Download Some Spectral Characteristics of Cepheid Variables by Adams W. S., Joy A. H. PDF
By Adams W. S., Joy A. H.
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Extra info for Some Spectral Characteristics of Cepheid Variables (1918)(en)(4s)
Example text
The system is configured so that all of the energy from the visual transmitter passes to the antenna (port D), and all of the energy from the aural transmitter passes to the antenna. The phase relationships are arranged so that the input signals cancel at the resistive load (port B). Because of the paths taken by the aural and visual signals through the notch diplexer, the amplitude and phase characteristics of each input do not change from the input ports (port A for the visual and port C for the aural) and the antenna (port D), thus preserving signal purity.
Such antennas use circular apertures to form a pencil beam of about 1° in the X and Y coordinates. Operating frequencies in the S, C, and X bands are preferred because they allow a smaller aperture for the same transmitted beamwidth. The tracking antenna is physically smaller than most other types of comparable gain and directivity. This permits more accurate pointing at a given target. • Multifunction array: an electrically steered antenna used for both airborne and ground-based applications. An array antenna consists of individual radiating elements that are driven together to produce a plane wavefront in front of the antenna aperture.
Medium-range systems: useful for distances of 20 to 200 mi, are mainly employed in coastal areas and above populated land masses. • Short-range systems: useful for distances of less than 20 mi, are used for approach, docking, or landing applications. Electronic navigation systems can be further divided into cooperative or self-contained. Cooperative systems depend on transmission, one- or two-way, between one or more ground stations and the vehicle. Such systems are capable of providing the vehicle with a location fix, independent of its previous position.