PRELIMINARY INSTRUCTION MANUAL FOR RADIO SET AS-3

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A002000050002-1
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 31
• Document Creation Date: December 27, 2016
• Document Release Date: April 2, 2013
• Sequence Number: 2
• Publication Date: February 11, 1959
• Content Type: REPORT

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PRELIMINARY
INSTRUCTION MANUAL
FOR
RADIO SET AS -3
This document is part of an integrated
file. 11 separated from the fde it must be
subiecled to individual systematio review..
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PRELIMINARY
INSTRUCTION MANUAL
FOR
RADIO SET AS-3
2/11/59 Copy j- of 7
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CONTENTS
raI
Pa,e
1-1.
1-2.
1-3.
SECTIOr I - GENERAL INFORMATION
Scope
Purpose
Description
1
1
1
SECTION II - PREPARATION FOR USE
2-1.
General
3
2-2.
Power Supply Selection
3
2-3.
Interconnection.of
3
2-4.
Transmitter Tuning
4
2-5.
Preparation of Cartridge
6
SECTION III - OPERATION
3-1.
General
10
3-2.
Receive Mode
10
3-3.
Transmit Mode
10
SECTION IV - MAINTENANCE
4-1.
Oene,:al
15
4-2.
Battery Maintenance
15
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ILLUSTRATIONS
Figure Title
Radio Set AS-3, Less Receiver and Printer Frontispiece
Page
2-1. Interconnection of AS-3 Units Using AC-3 Power Supply 7
Interconnection of AS-3 Units Using BA-3 Battery 8
2-3. CA-3 Cartridge with C0-3 Coder 9
3-1. AT-3 Transmitter, Operating Controls 12
3-2. AC-3 Power Supply, Operatinu, Controls 13
3-3. CA-3 Cartridge with AT-3 Trans;Atter
BC-3 Battery Charler, Operating Controls 13
AT-3 Transmitter, Schematic Diagram 19
AC-3 Power Supply, Schematic Diagram 20
BC-3 Battery Charger, Schematic Diagram 21
BA-3 Battery, Schematic Diagram 22
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BA-3 BATTERY
Figure 1-1. Radio Set AS-3, Less Receiver and Printer
(Sheet 1 of 4)
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BC-3 BATTERY CHARGER
Figure 1-1. Radio Set AS-3, Less Receiver and Printer
(Sheet 2 of 4)
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CA 3 CARTRIDGE
Figure 1-1. Radio Set AS-3, Less Receiver and Printer
(Sheet 3 of 4)
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AC-3 POWER SUPPLY
Fite 1-1. R1ir Set AS-, Les. and Printer
(Sheet 4 of 4)
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.11?010.
SECTION I
GENERAL INFORMATION
1-1. SCOPE.
This manual contains operating and maintenance instructions for the
AT-3 Transmitter, AC-3 Power Supply, BA-3 Battery, BC-3 Battery
Charter, CO-3 Coder, end CA-3 Cartridge (Figure 1-1). These
units when combined with a receiver (RR/D-11 or equivalent)
and a printer (TP-3 or equivalent), not covered herein, com-
prise Radio Set AS-3.
1-2. PURPOSE.
Radio Set AS-3 is a miniature, automatic radio set for c7w
transmission and reception of radio messages. Transmission may
be manual using a telegraph key, or it may be automatic using
a tape cartrid;e for transrission at the rate of 300 words
per minute.
1-:. DESCRIPTION.
AT-3 Tranqmitter. The AT-3 Transmitter is housed in a black-
anodized aluminum case. All operating controls, except the built-
in telegraph key, are accessible through cutouts in the cover the
built-in key is c.ttached to a hinged pinel on the front surface.
A bracket assembly is provided for mounting the CA-3 Cartridge
for transmission of taped messages. Keyed connectors on the back
and each side of the transmitter provide for connection to a
power supply, a receiver, and a printer.
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The transmitter operates in the frequency range of 3 to 30
megacycles and is crystal-controlled.
AC-3 Power Supply. The AC-3 Power Supply is housed in a black-
anodized aluminum case. This unit furnishes power to the AT-3
Transmitter (and the assoCiated receiver and printer) from a
70- to 270-volt, 50- to 400-cycle, a-c power source. A line-
selector switch and meter are flush with the top surface. A
hinged panel in the cover provides access to a compartment
containing the line cord. The AC-3 Power Supply can also be
used to charge the BA-3 Battery.
BC-3 Battery Char.g.er. The BC-3 Battery Charger is used to charge
the BA-3 Battery from a 70- to 27C-volt, 50- to 400-cycle, a-c
power source. The unit is housed in a black-anodized aluminum
case. A line-selector switch and meter are flush with the
top surface. A connector at one end mates with the BA-3 Battery
and a hinged panel at the other end provides access to a com-
partment containing the line cord and a circuit breaker.
CA-3 Cartridge. The CA-3 Cartridge is used to store infomation
for automatic transmission.
CO-3 Coder. The C0-3 Coder is used to place information on the
tape in the CA-3 Cartridge by means of three keys located on the
front of the coder.
2
3
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c rd to the power source. ? Rotate the line-selector switch
clockwise until the pointer of the AC-3 meter is in the green
gment at the center of the scale.
Note
If the line-selector switch is set below the line
voltage, the protective circuit breaker within the
AC-3 will open and the red button will pop up.
Select the next higher position of the switch
(counterclockwise rotation) and push the red
button down to reset the circuit breaker.
U4e of BA-3 Battery. With AT-3 function switch in REC. + STAYDBY
J. TRANSMIT position, depress BATTERY button (white button) on the
AT-3 Transmitter. If the pointer of the adjacent meter is in
tg een segment of "B" scale, the battery is useable. If meter
1 i dication is in red segment of "B" scale, charge the battery
al described in
Section
IV.
I
24. TRANSMITTER TUNING.
S lect a suitable CR-18/U Crystal in the 3- to 10-mc range for the
dJsired transmitting frequency and insert it in the crystal socket
on
the front of the AT-3. (The crystal frequency is doubled or
tnipled as required.) Tune the transmitter as follows:
Step 1. Set oscillator coil wiper wheel to approximate
frequency by rotating thumbwheel
I to position wiper wheel
urlder the scale above the coil.
Step 2. Set function switch to TRANSMIT position.
Step 3. Open KEY door and depress the key.
Note
Do not hold key down for long periods with
power-amplifier tank out of resonance. De-
press key only while actually tuning.
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Step 4. Adjust oscillator by rotating thumbwheell'for
maxi.mim meter indication on 'A" scale of meter adjacent to
oscillator coil.
Step 5. Rotate antenna switch fully clockwise
(position 11).
Step 6. Rotate meter-adjust control fully from left to
right. If TUNE TO MAX meter deflects to right-hand stop, back
off on the meter-adjust control until TUNE TO MAX meter reads
about three-fourths of full deflection.
Step 7. Rotate thumbwheel (12) until a dip is indicated
on the meter adjacent to the oscillator coil. If TUNE TO MAX
meter deflects full scale during this step, rotate meter-adjust
control to the left until TUNE TO MAX meter reads about one-third
of uil deflection.
Step S. Rotate antenna switch 0-) one position counter-
clockwise and adjust with thumbwheel c2 For maximum indication
on TUNE TO MAX meter.
Step 9. Repeat Step 8 until position of antenna switch
is determined for which deflection of the TUNE TO MAX meter is
Maximum.
Step 10. Check results of Step 9 by tuning with thumhwheel
for antenna switch positions. adjacent to the one thouht to be best.
Step 11. Set antenna switch 0 to position selected
and adjust thumbwheel (-2:' for maximum deflection of TUNE TO MAX
meter.
Step 12. Touch up adjustment with thumbwheel for
maxiiaum def1,2etion of TUNE TO MAX meter.
The transmitter is now tuned for maximum output power and is ready
to operate.
5
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2-5. PREPARATION OF CARTRIDGE.
The CO-3 Coder is used to prepae the CA-3 CartrLdge for trans-
mission (refer to paragraph 3-3 for procedure for erasing a
previous message from the tape in the CA-3 Cartridge). Insert
the cartridge into the coder as follows:
Step 1. Lift the hinged panel in the top surface of the
coder.
Step 2. Fold back the cover of the cartridge and engage
the lip at the lower left corner of the cartridge with the
cartridge-holJing bracket of the coder.
Step 3. Press down on the right side of the cartridge
until the spring catch engages the coder bracket (see Figure 2-3).
Use the coder keys to insc:ibe the message on the cartridge tape
in standard dots and dashes. Depress the SPACE key once between
characters and twice between words for proper spacin7,.
To remove the cartridge from the coder, depress the spring catch
at the lower right corner of the cartridge and lift the cartridge
out. The tape will rewind autorlatieJlly and hiLl be ready for
transmission upon insertion in the transmitter.
6
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17:IS PTIOTORAPH
TO FOLLOW
Figure 2-J. CA-3 Cartridje wit CO-3 Coder
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SECTION III
OPERATIOr
3-1. ilENERAL.
Figures 3-1 and 3-2 identify the operating controls of the AT-3
'Zrans icte-c and the AC-3 Power Suppi:. The function sl.itch of
the transmitter must be set fer the isire_d mode of operation:
REC. ONLY, REC. + STANDF,Y, or TRANSM:T.
3-2. RECEIVE MOLE.
To receive messages on the receivcr as ;.cited with tie AT-3
Transmitter, set the function suitch on the tram,i,iit.21- to
REC. ONLY or REC. + STANDBY. The REC. + STANDBY position applies
power to ic transmitter filament; and is used if the opec%.tor
expcct to ')e transmittiug mesges ';iCtin the next F.ew nites
TRANSM7T MODE.
Trau!;mi,sion may be of Circe iype. rInual, automatic tzans-
mission of identification si:nol, or automatic transmic.sion of
inforation in toe CA-3 Cartridgo. For eact,,Te of trans-
the transmitter mw;t. fir '.-t be tuned as specifi-d in Section
IT. If BA-3 Battery is used, Cleck as ,Tecified in par-graph
2-2 before tralisilcting.
M-noal Transmission: Set clie 2.irction switell of th transr
to TRANSMIT. Open the KEY door uu1 use to built-in key to send
the desired message.
Note
An eternal key can be connected te thc!
EXT. KEY connectors and used instead ci the
built-in key.
10
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Autoratic Identification. Set tie fenction switch to TRANSMIT,
Push the yellow button maeked IDY and hold it down for a few
seconds at a time.
katoratic Messav Transeission. Insert t e CA-3 Cartridge into
the cartridge holder of te'e trerenlitter as follows:
Step I. Lift the hinged panel above the faction s%A.tch.
Step 2. Fold back the cover of the cartridge and engaee the
lip on the lower left corner u cre ea :triage.
Step 3. Pres down on the Tie side of t' -t-ll-e
until the spria.j catch en es (see Fieure
To transf,it the prepared rLessa,],e, set the function switch to
TRANSMiT and press down ca the Iiide tutton marked MSC. E 11
the button down until the transmission has been completed.
Note
The MSG button should ne released when
the transmitter stops transmitting or
when the cartridge wheels stop turnity.
Remove the cartridge by depres:3ing the spring catch at the lower
right corner and lifting the cartridge out. The cape will re-
wind automatically and will be ready to transmit again upon re-
in3ertion in the transmitte:.
To erase the ressaGe on the cartrid.ge tape, insert the cartriT c
in the same manner as for transmission. Depress plur6er shaft
below ERASE arrow on the cartridge hol,:er. Push the pluner
shaft down until the drive motor starts and hold it down until
the cartridge wheels stop turnin. Upon removal from the trans-
mitter, the cartridge is ready for insertion in the CO-3 Coder.
(Refer to paragraph 2-5 for preparation of the caiLeidge.)
11
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THIS PHOTOGRAPH
TO FOLLOW
Figure 3-1. AT-3 Transmitter, Operating Controls
1 2
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Line Cord Compartment
Power Meter
Circuit Breaker
Reset Button
Line-selector
Switch
Figure 3-2. AC-3 Power Supply, Operating Controls
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Spring Catch
Figure 3-3. CA-3 Cartridge with AT-3 Transmitter
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/
GENERAL.
SECTION IV
MAINTENANCE
Scb('7:atic: I., ras of the AT-3 Transmitter, the AC-3 Power Sepply,
the BC-3 Battery Charger, and the BA-3 Battery are sho;..n in
Figures 4-2 throuh 4-5. The CO-3 Coder and the CA-3 Cartrilo.
are mecianical devices. In case of fiLlty operation of tha trans-
mitter, pc:./er sdpply, or baLtory ch remove rhe ')ottom plate
cover of the unit awl inspect for loose connection!-:
evflence ot: o? rheatinp. If vis.udi inspOcriaa does not. dis-
close the L:ouble, disconnect all Llides and tranrisroc .in
th.2 unit, and make coth:inuity and resist:duce Clecks. If a 'cr
tor or diode is cuspected of being j(-7...xtize, suLstiLuLe a new
one _nh :echeck he performance of the unit.
When soldertn o: unsol,ierin a diode or
trancistor lead, grip che lead with
pliers between Le s0l]ec joint an Lae
diode or transistor. The pliers form a
heat sink that preven::; excessive heat
f:om damaging the div ie or tranistor.
BATTER? MATNTENANCE.
ofa BA-
elect 01:Le,a r.0;haion of perasiai. hy,ftoxile (KOE)
ha ing a normal specific gravity of 1.300 at -"-:" F. The speei..ie
gravity does no chan,.le appreciably between charge and lis-
char; . The electrolyte level should be checked onl: -1cer the
rat tory h- teen enafled. Add water as rtluired to bring t
electrolytr Level to che red llne, but nct dove it. Whenever
water is added, thorodghly wash and rinse the vent plugs win
if
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waLer before replacing.
Not e
When charging at hiAh :ates, gassing will cause
the electrolyte to rise above the red line. Do
note remove this apparently excess electrolyte.
The level will drop back when the battery stan.j.s
on open eizcuit.
A non-corrosive, harmless deposit of potassium carbonate (white
crystals) mav appear on the cell tops. Brush or wash it off
polio ically.
Precautionary Notes. The followir.;,, pr2cautions should be
observed to avoid ,aamage to ',Are bat try or harm to personnel.
I. KEEP OPEN FLAMES OR SPARKS AWAY FROM THE BATTERY -
PARTICULARLY WHEN IT IS BEDIC C7:AUED.
2. DO NOT SPILL LiE ELECTROLYTE OP CLOTHES OR SK:N.
IN CASE OF ACCIDENT, WASH WIT1 VINEGAR OR SATURATED
BORIC ACID SOLUTION AND RINSE FREELY WITH WATER.
3. Sulfuric acid, as us,2d in 1- -acid batteries,
will cause permanent cl,rage to the BA-3 Battery.
Do not adci sulfuric acii to the cels, ang do not
use any tools (such as hy(i:ometers or funnels) that
have been used previously with lead-acil batteries.
4. Do not discharge the battery beyond its rated
capacity. Follow the instructions contained in
paragraphs 2-3 and 3-3 to determine useal,ilitv of
the battery.
5. DO NOT CHARGE THE BATTERY CELLS WHEN REMOVED FROM
BATTERY CASE.
16
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,or
Use of AC-5 for Battery Ch-,Irsing. With the line-selecto:s 'itch
in tbe OFF position, plug the battery into the power supply and
connect the line cord of the AC-3 to the a-c powcr source.
(Rer to pa:agraph 2-3.) FiL'.ure 3-2 shows the operating controls
of the AC-3. Rotate the line-selector switch clockwise until the
pointer of the AC-3 meter is in the green segment of the scale. The
battery will fully charged in approni....lately one hour. If the
iniLial charging rate is too ht1, as in:ic..tcl by excessive
gascinGof the battery cells, select iac next -higher position
(councerclockise) of the line-selector s1tC.) for about 13 iriuts
Use of BC-3 Lor Battery Chargine. Fiure 4-1 sheN,L; the oper,:tin..,
controls o the BC-3 Battery Charger. To charge a 1;A-2 T...ttery,
proceed as c1 Loos:
Step
With the inn-selector switcb in the OFF position,
plug the battery into the BC-3 and conuect the BC-3 line cord
to L.1, a-c power source.
Not
The circuit breaker ih the line-cord
compartment Lust be on (handle down)
for operation GI:. the battery charger.
Step 2. Rotate the line-sel:!cco,- witch clockwie until
the F:cter indication is in the green segment of the scale.
Step 3. Allow !=lic battery to charge for several hours
(overnight, if possible).
Note
If the line-,elector switch is set below the
line voltage, the protective ci..cuit breaker
within the BC-3 wiil open. Select the next
higher position of the witch (counterclockwise
rotation) and reset the circuit breaker.
17
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Line Cord Compartment
Line-selector Switch
Figure 4-1. BC-3 Battery Charger, Operating Cnt7:ols
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