антенна на английском

Ответ от Михаил Гусев[эксперт]
As you know, the possibility of even the most committed and
expensive transceiver can not be implemented without the use of
high-performance antenna-feeder devices (AFD). To
Shortwave radio amateur-AFD - an important element of the amateur
radio. It is connected with the antenna
and the feeder line. The antenna, which is the initial part of this
tract, is used to convert the energy of high frequency currents
the energy of the electromagnetic field in the transmission, and vice versa - when
reception. Feeder is used for high-power transmission
oscillations from the transmitter to the antenna.
The antenna for radio amateurs - is the object of constant dreams,
worries and sorrows. On how to work effectively
AFD, depends largely on a range of telecommunications and,
consequently, achieve hams in his "hobby"
which many eventually develops into a kind of image
life or profession. The "hobby" everyone is looking for her - one
wins prizes in competitions at various levels (from
city ??before the World Cup), the other collects diplomas third
chasing DX (rare countries and territories) and the fourth
just loves to communicate with colleagues - such as hams,
including from other countries, thereby improving their
foreign language, etc.
Weak signals the most remote, and, consequently, the most
interesting stations can only be taken in full
using the receiver sensitivity, to the entrance of which
connected to a high-performance cable and antenna.
In all these cases, one of the determining factors
AFD is effective work. From the uninitiated in these matters
one can often hear comments like: "Why do you so much
outdoor antenna when I am on your receiver with a magnetic antenna
and so the whole world can hear! ".
Indeed, having a sensitive receiver, at room
or a built-in magnetic antenna can take a lot of
radio stations, including from other continents. But only
take because amateur radio antenna - a
especially the transmitting antenna. While on the other hand, high
successful safety will gain antenna and reception, allowing withdrawn
chit ratio of signal to noise and tune out
noise that come from other directions. The following applies
the principle of reciprocity - the parameters of antennas in both cases are the same.
Any antenna is reversible - equally it can be
It used for both transmission and reception, in both
cases, properties and parameters of antennas are the same.
Random piece of wire that is used as a transmission
the antenna is usually very low conversion efficiency
transmitter output power radiated in a desired direction
electromagnetic energy (10%). Good
constructed or (mostly) well-repeated
construction of amateur short-wave antenna can
have a gain greater than 10, so that the transition from
random special antenna to give an equivalent gain in
transmitter power hundreds of times.
Added (18-11-2009, 16:08)
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Unequal quality of receive and transmit antennas
It can be explained as follows. If you are using random
short antenna is located on a small
height from the ground, the potential signal Korres
respondents (and the accompanying interference!) will be equally weak.
But increasing the gain of the receiver having sufficient
Sensitivity can take much of the radio signals.
Amateur radio is mainly equipped with highly
antenna efficiency, so the signal transmitter operating
on inefficient antenna on the background of calling other stations
lost. No wonder there is a saying in radio: "The most
the best high frequency amplifier in the transceiver - a dish. "
In addition, the antenna efficiency can dramatically
make life easier for amateur radio neighbors, as it significantly
attenuates interference from shortwave radios
television reception.
Progress in electronics and microelectronics in th

Ответ от Катя Клевцова[новичек]
Просто найди на русском скопируй и вставь в переводчик и всё!!!

Ответ от 3 ответа[гуру]

Ответ от 3 ответа[гуру]