AP-3A POWER SUPPLY INSTRUCTION MANUAL

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03535A002000060006-6
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 7
• Document Creation Date: December 27, 2016
• Document Release Date: February 27, 2013
• Sequence Number: 6
• Content Type: MISC

Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A002000060006-6
AP.3A POWER SUP;IY INSTRUCTioN AND/AL
1.0 Genera1 Information
1.1 introduction
The AP-3A is a lightweiht power supply capable of supply.,
ing 12 volts dc to an AT-3 transmitter, or recharge a 12 vat dc battery.
The ac power source for the AP.3A can have a frequency range of 50 to 400
cycles per second, and a voltage range of 75 to 270 volts rms.
This manual is divided into sections consisting of operating
instructions, theory of operation and parts list.
1.2 Electrical Specifications
Input voltage . 75 to 270 vac rms
absolute limits
Input frequency . 50 to 400 cps
Operating ambient temperature -20?C to +50?0.
Storage temperature .65?C to
Output voltage . no load . 12.5
. 15
+85?C.
vdc +2-1/2% (power supply)
vdc +5% (battery charger)
Full load - 12 vdc +2.5% (power supply)
Output ripple from power supply 225 my rms at full load as
defined below.
Load - peak load current 1.0 amperes
average load current - 6 amperes (all tests were
performed using an AT-3 transmitter operating in the 1DY mode for one hour.)
1.3 Physical Specifications
Weight - 7.5 lbs.
Size -
1.4 Controls and Indicators
"ON" switch . push button (located on left end plate)
Ilds document Is part of an Integrated
tile. It separated from the file it must be
subjected to individual systematic review.
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Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A002000060006-6
-2-
"OFF" switch - push button (located on left end plate)
CB1 - Circuit Breaker (located on left end plate)
"PWR ON" light (located on left end plate)
"BATT" light (located on left end plate)
"FUWER SUPPLY 12 VOLTS DC" connector (located on right end plate)
"BATTERY 15 VOLTS DC" connector (located on right end plate)
Power Cord (located on left end plate)
2.0 Operating instructions
2.1 Equipment interconnection
The AP-3A contains two connectors for operation with either the
AT-3 transmitter or charging a battery pack. For operation with the AT-3,
the connector labeled "POWER SUPPLY" 12 volts d.c. is used. For use as a
battery charger, the connector labeled "BATTERY", 15 volts d.c. is used.
2.2 Operating _Instructions
2.2.1 Power Supply
1. Unwind power cable from a compartment located at the left
hand side of the AP-3A case and connect to an a.c. power source ranging
from 50 to 400 cps at 75 to 270 volts rms.
2. To turn unit on, press red "ON" button and red "PR ON" lamp
will light. To protect the power supply there is a ten second delay circuit
which will prevent the unit from being turned on immediately after being
connected to the power source or after being turned off.
3. To turn unit off, press black "OFF" button.
2.2.2 Battery Charger
1. Connect battery (see paragraph 2.1)
explained in paragraph 2.2.1.
and turn on AF-3A, as
Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A002000060006-6
Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A002000060006-6
-3-
2. The battery charging rate is indicated by a light labeled
"BATT" located on the left hand side of the AP-3A. When this lamp is
bright, the battery voltage is low. When the lamp goes off, the battery
is fully charged.
3.0 Theory of uper3tion
3.1 Introducticn
This section contains the theory of operation of the AP-3A.
It is divided into a general discussion of the overall unit and a detailed
discussion of the major sections.
3.2 General Discussion
A block diagram of the AP-3A is Presented in Figure 1. An input
voltage ringing in magnitude from 75 to 270 volts rms and 50 to 400 cps
in frequency is applied to the phase controlled bridge rectifier circuit.
The phase control circuit uses silicon controlled rectifiers to convert
the wide range of ac input voltages to a constant 80 volts d-c.
This 80 volt dc output is applied to a d-c to d-c converter through
an overload protedtion circuit. The protecticn circuit senses the 80 volt
dc and the converter current. if either of these become excessive the
circuit opens up, removing the 80 volt dc fromthe converter.
The converter provides isolation between the 12.5 volt dc output
and the input line voltage. The Eb v lc is che77cd at a 5.3 Kc rate.
FoUr transistors arranged in a bridge configuration perform this function.
The converter output is rectified and filtered and applied to a series
regulator circuit.
The regulator decreases the a-c ripple voltage and provides 12.5
v dc or 15 v dc for charging a 12 v dc battery pack. Operating in conjunc-
Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A002000060006-6
Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A002000060006-6
tion with with the regulator is a current limiting circuit, which prevents more
than 18 amperes from passing through the series regulator. Both the
current limiting and overload protection circuits will operate when the out?
put is short circuited.
Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A002000060006-6
Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A002000060006-6
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Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A00200006000676
Declassified and Approved For Release 2013/02/27: CIA-RDP78-03535A002000060006-6
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