THE NUS-3 UNSERVICED REMOTELY SUPPLIED AMPLIFYING STATIONS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81-00280R000100100033-7
• Release Decision: RIPPUB
• Original Classification: U
• Document Page Count: 9
• Document Creation Date: December 22, 2016
• Document Release Date: April 4, 2011
• Sequence Number: 33
• Publication Date: October 5, 1956
• Content Type: REPORT

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 Sanitized Copy Approved for Release 2011/04/04: CIA-RDP81-0028OR000100100033-7
IM-NUS-3 tVS-ic VICED RENT I .3UPPLISD AMPLIFYING STATION
Vestnik svvazi [Communications
Herald, No 11, November 1955,
Moscow, Pages 5-2
V. I. Voronin
S. A. Zarin
A. A. Sarbuchev
In 1954 Soviet industry began the series production of the NUS-3,
unserviced, remotely-supplied amplifying station, developed upon
order of the Ministry of Communications USSR. The present article
gives thn basic technical data of the NUS-3 station, examines the?
scheme,purpose,, and area of use of this station, and describes the
operation of its individual units.
ih,: ;:US-3 unattended, remotely-supplied amplifying station of the
three-channel system: of high-frequency telephony is designed for ope-
ration over copper and bimetallic open-wiry circuits in the frequency
spectrum .dopted for the 7-3 three-channel system (6.3-26.7 kc). The
IM-3 may be use: both as a constantly operated intermediate amplifying
station cnd as an ruxiliary amplifying station operating temporarily
under unfavorable meteorological conditions.
The NUS-3 nr.y be powered remotely from an adjacent amplifying station
or from local axch'nr sources of current. In the first case the NUS-3
is connected to the power circuit by transmission of the supply voltage
in the conductor of the telephone circuit, whereby at the NUS-3 the
amplifying equipment in both directions of transmission is connected at
the same tins. Upon Disconnecting the NUS-3 amplifying ecuipment a bypass
loop is created in its circuit, containing only K-5.7 filters and a
filter equalizer r7 (Figure 1).
In case the NU3-3 is used as an auxiliary amplifying station an
arrange-nent is provided whereby, in accordance with' previously,. chosen
conditions, the ztation is automatically disconnected when'line atte-
nuation decreases to a point where operation of the station is no longer
necessary.
If the 1-U3-3 is used as an attended intermediate station, it obtains
its po.:er from nearby sources: from a single plate battery or from two
batteries (a fiirmunt battery and a plate battery).
The of t;,u NUS-3 station is the same as for the PV-J
5t -,Lions and amounts to not less than 3.25 nepers
(slope char^c _r sti for freluency of 14.7 kc and not less than 5.5
napery (slop: for a frequency of 26.7 kc. The rated
zidebnna L
1 '.?? output of the NUS-3 is 1.5 nepers. The automatic
g..-in control ::hi :h the station is provided insures regulation of
the -in over -:n a of not less than 1.5 napery for the slope charac-
teristic and J. ri. a: nnrs for the flat chz racteristic.
Th.:: 03-3 u:us one type of vacuum tube, the total number of such'
tubes being 16. In crder to reduce current requirements in remote supply
the fil masts of ?11 tutees are connected in series in a single circuit.
rn~ total currant in ra::eot;: !supply of the NUS-3 does not exceed 190 ma.
;h~ vol sew :=ppli d to th. 3-3 in remote supply must lie within the
Sanitized Copy Approved for Release 2011/04/04: CIA-RDP81-0028OR000100100033-7
 Sanitized Copy Approved for Release 2011/04/04: CIA-RDP81-0028OR000100100033-7
range of. 160?' 8 volts. The station is designed for operation at tempera-
turas *rom -5 to + 1,OoC.
LOCATIDN OF THE NUS-3 STATION CM fUYK LINES .
If the NUS-3 is used in constant operation as an amplifying ,station
with remote supply, its gain will permit compensating for attenuation in
the repeater saction of a 1, am copper circuit about 250 lam in length with
a distance of 20 cm bacween conductors under meteorological conditions
of "25-:ate icing". in thi=, case from the amplifying station furnishing
the voltage supply a standard 206-volt plate battery must be connected
to the line (from the output of an S:ARN [automatic voltage regulator
panel))*
In operation of the NUS-3 on 4-= bimetallic circuits (with a copper
11yer of 0.4 r m) the greatest length of a repeater section, determining.
the grin of this st:tion, is approxi-iately 225 Ica. In order to provide
remote supply over such a distance the feeding station nust apply a
stopp3ci-up volt-j;e of cppro:cimately 240 volts to the line.
In using the NtiS-3 as an auxiliary amplifying station connected only
under severe seteorolo;;;ica_ conditions, the greatest distance frcm the
feeding FJS-J st-.lion to the NUS-3 station will be 120-130 lea. In this
case, whither operating on copper or bimetallic circuits, the NUS-3 may
be re.?,~otely fact from standard 206-volt plate b: tter;.
DIAC?tA}: OF TH ' NUS-3 STATIO:
The block .:inr;r.z of the NUS-3 is given in Figure 1. The station is
connectedi the iin through 2 protective unit consisting of SN-05
fuses, R.-350 :::d 3i3-260 disch-r ers, and r_ ble2di! coil DX. After the 11
protective 'h- circuit contains tIe units for receiving; the remote
supply -- chokes Dr and D.', and buffer capacitors C1 and C2.
Line-fiiL r -:sseably DK-5.7 and DK-2.8 as well as the matching auto-
transforners uz.,:d in the NUS-3 are similar to the corresponding
units in Lh'i a-;
The ou;.put of Lhs K-..7 relay in each direction of transmission is
connected with Lt~ ?ont-.cts of bypass-connector relay RV). If the supply
is connected (t r. t Ls, if the station is in operation), the RW relay
holds its am _turc in the dr:wn pozition, with the result'thnt the out-
put of the K-5.7 _`lter is connected to the taps of parallel connection
of the dir:.ctin Liters DK-16.1,. Upon connection of the supply this
relay closes oni~j -ft_r the total plate -rent drawn by the station
riach