RADIO dla Techników i Amatorów, Rok I, Sierpień 1946r., Nr 6.
(RADIO for Technicians and Amateurs, Year I, August 1946, No. 6.)
- Ultrashort waves (1)
In the era of radio engineering development we are experiencing, the first place in radio communication is occupied by devices for long, medium and short waves. However, the advancement of the ultrashort wave technique requires that we use this new range as widely as possible.
During the war, ultra-short waves gave the militant parties such a combat tool as radiolocation, which allowed them to detect aircraft and enemy ships from a considerable distance and fire at them despite their invisibility.
- Review of issues in the construction of radio receivers (completion) (6)
In terms of power supply, we distinguish between battery-powered radio receivers and radio receivers powered from the lighting network (network radio receivers).
Radio receivers are usually powered from AC or DC mains, and exceptionally from batteries. Until recently, the DC electric network and the AC electric network required other types of vacuum tubes. Currently, there are universal vacuum tubes (for direct and alternating current).
- Thyratrons and their application in radio engineering (continued) (9)
- 20 Watt Audio Amplifier (13)
At the request of our readers, we provide a schematic and assembly diagram with a description of the low-frequency power amplifier. This amplifier may be used to drive two 10 watt speakers or more lower power speakers. For the amplifier to work properly and without distortions, the sum of the power consumed by these speakers must not exceed 20W. This amplifier, thanks to various possibilities, is used for the sound of squares, slides, stands, railway stations, gardens, etc.
- Advances in radio navigation (continued) (19)
The "Loran" system.
The name of the system "Loran" is made up of the three words "LOng RAnge Navigation" which denote long-distance shipping. Thanks to this system, the navigator easily determines the exact position of its aircraft or ship, practically regardless of the distance from the transmitting station.
- American electron tubes (22)
- Diagram overview (23)
In the current issue we present a diagram of the newest European radio receiver and two popular American radio receivers.
- Scheme number 15: Minerva 424GW for direct and alternating current,
- Diagram number 16: American 3-band receiver
- Scheme 17: a newer version of the American radio.
- Low frequency transformers and chokes (final completion) (26)
- Editor's Replies (30)
- Nomogram Number 5 (32)
- Parallel connection of resistors (inductances) or series connection of capacitances