(under subclass 700) Subject matter wherein the active antenna is constructed so that it may be changed into a
different species of active antenna as, for example, by switching means connecting the active portion or portions in a different arrangement to the source or load or by adding to or removing part of the radiating or collecting element.
(1) Note. For classification in this subclass the converting structure must produce a different active antenna having significantly different physical or electrical characteristics as opposed, for example, to adding sections to or adjusting the antenna to change its physical or electrical length, or adding or removing auxiliary structure (e.g., reflector).
(2) Note. In this subject matter the different antennas are not in physical existence at the same time, but exist alternately, as opposed to the subject matter of subclasses 729+ wherein plural diverse antenna exist simultaneously. Yet here, as in subclasses 729+, the different antennas employ a common active portion.
(3) Note. For classification here, the change may be from one type of active antenna to another such as from a center-fed balanced doublet to a capacity type antenna or from a loop to a trailing wire antenna; or the change may be from one species of antenna to another within a type, such as from a folded dipole to a simple rod dipole.
(4) Note. The rules recited under subclass 725 for determining when antennas are of different type are not applicable here.
SEE OR SEARCH THIS CLASS, SUBCLASS: 725+, for plural separate diverse type antennas. See (4) Note, above.
729+, for plural diverse type active antennas using the same active element. See also (2) Note, above.
794, for diverse type balanced center-fed doublet antennas.
832, for an active antenna which is also a reflector.
850+, for active antennas with a coupling network or impedance in the leadin, and particularly subclass 859 for balanced to unbalanced coupling.
876, for antennas with switching means between the antennas and lines.
