AN ULTRASHORT-WAVE RADIO STATION FOR REMOTE NEWS REPORTING

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000700090516-8
• Release Decision: RIPPUB
• Original Classification: R
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: August 11, 2011
• Sequence Number: 516
• Publication Date: December 8, 1952
• Content Type: REPORT

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FOR OFFICIAL USE ONLY Gtr -:, , ,,
CLASSIFICATION RE,9TRICTED? J
W
A
CENTRAL
INTE LICENCE
GENCY
REPORT
INFORMATION FROM
FOREIGN DOCUMENTS OR RADIO BROADCASTS CD NO.
COUNTRY USSR
SUBJECT Scientific - Electronics, transmitters
HOW
PUBLISHED Monthly periodical
WHERE
PUBLISHED Moscow
DATE
PUBLISHED Jun 1952
LANGUAGE Russian
DATE OF
INFORMATION 1952
STAT
DATE DIST. Dec 1952 j. ;
SUPPLEMENT TO
REPORT NO.
THIS IS UNEVALUATED INFORMATION
Radio, No 6, 1952, p 37-40.
AN ULTRASHORT-HAVE RADIO STATION FOR REMOTE RIIiS REPORTING
Yu. Mikhaylov (UA1BP)
Leningrad
This portable ultrashort-wave radio station, shown at the ninth all-ITnion
radio exhibition, is designed to transmit on-the-scene reports from stadiums,
squares, streets, buildings, and other places. It permits positive communica-
tion et distances up to one kilometer, which is sufficient for transmission to
a relay point equipped with an ultrashort-wave receiver. At this point, the
transmission can be recorded or relayed further to a radio broadcast station
by wire. Such a radio station releases the reporter from wire communications
and permits him greater freedom of movement.
This station can also be used during various competitions to transmit
commands and reports of judicial boards over various ranges, in the river fleet
for transmission of commands from a tugboat to a barge or float,,- and other places.
The radio station uses amplitude modulation on one fixed frequency in the
amateur ultrashort-wave band (85-87 Mc).
Power is supplied by two series-con-.cted NKN-10 nickel-alkaline storage
batteries with a drain of about 1.9 amp. The plate voltage of 120 is supplied
by a vibrator power pack. The battery will last for several hours of contin-
uous operation.
The antenna consists of a quarter-wave whip which is inserted into a socket
located in the top of the transmitter chassis during operation.
The radio weighs 4.6 kg with batteries.
- 1 -
FOR OFFICIAL USE ONLY
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 Sanitized Copy Approved for Release 2011/08/11: CIA-RDP80-00809A000700090516-8
The schematic diagram is shown in the appended figure. Two tubes are
used. Tube L1, and S0-257, is used as an electron-coupled rf oscillator. The
grid circuit L1C1 is tuned to about 43 Mc with trimmer capacitor Cl. Capaci-
tor C2 and resistor R1 provide negative bias on the control grid. The volt-
age is applied to the tube's screen grid through resistor R3.
Circuit L5C5C6 is connected in the plate circuit of L1. This circuit re-
move: he second harmonic generated in the screen circuit. The plate circuit
is tuned with trimmer capacitor C6. Capacitor C5 prevents short-circuiting of
the late battery if the plates of capacitor C6 touch. The use of frequency
doubling in the electron-coupled circuit provides adequate stability in the
transmitter's operating frequencies.
To increase the oscillator power, a positive potential is applied through
resis'or R2 to the suppressor grid of L1.
The antenna is inductively coupled to the oscillator's output circuit with
coil L3. C7 is a blocking capacitor.
Plate-screen modulation is used in the set. The required modulation index
is obtained through potentiometer R4, which control; the of voltage on the con-
trol grid of 12, an S0-241 modulator. If necessary, 2K2M or 2Zh2M tubes can
also be used in the modulator.
To eliminate background noise induced by the vibrator power pack, the tube
filaments and microphone supply circuit are connected to the battery through a
filter consisting of low-frequency choke coil Dr2 and electrolytic capacitor
C15. A filter consisting of chokes Dr3 and Dr4 and capacitors C9, CIO, and Cli
is used to suppress high-frequency interference developed in the primary of the
vibrator power pack.
Capacitors C12, C13, C14, C17, and C18 are used to eliminate sparking at
the vibrator contacts. A voltage-doubling circuit is used in the rectifier.
Components
Most of the set components are homemade. The grid circuit coil of oscil-
lator L1 is wound on a plastic or ceramic form 10 mm in diameter. It has nine
turns of P11 0.8 wire, and the winding is 14 mm long.
The tap for the cathode is made from the third turn, counting from the
coil's grounded side.
Coils L2 and L3 are spaced 4 mm apart on one ceramic form 20 mm in diame-
ter. Coil L2 has 3.5 turns of bare, silver-plated wire one millimeter in di-
ameter, and L3 has 1.5 turns of the same wire. The winding of L2 is 15 mm in
length.
A ceramic trimmer capacitor, Type KPK-1, is used as capacitor Cl. Trimmer
capacitor c6 with an air dielectric has a ceramic base.
The rf choke Drl is wound with PELShO 0.25 wire on a cylindrical form 10
mm in diameter. The winding consists of 30 turns and is 12 mm long.
All the components in the rf circuits must have low dielectric losses.
Microphone transformer Trl is assembled on a core 0.36 sq cm in cross
section. The primary winding has 150 turns of PEL 0.2 wire and the secondary,
1,500 turns of PEL 0.07 wire.
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STAT
The core of modulation transformer Tr2 is 1.0 sq cm in cross section. Both
windings have 4,500 turns of PEL 0.12 wire. The output transformer from an
RSI-4 receiver can also be -:d as a modulation transformer.
The specifications of power pack transformer Tr3 are as .ollovs: the core
cross section is 2.6 sq cm; winding I has 144* 144 turns of PEL 1.0 wire; and
winding II has 1,500 turns of PEL 0.3 wire. Varnished cambric is inserted be-
tween the layers of the primary winding. In the secondary winding, the var-
nished cambric can be placed between every two or three layers. Special atten-
tion must be given to the insulation between the primary and secc." ary windings.
Choke Dr2 is wound on a core 0.65 sq cm in cross section. It has two
windings of 75 turns each, both using PEL 0.59 double wire. The winding re-
sistance is such that with 2.4 v on the battery terminals, there are 2 v on
the tube filaments of the transmitter.
The core of choke Drs is the same as choke Dr2, but its winding has 4,000
turns of PEL 0.12 wire.
The rf chokes Dr3 and Dr4 are not wound on forms. They have 20 turns of
PEL 1.0 wire wound turn to turn. The winding diameter is 10 mm. The turns of
the coils are cemented by a solution of polystyrene in benzene for rigidity.
A vibrator designed to operate from 2.4 v is used in the transmitter. How-
ever, after a simple alteration, i.e., rewinding the vibrator coil, sy..chronous
vibrator power packs designed for other voltages can be used.
The transmitter uses a carbon microphone with a MK-l0MB button. Switch
Vkl can be of any type. The antenna socket is attached to a ceramic insulator
taken from a high-voltage capacitor.
The whip antenna consists of nine flexible steel strips of various lengths
10 mm wide and 0.15 mm thick. The longest strip (760 mm) is arranged in the
center, with the shorter strips on either side of it. The strips are riveted
together in 12-cm intervals. Washers are used where the rivets pass through
the strips. The tape from an old steel ruler can be used for the strips. The
antenna can be folded and occupies very little space when the transmitter is
moved.
STAT
appended figure follows.]
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Schematic Diagram
of the Transmitter
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