helical antenna वाक्य
उदाहरण वाक्य
मोबाइल
- In most cases, helical antennas are mounted over a ground plane.
- The prominent helical antenna received telecommands from a ground station.
- Helical antennas can operate in one of two principal modes normal mode or axial mode.
- A common form of normal-mode helical antenna is the " rubber ducky antenna " used in portable radios.
- A "'helical antenna "'is an antenna consisting of a conducting wire wound in the form of a helix.
- One application that has used heatshrink in large quantities since the early 1970s is the covering of fibreglass helical antennas, used extensively for 27 MHz CB Radio.
- In the " axial mode " or " end-fire " helical antenna, the dimensions of the helix are comparable to a wavelength.
- In radio transmission, circular spacecraft communications, or where the polarisation of the signal may change, so end-fire helical antennas are frequently used for these applications.
- For television broadcasting specialized vertical radiators that are mostly modifications of the slot antenna or helical antenna are used : the slotted cylinder, zig-zag, and panel antennas.
- There are many ways to make a high-gain antenna-the most common are parabolic antennas, helical antennas, yagi antennas, and phased arrays of smaller antennas of any kind.
- In the " normal mode " or " broadside " helical antenna, the dimensions of the helix ( the diameter and the linearly polarised parallel to the helix axis.
- Lunokhod 1 was equipped with a cone-shaped antenna, a highly directional helical antenna, four television cameras, and special extendable devices to impact the lunar soil for density measurements and mechanical property tests.
- In an axial-mode helical antenna the direction of twist of the helix determines the polarisation of the radio waves : a left-handed helix radiates gain when receiving right-circularly-polarised signals, and vice versa.
- In order to receive HRPT transmissions a high gain antenna is required, such as a small satellite dish, a helical antenna, or a dish tracking controller are required to steer the Azimuth-Elevation unit controlling the parabolic dish.
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