AN ULTRASHORT-WAVE RADIO STATION FOR REMOTE NEWS REPORTING

Document Type: 
Collection: 
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
Case Number: 
Publication Date: 
December 8, 1952
Content Type: 
REPORT
File: 
AttachmentSize
PDF icon CIA-RDP80-00809A000700090516-8.pdf166.84 KB
Body: 
Sanitized Copy Approved for Release 2011/08/11: CIA-RDP80-00809A000700090516-8 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 Sanitized Copy Approved for Release 2011/08/11: CIA-RDP80-00809A000700090516-8 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. Sanitized Copy Approved for Release 2011/08/11: CIA-RDP80-00809A000700090516-8 Sanitized Copy Approved for Release 2011/08/11: CIA-RDP80-00809A000700090516-8 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.] Sanitized Copy Approved for Release 2011/08/11: CIA-RDP80-00809A000700090516-8 Sanitized Copy Approved for Release 2011/08/11: CIA-RDP80-00809A000700090516-8 Schematic Diagram of the Transmitter Sanitized Copy Approved for Release 2011/08/11: CIA-RDP80-00809A000700090516-8