THE ARZ-51 AND ARZ-52 RECEIVERS

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000700090511-3
• Release Decision: RIPPUB
• Original Classification: R
• Document Page Count: 3
• Document Creation Date: December 22, 2016
• Document Release Date: August 11, 2011
• Sequence Number: 511
• Publication Date: December 5, 1952
• Content Type: REPORT

Sanitized Copy Approved for Release 2011/08/11: CIA-RDP80-00809A000700090511-3
SUBJECT Scientific - Electronics, receivers
REPORT
CD NO.
DATE OF
FOREIGN DOCUMENTS OR RADIO BROADCASTS
FOR OFFICIA
~~ G``~` {s
F N Rac".'Y,Z~li~
CENTRAL SINTTrLL GENCR E AGENCY
INFORMATION FROM
COUNTRY
HOW
PUBLISHED Monthly periodical
WHERE
DATE
PUBLISHED Jun 1952
LANGUAGE Russian
e. or . co,,.. nc, .. .. ..r ,. .ace ...,or
Radio, No 6, 1952, pp 19-20.
DATE DIST. S A i- 1952
SUPPLEMENT TO
REPORT NO,
THIS IS UNEVALUATED INFORMATION
THE ARZ-51 AND ARZ-52 RECEIVERS
V. Bezelyanskiy
Aleke,%ndrov
The ARZ-51 receiver is a modernization of the well-known ARZ-49. The
AFt-51 receiver (see appended figure) differs from its predecessor in many fea-
tures. A 6P65 (6v6) tube is used in the output stage in place of a 30P1M and
a 6Te5S (6X5) is used together with a power transformer in a full-wave rectifier
circuit to replace the half-wave selenium rectifier. Moreover the reflex, out-
put, and detector stages and the AVC circuit have been changed. The changes in
the detector and reflex stages and the increased plate voltage have considerably
improved the frequency response and cut down nonlinear distortion, especially
fr large signals.
The input circuit, the oscillator, and the i-f amplifier were not changed.
The features of the ARZ-51 are discussed below.
Rectifier
The voltage is fed to one rectifier plate from sections IA, IS, and IC of
the primary winding and to the other plate from the secondary winding of the power
transformer. The rectifier filament is supplied by a specially insulated winding
III which eliminates the possibility of sparkover between the cathode and heater.
Reflex Stage and Detector
The reflex stage has been simplified and its quality characteristics im-
proved. The sf voltage from the volume control which enters the detector load
passes through capacitor C28 and grid coil L7 of the first i-f filter directly to
the grid of the 6118S. Resistor R7 is the plate load for of currents. From this
point, the amplified of voltage passes through capacitor C20 to the control grid
of the output stage,
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Resistor R12, together with capacitor C21, form a filter which prevents self-
excitation of the reflex stage when the volume control is set for maximun output
or close to it.
The put stage I resistor istnot shuntedsbyfatcapacitor) . Compensationnofaback round not k (the bias
the auxiliary winding of the output transformer is not used inntthe ARZ-5leandtARZ-52. n
The electrical parameters of the ARZ-51 receiver are as follows: frequency
bands, 150-415 kc (722-2,000 m) and 520-1600 kc (187-576 m); the sensitivity is not
leas than200mv,tbeadjacent channel selectivity than 26 db (20-fold); the image channel attenuation ist15i 0 db (tenfold);, the out-
put power is 0.5 va, with a harmonic content of less than 5%; and the frequency re-
eponz is 150-3500 cps, with a variation of not more than 10-12 db (threefold). For
morenthan oltage
db(twohannlge of 26 db (20-fold), the output voltage does not change by
The power drawn from the ac line is not more than 35 w.
The ARZ-52 receiver has a more uniform frequency response because the tuned
circuit in the grid of the 6B8S is tuned to a somewhat higher frequency and the
tuned circuit in thn plate of the converter to a somewhat lower frequency than the
i-f tuned circuit in the plate of the 6B83, which is tuned to 112 kc.
The assembly of the ARZ-51azdARZ_.T receivers is the same as that of the ARZ_49. All
the cods have the same specifications as in the ARL-49 receiver (see Radio No 5,
6, 1949), except that coil L6 in the ARZ-52 receiver consists of three sections
having 290 turns each (in the ARZ~51 and ARZ-49, it has three sections of 265 turns
each); to reduce the circuit Q of L7C14, a steel ring KZ (shorting loop) is at-
tached to the coil form in the ARZ-52 receiver.
The output transformers of the ARZ-51 and ARZ-52 have cores of standard Sh-16
laminations with a stack thickness of 16 mm; winding I has 2,500 turns of PEL-1 Ql
wire and winding II has 61 turns of PEL-1 0.51 wire.
The power transformers of the ARZ-51 and ARZ-52 have cores of standard Sh-24
laminations with a stack thickness of 30 mm. Section IA of the first winding has
38 turns of PEL-1 0.8 wire; section IB has 655 turns of PEL-1 0.2 wire; sectira
IV, 355 turns of PEL-1 0.18 wire; anft section I0, 165 turns of PEL-1 0.18 wire.
Winding II has 1,130 turns of PEL_1 0.15wire and winding III has 37 turns of wire
PEL-1 0.51.
[Appended figure follows .7
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Schematic Diagram of the ARZ-51 and ARZ-52 Radio Receivers. The Switch Po-
sitions Indicated by the Solid Arrows Correspond to the Medium-Wave Band; Those
Indicated by the Broken Arrows Correspond to the Long-Wave Band. The Short-
Circuited Loop K2 Is Not Present in the 1RZ-51 Receiver.
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