 CW-20A (MM-20A) Terminal Standby Station?Cabling Diagram 51
23 Repeater Standby Rack Connecting Cable, MI-31021-1i, Item 3 53
24 Repeater Standby Rack Connecting Cable Diagram, M1-31021-B, Item 3 54
25 Repeater Standby Rack Interconnecting Cable, MI-31021-13, Item 2 55
26 Repeater Standby Rack Interconnecting Cable Diagram, MI-31021-B, Item 2 57
27 CW-20A (MM-20A) Repeater Standby Station?Cabling Diagram 59
28 Terminal Switching Unit, M1-31022-B, Item 1 (rear view) 61
29 Terminal Antenna Switching Unit, M1-31022-B, Item 2 (rear view) 62
30 Repeater Switching Unit, MI-31021-B (rear view) 63
31 Repeater. Antenna Switching Unit, MI-31029-11 (rear view) 64
32 Terminal Switching Unit, MI-31022-B, Item 1, Connection Diagram 71
32A Terminal Switching Unit, MI-31022-C, item 1, Connection Diagtam 71A
33 Repeater Switching Unit, MI-31021-B?Connection Diagtam 73
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CW-20A (MM-WA) LIST OF EQUIPMENT(t)
5
,.......
. .
Description
MI
Terminal Station
with Terminal
Service Unit and
Standby Switchover
Equipment
MU ROMs,
Station with
Repeater Service
Unit and Standby
Switchover Equipment
Drop Channel
Repeater Station
with Repealer Service
Unit and Standby
Switchover Equipment
TZC
Cabinet
TZR
Rack
R4C
Cabinet
R4R
Rack
D4C
Cabinet
D4R
Rack
Transmitter
MI-31490
2
2
3
3
3
3
'
Receiver/Modulator
MI-31491
2
2
s?
3
3
3
Terminal AFC Unit
MI-31492
2
2
Baseband Amplifier
MI-31493
2
2
1
1
Power Supply
MI-31494
2
2
2
2
2
2
Repeater Service Unit
MI-31495
1
a
1
1
Terminal Service Unit
MI-31496
Duplex Filter
MI-31497-A (")
I
2
2
2
'
2
Cable, Universal
MI-31499-A22
1
I
Cable, Universal
MI-31499-1318
1
1
2
2
2
2
Cable, Baseband
MI-31499-1325
a
Cable, Baseband
U1-31499-1329
1
1
3
3
Cable, Baseband-Term
MI-31499-D18
1
Cable, Baseband-Term
MI-31499-D28
I
1
2
2
Cable, Baseband-Tesm
MI-31499-D10
I
li
Cable, Baseband-Tersro
MI-31499-D54
I
I
Cable, R. F.
MI-31031-16
1
I
Cable, R. F.
MI-31031-20
1
1
,
Cable, R. P.
MI-31031-25
1
a
1
1
a
1
Cable, R. F.
MI-31031-34
2
2
4
4
4
4
Cable, R. F.
MI-31031-37
2 '
2
2
'
2
Cable, R. P.
MI-31031-40
1
I
I
I
Cable, R. F.
MI-31031-50
1
1
2
2
2
2
Chassis with Jones Plug (3W)
711-31009-5
1
1
Blank Chassis (5h")
MI-31010-5
4
4
3
3
3
3
Blank Chassis (7")
MI-31010-7
2
2
2
2
2
2
Termination Panel
MI-31011
Q I
1
1
1
1
1
Handset
MI-31019-A
1
I
1
I
1
1
Repeater Switchover Equipment
M1-31021-B, -C
1
1
1
- 1
Terminal Switchover Equipment
M1-31022-13. -C
1
Filter Mtg, Kit
MI-31024-A
Filter Mtg. Kit
MI-31024-B
I
1
Filter Mtg. Kit
MI-31024-C
1
Filter Mtg. Kit
MI-31024-D
I
1
Rack Channel Frame Type
MI-31025-1184
2
2
2
Trans. Rear Shield
M1-31026-A
2
3
3
Repeater Ant. Switching Unit
MI-31029-B
1
1
1
1
Crystal (specify freq.)
MI-31687-K (")
2
2
Air Filter Kit
MI-31027
2 (*)
2 (*)
3 (`')
3
(")
3
()
3
(*)
Fuse Kit
MI-31082-13
1
a
a
a
a
1
Cabinet
MI-30922-A84
2
2
2
Standby Lockout Unit
M1-31055 (")
2
2
2
2
2
2
(s) TC2/10 or T21t/F indicates addition of two dust filter kits MI-31027.
R4C/P, R411/F, D3C/F or D3R/F indicates addition of three filter kits MI-31027.
(") Suffix number is determined by station hequency assigments.
(s") Required only when ME-31491-A Receiver/Modulators are used.
(t) This table shows the typical radio Equipment rack t equirestsents for the three basic types of microwave sta-
tions and is intended for use only as a guide list. It may also be used as a guide list for the MM-26A sta-
tions by substituting Transmitter MI-31007 or M1-31132-2 for M1-31490 or MI-31132-1, Receiver/Modulator
M1-31102 for MI-31491 and Duplex Filter M1-31113 fur MI-31497..
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WOOPP.ROMMIR,
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Figure 1?CW-20A ( MM-20A) Terminal Standby Station--Open Rack
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Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030003-7
Figure 2?CW-20A (MM-20A) Repeater Standby Station?Cabinet Rack
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CW-20A (MM-20A) STANDBY SWITCHOVER EQUIPMENT
TECHNICAL DATA
TERMINAL SWITCHING
Relay Power
115 vac
250 v de
500 v dc
UNIT MI-31022, -A, -B, -C, ITEM 1
Relay
Symbol Function
'OKI Warm-Up Delay
10K2 Transmitter Fault Enabling/Disabling
10K3 'Power Supply Fault Enabling/Disabling
10K4 Power Supply Switching, Master
1010 Receiver Fault Lock-In
10K6 Radio Equipment Switching, Master
10K7 Receiver Fault Delay
10K8 Power Supply Switching, A.C. Power Transfer
10K9 Power Supply Switching, D.C. Power Transfer
10K10 Radio Equipment Switching, D.C. rower
Transfer
10K11 Radio Equipment Switching, A.C. Power
Transfer
10K12 Radio Equipment Switching, Baseband
Transfer
10113 Power Supply Fault Sensing, A.C. Reg
10K.14 Power Supply Fault Sensing, A.C. Unreg.
10K:15 Power Supply Fault Sensing, D.C.
10K16 Radio Equipment Switching, Standby AFC
Delay
10K 17 Transmitter Fault Re-enabling
Poses
Symbol Panel Marking
10FI SW UNIT AC
10F2 COM 250 V
I0F3 COM ACR
10F4 TERM 250 V
10F5 TERM 500 V
10F6 TERM ACU
10F7 TERM ACR
10F8 STDBY 250 V
I0F9 STDBY 500 V
10F10 STDBY ACU
10F11 STDDY ACR
Rating
IA 32V
0.15A 230V
0.8A 250V
0.4A
0.3A
0.8A
IA
0.4A
0.3A
0.8A
IA
250 V
250 V
32 V
32 V
250 V
250 V
250 V
32 V
All fuses are Bussman type MDM Fusetrons or equivalent.
Quilted'
1OSI?LINE
1052?TEST MYR
10S3?MAN SW TO STDBY-TERM
10S4?MAN SW TO STDBY-PWR SUP
00S5?RESET
Lamps
10111?STANDBY
10I2?TERM
10I3?TEST
10I4?LINE
Weight and Dimensions
Weight-253 lbs.
eigh t-12 % "
Depth-45" Back of Panel-4" Front of Panel
Width-19" Rack Mounting
TERMINAL ANTENNA SWITCHING UNIT MI-31022, -A, -B, -C, ITEM 2
Relay Fewer
115 v ac
Weight
Weight-9 lbs.
Relay Power
115 v ae
250 v de
300 v dc
Dimensions
Height-7"
Depth-10" Overall
Width-19" Rack Mounting
REPEATER SWITCHING UNIT MI-31021, -3, -C
Relays
Symbol
9K1
9K2
9K3
Function
Warm-Up Delay
Transmitter Fault Enabling/Disabling
Power Supply Fault Enabling/Disabling
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TECHNICAL DATA
II 9
Relay
Symbol
9K4
9K5
91(6
91C7
9K8
9K9
9K10
91(11
9K12
9K13
9K14
91(15
91(16
9K17
91(18
91(19
9X20
9K21
9K22
91(23
fuses
Symbol
9P1
9P2
9P3
914
9P3
9F6
REPEATIR SWITCHING UNIT MI-31021, -C
Pune
Function
Power Supply Switching, Master
Receiver Fault Lock-In
E-W Switching, Master
W-E Switching, Master
E-W Receiver Fault
W-:8 Receiver Fault
Power Supply Switching, A.C. Power Transfer
Power Supply Switching, D.C. Power Transfer
E-W Switching, A.C. Power Transfer
E-W Switching, p.c.. Power Transfer
E-W Switching, Baseband Transfer
W-E Switching, A.C. Power Transfer
W-E Switching, D.C. Power Transfer
W-S Switching, Baseband Transfer
Power Supply Fault Sensing, A.C. Reg.
Power Supply Fault Sensing, A.C. Unreg.
Power Supply Fault Sensing, D.C.
Radlio Equipment Switching, Standby AIM
Delay
Receiver Fault Delay
Transmitter Fault Re-enabling
Panel Marking
SW PANEL AC
COM 250 V
COM ACR
E-W 250 V
E-W 300 V
E-W ACU
Relay Poway
115 v an
Weight
Weight?IS lbs.
Rating
IA 32V
0.15A 230V
0.8A 230V
0.3A 250 V
0.3A 250 V
0.8A 230V
Symbol Panel Marking Rating
9P7 E-W ACR 0.8A 250 V
914 W-E 250 V 0.3A 250 V
9F9 W-E 500 V 0.3A 250 V
9F10 W-E ACU 0.8A 250 V
9F11 W-E ACR 0.8A 250 V
9F12 STDBY 250 V 0.3A 250 V
9F13 STDBY 500 V 0.3A 250 V
9F14 STDBY ACU 0.8A 250 V
9F15 STDBY ACR 0.8A 250 V
All fuses are Hussman type MDM Fusetrons or equivalent.
Controls
931?LINE
9S2?TEST PWR
9S3?MAN SWITCH TO STANDBY?E-W
954?MAN SWITCH TO STANDBY?W-E
9S5?MAN SWITCH TO STANDBY?PWR SUP
9S6?RESET
Lamps
911?STANDBY
912?WE
913?E-W
914?TEST
915?LINE
Weight and Dimensions
Weight-31 lbs.
Height-14"
Depth-4W' Back of Panel-4" Front of Panel
Width-19" Rack Mounting
REPEATER ANTENNA SWITCHING UNIT M1-31029, -A, -Et
Dimensions
Height-7"
Depth-10" Overall
Width-19" Rack Mounting
STANDBY LOCKOUT MD-31055
Power Required
Filament 6.3 v an (from receiver/modulator)
B+ 250 v (from receiver/modUlator)
Relay
161(1?Lockout Relay
Tubes
Symbol Type
Function
16V1 RCA 12AX7 Audio Amplifier
I6V2 RCA 12AT7 Audio Amplifier and DC Amplifier
Control
16R4?Noise Gain
STANDBY STATION POWER REQUIREMENT
Terminal Standby Station-585 Watts
Repeater *Standby Station-835 Watts
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DESCRIPTION
GENERAL
The CW-20A (MM-20A) Standby Switchover
Equipment is designed for installation with CW-
20A (MM-20A) microwave relay station equipment
to provide automatic switchover from the main
microwave station equipment to a duplicate set of
standby equipment in the event a fault develops in
the main receiver, transmitter or power supply.
This will assure uninterrupted station operation.
Standby switchover equipment can be installed
in any type of CW-20A (MM-20A) microwave re-
lay station, either the terminal, drop repeater or
thru repeater station. The switchover equipment
can be included as part of the complete equipment
at the initial station installation or it may be in-
stalled at standard CW-20A (MM-20A) stations
already in operation which do not contain standby
switching facilities. To convert a standard CW-
20A (MM-20A) microwave station to a standby
station, the installation of, a separate rack contain-
ing the necessary standby radio equipment and
power supply is required in addition to the switch-
over equipment. The equipment that constitutes
a complete terminal standby station, thru repeater
standby station or drop repeater standby station
is shown in the List of Equipment on page 5.
At a terminal standby station the terminal
switching unit, standby radio equipment, and
standby power supply are installed in a separate
rack located at the left of the main equipment.
The terminal antenna switching unit is located in
the top rack position of the main equipment rack.
At a repeater standby station the repeater switch-
ing unit, antenna switching unit, standby radio
equipment and standby power supply are installed
in a separate rack located at the left of the main
equipment rack.
Terminal Switchover Equipment MI-3102Z-B
provides the standby switchover function at termi-
nal stations. It is composed of a terminal switch-
ing unit which switches in the standby units, and
a terminal antenna switching unit which changes
the antenna connections from the main to the
standby equipment.
Repeater Switchover Equipment M1-31021-B in
conjunction with Repeater Antenna Switching Unit
? M1-31029-B provides standby switchover function
at either drop or thru repeater stations.
Standby Lockout Unit MI-31055 must be in-
stalled in the MI-31491-A receiver/modulator units
at all stations having standby switchover opera-
tion. MI-31491-B receiver/modulator has this
unit as an integral part of its assembly. The
function of this standby lockout circuit is to pre-
vent switchover to standby radio equipment when
the incoming microwave signal fails while the
receiver is functioning normally.
At a terminal station equipped with standby
switching, a main transmitter or receiver fault
switches all of the units of standby equipment into
operation except the standby power supply. The
standby radio equipment is then powered by the
main power supply. A main power supply failure
switches the standby power supply into service to
power the main radio equipment. A main trans-
mitter or receiver failure and a main power supply
failure switches all of the standby units into service
in place of the main equipment at a terminal station
or in place of the E-W or vv-E equipment at a
repeater station.
At a repeater half standby station a main
transmitter or receiver fault (E-W for example)
switches the standby radio equipment into opera-
tion in place of the E-W radio equipment. If the
fault occurs in the W-E (instead of E-W) radio
equipment, the standby radio equipment will be
switched into operation in place of the W-E radio
equipment. In either case, the operating radio
equipment (E-W and standby or W-E and standby)
will continue to receive power from the main
power supply, provided no previous power supply
fault has occurred, with resulting switchover to
operation of the standby power supply.
A main power supply fault switches the standby
power supply into operation to power the radio
equipment operating at the time of the power
supply fault (E-W and W-E, E-W and standby or
W-E and standby).
A standard CW-20A (MM-20A) terminal or
repeater station can be converted to a standby
station by the addition of the proper standby
switching units and standby microwave equipment
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units. The CW-20A (MM-20A) List Of Equip-
ment on page 5 shows the complete list of com-
ponents which comprise each of the three basic
types of standby stations, namely: (1) Terminal
Station with Terminal Service Unit and Standby
Equipment, (2) Thru Repeater Station with Re-
peater Service Unit and Standby Equipment and
(3) Drop Repeater Station with Repeater Service
Unit and Standby Equipment. By the use of this
equipment list, the customer is able to ascertain
what additional components are needed to convert
a standard CW-20A (MM-20A) microwave station
to a standby station, or what components are
required, for a complete installation of each of the
three basic types of standby stations.
In installations using MI-31491-A Receiver/
Modulator, an MI-31055 Standby Lockout Unit
must be installed in both the main and standby
receivers. At terminal standby stations with MI-
31491 -A receiver/modulators, MI-31022-A switch-
over equipment is used. At repeater standby
TERMINAL SWITC110YER
The main and standby radio equipments at a
terminal standby station each consists of the follow-
ing major equipment units: One Transmitter of
series MI-31490, one Receiver/Modulator of series
MI-3149I, one Terminal AFC Unit of series MI-
31492, one Baseband Unit MI-31493 or MI-31120.
The main and standby power supplies each consist
of one Power Supply of series MI-31494. In addition,
the terminal station with standby includes the follow-
ing "common" equipment, which operates at all times
whether main or standby radio equipment or power
supply is in use: one Terminal Switchover Equip-
ment MI-31022-B, -C, one Terminal Service Unit
NII-31496, and one Termination 'Panel., MI-31011
or MI-31056.
The standby radio equipment will be switched
into operation by either a main transmitter or
main receiver fault and the standby power supply
will be switched into operation by a main power
supply fault.
Terminal Switching Unit MI-31022-B, Item I,
(figure 3) performs the function of switching the
standby radio equipment and/or standby power
supply into operation at. a terminal standby station
in the event of a main radio (receiver or trans-
mitter) and/or power supply fault. It contains
the necessary relays and associated components for
switching the input and output connections of etth
main equipment unit (except the "ccimmon"
equipment) to an identical standby tmit.
ii
stations with MI-31491-A, MI-31021 switchover
equipment is used. When MI-31491-B receiver/
modulator is used, tin functions of MI-31055 are
incorporated as an integral part of the receiver-
modulator so that MI-31055 is not required.
M1-31491-A and M1-31491-B differ only in the
inclusion of the lockout circuits. The tubes and
relays for the standby lockout circuit of MI
31491-Bare included in MI-31022-B or MI-
31021 B for both the main arid standby receiver/
modulators. Tubes I2AU7 and 12AT7 serve as
2V17 and 2VI8 respectively and the relay as 2K3.
At terminal standby stations with M1-31491-B
receiver/modulators, MI-31022-B switchover equip-
ment is used At !epeater standby stations with
MI-31491-13 receiver/modulators, MI-31021-B
switchover equipment is used. MI-31022-A is the
same as MI-31022-B and MI-31021 is the same as
MI-31021-B except that MI-31022-B and MI-
31(12-B include the tubes and relays for the lock-
out circuit of MI-1)491-B.
EQUIPMENT M 1-31022-8
The standby radio equipment at a terminal
standby station will be switched into operation
when there is an appreciable decrease in trans-
mitter r-f power output. The switchover is initi-
ated by the transmitter fault sensing device, meter
relay 1M2. This meter, in conjunction with
crystal rectifier 1CRI, gives a relative indication of
output power. When the power fails to the point
where tin black needle of 1M2 comes in contact
with the adjustable red needle, the relay contacts
of 1M2 close and rause relay 7K6 in the terminal
service unit to operate. Relay 7K6 closes contacts
which (I) operate buz.,.er 7113; (2) cause lamp 7111,
the transmitter fault lamp (identified by "T" on
the panel), to light; and (3) initiate immediate
transfer to operation ;If the standby radio frequency
equipment.
After the faulty transmitter has been repaired,
the main radio equipment can be restored to opera-
tion by pressing RESET button, 1055, on the
tertninal switching unit. Normal operation will
then be restored within one minute.
If the IP amplifier in the main receiver/modu-
lator should fal, 4 fault inclicatien is sent to the
terminal switching unit. At this point there is a
delay of six seconds, intended to rii./Tilte,fai
switcliovcr to stanrC-y due to transient Oti COLIF
"Aaiun of this 7.1eIrv, if the indication of rece1.ver
fault still persists, switchover to operntion of stand
-
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by radio equipment takes place, and fault informa-
tion is passed on to the: terminal service unit.
Here the fault information operates relay 7K5,
which in turn causes buzzer 7113 to buzz, and lamp
7112, the receiver fault lamp (identified by "R" on
the panel), to light.
After the fault has been corrected, normal opera-
tion is restored within one minute after the RESET
button is pressed. If the 2C39A tubes in the main
transmitter are old, the transmitter may be slow to
build up power. If this happens, there is a possi-
bility that a transmitter fault will be indicated and
the equipment will switch back to standby after
about 55 seconds. If this occurs, the RESET
button should be immediately pressed again, and
normal operation will result.
When the standby radio equipment is switched
into operation by either a receiver or transmitter
fault the antenna is switched from the main radio
equipment to the standby radio equipment by the
action of the terminal antenna switching unit.
The terminal switching unit contains three relays
which sense faults in the main power supply. If
any of the four output voltages (250 volts, dc,
500 volts dc, ac unregulated, and ac regulated)
of the power supply fail, immediate transfer to
operation of the standby power supply will result.
The terminal switching unit will send power supply
fault information (same as receiver fault informa-
tion) to the terminal service unit causing the buzzer
to sound and lamp "R" to light.
After the main power supply has been repaired,
it can be restored to operation by pressing the
RESET button.
Switchover to operation of standby radio fre-
quency equipment and standby power supply are
completely independent of one another. When
the RESET button is pressed, however, all main
equipment will be restored to operation, regardless
of whether the standby radio frequency equipment,
the standby power supply, or both have been
operating.
CONTROLS
1. LINE switch, 10S1, is the power switch for
the station. The power switches (5S1 and 5S2) in
both main and standby power supplies should be
left closed at all times, and 10S1 used as the
"on-off" switch for the station.
2. TEST PWR switch, 10S2, applies input power
to both main and standby power supplies when
switched to "TEST' with 10S1 closed. This
feature is used in trouble-shooting, as described in
the "Maintenance" section.
3. MAN. SW TO STDBY-PWR. SUP. push-
button 10S4, initiates transfer to operation of
standby power supply. Lamp "R" of the terminal
service unit will light and the buzzer will buzz.
4. MAN. SW TO STDBY.-TERM. pushbutton,
10S3, initiates transfer to operation of standby
radio equipment. Lamp "R" of the terminal
service unit will light and the buzzer will sound.
5. RESET pushbutton, 10S5, will restore to
operation either the main radio equipment or the
main power supply or both when corresponding
standby equipment is operating. If the main
equipment is
due to a fault,
automatically
minute.
incapable of satisfactory operation
the standby equipment will again be
switched into operation within one
FUNCTIONAL ANALYSIS
The following is a detailed description of the
switchover operation at a terminal station with
standby switching as performed by the Terminal
Switchover Equipment, MI-31022-B. Refer to the
block diagrams of figures 4, 5 and 6 and the
schematic diagram of figure 7 as aids in following
this description.
I. Normal Steady-State Condition
This condition is reached by closing the LINE
switch 10S1. Within one minute after this switch
is closed the terminal switching unit in prepared to
perform its switchover functions when a fault
OCCLU S in the main station equipment. The fol-
lowing action ensues when switch. 10S1 is closed.
a. Immediate El lath
Upon closure of the line switch, several different
circuits are energized immediately. AC power is
sent into the main power supply. From there it
comes back to the switching unit, where it operates
power supply fault sensing relays 10K13 and 10K lit.
and lights TERM lamp 1012. This ac power then
goes to the main and common equipment, as ac
regulated and ac unregulated (filament and blower
motor) power. In the main power supply it also
lights lamp 511 and energizes timer 5K3, which has
a nominal delay of 30 seconds. At power is also
sent to the antenna switching unit. It is there
applied to the "normal" (corresponding to main
radio equipment) coil input of the antenna relay.
The antenna relay is a mechanical latch-elec-
trical reset device with micro switches IN hich
move the coil voltage immediately after operation
of the relay. Thus its operating atid rehase colln
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,,,-..nogNmoma101etP$Vato.~.01
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1094
10J 8
10J 9 ? R-)
0S5 -
10 S3
10KI5 I
10K5
(0K14
0
10K I3
1011
IC)12
10S2
1013
1014
101(6
OK 4
10 J1 _10 J 2
10K 16
10 J3
10K 3
10F 1
T ? 10J4
I ?
SIRtie Tf
m?Pi Sw
?%
1,r1u PsyRSVPIT
$T PWR
1066
10C 7
10C111?T
I0G5
1064 10C3
13
;OA 0
IOC!
10F4
7-
10F8 10F9
10F5
10F10 10F11
10F6
Figure 3?Terminal Switching Unit, MI-31022-B, Item 1 (front view)
are of the momentary duty type. The relay will
remain in either normal or standby position until
ac power is applied to the coil which will transfer
it to the opposite position. (See figure 15.)
If the LINE switch 10S1 is opened when the
switchover equipment is in standby condition, all
the relays of the terminal switching unit will reset
when power is removed, so that when it is re-
applied, the main equipment will be activated.
The antenna relay, however, will remain in standby
condition until the LINE switch is closed again
and power is applied to its "normal" coil.
When the LINE switch 10S1 is closed, ac power
is also applied to the LINE lamp 1014, indicating
the "Power On" condition. Power is also applied
to motor-driven timer 10K1. The purpose of this
delay (0.9 minute) is to allow the main power
supply and main transmitter to warm up before
the associated fault circuits are enabled.
I0F2
10J5
10K 2
10J 6
10F 3
10F7
10J 7
74747
b. 30 seconds after LINE switch 1051
is closed
Timer 5K3 in the main power supply operates
and supplies input ac to the high-voltage transformers
of the 250 volt and 500 volt rectifiers. The dc out-
put of these rectifiers is fed into the terminal switch-
ing unit, and from there to the main and common
equipment.
It will be noted from the schematic of figure 7
that each power connection to the main, standby,
and common equipment from the switching unit is
fused in the switching unit. Thus, if a short-
circuit develops in the main transmitter, for ex-
ample, a fuse will blow in the switching unit. The
main equipment, with one of its input voltages
removed, will indicate a fault and switchover to
operation of standby radio frequency equipment
will occur. If these switching unit fuses were not
provided, a transmitter short-circuit would blow a
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P.2?44 -CY 4 li.r.,14?."4"."W
41.4. ? .... 4
? 4,10
14
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fuse in the main power supply, which would result
in operation of the standby power supply and
subsequent blowing of its corresponding fuse.
C. 0.9 minutes after LINE switch 10S1
Is closed
Timer 10K1 completes its cycle and operates its
contacts (3, 4 and 5) which in turn energize 10K2
and ll0K3. 10K2 and I0K3 operate, performing
the following functions:
10K2 Operation
Normally open contact 3-4 is not connected..
Normally open contact 7-8 enables the
transmitter fault circuit.
Normally open contact 5-6 is not connected.
Normally closed contact 9-10 releases 10K1,
which re-cycles in approximately one second.
Transfer contact 11-12-13 locks in 10K2
through the normally closed portion of
transfer contact 11-12-13 of 10K4.
(1)
(2)
(3)
(4)
(5)
10K3 Operation
(1) Transfer contact 3-4-5 is not connected.
(2) Transfer contact 6-7-8 locks in 10K3 and
enables the power supply fault circuit.
The switchover equipment has now reached its
normal steady?state condition.
2. Switchover to Operation of
Standby Radio Equipment
The actual switchover is accomplished by relays
10K6, 10K10, 10K11 and 10K12, and the antenna
relay, regardless of the type of fault initiating the
switchover. The last four of these relays are
operated by contacts of 10K6; therefore, the fault
sensing circuits must operate 10K6. The manner
in which this is accomplished will be dealt with
first, followed by a description of what 10K6 and
its satellite relays do. In each case, normal steady-
state initial conditions as described in the preceding
paragraph under "0.9 minutes after LINE switch
1081 is closed" are assumed.
a. Transmitter Fault
When the black needle of the if monitor 1M2 in
the main transmitter falls and contacts the red
needle, a ground circuit is connected which operates
transmitter fault relay 7K6 in the terminal service
unit, if TERMINAL FAULTS switch 7S5 is closed
(in its upper position).
NOTE: This switch should normally be kept
dosed, otherwise it will prevent the sensing of
transmitter faults and the subsequent transfer
to standby operation.
The ground circuit goes through contacts 10K5-
11-12-13 (which disables the transmitter fault
circuit in the event of a receiver fault) and 10K2-
7-8 (which disables the transmitter fault circuit
during transmitter warmup and power supply
switchover). These contacts are both closed how-
ever, since under normal steady-state conditions,
10K2 is operated (its normally open contact 7-8 is
closed) and 10K5 is not operated (the normally
closed part of its transfer contact 11-12-13 is
closed).
When 7K6 operates, the contact designated "A"
on the terminal service unit schematic, lights the
"T" lamp on the service unit indicator panel. Its
"B" contact operates relay 71(3 which operates the
buzzer and locks itself in. The "C" contact of 7106
feeds ac into the switching unit to operate 101(6.
and thus initiates switchover.
b. Receiver Fault
In the event of a fault in the main receiver/
modulator 30 megacycle IF amplifier, relay 2K1 in
the receiver/modulator operates, and relay 161C1 in
the standby lockout unit (or relay 2K3, if the
receiver/modulator is MI-31491-B) does not. The
transfer contact 2K1-2-3-4 disables the main
transmitter AFC motor, and operates baseband
squelch relay 2K2 which, through contact 2-3-4,
cuts off the baseband and service channel outputs
of the receiver/modulator, by breaking the 13+
circuit to 2V15. Transfer contact 5-6-7 of 2K2
sends ac through the normally closed part of the
transfer contact 2-3-4 of 161(1 (or 21(3). This ac
is then fed to the switching unit, where it energizes
motor-driven timer 101(7. This timer introduces
a delay of 6 seconds to prevent undesired switch-
over due to transients. When it operates, its
transfer contact 3-4-5 operates relay 101(5, which
locks itself in with normally open contact 3-4.
Normally open contact 7-8 of 101(5 feeds ac into
the terminal service unit where it operates relay
71(5, if TERMINAL FAULTS switch 7S5 is
closed. The "A" contact of 71(5 lights the "R"
lamp of the service unit indicator panel, while the
"B" contact operates 7K3, which operates the
buzzer and locks itself in thru its "B" contact.
The "C" contact of 7K5 is not connected.
The normally closed contact 9-10 of 101(5 re-
leases.10K7, which recycles in less than one second.
The nominally closed part of the transfer contact
10K5-11-12-13 disables the ranstnitIer fault
circuit, And time normally open contact 101(5-5-6
operates 10K6, initmating swilehever from main to
standby 2adio equipment.
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c. Manual Switchover to Standby
If the MANUAL SWITCH TO STANDBY
TERMINAL button 10S3 is pressed, it operates
relay 10K5. The sequence of action that occurs
after 10K5 is energized is the same as described in
2b of page 14, resulting in switchover from main
to standby radio equipment.
d. Switchover?Functions of 10K6
and Satellites
When 10K6 operates, transfer contacts 3-4-5
disables the main transmitter AFC motor by re-
moving the "Relay Common" ac from the main
receiver/modulator, and enables thermal timer
10K16 to apply "Relay Common" ac to the stand-
by receiver/modulator after a 30 second delay.
This delay prevents the standby transmitter AFC
motor from running at random before the standby
equipment is properly warmed up.
Transfer contact 10K6-6-7-8 operates the an-
tenna switching relay to its standby position.
Normally open contact 10K6-9-10 and normally
closed contact 101(6-11-12 together act as a trans-
fer contact which switches the terminal service
- unit received service channel from main to standby
receiver/modulator. Transfer contact 10K6-13-
14-15 performs a similar function with the trans-
mitted service channel. Normally open contact
101(6-16-17 operates satellite relays 10K10, 10K1 I ,
and 10K12, while normally open contact 101(6-
18-19 locks in 10K6.
The function of 10K10 is to transfer the 250
volt dc and 500 volt dc power from the main to the
standby radio equipment. Since the transfer of
such dc voltages at the currents used has a tendency
to establish sustained arcs at the contacts, a power-
type relay with double-break transfer contacts and
resistance-capacitance arc-suppression networks
is employed. Transfer contact 10K10-5-6-7-8
switches the 250 volt load, while 10K10-1-2-3-4
switches the 500 volt load.
Relay 101(11 transfers the ac regulated and ac
unregulated outputs of the power supply from the
main to the standby radio equipment. A power-
type relay is used. Transfer contact 4-1-3
switches the ac unregulated, while contact 5-8-6
switches the ac regulated. The latter also applies
power to STANDBY lamp 1011 and to the heating
element of thermal timer 10K16, which delays the
activation of the standby transmitter AFC motor
as described above.
Relay 10K12 transfers the baseband input and
output of the radio equipment. Since these are
balanced circuits, two transfer contacts are re-
t5
quired for baseband transmittcd, and two for
baseband received. 10K12 contacts 3-4-5 and
6-7-8 transfer the transmitted baseband, and
contacts 9-10-11 and 12-13-14 switch the received
baseband.
3. Switchover to Operation of
Standby Power Supply
For switchover from main to standby power '
supply, normal steady-state condition of the termi-
nal ssiritching unit is assumed.
a. Fault Sensing
Relays 10K13, 10K14 and 10K15 are the main.
power supply fault sensing relays. 10K13 is a 115
volt ac relay with its coil connected directly across
the ac regulated output of the main power supply.
It remains in the energized position under normal
conditions. If the ac regulated output of the
main power supply fails, 10KI3 releases, operating
transfer contacts 3-4-5 and 6-7-8. Contact 6-7-8
is not connected, but contact 3-4-5 operates I0K4
the master power supply switching relay, and
' energizes 10K17, the transmitter fault re-enabling
relay. It is this operating circuit of 10K4 and
10K7 that is kept open during the initial warm-up
by the power supply fault disabling contact
10K3-6-7-8.
Relay 10K14 performs exactly the same function
as 10K13, except that its coil is connected across
the ac unregulated output of the main power
supply. Thus it monitors the blower motor power.
Relay 10K15 is a double-wound dc relay which
monitors both the dc ? outputs of the plain power
supply. Each dc voltage is connected to one of the
coils of this relay, through a resistor. The mag-
netic flux due to the't wo windings cancels when the
two dc voltages maintain the proper ratio, and the
relay does not operate. Howeve:, if one of thr:
voltages should fall, so that the: ratio gets outside
specified limits, 10K15 will operate and close con-
tacts 5-6, which operate relay 10K4 and energize
10K17.
b. Manual Switchover to Standby
MANUAL SWITCH TO STANDBY-POWER
SUPPLY button 10S4 is connected in parallel with
the contacts or 101(13, 101(14 and 10K 15. Wile-
it is pressed, tl3K4 is opera' ed, 10KI 7 Is energized,
and a transfer to ?petal ion of standby power supply
is initiated.
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c. Switchover--Functions of 10K4
and Satellites
(fl 10K4 Operation
Transfer contact 10K4- I 1-12-13 operates satel-
lite relays 10K8 and 10K9,, the operation of which
is described under "10K8 and 101(9 operation"
and releases relay 10K2 in order to disable the
transmitter fault circuit while power supply
switching takes place and the standby power
supply warms up. The action of relay 10K2 will
be described under "Transmitter Fault Disabling."
Normally closed contact 10K4-9-10 assures that
relay 101(2 will not be re-operated until timer 10K1
has completed its delay cycle.
Normally open contact 101C4-3-4 sends fault in-
formation to the terminal service unit, where it
operates 7K5. The contacts of 7K5 light the R
lamp on the indicator panel and operate 7K3 which
operates the buzzer 7113. Normally open contacts
10K4-5-6 and 10K4-7-8 are not connected.
(2) 10K8 and 10K9 Operation
101(8 is a power-type relay which transfers the
ac line from the input of the main power supply to
the input of the standby power supply, and also
transfers the a?egulated and ac unregulated loads
from main to standby power supply. Contact
2-13-1 switches the input ac high, contact 4-12-3
switches the input ac common, contact 8-10-7
switches the ac regulated load, and contact 6-11-5
switches the ac unregulated load.
10K9 is a double-break relay similar to 10K109
which was described undei "Switchover to Opera-
tion of Standby Radio Equipinent?runctions of
10K6 and Satellites." It also has similar arc-sup-
pression networks. Its inaction is to transfer the
250 volt dc and 500 volt de loads from the main
power supply to the standby power supply. Com-
tact 1-2-3-4 switches the 500 volt load, while
contact 5-6-7-,8 switches the 250 volt. load.
(3) Transmitter Fault Disabling
During the period of power supply switchover
and of standby power supply warmup, it is neces-
sary to disable the main transmitter fault circuit.
With no dc voltage input to the transmitter, the
fault contacts of IM2 will be closed. With no dc
voltage, the transmitter fault relay 7K6 in the
terminal service unit cannot operate. However,
when the dc voltages are applied, if no disabling
were used, 7K6 would operate before IM2 breaks
its fault contacts, and a svritchover to operation of
standby radio equipment would take place. There-
fore, the transmitter fault circuit must be disabledl
until the standby power supply is sufficiently
warmed up and is delivering full power.
To accomplish this, advantage is taken of the
10K1-10K2 disabling cycle used when the equip-
ment is originally energized (see section entitled
"Normal Steady-State Condition"). As men-
tioned under "10K4 Operation," contact 10K4-11-
12-13 releases 10K2. Normally open contact
10K2-7-8 disables the transmitter fault circuit,
while contacts 10K2-5-6 and 10K2-3-4 are not
connected. Normally closed contact 10K2-9-10
energizes tinier 10K1, and transfer contact 10K2-
11-12-13, in conjunction with the now open contact
10K4-9-10, assures that relay 10K2 cannot be re-
operated until tinier 10K1 completes its delay cycle.
Since the coil circuit of 10K2 has been broken by
contact 9K4-11-12-13, an alternate circuit is pro-
vided after a delay of 5 seconds by contact 5-7 of
10K17.
Relay 10K17 is a thermal timer with a 5 second
delay, the function of which is to provide the
circuit for the re-operation of 10K2 (and hence, the
re-enabling of the transmitter fault circuit) after
10K1 completes its cycle.
After a delay of 0.9 minutes, 10K1 operates, and
its contact 3-4-5 operates 10K2 through 10K17-5-7.
10K2 contact 3-4 closes again, but this is of no
consequence, since contact 10K4-5-6, in parallel
with 10K2-3-4, is already closed. 10K2-7-8 again
enables the transmitter fault circuit, since by this
time the standby power supply has assumed the
load. Contacts 10K2-3-4 and 101(2-5-6 are not
connected, 10K2-9-10 releases 10K1, and 10K2-11-
12-13 locks in 10K2 through 10K17-5-7.
4. Antenna Switching
Terminal Antenna Switching Unit (Item 2 of
MI-31022-B) is a rack mounting unit inStalled in
the top-most location in the main equipment rack.
It contains a relay with two coaxial contacts, which
is operated when switchover takes place. The
coaxial contacts switch the transmitter and re-
ceiver antenna connections. The relay is of the
type which removes the energizing voltage im-
mediately after it is operated. When operated, it
is mechanically latched and remains operated until
its "release" coil is energized.
This relay is controlled by the action of the
master radio equipment switching relay 10K6.
When a transmitter or receiver fault operates
10K6, contact 6-7-8 applies ac to the antenna
switching relay "standby"' (operated) coil. This
switches the antenna to the standby equipment.
With the fault repaired and RESET button 10S5,
pressed, 10K6 is released and its contact 6-7-8
applies ac to the "normal" (release) relay coil
changing the antenna from the standby radio
equipment to the main radio equipment.
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ANTENNA SWITCHING UPAT
MX- stozz A/e/c ITEM 2
11J1 2
10.17 -2
AC COM.
AC NISH
SWITCH
1051
4
1 2
1?v?'
TERMINAL SWITCHING UNIT
MI-51022 A./6/c rrem 1
- 1 4 4 AC LINE
MAIN POWER SUPPLY
MI-3I44
5J5 -14 5
ANTENNA
RELAY
*NORMAL'
TO MAIN
TRANSMITTER
BLOWER MOTOR -4
TO FILAMENT
TRANSFORm ERS IN
MAIN EQUIPMENT
TO FILAMENT
T P.ANSFORmER
IN TERMINAL
SERYTCE UNIT
10K 1
ENERGIZED
10J7 -745
%Ale LAMP
1.02 4
LIT
10J41-4 5
5J4 -? 4 5 AC uNREG.
511
AU TO-
T RANSFORMER
10.17-9 45
10 J7 - 12 4 it
TO TERMINAL
SERVICE. uNiy
ZSO
10.1 7 - 10
TO MAIN 10.17- S
TRANsMITT ER .16
500
TO MAIN EQUIPMENT
LSO V
4
30
10.17 - 4
TImE DELAY
0.1, MIN
*TULA LAMP
1.012
LIT
MON TOR
RELAY
101(14
OPERATED
MOIJITOR
-- RELAY 101415
NOT OPERATED
10J6 -4 *3
MONITOR
Rt LAy
WOE
OPERATED
10541
05,2RATED
I.
POWER SUPPLY
FAULT CIRCUIT
EliASLIED. 101(3
LOCKED IN
-
10042 LoGNETI
IN 7HRour..14
10k411 - 12
5J4 -6 t 5 AC REG.
/ 17-18
SK5
EWER% I ZED
5643
OPERATED
1
5.14-2
+110ov
DC
500 V
250 v
SUPPLY
SUPPLY
5./4-1
4SSOV
OC
TIME DELAY
>0.5 MIN.
Nf...'T2S;
1-AIL RELAY CoNTACTS SHOWN IN OPERATED CONDITION.
PARTIAL eLOCX DIAGRAM
(ciwzaik TotheINAL 3TANIDEIY STATION)
( Immoaur sequaica)
C-743679 -2
Figure 4?Terminal Standby Station Wane-up Sequence?Block Diagram
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030003-7
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030003-7
STAIN TRANSMIT TER
Lc-51490/51490 A
Ion
I.JA 2
? 7 LAMP
IT
7J4-2
1 71(6 i
OPERATED
B
CF MONITOR
71(5
OPERATED
BUZZER
OPERATED
7K5 LOCKED
IN
TERMINAL DERviCE UNIT
MI-51496
7,13-4
MAIN RECEIVER/1400UL ATOR 2
MI-31491-A
TRArART
ImAtAIFC MOTORM1
DISABLED
C
4F
RECEIVED
BASE BAN ID
DISABLED
4
OPERATED]
2K2
II
TERMINAL SWITCHING UNIT
MI-31082 A/B - ITEM 1
10J4-9
STANDBY LOCKOUT UNIT
- 5105 5 :5F NOT F. '3)
_ .
161(1 NOT]
OPE RAT ED
2Ji5 -4
10J3 10
rSvimNuAL
ITCH TO
STANDBY
1053[
30
TTIME DELAY
0.1 MIN. kNERG,IZED
1010
1015 7
[OPERATED
IORnI
10K5
OPERATED
101(5
LOCKED IN
71(5
OPERATED
IR LAMP 71(3
LIT OPERATED
BuZ ZER
OPERATED
-IIL
LOCKED IN
7J6-4
10J6- 14
OR
JOKE.
OPERATED
RELAY COMMON.
AC REMOVED
FROm MAIN
RECEIVER
1
10K16-5-7MADED
TO NPPLY'RELAY
COM'AC TO STAND.
BY PEE/MOD.
6
10J 7 - 2
ANTENNA RELAY
SWITCHED TO
STANDBY
ANTENNA SwITCHING UNIT
MI -3I022-4/B ITEM a
10J 7- 1
12 14
10 TIT
TERMINAL SVC UNIT
CEIV1D ENANNEL
TRANSFERRED FRONT
MAIN REc/MOD TO
STANDBY REC./MOD.
15
15
/ 19 20
NO T S
1-ALL REL AY CONTACTS AND SWITCHES SHOwN ;N STANDBY- ACTIVATING CONDITIOnt,
THOSE IN LEFT KANO (.17/1.6) PON TioN ARE '...HowN RELEASED. WHILE THOSE. IN I
RIGHT NAND(') POSITION ARE SHOWN OPERATED.
2- RECEIvER/MOIDULATrA FAULT I', THDICATED WHEN 21(2 IS OPERATED AND 8
1E1(1 IS NOT OPERATED.
3-WITH MI - 31451 IS REEEIvER/MOVLA AIC.k. No STANDBY LOCKOUT UNIT 5 a
usED AND THE. FUNCTION OF 161(1 IS PER F ORMED BY PICA IN THE
RE C [NEE( /ATODuL AT OR .
CD
Cs1
01
"Cr
01
0-
1=1
sCi
01
Cs1
CO
Cs1
15
RMINAL SVC UNIT
TRANSMITTED SVC CRAB.
TRANSFERRED FROM
MAIN REC/MOD. 10
STANDBY RECAT00-
D-629 555
16 1.51y
r-1 h'I
UI? ,?)19
[10K6-1
LOCKED IN
10K 12
0.ERMED
5 5
TRANSMITTED BASE
TRANSFERRED RCM NAM
BAND UNIT TO
TANDBY BASEBAKO IN
10
?
15
?
2. 14
RECEIVED BASEBAND
7RAKSFERIED MORI MAIN
BASEBAND UNIT TO
STANDBY BASEbiND UNIT
101111
OPERATED
4 f. 50
MAIN POWER SUPPLY
.RC uNREWTRANSFERRED
FRom MAIN EQUIPMENT TD
STANDBY EQUIPMENT
4TERIA" LAMP
1012
IN-ENERGZED
INN POWER SUPPLY
'AC REG" TRWISFERRED
FROM MAIN EQUIPMENT
D STANDBY EQuIPMENT
101516
ENERGIZED
-STANDBY'
LAMP
10E1 LIT
TIME DELAY
101(1E;
50 SEE.
I. OPERATED
"RELAY CONAMCA
AC APPLIED To
%%MT REC./1.4
2
4
10K 10 I
OPERATED
IMAIN POWER WETLY '
MAIN POWER SUPPLY
50o DC TRANSFERRED I IZSDY DC TRANSFERRED500'.
,FROPA mA114 DAAPWIENT It Rom WIN EQoPmENT
lTC STANDEN EQUIPmENT 70 STANDBY EQUIPMENT
Figure 5?Terminal Standby Station Radio Equipment Changeover?Block Diagram
11
TERMINAL SWITCHING UNI T
' I ID
+ 500 V. DC
?,t et-
sL)
?
Cr,
-4
10K1S
.2'EE NOTE"E)
AG
RF
,
L.0
101
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Figure 33-Repeater Switching Unit. MI-31021-11--Connection Diagram
Approved For Release 2000/08/29 : CIA-RDP79T01049A002600030003-7