umbrella antenna造句
例句与造句
- Umbrella antennas with heights of 15 to 460 metres are in service.
- This type of antenna array is called a trideco or umbrella antenna.
- It is also possible to build an umbrella antenna with a grounded tower.
- Umbrella antennas can be built as single mast antennas or as multiple mast antennas.
- Umbrella antennas radiate omnidirectional radiation pattern.
- It's difficult to find umbrella antenna in a sentence. 用umbrella antenna造句挺难的
- Thus the umbrella antenna uses the guy wires as the top-load part of the antenna.
- The umbrella antenna was used for frequencies around 30 kHz, the ring antenna for frequencies around 20 kHz.
- Many smaller anchor blocks providing foundations for smaller towers that supported the umbrella antenna are still visible in the lagoons.
- They used grounded or insulated guyed masts with umbrella antennas, or wire-spans across both valleys and fjords.
- Two further masts of the station carrying an umbrella antenna are 471 metres tall and the tallest structures in India.
- The tallest umbrella antennas are actually used by Lualualei VLF transmitter, INS Kattabomman and the CHAYKA-transmitters at Inta and Dudinka.
- Chabrier Omega Transmitter ( station E ) near Chabrier on R閡nion at used an umbrella antenna, installed on a 428-metre grounded guyed mast.
- Umbrella antennas are in common use for commercial medium-wave AM broadcasting as well as for LF and VLF transmitters for broadcasting and navigational aids.
- Umbrella antennas were invented during the wireless telegraphy era, about 1900 to 1920, and used with spark-gap transmitters on longwave bands to transmit information by Morse code.
- Small umbrella antennas were widely used with portable transmitters by military signal corps during World War I, since there was no possibility of setting up full-sized quarter-wave antennas.
更多例句: 下一页