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TV antennas.

Indoor television antennas work in conditions drastically different from the operating conditions of the external antenna.

It is caused by the structure of the electromagnetic field VHF indoors. There is a field typically has a clear interference in nature, being a field of standing waves, which can be explained by the presence of reflections from the walls and various objects in the room. The intensity of the electromagnetic field in a room can dramatically change when you move to 1-1.5 m. For the various frequency components of a television signal distribution spehtra maxima and minima of the electromagnetic field may

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Fixed antenna-feeder devices

On the stationary transmitting radio centers to ensure close communications (1,000 km) non-directional and omnidirectional used the range dipole antenna type UGD (angled horizontal range), IOP, VGDSH, VGDSHP and VGPSH (planar). For the organization of long-distance communications are used directional antenna radiation — rhombic (WG), double rhombic (RGD), horizontal in-phase (SGDRA) and the log-periodic (LPA).

When working at a distance of 1,000 km using 3-4 UGD antenna size and antenna size 2-3 IOP VGDSHP and VGPSH. The average values ​​of gain (CG) and directional (CPV) antenna near-field communication, taking into account the real parameters of the land are in the

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Improving WORK PONAB-W

VS Titarenko, art. Electrician distance Lozovsky South Road

Mirror survey of railway track

According to the technological process of service PONAB-3 when checking the parameters in the sentry boxes of equipment machinery is switched off. At this time, the passing trains are not controlled by heating Books.

In order not to turn off the equipment during the test, the outside of the windows I installed the mirror survey of railway track. I installed at an angle so that the measurement of parameters in blocks through a mirror you can inspect the railway line from the approaching train sitting at the

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HOME. LETS RUMBLE.

Bass shakers are like the rumble packs in a Playstation or Xbox game controller. They make whatever they’re attached to rumble when they get a signal from the LFE (low frequency effects) channel of your audio system. That means when the T-Rex puts its foot down in Jurassic Park, you don’t just hear it… you feel it.

You can buy an $800 shaker system from a commercial outfit like Buttkicker or Clark, or you can put the components together yourself for as little as $30. I’ve done it both ways, and I like the $30 results better. That cost assumes

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To develop ultrashort sport.

Work on the amateur radio ultrashort waves, since the summer of 1955, has become much livelier. In the air there and began work on a regular basis, but with a long delay, the radio station of the Central Radio Club DOSAAF — UAZKBG; during the summer actively conducted communication ukavisty Moscow region: 064,004 (of Babushkin, the operator Korshunov), 064,010 (Reutov, Shish operator). Daily were also broadcast radio UAZAR (Dmitrov village) and 077,516 (village Usovo). Often you could hear the work stations 077 510 (operated by soldiers), 077 509 (operator Gorodetsky) and 064,002 (operator Nekrasov). But the revival that has occurred

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Future Focused

Lifting the lid on next-gen avionics research

Whether it is highly integrated antennas that reduce drag, certifiable data links for unmanned aircraft or simulation tools for Next Gen airspace research, it is not often that a major manufacturer takes the wraps off its internal R&D.

But Aviation Week was given a glimpse inside Rockwell Collins’ Advanced Technology Center (АТС)— and a look into the avionics company’s future—during a visit to Cedar Rapids, Iowa.

John Borghese, vice president for the АТС, says 70% of the research organization’s funding is aligned with the company’s business units and 30% is directed toward long-term

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Amateur radio in 2013

Ham antennas

End. Beginning at №7 / 2013

The book «Antennas» K. Rothammelya in its several editions — it is a huge and important part of amateur radio education and self-education of the 1970s-1980s. The book is full of direct errors, inaccuracies and exaggeration, but it is impossible to downplay its concrete benefits for the vast mass of amateur radio operators. However, nothing stands still, and now there are books of another professional level, and other tools, which previously could not even dream for the simple reason that they did not exist. It is a computer simulation of antennas.

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FUTURE WITHOUT AFAR IMPOSSIBLE — EUROFIGHTER

Participants in the consortium Eurofighter Typhoon fighter producing England, Germany, Italy and Spain will not be able to get export orders in the future if you do not agree to finance the development of airborne radar with active electronically scanned array (AESA), June 5 aviationweek.com reports citing a statement by the Senior Vice president of Selex (comes in group Finmeccanica) Chris Bushell (Chris Bushell).   Potential clients «Typhoon», such as the United Arab Emirates (UAE), claimed that these fighters were equipped with radar AFAR, and not with ordinary mechanical scanning. In 2011, the countries of the consortium agreed in principle

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French Air Force Rafale fighter armed first AFAR

Defense procurement agency (DGA) French Ministry of Defense received the first Rafale fighter drill mounted on it with radar with active phased array antenna. According to the agency, a military aircraft was delivered September 12, 2013. Double combat aircraft with tail number «B339» lately will be given RAF France in Mont-de-Marsan in the southwest of the country. Delivery of the first experimental fighter with radar AFAR Air France first accomplished in October 2012. New radar was equipped with a single plane with tail number «C137». Then it was reported that the new combat aircraft became the first production Eurofighter, received

Continue reading French Air Force Rafale fighter armed first AFAR

French Air Force Rafale fighter armed first AFAR

Defense procurement agency (DGA) French Ministry of Defense received the first Rafale fighter drill mounted on it with radar with active phased array antenna. According to the agency, a military aircraft was delivered September 12, 2013. Double combat aircraft with tail number «B339» lately will be given RAF France in Mont-de-Marsan in the southwest of the country. Delivery of the first experimental fighter with radar AFAR Air France first accomplished in October 2012. New radar was equipped with a single plane with tail number «C137». Then it was reported that the new combat aircraft became the first production Eurofighter, received

Continue reading French Air Force Rafale fighter armed first AFAR

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