No announcement yet.

HF77DIORA - Dobrzyca - Poland

  • Filter
  • Time
  • Show
Clear All
new posts

    HF77DIORA - Dobrzyca - Poland

    Radio Amateurs members of the Dobrzycki Klub Krotkofalowcow, SP3PDO will be active with special call HF77DIORA from Dobrzyca, Poland.
    They will operate on HF Bands.
    QSL via SP3PDO.
    Information from their QRZ page:
    The factory started operating on November 8, 1945 under the name of the State Radio Receivers Factory (PFOR) in Dzierżoniów. The next names of the factory are DZWUR, or Dolnośląskie Zakłady Wytwórcze Urządzeń Radiowych, T-6, and finally Diora. The commissioning of the plant and the organization of the production of the first receivers was managed by Wilhelm Rotkiewicz. Initially, simple reaction receivers from former German components were assembled. One of the stages of the production process was "scraping the gap", that is, removing the German emblem with the swastika from the casing. The TONSIL company had similar beginnings.

    In 1947, a license for the production of the Aga superheterodyne radio receiver was purchased from the Swedish company AGA and its production began. At the same time, Wilhelm Rotkiewicz's team was working on the construction of its own radio receiver, cheap and available to the mass user. In 1948, the first Polish radio receiver was created - Pionier, in various variants produced in the number of over a million copies. The construction of Pionier survived under the name Promyk until 1968. In addition to radio sets, Diora produced radio stations for the army at the turn of the 1950s and 1960s, as well as television sets (including Aladdin, Tosca, Scheherezada), and in the mid-1990s, VCRs.

    In the 1970s and 1980s, the Diora company belonged to the Union of the Electronics Industry UNITRA.

    In total, several dozen models of radio receivers have been developed and implemented for production, the following of which are worth mentioning:

    • 1950 - Pionier B2 - The first battery-powered receiver after the war;

    • 1952 - Mazur - Receiver with Pionier U circuit with the use of a mains transformer and "E" series lamps;

    • 1955 - Polonez - The first Polish post-war design of a receiver with a turntable;

    • 1956 - Silesia - The first in which the rotary range selector was replaced with a key switch and the VHF range was added (on the super reaction pickup);

    • 1957 - Nocturne and Sonatina - Universal receivers with the Pionier U circuit with a keyboard range selector;

    • 1959 - Calypso - Receiver equipped with full FM track;

    • 1960 - Kos 6290 - In this model, the classic assembly on a metal skeleton (chassis) was abandoned and the technology of assembly on a printed circuit board was introduced;

    • 1965 - Krokus 10501 - The first portable Dior receiver built on transistors, additionally with the possibility of mounting in a car;

    • 1970 - DSL-201 - The first Polish hi-fi class stereo receiver, made on tubes. An innovative solution was the stereodecoder system.

    • 1972 - Meluzyna - The first Polish Hi-Fi class transistor radio, built on 43 transistors. Stereo tuner and amplifier in separate boxes; The development was the implementation of the so-called "Third case" of the quadraphonic version of Meluszyn. The "third box" contained a quadraphonic decoder and two additional amplifiers for the 3rd and 4th channel.

    • 1973 - Elizabeth - a modern receiver developed in cooperation with the Japanese company Tokyo-Sanyo Electric Co. Ltd. It was the first time that such modern components as integrated circuits, thick-film circuits, LED diodes, ceramic filters were used in it;

    • 1975 - Harpsichord - The last tube receiver from Diora;

    • 1976 - Amator-Stereo DSS-101 - for many years was the most popular standard stereo radio. It was produced in changed versions until 1985.

    At the end of the seventies and eighties, the so-called tower sets, consisting of separate segments: radio receiver (tuner), amplifier, cassette recorder and graphic equalizer, and later also a CD player. Over a period of time, a whole range of towers was produced, starting with the smallest (mini), which was the tower consisting of the WS 315 amplifier, the AS 215 tuner, the FS 015 graphic equalizer and the MDS 415 tape recorder; via midi sets, e.g. WS 354 amplifier, AS 252 tuner and MDS 456 tape recorder; for the largest sets, the so-called large towers, e.g. SSL 500 (SSL - Semi Slim Line) (one of the last towers produced by Diora (from 1991 to the end of the 90s)) or SSL 700 (the last tower set implemented into serial production, one of the best products at that time in Europe, confirmed by repeated victories in tests of foreign magazines, in production since 1993/1994)

    An important aspect of the existence of the plants was production for export. Diora produced devices for such respected companies as Thomson or Brandt, but also produced under the lesser-known brands like MacWatts, Geton, Crown Japan, etc. The export versions differed significantly from the domestic versions, foreign components were used, e.g. ALPS tape heads and often innovative solutions.

    In 1989 Przedsiębiorstwo Państwowe Zakłady Radiowe Diora was transformed into a joint stock company Diora S.A.

    At the end of the 1980s, microprocessor technology was used in the manufactured equipment (500 series towers, receivers with frequency synthesis, remote control). The nineties also saw the production of VHS VCRs (MVD-101, MVD-200), satellite TV tuners (TSA-502, TSA-504, TSA-506) and TV receivers (OTVC-100, OTVC-200).

    In 2006, Diora was legally removed from the register of entrepreneurs. In the same year, the buildings belonging to Diora were demolished, which finally ended the history of Diora. A Kaufland supermarket was built on the site. To commemorate the fact that this place used to be Diora, the street where the shop is located was called "Diorowska", and a tiny sign was installed next to the old concierge with the information that Diora was here.

    Currently, there is a Diora branch in Świdnica (Diora-Świdnica), producing loudspeakers based on Tonsil and Tesla drivers.

    HF77DIORA Dobrzyca, Poland
    73 Al 4L5A