INSTRUCTION MATERIAL FOR SINGLE SIDEBAND UNIT (SANITIZED)

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A001300010002-6
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 20
• Document Creation Date: December 23, 2016
• Document Release Date: August 15, 2013
• Sequence Number: 2
• Publication Date: May 12, 1954
• Content Type: MISC

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CONFIDENTIAL
INSTRUCTION VATERIAL
For
SINGLE SIDEBAND UNIT
Nay 124,, 1954
Dee -2-
REV DATE
24 'NZ
By 065/3-540
ORM COMP
40-5-4 DPI
-5-4
TYPE
PAGES
_JO
REV CLASS
01110 CLASS
JUST .2-2- NEXT REV _liaPLCL AUTH: HA 104
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SINGLE SIDEBAND UNIT
SPECIFICATIONS
EXCITER UNIT:
Chassis: rack mounting 19 in. wide by 12i in, high
Finish: grey
Input: audio 1 volt 10,000 ohms
ext, HFO 3 volts 100 ohms
Output: audio 0,5 volts @ 600 ohms
2,5 volts @ 2000 ohms
rot, 15 volts G 100 ohms
Power Requirements: 115 volts, 60 cps, 135 watts
POWER SUPPLY UNIT: (Model P-1)
Chassis: rack mounting 19 in, wide by 5i. in, high
Finish: grey
Type: regulated
Power Requirements: 115 volts, 60 cps, 45 watts
CONTROLS AND itibIR FUNCTION
1, .R101---Audio gain
2? R102?Vary from square law to sine wave audio output
3, R103---Phase modulator adjust
4, R104---Square law adjust
5, R105---Phase modulator bias control
6, R106---Ba1ance pot to minimize HFO component
7, C101---Main tuning condenser
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WIF lino Itib
Esmagosx1paa_q11,14,12.4011211
Band - Out ip...E..ty:eync
A 125 to 250
250 to 500
500 to 1000
1000 to 2000
2000 to 4000
4000 to 8000
Mixer Frequency is 1/2 Output Frequency.
8, C102-Vernier9 fine tuning
9, Si --Sideband selector
10, 32 To obtain correct sense of envelope when using square law,
11. S3 ---External-Internal HFO switch
12. S4 --Meter Selector
13. S5 ---Range Selector
14,
A. Mazer output
B. Doubler output
C. Ouput plate tank circuit
D. RF output
31 ---RF output (output of 15 to 20 volts 6)100 ohms impedance)
15, 32 11F0 (required input of 2 volts min. @ 200 ohms impedance)
16. TB]. ---Audio input and output terminal strip
Output Data
2.5 volts @ 2000 ohms
0.5 volts C 600 ohms
DESCRIPTION
The Single Sideband Unit equipment provides excitation for a class C plate
modulated transmitter enabling it to radiate single sideband plus carrier,
Switch positions are provided which permit Phase Modulated operation as well
as Amplitude Modulated operation.
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A block diagram of the equipment no shown in Figure 5. Theory of Operatioa
is outlined in the following Section.
The use of a fixed oscillator permits phase modulation at one frequency.
This eliminates tuning critical phase modulator circuits in covering the
wide range of output frequencies. A balanced mixer balances out the funda-
mental beating oscillator component. This prevents the oscillator voltage
in the mixer plate circuit from predomineting over the signal voltage.
When driving a doubler* it is desirable that the component which is to be
doubled should predominate. The doubler stage is incorporated to minimize
feedback from the output to earlier stages. The output stage provides 15
to 20 volts rms at 100 ohms impedance for feeding a low level r-f stage in
the transmitter.
The audio it is amplified* then passed tiarough an audio phaser which
has quadrature output voltages as required for phase shift single side
band generation. Upper and lower sidebands are selected by reversing phase
of one of the outputs as shown. This phaser holds the 90 degree relation-
ship between outputs within 1.5 degrees from 100 cps to 3500 cps. Rela-
tive audio phase also should be this precise as measured between the phase
modulator grid and at the amplitude modulator plate. To insure this con-
dition these points are inspected using an oscilloscope and the phase is
equalized ahead of the p-m audio amplifier as required. A square law cir-
cuit is incorporated in the am line to decrease distortion of the received
signal on a single sideband receiver. For minimum receiver distortion
using a linear or diode detector on the other hand* nnormal" output is
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4.
maintained as outlined below. The phase inverter and sense switch provide
for applying the square law characteristic in the correct sense to the sig-
nal envelope. This switch has no effect when the nnormal" output is used.
The output amplifier audio provides sufficient output to feed a low imped-
ance line. This output feeds the modulation input circuit of the auxiliary
transmitter,
To obtain a given output frequency from this units a crystal or an external
input voltage must be provided for the UFO circuit. The correct IWO fre-
quency is (Output Freq. /2 ) 2.5 me. Maximum output frequency available
is 8 me. Normally there will be frequency multiplying in the transmitter
to cover the higher output frequencies. For adjusting and monitoring trans-
mitter output it is desirable to have a single sideband receivers howeverp
it is possible to use a communications receiver with selective crystal fil-
ter. Initial adjustment sets amplitude modulation level to 80%. It is
necessary to use steady tone of about 2000 eps for this adjustment. The
receiver then is tuned to the rejected sideband and the phase modulation
level control on the back of the chassis is set for minimum output from the
receiver. The 'square-law-normaln control should be set in nnormal" posi-
tion for maximum rejection. Where a single sideband receiver is available
this adjustment ma be made on program material. Adjustment of the vernier
tuning control will have some effect upon rejection of the unwanted side-
bands, as will transmitter tuning and loading adjustments,
THEORY OF OPERATION
This system is .basically the well known arrangement of Figure 1. This is
a phase shift system method in generation of single sideband signals. The
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re sent system is shown in basic form in Figure 2 It should be noted that
V2 in Figure 2 is not a balanced form of modulator, and that its r-f input
consists of the carrier shifted 90 degrees plus the modulation products
generated in Vi,. This arrangement of V1 and V2 leads to the generation of
higher order sidebands which are not present in the arrangement of Figure 1.
In practice, V1 balanced modulator and the reinserted 90 degree r-f compon-
ents are replaced by a phase modulator stage which achieves the same end-
result and at the same time eliminates two adjustrents (balance control on
the modulator and the phase control).
Vectors showing various components arising in the process of phase modu-
lation (V1) and amplitude nodulation (V2) are shown in Figure 3. The sig-
nal at the input to the limiter of Figure 2 is made up of the carrier plus
upper p-m (6) and lower p-m (5) components. The resultant scalar magnitude
is greater than the value when modulation is not present. This magnitude
varies during The modulation cycle, the result being amplitude modulation
at twice the modulating frequency. While this amplitude modulation is
chiefly second harmonic, small amounts of other even harmonics also are
present. Now as this wave is passed through a limiter stage, which removes
any amplitude modulation present, the scalar magnitude of the carrier will
remain constant. This means that additional sidebands (components 69 79
and some others not shown) have been created to cancel the amplitude eam-
ponent. Limiting is not essential to the creation of single sideband sig-
nals and the limiter could be left out of Figure 2. However, limiting will
occur when passing a signal through class C amplifier stages, therefore an
accurate representation of the system must incorporate the limiter.
Whem amplitude modulation is applied to a signal consisting of carrier (1)
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plus phase modulation components (4, 5, 6, sidebands due to the ampli-
tude modulation process are generated on all components present. New side-
bands 2 and 3 are associated with 1 (carrier: 8 and 9 are associated with
4; 10 and 11 are associated with 5; and lesser sidebands not shown are as-
sociated with 6 and 7.) Now when the amplitude modulation is at the same
frequency as the phase modulation but removed 90 degrees in phase, relation-
ships exist as shwa in Figure 3. Certain of the components are at iden-
tical frequency and add or subtract as shown in Figure 4. Laboratory tests
indicate that the level of a-m sidebands generated on components other than
the carrier is not determined directly by the a-m modulation index, but is
reduced in the ratio of the component level to carrier level. This factor
was used in arriving at the component levels indicated in Figures 3 and 4.
As a result of this reduction factor, single sideband performance becomes
better at lower modulation levels.
A square law characteristic imposed on the a-m audio will cause cancella-
tion of components shown as 6 and 7 in Figure 3. This reduces the second
order sideband on the accept side. The db relationship shown in Figure 4
becomes:
-9KC -kKC -3KC
-46111B -19DB -109DB
Carrier
4.3KC
o6KC o.9KC
0 -Inf. -19DB -46DB
Theoretical rejection at high modulation level as outlined above is 25 db
(Intermodulation in this case is 12 db). The optimum performance may be
degraded by audio distortion, phase shift of individual r-f sidebands due
to Q of tuned circuits, and excessive audio phase shift in amplitude modu-
lator stages in the
Co
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Detailed function of stages shown in the block diagram is as follows:
Bleck 1, Oscillator-Wee-606. This is an oven controlled crystal oscilla-
tor which provides a stable frequency for phase modulation,
Block 2. Phase Modulator-V2,-6A07. This stage vailles the phase of the r-f
Input in accordance with the audio input.1
Bloek 3. Balanced Nixer-V3s V4-6BE6, 6AU6. The balanced mixer combines
the phase nodulated wave from 112 with the signal from the high
frequency oscillator (HFO) to give a resultant difference fre-
quency.
Block 4. Doubler-V.5-606. The doubler multiplies the input frequency by
twos and amplifies it.
Block 5, Power Output0.V6-6AQ5, This stage provides sufficient power to
feed a low impedance line (3 watts at 100 ohms).
Block 6, High Frequency 0scillator-V7-6A07? This stage is used as a crys-
tal controlled oscillators and as an amplifier for an external
HFO inputs where that is desired.
Block 7. Audio Amplifier4V8-1207. This stage amplifies the audio input
to the required level.
Block 8. Audio Phaser Unit- (4) 1207's. The audio phaser is a subassembly
which gives a 900 phase difference between the two cathode or
plate output terminals. (Millen 900 phase shift networks Part/
Dwg. No. Ii7501l)
Block 9.3 Audio Anp1ifier4V10-1207. This stage provides the required
amount of audio for the phase modulator,
Block 10, Phase Equalizer. This is circuitry inserted to insure correct
phase between the audio and pm lines compensating for phase
shift in the transmitter amplifiers.
Block 11,, Square Law circuit-V9-1207. This circuit permits a square law
characteristic to be inposed upon the audio signal where desired
(see Theory of Operation)
Block 120 Phase Splitter4V10-1207. The phase splitter has a gain of about
0,9 at both the cathode and plates which are 1800 out of phase.
A switch permits choosing the proper phase when using the square
law circuit. This phase depends upon the input to output phase
relationship in the transmitter to be used.
Block 13. Output Anplifier-Vlls V12-12AU7s 6AQ5. The output amplifier stages
employ negative feedback to minimize distortion and provide law
output impedance.
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PROCEDURE FOR SETTING DP SINGLE SIDEBAND UNIT
1, Connect Power Supply Uhit to the Exciter Unit.
2. Connect the Single Sideband Exciter to the Transmitter.
a. The r-f auput (31) is fed to a low level r-f stage of the trans-
mitter.
b. Audio output is fed to the audio input jack of the transmitter.
The 600 ohm output should be used unless the transmitter input is
high impedance.
3. Determine HFO Frequency.
To determine the 170 frequency, divide the desired output frequency by the
number of multiplication stages used in the overall system, includtng the
doubler stage in the Exciter, and add 2,5 me to the resultant frequency,
Example: desired output frequency is 8 me. The r-f voltage is doubled
twice in the transmitter. Divide 8 me by 4 L.: 2 me? Now 2 mc 4. 2.5 me
me which is the required HFO input required at the HFO input jack.
4, Set Band Selector on desired frequency.
NOTE: Band Selector frequencies are as follows:
Band 91.1tEULIE2a.
A 125 to 250 ke
250 to 500 kc
G 500 to 1000 kc
1000 to 2000 ke
2000 to 4000 ke
4000 to 8000 ice
Mixer Frequency is + Output Frequency,
5. Turn on Equipment,
00IN
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60 Tune Exciter.
Set the meter selector switch on "Output", then adjust the main tuning mech-
anism and vernier for maximum deflection on the meter.
7, Determine Type of Envelope to be Used,
"Normal" operation should be used for least intermodulation distortion on
a stnndard receiver? "square law" operation should be used for least dis-
tortion on a single-sideband receiver. Adjust R102 for the characteristic
desired,
NOTE: To adjust the Square Lau Ci-cuit, use an oscilloscope to moni-
tor the audio output. Turn ',13102 completely to the Square Law
end as narked on the chassis, and adjust R104 for best Square
Law wave characteristic. This varies with amplitude of audio
output. input to the exciter should be set at the opti.num level,
nnd that level should correspond to 100% modulation of the
transmitter by adjustment of the transmitter audio gain control.
When using the Square Law characteristic it is'uecessary to see
that the transmitted signal envelope is in the 'orrect sense as
shown, S2 may be used to obtain the correct sense.
Correct Sense
Incorrect Sense
8, Set Audio Gain Control for Desired Degree at Modulaticu.
Apply an audio frequency of about 2000 cycles to the audio input terrinsl
(TB1-1), then with the meter selector switch on modulation, determine the
100% modulation poiat, and reduce the level as desired, CAUTION: once
the audio level is set initially, do not use the gain control of the trans-
mitter. Make all audio adjustments with the exciter gain control
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:9A. Adjust for Single Sideband Performance.
a. Using the input meter of a monitoring receiver, tune for the
first order sideband to be rejected (the receiver should be
in Sharp crystal selectivity; keep itput from transmitter
below 40 db as indicated on the receiver meter, be sure r-,f
coupling is all from transmitter output and none is direct from
the Exciter Utit)!
b, Set the sideband selector switch of the Exciter for the desired
accept sideband.
e. Adjust R103 for null.
d. Tune the vernier for a null
e, Make firm, adjustments using both R103 and the vernier control
for optimum null
9B. Using Single Sideband Receiver for NOnitoringt
A single sideband receiver has at least three different accept positions0
upper sideband
lower sideband
normal reception
a, Using the normal position, tune to the transmitter frequency.
b, Switch to the accept sideband and adjust the gain control of
receiver for maximum audio output.
c. Switch to the reject sideband and adjust the Exciter for minimum,
(a null on the audio output meter of the receiver). NOTE: To tune
the Theater for a null adjust R103 and the vernier the same as
step 9Ac.
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ALTERNATE PROCEDURE USING A DIODE LINEAR MODULATOR
Since a diode modulator approximates an almost perfect device and can be
constructed readily and inexpensively9 it becomes a very useful instru-
ment for setting up and trouble shooting the Exciter. In using the diode
modulator9 the timing of tl.e Exciter becomes simplified since the trans-
mitter does not have to be used in the setting up procedure. This elimi-
nates possible errors due to slight misadjustments of it.
When using a diode modulator9 such as the one shown below, follow the
same procedure as outlined for standard transmitters, replacing the trans-
mitter with the diode modulator.
J1 500 6/IMF
CIRCUIT DIAGRAM OF DIODE MODULATOR
1N58 -A
500 MMF
2K TBI-3
AUDIO
OUT 0 TBI -4
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F2 CARRIER FREQUENCY
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TO SCOPE
TO RECEIVER
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? Tblefr`l! -
r-f Input
audio
1 [Y.
1 90 --
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Audio
irput
1 Phe, S r
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Single sideband
F igu re 1. ha s ,..lh:11.1rt Sys te fr.yr j a a (1/41.1ner t ion
t-F4finput
Audio
Input
tAz
AudLo
Phaser
vi
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Single sideband plus
belano ed. v,arrier 3igna1
Figure 2. Variation of Phase Shift System of Single Sideband Generation.
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Relative and
kt.
a 4,
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tfrri ?IN 1.0. * ''''''''
--
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m
4
Figure 3. Vector Relationship
for Single Tone Modulation
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Vector relationship for signal
medulated 80'14 AM and .15 radial
.PM. Audio input is a. 3 Ice
sine wave.
Note: All vectors are shown
in corr.ict phase except the
carrier (1)0 which would-be
shown at the same angle as in
Figure 3 if space permitted.
a 1.
t5kc
Additivd values
.03 1.5
Ratio to carrior
200
Db relationship
-46 -l2
4 3
4S4
1
A
0
Figure 4. Addition of vectors shown
in Ftgure 3.
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\ 6
C804
p.F
600 V.
CONFIDENTIAL
VOLTS ADJUST
R802
25G0
R803
5600
e 2W
R804
5600
2W
34
'f Y
7
R806
'vVVV\--
470 K
R705
20
1 W
R809
525K
5W
0803 V804
-1.-
--r-
0.1 p F 003/VR - 105
.
1 4C0 V.
FIGURE 8
CIRCUIT DIAGRAM
POWER SUPPLY UNJT
MODEL P-1
R807
5600
2W
R808
5100
2W
CONFIDENTIAL
iSEGURI1Y INFORMATION
Declassified in Part - Sanitized Copy Approved for Release 2013/08/15: CIA-RDP78-03424A001300010002-6