Radio dla Techników i Amatorów (Radio for Technicians and Amateurs) 1946/04

RADIO dla Techników i Amatorów, Rok I, Kwiecień 1946r., Nr 2.
(RADIO for Technicians and Amateurs, Year I, April 1946, No. 2)

  • Overview of issues in the construction of radio receivers (continued) (1)
       Radio receivers without frequency conversion (so-called direct) are classified according to the number of tuned circuits, which also includes the tuned circuits of the ribbon filters.
    • Signal reception strength and gain control.
    • Adjusting the web width in the process of receiving the signal.
  • The range of reception of radio broadcasting stations (5)
       The reception range of a broadcasting station depends on many factors. We will consider here the obstacles that, regardless of the power of the station, limit the certain reception of the station during the day and night.
  • Low frequency transformers and chokes (8)
       In every receiver, in every amplifier, a transformer and a choke are a necessary element, the design of which depends on the essential properties of the device.
    • Electrical calculation of transformers and chokes.
    • Transformation relationship for different frequencies.
    • Transformatory wyjściowe.
    • Chokes.
  • Universal measuring instrument (14)
       With today's lack of parts, the radio technician is usually limited to repairing receivers and rarely starts building a new receiver on its own.
       When selecting the topics, we took this circumstance into account and that is why, in the first place, we provide descriptions of devices that will put the work of radio technicians at the appropriate level.
  • Microphones (17)
      Depending on the physical principles of operation, we distinguish the following types of microphones: carbon microphones, electrodynamic microphones, condenser microphones, electromagnetic microphones, ion microphones, piezoelectric microphones.
  • Technical box responses (20)
  • Overview of schematic diagrams (21)
      In the current issue we present four receiver systems manufactured in recent years.
    • Scheme number 5: radio "Minerva 415B".
    • Scheme number 6: "Hornyphon 136A" radio.
    • Scheme number 7: military type receiver made by Blaupunkt and Philips - Valvo.
    • Scheme number 8: radio receiver "Olimpia 396 WSK".
  • American electron tubes (26)
      The variety of types, the difficulty of knowing the purpose of the tube according to digital markings, prompted American manufacturers to introduce a standard in the markings of radio tubes.
    • Examples of determining electron tubes.
    • Sockets for electron tubes.
  • Nomogram number 2 (32)
      Calculation of windings (number of turns - volume - winding length).

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