Interchangeability of TV channel selectors. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Телевидение

 Comments on the article

When repairing video equipment, professional repairmen and radio amateurs sometimes need to replace the TV channel selector. You can choose a replacement according to the table of selectors of various foreign companies, which lists their main characteristics and possible replacements.

(click to enlarge)

Modern television channel selectors from leading manufacturers PHILIPS, TEM 1C, SIEL, etc. are not always on sale, and their cost is relatively high. At the same time, JSC "SELTEKA" (Kaunas), JSC "Minsk Instrument-Making Plant" ("Belvar", Minsk) produce universal models of high quality selectors, which can replace the models of the above-mentioned companies. The table published here contains some information about the models of selectors of leading manufacturers known (to the author), their complete analogues (replaceability of 100%), as well as other possible options for replacing the models of the listed AO with models are indicated. In addition, short descriptions of branded selectors can be used to determine their interchangeability. In the column of replacements, selectors are marked with one asterisk, which are not yet produced due to lack of orders, and two asterisks are obsolete models that have been discontinued.

Although the table does not contain the electrical parameters of the selectors, they are taken into account when selecting a complete analogue and a possible replacement. For such basic electrical characteristics as gain (it is in the range of 35 ... 42 dB with a frequency response unevenness of 2 to 5 dB) and noise figure (7 ... 9 dB for MV and 9 ... 11 dB for UHF), for different models of selectors, a large scatter is not observed. Therefore, when selecting analogues, they are not of decisive importance. As for other characteristics (IF selectivity, image selectivity, AGC adjustment depth and others), they, of course, differ significantly when comparing different models. However, often one selector model differs from another only in the television standard. The design characteristics of the selectors are no less important: the frame size, the pitch between the pins and their number, the design of the antenna socket and the type of IF output. These were the criteria for selecting analogues.

In the list of models of each company in the table, selectors with a supply voltage of 12 V are listed first (models of the company ALPS - 9 V), and then - 5 V.

The short descriptions list the main characteristics of the selectors in no particular order. In this case, the notation adopted for selectors [1] is used. The first method of tuning to a TV channel used in the selector model is presented: VST - with voltage synthesis; PLL - with frequency synthesis.

This is followed by a television standard (system), which ultimately determines the first IF of the image and sound signals at the output of the selector. For the Eastern European countries participating in OIRT (including Russia), the D and K standards are adopted, which are completely the same, only the D standard is used from the 1st to the 12th channels, and K is used for the Hyper Band and UHF bands. In Western European countries, the CCIR standard applies (systems B, G and H). More details about the standards and systems of television are described in [2].

The next characteristic of the selector is the type according to the received frequency band: cable, all-wave or only UHF.

Then the design of the antenna jack is characterized: phono - provides for the use of an adapter cable between the selector input and the "ANTENNA" jack of the TV; IEC (SNIR) - designed for direct connection of the antenna cable. With a socket length of 14.5 mm. additional information has been omitted for brevity. For longer nests, their length is indicated through a fractional line.

In last place is the characteristic of the output of the IF selector: sim. - symmetrical, asim. - asymmetric.

In some cases, in brackets is given the correspondence between the series (body size) of the selector and its analogue. For outdated models of selectors, such as UV617, UV618, UV815, UV816, МТХ4, selectors of the 60 series (KS-H-61, KS-Н-64) can only be called complete analogues, but they are discontinued [1, fig. 3 a, b]. In this case, a possible replacement would be the 90-series models, which have a shorter body, but the socket must be long.

According to the tables, it is possible to trace the designation system of selector models of some firms. So, for PHILIPS, it begins mainly with the letters UV, only some UHF blocks are designated with a single letter U. They are followed by three (or more) digits - the series and serial number of developments. Moreover, the first digits 6-9 are reserved for models with a supply voltage of 12 V, and 13 - for models with a supply voltage of 5 V. The serial number of the development in the last two digits characterizes the model type: even - PLL, odd - VST. However, some models may also contain the abbreviation PLL. The following are design features: РН/1 - PHONO or IEC antenna socket. For the latter with a length of 32,2 mm, the letter L is inserted. In the designation of selectors with a supply voltage of 5 V, the design features reflect the variant of the PLL protocol, symmetrical (S) or asymmetric (A) output, splitter (T) - distributor and other design (and circuit ) differences.

The designation of TEMlC selectors consists of four digits: a series (two digits) and a development serial number. Then there are letters. The first of them K denotes a voltage synthesis selector (VST), P is a frequency synthesis selector (PLL), U is a UHF VST selector. The second letter determines the received frequency band and the standard (system) of television: K - B / G system, H - B / G / H system (usually all-wave), Y - D / K system, E - decimeter system I. Differences in antenna input and IF output are not provided. For models with a supply voltage of 12 V, the last letter C is put, and for five-volt selectors - the number 5.

Deciphering of designations of selectors of JSC "SELTEKA" is considered in [1], but in connection with the development of new universal models it is necessary to supplement it. At the end, after specifying the standard (system), add the letters A - asymmetric IF output and P - PHONO antenna jack (balanced output and IEC jack are not indicated).

It should be noted that selectors with a supply voltage of 5 V, made according to the new world standard for unifying the design (11 pins with a pitch of 4 mm), have a high degree of interchangeability, which could be even higher if it were not for the difference in PLL control protocols.

The greatest difficulties arose in the selection of analogues and the possible replacement of PLL selectors, which are controlled by the original manufacturer's programs (recorded in the control processor), since there is no single standard.

The author thanks J. Mikolaitis and D. Liksienė, AS SELTEKA specialists for their help and kindly provided material.

Literature

1. Burkovsky A. Modern channel selectors. - Radio, 1999, No. 6, 7.
2. Zubarev Yu. B., Gloriozov G. L. Television equipment. Directory. - M .. Radio and communication, 1994.
3. Advertising and information materials of JSC "SELTEKA" for 2002

Author: A.Burkovsky, St. Petersburg

See other articles Section Телевидение.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Alcohol content of warm beer 07.05.2024

Beer, as one of the most common alcoholic drinks, has its own unique taste, which can change depending on the temperature of consumption. A new study by an international team of scientists has found that beer temperature has a significant impact on the perception of alcoholic taste. The study, led by materials scientist Lei Jiang, found that at different temperatures, ethanol and water molecules form different types of clusters, which affects the perception of alcoholic taste. At low temperatures, more pyramid-like clusters form, which reduces the pungency of the "ethanol" taste and makes the drink taste less alcoholic. On the contrary, as the temperature increases, the clusters become more chain-like, resulting in a more pronounced alcoholic taste. This explains why the taste of some alcoholic drinks, such as baijiu, can change depending on temperature. The data obtained opens up new prospects for beverage manufacturers, ... >>

Major risk factor for gambling addiction 07.05.2024

Computer games are becoming an increasingly popular form of entertainment among teenagers, but the associated risk of gaming addiction remains a significant problem. American scientists conducted a study to determine the main factors contributing to this addiction and offer recommendations for its prevention. Over the course of six years, 385 teenagers were followed to find out what factors may predispose them to gambling addiction. The results showed that 90% of study participants were not at risk of addiction, while 10% became gambling addicts. It turned out that the key factor in the onset of gambling addiction is a low level of prosocial behavior. Teenagers with a low level of prosocial behavior do not show interest in the help and support of others, which can lead to a loss of contact with the real world and a deepening dependence on virtual reality offered by computer games. Based on these results, scientists ... >>

Traffic noise delays the growth of chicks 06.05.2024

The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>

Random news from the Archive Visual stimuli amplify sound 20.02.2018 A new study has shown that visual stimuli (such as tracking a person's lips while talking) help the brain perceive sounds, amplifying them. Researchers at University College London (UCL) have found that visual information is related to auditory information on a more fundamental level than previously thought, independent of any conscious or attentional processes. When both of these types of information are perceived simultaneously, according to a press release on the NeuroscienceNews website, the auditory cortex - the region of the brain responsible for interpreting what is heard - can amplify sounds that somehow correlate with what the person is looking at. As lead author Dr Jennifer Bizley notes, although the auditory cortex is focused on processing sounds, almost a quarter of its neurons respond to light - this discovery was made ten years ago and until now scientists have tried to understand the reason for this structure of this brain. areas. In a 2015 study, Beasley and colleagues found that it's easier for people to distinguish between two sounds if they try to focus on what happens to the visual stimulus over time. In the new work, the experts presented the subjects with the same auditory and visual stimuli, while monitoring neural activity. It turned out that when one of the sound streams changed amplitude in parallel with changes in the visual stimulus, more neurons in the auditory cortex responded to this sound. “Looking at another person does not just make us hear better because we can recognize lip movements,” Beasley notes. “Our research has shown that this has an advantage at a lower, basic level, as the timing of movements and sounds tells auditory cortex, to which of the sounds to respond with greater force. According to the researchers, the results of the work can be useful in the development of special techniques for people with hearing impairment. In addition, it is expected that the study may also help developers of hearing or cochlear aids.

Other interesting news:

▪ Acer Predator X34 Gaming Monitor

▪ Keyboard disinfection

▪ Smartphone and breakfast with flame retardants

▪ The electronic patch will inform about the health of the patient

▪ pocket camcorder

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Encyclopedia of radio electronics and electrical engineering. Article selection

▪ article social science. Crib

▪ article What is geometry? Detailed answer

▪ Berek's article. Legends, cultivation, methods of application

▪ article Metal detector on the principle of Transmission-Reception. Encyclopedia of radio electronics and electrical engineering

▪ article Washing in hard and soft water. Chemical experience

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua
2000-2024