Radioamator (Radio Amateur) 1955/03


YEAR V, MARCH 1955, No. 3

  • YOUTH AS THE SOURCE OF RADIO-AMATEUR MOVEMENT (1)

    "Our whole society followed with great interest the course of the several-day deliberations at the recently convened 2nd Congress of the Polish Youth Union, which gathered in Warsaw hundreds of delegates from all over the country, outstanding activists of the young generation of People's Poland. The radio and the press devoted a lot of attention to this event, so close to us, and popularized it sufficiently. We listened intently to the speeches and statements made at the meeting, the words of criticism and words of appreciation for our self-sacrificing and ideologically tight Zetempo youth..."

  • BATTERY RECEIVER WITH 3 ELECTRON TUBES (2)

    "We provide a description of a 3-tube battery receiver adapted to work in the mid-wave (200 ÷ 570 m) and long-wave (730 ÷ 2000 m) range, characterized by high economy in electricity consumption. After turning off the loudspeaker lamp, the device allows reception on the headphones, and after completely turning off the battery and inserting the crystal, it can be used as a detector receiver..."


Schematic diagram of the receiver

Placing the essential parts on the chassis

  • THE ESSENCE OF ELECTROMAGNETIC WAVES (6)

    "Space, one form of the material world, has a strange quality. Namely, a body placed in space may be subjected to a specific mechanical force, although no other body is in its immediate vicinity..."

  • HOW I BECAME THE POLISH REPRESENTATIVE? (9)

    "A. SUCHETA SP9-107. I encountered telegraph for the first time at the Provincial Communications Club of the League of Friends of Soldiers in Krakow in February 1953. I noticed that learning the Morsa signs was very good and fast, which encouraged me to work on increasing the speed of reception. It coincided with the first listening sessions that I began to carry out from the moment when I was already able to distinguish individual letters and numbers broadcast by amateur stations, of course the slowest ones. I carried out a lot of listening in a short time, and these mainly contributed to my further success, that is, to receive stations transmitting at up to 100 characters per minute...
    "
  • DESIGNING A DIRECTIONAL VHF ANTENNA - completion (10)

    "The last stage of antenna design includes the antenna feed line, the so-called "Feeder". For the correct design of this line, it is necessary to know the antenna radiation resistance. In the case of a single dipole, i.e. a half-wave element, placed in free space, the radiation resistance related to the antenna center, i.e. the head of the current, is 73.2 Ω..."

  • VHF transmitter 420 ÷ 460 MHz (13)

    "In September 1954, trials of amateur shortwave communication took place, in which the SP5KAB station set up on Śnieżnik in the Kłodzko Mountains participated. These tests, organized by the Czechoslovakian SVAZARM, were carried out on the 420 and 1215 MHz bands. One of the transmitters working there - due to its simplicity and the results achieved - deserves special attention. Here is its description..."

  • ON AMATEUR BANDS (15)

    "In the period from mid-January to mid-February, there was a certain further increase in the activity of Polish stations in the air..."

  • "REMBRANDT" TYPE FE 852 B TV RECEIVER (15)

    "The "Rembrandt" television set, produced by the Sachsenwerk plant in the GDR, is one of the latest achievements of the GDR television technology and, thanks to its relatively low price, makes it possible to popularize television among the general public. This television with a screen with dimensions of 180 x 240 mm on a picture lamp type HF2963 is designed to receive the Berlin and Leipzig broadcasting stations, and also provides the reception of ultra-short stations in the VHF band with frequency modulation..."

  • BEFORE THE "POLNI DEN" COMPETITION - SP5FM (19)

    "The results of the ultra-shortwave competition "Polni Den 1954" were announced in the January issue of AMATERSKE RADIO. 124 radio teams out of 137 entered took part in them. A total of 1,189 operators, including 87 women, participated in the competition..."

  • "STERN" 7E86ARECEIVER (20)

    "Among the new receivers, imported and recently distributed on the market, the receiver produced by the GDR Stern 7E86A deserves attention. It is characterized by a modern construction, good acoustics and effective workmanship. Built in a 7-tube superheterodyne system, it allows the reception of waves with amplitude modulation (AM) and frequency modulation (FM system)..."

  • PRINCIPLE OPERATION OF RADIOLOCATION DEVICES (RADAR) (22)

    "The radar devices described here have little to do with television, although there is an analogy between them.
    Admittedly, both in television and in radiolocation we use electromagnetic waves as a form of energy transmitted over a distance and an oscillographic lamp necessary to create an image, but this is also where their similarity ends. The difference itself is very fundamental. There is an image on a television screen when it is sent by any television station; in the radar device, the image is formed independently of any external transmitting station, since the transmitter and receiver are in the same device..."

  • CHARACTERISTICS OF ELECTRON TUBES (25)

    "Following the wishes of our readers, we present the characteristics of the most frequently used vacuum tubes, we present the data of the power amplifier tubes. These data will be continued in the following numbers. We are one of the first to present the characteristics of 6V6 and 6L6 tubes..."

  • FROM RADIO AMATEURS PRACTICE (27)

    "It is known that the apparatus of both wireless and wired radio, as well as some additional devices (e.g. loudspeakers powered from the radio network), measuring and control devices, etc., are very sensitive to harmful influences, which - apart from improper operation and include: shocks, moisture, rapid temperature changes, contamination with dust or swarf, and corrosive fumes..."

  • RULES OF THE 2nd NATIONAL QRP COMPETITION (28)
  • SP COMPETITION (28)
  • HUNGARIAN ACHIEVEMENTS OF RADIOTECHNICS (29)

    "Radio technology is one of the oldest industries in Hungary. Already in the first years of the 20th century, the production of light bulbs was started, and in the 1920s - the production of radio sets. However, the assembly industry grew so rapidly that domestic production of component parts could not keep pace with it, and therefore most of the basic construction elements had to be imported from abroad..."

  • PUBLISHING OVERVIEW (30)
  • TIPS (30)
  • EXCHANGE (31)
  • NOMOGRAM: RESISTANCE, VOLTAGE, CURRENT, POWER (32)

PDF : Radioamator 1955/03 v1

 The whole list

Elaboration: Grzegorz Makarewicz (gsmok)