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3 XHCTTI-TDT: Tijuana: Imagen Televisión (Excélsior TV) 132.148 kW [4] Cadena Tres I, S.A. de C.V. 23 6 XETV-TDT: Tijuana: Canal 5 (16.1 Nu9ve) 200 kW Radio Televisión 15 11 XHCPDE-TDT: Tijuana: Canal Once (Once Niñas y Niños) 78.96 kW Instituto Politécnico Nacional 32 12 XEWT-TDT: Tijuana: Televisa Regional 200 kW Televisora de Occidente ...
A e = (λ 2 G)/4π : the antenna effective aperture; P D is the power density in watts per unit area; P r is the power delivered into the load resistance presented by the receiver (normally 50 ohms) G: the antenna gain; is the magnetic constant; is the electric constant
[3] [10] They are sometimes classed together with dipoles in the broader category of linear antennas, or more plainly straight wire antennas, [citation needed] since their radiating section is normally a straight (linear) wire or tubing; rarely, both dipoles and monopoles are called electric antennas, [citation needed] since they interact with ...
Particularly with a transmitting antenna, the antenna feed is a critical component that must be adjusted to function compatibly with the antenna and transmitter. [3] The transmitter output terminals, the transmission line , and the antenna each has a specific characteristic impedance , which is the ratio of voltage to current at the terminals ...
The log-periodic is commonly used as a transmitting antenna in high power shortwave broadcasting [15] stations because its broad bandwidth allows a single antenna to transmit on frequencies in multiple bands. The log-periodic zig-zag design with up to 16 sections has been used.
The construction of the VLBA began in February 1986 and it was completed in May 1993. The first astrometrical observation using all ten antennas was carried out on May 29, 1993. [3] The total cost of building the VLBA was about $85 million. The array is funded by the National Science Foundation, and costs about $10 million a year to operate. [4]
A transmitting antenna is supplied with power by a transmission line connecting the antenna to a radio transmitter. The power accepted by the antenna is the power supplied to the antenna's terminals. Losses prior to the antenna terminals are accounted for by separate impedance mismatch factors which are therefore not included in the calculation ...
Counterpoises are typically used in antenna systems for radio transmitters where a good earth ground connection cannot be constructed.. Monopole antennas used at low frequencies, below 3 MHz, such as the mast radiator antennas used for AM broadcasting, require the radio transmitter to be electrically connected to the Earth under the antenna; this is called a ground (or earth).
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