directional aerial การใช้

• The installation of directional aerials also encouraged more AM stations.
• It was part of the directional aerial for the AFN transmitter described above.
• Directional aerials consist of multiple masts, which need not to be of the same height.
• The Meacon system involved separate locations for a receiver with a directional aerial and a transmitter.
• Unusually, this transmitter also transmits neighbouring services Radio Sheffield from separate directional aerials on the mast.
• The longwave transmitter uses a directional aerial with a maximum strength pointing northwest ( azimuth : 309?).
• The directional aerial for 1296 kHz ( erected in 1978 ) consisted of six freestanding steel lattice towers.
• It uses a directional aerial, consisting of a high and a high guyed grounded mast 330 metres apart.
• Unlike the directional aerial for 648 kHz, they were arranged in two parallel rows with three towers in each.
• However, in North Essex, Capital was out of range except for people with a very expensive directional aerial.
• From 1963 until its demolition in November 1993, the mast was used as part of a directional aerial for a mediumwave transmitter.
• A directional aerial array was used to avoid wasting power over the English Channel and to enhance the signal to the east and west.
• It is also possible to realize directional aerials for mediumwave with cage aerials where some parts of the cage are fed with a certain phase difference.
• Cellular wireless networks generally have good capacity, due to their use of directional aerials, and their ability to reuse radio channels in non-adjacent cells.
• It used a directional aerial consisting of four 125.1 metre ( 407 feet ) high guyed steeltube framework masts insulated against ground with triangular cross section.
• Initially broadcasting on 837 kHz, 3CR now broadcasts on 855 kHz at 2 kW into a directional aerial, from a site at Hoppers Crossing about 15 km west of Melbourne.
• The directional aerial for 648 kHz ( erected in 1981-82 ) consisted of a row of five 106.7 metre ( 350 ft ) freestanding steel lattice skywave propagation.
• It worked simply with a crossed pair of conventional and fixed directional aerials, the oscilloscope display showing the relative received strength from each aerial as an elongated ellipse showing the line relative to the ship.
• This type of radiation was not possible with the aerial on the wood framework tower and a directional aerial consisting of two insulated guyed radio masts with a height of 94 metres had to be built.
• In its time on the AM band, the station had its power increased twice, first to 2, 000 watts, and then to 5, 000 watts, using a directional aerial system.