TV reception antennas and mounts

TV reception antennas and mounts - What is a Yagi antenna?

Reading time: 2 minute

Authors: M. Basoiu, N.Negut
Publisher: Tehnica - Cluj-Napoca
Year of publication: 1989

Did you know that ...? Is the Yagi-Uda antenna or Yagi one of the most famous antennas?

Despite its relatively simple construction, it has a scoop, usually higher than 10dB. Yagi-Uda antennas can operate in bands FIF and UIF (from 3MHz to 3GHz) the disadvantage being the large gain in a relatively narrow band. The concept of the Yagi-Uda antenna was invented in Japan by Shintaro Uda in 1926. The paper was first presented in English by Professor Yagi who, by moving to America, helped spread the concept.

What does the paper present?

The paper aims to present practical solutions for making installations or assemblies in RTV domain. All the montages described are experimented by the authors, the results being mentioned in the text. It thus meets the number of amateurs of electronic constructions, without a proper specialized training.

Supplement structure?

1. Radio frequency cables

1.1 Types of cables used in TV reception installations
The usual values ​​of the main parameters of the radio frequency cables
1.2 Connecting the radio frequency cables to the FIF and UIF circuits
1.3 Physical length of radio frequency cable sections

2. TV reception antennas in FIF and UIF ranges

2.1 Antenna Yagi
Yagi antenna dimensions with 3, 4, 5, 6, 7 and 22 elements
2.2 "Parabeam" antennas
Antenna element dimensions Parabeam with 7 elements for channels 1… 5 FIF OIRT
Antenna element dimensions Parabeam with 18 elements for channels 6… 12 FIF OIRT
Parabeam antenna element dimensions with 30 elements for the FIU range
2.3 Antenna systems
Four-phase antenna system
Connecting the group of phased antennas (parallel antennas, series-parallel antennas)

3. Antenna amplifiers

3.1 Antenna amplifier for a channel (group of channels) FIU made with low current transistors type BF272
3.2 UIF channel amplifier with MOS-FET transistor
3.3 UIF broadband amplifier
3.4 FIF broadband amplifier
3.5 FIF channel amplifier (band 3) with MOS-FET transistor
3.6 Broadband TV Amplifier (FIF-UIF)

4. Resistive distributors (adders)

5. Resistive attenuators

6. Recommendations for the realization of the TV reception installation

The structure of the TV reception installation depending on the image quality received by a portable TV receiver on its own telescopic antenna

7. Radio frequency transistors used in FIF and UIF TV ranges

8. Compatibility between different norms and television systems

8.1 Reception of OIRT TV shows with receivers made on other norms
Correspondence of TV channels FIF - OIRT with TV channels CCIR - B (FIF)
Correspondence of FIF - OIRT TV channels with FCC - FIF TV channels
8.2 Modifying the sound path of TV receivers according to different rules for receiving OIRT sound
Modification of the tuning capacity of the tuned circuits from the F1 sound stage for the reception of OIRT emissions (6.5 Mhz)

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12 comments

  1. "The first works on this antenna were published in 1926 by Japanese scientists Hidetsugu Yagi and Shintaro Uda. Although the name" Yagi "is today a well-known" technical terminus ", its use is an act of ingratitude to Shintaro Uda, the true inventor of the antenna "(Eberhard Spindler - Antennas ET Bucharest 1983).

  2. Gone are the days of antennas perched on roofs, on houses, or blocks of flats. Every time my fingers and hands froze, when I perched in the winter on the roofs of the blocks of flats to see the connections or to reorient the antennas ... And many found their solution…

  3. Yagi antennas built with iron elements for concrete reinforcement have allowed me to catch TV from Belgrade since 1986. Very good and gaining signal.

  4. Sebastian was right, but they were a bit heavy made of iron. We buy from the market a FIF one with three elements for channels 1-6; dipole, reflector and director and we had material for one of the upper channels!

  5. We fixed them on the lightning rods and spent a fortune on the coaxial cable 4-5 floors below. By the way, do today's young people still know how to make the adaptive loop at the correct length?

  6. Hard. Some theory is also needed! Tied to the cable - what else is being stolen at night! Sometimes with amplifier with everything.

  7. Once upon a time, how many did I not do? !! … Now they are gone! In my opinion, the length of the antennas at that time is inversely proportional to the reception power of a "sensor" of reception, to generalize, from today. I still have this brochure in the library!

  8. I think I have this brochure of about 4-5 pages maximum. It's very thin! I appreciate it from the picture! I got it from somewhere, I don't know exactly. But I know I have it. It was in the early '86s when I became very interested in electronics as a hobby! Since then we have been walking through the "Libraries" and looking for everything related to it! I ended up, at that time, not to brag, a Carpathian radio-TV in my village. Yes, we repair tube TVs, then hybrids, with tubes and transistors, then with integrated ones, from the ones with 2 ICs to the best color ones, with 5-6 ICs! I worked and documented myself with dozens of color TV sketches approx. 2 years.

  9. God, what a great antenna with 15 elements for Bulgarians I had on the block, it was good between 1976-1991! It was made after this book!

  10. The book was printed in 1988 or 1989. This was the second edition after "Long Distance TV Reception" probably by the same authors. The antenna diagrams were taken from the book "Antennas" by Eberhard Spindler!

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