vertical antenna การใช้

• The vertical antenna was twenty feet high and five feet wide.
• It looks like a podium with a horizontal loop and a vertical antenna.
• Instead of triangulation, a second dipole or vertical antenna can be electrically combined with a loop or a loopstick antenna.
• Included with the radios on board the ship are two Sunair RT-9000 HF transceivers with matching antenna couplers and vertical antennas.
• For non directional portable use, a short vertical antenna or small small loop antennas are tuned with parallel capacitors for this purpose.
• The Naval Air Development Center developed the required technique of " stalling " the trailing antenna to achieve the long vertical antenna needed.
• Vertical antenna which may be of any desired height : less than about one-half wavelength of the frequency at which the antenna operates.
• In 1947 WGBB s long wire antenna, strung between utility poles in Carman s backyard was replaced by a gleaming self-supporting 285 foot vertical antenna.
• It is for this reason that medium wave broadcast stations use vertical antennas, even if they have to be made physically short by adding inductive loading.
• In low-frequency applications involving loaded or nonloaded vertical antennas, the effective height is the moment of the current distribution in the vertical section, divided by the input current.
• The HF Adcock stations consisted of four 10m vertical antennas surrounding a small wooden operators hut containing a receiver and a radio-goniometer which was adjusted to obtain the bearing.
• This modification added a set of vertical antennas and a new elevation-measuring CRT to read them, along with a radiogoniometer that allowed the vertical angle to be accurately measured.
• Antennas based on the dipole ( rather than vertical antennas ) should include a balun in between the transmission line and antenna element, which may be integrated into any such matching network.
• One example of omnidirectional antennas is the very common " vertical antenna " or whip antenna consisting of a metal rod ( often, but not always, a quarter of a wavelength long ).
• The sound of the theremin is controlled by moving one's hands close to two antennas set into the box : The vertical antenna controls the pitch, while a horizontal loop antenna affects the volume.
• Although less sensitive directly forward, both vertical antennas could see directly in front of the fighter, so a target located dead ahead caused two slightly shorter blips, one on either side of the centreline.
• The "'Low " R ", high " C " "'circuit is shown feeding a short vertical antenna, such as would be the case for a compact, mobile antenna or otherwise on frequencies below an antenna's lowest natural resonant frequency.
• The power radiated ( or received ) by an electrically short vertical antenna like the T is proportional to the square of the " effective height " of the antenna, so the antenna should be made as high as possible.
• A vertical antenna being less visible than a mechanically tilted one, the use of purely electrical tilt with no mechanical tilt is an attractive choice for aesthetic reasons which are very important for operators seeking acceptance of integrated antennas in visible locations.
• A sense antenna normally consists of a single vertical antenna positioned some distance from the crossed loops, in line with one of the two loops, at a distance about the same as the distance between the two vertical portions of the loop.