Radioamator i Krótkofalowiec

Radioamator i Krótkofalowiec (Radio amateur and short-wave operator) 1972/10


Radio amateur and amateur radio operator of Poland, Year 22, October 1972, No. 10.

CONTENT.

  • FROM THE COUNTRY AND ABROAD.
    • Trade mission of the US radio industry in Poland (245)
    • XVII General Meeting of the International Scientific Radio Union (URSI) (245)
    • Radiotelephone in the range 450 - 470 MHz (245)
    • New measuring instruments from CSRS (245)
    • Consumer electronics at the Poznań International Fair (246)
  • TV.
    • General overview of the main components in color television receivers - Part I - Marek Tarnowski (249)
  • ELECTROACOUSTICS.
    • Stereo acoustic set "Ziphona S" - Vol. II and last - MSc. Jerzy Serafin (250)
    • Preamplifier for ZK 140 and ZK 145 tape recorders - Janusz Gajewicz (262)
  • AMATEUR RADIO COMMUNICATION.
    • Transistor receiver for fox hunting "FOX" - Ludwig Dzida - SP3CAR (253)
  • MEASUREMENT TECHNIQUE.
    • Pulse oscilloscope - Zbigniew Waluś (255)
  • DO YOU KNOW THAT... (263)
  • MISCELLANEOUS.
    • Practical workshop tips - Juliusz Kabarowski (264)
  • POLISH SHORT WAVE (265)
  • AMATORY RADIO IN LOK (268)

FROM THE COUNTRY AND ABROAD.

  • Trade mission of the US radio industry in Poland.
    On September 18-23, a special trade mission composed of presidents and directors of 12 of the most important US radio companies visited Warsaw to establish trade contacts and explore the possibility of supplying our market with products of such companies as RCA, COLLINS-RADIO, GENERAL DATA Comm, Industries, ITT, MAGNAVOX, GENERAL DYNAMICS Corporation.
  • XVII General Meeting of the International Scientific Radio Union (URSI).
    On September 21-29 this year, under the patronage of Prime Minister Piotr Jaroszewicz, the General Meeting of the International Union Radio Scientifique Internationale was held in Warsaw with the participation of over 600 scientists from 31 countries.
  • Radiotelephone in the range 450 - 470 MHz.
    The increasing demand for frequencies for various mobile services has forced manufacturers to move to the decimeter ranges.
    An example of a solution of this type of equipment is the PYE "Pocketfone" radio (Fig.).
  • New measuring instruments by CSRS.
    The Czechoslovakian company METRA-BLANSKO, known for its high-quality production of measuring instruments, has developed a series of modern measuring instruments for various service and laboratory applications. An example of such a solution is the PU 160 type instrument designed for measuring voltages and resistances with high input resistance (Fig.).


"Pocketfone" radiotelephone (left) and PU 160 type electronic device (right).

  • Consumer electronics at the Poznań International Fair.


Light meter and transistor receiver equipped with internal ferrite antenna and telescopic antenna.


Advanced multi-band radio receivers.

General overview of the main components in color television receivers - Part I.

Due to the differences in different designs of color television receivers, I limit myself here only to a general description of components used in receivers of European production.

The layout of the color television program receiver is much more complex than that of the black and white television receiver. A number of assemblies have increased tolerance, which affects a very complex technological process. In this article, intended for readers who know the issues of YOU black and white, only those components of color television receivers will be described, which differ significantly from those previously used in black and white television receivers.

Stereo acoustic set "ZIPHONA-S" - Part II and last.

Construction.

The acoustic amplifier and the "Ziphon" turntable are placed in a 400 x 300 x 100 mm housing made of plywood, which is then veneered. The sides of the casing (10 mm thick) together with the bottom wall (8 mm thick) constitute one unit, while the top plate for the turntable is made of 12 mm plywood and screwed to the casing with four wood screws. Cut the hole for mounting the "Ziphon" turntable according to the manufacturer's leaflet.

All functional blocks of the acoustic amplifier are attached to the housing of the device.

The preamplifier (both channels) was assembled on a printed circuit board (Fig. 5), the general view of which is shown in Fig. 6.


Fig. 5. Printed connections and arrangement of elements on the preamplifier board.

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