INSTRUCTION MATERIAL FOR CONTROL DEVICES FOR SYNCHRONOUS CONTROL AND CARRIER LOCKING (SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001300010004-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 16
• Document Creation Date: December 23, 2016
• Document Release Date: August 15, 2013
• Sequence Number: 4
• Publication Date: May 12, 1954
• Content Type: MISC

Declassified in Part - Sanitized Copy Approved for Release 2013/08/15: CIA-RDP78-03424A001300010004-4
CONFIDENTIAL
IICTRUCTION MATERIAL
For
CONTROL 1?EVIC,'.2.5 .,FOR
SYNCHRONOUS CONTROL:ANIY,
CARRIER LOCKING_
50X1
50X1
DOC REV DATE 24 igat By ewys-yo
ORM COMP .0-5-4 OPI --5-6 TYPE .7C)
ORIG CLASS PAGES /4P REV CLASS JUST .2. NEXT REV r..70/5 AUTON IR 1114
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tr.)
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CONTROL DEVICES FOR SYNCHRONOUS CONTROL AND CARRIER LOCKING
SPECIFICATIONS
ANTENNA UNIT: (Adapted from existing design by permission-fox field test-
ing-Model DS-2)
Rack mounting chassis: 19 in, wide by 7 in. high
Finish: grey, wrinkle
Input Frequency Range: 4 mc to 10 me
Input Impedance: 100 ohms (two antenna inputs)
Output Impedance: 100 ohms (to receiver antenna)
Power Requirement: None
CONVERSION UNIT: (Designed as per contract)
Rack mounting chassis: 19 in, wide by 8-3/4 in. high
Finish: grey, wrinkle
Input Impedance: 100 ohm cables from two receiver 455 kc outputs
Output Impedance: two 100 ohm cables for receivers 3g5 mc conver-
sion voltage
Audio Output Impedance: two 600 ohms balanced lines (to 'lead lina or radio
link)
Audio Output Level: 1 volt
Power Requirement: 115 volts, 60 cps, 50 watts
CONTROL UNIT (Designed as per contract)
Rack mounting chassis: 19 in wide by 8-3/4 in, high
Finish: grey, wrinkle
Input Impedance: two 600 ohm balanced lines (P2om land line or
radio link)
Output Impedance: 100 ohms (slave oscillator r.f. output to trans-
mitter)
Output Voltage: 3.5 volts rims
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SECURITY INFORMATION
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Output Frequency Range: 4 me to 10 me
Power Requirements: 115 volts, 60 cps, 70 watts
AUXILIARY EQUIPMENT REQUIRED:
Two Hammarlund SP600 redeivers? (not furnished).
One cathode follower adaptor, furnished. (cathode follower to mount on
side of crystal plug-in box of receiver with cable and adaptor to plug
into 6V6 output socket for power, alligator clip to tap off oscillator
switch, and output plug for HFO slave voltage).
One HFO slave voltage cable with plug-in assembly, furnished, (connects
from cathode follower output to #6 crystal input of slave receiver).
Two 3.5 me conversion voltage cable assemblies, furnished, (connect from
Conversion Unit 3.5 me output into the 604 conversion oscillator sockets
of the two receivers).
Two cables for 455 kc i.f. outputs of receivers to the Conversion Unit,
(not furnished),
One cable for connection between Antenna Unit and Master Receiver, (nab
furnidhed).
DESCRIPTION
This equipment comprises a system for ynchronous frequency operation of
two transmitters, whereby one is slaved to the other. Provision Also is
.made to hold the Slave Transmitter at a fixed offset frequency from the
Master Transmitter if desired. Five fixed offset audio frequencies are
provided ranging from 2000 cps to 6000 cps. In operation, at a monitoilft
?
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SECURITY INFORMATION
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or sensing site, the signal from the slaved transmitter will tend to
predominate over the Master Transmitter signal due to its closer phy-
sical location? This signal from the slaved transmitter can be fed to
one receiver without further processing. The other signal, which is
comparatively low in strength, must be made to predominate over the
stronger signal in the second receiver? This is accomplished by null-
ing out the strong signal, The Antenna Unit is used to accomplish
this nulling effect. The total equipment incorporates self contained
power supplies. The SP 600 receivers are used without modification
except for adaptors and plugs which are connected to the receivers
without soldered connections. Adaptors and plugs which are peculiar
to this equipment are described and furnished,
THEORY OF OPERATION
A simpler version embodying the present type of operation is shown
in Figure 1. This equipment synchronizes a local oscillator with
an incoming signal. A two phase beat signal is developed which is
used to drive a two phase motor. As the local oscillator is brought
into synchronizationothe beat frequency decreases, approaching zero
in the For this reason the amplifiers driving the motor are
direct coupled.
For the present application a control or error voltage must be sent
out over a radio 205k or land line circuit. This precludes sending
out either the r-,1" oscillator signal, or the control voltage for the
motor, which latter may be direct current. Also the Slave Transmitter
output maybe a harmonic of the r-f oscillator signal, and it may be
located some miles from the receiving site. These circumstances dictate
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the use of two receivers at the receiving site--one for each signal,
These receivers must have common conversion oscillators to eliminate
any sustained frequency difference between the incoming signals when
they are finally combined in a discriminator circuit.
The final circuit, used for synchronous lock, functions the sathe as
that shown in Figure 1 except for one intermediate step, which permits
sending audio over the radio link (it is not necessary to have d-c re-
sponse)? This exception involves the use of one beating oscillator
stage which employs separate (net common) oscillators for the two re-
ceiver channels. These oscillators are at 100 kc and 102,5 kc respec-
tively. The receiver output from Mixer 0 is then 2.5 kc? a frequency
adapted to sending over the land line or radio link. The outputs from
the offset oscillators are applied to another mixer yeilding a 2,5 kc
output, which is applied to a second land line or radio link,
Attention is directed to pointsland Yin Figure 1. These two audio
signals obtained may be processed exactly as the two r-f signals at X
nnd y The foregoing explanation applies to synchronous frequency op-
eration.
Offset tone operation is very similar to the above. However, the off-
set beating oscillator is not directly used, and the oscillator differ-
ence frequency signal is no longer sent out over the land line or radio
link, Instead an audio oscillator at the transmitting end is used as a
reference for the beat between the nester nnd the slave station. From
this point on, operation is exactly the same as with synchronous oper-
ation, In both types of operation lowpass audio filters have been pro-
vided to keep frequencies other than the low frequency beat from reach-
ing the amplifiers,
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SECURITY INFORMATION
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Detailed function of stages shown in the block diagram is as follows:
The Master Receiver mast receive the signal from the Master Tremenitter
(Reference Carrier) only. Since this signal is of the same frequency
as that of the Slave Transmitter, and in practice, will be the weaker,
the Antenna 'Unit is inserted in this line to assure acceptance of the
Reference Carrier only. The greater strength of the Slave Transmitter
signal, due to relative proximity, makes it unnecessary to employ a
bearing discriminating (Antenna Unit) type unit.
In order to provide both receivers with the same first conversion fre-
quency, the BFO voltage of the Master Receiver is fed to the Slave Re-
ceiver through a cathode follower and plug-in adaptor assembly. The
second conversion voltage is obtained from the 3.5 mc crystal controlled
oscillator in the Conversion Unit, Adaptor plugs are used to plug into
both receivers 604 second conversion oscillator sockets. The 455 ke i-f
output of the Slave Receiver is fed to Mixer A and the Master Receiver
feeds into Mixer B. The above stages function identically for both Syne.
Lock and Offset Tone circuits.
Figure 1A: Sync Lock Circuit
Conversion Unit:
The 100 kc oscillator voltage is combined with the Lf. from the Slave
Receiver in Mixer A to give a resultant of 352.5 ke (any slight
difference, due to drift in the Master Transmitter, etc., which may oc-
cur between the two transmitters). This is then sent through a 'limiter-
amplifier stage and fed to Mixer C. The 102.5 kc oscillator voltage is
combined with the i.f. from the Master Receiver in Mixer B to give a
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resultant of 352.5 Ice. This is also fed to Mixer C through a limiter
-
amplifier stage. Combining the two signals in Mixer C results in a
2500 cps LAf output which is amplified and sent over a balanced line
to the Control Bait. The 100 kc and 102.5 kc crystal oscillators also
are fed to Mixer D to yield an 'output of 2500 cps which also is ampli-
fied and sent over a balanced line to the Control Unit,
Control Unit:
The output of Mixer D is split, with one part going through a 900 phase
shifting network and fed to separate phase discriminators, The output
of Mixer C is also split, going directly to the phase discriminators to
be compared with the Mixer D signal, In comparing these two signals, if
there exist any phase relationship other than 00 in the one line and 900
in the other, there will exist an audio voltage output which is propor-
tional to the phase displacement from qundrature. This audio voltage
goes through a lawpass audio filter network to remove extraneous compon-
ents (i.e. 2500 cps component), and thence to an Amplifier stage. The
Amplifiers drive a Two Phase Motor assembly which in turn drives a var-
iable capacitor which controls the frequency of the Slav'Transmitter
to hold it in Synchronism with the frequency of the Master Transmitter
Figure 2: Offset Tone Circuit
Differences between Offset Tone and Sync Lock operation are:
Conversion Unit:
a. 100 Ice oscillator is not used, allowing Mixer D and its
amplifier to be inoperative.
b. 102.5 ke oscillator feeds both Mixer A and B to create
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SECURITY INFORMATION
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their output difference,1,Af, which will appear at the out-
put of Mixer C. This is then amplified and sent over the
balanced line to the Control alit.
Control Unit:
An Audio Oscilintor, which has 2, 3, 4, 5 and 6 Ice positions, is used
as a reference voltage. This establishes the Slave TranAmitter Carrier
frequency exactly that far removed from the Reference Carrier frequency.
CONTROLS AND atilt FUNCTION
Antenna Unit:
L - PEASE - Course phase adjust (distributed constant phase changer).
2. - VERN. PH. - Vernier phase adjust (variable capacitor).
3. ANPL. - Course amplitude adjust (250 ohm pot).
40 - VERN. AM. - Vernier amplitude adjust (50 ohm pot).,
5. - ART. SWITCHING - Interchanges antenna inputs.
Conversion Unit:
1. - R101 - AWL. 2 - Vary amplitude of crystal dIfference output
voltage.
2, - R102 - AMPL. 1 - Vary amplitude of Mixers A and B difference
output voltage.
3,
- Si
- Power non-off" switch.
4.
- S2
- Change from Syne Look to Offset Tone operation,
5.
- S3
- Second conversion voltage ?on-off" switch,
6.
- 84
- Neter selector switch for Line A and Line B.
Control Unit:
1. - 0101 - Main tuning condenser.
2. - C102 - Vernier capacitor to control oscillator,
3. - E101 - Control to position C102.
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- R101 - Vary amplitude of Line A input,
50 - R102 - Vary amplitude of Line B and Offset Tone Oscillator
input.
6. - 31 - Power "on-off" switch.
7. - 52 - Sync Lock - Offset Tone select. f4F. This has 6 positions
and selects the proper phasing network for the specific
frequency used,
SETUP PROCEDURE
1. Connect line between Conversion Unit and Control Unit,
2. Connect the two antennas to the input of the Antenna Unit,
3. Connect output of Antenna Unit to the input of the Master Receiver.
4, Attach to the Master Receiver, the Cathode Follower Assembly on the
side of crystal box, aligator clip to oscillator switch, and adaptor
plug in the 6V6 output socket replacing the 6V6 in the adaptor.
5. Connect FIFO Voltage Cable from the output of tlie Cathode Follower As-
sembly to the #6 crystal position of the Slave Receiver (turn crystal
selector switch to position 6),
6. Remove the 6C4 second conversion oscillator tube of both receivers and
plug in the Second Conversion Voltage Cable ft-Om the 3.5 mc output of
the Conversion Unit to the 6C4 socket of both veceivers.
7. Connect cable from IF Output from Master Receiver to 31 and Slave Re-
ceiver to J2 of Conversion Unit,
8, Connect Control Unit output (31) to Siave Transmitter External HFO input,
9, Connect scope to 32 of Control Unit.
IO. Set pointer of E101 on Control Unit at 12:00 (this will be set at 6:00
if the lintt does not lock in),
11Q Determine position of S2 on the Control and Conversion Units.
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12. Determine coil to be used for HFO oscillator of Control Unit (turn
on 3,5 no oscillator switch of the Conversion Unit if the frequency
is above 7.4 me)
13. Turn all pots to minimum (CCW), and the Meter Selector Switch (14)
off.
14. Turn on equipment.
15. Tune C101 of the Control Unit to the same frequency as the Reference
Carrier,
16. Adjust the Antenna Unit for deepest null of the Slaved Transmitter
signal. Interchanging the antenna inputs may be necessary (ANT.
SWITCHING).
17, Adjust Outputs 1 and 2 on the meter in the Conversion Unit to 100
microamps with E102 and R101 respectively.
CAUTION: Output 1 varies with final tuning.
NOTE: There will be no Output 2 with Offset Tone operation.
18. Adjust Amp].. 1 and 2 of Control Unit for approximately equal maximum
amplitudes on the scope.
19. Tune C101 of Control Unit for "lock?in" condition by observing scope
and listening for zero beat in the receiver.
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v./
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SIGNAL
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Figure 1
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00?1=11?11???=1?0.4.-INIMPI.M.1.
DISCRIMINATOR
DISCRIMINATOR
AUDIO (?9O')
RF
OSC
MOTOR
AMP
AMP
BASIC SYNCHRONIZING CIRCUIT
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SECURITY INFORMATION
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FIGURE
BLOCK DIAGRAM
SYNC LOCK CIRCUIT
CIA-RDP78-03424A001300010004-4
U1U1UL1 1 lilL
Reference
Carrier
Tuning
Capacitor
2 Phase
Motor
Amplifier
Amplifier
Crystal
Osc
100 ke
Mixer A
I -
3 5 mc I
1 Crystal
Oso
'102.5 ko
455 ke
Mixer B
Lo Pass
Audio
Filter
Lo Pass
I Audio
Filter
355 kc Amp 1
84 Limiter
352.51co Amp
& Limiter
Mixer
Phase
Discriminato
Phase
Discriminator
Mixer
90?Fhase
Shift
2500 cps
Amp
500cps
5
Dual Land Line or
CONTROL UNIT Radio Link C MINERS ICU UNIT
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7
h Trns ttr
Tuning
Capacitor i
I
2 phase
motor
Amplifier 1 Amplifier
Lo Pass
Audio
Filter
- I
-7-
Phase
Discririnat
1900 Phase
Lo Pass
? Audio
Filter
? ?
Phase
Discriminator
i%
Audio
Oso.
- CONTROL UNIT
CONFIDENT/A
FIGURE 2
BLOCK DIAGTAM
(MET TOM?, CIRCUIT
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L LUMIDEN IAL
455 kc
Mixer A
Reference
Carrier /
7
r-
Antenna
giFO_Vol_Aa j
2nd Conn
Voltage'_
-- 1
3.5 me
Ose
v
352.5k0 Amp
+Af
, & Limiter
Cryatal
Osc
102.5 kc
Unit
Rovr
-401
ini -xer B
1
352.51cc Amp
& Limiter
Land Line ? dig _Link_
CONVERSION UNI
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