THE VUS-21 AUXILIARY REMOTELY SUPPLIED REPEATER STATION

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81-00280R000200090008-9
• Release Decision: RIPPUB
• Original Classification: U
• Document Page Count: 7
• Document Creation Date: December 22, 2016
• Document Release Date: April 8, 2011
• Sequence Number: 8
• Publication Date: November 8, 1956
• Content Type: REPORT

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CIA-RDP81-0028OR000200090008-9
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THE VUS-12 AUXILIARY REMOTELY SUPPLIED REPEATER STATION
Vestnik Svyazi
[Communications Herald],
No 8, 1952, Moscow,
Pages 3-5
Yu. D. Farber and
D. Ye. Pekarskiy, engineers,
and G. N. Stepanov, engineer,
Stalin Prize Winner
The article describes the purpose and the means of switching and
supplying the VUS-12 station (auxiliary remotely-supplied repeater sta-
tion of the 12-channel system of high-frequency telephony over aerial
communication lines). The block diagram and the principal electric
parameters of this station are given and its distinguishing features
discussed.
The VUS-12 auxiliary remotely-supplied repeater stations are intended
to maintain normal operation of the channels of the V-12 system under unfa-
vorable meteorological conditions. (A description of the V-12 system can be
found in the periodical Vestnik Svyazi [Communications Herald] Nos 6, 7, and
11, 1951.) These stations are placed in trunk lines that are carrier-chan-
nelized up to 143 kc, between the PV-12 or OV-12 stations. In the summer-
time the VUS-12 stations are disconnected from the trunk line. In the fall
and winter period one connects the filter equipment of the VUS-12 station
into the circuit that is carrier-channelized by the V-12 system and this
makes it possible to connect the repeater equipment into the transmission
channel by remote control. The repeater equipment of the VUS-12 station is
switched on and supplied separately for each direction of transmission, as
required, by applying the plate voltage from any of the neighboring PV-12 or
OV-12 stations to the corresponding wire of the carrier-ch.annelizedcircuit.
To prevent sharp changes in the transmission-level diagram, the gain of
the repeater equipment of the VUS-12 station is 0 nep for all the transmitted
frequencies at the instant that this equipment is switched into the transmis-
sion channel. The gain of the station is gradually increased to the required
value, with the aid of ARU [avtomaticheskaya regulirovka urovnya -- automatic
level-regulation] installations, which-are regulated by the control currents
of the V-12 apparatus. If the meteorological conditions improve so that there
is no further need for operating the VUS-12 station, the gain of the repeater
equipment is automatically reduced to a 0 value. The voltage at the supply
stations is then automatically disconnected and the VUS-12 repeater equipment
is disconnected from the transmission channel.
If the PV-12 stations are far apart (more than 125 km) it is possible
to install two VUS-12 stations between these stations. With such an arrange-
ment of the stations the repeater equipment of the VUS-12 may be connected to
the transmission channel for a long time.
The measurement power levels of the sideband frequencies of each of the
channels of the system at the output of the VUS-12 station are 0.5 nep. The
minimum permissible reception level is taken to be 7 nep. The amplifying
capacity of the station for the highest transmitted frequency is 7.5 nep and
permits compensating for the attenuation of a section of copper circuit up
to 71 km long under "frost 25 mm" conditions. The frequency characteristic
of the maximum gain of the VUS-12 station therefore corresponds to the fre-
quency attenuation characteristic of a section of copper circuit 71 km long
under "frost 25 mm" conditions.
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The block diagram of the VUS-12 station is shown in Figure 1. When the
remote supply is disconnected, the transmission channel contains line filters
D-33 and K-33, directional filters D-88 and K-88, and the Vyr [vyravnivateli
filtrov -- filter equalizers] which compensate for the distortion produced by
the filters at the edges of the transmitted bands. The D-33 filters permit
passage of the d-c telegraph current, the tonal-frequency channel currents
and the currents of the V-3 system, while filters K-33 pass the channel cur-
rents of the V-12 system.
The supply to the tubes that are contained in the equipment assembly
for a certain direction of transmission is connected to the energized wire
with the aid of the RPDP [rele priyema distantsionnogo pitaniya -- remote-
supply reception relay]. Two RChT [rele chastotnogo tranzita -- frequency
transit relays] are connected in series with the cathode of one of the tubes
in each of the transmission directions. After the tubes become heated and
the cathode current reaches a certain value, the PChT relay operates and con-
nects to the transmission channel the repeater equipment for a given direc-
tion of transmission. Thus, if wire one is energized (by any of the neigh-
boring PV-12 stations), the tubes in the transmission direction A-B heat up
and relays RChT3 and RChT4 operate. But if the voltage is applied to wire 2
the tubes in the direction B-A heat up and relays RChTI and RChT2 pull in
their armatures.
After relays RChT1 and RChT2 operate, the currents of the lower fre-
quency groups (36--84 kc) pass through the repeater equipment, with the
transmission channels consisting of the following: VU1 [vvodnyye ustroystvo
-- lead-in equipment] and filters K-33 and D-88 of the B side, Vyr1 [vyrav-
nivatel' filtrov -- filter equalizer] of the B--A direction, Udl [udlinitel'
-- lengthener], the contacts of the RChTl relay, the networks and KNR 1 [kon-
densator naklonnoy regulirovki -- capacitor of the sloping regulations],
KPR1 [kondensator ploskoy regulirovki -- flat regulation capacitator] C1,
Usl [usilitel' -- amplifier], contacts of relay RChTl, filters D-88 and K-33,
and the lead-in equipment VU2 of the A side.
When relays RChTl and RChTd operate, the transmission channel of the
upper frequency group (32--143 lic) will consist of lead-in equipment VU2 and
filters K-33 and K-88 of the A side, one of the 2 ("flat"or "sloping") filter
equalizers Vyr9 of the A--B directions, the contacts of relay RChT3, the flat
regulation capacitor KPR2, DU [dopolnitel'nyy usilitel' -- supplementary
amplifier], low-pass filter D-153, networks and capacitor of sloping regula-
tion KNR2, amplifier Us2, contacts of relay RChT4, filters K-88 and K-33, and
lead-in equipment VU1 of the B side.
The functions of almost all the elements contained in the transmission
channels of the VUS-12 stations are he same as of the corresponding elements
of the PV-12 stations; we shall th:i-Cfore examine only the distinguishing
features of the VUS-12 apparatus.
In order to match the input impedances of the lead-in cable to the sta-
tion equipment, the lead-in equipment of the VUS-12 station employs newly-
developed matching auto transformers which permit remote supply of the ap-
paratus over each of the wires of the network separately. It must be nested
that these auto transformers will be employed also in the OV-12 and PV-12
stations. The circuits of the D-33 filters have been modified so that they
can pass direct current over each wire of the transmission channel. The
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 line and the directional filters employ terminations that consist of half-
links of the mm' type; this limits the reflection coefficient, caused by
failure of the input impedance of the apparatus to match 600 ohms, to not
more than 10% for all frequencies transmitted aver the carrier-channelized
circuit.
The filter equalizer in the B-A direction is so designed that the total
attenuation of the two K-33 filters, the two D-88 filters, and the equalizer
itself is within 0.5 ? 0.05 nep in the frequency band of 36--84 kc. The
"flat" filter equalizer of the A--B direction maintains the total attenua-
tion of both K-88 filters and the equalizer within 0.5 ? 0.05 nep for the
92--143 kc frequencies, while the "sloping" equalizer of the same direction
is so designed that the frequency characteristic is a straight line passing
through the following points: 0.5 nep at 92 kc and 0.25 nep at 143 kc.
The lengthener connected at the output of the filter equalizer of the
B--A direction protects the amplifier of this direction against overloads
by currents at frequencies near 36 kc; this overload can occur if the sec-
tions adjacent to the VUS-12 are short. The sloping regulation networks of
the B--A direction are so designed that the difference in amplification of
the VUS-12 at 84 and 36 kc is 2.7 nep. The sloping regulation networks of
the A--B direction produce a 2.3 nep difference in the gain at 143 and 92 kc
frequencies in the VUS-12 equipment.
The amplifiers of both directions of transmission have identical cir-
cuit diagrams and differ only in the output transformers and in the arrange-
ment of the parts. Each have 3 stages of amplification. The first 2 stages
-- voltages amplifiers -- contain one type-12Zh1L tube each. The last (out-
put) stage contains 2 tubes of this same type, connected in parallel. The
stages are resistance coupled. The amplifiers have high-impedance inputs
and the output impedance is 135 ohms. The value of the negative feedback,
which includes the entire amplifier, is 2.6 nep. The gain for all fre-
quencies of the transmitted band (with the feedback chain connected) is
within 6.3 ? 0.05 nep. To obtain the required gain at 92--143 kc, a sup-
plementary single-tube amplifier employing a 12ZhIL type tube is connected
in the transmission channel of the upper frequency group. Its gain is 2.5
? 0.05 nep for the frequencies from 92 to 143 kc.
In addition to the elements indicated above, which form the transmis-
sion channels, the VUS-12 equipment also contains ARU installations as well
as installations for the reception of remote supply. The ARU installations
of each direction of transmission contain the following: (1) two PKK [pri-
yemniki kontrol`nogo kanala -- control channel receivers] CCR (flat and
sloping regulation); (2) 50-cycle generator G to supply the AIPR [motor
ploskoy regulirovki -?- flat regulation motor] and the AINR [motor naklonnoy
regulirovki -- sloping regulation motor]; (3) motor-capacitor block,
identical. with that used in the PV-12 station; (4) control panel for the
ARU, with relays RPR and RNR which control the flat and sloping regulations.
Unlike the control-channel receiver of the PV-12 static.i, each receiver of
the VUS-12 station employs two 12ZhlL tubes and has a somewhat higher gain.
The 50-cycle generator consists of a generator stage with one tube and an
amplifying stage with 2 tubes, all of the 12Zh1L type.
The control panels for the ARU, which differ somewhat from the cor-
responding units of the PV-12 stations, as well as the devices for transmit-
ting and receiving the remote supply, will be described below.
ARU Control Diagram
The movement of the regulating motors is controlled by means of relay
- 3 -
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circuits (Figure 2). The rectified control currents of the flat and sloping
regulations, which flow through the working windings of sensitive polarized
relays RPR-P and RPR-N (type RP-5), attempt to press the armatures of these"
relays against the contacts marked on the diagram by the letter L. However,
if the control currents at the output of the VUS-12 have normal levels, the
fact that the auxiliary currents passing through the compensation windings
act in opposition keeps armatures of these relays in the central position.
If the control-current level rises or falls, the armature of the correspond-
ing polarized relay will be thrown over to the right or to the left contact.
As a result, relay RNU or RVU operates and starts motor MPR for the flat reg-
ulation or motor MNR of the sloping regulation to turn in one direction or
the other.
Low-sensitivity ("coarse") RAB [rele avariynoy blokirovki -- relays for
emergency blocking] are connected in series with the sensitive polarized re-
lays in the circuit of the rectified control currents. When the control cur-
rent stops flowing or if its level drops sharply, the corresponding emergency
blocking relay interrupts the circuit to the armature of the RPR relay and
consequently stops the particular regulation motor.
At the instant that the repeater equipment is switched in, when the
gain is 0, the ARU regulators are at.their 0 positions. The movement of the
flat regulators from the 0 position to the 100 position corresponds to an in-
crease in gain for all the transmitted frequencies.
In order automatically to switch on the repeater equipment, eccentrics
are placed on the shafts of the flat-regulation capacitors of both directions
of transmission. These eccentrics act on the springs of the DKG [dopolnitel'-
naya kontaktnaya gruppa -- supplementary contact group] and are so mounted
that the contacts of the DKG are closed whenever the flat regulator is in a
position that does not exceed a previously chosen limiting position, and are
open at all higher values. The limiting position of the regulator, at which
the above-mentioned contacts close, corresponds to a value of gain that per-
mits connecting the amplifier from the transmission channel without damage
to the action of the system channels.
If the gain of the VUS-12 station does not exceed the limiting value
and if at the same time the control current level of the flat regulation is
too high, the RPD [rele prinuditel'nogo dvizheniya -- forced-motion relay]
will operate through the closed contacts of the DKG. The contacts of this
relay short out one winding in each of the polarized relays RPR-P and RPR-N.
This causes the armatures of the latter to press against the contacts (re-
gardless of the level of the control current at the output of the VUS--12) in
such a way that the flat and sloping regulation motors start rotating towards
the 0 positions. When both regulators reach the 0 positions, a circuit is
formed for operating the remote-supply relay. As a result the remote-supply
relay will open the supply circuit to the tubes, the RChT relays will release
their armatures and the repeater equipment of the particular transmission
direction will be disconnected from the transmission channel.
Equipment for Transmission and Reception of Remote Supply
As was already indicated, the VUS-12 station is fed from the power sup-
plies of the neighboring PV-12 or OV-12 stations. The supply is fed from the
plate batteries located at these stations and having a voltage that is main-
tained at 206 v ? 3% with the aid of ARN [avtomaticheskiye regulyatory nap-
ryazheniya -- automatic voltage regulators]. The supply current passing
through each of the wires has a nominal value of 160 ma. The nominal value
of the voltage at the VUS-12 is 160 v. in order to obtain this nominal
elf d:.'-'?4rent 1Pnzt1%s , tb-. remo*--~!--up"ly equipment contf lens
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regulating rheostats, which bring the supply resistance up to a definite
value.
The equipment used for the transmission of the remote supply consists
of a choke panel and a remote-supply transmission panel. The choke panel is
designed to feed the supply to four VUS-12 stations and can be placed on the
PSVK rack of the PV-12 station or on the OSVK rack of the OV-12 station.
The remote-supply transmission panel is designed to feed a single VUS-12
station. This panel can be placed on any of the racks of the OV-12 or PV-12
stations at a place that is easily accessible to service personnel.
The former panel contains 4 independent sets for connecting the plate
voltage to the circuit wires. Each set consists of a supply choke with 2
windings, 2 isolating capacitors, and an RTT [rele telegrafnogo tranzita --
telegraph-transit relay]. When the remote supply is switched off, the choke
windings are disconnected from the circuit wires, and the isolating capaci-
tors, connected into the wires, are short-circuited by the contacts of the
RTT relay. When the supply is switched on, however, the RTT relay operates,
joins the choke windings to the line wires and removes the shunt from the
isolating capacitors which block the passage of the remote-supply current
into the station apparatus.
The following are mounted on the remote-supply transmission panel:
(1) switches for connecting the plate battery to each of the wires of
the circuit, (2) meters for the remote-supply voltage and current in the
wires, (3) a rheostat for regulating the supply current, (4) a set of relays,
which disconnect the supp::y voltage from the wire (if the current in the
latter changes by more than ? 40% from the nominal value), and connect visual
and audible signals;.
The equipment for the reception of the remote supply (Figure 1) com-
prises a choke panel and 2 remote-supply reception panels (one panel each for
each transmission direction). The reception choke panel contains two Dr
[drosseli -- chokes] which are connected to the wires of both sections of the
lines adjacent to the VUS-12 station, 2 isolating capacitors, and a telegraph-
transit relay RT1. Mounted on the reception panel of the remote supply are
sets of RPDP relays with which the filament and plate supply circuits for the
tubes in any given transmission direction are connected to a specified wire
in the circuit.
Structural Design of the VUS-12 Station
The basic equipment of the VUS-12 station is mounted in 2 moisture
proof metal cabinets measuring 1,573 x 670 x 450 mm. Each cabinet has 2
doors and is filled with equipment on the front and on the back side. The
protective devices, the lead-in and switching equipment, and the cut-off
filters, intended to be connected to parallel circuits, should be placed
separately.
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V I r,% l
Direction B-A(36-84kj 1
D 33
K -38
RChTJ
A= PKK, flat regulation Choke panel for reception
B = PKK sloping regulation of reception of remote supply
C = Vyr2 "flat" D=vyr2"sloping" Figure 1
RN U
Auxiliary current
yRPD
K 88
Direction A-B c
(92-143 kc)
D 33
E = RPDP, direction A-B
F=RPDP,direction B-A
FIM gcce t is
K4. ~Ir
PR;